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66 results on '"College of Computing (GATECH)"'

1. Transforming multiple visual surveys of a natural environment into time-lapses

Author

Shane Griffith, Cédric Pradalier, Frank Dellaert, Georgia Tech Lorraine [Metz], Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Georgia Institute of Technology [Atlanta]-CentraleSupélec-Ecole Nationale Supérieure des Arts et Metiers Metz-Centre National de la Recherche Scientifique (CNRS), College of Computing (GATECH), and Georgia Institute of Technology [Atlanta]

Subjects
0209 industrial biotechnology, data association, dense correspondence, time-lapse, visual SLAM, Applied Mathematics, Mechanical Engineering, [INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV], 020207 software engineering, 02 engineering and technology, Natural (archaeology), 020901 industrial engineering & automation, Variation (linguistics), Geography, visual survey, Artificial Intelligence, Data association, Modeling and Simulation, 0202 electrical engineering, electronic engineering, information engineering, [INFO.INFO-RB]Computer Science [cs]/Robotics [cs.RO], field robotics, Electrical and Electronic Engineering, Cartography, Software
Abstract

This article presents a new framework to help transform visual surveys of a natural environment into time-lapses. As data association across year-long variation in appearance continues to represent a formidable challenge, we present success with a map-centric approach, which builds on 3D vision for visual data association. We use a foundation of map point priors and geometric constraints within a dense correspondence image alignment optimization to align images and acquire loop closures between surveys. This framework produces many loop closures between sessions. Outlier loop closures are filtered in the frontend and in the backend to improve robustness. From the result map, the Reprojection Flow algorithm is applied to create time-lapses. The evaluation of our framework on the Symphony Lake Dataset, which has considerable variation in appearance, led to year-long time-lapses of many different scenes. In comparison with another approach based on using iterative closest point (ICP) plus a homography, our framework produced more and better-quality alignments. With many scenes of the 1.3 km environment consistently aligning well in random image pairs, we next produced 100 time-lapses across 37 surveys captured in a year. Approximately one-third had at least 20 (out of usually 33) well-aligned images, which spanned all four seasons. With promising results, we evaluated the pose error of misaligned image pairs and found that improving map consistency could lead to even better results.

Published
2019

2. Self-assembled nanostructures in ionic liquids facilitate charge storage at electrified interfaces

Author

Isabelle Grillo, Rob Atkin, Gavin Hazell, T. Alan Hatton, Xianwen Mao, Paul D. Brown, Julian Eastoe, Hua Li, Di Chen, Ctirad Červinka, Yinying Ren, Agilio A. H. Padua, Margarida F Costa Gomes, Department of Chemical Engineering (DCE-MIT), Massachusetts Institute of Technology (MIT), Department of Physical Chemistry, University of Chemistry and Technology, Prague, University of Chemistry and Technology Prague (UCT Prague), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], The University of Western Australia (UWA), University of Bristol [Bristol], Laboratoire de Chimie - UMR5182 (LC), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Institut de Chimie du CNRS (INC), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nanostructure, Materials science, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Ion, Molecular dynamics, chemistry.chemical_compound, symbols.namesake, Amphiphile, Molecular self-assembly, General Materials Science, Alkyl, ComputingMilieux_MISCELLANEOUS, chemistry.chemical_classification, energy transfer, Mechanical Engineering, molecular self-assembly, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, molecular dynamics, 0104 chemical sciences, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, electrochemistry, chemistry, Mechanics of Materials, Chemical physics, Ionic liquid, symbols, van der Waals force, 0210 nano-technology
Abstract

Driven by the potential applications of ionic liquids (ILs) in many emerging electrochemical technologies, recent research efforts have been directed at understanding the complex ion ordering in these systems, to uncover novel energy storage mechanisms at IL–electrode interfaces. Here, we discover that surface-active ILs (SAILs), which contain amphiphilic structures inducing self-assembly, exhibit enhanced charge storage performance at electrified surfaces. Unlike conventional non-amphiphilic ILs, for which ion distribution is dominated by Coulombic interactions, SAILs exhibit significant and competing van der Waals interactions owing to the non-polar surfactant tails, leading to unusual interfacial ion distributions. We reveal that, at an intermediate degree of electrode polarization, SAILs display optimum performance, because the low-charge-density alkyl tails are effectively excluded from the electrode surfaces, whereas the formation of non-polar domains along the surface suppresses undesired overscreening effects. This work represents a crucial step towards understanding the unique interfacial behaviour and electrochemical properties of amphiphilic liquid systems showing long-range ordering, and offers insights into the design principles for high-energy-density electrolytes based on spontaneous self-assembly behaviour. Understanding molecular interactions between ionic liquids and interfaces is crucial for electrochemical device applications. Self-assembled amphiphilic nanostructures in surface-active ionic liquids are shown to exhibit enhanced charge storage at electrified surfaces.

Published
2019

3. Epitaxial two-layer graphene under pressure: Diamene stiffer than Diamond

Author

Francesco Lavini, Filippo Cellini, Claire Berger, Elisa Riedo, Angelo Bongiorno, Tengfei Cao, Walt A. de Heer, Georgia Institute of Technology [Atlanta], Circuits électroniques quantiques Alpes (QuantECA ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), College of Computing (GATECH), and School of Physics

Subjects
Materials science, 02 engineering and technology, Chemical vapor deposition, engineering.material, 010402 general chemistry, Epitaxy, 01 natural sciences, law.invention, chemistry.chemical_compound, law, Materials Chemistry, Silicon carbide, Composite material, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Graphene, Diamond, Nanoindentation, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Carbon film, chemistry, Ceramics and Composites, Sapphire, engineering, 0210 nano-technology
Abstract

International audience; The unprecedented ultrahigh interlayer stiffness of supported two-layer epitaxial graphene on silicon carbide (SiC) has been recently reported by our research group. We found that under localized pressure a two-layer epitaxial graphene behaves as an ultra-hard and ultra-stiff coating, showing exceptional mechanical properties that far exceed those of bare SiC. Density functional theory (DFT) calculations indicate that this unique behavior stems from a sp 2-to-sp 3 reversible phase transition of carbon films under compression, leading to a single-layer diamond-like structure that we called diamene. In this paper, force versus indentation depth curves from high-resolution nanoindentation experiments of CVD diamond and sapphire are carried out and compared to those obtained from two-layer epitaxial graphene on SiC. These new measurements confirm that the stiffness of epitaxial graphene is larger than that exhibited by CVD diamond and sapphire substrates. Our measurements show that areas of the film consisting of buffer layer plus one, or at most two, additional graphene layers are the ones most likely to exhibit phase-changing behaviors and larger-than-diamond stiffness.

Published
2018

4. Ultrahard carbon film from epitaxial two-layer graphene

Author

Walt A. de Heer, Erio Tosatti, Tengfei Cao, Angelo Bongiorno, Yang Gao, Claire Berger, Filippo Cellini, Elisa Riedo, Circuits électroniques quantiques Alpes (QuantECA ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Georgia Institute of Technology [Atlanta], Scuola Internazionale Superiore di Studi Avanzati / International School for Advanced Studies (SISSA / ISAS), School of Physics, and College of Computing (GATECH)

Subjects
Materials science, Biomedical Engineering, FOS: Physical sciences, Bioengineering, 02 engineering and technology, engineering.material, 010402 general chemistry, Epitaxy, 01 natural sciences, law.invention, law, Electrical resistivity and conductivity, Indentation, General Materials Science, Electrical and Electronic Engineering, Composite material, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], Condensed Matter - Materials Science, Graphene, Bilayer, Drop (liquid), Materials Science (cond-mat.mtrl-sci), Diamond, Computational Physics (physics.comp-ph), 021001 nanoscience & nanotechnology, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, 0104 chemical sciences, Carbon film, engineering, 0210 nano-technology, Physics - Computational Physics
Abstract

Atomically thin graphene exhibits fascinating mechanical properties, although its hardness and transverse stiffness are inferior to those of diamond. To date, there hasn't been any practical demonstration of the transformation of multi-layer graphene into diamond-like ultra-hard structures. Here we show that at room temperature and after nano-indentation, two-layer graphene on SiC(0001) exhibits a transverse stiffness and hardness comparable to diamond, resisting to perforation with a diamond indenter, and showing a reversible drop in electrical conductivity upon indentation. Density functional theory calculations suggest that upon compression, the two-layer graphene film transforms into a diamond-like film, producing both elastic deformations and sp2-to-sp3 chemical changes. Experiments and calculations show that this reversible phase change is not observed for a single buffer layer on SiC or graphene films thicker than 3 to 5 layers. Indeed, calculations show that whereas in two-layer graphene layer-stacking configuration controls the conformation of the diamond-like film, in a multilayer film it hinders the phase transformation., Comment: Published online on Nature Nanotechnology on December 18, 2017

Published
2017

5. Using Ground Transportation for Aviation System Disruption Alleviation

Author

Eric Féron, Isabelle Laplace, Aude Marzuoli, Antony Evans, Lynnette Dray, University of Cambridge [UK] (CAM), Ecole Nationale de l'Aviation Civile (ENAC), Georgia Institute of Technology [Atlanta], College of Computing (GATECH), University College of London [London] (UCL), and 314453, Seventh Framework Programme

Subjects
0209 industrial biotechnology, Aviation system disruption recovery, Aviation, Aerospace Engineering, Transportation, 02 engineering and technology, Management, Monitoring, Policy and Law, Reduction (complexity), Transport engineering, 020901 industrial engineering & automation, Low-cost carrier, Management of Technology and Innovation, 0502 economics and business, 050210 logistics & transportation, Air traffic flow management, business.industry, 05 social sciences, Ground transportation, [SDE.ES]Environmental Sciences/Environmental and Society, Cost reduction, real-time intermodality, Global Positioning System, Business, Safety Research, collaborative decision making, Energy (miscellaneous)
Abstract

International audience; We investigate whether passenger delays and airline costs due to disruptive events affecting European airports could be reduced by a coordinated strategy of using alternative flights and ground transportation to help stranded passengers reach their final destination, using Airport Collaborative Decision Making concepts. Optimising for airline cost for hypothetical disruptive events suggests that, for airport closures of up to 10 hours, airlines could benefit from up to a 20% reduction in passenger delay-related costs. Mean passenger delay could be reduced by up to 70%, mainly via a reduction in very long delays.

Published
2017

6. Is Acyclic Directed Graph Partitioning Effective for Locality-Aware Scheduling?

Author

Özkaya, Yusuf, Benoit, Anne, Çatalyürek, Ümit, Georgia Institute of Technology [Atlanta], Optimisation des ressources : modèles, algorithmes et ordonnancement (ROMA), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de l'Informatique du Parallélisme (LIP), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Informatique du Parallélisme (LIP), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS), College of Computing (GATECH), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL)

Subjects
[INFO]Computer Science [cs], [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC]
Abstract

International audience; We investigate efficient execution of computations, modeled as Directed Acyclic Graphs (DAGs), on a single processor with a two-level memory hierarchy, where there is a limited fast memory and a larger slower memory. Our goal is to minimize execution time by minimizing redundant data movement between fast and slow memory. We utilize a DAG partitioner that finds localized, acyclic parts of the whole computation that can fit into fast memory, and minimizes the edge cut among the parts. We propose a new scheduler that executes each part one-by-one, obeying the dependency among parts, aiming at reducing redundant data movement needed by cut-edges. Extensive experimental evaluation shows that the proposed DAG-based scheduler significantly reduces redundant data movement.

Published
2019

7. Multilevel Algorithms for Acyclic Partitioning of Directed Acyclic Graphs

Author

Kamer Kaya, Ümit V. Çatalyürek, Bora Uçar, Julien Herrmann, M. Yusuf Özkaya, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Laboratoire de l'Informatique du Parallélisme (LIP), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS), Optimisation des ressources : modèles, algorithmes et ordonnancement (ROMA), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de l'Informatique du Parallélisme (LIP), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS), Faculty of Engineering and Natural Sciences (Sabanci University), Sabanci University [Istanbul], École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL)

Subjects
acyclic partitioning, Applied Mathematics, [INFO.INFO-DS]Computer Science [cs]/Data Structures and Algorithms [cs.DS], 68R10, 010103 numerical & computational mathematics, Directed graph, Directed acyclic graph, directed graph, 01 natural sciences, multilevel partitioning 20 AMS subject classifications 05C70, 68W05 21, Combinatorics, Computational Mathematics, 05C85, [INFO]Computer Science [cs], 0101 mathematics, Mathematics, MathematicsofComputing_DISCRETEMATHEMATICS
Abstract

International audience; We investigate the problem of partitioning the vertices of a directed acyclic graph into a given number of parts. The objective function is to minimize the number or the total weight of the edges having end points in different parts, which is also known as the edge cut. The standard load balancing constraint of having an equitable partition of the vertices among the parts should be met. Furthermore, the partition is required to be acyclic; i.e., the interpart edges between the vertices from different parts should preserve an acyclic dependency structure among the parts. In this work, we adopt the multilevel approach with coarsening, initial partitioning, and refinement phases for acyclic partitioning of directed acyclic graphs. We focus on two-way partitioning (sometimes called bisection), as this scheme can be used in a recursive way for multiway partitioning. To ensure the acyclicity of the partition at all times, we propose novel and efficient coarsening and refinement heuristics. The quality of the computed acyclic partitions is assessed by computing the edge cut. We also propose effective ways to use the standard undirected graph partitioning methods in our multilevel scheme. We perform a large set of experiments on a dataset consisting of (i) graphs coming from an application and (ii) some others corresponding to matrices from a public collection. We report significant improvements compared to the current state of the art.

Published
2019

8. Clinical Characteristics of Subependymal Giant Cell Astrocytoma in Tuberous Sclerosis Complex

Author

Karas, Antonina, Jiang, yuwu, Zou, Liping, Xu, Kaifeng, Zhang, yushi, Luan, Guoming, Zhang, yuqin, Wang, yi, Jin, Meiling, ye, Dingwei, Liao, Weiping, Zhou, Liemin, Liu, Jie, Liao, Jianxiang, yan, Bo, Deng, yanchun, Jiang, Li, Liu, Zhisheng, Huang, Shaoping, Li, Hua, Kim, Kijoong, Chen, Pei-Lung, Lee, Hsiu-Fen, Tsai, Jeng-Dau, Chi, Ching-Shiang, Huang, Chao-Ching, Riney, Kate, yates, Deborah, Kwan, Patrick, Likasitwattanakul, Surachai, Nabangchang, Charcrin, Chomtho, Lunliya Thampratankul Krisnachai, Katanyuwong, Kamornwan, Sriudomkajorn, Somjit, Wilmshurst, Jo, Segel, Reeval, Gilboa, Tal, Tzadok, Michal, Fattal-Valevski, Aviva, Papathanasopoulos, Panagiotis, Papavasiliou, Antigone Syrigou, Giannakodimos, Stylianos, Gatz, Stylianos, Pavlou, Evangelos, Tzoufi, Meropi, Vergeer, A. M. H., Dhooghe, Marc, Verhelst, Helene, Roelens, Filip, Nassogne, Marie Cecile, Defresne, Pierre, de Waele, Liesbeth, Leroy, Patricia, Demonceau, Nathalie, Legros, Benjamin, van Bogaert, Patrick, Ceulemans, Berten, Dom, Lina, Castelnau, Pierre, Martin, Anne de St, Riquet, Audrey, Milh, Mathieu, Cances, Claude, Pedespan, Jean-Michel, Ville, Dorothee, Roubertie, Agathe, Auvin, Stephane, Berquin, Patrick, Richelme, Christian, Allaire, Catherine, Gueden, Sophie, Tich, Sylvie Nguyen The, Godet, Bertrand, Rojas, Maria Luz Ruiz Falco, Planas, Jaume Campistol, Bermejo, Antonio Martinez, Dura, Patricia Smeyers, Aparicio, Susana Roldan, Gonzalez, Maria Jesus Martinez, Pison, Javier Lopez, Barca, Manuel Oscar Blanco, Laso, Eduardo Lopez, Luengo, Olga Alonso, Rodriguez, Francisco Javier Aguirre, Dieguez, Ignacio Malaga, Salas, Ana Camacho, Carrera, Itxaso Marti, Salcedo, Eduardo Martinez, Petri, Maria Eugenia yoldi, Candela, Ramon Cancho, Carrilho, Ines da Conceicao, Vieira, Jose Pedro, Monteiro, Jose Paulo da Silva Oliveira, Leao, Miguel Jorge Santos de Oliveira Ferreira, Luis, Catarina Sofia Marceano Ribeiro, Mendonca, Carla Pires, Endziniene, Milda, Strautmanis, Jurgis, Talvik, Inga, Canevini, Maria Paola, Gambardella, Antonio, Pruna, Dario, Buono, Salvatore, Fontana, Elena, Dalla Bernardina, Bernardo, Burloiu, Carmen, Cosma, Iuliu Stefan Bacos, Vintan, Mihaela Adela, Popescu, Laura, Zitterbart, Karel, Payerova, Jaroslava, Bratsky, Ladislav, Zilinska, Zuzana, Gruber-Sedlmayr, Ursula, Baumann, Matthias, Haberland, Edda, Rostasy, Kevin, Pataraia, Ekaterina, Elmslie, Frances, Johnston, Clare Ann, Crawford, Pamela, Uldall, Peter, Uvebrant, Paul, Rask, Olof, Bjoernvold, Marit, Brodtkorb, Eylert, Sloerdahl, Andreas, Solhoff, Ragnar, Jaatun, Martine Sofie Gilje, Mandera, Marek, Radzikowska, Elzbieta Janina, Wysocki, Mariusz, Fischereder, Michael, Kurlemann, Gerhard, Wilken, Bernd, Wiemer-Kruel, Adelheid, Budde, Klemens, Marquard, Klaus, Knuf, Markus, Hahn, Andreas, Hartmann, Hans, Merkenschlager, Andreas, Trollmann, Regina, Jansen, Anna C., Belousova, Elena, Benedik, Mirjana P., Carter, Tom, Cottin, Vincent, Curatolo, Paolo, Dahlin, Maria, d'Amato, Lisa, d'Augeres, Guillaume Beaure, Vries, Petrus J., Ferreira, Jose C., Feucht, Martha, Fladrowski, Carla, Hertzberg, Christoph, Jozwiak, Sergiusz, Lawson, John A., Macaya, Alfons, Marques, Ruben, Nabbout, Rima, O'Callaghan, Finbar, Qin, Jiong, Sander, Valentin, Sauter, Matthias, Shah, Seema, Takahashi, yukitoshi, Touraine, Renaud, youroukos, Sotiris, Zonnenberg, Bernard, Kingswood, John C., Shinohara, Nobuo, Horie, Shigeo, Kubota, Masaya, Tohyama, Jun, Imai, Katsumi, Kaneda, Mari, Kaneko, Hideo, Uchida, yasushi, Kirino, Tomoko, Endo, Shoichi, Inoue, yoshikazu, Uruno, Katsuhisa, Serdaroglu, Ayse, yapici, Zuhal, Anlar, Banu, Altunbasak, Sakir, Lvova, Olga, Belyaev, Oleg Valeryevich, Agranovich, Oleg, Levitina, Elena Vladislavovna, Maksimova, yulia Vladimirovna, Johns Hopkins University (JHU), Fudan University [Shanghai], EED, University of California [Los Angeles] (UCLA), University of California-University of California, Chimie pour la Reconnaissance et l’Etude d’Assemblages Biologiques (CREAB), SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé (SYMMES), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Interfaces pour l'énergie, la Santé et l'Environnement (DIESE), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Institute for Human Genetics, Safra Children's Hospital, Department of Neurology, University Hospital Patras, University Hospitals Leuven [Leuven], CHU de Liège, Laboratoire Angevin de Recherche en Ingénierie des Systèmes (LARIS), Université d'Angers (UA), University of Antwerp (UA), Imagerie et cerveau (iBrain - Inserm U1253 - UNIV Tours ), Université de Tours (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre Hospitalier Régional Universitaire de Tours (CHRU Tours), Service de Neuro-pédiatrie[Lille], Hôpital Jeanne de Flandre [Lille]-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), Marseille medical genetics - Centre de génétique médicale de Marseille (MMG), Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Département de Pédiatrie [CHU Toulouse], CHU Toulouse [Toulouse], Service de neurologie pédiatrique [CHU de Bordeaux], CHU de Bordeaux Pellegrin [Bordeaux], Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Neuroprotection du Cerveau en Développement / Promoting Research Oriented Towards Early Cns Therapies (PROTECT), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Hôpital Robert Debré-Université Paris Diderot - Paris 7 (UPD7)-Institut National de la Santé et de la Recherche Médicale (INSERM), AP-HP Hôpital universitaire Robert-Debré [Paris], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Groupe de Recherche sur l'Analyse Multimodale de la Fonction Cérébrale - UMR INSERM_S 1105 (GRAMFC), Université de Picardie Jules Verne (UPJV)-CHU Amiens-Picardie-Institut National de la Santé et de la Recherche Médicale (INSERM), Service de pédiatrie, Centre Hospitalier Universitaire de Nice (CHU Nice)-Hôpital l'Archet, Centre de recherche en Myologie – U974 SU-INSERM, Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU), Service de Neurologie [Chateaulin], Centre Toul-arC'hoat, Centre Hospitalier Universitaire d'Angers (CHU Angers), PRES Université Nantes Angers Le Mans (UNAM), Service de Neurologie [CHU Limoges], CHU Limoges, Lithuanian University of Health Sciences [Kaunas, Lithuania], Regional Epilepsy Center, Reggio Calabria, Innsbruck Medical University [Austria] (IMU), Witten/Herdecke University, St. George's Hospital, Danish Epilepsy Centre, Denmark and Aarhus University, Aarhus, Department of Pediatric Hematology and Oncology, Collegium Medicum, Nicolaus Copernicus University [Toruń], Charité - UniversitätsMedizin = Charité - University Hospital [Berlin], Moscow Regional Research Clinical Institute (MONICA), Infections Virales et Pathologie Comparée - UMR 754 (IVPC), Institut National de la Recherche Agronomique (INRA)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Universitat Autònoma de Barcelona (UAB), CHU Necker - Enfants Malades [AP-HP], Imagine - Institut des maladies génétiques (IHU) (Imagine - U1163), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris Cité (UPC), Service de Génétique Clinique Chromosomique et Moléculaire, CHU Saint-Etienne-Hôpital Nord - Saint-Etienne, Department of Clinical Genetics, Physiotherapy, Human Physiology and Anatomy, Pediatrics, Public Health Sciences, Mental Health and Wellbeing research group, Neurogenetics, De Waele, L, University of California (UC)-University of California (UC), UMR 1253 IBrain Imagerie & Cerveau Equipe 3 'Imagerie, Biomarqueurs & Thérapie' (IBT), Université de Tours (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Tours (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM), Pôle Enfants [CHU Toulouse], Centre Hospitalier Universitaire de Toulouse (CHU Toulouse), Innsbruck Medical University = Medizinische Universität Innsbruck (IMU), Institut National de la Recherche Agronomique (INRA)-École Pratique des Hautes Études (EPHE), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris Cité (UPCité), Centre Hospitalier Universitaire de Saint-Etienne [CHU Saint-Etienne] (CHU ST-E), [Jansen AC] Pediatric Neurology Unit, Department of Pediatrics, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium. [Belousova E] Research and Clinical Institute of Pediatrics, Pirogov Russian National Research Medical University, Moscow, Russia. [Benedik MP] Child Neurology Department, SPS Pediatriêna Klinika, Ljubljana, Slovenia. [Carter T] Tuberous Sclerosis Association, Nottingham, United Kingdom. [Cottin V] Hôpital Louis Pradel, Claude Bernard University Lyon 1, Lyon, France. [Curatolo P] Child Neurology and Psychiatry Unit, Systems Medicine Department, Tor Vergata University Hospital, Rome, Italy. [Macaya A] Neurologia pediàtrica, Hospital Universitari Vall d’Hebron, Barcelona, Spain., and Vall d'Hebron Barcelona Hospital Campus

Subjects
Quinases, Pediatrics, enzimas y coenzimas::enzimas::transferasas::fosfotransferasas::fosfotransferasas (grupo alcohol aceptor)::proteína cinasas::proteína-serina-treonina cinasas::TOR serina-treonina cinasas [COMPUESTOS QUÍMICOS Y DROGAS], Angiomyolipoma, Neurology, [SDV]Life Sciences [q-bio], CHILDREN, tuberous sclerosis complex, registry, Neoplasms::Neoplasms by Histologic Type::Neoplasms::Neoplasms by Histologic Type::Neoplasms, Glandular and Epithelial::Neoplasms, Neuroepithelial::Glioma::Neoplasms::Neoplasms by Histologic Type::Astrocytoma [DISEASES], SEGA, RECOMMENDATIONS, DISEASE, lcsh:RC346-429, Tuberous sclerosis, DOUBLE-BLIND, 0302 clinical medicine, EVEROLIMUS, neoplasias::hamartoma::esclerosis tuberosa [ENFERMEDADES], Medicine and Health Sciences, 030212 general & internal medicine, Original Research, Intracranial pressure, Esclerosi tuberosa, 3. Good health, medicine.anatomical_structure, mTOR, Astrocitomes, Life Sciences & Biomedicine, medicine.drug, medicine.medical_specialty, Clinical Neurology, DIAGNOSIS, 03 medical and health sciences, medicine, MANAGEMENT, TOSCA, lcsh:Neurology. Diseases of the nervous system, Everolimus, Science & Technology, Subependymal giant cell astrocytoma, business.industry, ANGIOMYOLIPOMA, neoplasias::neoplasias por tipo histológico::neoplasias::neoplasias por tipo histológico::neoplasias glandulares y epiteliales::neoplasias neuroepiteliales::glioma::neoplasias::neoplasias por tipo histológico::astrocitoma [ENFERMEDADES], Neurosciences, medicine.disease, SEVERITY, Enzymes and Coenzymes::Enzymes::Transferases::Phosphotransferases::Phosphotransferases (Alcohol Group Acceptor)::Protein Kinases::Protein-Serine-Threonine Kinases::TOR Serine-Threonine Kinases [CHEMICALS AND DRUGS], Neurology (clinical), TSC1, Neurosciences & Neurology, TSC2, business, 030217 neurology & neurosurgery, Neoplasms::Hamartoma::Tuberous Sclerosis [DISEASES]
Abstract

SEGA; TOSCA; Tuberous sclerosis complex SEGA; TOSCA; Complejo de esclerosis tuberosa SEGA; TOSCA; Complex d'esclerosi tuberosa Background: This study evaluated the characteristics of subependymal giant cell astrocytoma (SEGA) in patients with tuberous sclerosis complex (TSC) entered into the TuberOus SClerosis registry to increase disease Awareness (TOSCA). Methods: The study was conducted at 170 sites across 31 countries. Data from patients of any age with a documented clinical visit for TSC in the 12 months preceding enrollment or those newly diagnosed with TSC were entered. Results: SEGA were reported in 554 of 2,216 patients (25%). Median age at diagnosis of SEGA was 8 years (range, 18 years. SEGA were symptomatic in 42.1% of patients. Symptoms included increased seizure frequency (15.8%), behavioural disturbance (11.9%), and regression/loss of cognitive skills (9.9%), in addition to those typically associated with increased intracranial pressure. SEGA were significantly more frequent in patients with TSC2 compared to TSC1 variants (33.7 vs. 13.2 %, p < 0.0001). Main treatment modalities included surgery (59.6%) and mammalian target of rapamycin (mTOR) inhibitors (49%). Conclusions: Although SEGA diagnosis and growth typically occurs during childhood, SEGA can occur and grow in both infants and adults. The study was funded by Novartis Pharma AG. Novartis has contributed to the study design, data analysis, and the decision to publish. Novartis authors reviewed the draft for submission.

Published
2019

9. Efficient and effective sparse tensor reordering

Author

Jiajia Li, Jimeng Sun, Ümit V. Çatalyürek, Kevin J. Barker, Bora Uçar, Richard Vuduc, Pacific Northwest National Laboratory (PNNL), Laboratoire de l'Informatique du Parallélisme (LIP), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS), Optimisation des ressources : modèles, algorithmes et ordonnancement (ROMA), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de l'Informatique du Parallélisme (LIP), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL)

Subjects
020203 distributed computing, Multi-core processor, Speedup, Computer science, Computation, [INFO.INFO-DS]Computer Science [cs]/Data Structures and Algorithms [cs.DS], Breadth-first search, 02 engineering and technology, HiCOO, Sparse tensor, Scheduling (computing), reordering, tensor decomposition, 0202 electrical engineering, electronic engineering, information engineering, Locality of reference, Tensor decomposition, [INFO]Computer Science [cs], 020201 artificial intelligence & image processing, Tensor, [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], hierarchical coor- dinate, Algorithm
Abstract

International audience; This paper formalizes the problem of reordering a sparse tensor to improve the spatial and temporal locality of operations with it, and proposes two reordering algorithms for this problem, which we call BFS-MCS and Lexi-Order. The BFS-MCS method is a Breadth First Search (BFS)-like heuristic approach based on the maximum cardinality search family; Lexi-Order is an extension of doubly lexical ordering of matrices to tensors. We show the effects of these schemes within the context of a widely used tensor computation, the CANDECOMP/PARAFAC decomposition (CPD), when storing the tensor in three previously proposed sparse tensor formats: coordinate (COO), compressed sparse fiber (CSF), and hierarchical coordinate (HiCOO). A new partition-based superblock scheduling is also proposed for HiCOO format to improve load balance. On modern multicore CPUs, we show Lexi-Order obtains up to 4.14× speedup on sequential HiCOO-Mttkrp and 11.88× speedup on its parallel counterpart. The performance of COO-and CSF-based Mttkrps also improves. Our two reordering methods are more effective than state-of-the-art approaches. The code is released as part of Parallel Tensor Infrastructure (ParTI!): https://github.com/hpcgarage/ParTI.

Published
2019

10. SINA: A Scalable Iterative Network Aligner

Author

Abdurrahman Yasar, Bora Uçar, Ümit V. Çatalyürek, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Optimisation des ressources : modèles, algorithmes et ordonnancement (ROMA), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de l'Informatique du Parallélisme (LIP), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Informatique du Parallélisme (LIP), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS), Roma, Equipe, École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL)

Subjects
0301 basic medicine, Theoretical computer science, Speedup, Computer science, [INFO] Computer Science [cs], [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM], Execution time, Vertex (geometry), [INFO.INFO-DM] Computer Science [cs]/Discrete Mathematics [cs.DM], 03 medical and health sciences, 030104 developmental biology, Shared memory, Scalability, [INFO.INFO-DC] Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], Graph alignment, Network alignment, [INFO]Computer Science [cs], [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], Global structure, MathematicsofComputing_DISCRETEMATHEMATICS
Abstract

International audience; Given two graphs, network alignment asks for a potentially partial mapping between the vertices of the two graphs. This arises in many applications where data from different sources need to be integrated. Recent graph aligners use the global structure of input graphs and additional information given for the edges and vertices. We present SINA, an efficient, shared memory parallel implementation of such an aligner. Our experimental evaluations on a 32-core shared memory machine showed that SINA scales well for aligning large real-world graphs: SINA can achieve up to 28.5× speedup, and can reduce the total execution time of a graph alignment problem with 2M vertices and 100M edges from 4.5 hours to under 10 minutes. To the best of our knowledge, SINA is the first parallel aligner that uses global structure and vertex and edge attributes to handle large graphs.

Published
2018

11. Un ordonnanceur de liste basé sur le partitionnement de DAGs pour des processeurs homogènes

Author

Bora Uçar, Anne Benoit, Ümit V. Çatalyürek, Julien Herrmann, M. Yusuf Özkaya, Georgia Institute of Technology [Atlanta], Optimisation des ressources : modèles, algorithmes et ordonnancement (ROMA), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de l'Informatique du Parallélisme (LIP), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Inria Grenoble Rhône-Alpes, College of Computing (GATECH), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL)

Subjects
Theoretical computer science, Computer science, List scheduling, [INFO.INFO-DS]Computer Science [cs]/Data Structures and Algorithms [cs.DS], 010103 numerical & computational mathematics, 02 engineering and technology, 01 natural sciences, Clustering, Scheduling (computing), Concurrency, 0202 electrical engineering, electronic engineering, information engineering, 0101 mathematics, Cluster analysis, Index Terms-List scheduling, 020203 distributed computing, Job shop scheduling, Locality, Partitionnement, Localité des données, Concurrence, Load balancing (computing), Directed acyclic graph, Graph, Directed acyclic graphs, Scalability, Graph (abstract data type), Data locality, Graphes dirigés acycliques, [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], Heuristics, Partitioning, Ordonnancement de liste
Abstract

When scheduling a directed acyclic graph (DAG) of tasks on computationalplatforms, a good trade-off between load balance and data locality isnecessary. List-based scheduling techniques are commonly used greedy approachesfor this problem. The downside of list-scheduling heuristicsis that they are incapable of making short-term sacrifices for the globalefficiency of the schedule. In this work, we describe newlist-based scheduling heuristics based on clustering for homogeneousplatforms, under the realistic duplex single-port communication model. Our approach uses an acyclic partitioner for DAGs for clustering.The clustering enhances the data locality of the scheduler with a global viewof the graph. Furthermore, since the partition is acyclic, we can scheduleeach part completely once its input tasks are ready to be executed. Wepresent an extensive experimental evaluation showing the trade-offs betweenthe granularity of clustering and the parallelism, and how this affects the scheduling.Furthermore, we compare our heuristics to the best state-of-the-art list-scheduling and clustering heuristics, and obtain more than three times better makespan in caseswith many communications.; Lors de l'ordonnancement d'un graphe dirigé acyclique (DAG) de tâches sur une plate-forme, un bon compromis entre équilibrage de charge et localité des données est nécessaire.Les techniques d'ordonnancement de liste sont des approches gloutonnescommunément utilisées pour ce problème. Les inconvénients de telles heuristiques de liste sont qu'ellessont incapables de faire des sacrifices à court terme pour que l'ordonnancementglobal soit plus efficace. Dans ces travaux, nous décrivons de nouvelles heuristiques d'ordonnancement de listepour des plates-formes homogènes, avec un modèle de communications duplexe un-port réaliste. Notre approche se base sur un partitionnement acycliquedu DAG, car les parties ainsi formées permettent d'avoir une bonne localité des donnéestout en conservant une vue générale du graphe. De plus, étant donné que la partition est acyclique,nous pouvons ordonnancer chaque partie entièrement une fois que ses tâches d'entrée sont prêtes à être exécutées. Nous présentons une évaluation expérimentale des algorithmes pour montrerles compromis entre la granularité des partitions et le parallélisme, et commentcela affecte l'ordonnancement. De plus, nous comparons nos heuristiques aux meilleurscompétiteurs de la littérature, et nous obtenons un temps d’exécution total plus de trois fois meilleur dans des cas avec de nombreuses communications.

Published
2018

12. Combining Checkpointing and Replication for Reliable Execution of Linear Workflows

Author

Benoit, Anne, Cavelan, Aurélien, Ciorba, Florina, Le Fèvre, Valentin, Robert, Yves, Laboratoire de l'Informatique du Parallélisme (LIP), Centre National de la Recherche Scientifique (CNRS)-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École normale supérieure - Lyon (ENS Lyon), Optimisation des ressources : modèles, algorithmes et ordonnancement (ROMA), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de l'Informatique du Parallélisme (LIP), Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Centre National de la Recherche Scientifique (CNRS)-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], University of Basel (Unibas), Innovative Computing Laboratory [Knoxville] (ICL), The University of Tennessee [Knoxville], and Inria - Research Centre Grenoble – Rhône-Alpes

Subjects
work flow, linear chain of tasks, checkpoint, fail-stop error, chaîne de tâches, erreur fatale, [INFO]Computer Science [cs], réplication
Abstract

This report combines checkpointing and replication for the reliable executionof linear workows. While both methods have been studied separately, their combinationhas not yet been investigated despite its promising potential to minimize the execution timeof linear workows in failure-prone environments. The combination raises new problems:for each task, we have to decide whether to checkpoint and/or replicate it. We provide anoptimal dynamic programming algorithm of quadratic complexity to solve both problems.This dynamic programming algorithm has been validated through extensive simulationsthat reveal the conditions in which checkpointing only, replication only, or the combinationof both techniques lead to improved performance.; Ce rapport étudie la combinaison des techniques de checkpoint et de réplication pour l'exécution efficace et sûre de chaînes de tâches sur des plates-formes à grande échelle en présence d'erreurs fatales. . Ces deux techniques ont été étudiées séparément mais leur combinaison ouvre de nouvelles perspectives pour la minimisation du temps d'exécution dans des environnements sujets aux fautes. Pour chaque tâche, on doit décider s'il faut la checkpointer et /ou s'il faut la répliquer. Nous proposons un algorithme de programmation dynamique de complexité quadratique en le nombre detâches pour résoudre le problème, et montrons expérimentalement, via un jeu complet de simulations, dans quelles conditions les deux techniques, prises séparément ou combinées, peuvent améliorer les performances.

Published
2018

13. Combinaison des techniques de checkpoint et de réplication pour l'exécution efficace de chaînes de tâches

Author

Florina M. Ciorba, Aurélien Cavelan, Anne Benoit, Yves Robert, Valentin Le Fèvre, Laboratoire de l'Informatique du Parallélisme (LIP), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS), Optimisation des ressources : modèles, algorithmes et ordonnancement (ROMA), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de l'Informatique du Parallélisme (LIP), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], University of Basel (Unibas), Innovative Computing Laboratory [Knoxville] (ICL), The University of Tennessee [Knoxville], Inria - Research Centre Grenoble – Rhône-Alpes, École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Department of Computer Science (University of Basel)

Subjects
work flow, linear chain of tasks, Computer science, Distributed computing, Reliability (computer networking), 020206 networking & telecommunications, 02 engineering and technology, Replicate, Execution time, Replication (computing), 020202 computer hardware & architecture, Dynamic programming, Task (computing), Workflow, checkpoint, fail-stop error, chaîne de tâches, 0202 electrical engineering, electronic engineering, information engineering, Task analysis, erreur fatale, [INFO]Computer Science [cs], [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], réplication
Abstract

This report combines checkpointing and replication for the reliable executionof linear workows. While both methods have been studied separately, their combinationhas not yet been investigated despite its promising potential to minimize the execution timeof linear workows in failure-prone environments. The combination raises new problems:for each task, we have to decide whether to checkpoint and/or replicate it. We provide anoptimal dynamic programming algorithm of quadratic complexity to solve both problems.This dynamic programming algorithm has been validated through extensive simulationsthat reveal the conditions in which checkpointing only, replication only, or the combinationof both techniques lead to improved performance.; Ce rapport étudie la combinaison des techniques de checkpoint et de réplication pour l'exécution efficace et sûre de chaînes de tâches sur des plates-formes à grande échelle en présence d'erreurs fatales. . Ces deux techniques ont été étudiées séparément mais leur combinaison ouvre de nouvelles perspectives pour la minimisation du temps d'exécution dans des environnements sujets aux fautes. Pour chaque tâche, on doit décider s'il faut la checkpointer et /ou s'il faut la répliquer. Nous proposons un algorithme de programmation dynamique de complexité quadratique en le nombre detâches pour résoudre le problème, et montrons expérimentalement, via un jeu complet de simulations, dans quelles conditions les deux techniques, prises séparément ou combinées, peuvent améliorer les performances.

Published
2018

14. Experiments in verification of linear model predictive control: automatic generation and formal verification of an interior point method algorithm

Author

Didier Henrion, Guillaume Davy, Eric Feron, Pierre-Loïc Garoche, ONERA, Laboratoire d'analyse et d'architecture des systèmes (LAAS), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UPS), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse 1 Capitole (UT1)-Université Toulouse - Jean Jaurès (UT2J), Georgia Institute of Technology (USA), ONERA, Université de Toulouse [Toulouse], ONERA-PRES Université de Toulouse, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Équipe Méthodes et Algorithmes en Commande (LAAS-MAC), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, ANR-17-CE25-0018,FEANICSES,Analyses formelles et exhaustives de systèmes embarqués de contrôle à base de calculs intensifs(2017), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Laboratoire d'Analyse et d'Architecture des Systèmes - LAAS (Toulouse, France), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse 1 Capitole (UT1)-Université Toulouse - Jean Jaurès (UT2J)-Institut National Polytechnique (Toulouse) (Toulouse INP), and ANR: FEANICSES,Formal and Exhaustive Analysis of Numerical Intensive Control Software for Embedded Systems

Subjects
FOS: Computer and information sciences, Computer Science - Logic in Computer Science, 0209 industrial biotechnology, Computer science, 02 engineering and technology, Systems and Control (eess.SY), Numerical Software Verification, Formal proof, 020901 industrial engineering & automation, Program analysis, 0202 electrical engineering, electronic engineering, information engineering, [INFO.INFO-SY]Computer Science [cs]/Systems and Control [cs.SY], FOS: Electrical engineering, electronic engineering, information engineering, Interior point method, Code generation, Formal verification, Model Predictive Control, Satisfiability Modulo Theory, 020208 electrical & electronic engineering, [INFO.INFO-LO]Computer Science [cs]/Logic in Computer Science [cs.LO], [INFO.INFO-RO]Computer Science [cs]/Operations Research [cs.RO], Optimal control, Logic in Computer Science (cs.LO), Convex optimization, Model predictive control, Computer Science - Systems and Control, Algorithm, Recherche opérationnelle
Abstract

Classical control of cyber-physical systems used to rely on basic linear controllers. These controllers provided a safe and robust behavior but lack the ability to perform more complex controls such as aggressive maneuvering or performing fuel-efficient controls. Another approach called optimal control is capable of computing such difficult trajectories but lacks the ability to adapt to dynamic changes in the environment. In both cases, the control was designed offline, relying on more or less complex algorithms to find the appropriate parameters. More recent kinds of approaches such as Linear Model-Predictive Control (MPC) rely on the online use of convex optimization to compute the best control at each sample time. In these settings optimization algorithms are specialized for the specific control problem and embed on the device.This paper proposes to revisit the code generation of an interior point method (IPM) algorithm, an efficient family of convex optimization, focusing on the proof of its implementation at code level. Our approach relies on the code specialization phase to produce additional annotations formalizing the intended specification of the algorithm. Deductive methods are then used to prove automatically the validity of these assertions. Since the algorithm is complex, additional lemmas are also produced, allowing the complete proof to be checked by SMT solvers only.This work is the first to address the effective formal proof of an IPM algorithm. The approach could also be generalized more systematically to code generation frameworks, producing proof certificate along the code, for numerical intensive software.

Published
2018

15. Unambiguous real-time terahertz frequency metrology using dual 10 GHz femtosecond frequency combs

Author

Kliebisch, Oliver, Heinecke, Dirk, Barbieri, Stefano, Santarelli, Giorgio, Li, Hua, Sirtori, Carlo, Dekorsy, Thomas, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Photonique THz - IEMN (PHOTONIQ THz - IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Systèmes de Référence Temps Espace (SYRTE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Department of Physics and Center of Applied Photonics, University of Konstanz, German Aerospace Center (DLR), Spacetech GmbH, Photonique THz - IEMN (PHOTONIQUE THz - IEMN), Acknowledgment. Oliver Kliebisch thanks the Carl-ZeissStiftung (Stuttgart, Germany) for financial support. We thank Patricia Scheel and Arne Budweg for regular support with the operation of the cryogenic equipment., Funding. Carl-Zeiss-Stiftung, Deutsche Forschungsgemeinschaft (DFG)., and PSL Research University (PSL)-PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Titan:Saphir-Laser, THz-Strahlung, Femtosekundenlaser, Quantenkaskadenlaser, Hochrepetitionsratenlaser, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Physics::Optics, Spektroskopie, Frequenzmetrologie, Festkörperlaser und Nichtlineare Optik, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; Terahertz frequency metrology by radio frequency downconversion using femtosecond optical sampling relies on the harmonic factor retrieval between the terahertz frequency and the optical sampling rate. At typical femtosecond laser repetition rates, this imposes an ambiguity for frequency metrology. We report on a dual-comb sampling system for the unambiguous frequency measurement of terahertz quantum cascade lasers with hertz-level precision. Two Ti:sapphire oscillators with 10 GHz repetition rate are used for the electro-optic sampling of terahertz radiation at 2.5 THz emitted by actively mode-locked terahertz quantum cascade lasers with 9.7 GHz and 19.6 GHz repetition rates. By coherent downconversion, the emitted terahertz waveforms are measured in the radio frequency domain. The terahertz frequency comb is stabilized by employing a phase-locked loop on a radio frequency beat-note signal. A second infrared sampling comb is used to measure the absolute frequencies of the terahertz radiation. This method, which is based on the detuning of the sampling repetition rates, allows the direct retrieval of the quantum cascade laser’s absolute frequency in real time without using additional optical frequency references for calibration. In order to demonstrate the feasibility of the stabilization and readout technique, a high-resolution spectroscopy measurement on gaseous methanol is presented.

Published
2018

16. 2017 IEEE International Conference on Cluster Computing (CLUSTER)

Author

Maruyama, Naoya, Gamblin, Todd, Antoniu, Gabriel, Vuduc, Richard, Tokyo Institute of Technology [Tokyo] (TITECH), Lawrence Livermore National Laboratory (LLNL), Scalable Storage for Clouds and Beyond (KerData), Inria Rennes – Bretagne Atlantique, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-SYSTÈMES LARGE ÉCHELLE (IRISA-D1), Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), CentraleSupélec-Télécom Bretagne-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National de Recherche en Informatique et en Automatique (Inria)-École normale supérieure - Rennes (ENS Rennes)-Université de Bretagne Sud (UBS)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Télécom Bretagne-Université de Rennes 1 (UR1), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-École normale supérieure - Rennes (ENS Rennes)-Université de Bretagne Sud (UBS)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Institut National de Recherche en Informatique et en Automatique (Inria)-Télécom Bretagne-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Institut National de Recherche en Informatique et en Automatique (Inria)-Télécom Bretagne-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Télécom Bretagne-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)

Subjects
[INFO.INFO-PL]Computer Science [cs]/Programming Languages [cs.PL], [INFO.INFO-DS]Computer Science [cs]/Data Structures and Algorithms [cs.DS], [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

17. Response of Stock Returns to Oil Price Shocks: Evidence from Oil Importing and Exporting Countries

Author

Muhammad Shahbaz, Refk Selmi, Syed Jawad Hussain Shahzad, Jamal Bouoiyour, Centre d'Analyse Théorique et de Traitement des données économiques (CATT), Université de Pau et des Pays de l'Adour (UPPA), College of Computing (GATECH), and Georgia Institute of Technology [Atlanta]

Subjects
Macroeconomics, 020209 energy, 05 social sciences, 02 engineering and technology, Monetary economics, Oil-storage trade, [SHS.ECO]Humanities and Social Sciences/Economics and Finance, 01 natural sciences, Quantile regression, 010305 fluids & plasmas, Oil reserves, 8. Economic growth, 0502 economics and business, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Economics, Stock market, 050211 marketing, Arbitrage, Speculation, General Economics, Econometrics and Finance, Stock (geology), ComputingMilieux_MISCELLANEOUS, Quantile
Abstract

This paper examines the entire dependence structure of the quantile of stock return and that of oil price shocks, thereby extending the Quantile Regression to a Quantile-on- Quantile Regression. Based on historical monthly data covering the period April 1994~September 2015, it was shown that there is substantial heterogeneity in the stock returns and oil price relationship across oil importing countries and oil exporting countries. We find that the stocks of oil exporters that possess large proven oil reserves, in particular,Venezuela, Russia, and Saudi Arabia are typically more responsive toward demand-side oil shocks than those of oil importers. The intensity and the extent of these responses differ depending on the different stock market conditions and the nuances of oil price movements. profitable speculation and arbitrage strategies can be built.

Published
2017

18. Economic growth, electricity consumption, urbanization and environmental degradation relationship in United Arab Emirates

Author

Helmi Hamdi, Rashid Sbia, Muhammad Shahbaz, Ilhan Ozturk, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Centre d'Études et de Recherche en Gestion d'Aix-Marseille (CERGAM), Aix Marseille Université (AMU)-Université de Toulon (UTLN), Meslek Yüksekokulu, Ozturk, Ilhan -- 0000-0002-6521-0901, and Sbia, Rashid -- 0000-0003-2277-0455

Subjects
Consumption (economics), Ecology, Cointegration, Natural resource economics, business.industry, Urbanization, 1. No poverty, General Decision Sciences, Growth, Per capita income, [SHS.ECO]Humanities and Social Sciences/Economics and Finance, 7. Clean energy, Granger causality, 13. Climate action, 8. Economic growth, Economics, Electricity Consumption, Electricity, business, Environmental degradation, CO2 Emissions, ComputingMilieux_MISCELLANEOUS, Ecology, Evolution, Behavior and Systematics, Environmental quality
Abstract

WOS: 000340312100067, The present study explores the relationship between economic growth, electricity consumption, urbanization and environmental degradation in case of United Arab Emirates (UAE). The study covers the quarter frequency data over the period of 1975-2011. We have applied the ARDL bounds testing approach to examine the long run relationship between the variables in the presence of structural breaks. The VECM Granger causality is applied to investigate the direction of causal relationship between the variables. Our empirical exercise reported the existence of cointegration among the series. Further, we found an inverted U-shaped relationship between economic growth and CO2 emissions i.e. economic growth raises energy emissions initially and declines it after a threshold point of income per capita (EKC exists). Electricity consumption declines CO2 emissions. The relationship between urbanization and CO2 emissions is positive. Exports seem to improve the environmental quality by lowering CO2 emissions. The causality analysis validates the feedback effect between CO2 emissions and electricity consumption. Economic growth and urbanization Granger cause CO2 emissions

Published
2014

19. A contribution of foreign direct investment, clean energy, trade openness, carbon emissions and economic growth to energy demand in UAE

Author

Muhammad Shahbaz, Helmi Hamdi, Rashid Sbia, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Centre d'Études et de Recherche en Gestion d'Aix-Marseille (CERGAM), and Aix Marseille Université (AMU)-Université de Toulon (UTLN)

Subjects
Macroeconomics, Economics and Econometrics, Cointegration, Clean Energy, FDI, Emissions, Trade, Income, Energy consumption, Foreign direct investment, [SHS.ECO]Humanities and Social Sciences/Economics and Finance, 7. Clean energy, Unit (housing), Granger causality, Greenhouse gas, Clean energy, jel:E1, 8. Economic growth, Economics, Openness to experience, ComputingMilieux_MISCELLANEOUS
Abstract

This paper investigates the relationship between foreign direct investment, clean energy, trade openness, carbon emissions and economic growth in case of UAE covering the period of 1975Q1–2011Q4. We have tested the unit properties of variables in the presence of structural breaks. The ARDL bounds testing approach is applied to examine the cointegration by accommodating structural breaks stemming in the series. The VECM Granger causality approach is also applied to investigate the causal relationship between the variables. Our empirical findings confirm the existence of cointegration between the series. We find that foreign direct investment, trade openness and carbon emissions decline energy demand. Economic growth and clean energy have positive impact on energy consumption.

Published
2014

20. Energy consumption, financial development and economic growth in India: New evidence from a nonlinear and asymmetric analysis

Author

David Roubaud, Thi Hong Van Hoang, Mantu Kumar Mahalik, Muhammad Shahbaz, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Montpellier Research in Management (MRM), Université Paul-Valéry - Montpellier 3 (UPVM)-Université de Perpignan Via Domitia (UPVD)-Groupe Sup de Co Montpellier (GSCM) - Montpellier Business School-Université de Montpellier (UM), and Université Montpellier 1 (UM1)-Université Paul-Valéry - Montpellier 3 (UPVM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Université de Perpignan Via Domitia (UPVD)-Groupe Sup de Co Montpellier (GSCM) - Montpellier Business School-Université de Montpellier (UM)

Subjects
Distributed lag, Economics and Econometrics, Energy, Cointegration, Asymmetries, 020209 energy, 1. No poverty, India, 02 engineering and technology, Energy consumption, Growth, [SHS.ECO]Humanities and Social Sciences/Economics and Finance, Causality, Capital formation, Asymmetric cointegration, [SHS]Humanities and Social Sciences, Microeconomics, General Energy, Capital (economics), 8. Economic growth, 0202 electrical engineering, electronic engineering, information engineering, Econometrics, Economics, Production (economics), Financial Development
Abstract

International audience; This paper investigates the asymmetric relationship between energy consumption and economic growth by incorporating financial development, capital and labour into a production function covering the Indian economy from 1960Q1–2015Q4. The nonlinear autoregressive distributed lag bounds testing approach is applied to examine the asymmetric cointegration between the variables. An asymmetric causality test is also employed to examine the causal association between the considered variables. The results indicate cointegration between the variables in the presence of asymmetries. The asymmetric causality results show that only negative shocks in energy consumption have impacts on economic growth. In the same vein, only negative shocks in financial development have impacts on economic growth. By contrast, symmetrically, capital formation causes economic growth. Finally, over the study period, a neutral effect exists between the labour force and economic growth in India. The implications of these results for growth policies in India are also discussed.

Published
2016

21. The XXL survey XV: evidence for dry merger driven BCG growth in XXL-100-GC X-ray clusters

Author

Bianca M. Poggianti, Marco Scodeggio, Paul Giles, Graham P. Smith, Sean L. McGee, Trevor J. Ponman, C. Lidman, L. Chiappetti, F. Ardila, Florian Pacaud, Dominique Eckert, Bruno Altieri, Angela Bongiorno, L. Guennou, C. Adami, M. Lieu, Fabio Gastaldello, Jochen Liske, B. Gardner, Marguerite Pierre, J. Démoclès, Luigi Guzzo, Shantanu Desai, Lee R. Spitler, Andrii Elyiv, Matt S. Owers, O. V. Melnyk, Jon Willis, S. Lavoie, B. Garilli, Richard J. Tuffs, Andrew M. Hopkins, L. Faccioli, Nicolas Clerc, M. W. Groote, Ivan K. Baldry, Université Quebec, Université du Québec à Chicoutimi (UQAC), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université de Genève = University of Geneva (UNIGE), INAF-IASF Milano, Istituto Nazionale di Astrofisica (INAF), University of Reading (UOR), AUTRES, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), CEA/DCC/DRRV/SCD, Commissariat à l'Energie Atomique, Marcoule, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Ecosystèmes aquatiques et changements globaux (UR EABX), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Max-Planck-Institut für Extraterrestrische Physik (MPE), INAF- Milano, Herschel Science Centre, Agence Spatiale Européenne = European Space Agency (ESA), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Institut d'Astrophysique et de Géophysique [Liège], Université de Liège, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Astronomical Observatory of Kiev, Taras Shevchenko National University of Kyiv, Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), University of Geneva [Switzerland], Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), European Space Agency (ESA), and Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)

Subjects
Initial mass function, Stellar mass, Infrarot-Astrophysik - Abteilung Hofmann, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, cD, 0103 physical sciences, Cluster (physics), Astrophysics::Solar and Stellar Astrophysics, clusters: general [galaxies], Brightest cluster galaxy, 010303 astronomy & astrophysics, evolution [galaxies], Astrophysics::Galaxy Astrophysics, QB, Physics, 010308 nuclear & particles physics, Star formation, interactions [galaxies], Astronomy, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Accretion (astrophysics), Galaxy, Redshift, galaxies: clusters: general, galaxies: elliptical and lenticular, galaxies: evolution, galaxies: interactions, X-rays: galaxies: clusters, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), galaxies: clusters [X-rays], Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], elliptical and lenticular [galaxies]
Abstract

The growth of brightest cluster galaxies is closely related to the properties of their host cluster. We present evidence for dry mergers as the dominant source of BCG mass growth at $z\lesssim1$ in the XXL 100 brightest cluster sample. We use the global red sequence, H$\alpha$ emission and mean star formation history to show that BCGs in the sample possess star formation levels comparable to field ellipticals of similar stellar mass and redshift. XXL 100 brightest clusters are less massive on average than those in other X-ray selected samples such as LoCuSS or HIFLUGCS. Few clusters in the sample display high central gas concentration, rendering inefficient the growth of BCGs via star formation resulting from the accretion of cool gas. Using measures of the relaxation state of their host clusters, we show that BCGs grow as relaxation proceeds. We find that the BCG stellar mass corresponds to a relatively constant fraction 1\%\ of the total cluster mass in relaxed systems. We also show that, following a cluster scale merger event, the BCG stellar mass lags behind the expected value from the M$_{cluster}$ - M$_{BCG}$ relation but subsequently accretes stellar mass via dry mergers as the BCG and cluster evolve towards a relaxed state., Comment: 16 pages, 13 figues

Published
2016

22. The Role of Information Communication Technology and Economic Growth in Recent Electricity Demand: Fresh Evidence from Combine Cointegration Approach in UAE

Author

Rashid Sbia, Ijaz Ur Rehman, Helmi Hamdi, Muhammad Shahbaz, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Centre d'Études et de Recherche en Gestion d'Aix-Marseille (CERGAM), and Aix Marseille Université (AMU)-Université de Toulon (UTLN)

Subjects
ICT, Growth, Electricity, UAE, Consumption (economics), Macroeconomics, Economics and Econometrics, Mains electricity, Cointegration, Technological change, business.industry, 020209 energy, 02 engineering and technology, [SHS.ECO]Humanities and Social Sciences/Economics and Finance, 7. Clean energy, jel:O3, Commerce, Granger causality, 0202 electrical engineering, electronic engineering, information engineering, Economics, Unit root, Electricity, Robustness (economics), business, ComputingMilieux_MISCELLANEOUS
Abstract

This paper investigates the relationship among information communication technology (ICT), economic growth, and electricity consumption in the case of the UAE. The study covers the period of 1975–2011. We have tested the unit root properties of the variables and applied the Bayer-Hanck combined cointegration approach for the long-term relationship. The innovative accounting approach is applied to test the robustness of the VECM Granger causality findings. Our empirical results confirm the existence of the cointegration between the series. We find that ICT increases electricity demand but electricity prices lower it. Income growth increases electricity consumption. The nonlinear relationship between ICT and electricity consumption is an inverted U-shaped. The causality results reveal that ICT and electricity price Granger cause electricity demand. The feedback effect exists between economic growth and electricity consumption. This paper provides new insights to policy makers in designing a comprehensive energy and ICT policy to sustain economic growth for long span of time, although the feedback effect between economic growth and electricity consumption encourages in continuing electricity supply policies.

Published
2016

23. The XXL Survey I. Scientific motivations - XMM-Newton observing plan - Follow-up observations and simulation programme

Author

David Rapetti, Bruno Altieri, Nicolas Clerc, N. Fourmanoit, R. Gastaud, Felipe Menanteau, Bianca M. Poggianti, Angela Bongiorno, M. E. Ramos-Ceja, Marcella Brusa, Andrii Elyiv, Stefano Ettori, Y. Dubois, S. Paltani, O. V. Melnyk, L. Guennou, Sean L. McGee, Emanuela Pompei, A. Butler, Dominique Eckert, C. Adami, F. Finet, C. De Breuck, V. Guglielmo, J. Delhaize, C. Schimd, A. Iovino, Cristian Vignali, K. Husband, Mauro Sereno, S. Desai, Arya Farahi, Steven L. Snowden, Cathy Horellou, Jean-Baptiste Melin, H. J. A. Röttgering, Vernesa Smolčić, Piero Ranalli, J. P. Le Fevre, Elias Koulouridis, J. L. Willis, A. Valotti, David N. Spergel, Minh Huynh, S. A. Stanford, I. Valtchanov, C. Lidman, Manolis Plionis, L. Chiappetti, Jean Surdej, M. Lieu, Thomas H. Reiprich, E. S. Rykoff, Daniel Pomarède, Florian Pacaud, Paolo Ciliegi, T. Sadibekova, I. Georgantopoulos, Sotiria Fotopoulou, C. Benoist, Julien Devriendt, F. Ziparo, S. Lavoie, Ian G. McCarthy, Jean Coupon, J. Démoclès, Mladen Novak, L. Faccioli, José Paulo Santos, Paul Giles, Adam Mantz, Malcolm N. Bremer, Graham P. Smith, Poshak Gandhi, Mark Birkinshaw, S. Maurogordato, Trevor J. Ponman, Ben J Maughan, Pier Stefano Corasaniti, August E. Evrard, Fabio Gastaldello, S. Raychaudury, A. M. C. Le Brun, Martin Kilbinger, J. L. Sauvageot, Sinan Aliş, Chieh-An Lin, E. Rozo, Patrick Valageas, Marguerite Pierre, Chiara Ferrari, B. Baran, Ecosystèmes aquatiques et changements globaux (UR EABX), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), CEA/DCC/DRRV/SCD, Commissariat à l'Energie Atomique, Marcoule, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Herschel Science Centre, Agence Spatiale Européenne = European Space Agency (ESA), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), INAF - Osservatorio Astronomico di Bologna (OABO), Istituto Nazionale di Astrofisica (INAF), INAF- Milano, Max-Planck-Institut für Extraterrestrische Physik (MPE), Institut d'Astrophysique de Paris (IAP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), European Southern Observatory (ESO), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Sub-department of Astrophysics [Oxford], Department of Physics [Oxford], University of Oxford-University of Oxford, Centre de Recherche Astrophysique de Lyon (CRAL), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université de Genève = University of Geneva (UNIGE), INAF-IASF Milano, Institut d'Astrophysique et de Géophysique [Liège], Université de Liège, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département de Géologie, Université de Montréal (UdeM), Aristotle University of Thessaloniki, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Sr. PLM Consultant, Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institute for Space Applications and Remote Sensing (ISARS/NOA), National Observatory of Athens (NOA), Department of Earth and Space Sciences [Göteborg], Chalmers University of Technology [Göteborg], Université Quebec, Université du Québec à Chicoutimi (UQAC), AUTRES, Astronomical Observatory of Kiev, Taras Shevchenko National University of Kyiv, Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ISDC Data Centre for Astrophysics, INAF - Osservatorio Astronomico di Padova (OAPD), Lund Observatory, Lund University [Lund], Argelander Institute for Astronomy (AlfA), Rheinische Friedrich-Wilhelms-Universität Bonn, Leiden Observatory [Leiden], Universiteit Leiden, KIPAC, Stanford (KIPAC), Stanford University-SLAC National Accelerator Laboratory (SLAC), Stanford University, Institut des Sciences Moléculaires d'Orsay (ISMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), University of Reading (UOR), NASA Goddard Space Flight Center (GSFC), Service de Physique Théorique (SPhT), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), European Space Agency (ESA), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Università di Bologna, Dipartimento di Astronomia, Università di Bologna [Bologna] (UNIBO), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), University of Oxford [Oxford]-University of Oxford [Oxford], École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), University of Geneva [Switzerland], Université de Montréal [Montréal], Département d'Electronique, des Détecteurs et d'Informatique (ex SEDI) (DEDI), National Observatory of Athens, Institute for Space Applications and Remote Sensing, Universiteit Leiden [Leiden], Stanford University [Stanford]-SLAC, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), California Institute of Technology (CALTECH)-NASA, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon), Pierre, M., Pacaud, F., Adami, C., Alis, S., Altieri, B., Baran, N., Benoist, C., Birkinshaw, M., Bongiorno, A., Bremer, M.N., Brusa, M., Butler, A., Ciliegi, P., Chiappetti, L., Clerc, N., Corasaniti, P.S., Coupon, J., De Breuck, C., Democles, J., Desai, S., Delhaize, J., Devriendt, J., Dubois, Y., Eckert, D., Elyiv, A., Ettori, S., Evrard, A., Faccioli, L., Farahi, A., Ferrari, C., Finet, F., Fotopoulou, S., Fourmanoit, N., Gandhi, P., Gastaldello, F., Gastaud, R., Georgantopoulos, I., Giles, P., Guennou, L., Guglielmo, V., Horellou, C., Husband, K., Huynh, M., Iovino, A., Kilbinger, M., Koulouridis, E., Lavoie, S., Le Brun, A.M.C., Le Fevre, J.P., Lidman, C., Lieu, M., Lin, C.A., Mantz, A., Maughan, B.J., Maurogordato, S., Mccarthy, I.G., Mcgee, S., Melin, J.B., Melnyk, O., Menanteau, F., Novak, M., Paltani, S., Plionis, M., Poggianti, B.M., Pomarede, D., Pompei, E., Ponman, T.J., Ramos-Ceja, M.E., Ranalli, P., Rapetti, D., Raychaudury, S., Reiprich, T.H., Rottgering, H., Rozo, E., Rykoff, E., Sadibekova, T., Santos, J., Sauvageot, J.L., Schimd, C., Sereno, M., Smith, G.P., Smolčić, V., Snowden, S., Spergel, D., Stanford, S., Surdej, J., Valageas, P., Valotti, A., Valtchanov, I., Vignali, C., Willis, J., Ziparo, F., ITA, FRA, DEU, ESP, BEL, CAN, and TUR

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Large-scale structure of Universe, PRIRODNE ZNANOSTI. Fizika. Astronomija i astrofizika, media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Table (information), X-rays: general, 01 natural sciences, X-rays, general, large-scale structure of Universe, galaxies, clusters, surveys, general [X-rays], 0103 physical sciences, Electronic form, NATURAL SCIENCES. Physics. Astronomy and Astrophysics, Survey, 010303 astronomy & astrophysics, media_common, QB, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Photon statistics, 010308 nuclear & particles physics, Plan (archaeology), Astronomy and Astrophysics, Astronomy and Astrophysic, X-rays: galaxies: cluster, Galaxy, Pathfinder, Sky, Space and Planetary Science, X-rays: galaxies: clusters, Dark energy, galaxies: clusters [X-rays], Astrophysics - High Energy Astrophysical Phenomena, X-rays: diffuse background, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present the XXL Survey, the largest XMM programme totaling some 6.9 Ms to date and involving an international consortium of roughly 100 members. The XXL Survey covers two extragalactic areas of 25 deg2 each at a point-source sensitivity of ~ 5E-15 erg/sec/cm2 in the [0.5-2] keV band (completeness limit). The survey's main goals are to provide constraints on the dark energy equation of state from the space-time distribution of clusters of galaxies and to serve as a pathfinder for future, wide-area X-ray missions. We review science objectives, including cluster studies, AGN evolution, and large-scale structure, that are being conducted with the support of approximately 30 follow-up programmes. We describe the 542 XMM observations along with the associated multi-lambda and numerical simulation programmes. We give a detailed account of the X-ray processing steps and describe innovative tools being developed for the cosmological analysis. The paper provides a thorough evaluation of the X-ray data, including quality controls, photon statistics, exposure and background maps, and sky coverage. Source catalogue construction and multi-lambda associations are briefly described. This material will be the basis for the calculation of the cluster and AGN selection functions, critical elements of the cosmological and science analyses. The XXL multi-lambda data set will have a unique lasting legacy value for cosmological and extragalactic studies and will serve as a calibration resource for future dark energy studies with clusters and other X-ray selected sources. With the present article, we release the XMM XXL photon and smoothed images along with the corresponding exposure maps. The XMM XXL observation list (Table B.1) is available in electronic form at the CDS. The present paper is the first in a series reporting results of the XXL-XMM survey., Comment: 17 pages, accepted in A&A

Published
2016

24. The XXL Survey: VI. The 1000 brightest X-ray point sources

Author

M. E. Ramos-Ceja, C. Adami, T. Sadibekova, Florian Pacaud, Dominique Eckert, Sophie Maurogordato, A. Iovino, L. Guennou, Matt S. Owers, Cathy Horellou, F. Ardila, Elias Koulouridis, Ivan K. Baldry, Christer Lidman, Andrii Elyiv, E. Pompei, Manolis Plionis, Stéphane Arnouts, Sinan Aliş, O. Melnyk, Marcella Brusa, Cristian Vignali, L. Faccioli, Sotiria Fotopoulou, Jon Willis, Seema Y Desai, Richard J. Tuffs, A. Stanford, Jochen Liske, Stéphane Paltani, Joseph J. Mohr, Malcolm N. Bremer, Angela Bongiorno, Marguerite Pierre, Enrico Piconcelli, Felipe Menanteau, Bianca M. Poggianti, L. Chiappetti, Piero Ranalli, Aristotle University of Thessaloniki, CEA/DCC/DRRV/SCD, Commissariat à l'Energie Atomique, Marcoule, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), ISDC Data Centre for Astrophysics, University of Geneva [Switzerland], Lund Observatory, Lund University [Lund], National Observatory of Athens, Institute for Space Applications and Remote Sensing, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Università di Bologna, Dipartimento di Astronomia, Università di Bologna [Bologna] (UNIBO), INAF - Osservatorio Astronomico di Bologna (OABO), Istituto Nazionale di Astrofisica (INAF), INAF- Milano, Institut d'Astrophysique et de Géophysique [Liège], Université de Liège, AUTRES, Astronomical Observatory of Kiev, Taras Shevchenko National University of Kyiv, Ecosystèmes aquatiques et changements globaux (UR EABX), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), INAF - Osservatorio Astronomico di Roma (OAR), Canada-France-Hawaii Telescope Corporation (CFHT), National Research Council of Canada (NRC)-Centre National de la Recherche Scientifique (CNRS)-University of Hawai'i [Honolulu] (UH), INAF-IASF Milano, Department of Earth and Space Sciences [Göteborg], Chalmers University of Technology [Göteborg], Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Excellence Cluster Universe, excellence cluster centre, Max-Planck-Institut für Extraterrestrische Physik (MPE), Ludwig-Maximilians-Universität München (LMU), Jet Propulsion Laboratory (JPL), NASA-California Institute of Technology (CALTECH), Fotopoulou, S., Pacaud, F., Paltani, S., Ranalli, P., Ramos-Ceja, M.E., Faccioli, L., Plionis, M., Adami, C., Bongiorno, A., Brusa, M., Chiappetti, L., Desai, S., Elyiv, A., Lidman, C., Melnyk, O., Pierre, M., Piconcelli, E., Vignali, C., Alis, S., Ardila, F., Arnouts, S., Baldry, I., Bremer, M., Eckert, D., Guennou, L., Horellou, C., Iovino, A., Koulouridis, E., Liske, J., Maurogordato, S., Menanteau, F., Mohr, J.J., Owers, M., Poggianti, B., Pompei, E., Sadibekova, T., Stanford, A., Tuffs, R., Willis, J., Université de Genève = University of Geneva (UNIGE), Institute for Space Applications and Remote Sensing (ISARS/NOA), National Observatory of Athens (NOA), Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, and Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Active galactic nucleus, Point source, Astrophysics::High Energy Astrophysical Phenomena, Infrarot-Astrophysik - Abteilung Hofmann, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Parameter space, catalogs, surveys, galaxies: active, X-rays: general, 01 natural sciences, Spectral line, Supercluster, general [X-rays], 0103 physical sciences, Survey, 010303 astronomy & astrophysics, Luminosity function, Astrophysics::Galaxy Astrophysics, QB, Photometric redshift, Physics, 010308 nuclear & particles physics, Astronomy and Astrophysics, Galaxies: active, Astronomy and Astrophysic, Astrophysics - Astrophysics of Galaxies, Redshift, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), active [galaxies], Catalog, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

X-ray extragalactic surveys are ideal laboratories for the study of the evolution and clustering of active galactic nuclei (AGN). The XXL Survey spans two fields of a combined 50 $deg^2$ observed for more than 6Ms with XMM-Newton, occupying the parameter space between deep surveys and very wide area surveys; at the same time it benefits from a wealth of ancillary data. This paper marks the first release of the XXL point source catalogue selected in the 2-10 keV energy band with limiting flux $F_{2-10keV}=4.8\cdot10^{-14}\rm{erg\,s^{-1}\,cm^{-2}}$. We use both public and proprietary data sets to identify the counterparts of the X-ray point-like sources and improved upon the photometric redshift determination for AGN by applying a Random Forest classification trained to identify for each object the optimal photometric redshift model library. We also assign a probability to each source to be a star or an outlier. We model with Bayesian analysis the X-ray spectra assuming a power-law model with the presence of an absorbing medium. We find an average unabsorbed photon index of $\Gamma=1.85$ and average hydrogen column density $\log{N_{H}}=21.07 cm^{-2}$. We find no trend of $\Gamma$ or $N_H$ with redshift and a fraction of 26% absorbed sources ($\log N_{H}>22$). We show that the XXL-1000-AGN number counts extended the number counts of the COSMOS survey to higher fluxes and are fully consistent with the Euclidean expectation. We constrain the intrinsic luminosity function of AGN in the 2-10 keV energy band where the unabsorbed X-ray flux is estimated from the X-ray spectral fit up to z=3. Finally, we demonstrate the presence of a supercluster size structure at redshift 0.14, identified by means of percolation analysis of the XXL-1000-AGN sample. The XXL survey, reaching a medium flux limit and covering a wide area is a stepping stone between current deep fields and planned wide area surveys., Comment: 29 pages, 20 figures, 120 figures in the appendix, accepted for publication in A&A

Published
2016

25. Forty Years of Suffix Trees

Author

Apostolico, Alberto, Crochemore, Maxime, Farach-Colton, Martín, Galil, Zvi, Muthukrishnan, S., Department of Computer Science [Purdue], Purdue University [West Lafayette], Informatics, King‘s College London, Rutgers, The State University of New Jersey [New Brunswick] (RU), Rutgers University System (Rutgers), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], and Google Inc.

Subjects
factor automaton, wavelet tree, fix tree, [INFO.INFO-DS]Computer Science [cs]/Data Structures and Algorithms [cs.DS], suffix tree, bi-tree, array, suffix, suffix automaton, pattern matching, dawg, suf, string searching, FM-index
Abstract

International audience; This paper reviews the first 40 years in the life of suffix trees, their many incarnations, and their applications. The paper is non-technical but assumes some familiarity with the structures and constructions discussed. It is not meant to be exhaustive. It is meant to be a tribute to a ubiquitous tool of string matching — the suffix tree and its variants — and one of the most persistent subjects of study in the theory of algorithms.

Published
2016

26. ISM Masses and the Star formation Law at Z = 1 to 6: ALMA Observations of Dust Continuum in 145 Galaxies in the COSMOS Survey Field

Author

S. Manohar, Angelo Bongiorno, Clotilde Laigle, H. J. McCracken, Herve Aussel, Sune Toft, Peter Capak, J. Chu, Rob Ivison, Nicholas Lee, J. Álvarez-Márquez, David S Sanders, O. Ilbert, N. Z. Scoville, P. Vanden Bout, Jin Koda, Kartik Sheth, Lena Murchikova, Caitlin M. Casey, Alexandra Pope, ITA, USA, FRA, DEU, DNK, California Institute of Technology (CALTECH), Spitzer Science Center, California Institute of Technology, Pasadena, Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Max-Planck-Institut für Astronomie (MPIA), Max-Planck-Gesellschaft, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], IOA, University of Hawai‘i [Mānoa] (UHM), Stony Brook University [SUNY] (SBU), State University of New York (SUNY), Centre de résonance magnétique biologique et médicale (CRMBM), Aix Marseille Université (AMU)-Assistance Publique - Hôpitaux de Marseille (APHM)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire d'Astrophysique de Marseille (LAM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Dark Cosmology Centre (DARK), Niels Bohr Institute [Copenhagen] (NBI), Faculty of Science [Copenhagen], University of Copenhagen = Københavns Universitet (KU)-University of Copenhagen = Københavns Universitet (KU)-Faculty of Science [Copenhagen], University of Copenhagen = Københavns Universitet (KU)-University of Copenhagen = Københavns Universitet (KU), Royal Observatory Edinburgh (ROE), University of Edinburgh, Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)-Faculty of Science [Copenhagen], and University of Copenhagen = Københavns Universitet (UCPH)-University of Copenhagen = Københavns Universitet (UCPH)

Subjects
Milky Way, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, 010308 nuclear & particles physics, Star formation, Gas depletion, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Galaxy, Accretion (astrophysics), Redshift, Interstellar medium, Stars, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Law, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

ALMA Cycle 2 observations of long-wavelength dust emission in 145 star-forming galaxies are used to probe the evolution of the star-forming interstellar medium (ISM). We also develop a physical basis and empirical calibration (with 72 low-z and z ∼ 2 galaxies) for using the dust continuum as a quantitative probe of ISM masses. The galaxies with the highest star formation rates (SFRs) at < z> = 2.2 and 4.4 have gas masses up to 100 times that of the Milky Way and gas mass fractions reaching 50%-80%, I.e., gas masses 1-4× their stellar masses. We find a single high-z star formation law: {SFR}=35 {M}{mol}0.89× {(1+z)}z=20.95× {({sSFR})}{MS}0.23 {M}☉ yr-1—an approximately linear dependence on the ISM mass and an increased star formation efficiency per unit gas mass at higher redshift. Galaxies above the main sequence (MS) have larger gas masses but are converting their ISM into stars on a timescale only slightly shorter than those on the MS; thus, these “starbursts” are largely the result of having greatly increased gas masses rather than an increased efficiency of converting gas to stars. At z > 1, the entire population of star-forming galaxies has ∼2-5 times shorter gas depletion times than low-z galaxies. These shorter depletion times indicate a different mode of star formation in the early universe—most likely dynamically driven by compressive, high-dispersion gas motions—a natural consequence of the high gas accretion rates.

Published
2016

27. Room-temperature metastability of multilayer graphene oxide films

Author

Elisa Riedo, Walt A. de Heer, Angelo Bongiorno, Suenne Kim, Si Zhou, Yike Hu, Muge Acik, Claire Berger, Yves J. Chabal, School of Physics [Atlanta], Georgia Institute of Technology [Atlanta], College of Computing (GATECH), Department of Materials Science and Engineering (Dallas, USA), University of Texas at Dallas [Richardson] (UT Dallas), Circuits électroniques quantiques Alpes (QuantECA), Institut Néel (NEEL), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)

Subjects
Materials science, Hydrogen, Oxide, chemistry.chemical_element, Nanotechnology, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, law.invention, chemistry.chemical_compound, law, Metastability, Oxidizing agent, Molecule, General Materials Science, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Graphene oxide paper, Graphene, ab initio calculations, Mechanical Engineering, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, chemistry, Chemical engineering, Mechanics of Materials, graphene oxide, Density functional theory, stablility, 0210 nano-technology
Abstract

International audience; Graphene oxide has multiple potential applications. The chemistry of graphene oxide and its response to external stimuli such as temperature and light are not well understood and only approximately controlled. This under- standing is crucial to enable future applications of this material. Here, a com- bined experimental and density functional theory study shows that multilayer graphene oxide produced by oxidizing epitaxial graphene via the Hummers method is a metastable material whose structure and chemistry evolve at room temperature with a characteristic relaxation time of about one month. At the quasi-equilibrium, graphene oxide reaches a nearly-stable reduced O/C ratio, and exhibits a structure intensively deprived of epoxide groups and enriched of hydroxyl groups. Our calculations show that the structural and chemical changes are driven by the availability of hydrogen in the oxidized graphitic sheets, which favors the reduction of epoxide groups and the formation of water molecules.

Published
2012

28. Systematic Study of Azimuthal Anisotropy in Cu$+$Cu and Au$+$Au Collisions at $\sqrt{s_{_{NN}}} = 62.4$ and 200~GeV

Author

Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N. N., Akiba, Y., Al-Bataineh, H., Al-Jamel, A., Alexander, J., Aoki, K., Aphecetche, L., Armendariz, R., Aronson, S. H., Asai, J., Atomssa, E. T., Averbeck, R., Awes, T. C., Azmoun, B., Babintsev, V., Baksay, G., Baksay, L., Baldisseri, A., Barish, K. N., Barnes, P. D., Bassalleck, B., Bathe, S., Batsouli, S., Baublis, V., Bauer, F., Bazilevsky, A., Belikov, S., Bennett, R., Berdnikov, Y., Bickley, A. A., Bjorndal, M. T., Boissevain, J. G., Borel, H., Boyle, K., Brooks, M. L., Brown, D. S., Bucher, D., Buesching, H., Bumazhnov, V., Bunce, G., Burward-Hoy, J. M., Butsyk, S., Campbell, S., Chai, J. -S., Chang, B. S., Charvet, J. -L., Chernichenko, S., Chi, C. Y., Chiba, J., Chiu, M., Choi, I. J., Chujo, T., Chung, P., Churyn, A., Cianciolo, V., Cleven, C. R., Cobigo, Y., Cole, B. A., Comets, M. P., Constantin, P., Csan��d, M., Cs��rg��, T., Dahms, T., Das, K., David, G., Deaton, M. B., Dehmelt, K., Delagrange, H., Denisov, A., d'Enterria, D., Deshpande, A., Desmond, E. J., Dietzsch, O., Dion, A., Donadelli, M., Drachenberg, J. L., Drapier, O., Drees, A., Dubey, A. K., Durum, A., Dzhordzhadze, V., Efremenko, Y. V., Egdemir, J., Ellinghaus, F., Emam, W. S., Enokizono, A., En'yo, H., Espagnon, B., Esumi, S., Eyser, K. O., Fields, D. E., Finger, M., Fleuret, F., Fokin, S. L., Forestier, B., Fraenkel, Z., Frantz, J. E., Franz, A., Frawley, A. D., Fujiwara, K., Fukao, Y., Fung, S. -Y., Fusayasu, T., Gadrat, S., Garishvili, I., Gastineau, F., Germain, M., Glenn, A., Gong, H., Gonin, M., Gosset, J., Goto, Y., de Cassagnac, R. Granier, Grau, N., Greene, S. V., Perdekamp, M. Grosse, Gunji, T., Gustafsson, H. -��., Hachiya, T., Henni, A. Hadj, Haegemann, C., Haggerty, J. S., Hagiwara, M. N., Hamagaki, H., Han, R., Harada, H., Hartouni, E. P., Haruna, K., Harvey, M., Haslum, E., Hasuko, K., Hayano, R., He, X., Heffner, M., Hemmick, T. K., Hester, T., Heuser, J. M., Hiejima, H., Hill, J. C., Hobbs, R., Hohlmann, M., Holmes, M., Holzmann, W., Homma, K., Hong, B., Horaguchi, T., Hornback, D., Huang, S., Hur, M. G., Ichihara, T., Iinuma, H., Imai, K., Inaba, M., Inoue, Y., Isenhower, D., Isenhower, L., Ishihara, M., Isobe, T., Issah, M., Isupov, A., Jacak, B. V., Jia, J., Jin, J., Jinnouchi, O., Johnson, B. M., Joo, K. S., Jouan, D., Kajihara, F., Kametani, S., Kamihara, N., Kamin, J., Kaneta, M., Kang, J. H., Kanou, H., Kawagishi, T., Kawall, D., Kazantsev, A. V., Kelly, S., Khanzadeev, A., Kikuchi, J., Kim, D. H., Kim, D. J., Kim, E., Kim, Y. -S., Kinney, E., Kiss, ��., Kistenev, E., Kiyomichi, A., Klay, J., Klein-Boesing, C., Kochenda, L., Kochetkov, V., Komkov, B., Konno, M., Kotchetkov, D., Kozlov, A., Kr��l, A., Kravitz, A., Kroon, P. J., Kubart, J., Kunde, G. J., Kurihara, N., Kurita, K., Kweon, M. J., Kwon, Y., Kyle, G. S., Lacey, R., Lai, Y. S., Lajoie, J. G., Lebedev, A., Bornec, Y. Le, Leckey, S., Lee, D. M., Lee, M. K., Lee, T., Leitch, M. J., Leite, M. A. L., Lenzi, B., Li, X., Li, X. H., Lim, H., Li��ka, T., Litvinenko, A., Liu, M. X., Love, B., Lynch, D., Maguire, C. F., Makdisi, Y. I., Malakhov, A., Malik, M. D., Manko, V. I., Mao, Y., Ma��ek, L., Masui, H., Matathias, F., McCain, M. C., McCumber, M., McGaughey, P. L., Miake, Y., Mike��, P., Miki, K., Miller, T. E., Milov, A., Mioduszewski, S., Mishra, G. C., Mishra, M., Mitchell, J. T., Mitrovski, M., Morreale, A., Morrison, D. P., Moss, J. M., Moukhanova, T. V., Mukhopadhyay, D., Murata, J., Nagamiya, S., Nagata, Y., Nagle, J. L., Naglis, M., Nakagawa, I., Nakamiya, Y., Nakamura, T., Nakano, K., Newby, J., Nguyen, M., Norman, B. E., Nouicer, R., Nyanin, A. S., Nystrand, J., O'Brien, E., Oda, S. X., Ogilvie, C. A., Ohnishi, H., Ojha, I. D., Oka, M., Okada, K., Omiwade, O. O., Oskarsson, A., Otterlund, I., Ouchida, M., Ozawa, K., Pak, R., Pal, D., Palounek, A. P. T., Pantuev, V., Papavassiliou, V., Park, J., Park, W. J., Pate, S. F., Pei, H., Peng, J. -C., Pereira, H., Peresedov, V., Peressounko, D. Yu., Pinkenburg, C., Pisani, R. P., Purschke, M. L., Purwar, A. K., Qu, H., Rak, J., Rakotozafindrabe, A., Ravinovich, I., Read, K. F., Rembeczki, S., Reuter, M., Reygers, K., Riabov, V., Riabov, Y., Roche, G., Romana, A., Rosati, M., Rosendahl, S. S. E., Rosnet, P., Rukoyatkin, P., Rykov, V. L., Ryu, S. S., Sahlmueller, B., Saito, N., Sakaguchi, T., Sakai, S., Sakata, H., Samsonov, V., Sato, H. D., Sato, S., Sawada, S., Seele, J., Seidl, R., Semenov, V., Seto, R., Sharma, D., Shea, T. K., Shein, I., Shevel, A., Shibata, T. -A., Shigaki, K., Shimomura, M., Shohjoh, T., Shoji, K., Sickles, A., Silva, C. L., Silvermyr, D., Silvestre, C., Sim, K. S., Singh, C. P., Singh, V., Skutnik, S., Slune��ka, M., Smith, W. C., Soldatov, A., Soltz, R. A., Sondheim, W. E., Sorensen, S. P., Sourikova, I. V., Staley, F., Stankus, P. W., Stenlund, E., Stepanov, M., Ster, A., Stoll, S. P., Sugitate, T., Suire, C., Sullivan, J. P., Sziklai, J., Tabaru, T., Takagi, S., Takagui, E. M., Taketani, A., Tanaka, K. H., Tanaka, Y., Tanida, K., Tannenbaum, M. J., Taranenko, A., Tarj��n, P., Thomas, T. L., Todoroki, T., Togawa, M., Toia, A., Tojo, J., Tom����ek, L., Torii, H., Towell, R. S., Tram, V-N., Tserruya, I., Tsuchimoto, Y., Tuli, S. K., Tydesj��, H., Tyurin, N., Vale, C., Valle, H., van Hecke, H. W., Velkovska, J., V��rtesi, R., Vinogradov, A. A., Virius, M., Vrba, V., Vznuzdaev, E., Wagner, M., Walker, D., Wang, X. R., Watanabe, Y., Wessels, J., White, S. N., Willis, N., Winter, D., Woody, C. L., Wysocki, M., Xie, W., Yamaguchi, Y. L., Yanovich, A., Yasin, Z., Ying, J., Yokkaichi, S., Young, G. R., Younus, I., Yushmanov, I. E., Zajc, W. A., Zaudtke, O., Zhang, C., Zhou, S., Zim��nyi, J., Zolin, L., Lancaster University, Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), University of Chicago, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Calcul de l'IN2P3 (CC-IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Sygen International Plc, College of Natural and Applied Sciences, University of Guam, Foundations of Computer Science Laboratory (FCS), Hiroshima University, Department of Water Conservancy [Tianjin], Tianjin Agricultural University (TJAU), University of Kentucky (UK), Laboratoire d'analyse et modélisation de systèmes pour l'aide à la décision (LAMSADE), Université Paris Dauphine-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Earthquake Research Institute [Tokyo], The University of Tokyo (UTokyo), Biological Disaster Analysis Group, Institut de Mathématiques de Jussieu - Paris Rive Gauche (IMJ-PRG), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), National Institute for Environmental Studies (NIES), Department of Neurology, Yale University [New Haven], University of California Davis - Department of Plant Biology, University of California (UC), Massachusetts General Hospital [Boston], Computer Science and Artificial Intelligence Laboratory [Cambridge] (CSAIL), Massachusetts Institute of Technology (MIT), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Smithsonian Institution, Department of Environmental Science, Toho University, Mathématiques, Image et Applications - EA 3165 (MIA), La Rochelle Université (ULR), University of York [York, UK], Laboratoire Informatique, Image et Interaction - EA 2118 (L3I), Faculty of Engineering [Nagano], Shinshu University [Nagano], Service d'Endocrinologie [CHRU Nancy], Centre Hospitalier Régional Universitaire de Nancy (CHRU Nancy), Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), KEK (High energy accelerator research organization), Department of Geography and Environmental Studies, Wilfrid Laurier University (WLU), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], PheniX, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), University of Kentucky, University of California, Université de La Rochelle (ULR), Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École des Ponts ParisTech (ENPC)-École polytechnique (X)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)

Subjects
Quantitative Biology::Neurons and Cognition, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au$+$Au and Cu$+$Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au$+$Au collisions at $\sqrt{s_{_{NN}}}$=200 GeV and 62.4 GeV are the same within uncertainties. However, in Cu$+$Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au$+$Au and Cu$+$Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{\rm part}$. We observe that $v_2$ divided by eccentricity ($\varepsilon$) monotonically increases with $N_{\rm part}$ and scales as ${N_{\rm part}^{1/3}}$. The Cu$+$Cu data at 62.4 GeV falls below the other scaled $v_{2}$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy $KE_T=m_T-m$ between $0.1, Comment: 424 authors, 22 pages, 22 figures, 6 tables. v2 is the version accepted for publication in Phys. Rev. C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

Published
2015

29. The Nexus between Oil price and Russia’s Real Exchange rate: Better Paths via Unconditional vs Conditional Analysis

Author

Aviral Kumar Tiwari, Jamal Bouoiyour, Refk Selmi, Muhammad Shahbaz, Centre d'Analyse Théorique et de Traitement des données économiques (CATT), Université de Pau et des Pays de l'Adour (UPPA), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], and ICFAI University Tripura

Subjects
Conditional analysis, Economics and Econometrics, JEL: F - International Economics/F.F3 - International Finance/F.F3.F31 - Foreign Exchange, Control variable, Differential (mechanical device), Exchange rate, Terms of trade, Unconditional analysis, [SHS.ECO]Humanities and Social Sciences/Economics and Finance, Causality, Russia, Microeconomics, General Energy, JEL: Q - Agricultural and Natural Resource Economics • Environmental and Ecological Economics/Q.Q4 - Energy/Q.Q4.Q43 - Energy and the Macroeconomy, Economic recovery, Econometrics, Economics, JEL: C - Mathematical and Quantitative Methods/C.C1 - Econometric and Statistical Methods and Methodology: General/C.C1.C18 - Methodological Issues: General, Oil price, Productivity, Nexus (standard), Oil price, Exchange rate, Unconditional analysis, Conditional analysis, Russia, ComputingMilieux_MISCELLANEOUS
Abstract

Instead of analyzing the causality between two time series (unconditional analysis), as it is usually done, the present study deals with the nexus between oil price and Russia's real exchange rate conditioning upon potential control variables at well-specified horizons and on a frequency by frequency basis. This research accounts also for the possible transient linkages and signal discontinuities. A major finding of this paper is deeply suggestive of a sharp causality running from oil price to real exchange rate in lower frequencies. This implies that Russia should better tackle with turbulence triggered by oil price and continue to reduce its energy dependency via drastic and proactive measures. The economic and fiscal initiatives of Putin administration may help to cope with sudden shocks, to lessen the great oil dependence and to build confidence needed for economic recovery. While our research does not say much about the routes through which oil price may affect differently real exchange rate, it clearly indicates the presence of short-term relationship conditional to GDP, government expenditures, terms of trade and productivity differential. The conditional analysis and signal detection appear as meaningful exercises to find new insights into the focal issue.

Published
2015

30. Elastic coupling between layers in two-dimensional materials

Author

Roman Sordan, Walt A. de Heer, Daniel Nelias, Suenne Kim, Laura Polloni, Elisa Riedo, Si Zhou, Claire Berger, Angelo Bongiorno, Hsiang Chih Chiu, Yang Gao, State Key Laboratory of Novel Software Technology, Nanjing University (NJU), School of Physics, Georgia Institute of Technology [Atlanta], College of Computing (GATECH), Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne] (LaMCoS), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Circuits électroniques quantiques Alpes (QuantECA), Institut Néel (NEEL), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)

Subjects
Materials science, Oxide, Modulus, Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, Materials Science (all), Chemistry (all), 02 engineering and technology, 010402 general chemistry, 01 natural sciences, law.invention, chemistry.chemical_compound, Condensed Matter::Materials Science, law, Indentation, Condensed Matter::Superconductivity, Perpendicular, General Materials Science, Composite material, Elasticity (economics), Elastic modulus, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Graphene, General Chemistry, 021001 nanoscience & nanotechnology, Strength of materials, 0104 chemical sciences, chemistry, Chemical physics, 0210 nano-technology
Abstract

International audience; Two-dimensional materials, such as graphene and MoS 2 , are films of a few atomic layers in thickness with strong in-plane bonds and weak interactions between the layers. The in-plane elasticity has been widely studied in bending experiments where a suspended film is deformed substantially; however, little is known about the films' elastic modulus perpendicular to the planes, as the measurement of the out-of-plane elasticity of supported 2D films requires indentation depths smaller than the films' interlayer distance. Here, we report on sub-ångström-resolution indentation measurements of the perpendicular-to-the-plane elasticity of 2D materials. Our indentation data, combined with semi-analytical models and density functional theory, are then used to study the perpendicular elasticity of few-layer-thick graphene and graphene oxide films. We find that the perpendicular Young's modulus of graphene oxide films reaches a maximum when one complete water layer is intercalated between the graphitic planes. This non-destructive methodology can map interlayer coupling and intercalation in 2D films.

Published
2015

31. Extreme emission-line galaxies out to z similar to 1 in zCOSMOS I. Sample and characterization of global properties

Author

Amorín, R., Perez-Montero, F., Contini, T., Vílchez, J. M., Bolzonella, M., Tasca, L. A. M., Lamareille, F., Zamorani, G., Maier, C., Carollo, C. M., Kneib, J. -P., Le Fevre, O., Lilly, S., Mainieri, V., Renzini, A., Scodeggio, M., Bardelli, S., Bongiorno, A., Caputi, K., Cucciati, O., Torre, S., Ravel, L., Franzetti, P., Garilli, B., Iovino, A., Knobel, C., Kovac, K., Le Borgne, J. -F., Le Brun, V., Mignoli, M., Pello, R., Peng, Y., Presotto, V., Ricciardelli, E., Silverman, J. D., Tanaka, M., Tresse, L., Vergani, D., Zucca, E., INAF - Osservatorio Astronomico di Roma (OAR), Istituto Nazionale di Astrofisica (INAF), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Instituto de Astrofísica de Andalucía (IAA), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Istituto di Astrofisica Spaziale e Fisica cosmica - Bologna (IASF-Bo), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), University of Vienna [Vienna], University of Chicago, Ecole Polytechnique Fédérale de Lausanne (EPFL), European Southern Observatory (ESO), INAF- Milano, INAF - Osservatorio Astronomico di Bologna (OABO), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Hunan Normal University (HNU), Università degli studi di Trieste = University of Trieste, INAF - Osservatorio Astronomico di Trieste (OAT), INAF - Osservatorio Astrofisico di Arcetri (OAA), Oncology Institute of Southern Switzerland, European Project: 312725,EC:FP7:SPA,FP7-SPACE-2012-1,ASTRODEEP(2013), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Hunan Normal University, and Università degli studi di Trieste

Subjects
Galaxies: fundamental parameters, Galaxies: star formation, Galaxies: abundances, Astrophysics::Solar and Stellar Astrophysics, Galaxies: evolution, Galaxies: irregular, Astrophysics::Cosmology and Extragalactic Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Galaxies: starburst, Astrophysics::Galaxy Astrophysics
Abstract

International audience; Context. The study of large and representative samples of low-metallicity star-forming galaxies at different cosmic epochs is of great interest to the detailed understanding of the assembly history and evolution of low-mass galaxies. Aims. We present a thorough characterization of a large sample of 183 extreme emission-line galaxies (EELGs) at redshift 0.11 \textless= z \textless= 0.93 selected from the 20k zCOSMOS bright survey because of their unusually large emission line equivalent widths. Methods. We use multiwavelength COSMOS photometry, HST-ACS I-band imaging, and optical zCOSMOS spectroscopy to derive the main global properties of star-forming EELGs, such as sizes, stellar masses, star formation rates (SFR), and reliable oxygen abundances using both “direct” and “strong-line” methods. Results. The EELGs are extremely compact (r(50) similar to 1.3 kpc), low-mass (M-* similar to 10(7)-10(10) M-circle dot) galaxies forming stars at unusually high specific star formation rates (sSFR equivalent to SFR/M-star up to 10(-7) yr(-1)) compared to main sequence star-forming galaxies of the same stellar mass and redshift. At rest-frame UV wavelengths, the EELGs are luminous and show high surface brightness and include strong Ly alpha emitters, as revealed by GALEX spectroscopy. We show that zCOSMOS EELGs are high-ionization, low-metallicity systems, with median 12+log(O/H) = 8.16 +/- 0.21 (0.2 Z(circle dot)) including a handful of extremely metal-deficient (\textless0.1 Z(circle dot)) EELGs. While similar to 80% of the EELGs show non-axisymmetric morphologies, including clumpy and cometary or tadpole galaxies, we find that similar to 29% of them show additional low-surface-brightness features, which strongly suggests recent or ongoing interactions. As star-forming dwarfs in the local Universe, EELGs are most often found in relative isolation. While only very few EELGs belong to compact groups, almost one third of them are found in spectroscopically confirmed loose pairs or triplets. Conclusions. The zCOSMOS EELGs are galaxies caught in a transient and probably early period of their evolution, where they are efficiently building up a significant fraction of their present-day stellar mass in an ongoing, galaxy-wide starburst. Therefore, the EELGs constitute an ideal benchmark for comparison studies between low- and high-redshift low-mass star-forming galaxies.

Published
2015

32. OSNT: Open Source Network Tester

Author

Muhammad Shahbaz, Gianni Antichi, G. Adam Covington, Nick Feamster, Andrew W. Moore, Yilong Geng, Marc Bruyere, Michaela Blott, Philippe Owezarski, Bob Felderman, Noa Zilberman, Nick McKeown, Computer Laboratory [Cambridge], University of Cambridge [UK] (CAM), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Computer Science Department [Stanford], Stanford University, Équipe Services et Architectures pour Réseaux Avancés (LAAS-SARA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Google Inc, Research at Google, xilinx (Xilinx inc), Xilinx inc, Antichi, Gianni [0000-0002-6063-4975], Zilberman, Noa [0000-0002-3655-2873], Moore, Andrew [0000-0002-5494-9305], Apollo - University of Cambridge Repository, Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), and Université Fédérale Toulouse Midi-Pyrénées

Subjects
Monitoring, Computer Networks and Communications, Computer science, Clock drift, 02 engineering and technology, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Software, 46 Information and Computing Sciences, 020204 information systems, 0202 electrical engineering, electronic engineering, information engineering, Traffic generation model, Open Source, NetFPGA, business.industry, Network packet, High Speed, 020206 networking & telecommunications, 3 Good Health and Well Being, Network monitoring, Programmable Hardware, 4605 Data Management and Data Science, Hardware and Architecture, Embedded system, Timestamp, Traffic-generation, business, Host (network), Information Systems, Packet-Capture and Packet-Sniffing
Abstract

International audience; Despite network monitoring and testing being critical for computer networks, current solutions are both extremely expensive and inflexible. Into this lacuna we launch the Open Source Network Tester (OSNT), a fully open-source traffic generator and capture system. Our prototype implementation on the NetFPGA-10G supports 4×10Gbps traffic generation across all packet sizes and traffic capture is supported up to 2×10Gbps with na¨ıvena¨ıve host software. Our system implementation provides methods for scaling and coordinating multiple generator/capture systems and supports 6.25ns timestamp resolution with clock drift and phase coordination maintained by a GPS input. Additionally, our approach has demonstrated lower-cost than comparable commercial systems while achieving comparable levels of precision and accuracy; all within an open-source framework extensible with new features to support new applications, while permitting validation and review of the implementation.

Published
2014

33. FlowQoS: QoS for the Rest of Us

Author

Miseon Park, Muhammad Shahbaz, Sarthak Grover, Nick Feamster, Ye-Qiong Song, Sean Donovan, M. Said Seddiki, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Management of dynamic networks and services (MADYNES), Inria Nancy - Grand Est, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Department of Networks, Systems and Services (LORIA - NSS), Laboratoire Lorrain de Recherche en Informatique et ses Applications (LORIA), Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire Lorrain de Recherche en Informatique et ses Applications (LORIA), Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL), Unité de Recherche en Réseaux Radio Mobile Multimédia (MEDIATRON), Ecole supérieure des communications de Tunis (SUP'COM [TUNIS]), Institut National de Recherche en Informatique et en Automatique (Inria)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche en Informatique et en Automatique (Inria)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Laboratoire Lorrain de Recherche en Informatique et ses Applications (LORIA), and Institut National de Recherche en Informatique et en Automatique (Inria)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Router, Bandwidth management, Residential gateway, Computer science, business.industry, Quality of service, Quality of Service (QoS), Software Defined Networking (SDN), [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Home Networks, business, Classifier (UML), Computer network
Abstract

International audience; We describe the architecture of FlowQoS, a system that makes it easier for users in home broadband access networks to configure quality of service based on applications and devices, as opposed to obscure, low-level parameters. The central tenet of FlowQoS's design is control logic that performs application identification and uses flow-table rules to forward traffic through the appropriate rate shapers on a home router. The architecture has two components: a flow classifier, which maps application traffic to the appropriate parts of flow space; and an SDN-based rate shaper, which shapes application traffic by forwarding it through the appropriate shaped virtual links in the home gateway. This paper describes the high-level architecture of FlowQoS, as well as our current implementation.

Published
2014

34. The VIMOS VLT Deep Survey final data release: a spectroscopic sample of 35016 galaxies and AGN out to z~6.7 selected with 17.5<=i_{AB}<=24.7

Author

Fevre, O. Le, Cassata, P., Cucciati, O., Garilli, B., Ilbert, O., Brun, V. Le, Maccagni, D., Moreau, Christophe J, Scodeggio, M., Tresse, L., Zamorani, G., Adami, C., Arnouts, S., Bardelli, S., Bolzonella, M., Bondi, M., Bongiorno, A., Bottini, D., Cappi, A., Charlot, S., Ciliegi, P., Contini, T., De La Torre, S., Foucaud, Sylvie, Franzetti, P., Gavignaud, I., Guzzo, L., Iovino, A., Lemaux, B., McCracken, H. J., Marano, B., Marinoni, Christian, Mazure, A., Mellier, Y., Merighi, R., Merluzzi, P., Paltani, S., Pello, R., Pollo, A., Pozzetti, L., Scaramella, R., Vergani, D., Vettolani, G., Zanichelli, A., Zucca, E., Laboratoire d'Astrophysique de Marseille ( LAM ), Centre National de la Recherche Scientifique ( CNRS ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Aix Marseille Université ( AMU ) -Centre National d'Etudes Spatiales ( CNES ), Dipartimento di Fisica, Università degli studi di Milano [Milano]-Università di Milano-Bicocca, Département Informatique pour les Systèmes Coopératifs Ouverts et Décentralisés ( ISCOD-ENSMSE ), École des Mines de Saint-Étienne ( Mines Saint-Étienne MSE ), Institut Mines-Télécom [Paris]-Institut Mines-Télécom [Paris]-Institut Henri Fayol, AUTRES, Institut de biologie structurale ( IBS - UMR 5075 ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ) -Université Joseph Fourier - Grenoble 1 ( UJF ), School of Chemistry & Biochemistry ( GATECH ), Georgia Institute of Technology [Atlanta], Joseph Louis LAGRANGE ( LAGRANGE ), Université Nice Sophia Antipolis ( UNS ), Université Côte d'Azur ( UCA ) -Université Côte d'Azur ( UCA ) -Observatoire de la Côte d'Azur, Université Côte d'Azur ( UCA ) -Centre National de la Recherche Scientifique ( CNRS ), Institut d'Astrophysique de Paris ( IAP ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), INAF - Osservatorio Astronomico di Bologna ( OABO ), Istituto Nazionale di Astrofisica ( INAF ), Laboratoire Astrophysique de Toulouse-Tarbes ( LATT ), Université Toulouse III - Paul Sabatier ( UPS ), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers ( INSU - CNRS ) -Observatoire Midi-Pyrénées ( OMP ) -Centre National de la Recherche Scientifique ( CNRS ), Institut Clément Ader ( ICA ), Institut Supérieur de l'Aéronautique et de l'Espace ( ISAE-SUPAERO ) -IMT École nationale supérieure des Mines d'Albi-Carmaux ( IMT Mines Albi ) -Université Toulouse III - Paul Sabatier ( UPS ), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique ( CNRS ) -Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ), Istituto di Astrofisica Spaziale e Fisica cosmica - Bologna ( IASF-Bo ), Centre de Physique Théorique - UMR 6207 ( CPT ), Université de la Méditerranée - Aix-Marseille 2-Université de Provence - Aix-Marseille 1-Université de Toulon ( UTLN ) -Centre National de la Recherche Scientifique ( CNRS ), ISDC Data Centre for Astrophysics, University of Geneva [Switzerland], Institut de recherche en astrophysique et planétologie ( IRAP ), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées ( OMP ) -Centre National de la Recherche Scientifique ( CNRS ), INAF - Osservatorio Astrofisico di Arcetri ( OAA ), Laboratoire d'Astrophysique de Marseille (LAM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Università degli Studi di Milano-Bicocca [Milano] (UNIMIB)-Università degli Studi di Milano [Milano] (UNIMI), Département Informatique pour les Systèmes Coopératifs Ouverts et Décentralisés (ISCOD-ENSMSE), École des Mines de Saint-Étienne (Mines Saint-Étienne MSE), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Henri Fayol, College of Computing (GATECH), Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), INAF - Osservatorio Astronomico di Bologna (OABO), Istituto Nazionale di Astrofisica (INAF), Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Istituto di Astrofisica Spaziale e Fisica cosmica - Bologna (IASF-Bo), Centre de Physique Théorique - UMR 6207 (CPT), Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)-Université de Provence - Aix-Marseille 1-Université de la Méditerranée - Aix-Marseille 2, Institut de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), INAF - Osservatorio Astrofisico di Arcetri (OAA), Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Université Fédérale Toulouse Midi-Pyrénées-Centre National d'Études Spatiales [Toulouse] (CNES)-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Université Fédérale Toulouse Midi-Pyrénées-Centre National d'Études Spatiales [Toulouse] (CNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), and Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Université Fédérale Toulouse Midi-Pyrénées-Centre National d'Études Spatiales [Toulouse] (CNES)-Météo-France -Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astrophysics::Cosmology and Extragalactic Astrophysics, [ PHYS.ASTR.CO ] Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We describe the completed VIMOS VLT Deep Survey, and the final data release of 35016 galaxies and type-I AGN with measured spectroscopic redshifts up to redshift z~6.7, in areas 0.142 to 8.7 square degrees, and volumes from 0.5x10^6 to 2x10^7h^-3Mpc^3. We have selected samples of galaxies based solely on their i-band magnitude reaching i_{AB}=24.75. Spectra have been obtained with VIMOS on the ESO-VLT, integrating 0.75h, 4.5h and 18h for the Wide, Deep, and Ultra-Deep nested surveys. A total of 1263 galaxies have been re-observed independently within the VVDS, and from the VIPERS and MASSIV surveys. They are used to establish the redshift measurements reliability, to assess completeness, and to provide a weighting scheme taking into account the survey selection function. We describe the main properties of the VVDS samples, and the VVDS is compared to other spectroscopic surveys. In total we have obtained spectroscopic redshifts for 34594 galaxies, 422 type-I AGN, and 12430 Galactic stars. The survey has enabled to identify galaxies up to very high redshifts with 4669 redshifts in 13, and specific populations like LAE have been identified out to z=6.62. We show that the VVDS occupies a unique place in the parameter space defined by area, depth, redshift coverage, and number of spectra. The VVDS provides a comprehensive survey of the distant universe, covering all epochs since z, or more than 12 Gyr of cosmic time, with a uniform selection, the largest such sample to date. A wealth of science results derived from the VVDS have shed new light on the evolution of galaxies and AGN, and their distribution in space, over this large cosmic time. A final public release of the complete VVDS spectroscopic redshift sample is available at http://cesam.lam.fr/vvds., Comment: Submitted 30 June 2013, Accepted 22 August 2013. Updated with published version

Published
2014

35. The Electricity Consumption in a Rentier State: Do Institutions Matter ?

Author

Jamal Bouoiyour, Refk Selmi, Muhammad Shahbaz, Centre d'Analyse Théorique et de Traitement des données économiques (CATT), Université de Pau et des Pays de l'Adour (UPPA), College of Computing (GATECH), and Georgia Institute of Technology [Atlanta]

Subjects
jel:Q43, Electricity consumption, Institutions, Rentier state, Electricity consumption, institutions, rentier state, Rentier state, Institutions, Electricity consumption, [SHS.ECO]Humanities and Social Sciences/Economics and Finance, jel:Q4
Abstract

The core focus of this paper is to assess the relationship between the electricity consumption and institutions within rentierism phenomenon by incorporating economic growth, urbanization, trade openness and foreign direct investment in the case of Algeria. To this end, we have applied the ARDL bounds testing approach to cointegration and innovative accounting approach (variance decomposition and impulse response methods) over the period of 1971-2012. Our empirical results show that these variables are cointegrated in the long-run. We find that institutions play an important role to explain this cointegration. The response of electricity demand is increasingly negative due to the one standard deviation shock in institutions. This highlights an insightful evidence, providing that the poor governance drawbacks in a rentier state may affect directly electricity consumption or indirectly via urbanization and foreign direct investment. The contribution of economic growth to electricity consumption appears minor (the conservation hypothesis is limitedly supported), while that of trade openness seems insignificant.

Published
2014

36. SPRING: Fast Pseudorandom Functions from Rounded Ring Products

Author

Alon Rosen, Hai Brenner, Gaëtan Leurent, Chris Peikert, Abhishek Banerjee, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Interdisciplinay Center Herzliya - Israel (IDC), Interdisciplinay Center Herzliya, Security, Cryptology and Transmissions (SECRET), Inria Paris-Rocquencourt, and Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)

Subjects
Provable security, Pseudorandom number generator, Ring (mathematics), Theoretical computer science, Parallelizable manifold, Computer science, Polynomial ring, Lattice problem, Homomorphic encryption, learning with rounding, 0102 computer and information sciences, 02 engineering and technology, noisy learning problems, 01 natural sciences, Pseudorandom function family, [INFO.INFO-CR]Computer Science [cs]/Cryptography and Security [cs.CR], 010201 computation theory & mathematics, lattices, pseudorandom functions, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Computer Science::Cryptography and Security
Abstract

International audience; Recently, Banerjee, Peikert and Rosen (EUROCRYPT 2012) proposed new theoretical pseudorandom function candidates based on "rounded products" in certain polynomial rings, which have rigorously provable security based on worst-case lattice problems. The functions also enjoy algebraic properties that make them highly parallelizable and attractive for modern applications, such as evaluation under homomorphic encryption schemes. However, the parameters required by BPR's security proofs are too large for practical use, and many other practical aspects of the design were left unexplored in that work. In this work we give two concrete and practically efficient instantiations of the BPR design, which we call SPRING, for "subset-product with rounding over a ring." One instantiation uses a generator matrix of a binary BCH error-correcting code to "determinstically extract" nearly random bits from a (biased) rounded subset-product. The second instan-tiation eliminates bias by working over suitable moduli and decomposing the computation into "Chinese remainder" components. We analyze the concrete security of these instantiations, and provide initial software implementations whose throughputs are within small factors (as small as 4.5) of those of AES.

Published
2014

37. The nexus between electricity consumption and economic growth in Bahrain

Author

Muhammad Shahbaz, Rashid Sbia, Helmi Hamdi, Centre d'Études et de Recherche en Gestion d'Aix-Marseille (CERGAM), Aix Marseille Université (AMU)-Université de Toulon (UTLN), College of Computing (GATECH), and Georgia Institute of Technology [Atlanta]

Subjects
Macroeconomics, Consumption (economics), Economics and Econometrics, Government, Cointegration, business.industry, jel:C51, Electricity Consumption, Economic Growth, Foreign Direct Investment, Bahrain, Foreign direct investment, [SHS.ECO]Humanities and Social Sciences/Economics and Finance, 7. Clean energy, Capital (economics), Economics, Production (economics), Electricity, jel:C5, business, Nexus (standard), ComputingMilieux_MISCELLANEOUS
Abstract

This paper explores the relationship between electricity consumption, foreign direct investment, capital and economic growth in the case of the Kingdom of Bahrain. The Cobb–Douglas production is used over the period of 1980Q1–2010Q4. We have applied the ARDL bounds testing approach and found that cointegration exists among the series. Electricity consumption, foreign direct investment and capital add in economic growth. The VECM Granger causality analysis has exposed the feedback effect between electricity consumption and economic growth and the same is true for foreign direct investment and electricity consumption. This study suggests government authorities to explore new sources of energy to achieve sustainable economic development for the long run.

Published
2014

38. Chemical bonding and stability of multilayer graphene oxide layers

Author

Cheng Gong, Si Zhou, Suenne Kim, Yves J. Chabal, Muge Acik, Claire Berger, Eliso Riedo, Yike Hu, Angelo Bongiorno, Walt A. de Heer, School of Physics, Georgia Institute of Technology [Atlanta], College of Computing (GATECH), School of Physics [Atlanta], Department of Materials Science and Engineering (Dallas, USA), University of Texas at Dallas [Richardson] (UT Dallas), Circuits électroniques quantiques Alpes (QuantECA), Institut Néel (NEEL), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)

Subjects
Materials science, Hydrogen, Graphene, Annealing (metallurgy), chemical stability and evolution, Oxide, chemistry.chemical_element, law.invention, chemistry.chemical_compound, symbols.namesake, chemistry, X-ray photoelectron spectroscopy, Chemical engineering, law, symbols, Molecule, graphene oxide, Graphite, Raman spectroscopy, infrared spectroscopy, first principles calculations, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall]
Abstract

International audience; The chemistry of graphene oxide (GO) and its response to external stimuli such as temperature and light are not well understood and only approximately controlled. This understanding is however crucial to enable future applications of the material that typically are subject to environmental conditions. The nature of the initial GO is also highly dependent on the preparation and the form of the initial carbon material. Here, we consider both standard GO made from oxidizing graphite and layered GO made from oxidizing epitaxial graphene on SiC, and examine their evolution under different stimuli. The effect of the solvent on the thermal evolution of standard GO in vacuum is first investigated. In situ infrared absorption measurements clearly show that the nature of the last solvent in contact with GO prior to deposition on a substrate for vacuum annealing studies substantially affect the chemical evolution of the material as GO is reduced. Second, the stability of GO derived from epitaxial graphene (on SiC) is examined as a function of time. We show that hydrogen, in the form of CH, is present after the Hummers process, and that hydrogen favors the reduction of epoxide groups and the formation of water molecules. Importantly, this transformation can take place at room temperature, albeit slowly (~ one month). Finally, the chemical interaction (e.g. bonding) between GO layers in multilayer samples is examined with diffraction (XRD) methods, spectroscopic (IR, XPS, Raman) techniques, imaging (APF) and first principles modeling.

Published
2014

39. Fill-in reduction in sparse matrix factorizations using hypergraphs

Author

Kaya, Oguz, Kayaaslan, Enver, Uçar, Bora, Duff, Iain S., College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Optimisation des ressources : modèles, algorithmes et ordonnancement (ROMA), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de l'Informatique du Parallélisme (LIP), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS), STFC Rutherford Appleton Laboratory (RAL), Science and Technology Facilities Council (STFC), This work was partially supported by the LABEX MILYON (ANR-10-LABX-0070) of Université de Lyon, within the program 'Investissements d’Avenir' (ANR-11-IDEX-0007) operated by the French National Research Agency (ANR), and also by ANR project SOLHAR (ANR-13-MONU-0007). The research of I. S. Duff was supported in part by the EPSRC Grant EP/I013067/1., INRIA, ANR-10-LABX-0070,MILYON,Community of mathematics and fundamental computer science in Lyon(2010), ANR-11-IDEX-0007,Avenir L.S.E.,PROJET AVENIR LYON SAINT-ETIENNE(2011), ANR-13-MONU-0007,SOLHAR,Solveurs pour architectures hétérogènes utilisant des supports d'exécution(2013), Centre National de la Recherche Scientifique (CNRS)-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Centre National de la Recherche Scientifique (CNRS)-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École normale supérieure - Lyon (ENS Lyon), Laboratoire de l'Informatique du Parallélisme (LIP), CERFACS, École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL)

Subjects
hypergraph partitioning, sparse matrices, LU factorization, [INFO.INFO-DS]Computer Science [cs]/Data Structures and Algorithms [cs.DS], QR factorization, Fill-reducing orderings, [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM], direct methods, Cholesky factorization
Abstract

We discuss the use of hypergraph partitioning based methods in fill-reducing orderings of sparse matrices for Cholesky, LU and QR factorizations. For the Cholesky factorization, we investigate a recent result on pattern-wise decomposition of sparse matrices, generalize the result, and develop algorithmic tools to obtain more effective ordering methods. The generalized results help us formulate the fill-reducing ordering problem for LU factorization as we do for the Cholesky case, without ever symmetrizing the given matrix $A$ as $|A| + |A^T|$ or $|^AT ||A|$. For the QR factorization, we adopt a recently proposed technique to use hypergraph models in a fairly standard manner. The method again does not form the possibly much denser matrix $|A^T ||A|$. We also discuss alternatives for LU and QR factorization cases where the symmetrized matrix can be used. We provide comparisons with the most common alternatives in all three cases.

Published
2014

40. Film Structure of Epitaxial Graphene Oxide on SiC: Insight on the Relationship between Interlayer Spacing, Water Content, and Intralayer Structure

Author

W. A. de Heer, Carmela Aruta, Cheng Gong, Angelo Bongiorno, E. Di Gennaro, Yves J. Chabal, Soo Young Kim, Claire Berger, Xi Lu, Yiran Hu, Elisa Riedo, Si Zhou, Zhou, S., Kim, S., DI GENNARO, Emiliano, Hu, Y., Gong, C., Lu, X., Berger, C., De Heer, W., Riedo, E., Chabal, Y. J., Aruta, C., Bongiorno, A., College of Computing (GATECH), Georgia Institute of Technology [Atlanta], School of Physics, Dipartimento di Scienze Fisiche [Naples], Università degli studi di Napoli Federico II, Laboratory for Surface and Nanostructure Modifications, University of Texas at Dallas [Richardson] (UT Dallas), Circuits électroniques quantiques Alpes (QuantECA), Institut Néel (NEEL), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)

Subjects
Materials science, XRD, Oxide, ATR-IR, chemistry.chemical_element, FOS: Physical sciences, DFT calculation, multilayer epitaxial graphene, Graphite oxide, law.invention, chemistry.chemical_compound, law, Silicon carbide, Molecule, Nanoscopic scale, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], Condensed Matter - Materials Science, Graphene, Mechanical Engineering, Materials Science (cond-mat.mtrl-sci), chemistry, Chemical engineering, Mechanics of Materials, graphene oxide, Density functional theory, AFM, Carbon
Abstract

Chemical oxidation of multilayer graphene grown on silicon carbide yields films exhibiting reproducible characteristics, lateral uniformity, smoothness over large areas, and manageable chemical complexity, thereby opening opportunities to accelerate both fundamental understanding and technological applications of this form of graphene oxide films. Here, we investigate the vertical inter-layer structure of these ultra-thin oxide films. X-ray diffraction, atomic force microscopy, and IR experiments show that the multilayer films exhibit excellent inter-layer registry, little amount (, Comment: 23 pages, 4 figures

Published
2014

41. On Ideal Lattices and Learning with Errors over Rings

Author

Chris Peikert, Oded Regev, Vadim Lyubashevsky, Construction and Analysis of Systems for Confidentiality and Authenticity of Data and Entities (CASCADE), Département d'informatique - ENS Paris (DI-ENS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche en Informatique et en Automatique (Inria)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche en Informatique et en Automatique (Inria)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Inria Paris-Rocquencourt, Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Courant Institute of Mathematical Sciences [New York] (CIMS), New York University [New York] (NYU), NYU System (NYU)-NYU System (NYU), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Inria Paris-Rocquencourt, Département d'informatique de l'École normale supérieure (DI-ENS), École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)

Subjects
Theoretical computer science, Hash function, 0102 computer and information sciences, 02 engineering and technology, public key encryption, 01 natural sciences, [INFO.INFO-CR]Computer Science [cs]/Cryptography and Security [cs.CR], Artificial Intelligence, 0202 electrical engineering, electronic engineering, information engineering, Cryptosystem, Quantum computer, Mathematics, Pseudorandom number generator, cryptography, Lattice problem, quantum computation, Lattice, 020206 networking & telecommunications, average-case hardness, 010201 computation theory & mathematics, Hardware and Architecture, Control and Systems Engineering, Quantum algorithm, Lattice-based cryptography, Algorithm, Software, Learning with errors, Information Systems
Abstract

The “learning with errors” (LWE) problem is to distinguish random linear equations, which have been perturbed by a small amount of noise, from truly uniform ones. The problem has been shown to be as hard as worst-case lattice problems, and in recent years it has served as the foundation for a plethora of cryptographic applications. Unfortunately, these applications are rather inefficient due to an inherent quadratic overhead in the use of LWE. A main open question was whether LWE and its applications could be made truly efficient by exploiting extra algebraic structure, as was done for lattice-based hash functions (and related primitives). We resolve this question in the affirmative by introducing an algebraic variant of LWE called ring-LWE , and proving that it too enjoys very strong hardness guarantees. Specifically, we show that the ring-LWE distribution is pseudorandom, assuming that worst-case problems on ideal lattices are hard for polynomial-time quantum algorithms. Applications include the first truly practical lattice-based public-key cryptosystem with an efficient security reduction; moreover, many of the other applications of LWE can be made much more efficient through the use of ring-LWE.

Published
2013

42. Measuring and Mitigating Web Performance Bottlenecks in Broadband Access Networks

Author

Sundaresan, Srikanth, Feamster, Nick, Teixeira, Renata, Magharei, Nazanin, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Networks and Performance Analysis (NPA), Laboratoire d'Informatique de Paris 6 (LIP6), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratory of Information, Network and Communication Sciences (LINCS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institut Mines-Télécom [Paris] (IMT), Cisco Systems, and CISCO Systems, Inc

Subjects
[INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS
Abstract

International audience; We measure Web performance bottlenecks in home broadband ac- cess networks and evaluate ways to mitigate these bottlenecks with caching within home networks. We first measure Web performance bottlenecks to nine popular Web sites from more than 5,000 broad- band access networks and demonstrate that when the downstream throughput of the access link exceeds about 16 Mbits/s, latency is the main bottleneck for Web page load time. Next, we use a router- based Web measurement tool, Mirage, to deconstruct Web page load time into its constituent components (DNS lookup, TCP con- nection setup, object download) and show that simple latency opti- mizations can yield significant improvements in overall page load times. We then present a case for placing a cache in the home net- work and deploy three common optimizations: DNS caching, TCP connection caching, and content caching. We show that caching only DNS and TCP connections yields significant improvements in page load time, even when the user's browser is already performing similar independent optimizations. Finally, we use traces from real homes to demonstrate how prefetching DNS and TCP connections for popular sites in a home-router cache can achieve faster page load times.

Published
2013

43. Architecture for an open source network tester

Author

Muhammad Shahbaz, Gianni Antichi, Yilong Geng, Noa Zilberman, Adam Covington, Marc Bruyere, Nick Feamster, Nick McKeown, Bob Felderman, Michaela Blott, Andrew W. Moore, Philippe Owezarski, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Computer Laboratory [Cambridge], University of Cambridge [UK] (CAM), Computer Science Department [Stanford], Stanford University, Équipe Services et Architectures pour Réseaux Avancés (LAAS-SARA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Google Inc, Research at Google, xilinx (Xilinx inc), Xilinx inc, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
Open Source, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Packet-Capture, Monitoring, High Speed, Packet- Sniffing, NetF- PGA, Programmable Hardware, Traffic-Generation
Abstract

International audience; To make networks more reliable, enormous resources are poured into all phases of the network-equipment lifecycle. The process starts early in the design phase when simula- tion is used to verify the correctness of a design, and con- tinues through manufacturing and perhaps months of rigor- ously trials. With over 7,000 Internet RFCs and hundreds of IEEE standards, a typical piece of networking equipment undergoes hundreds of conformance tests before being de- ployed. Finally, when deployed in a production network, the equipment is tested regularly. Throughout the process, a relentless battery of tests and measurement help ensure the correct operation of the equipment. Not surprisingly, to support the testing effort, there is a multi-billion dollar industry building and selling network test equipment for all stages of design, development and deployment. It is common for a large network equipment vendor to spend tens of millions of dollars per year on test equipment (from companies such as Ixia, Spirent, Fluke, and Emulex/Endace) to test physical layers, protocols and ap- plications. Researchers and educators would also like to use test equipment to understand current networks and when prototyping new ideas. Unfortunately, commercial test equip- ment is closed, proprietary - making it difficult to try out new ideas - and high prices place it well beyond reach of most university teaching and research laboratories.1 We believe that it is no longer necessary to build network testers upon specialized, proprietary hardware; it is now pos- sible to develop open-source network testers that run at line- rate, particularly at 10Gb/s. The NetFPGA-10G, Xilinx V5TXT and Terasic DE5-Net, are all programmable, open- source hardware platforms that can be programmed to test networks at line-rate. For example, the NetFPGA-10G (de- veloped by the authors) has 4 × 10GbE interfaces, is based on an FPGA, and is available to the research and teaching community for less than $2,000.

Published
2013

44. Characterizing Home Network Performance Problems

Author

Sundaresan, Srikanth, Feamster, Nick, Teixeira, Renata, Grunenberger, Yan, Papagiannaki, Dina, Levin, Dave, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Networks and Performance Analysis (NPA), Laboratoire d'Informatique de Paris 6 (LIP6), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratory of Information, Network and Communication Sciences (LINCS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institut Mines-Télécom [Paris] (IMT), Telefonica Investigación y Desarrollo (Telefonica I+D), Telefonica Group, Department of Computer Science [College Park], University of Maryland [College Park], University of Maryland System-University of Maryland System, and Teixeira, Renata

Subjects
[INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], [INFO.INFO-NI] Computer Science [cs]/Networking and Internet Architecture [cs.NI]
Abstract

We design, develop, validate, and deploy WTF (Where's The Fault?), a system that determines whether a performance problem in a home network lies with the ISP or inside the home network. WTF uses four independent maximum like- lihood detectors to detect both access link bottlenecks and wireless network pathologies with high detection rates and low false positive rates; we use extensive controlled exper- iments to determine the appropriate thresholds for each pa- rameter that we measure. We implemented WTF as cus- tom firmware that runs in an off-the-shelf home router and deployed it in 64 home networks across 15 countries. The real-world deployment sheds light on common pathologies that occur in home networks. We find that wireless bottle- necks are significantly more common than access link bot- tlenecks, that the 5 GHz spectrum consistently outperforms the 2.4 GHz spectrum, that many homes experience high TCP round-trip latencies between wireless clients and the ac- cess point, and that performance can vary dramatically across wireless devices, even within a single home network.

Published
2013

45. Classical hardness of learning with errors

Author

Damien Stehlé, Chris Peikert, Oded Regev, Zvika Brakerski, Adeline Langlois, Department of Computer Science and Applied Mathematics [Rehovot], Weizmann Institute of Science [Rehovot, Israël], Arithmetic and Computing (ARIC), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de l'Informatique du Parallélisme (LIP), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Informatique du Parallélisme (LIP), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Courant Institute of Mathematical Sciences [New York] (CIMS), New York University [New York] (NYU), NYU System (NYU)-NYU System (NYU), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL)

Subjects
FOS: Computer and information sciences, Discrete mathematics, Computer Science - Cryptography and Security, business.industry, Lattice problem, Homomorphic encryption, 020206 networking & telecommunications, Cryptography, 0102 computer and information sciences, 02 engineering and technology, Computational Complexity (cs.CC), 01 natural sciences, Computer Science - Computational Complexity, Dimension (vector space), 010201 computation theory & mathematics, 0202 electrical engineering, electronic engineering, information engineering, business, Cryptography and Security (cs.CR), Quantum, Learning with errors, Mathematics
Abstract

We show that the Learning with Errors (LWE) problem is classically at least as hard as standard worst-case lattice problems, even with polynomial modulus. Previously this was only known under quantum reductions. Our techniques capture the tradeoff between the dimension and the modulus of LWE instances, leading to a much better understanding of the landscape of the problem. The proof is inspired by techniques from several recent cryptographic constructions, most notably fully homomorphic encryption schemes., Preliminary version in STOC'13

Published
2013

46. PROTO-GROUPS AT 1.8 \textless z \textless 3 IN THE zCOSMOS-DEEP SAMPLE

Author

Diener, C., Lilly, S. J., Knobel, C., Zamorani, G., Lemson, G., Kampczyk, P., Scoville, N., Carollo, C. M., Contini, T., Kneib, J. -P., Le Fevre, O., Mainieri, V., Renzini, A., Scodeggio, M., Bardelli, S., Bolzonella, M., Bongiorno, A., Caputi, K., Cucciati, O., Torre, S., Ravel, L., Franzetti, P., Garilli, B., Iovino, A., Kovac, K., Lamareille, F., Le Borgne, J. -F., Le Brun, V., Maier, C., Mignoli, M., Pelló, R., Peng, Y., Perez Montero, E., Presotto, V., Silverman, J., Tanaka, M., Tasca, L., Tresse, L., Vergani, D., Zucca, E., Bordoloi, R., Cappi, A., Cimatti, Alessandro, Coppa, G., Koekemoer, A. M., Lopez-Sanjuan, C., Mccracken, H. J., Moresco, M., Nair, P., Pozzetti, L., Welikala, N., Institute for Astronomy [Zürich], Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), AUTRES, Istituto di Astrofisica Spaziale e Fisica cosmica - Bologna (IASF-Bo), Istituto Nazionale di Astrofisica (INAF), California Institute of Technology (CALTECH), University of Chicago, Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), European Southern Observatory (ESO), INAF - Osservatorio Astronomico di Padova (OAPD), INAF- Milano, INAF - Osservatorio Astronomico di Bologna (OABO), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Dipartimento di Fisica, Università degli Studi di Milano-Bicocca [Milano] (UNIMIB)-Università degli Studi di Milano [Milano] (UNIMI), Institut de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, Hunan Normal University, Università degli studi di Trieste, INAF - Osservatorio Astronomico di Trieste (OAT), INAF - Osservatorio Astrofisico di Arcetri (OAA), INAF - Osservatorio Astronomico di Brera (OAB), Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Space Telescope Science Institute (STSci), Institut d'Astrophysique de Paris (IAP), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Milano-Bicocca = University of Milano-Bicocca (UNIMIB)-Università degli Studi di Milano = University of Milan (UNIMI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Hunan Normal University (HNU), Università degli studi di Trieste = University of Trieste, Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
Abstract

International audience; We identify 42 “candidate groups” lying between 1.8\textlessz\textless3.0 from a sample of 3502 galaxies with spectroscopic redshifts in the zCOSMOS-deep redshift survey within this same redshift interval. These systems contain three to five spectroscopic galaxies that lie within 500 kpc in projected distance (in physical space) and within 700 km s(-1) in velocity. Based on extensive analysis of mock catalogs that have been generated from the Millennium simulation, we examine the likely nature of these systems at the time of observation, and what they will evolve into down to the present epoch. Although few of the “member” galaxies are likely to reside in the same halo at the epoch we observe them, 50% of the systems will have, by the present epoch, all of the member galaxies in the same halo, and almost all (93%) will have at least some of the potential members in the same halo. Most of the candidate groups can therefore be described as “proto-groups.” A crude estimate of the overdensities of these structures is also consistent with the idea that these systems are being seen as they assemble. We also examine present-day halos and ask whether their progenitors would have been seen among our candidate groups. For present-day halos between 10(14) and 10(15) M(circle dot)h(-1), 35% should have appeared among our candidate groups, and this would have risen to 70% if our survey had been fully sampled, so we can conclude that our sample can be taken as representative of a large fraction of such systems. There is a clear excess of massive galaxies above 10(10)M(circle dot) around the locations of the candidate groups in a large independent COSMOS photo-z sample, but we see no evidence in this latter data for any color differentiation with respect to the field. This is, however, consistent with the idea that such differentiation arises in satellite galaxies, as indicated at z \textless1, if the candidate groups are indeed only starting to be assembled.

Published
2013

47. On the minimum edge cover and vertex partition by quasi-cliques problems

Author

Kaya, Oguz, Kayaaslan, Enver, Uçar, Bora, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Department of Computer Engineering (Bilkent-CS), Bilkent University [Ankara], Optimisation des ressources : modèles, algorithmes et ordonnancement (ROMA), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de l'Informatique du Parallélisme (LIP), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Informatique du Parallélisme (LIP), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS), INRIA, École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL)

Subjects
[MATH.MATH-CO]Mathematics [math]/Combinatorics [math.CO], [INFO.INFO-DM]Computer Science [cs]/Discrete Mathematics [cs.DM]
Abstract

A $\gamma$-quasi-clique in a simple undirected graph is a set of vertices which induces a subgraph with the edge density of at least $\gamma$ for $0

Published
2013

48. ENVIRONMENTAL EFFECTS IN THE INTERACTION AND MERGING OF GALAXIES IN zCOSMOS

Author

P. Kampczyk, S. J. Lilly, L. de Ravel, O. Le Fèvre, M. Bolzonella, C. M. Carollo, C. Diener, C. Knobel, K. Kovač, C. Maier, A. Renzini, M. T. Sargent, D. Vergani, U. Abbas, S. Bardelli, A. Bongiorno, R. Bordoloi, K. Caputi, T. Contini, G. Coppa, O. Cucciati, S. de la Torre, P. Franzetti, B. Garilli, A. Iovino, J.-P. Kneib, A. M. Koekemoer, F. Lamareille, J.-F. Le Borgne, V. Le Brun, A. Leauthaud, V. Mainieri, M. Mignoli, R. Pello, Y. Peng, E. Perez Montero, E. Ricciardelli, M. Scodeggio, J. D. Silverman, M. Tanaka, L. Tasca, L. Tresse, G. Zamorani, E. Zucca, D. Bottini, A. Cappi, P. Cassata, A. Cimatti, M. Fumana, L. Guzzo, J. Kartaltepe, C. Marinoni, H. J. McCracken, P. Memeo, B. Meneux, P. Oesch, C. Porciani, L. Pozzetti, R. Scaramella, AUTRES, Institute for Astronomy [Zürich], Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), University of Chicago, Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), INAF - Osservatorio Astrofisico di Arcetri (OAA), Istituto Nazionale di Astrofisica (INAF), INAF - Osservatorio Astrofisico di Torino (OATo), College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Dipartimento di Fisica, Università degli Studi di Milano-Bicocca = University of Milano-Bicocca (UNIMIB)-Università degli Studi di Milano = University of Milan (UNIMI), Ecole Polytechnique Fédérale de Lausanne (EPFL), Institut de recherche en astrophysique et planétologie (IRAP), California Institute of Technology (CALTECH), European Southern Observatory (ESO), Hunan Normal University (HNU), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), National Optical Astronomy Observatory (NOAO), Centre de Physique Théorique - UMR 6207 (CPT), Université de la Méditerranée - Aix-Marseille 2-Université de Provence - Aix-Marseille 1-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Astronomy, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, Centre National de la Recherche Scientifique (CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Università degli Studi di Milano-Bicocca [Milano] (UNIMIB)-Università degli Studi di Milano [Milano] (UNIMI), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Hunan Normal University, Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Toulon (UTLN)-Université de Provence - Aix-Marseille 1-Université de la Méditerranée - Aix-Marseille 2, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Kampczyk P., Lilly S. J., de Ravel L., Le Fèvre O., Bolzonella M., Carollo C. M., Diener C., Knobel C., Kovac K., Maier C., Renzini A., Sargent M. T., Vergani D., Abbas U., Bardelli S., Bongiorno A., Bordoloi R., Caputi K., Contini T., Coppa G., Cucciati O., de la Torre S., Franzetti P., Garilli B., Iovino A., Kneib J.-P., Koekemoer A. M., Lamareille F., Le Borgne J.-F., Le Brun V., Leauthaud A., Mainieri V., Mignoli M., Pello R., Peng Y., Perez Montero E., Ricciardelli E., Scodeggio M., Silverman J. D., Tanaka M., Tasca L., Tresse L., Zamorani G., Zucca E., Bottini D., Cappi A., Cassata P., Cimatti A., Fumana M., Guzzo L., Kartaltepe J., Marinoni C., McCracken H. J., Memeo P., Meneux B., Oesch P., Porciani C., Pozzetti L., and Scaramella R.

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010504 meteorology & atmospheric sciences, Population, FOS: Physical sciences, galaxies: starburst, MORPHOLOGICAL TRANSFORMATION, Astrophysics, Kinematics, Astrophysics::Cosmology and Extragalactic Astrophysics, STAR-FORMATION RATES, MERGER RATE EVOLUTION, 01 natural sciences, SIMILAR-TO 1, galaxies: evolution, galaxies: general, galaxies: interactions, Astronomy and Astrophysics, Space and Planetary Science, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], 0103 physical sciences, Fraction (mathematics), education, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, QB, Physics, education.field_of_study, FORMATION HISTORY, Star formation, CLOSE PAIRS, Cosmology: observations, Galaxies: high-redshift, Galaxies: statistics, Large-scale structure of Universe, CNOC2 REDSHIFT SURVEY, DISK GALAXIES, Environmental variation, Galaxy, Redshift, COSMOS FIELD, DIGITAL SKY SURVEY, Irregular galaxy, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

(Abridged) We analyze the environments and galactic properties (morphologies and star-formation histories) of a sample of 153 close kinematic pairs in the redshift range 0.2 < z < 1 identified in the zCOSMOS-bright 10k spectroscopic sample of galaxies. Correcting for projection effects, the fraction of close kinematic pairs is three times higher in the top density quartile than in the lowest one. This translates to a three times higher merger rate because the merger timescales are shown, from mock catalogues based on the Millennium simulation, to be largely independent of environment once the same corrections for projection is applied. We then examine the morphologies and stellar populations of galaxies in the pairs, comparing them to control samples that are carefully matched in environment so as to remove as much as possible the well-known effects of environment on the properties of the parent population of galaxies. Once the environment is properly taken into account in this way, we find that the early-late morphology mix is the same as for the parent population, but that the fraction of irregular galaxies is boosted by 50-75%, with a disproportionate increase in the number of irregular-irregular pairs (factor of 4-8 times), due to the disturbance of disk galaxies. Future dry-mergers, involving elliptical galaxies comprise less than 5% of all close kinematic pairs. In the closest pairs, there is a boost in the specific star-formation rates of star-forming galaxies of a factor of 2-4, and there is also evidence for an increased incidence of post star-burst galaxies. Although significant for the galaxies involved, the "excess" star-formation associated with pairs represents only about 5% of the integrated star-formation activity in the parent sample. Although most pair galaxies are in dense environments, the effects of interaction appear to be largest in the lower density environments., 38 pages, 17 figures, submitted to ApJ

Published
2013

49. Accreting supermassive black holes in the COSMOS field and the connection to their host galaxies

Author

A. Bongiorno, A. Merloni, M. Brusa, B. Magnelli, M. Salvato, M. Mignoli, G. Zamorani, F. Fiore, D. Rosario, V. Mainieri, H. Hao, A. Comastri, C. Vignali, I. Balestra, S. Bardelli, S. Berta, F. Civano, P. Kampczyk, E. Le Floc'h, E. Lusso, D. Lutz, L. Pozzetti, F. Pozzi, L. Riguccini, F. Shankar, J. Silverman, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], Max Planck Institute for Extraterrestrial Physics (MPE), Max-Planck-Gesellschaft, AUTRES, Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre Européen de Réalité Virtuelle (CERV), École Nationale d'Ingénieurs de Brest (ENIB), Istituto Nazionale di Astrofisica (INAF), INAF - Osservatorio Astronomico di Trieste (OAT), Max-Planck-Institut für Extraterrestrische Physik (MPE), Centre National de la Recherche Scientifique (CNRS), INAF - Osservatorio Astrofisico di Arcetri (OAA), University of Bologna, Observatório do Valongo/UFRJ [Rio de Janeiro], Universidade Federal do Rio de Janeiro (UFRJ), Galaxies, Etoiles, Physique, Instrumentation (GEPI), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Active galactic nucleus, Stellar mass, Astrophysics::High Energy Astrophysical Phenomena, Extinction (astronomy), Population, Active - galaxies, Catalogues - surveys - galaxies, Evolution - galaxies, Fundamental parameters, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Luminosity, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, education, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, ComputingMilieux_MISCELLANEOUS, Physics, [PHYS]Physics [physics], education.field_of_study, 010308 nuclear & particles physics, Star formation, Astronomy and Astrophysics, Redshift, Galaxy, Space and Planetary Science, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

Using the wide multi-band photometry available in the COSMOS field we explore the host galaxy properties of a large sample of Active Galactic Nuclei (AGN) obtained by combining X-ray and optical spectroscopic selections. Based on a careful study of their Spectral Energy Distribution (SED), which has been parametrized using a 2-component (AGN+galaxy) model fit, we derived dust-corrected rest-frame magnitudes, colors, stellar masses and star formation rates (SFRs). We find that AGN hosts span a large range of stellar masses and SFRs. No color-bimodality is seen at any redshift in the AGN hosts, which are found to be mainly massive, red galaxies. Once accounting for the color-mass degeneracy in well defined mass-matched samples, we find a residual marginal enhancement of AGN incidence in redder galaxies with lower specific star formation rates, and we argue that this result might emerge because of our ability to properly account for AGN light contamination and dust extinction. Interestingly, we find that the probability for a galaxy to host a black hole growing at any given "specific accretion rate" (i.e. the ratio of X-ray luminosity to the host stellar mass) is almost independent of the host galaxy mass, while it decreases as a power-law with Lx/M. By analyzing the normalization of such probability distribution, we show how the incidence of AGN increases with redshift as rapidly as (1+z)^4, in close resemblance with the overall evolution of the specific star formation rate of the entire galaxy population. Although AGN activity and star formation in galaxies do appear to have a common triggering mechanism, at least in a statistical sense, within the COSMOS sample we do not find strong evidence of any 'smoking gun' signaling powerful AGN influence on the star-forming properties of their hosts galaxies.

Published
2012

50. Measuring Home Broadband Performance

Author

Renata Teixeira, Walter de Donato, Srikanth Sundaresan, Nick Feamster, Antonio Pescape, Sam Crawford, College of Computing (GATECH), Georgia Institute of Technology [Atlanta], University of Naples Federico II = Università degli studi di Napoli Federico II, Laboratory of Information, Network and Communication Sciences (LINCS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institut Mines-Télécom [Paris] (IMT), Networks and Performance Analysis (NPA), Laboratoire d'Informatique de Paris 6 (LIP6), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), SamKnows, Università degli studi di Napoli Federico II, S., Sundaresan, DE DONATO, Walter, N., Feamster, R., Teixeira, S., Crawford, and Pescape', Antonio

Subjects
business.product_category, Integrated access device, Access network, General Computer Science, business.industry, Computer science, 020206 networking & telecommunications, Throughput, 02 engineering and technology, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], 020204 information systems, Broadband, 0202 electrical engineering, electronic engineering, information engineering, Internet access, Telecommunications, business, Juniper E-Series, Computer network
Abstract

We present the results from the first study of Internet access link performance measured directly from home routers. In conjunction with the Federal Communication Commission's study of broadband Internet access in the United States, we investigate the throughput and latency of network access links from about 4000 routers across eight ISPs. Our findings provide a snapshot of access network performance across the United States, offer insights on how access network performance should be measured and presented to users, and inform various ongoing efforts to evaluate the performance of access networks around the world.

Published
2012

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