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10,440 results on '"Centrale Lille"'

1. On the fatigue crack growth resistance of aluminum matrix composites reinforced by shape memory alloys

Author: UCL - SST/IMMC/IMAP - Materials and process engineering, Huazhong University of Science and Technology - Department of Mechanics, École Polytechnique, Palaiseau - n/a, Univ. Lille, CNRS, Centrale Lille - Laboratoire de Mécanique, Multiphysique et Multiéchelle, Gomes Affonseca Netto, Nelson, Zhao, Lv, Charkaluk, Eric, Hosdez, Jérôme, Simar, Aude, ESAFORM2021, UCL - SST/IMMC/IMAP - Materials and process engineering, Huazhong University of Science and Technology - Department of Mechanics, École Polytechnique, Palaiseau - n/a, Univ. Lille, CNRS, Centrale Lille - Laboratoire de Mécanique, Multiphysique et Multiéchelle, Gomes Affonseca Netto, Nelson, Zhao, Lv, Charkaluk, Eric, Hosdez, Jérôme, Simar, Aude, and ESAFORM2021
Abstract: Particulate reinforcements are widely used in aluminum alloys to increase their strength. However, it can also be used to enhance fatigue crack resistance. In the field of metal matrix composites (MMC), shape memory alloys (SMAs), when used as reinforcements, allow tailoring the damage mechanisms due to their shape memory effect (SME). The SME can be used to generate local internal stresses in the vicinity of reinforcements, allowing to attract or repel the crack during its propagation. Therefore, the mechanism of crack deviation will postpone the final failure. In the present work, nitinol (NiTi) particles were used as reinforcements for Al7075, and the Al7075/NiTi composites were manufactured via Friction Stir Processing (FSP). FSP allows to homogeneously distribute the reinforcements in the aluminum matrix and mitigate interfacial intermetallic formation. The SME was obtained through a pre-straining, followed by a heat treatment. The analysis of fatigue crack growth (FCG) tests confirms the enhancement of crack resistance by deviation and branching in the presence of internal stresses. Moreover, digital image correlation (DIC) analysis allows for understanding of the plasticity and damage mechanism that occurs at the crack tip during its propagation.
Published: 2021

2. REALCAT: A new platform to bring catalysis to the lightspeed

Author: Centrale Lille, Université Lille 2 Droit et Santé, European Commission, Agence Nationale de la Recherche (France), Paul, Sèbastien, Heyte, Svetlana, Katryniok, Benjamin, García Sancho, Cristina, Maireles-Torres, Pedro, Dumeignil, F., Centrale Lille, Université Lille 2 Droit et Santé, European Commission, Agence Nationale de la Recherche (France), Paul, Sèbastien, Heyte, Svetlana, Katryniok, Benjamin, García Sancho, Cristina, Maireles-Torres, Pedro, and Dumeignil, F.
Abstract: [EN]: Catalysis, irrespective of its form can be considered as one of the most important pillars of today’s chemical industry. The development of new catalysts with improved performances is therefore a highly strategic issue. However, the a priori theoretical design of the best catalyst for a desired reaction is not yet possible and a time- and money-consuming experimental phase is still needed to develop a new catalyst for a given reaction. The REALCAT platform described in this paper consists in a complete, unique, integrated and top-level high-throughput technologies workflow that allows a significant acceleration of this kind of research. This is illustrated by some preliminary results of optimizationof the operating conditions of glycerol dehydration to acrolein over an heteropolyacid-based supported catalyst. It is shown that using REALCAT high-throughput tools a more than 10-fold acceleration of the operating conditions optimization process is obtained., [FR]: La catalyse, quelle que soit sa forme, peut être considérée comme un des plus importants piliers de l’industrie chimique. Le développement de nouveaux catalyseurs aux propriétés catalytiques améliorées est ainsi d’une importance stratégique capitale. À ce jour la catalyse n’est pas une science prédictive et la conception théorique d’un catalyseur pour une réaction donnée n’est pas encore possible et une approche expérimentale consommatrice en temps et en ressource est nécessaire. La plateforme REALCAT décrite dans cet article consiste en un ensemble complet, intégré et unique au monde d’équipements de criblage permettant une accélération significative de la recherche dans le domaine de la catalyse. Un premier exemple d’optimisation des conditions opératoires de la déshydratation du glycérol en acroléine sur catalyseur hétéropolyanionique est donné à titre d’illustration. Il montre que les outils de la plateforme REALCAT permettent de réduire par au moins un facteur 10 le temps d’optimisation des conditions opératoires de la réaction étudiée
Published: 2015

3. Bus network decomposition for fault detection and isolation through power line communication

Author: Abdel Karim Abdel Karim, M. Amine Atoui, Virginie Degardin, Pierre Laly, Vincent Cocquempot, Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Télécommunication, Interférences et Compatibilité Electromagnétique - IEMN (TELICE - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Plateforme de Caractérisation Multi-Physiques - IEMN (PCMP - IEMN), This research work is done in the framework of the ELSAT2020 project which is co-financed by the European Union with the European Regional Development Fund, the French state and the Hauts-de-France Region Council, and PCMP C2EM
Subjects: Network decomposition, Applied Mathematics, Fault isolation, [SPI.TRON]Engineering Sciences [physics]/Electronics, Computer Science Applications, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Power line communication, Control and Systems Engineering, Residual, [INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering, Electrical and Electronic Engineering, Fault detection, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, Instrumentation
Abstract: International audience; This paper deals with fault detection and isolation (FDI) in complex embedded wired communication networks. The considered faults are soft faults which do not prevent the communication, but may evolve into hard faults, i.e. short or open circuit. A novel FDI method based on power line communication (PLC) transmission systems is proposed. In these PLC systems, the transmission coefficients between the source and each receiver are estimated for communication purposes using orthogonal frequency division multiplexing (OFDM). Health indicators and residuals are computed by comparing the online estimated transmission coefficients with the reference coefficients. A methodology for dealing with complex networks, such as bus networks, is proposed. It is based on the decomposition of the network into several Y-shaped sub-networks. Each of these sub-networks is monitored to detect the presence of a fault. The FDI method is first validated using real data extracted from a Y-shaped network test bench. Then, the proposed approach is validated on a more complex network using realistic simulated data.
Published: 2023

4. Small grains from Ryugu: handling and analysis pipeline for infrared synchrotron microspectroscopy

Author: Stefano Rubino, Zélia Dionnet, Alice Aléon-Toppani, Rosario Brunetto, Tomoki Nakamura, Donia Baklouti, Zahia Djouadi, Cateline Lantz, Obadias Mivumbi, Ferenc Borondics, Stephane Lefrançois, Christophe Sandt, Francesco Capitani, Eva Héripré, David Troadec, Megumi Matsumoto, Kana Amano, Tomoyo Morita, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Seiichiro Watanabe, Yuichi Tsuda, Institut d'astrophysique spatiale (IAS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Tohoku University [Sendai], Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), DISCO beamline, Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de mécanique des sols, structures et matériaux (MSSMat), CentraleSupélec-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Centrale de Micro Nano Fabrication - IEMN (CMNF - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Hokkaido University [Sapporo, Japan], Kyushu University, Hiroshima University, Japan Aerospace Exploration Agency [Sagamihara] (JAXA), Tokyo National University of Fine Arts and Music (Tokyo Geijutsu Daigaku) (GEIDAI), Nagoya University, This work has been funded by the CNES-France (Hayabusa2 mission) and by the ANR project CLASSY (Grant ANR-17-CE31-0004-02). The micro-spectroscopy measurements were supported by grants from Region Ile-de-France (DIM-ACAV) and SOLEIL., Renatech Network, CMNF, and ANR-17-CE31-0004,CLASSY,Composition des surfaces du Système Solaire de bas albédo(2017)
Subjects: [SPI]Engineering Sciences [physics]
Abstract: preprint: https://doi.org/10.21203/rs.3.rs-1622610/v2; International audience; Sample-return missions allow the study of materials collected directly from celestial bodies, unbiased by atmospheric entry effects and/or terrestrial alteration and contamination phenomena, using state-of-the-art techniques which are available only in a laboratory environment—but only if the collected material stays pristine. The scarcity of outer-space unaltered material recovered until now makes this material extremely precious for the potential scientific insight it can bring. To maximize the scientific output of current and future sample-return missions, the scientific community needs to plan for ways of storing, handling, and measuring this precious material while preserving their pristine state for as long as the ‘invasiveness’ of measurements allows. In July 2021, as part of the Hayabusa2 (JAXA) “Stone” preliminary examination team, we received several microscopic particles from the asteroid Ryugu, with the goal of performing IR hyper-spectral imaging and IR micro-tomography studies. Here, we describe the sample transfer, handling methods and analytical pipeline we implemented to study this very precious material while minimizing and surveilling their alteration history on Earth.
Published: 2023

5. Pressure-induced antiferromagnetic-tetragonal to nonmagnetic-collapse-tetragonal insulator-metal transition in ThMnAsN

Author: Smritijit Sen, Houria Kabbour, Haranath Ghosh, Université de Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS], Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), ANR-16-IDEX-0004,ULNE,ULNE(2016), and ANR-21-CE08-0051,MultiPhos,Reseau polyanionique pour des propriétés multiferoiques(2021)
Subjects: Condensed Matter - Materials Science, Condensed Matter::Materials Science, Mechanics of Materials, Mechanical Engineering, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Condensed Matter::Strongly Correlated Electrons, General Materials Science, [CHIM.INOR]Chemical Sciences/Inorganic chemistry
Abstract: We report first principles numerical discovery of hydrostatic pressure driven tetragonal to collapsed tetragonal transition in 1111-type material ThMnAsN accompanied by simultaneous magneto-structural, insulator to metal transition together with complete collapse of Mn moment. We present detailed evolution of various structural parameters, magnetism and electronic structures of ThMnAsN with increasing hydrostatic pressure. All the structural parameters show anomalies at a critical pressure P$_c \sim$ 9 GPa; c-lattice parameter, out of plane As-As bond length, anion height (h$_{As}$) undergo drastic modification compared to the in-plane parameters which is manifested in an iso-structural phase transition from tetragonal to a collapsed tetragonal (cT) phase. These modifications in "local structural correlations" due to pressure destroys usually localized nature of Mn moments and gets completely quenched. Apart from that the elastic constant, the electronic structures also bear the finger prints of insulator-metal and magneto-structural transition at higher pressures accompanying a total collapse of magnetic moment at the vicinity of 9 GPa. The critical value of the pressure P$_c$ at which tetragonal to collapse tetragonal phase transition occurs, remains robust with respect to the on-site Hubbard correlation (U). The dynamical stability of the compound at higher pressures are affirmed through detailed computations of phonon dispersion curves endowed with positive phonon frequency through out the Brillouin zone. The effect of magnetic spin structure on the electronic band structures are obtained through band unfolding. The electronic structure of ThMnAsN at higher pressures "orbital selectively" influences bands, band gap and closely resembles with the electronic structure of Fe-based superconductors with the occurrences of orbital selective Lifshitz transition., Comment: 13 pages, 21 figures
Published: 2023

6. Memristor-Based Cryogenic Programmable DC Sources for Scalable In Situ Quantum-Dot Control

Author: Pierre-Antoine Mouny, Yann Beilliard, Sébastien Graveline, Marc-Antoine Roux, Abdelouadoud El Mesoudy, Raphaël Dawant, Pierre Gliech, Serge Ecoffey, Fabien Alibart, Michel Pioro-Ladrière, Dominique Drouin, Institut Interdisciplinaire d'Innovation Technologique [Sherbrooke] [3IT], Laboratoire Nanotechnologies et Nanosystèmes [Sherbrooke] [LN2], Institut Quantique [Sherbrooke] [UdeS], Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN], Nanostructures, nanoComponents & Molecules - IEMN [NCM - IEMN], Institut Interdisciplinaire d'Innovation Technologique [Sherbrooke] (3IT), Université de Sherbrooke (UdeS), Laboratoire Nanotechnologies et Nanosystèmes [Sherbrooke] (LN2), Université de Sherbrooke (UdeS)-École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-École Supérieure de Chimie Physique Électronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut Quantique [Sherbrooke] (UdeS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Nanostructures, nanoComponents & Molecules - IEMN (NCM - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), ACKNOWLEDGMENTData Availability: The Python library that was developed to simulate the control performed by the proposed dc source is available at GitHub. Data supporting this work will be uploaded to an online repository.This work was supported in part by the Natural Sciences and Engineering Research Council of Canada(NSERC), in part by the Canada First Research Excellence Fund, in part by the Canada First Research Excellence Fund in part by Laboratoire Nanotechnologies Nanosystèmes (LN2), which is aFrench–Canadian Joint International Research Laboratory (IRL-3463), funded and co-operated by Centre National de la Recherche Scientifique (CNRS), Université de Sherbrooke, Université de Grenoble Alpes (UGA), École Centrale Lyon (ECL), and Institut National des Sciences Appliquées (INSA) Lyon, and and in part by the Fonds de Recherche du Québec Nature et Technologie (FRQNT).
Subjects: FOS: Computer and information sciences, Power dissipation, Quantum Physics, Cryogenics, Resistance, FOS: Physical sciences, Voltage, Logic gates, [SPI.TRON]Engineering Sciences [physics]/Electronics, Electronic, Optical and Magnetic Materials, Hardware Architecture (cs.AR), Qubit, Electrical and Electronic Engineering, Quantum Physics (quant-ph), Memristors, Computer Science - Hardware Architecture
Abstract: Current quantum systems based on spin qubits are controlled by classical electronics located outside the cryostat at room temperature. This approach creates a major wiring bottleneck, which is one of the main roadblocks toward truly scalable quantum computers. Thus, we propose a scalable memristor-based programmable DC source that could be used to perform biasing of quantum dots inside of the cryostat (i.e. in-situ). This novel cryogenic approach would enable to control the applied voltage on the electrostatic gates by programming the resistance of the memristors, thus storing in the latter the appropriate conditions to form the quantum dots. In this study, we first demonstrate multilevel resistance programming of a TiO2-based memristors at 4.2 K, an essential feature to achieve voltage tunability of the memristor-based DC source. We then report hardwarebased simulations of the electrical performance of the proposed DC source. A cryogenic TiO2-based memristor model fitted on our experimental data at 4.2 K was used to show a 1 V voltage range and 100 uV in-situ memristor-based DC source. Finally, we simulate the biasing of double quantum dots enabling sub-2 minutes in-situ charge stability diagrams. This demonstration is a first step towards more advanced cryogenic applications for resistive memories such as cryogenic control electronics for quantum computers.
Published: 2023

7. Private Sampling with Identifiable Cheaters

Author: Sabater, César, Hahn, Florian, Peter, Andreas, Ramon, Jan, Machine Learning in Information Networks (MAGNET), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), University of Twente, University of Oldenburg, Chair TIP project, ANR-20-CE23-0013,PMR,Recherche en Medicine respectant la vie Privée(2020), European Project: 101070038,TRUMPET, and Machine Learning in Information Networks [MAGNET]
Subjects: sampling, Cybersecurity, differential privacy, zero knowledge proofs, multiparty computation, [INFO.INFO-LG]Computer Science [cs]/Machine Learning [cs.LG], Horizon Europe, General Earth and Planetary Sciences, Private Sampling, General Environmental Science
Abstract: International audience; In this paper we study verifiable sampling from probability distributions in the context of multi-party computation. This has various applications in randomized algorithms performed collaboratively by parties not trusting each other. One example is differentially private machine learning where noise should be drawn, typically from a Laplace or Gaussian distribution, and it is desirable that no party can bias this process. In particular, we propose algorithms to draw random numbers from uniform, Laplace, Gaussian and arbitrary probability distributions, and to verify honest execution of the protocols through zero-knowledge proofs. We propose protocols that result in one party knowing the drawn number and protocols that deliver the drawn random number as a shared secret.
Published: 2023

8. Advances on Microsupercapacitors: Real Fast Miniaturized Devices toward Technological Dreams for Powering Embedded Electronics?

Author: Pascal Roussel, Christophe Lethien, Khac Huy Dinh, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Circuits Systèmes Applications des Micro-ondes - IEMN (CSAM - IEMN ), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Réseau sur le stockage électrochimique de l'énergie (RS2E), Aix Marseille Université (AMU)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Collège de France (CdF (institution))-Université de Picardie Jules Verne (UPJV)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA)-Nantes Université (Nantes Univ)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), Université de Montpellier (UM), This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement no. 847568. The authors thank the French National Research Agency (STORE-EX Labex Project ANR-10-LABX-76-01). The French RENATECH network and the University of Lille are greatly acknowledged for supporting the Center of MicroNanoFabrication (CMNF) facility from IEMN., Renatech Network, ANR-10-LABX-0076,STORE-EX,Laboratory of excellency for electrochemical energy storage(2010), and European Project: 847568,H2020,H2020-MSCA-COFUND-2018,PEARL(2019)
Subjects: General Chemical Engineering, General Chemistry, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
Abstract: International audience; Electrochemical lithium (de)intercalation in an atomic layer deposited (ALD) TiO2 anatase thin film deposited on a planar Si /Al2O3/Pt substrate is investigated by Raman spectroscopy. An initial discharge capacity of 63 µAh cm−2 µm−1 (0.5 Li+ mole−1) is reached at C/10 rate, which increases up to 77 µAh cm−2 µm−1 upon further cycles. An excellent capacity retention is achieved over at least 100 cycles, showing the good adherence of the ALD thin film. Raman spectra of LixTiO2 (0 ≤ x ≤ 0.5) thin film electrodes point to the nucleation of the orthorhombic lithiated titanate (LT) Li0.5TiO2 phase from x = 0.1. This LT phase coexists with tetragonal TiO2 in the 0.1 ≤ x ≤ 0.4 composition domain to be pure for x = 0.5. A fully reversible transformation from orthorhombic LT to tetragonal TiO2 is observed upon the charge. The high quality of the Raman spectra allows identifying for the first time 12 modes in the 100–800 cm−1 region for the electrochemically formed LT phase. Furthermore, an appropriate Raman spectra analysis allows a reliable and quantitative determination of the thin film composition during discharge and charge. These results illustrate Raman spectroscopy is a powerful probe to scrutinize the Li insertion/extraction mechanism in TiO2 thin films.
Published: 2023

9. Hyperexponential and Fixed-Time Stability of Time-Delay Systems: Lyapunov–Razumikhin Method

Author: Artem N. Nekhoroshikh, Denis Efimov, Andrey Polyakov, Wilfrid Perruquetti, Igor B. Furtat, National Research University of Information Technologies, Mechanics and Optics [St. Petersburg] (ITMO), Finite-time control and estimation for distributed systems (VALSE), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institute of Mechanical Engineering Problems [St. Petersburg] (IPME), Russian Academy of Sciences [Moscow] (RAS), and The results of Section IV are supported by the Russian Science Foundation under grant no. 18-79-10104 (https://rscf.ru/en/project/18-79-10104/) at IPME RAS. The results of Section V are supported by the Russian Science Foundation under grant no. 21-71-10032 at ITMO University.
Subjects: implicit theorem, Lyapunov-Razumikhin theorem, Control and Systems Engineering, Fixed-time and hyperexponential stability, ComputingMethodologies_SYMBOLICANDALGEBRAICMANIPULATION, Electrical and Electronic Engineering, linear matrix inequalities, time-delay systems, [SPI.AUTO]Engineering Sciences [physics]/Automatic, Computer Science Applications
Abstract: International audience; Razumikhin-like theorems on hyperexponential and fixed-time stability of time-delay systems are proposed for both explicitly and implicitly defined Lyapunov functions. While the former method is useful for stability analysis, the latter approach is more suitable for control synthesis. Examples of systems that can be stabilized hyperexponentially and in fixed time are given. The control parameters tuning algorithm is presented in the form of linear matrix inequalities. The numerical simulations illustrate the theoretical results.
Published: 2023

10. On Stability of Homogeneous Systems in Presence of Parasitic Dynamics

Author: Jesus Mendoza-Avila, Denis Efimov, Leonid Fridman, Jaime A. Moreno, Finite-time control and estimation for distributed systems (VALSE), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), ITMO University [Russia], Facultad de Ingeniería, Universidad Nacional Autónoma de México = National Autonomous University of Mexico (UNAM), This work was supported in part by Homogeneity Tools for Sliding Mode Control and Estimation (HoTSMoCE) INRIA associate team program, by CONACyT (Consejo Nacional de Ciencia y Tecnologia) project 241171, 282013 and CVU 711867, by PAPIIT-UNAM (Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica) IN 115419 and IN 113617., Finite-time control and estimation for distributed systems [VALSE], and Universidad Nacional Autónoma de México = National Autonomous University of Mexico [UNAM]
Subjects: Singular Perturbations, Control and Systems Engineering, Chattering Analysis, Homogeneity, Electrical and Electronic Engineering, Interconnected Systems, Computer Science Applications, [SPI.AUTO]Engineering Sciences [physics]/Automatic
Abstract: International audience; Usually, singularly perturbed models are used to justify the decomposition of the interconnected systems into the Main Dynamics (MD) and the Parasitic Dynamics (PD). In this paper, the effect of a homogeneous PD on the stability of a homogeneous MD, when Homogeneity Degrees (HD) are possibly different, is studied via ISS approach in the framework of singular perturbations. Thus, the possibilities to reduce the order of the interconnected system considering only Reduced-Order Dynamics (ROD) and neglecting PD are examined. Proposed analysis discovers three kinds of stability in the behavior of such an interconnection by assuming that both, ROD and unforced PD, are Globally Asymptotically Stable (GAS). In the first case, when the HD of both systems coincide and the Singular Perturbation Parameter (SPP) is small enough, GAS of the interconnection can be concluded. In the second case, when the HD of ROD is greater, only local stability of interconnection can be ensured. Moreover, proposed approach allows to estimate the domain of attraction for the trajectories of the interconnection as a function of the SPP. In the third case, when the HD of ROD is smaller than the HD of PD, only practical stability can be concluded, and a kind of chattering phenomenon can arise when the HD of ROD is negative. Furthermore, the asymptotic bound of the system's trajectories is also estimated in terms of the SPP.
Published: 2023

11. Core SBML and its Formal Semantics

Author: Niehren, Joachim, Lhoussaine, Cédric, Vaginay, Ahténaïs, BioComputing, Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Linking Dynamic Data (LINKS), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Laboratoire Lorrain de Recherche en Informatique et ses Applications (LORIA), Institut National de Recherche en Informatique et en Automatique (Inria)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), ANR-21-CE45-0017,MIGAD,Modélisation de l'absorption intestinale de glucose dans le diabète(2021), Linking Dynamic Data [LINKS], and Laboratoire Lorrain de Recherche en Informatique et ses Applications [LORIA]
Subjects: [SCCO.COMP]Cognitive science/Computer science
Abstract: International audience; The systems biology markup language (SBML) permits to represent biological models mixing reaction networks, algebraic equations, differential equations, and events. Its main objective is to exchange biological models between various tools for simulation and analysis. Such tools are, for example, Copasi, BioCham, CellDesigner, as well as more general-purpose languages such as Julia. While an XML schema formally defines the concrete syntax of SBML, there is no formal semantics. This makes it often difficult to understand the models and to design and implement correct and general interfaces from and to SBML, i.e., to use SBML as an exchange formalism for systems biology. In the present paper, we propose Core SBML, a novel language covering a large subset of SBML with clear formal semantics. Besides giving a formal definition, we define an XML syntax for Core SBML by an XML schema. We then present a compiler of a large fragment of SBML to Core SBML. We also distinguish a fragment of Core SBML with a provably correct compiler to BioCham.
Published: 2023

12. Nanoscale electronic transport at graphene/pentacene van der Waals interfaces

Author: Michel Daher Mansour, Jacopo Oswald, Davide Beretta, Michael Stiefel, Roman Furrer, Michel Calame, Dominique Vuillaume, Nanostructures, nanoComponents & Molecules - IEMN [NCM - IEMN], Swiss Federal Laboratories for Materials Science and Technology [Dübendorf] [EMPA], Nanostructures, nanoComponents & Molecules - IEMN (NCM - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), and Swiss Federal Laboratories for Materials Science and Technology [Dübendorf] (EMPA)
Subjects: [PHYS]Physics [physics], Condensed Matter - Mesoscale and Nanoscale Physics, graphene, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), conductive-AFM, FOS: Physical sciences, pentacene, Van der Waals, General Materials Science, electron transport, molecular junction
Abstract: We report a study on the relationship between structure and electron transport properties of nanoscale graphene/pentacene interfaces. We fabricated graphene/pentacene interfaces from 10-30 nm thick needle-like pentacene nanostructures down to two-three layers (2L-3L) dendritic pentacene islands, and we measured their electron transport properties by conductive atomic force microscopy (C-AFM). The energy barrier at the interfaces, i.e. the energy position of the pentacene highest occupied molecular orbital (HOMO) with respect to the Fermi energy of the graphene and the C-AFM metal tip, are determined and discussed with the appropriate electron transport model (double Schottky diode model and Landauer-Buttiker model, respectively) taking into account the voltage-dependent charge doping of graphene. In both types of samples, the energy barrier at the graphene/pentacene interface is slightly larger than that at the pentacene/metal tip interface, resulting in 0.47-0.55 eV and 0.21-0.34 eV, respectively, for the 10-30 nm thick needle-like pentacene islands, and in 0.92-1.44 eV and 0.67-1.05 eV, respectively, for the 2L-3L thick dendritic pentacene nanostructures. We attribute this difference to the molecular organization details of the pentacene/graphene heterostructures, with pentacene molecules lying flat on the graphene in the needle-like pentacene nansotructures, while standing upright in 2L-3L dendritic islands, as observed from Raman spectroscopy., Comment: Paper and its supplementary information
Published: 2023

13. Grain growth of NpO2 and UO2 nanocrystals

Author: Viktoria Baumann, Karin Popa, Marco Cologna, Murielle Rivenet, Olaf Walter, Université de Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, European Commission - Joint Research Centre [Karlsruhe] [JRC], Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS], Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and European Commission - Joint Research Centre [Karlsruhe] (JRC)
Subjects: General Chemical Engineering, [CHIM.MATE]Chemical Sciences/Material chemistry, General Chemistry
Abstract: International audience; We report on the crystallite growth of nanometric NpO2 and UO2 powders. The AnO2 nanoparticles (An = U and Np) were synthesized by hydrothermal decomposition of the corresponding actinide(IV) oxalates. NpO2 powder was isothermally annealed between 950 °C and 1150 °C and UO2 between 650 °C and 1000 °C. The crystallite growth was then followed by high-temperature X-ray diffraction (HT-XRD). The activation energies for the growth of crystallites of UO2 and NpO2 were determined to be 264(26) kJ mol−1 and 442(32) kJ mol−1, respectively, with a growth exponent n = 4. The value of the exponent n and the low activation energy suggest that the crystalline growth is rate-controlled by the mobility of the pores, which migrate by atomic diffusion along the pore surfaces. We could thus estimate the cation self-diffusion coefficient along the surface in UO2, NpO2 and PuO2. While data for surface diffusion coefficients for NpO2 and PuO2 are lacking in the literature, the comparison with literature data for UO2 supports further the hypothesis of a surface diffusion controlled growth mechanism.
Published: 2023

14. Energetically optimal finite-time stabilization of generalized homogeneous linear systems

Author: Andrey Polyakov, Denis Efimov, Xubin Ping, Finite-time control and estimation for distributed systems [VALSE], Xidian University, Finite-time control and estimation for distributed systems (VALSE), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), and Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)
Subjects: nonlinear control, stability of nonlinear systems, optimal control, Control and Systems Engineering, [INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering, Electrical and Electronic Engineering, Computer Science Applications
Abstract: International audience; The problem of finite-time stabilization of a linear plant with an optimization of both a settling time and an averaged/weighted control energy is studied using the concept of generalized homogeneity. It is shown that the optimal finite-time stabilizing control in this case can be designed by means of solving a simple linear algebraic equation. Robustness of the obtained control law is studied.
Published: 2023

15. Limits of multi-relational graphs

Author: Juan Alvarado, Yuyi Wang, Jan Ramon, Catholic University of Leuven - Katholieke Universiteit Leuven [KU Leuven], Machine Learning in Information Networks [MAGNET], Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Department of Computer Science [ETH Zürich] (D-INFK), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Machine Learning in Information Networks (MAGNET), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), and Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)
Subjects: ACM: I.: Computing Methodologies/I.2: ARTIFICIAL INTELLIGENCE, ACM: G.: Mathematics of Computing/G.2: DISCRETE MATHEMATICS/G.2.2: Graph Theory, [STAT.ML]Statistics [stat]/Machine Learning [stat.ML], [MATH.MATH-ST]Mathematics [math]/Statistics [math.ST], Large multigraph, Graphon Theory, Markov Logic Network, Large Deviation Principle, Artificial Intelligence, [PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], Software, [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI]
Abstract: International audience; Graphons are limits of large graphs. Motivated by a theoretical problem from statistical relational learning, we develop a generalization of basic results from graphon theory into the "multi-relational" setting. We show that their multi-relational counterparts, which we call multi-relational graphons, are analogically limits of large multi-relational graphs. We extend the cutdistance topology for graphons to multi-relational graphons and prove its compactness and the density of multi-relational graphs in this topology. In turn, compactness enables to prove the large deviation principle for Multi-Relational Graphs (LDP) which enables to prove the most typical random graphs constrained by marginal statistics converge asymptotically to constrained multirelational graphons with maximum entropy. We show the equivalence between a restricted version of Markov Logic Network and Multi-Relational Graphons with maximum entropy.
Published: 2022

16. Parallel faceted imaging in radio interferometry via proximal splitting (Faceted HyperSARA): I. Algorithm and simulations

Author: Pierre-Antoine Thouvenin, Abdullah Abdulaziz, Arwa Dabbech, Audrey Repetti, Yves Wiaux, Centrale Lille, Université de Lille, Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Heriot-Watt University [Edinburgh] (HWU), Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 [CRIStAL], and Heriot-Watt University [Edinburgh] [HWU]
Subjects: Signal Processing (eess.SP), Image processing, Radio interferometry imaging, Image and Video Processing (eess.IV), FOS: Physical sciences, Astronomy and Astrophysics, Electrical Engineering and Systems Science - Image and Video Processing, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Space and Planetary Science, FOS: Electrical engineering, electronic engineering, information engineering, Electrical Engineering and Systems Science - Signal Processing, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract: Upcoming radio interferometers are aiming to image the sky at new levels of resolution and sensitivity, with wide-band image cubes reaching close to the Petabyte scale for SKA. Modern proximal optimization algorithms have shown a potential to significantly outperform CLEAN thanks to their ability to inject complex image models to regularize the inverse problem for image formation from visibility data. They were also shown to be parallelizable over large data volumes thanks to a splitting functionality enabling the decomposition of the data into blocks, for parallel processing of block-specific data-fidelity terms involved in the objective function. Focusing on intensity imaging, the splitting functionality is further exploited in this work to decompose the image cube into spatio-spectral facets, and enable parallel processing of facet-specific regularization terms in the objective function, leading to the "Faceted HyperSARA" algorithm. Reliable heuristics enabling an automatic setting of the regularization parameters involved in the objective are also introduced, based on estimates of the noise level, transferred from the visibility domain to the domains where the regularization is applied. Simulation results based on a MATLAB implementation and involving synthetic image cubes and data close to Gigabyte size confirm that faceting can provide a major increase in parallelization capability when compared to the non-faceted approach (HyperSARA)., To appear in MNRAS
Published: 2022

17. Trapping Effect in AlInN/GaN HEMTs: A Study Based on Photoionization and Pulsed Electrical Measurements

Author: R. Strenaer, Y. Guhel, C. Gaquiere, B. Boudart, Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Puissance - IEMN (PUISSANCE - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), and This work was supported in part by the PLACENANO Research Project and in part by the Normandy County Council, the European Union within the framework of the Operational Program under Grant N18E01664/18P02478
Subjects: 20 pulsed electrical measurements, [SPI]Engineering Sciences [physics], trapping effect, AlInN/GaN transistors, Electrical and Electronic Engineering, photoionization, Electronic, Optical and Magnetic Materials
Abstract: International audience; The aim of this article is to detect electron traps in AlInN/GaN transistors operating at room temperature by combining pulsed electrical measurement with photoionization techniques to rapidly assess their activation energies and time constants. In addition, this technique can also reveal the presence of electron traps that cannot be observed by using pulsed measurements alone. Thus, two electron traps were identified including a deep level whose origin could be related to dislocations in the GaN buffer existing in the devices. At the same time, this study has shown that the time constants of these electron traps are inferior to 400 ns and that the electrical behavior of the components is also degraded by the presence of surface states with a time constant of 4 μ s. Moreover, these two traps are at the origin of the gate lag effects observed during the pulsed electrical characterization of the AlInN/GaN high electron mobility transistors (HEMTs). Likewise, a negative output conductance induced by a trapping effect has been put forward.
Published: 2022

18. Optimization of CdZnyS1−y Buffer Layer Properties for a ZnO/CZTSxSe1−x/Mo Solar Cell to Enhance Conversion Efficiency

Author: Boubakeur, M., Aissat, A., Chenini, L., Arbia, M. Ben, Maaref, H., Vilcot, Jean-Pierre, Faculté De Technologie Blida1, Université Saâd Dahlab Blida 1 (UB1), Université de Monastir - University of Monastir (UM), Laboratoire de Micro-optoélectronique et Nanostructures [Monastir], Faculté des Sciences de Monastir (FSM), Université de Monastir - University of Monastir (UM)-Université de Monastir - University of Monastir (UM), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Optoélectronique - IEMN (OPTO - IEMN), INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), and no information
Subjects: solar cell, [SPI]Engineering Sciences [physics], New materials, thin film, Materials Chemistry, semiconductors, Electrical and Electronic Engineering, Condensed Matter Physics, optoelectronic, Electronic, Optical and Magnetic Materials
Abstract: International audience
Published: 2022

19. On Computer Mouse Pointing Model Online Identification and Endpoint Prediction

Author: Anatolii Khalin, Rosane Ushirobira, Denis Efimov, Gery Casiez, Finite-time control and estimation for distributed systems (VALSE), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Technology and knowledge for interaction (LOKI)
Subjects: Human-Computer Interaction, Artificial Intelligence, Computer Networks and Communications, Control and Systems Engineering, Signal Processing, Human Factors and Ergonomics, [SPI.AUTO]Engineering Sciences [physics]/Automatic, Computer Science Applications
Abstract: International audience; This paper proposes a new simplified pointing model as a feedback-based dynamical system, including both human and computer sides of the process. It takes into account the commutation between the correction and ballistic phases in pointing tasks. We use the mouse position increment signal from noisy experimental data to achieve our main objectives: to estimate the model parameters online and predict the task endpoint. Some estimation tools and validation results, applying linear regression techniques on the experimental data are presented. We also compare with a similar prediction algorithm to show the potential of our algorithm's implementation.
Published: 2022

20. Design of orthogonal filter banks using a multi-objective genetic algorithm for a speech coding scheme

Author: Boukhobza, Abdelkader, Taleb, Nasreddine, Taleb-Ahmed, Abdelmalik, Bounoua, Abdennacer, Université Hassiba Ben Bouali de Chlef (UHBC), Université Djilali Liabès [Sidi-Bel-Abbès], Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), COMmunications NUMériques - IEMN (COMNUM - IEMN), INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), and The research being reported in this publication was supported by the Algerian Directorate General for Scientific Research and Technological Development (DGRSDT).
Subjects: [SPI]Engineering Sciences [physics], NSGAIII algorithm, Orthogonal filter banks, Speech coding, Discrete wavelet transform, General Engineering, Optimized wavelet, TA1-2040, Engineering (General). Civil engineering (General)
Abstract: International audience; In this work, we propose an optimization scheme based on a multi-objective Genetic Algorithm (GA) for the design of orthogonal filter banks for speech compression. A parameterization is adopted to assure that the resulting filter banks satisfy perfect reconstruction and have at least two vanishing moments. We search for a parameter set that optimizes the coding gain and the frequency selectivity. As the objectives are conflicting, we investigate the solution that realizes the best compromise between the objectives criteria using the Non-dominated Sorting Genetic Algorithm (NSGAIII). Experimental results have shown that the optimized filter banks provide a significant gain in coding performances when comparing with the Daubechies orthogonal filter banks for test speech signals.
Published: 2022

21. Improvement of CNN-Based Anisotropic Magnetostatic Field Computation via Adaptive Data Subset Selection

Author: Ruohan Gong, Zuqi Tang, L2EP - Équipe Outils et Méthodes Numériques (OMN), Laboratoire d’Électrotechnique et d’Électronique de Puissance - ULR 2697 (L2EP), Centrale Lille-Université de Lille-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Arts et Métiers Sciences et Technologies, Université catholique de Lille (UCL)-Université catholique de Lille (UCL), and ANR-20-CE42-0009,WISSTITWIN,Devloppement de technologies miniaturisées de capteurs SAW multiparamétres pour l'implementation du jumeau numérique des machines électriques.(2020)
Subjects: [PHYS]Physics [physics], [SPI]Engineering Sciences [physics], Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials
Abstract: International audience; A numerical issue arises when we extend the convolutional neural network (CNN) U-net to the anisotropic magnetostatic field computation. The output magnetic field has a significant gradient with respect to the input geometry parameter, which introduces inevitable errors in the training process to degrade the performance of deep learning (DL). To address this issue, the subset selection approach is utilized to divide the whole database into several subsets, where the samples are assigned according to the gradient between the input and output. Then these subsets with different sample densities are combined into a global one. Taking the uniform dataset with the same sample size as a comparison, the influence of subset selection on DL is investigated by comparing the performance of CNN on different datasets. Numerical experiments illustrate that the adaptive subset selection can be employed to improve the accuracy and efficiency of the CNN network.
Published: 2022

22. Error Estimator for Cauer Ladder Network Representation

Author: Shingo Hiruma, Stephane Clenet, Hajime Igarashi, Thomas Henneron, Hokkaido University [Sapporo, Japan], L2EP - Équipe Outils et Méthodes Numériques (OMN), Laboratoire d’Électrotechnique et d’Électronique de Puissance - ULR 2697 (L2EP), Centrale Lille-Université de Lille-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Arts et Métiers Sciences et Technologies, and Université catholique de Lille (UCL)-Université catholique de Lille (UCL)
Subjects: [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Error estimation, Electrical and Electronic Engineering, Sciences de l'ingénieur, Model order reduction (MOR), Cauer ladder network (CLN), Maxwell’s equations, Electronic, Optical and Magnetic Materials
Abstract: International audience; The Cauer Ladder Network (CLN) method enables to construct a reduced based circuit model of analytical or numerical models, e.g. Finite Element (FE) model, under quasistatic approximation. This paper proposes an estimator which provides guaranteed upper bounds of the truncation error due to the CLN method. The error estimator is tested on an analytical model and a Finite Element model to validate the approach.
Published: 2022

23. Exactly Solving Hard Permutation Flowshop Scheduling Problems on Peta-Scale GPU-Accelerated Supercomputers

Author: Jan Gmys, Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Optimisation de grande taille et calcul large échelle (BONUS), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), and Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)
Subjects: Branch-and-Bound, [INFO.INFO-DS]Computer Science [cs]/Data Structures and Algorithms [cs.DS], Permutation flow-shop scheduling, General Engineering, Supercomputing, [INFO.INFO-RO]Computer Science [cs]/Operations Research [cs.RO], GPU computing, [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC]
Abstract: International audience; Makespan minimization in permutation flow-shop scheduling is a well-known hard combinatorial optimization problem. Among the 120 standard benchmark instances proposed by E. Taillard in 1993, 23 have remained unsolved for almost three decades. In this paper, we present our attempts to solve these instances to optimality using parallel Branch-and-Bound (BB) on the GPU-accelerated Jean Zay supercomputer. We report the exact solution of 11 previously unsolved problem instances and improved upper bounds for eight instances. The solution of these problems requires both algorithmic improvements and leveraging the computing power of peta-scale high-performance computing platforms. The challenge consists in efficiently performing parallel depth-first traversal of a highly irregular and fine-grained search tree on distributed systems composed of hundreds of massively parallel accelerator devices and multicore processors. We present and discuss the design and implementation of our permutation-based BB and experimentally evaluate its parallel performance on up to 384 V100 GPUs (2 million CUDA cores) and 3840 CPU cores. The optimality proof for the largest solved instance requires about 64 CPU-years of computation—using 256 GPUs and over 4 million parallel search agents, the traversal of the search tree is completed in 13 hours, exploring 339 × 10$^1$$^2$ nodes.
Published: 2022

24. GAP: Differentially Private Graph Neural Networks with Aggregation Perturbation

Author: Sajadmanesh, Sina, Shahin Shamsabadi, Ali, Bellet, Aurélien, Gatica-Perez, Daniel, IDIAP Research Institute, Ecole Polytechnique Fédérale de Lausanne (EPFL), The Alan Turing Institute, Machine Learning in Information Networks (MAGNET), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), ANR-20-CE23-0015,PRIDE,Apprentissage automatique décentralisé et préservant la vie privée(2020), Ecole Polytechnique Fédérale de Lausanne [EPFL], and Machine Learning in Information Networks [MAGNET]
Subjects: FOS: Computer and information sciences, Computer Science - Machine Learning, Computer Science - Cryptography and Security, [INFO.INFO-LG]Computer Science [cs]/Machine Learning [cs.LG], [STAT.ML]Statistics [stat]/Machine Learning [stat.ML], Cryptography and Security (cs.CR), Machine Learning (cs.LG)
Abstract: In this paper, we study the problem of learning Graph Neural Networks (GNNs) with Differential Privacy (DP). We propose a novel differentially private GNN based on Aggregation Perturbation (GAP), which adds stochastic noise to the GNN's aggregation function to statistically obfuscate the presence of a single edge (edge-level privacy) or a single node and all its adjacent edges (node-level privacy). Tailored to the specifics of private learning, GAP's new architecture is composed of three separate modules: (i) the encoder module, where we learn private node embeddings without relying on the edge information; (ii) the aggregation module, where we compute noisy aggregated node embeddings based on the graph structure; and (iii) the classification module, where we train a neural network on the private aggregations for node classification without further querying the graph edges. GAP's major advantage over previous approaches is that it can benefit from multi-hop neighborhood aggregations, and guarantees both edge-level and node-level DP not only for training, but also at inference with no additional costs beyond the training's privacy budget. We analyze GAP's formal privacy guarantees using R\'enyi DP and conduct empirical experiments over three real-world graph datasets. We demonstrate that GAP offers significantly better accuracy-privacy trade-offs than state-of-the-art DP-GNN approaches and naive MLP-based baselines. Our code is publicly available at https://github.com/sisaman/GAP., Comment: Accepted at USENIX Security '23
Published: 2023
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25. High Breakdown Voltage GaN Schottky Diodes for THz Frequency Multipliers

Author: G. Di Gioia, E. Frayssinet, M. Samnouni, V. Chinni, P. Mondal, J. Treuttel, X. Wallart, M. Zegaoui, G. Ducournau, Y. Roelens, Y. Cordier, M. Zaknoune, Advanced NanOmeter DEvices - IEMN (ANODE - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA), 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)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), EPItaxie et PHYsique des hétérostructures - IEMN (EPIPHY - IEMN), LERMA Cergy (LERMA), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Photonique THz - IEMN (PHOTONIQUE THZ - IEMN), This work was supported by the French ANR (Agence Nationale de la Recherche), under the CE24 ‘SchoGAN’ project. This work was also supported by the CPER 'Photonics for Society', the CPER 'WAVETECH', and the Hauts de France Regional Council and the French Network RENATECH, Renatech Network, and ANR-17-CE24-0034,SchoGaN,Diodes Schottky GaN pour la génération de signaux THz(2017)
Subjects: wide band gap semiconductor, Materials Chemistry, Schottky diode, frequency multipliers, THz, Electrical and Electronic Engineering, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, GaN, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract: International audience; Quasi-vertical gallium nitride (GaN) Schottky diodes on silicon carbide (SiC) substrates were fabricated for frequency multiplier applications. The epitaxial structure employed had an n− layer of 590 nm with doping 6.6 × 1016 cm−3, while the n+ layer was 950 nm thick, with doping 2 × 1019 cm−3. Potassium hydroxide (KOH) chemical surface treatment before Schottky contact metallization was employed to study its effect in improving the diode parameters. The KOH-treated diode demonstrated a breakdown voltage of − 27.5 V, which is the highest reported for this type of diode. Cut-off frequencies around 500 GHz were obtained at high reverse bias (− 25 V) in spite of high series resistance. The result obtained in breakdown voltage value warrants further research in surface treatment and post-annealing of the Schottky contact optimization in order to decrease the series resistance.
Published: 2023

26. Saturated long chain fatty acids as possible natural alternative antibacterial agents: opportunities and challenges

Author: Arellano, Helena, Nardello-Rataj, Véronique, Szunerits, Sabine, Boukherroub, Rabah, Fameau, Anne-Laure, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), NanoBioInterfaces - IEMN (NBI - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Unité Matériaux et Transformations - UMR 8207 (UMET), Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and no information
Subjects: Long chain saturated fatty-acids, [SPI]Engineering Sciences [physics], Formulation, Nanotechnology, Self-assembly, Antibacterial lipids
Abstract: International audience; The spread of new strains of antibiotic-resistant pathogenic microorganisms has led to the urgent need to discover and develop new antimicrobial systems. The antibacterial effects of fatty acids have been well-known and recognized since the first experiments of Robert Koch in 1881, and they are now used in diverse fields. Fatty acids can prevent the growth and directly kill bacteria by insertion into their membrane. For that, a sufficient amount of fatty acid molecules has to be solubilized in water to transfer from the aqueous phase to the cell membrane. Due to conflicting results in the literature and lack of standardization methods, it is very difficult to draw clear conclusions on the antibacterial effect of fatty acids. Most of the current studies link fatty acids' effectiveness against bacteria to their chemical structure, notably the alkyl chain length and the presence of double bonds in their chain. Furthermore, the solubility of fatty acids and their critical aggregation concentration is not only related to their structure, but also influenced by medium conditions (pH, temperature, ionic strength, etc.). There is a possibility that the antibacterial activity of saturated long chain fatty acids (LCFA) may be underestimated due to the lack of water solubility and the use of unsuitable methods to assess their antibacterial activity. Thus, enhancing the solubility of these long chain saturated fatty acids is the main goal before examining their antibacterial properties. To increase their water solubility and thereby improve their antibacterial efficacy, novel alternatives may be considered, including the use of organic positively charged counter-ions instead of the conventional sodium and potassium soaps, the formation of catanionic systems, the mixture with co-surfactants, and solubilization in emulsion systems. This review summarizes the latest findings on fatty acids as antibacterial agents, with a focus on long chain saturated fatty acids. Additionally, it highlights the different ways to improve their water solubility, which may be a crucial factor in increasing their antibacterial efficacy. We finish with a discussion on the challenges, strategies and opportunities for the formulation of LCFAs as antibacterial agents.
Published: 2023

27. [Review] Graphene loaded with metal nanoparticles/complexes catalyzed cross-coupling reactions: A review

Author: Maryam Mirza-Aghayan, Amir Sepehr Moieni, Rabah Boukherroub, chemistry and chemical engineeting research center of Iran (CCERCI), CHEMISTRY AND CHEMICAL ENGINEERING, Islamic Azad University, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), NanoBioInterfaces - IEMN (NBI - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), and NONE FOUND
Subjects: Inorganic Chemistry, [PHYS]Physics [physics], Heterogeneous catalysis, Cross-coupling reactions, [SPI]Engineering Sciences [physics], Graphene-based nanocatalysts, Organic Chemistry, Materials Chemistry, Physical and Theoretical Chemistry, Carbon-carbon bond formation, Biochemistry
Abstract: International audience; AbstractVarious catalytic reactions under suitable conditions were used for the carbon-carbon (C-C) bond formation, such as the Kumada, Mizoroki-Heck, Sonogashira, Negishi, Stille, Suzuki-Miyaura, Hiyama, andFukuyama cross-coupling reactions. Supporting metal nanoparticles or complexes on functionalizedgraphene oxide (GO) or reduced graphene oxide (rGO) compounds provides new heterogeneous catalysts with enhanced aptitude for the formation of C-C bonds. This review highlights the applications ofmetal decorated on modified GO and rGO derivatives to form C-C bonds. We discuss briefly the generalmechanistic cycle of each reaction and the recent applications of the graphene-based nanocatalysts forthe coupling reactions, along the advantages of each catalyst.
Published: 2023

28. Introducing the TRUMPET project: TRUstworthy Multi-site Privacy Enhancing Technologies

Author: Pedrouzo-Ulloa, Alberto, Ramon, Jan, Duflot, Patrick, Pérez-González, Fernando, Lilova, Siyanna, Chihani, Zakaria, Gentili, Nicola, Ulivi, Paola, Hoque, Mohammad Ashadul, Mukammel, Twaha, Pritzker, Zeev, Lemesle, Augustin, Loureiro-Acuña, Jaime, Martı́nez, Xavier, Jiménez-Balsa, Gonzalo, Universidade de Vigo, Machine Learning in Information Networks (MAGNET), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Centre Hospitalier Universitaire de Liège (CHU-Liège), Timelex, Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Istituto Scientifico Romagnolo per lo Studio e la Cura dei Tumori (IRST) IRCCS, Technovative Solutions, Arteevo Technologies, Centro Tecnoloxico de Telecomunicacions de Galicia (Gradiant), and European Project: 101070038,TRUMPET
Subjects: Privacy Metrics, Patient Data Privacy, AI, Federated Learning Privacy Metrics Privacy Enhancing Technologies General Data Protection Regulation Clinical Cancer Research Patient Data Privacy, Healthcare, Clinical Cancer Research, [INFO]Computer Science [cs], Privacy Enhancing Technologies, Federated Learning, General Data Protection Regulation
Abstract: International audience; This paper is an overview of the EU-funded project TRUMPET (https://trumpetproject.eu/), and gives an outline of its scope and main technical aspects and objectives. In recent years, Federated Learning has emerged as a revolutionary privacy-enhancing technology. However, further research has cast a shadow of doubt on its strength for privacy protection. The goal of TRUMPET is to research and develop novel privacy enhancement methods for Federated Learning, and to deliver a highly scalable Federated AI service platform for researchers, that will enable AI-powered studies of siloed, multi-site, crossdomain, cross-border European datasets with privacy guarantees that follow the requirements of GDPR. The generic TRUMPET platform will be piloted, demonstrated and validated in the specific use case of European cancer hospitals, allowing researchers and policymakers to extract AI-driven insights from previously inaccessible cross-border, cross-organization cancer data, while ensuring the patients' privacy.
Published: 2023

29. One-Shot Federated Conformal Prediction

Author: Humbert, Pierre, Bars, Batiste Le, Bellet, Aurélien, Arlot, Sylvain, Laboratoire de Mathématiques d'Orsay (LMO), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Statistique mathématique et apprentissage (CELESTE), Inria Saclay - Ile de France, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de Mathématiques d'Orsay (LMO), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Machine Learning in Information Networks (MAGNET), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), ANR-20-CE23-0015,PRIDE,Apprentissage automatique décentralisé et préservant la vie privée(2020), Laboratoire de Mathématiques d'Orsay [LMO], Statistique mathématique et apprentissage [CELESTE], Machine Learning in Information Networks [MAGNET], and Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 [CRIStAL]
Subjects: FOS: Computer and information sciences, [STAT]Statistics [stat], [STAT.ML]Statistics [stat]/Machine Learning [stat.ML], Statistics - Machine Learning, Machine Learning (stat.ML)
Abstract: International audience; In this paper, we introduce a conformal prediction method to construct prediction sets in a oneshot federated learning setting. More specifically, we define a quantile-of-quantiles estimator and prove that for any distribution, it is possible to output prediction sets with desired coverage in only one round of communication. To mitigate privacy issues, we also describe a locally differentially private version of our estimator. Finally, over a wide range of experiments, we show that our method returns prediction sets with coverage and length very similar to those obtained in a centralized setting. Overall, these results demonstrate that our method is particularly well-suited to perform conformal predictions in a one-shot federated learning setting.
Published: 2023

30. A New Finite-Time Sliding-Mode Controller for a Class of Second-Order Non-Linear Systems

Author: Ríos, Héctor, Mera, Manuel, Polyakov, Andrey, Instituto Tecnologico de la Laguna (ITL), Instituto Politechnico National (IPN), Instituto Politecnico Nacional [Mexico] (IPN), Finite-time control and estimation for distributed systems (VALSE), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Instituto Tecnologico de la Laguna [ITL], Instituto Politechnico National [IPN], and Finite-time control and estimation for distributed systems [VALSE]
Subjects: Robust Control Sliding-Mode Control Second-Order Systems, Robust Control, Sliding-Mode Control, Second-Order Systems, [INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering
Abstract: International audience; This paper contributes to the design of a new finite-time sliding-mode controller for a class of uncertain second-order non-linear systems. The proposed strategy takes into account the design of a family of sliding variables, which establishes a second-order sliding-mode and ensures the convergence of the trajectories of the system to the origin in a finite time and despite the effect of some uncertainties on the system. The straightforward structure of the controller is simple to tune and implement. The global, uniform and finite-time stability of the closed-loop dynamics is demonstrated by means of Lyapunov functions. Furthermore, the performance of the proposed approach is validated through some simulation results.
Published: 2023

31. Generalized Homogeneous Unit Control

Author: Polyakov, Andrey, Finite-time control and estimation for distributed systems [VALSE], Finite-time control and estimation for distributed systems (VALSE), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), and Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)
Subjects: [INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering
Abstract: International audience; The methodology of the unit sliding mode control design (known since 1970s) for linear MIMO (Multiply Inputs Multiply Outputs) systems is revised based on the concept of the generalized homogeneity. The conventional restriction about a consistency of the number of control inputs with the dimension of the sliding surface is eliminated. A simple procedure for control parameters tuning is developed. The robustness of the homogeneous unit controller with respect to bounded matched perturbations is proven. The theoretical results are supported by numerical simulations.
Published: 2023

32. Trajectory Tracking in Unicycle Mobile Robots:A Homogeneity-based Control Approach

Author: Zhou, Y, Ríos, H, Mera, M, Polyakov, A, Zheng, G, Dzul, A, Finite-time control and estimation for distributed systems [VALSE], Instituto Tecnologico de la Laguna [ITL], Instituto Politechnico National [IPN], Deformable Robots Simulation Team [DEFROST ], Finite-time control and estimation for distributed systems (VALSE), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Instituto Tecnologico de la Laguna (ITL), Instituto Politechnico National (IPN), Instituto Politecnico Nacional [Mexico] (IPN), and Deformable Robots Simulation Team (DEFROST )
Subjects: Unicycle Mobile Robots Trajectory Tracking Homogeneity Finite-Time, Unicycle Mobile Robots, [INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering, Trajectory Tracking, Homogeneity, Finite-Time
Abstract: International audience; This paper contributes to the design of a family of homogeneous controllers to deal with the trajectory tracking problem in unicycle mobile robots (UMRs). The control strategy is based on a cascade control paradigm, which includes the position and orientation tracking error subsystems. The proposed homogeneous controllers provide different types of convergence to zero for the tracking error dynamics, i.e., asymptotic, exponential and finite-time convergence. Simulation results illustrate the performance of the proposed family of homogeneous controllers.
Published: 2023

33. On Prescribed-time Cooperative State Estimation of LTI Plants

Author: Li, M. (Min), Polyakov, A. (Andrey), Zheng, G. (Gang), Ping, X. (Xubin), Finite-time control and estimation for distributed systems (VALSE), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Deformable Robots Simulation Team (DEFROST ), Xidian University, International Federation of Automatic Control, Finite-time control and estimation for distributed systems [VALSE], and Deformable Robots Simulation Team [DEFROST ]
Subjects: Cooperative state estimation, [INFO.INFO-AU]Computer Science [cs]/Automatic Control Engineering, finite-time stability, linear homogeneity, nonlinear systems, prescribed-time stability
Abstract: International audience; The problem of prescribed-time cooperative state estimation is addressed in this paper. A network of strongly connected (linear homogenous) distributed observers are designed under the assumption that each observer can receive a time-varying scalar signal broadcasted by a supervisor. By a proper parameter tuning, the observer gains go infinity and estimation errors correspondingly reach zeros at the settling time prescribed by users.
Published: 2023

34. Low Trapping Effects and High Blocking Voltage in Sub-Micron-Thick AlN/GaN Millimeter-Wave Transistors Grown by MBE on Silicon Substrate

Author: Carneiro, Elodie, Rennesson, Stéphanie, Tamariz, Sebastian, Harrouche, Kathia, Semond, Fabrice, Medjdoub, Farid, WIde baNd gap materials and Devices - IEMN (WIND - IEMN), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), EasyGaN, Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA), 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)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), RENATECH, BPI France, This research was funded by the French National grant GaNeXT ANR-11-LABX-0014, and by a BPI France aid for innovation., Renatech Network, CMNF, and ANR-11-LABX-0014,GANEX,Réseau national sur GaN(2011)
Subjects: [SPI]Engineering Sciences [physics], MBE, mm-wave, Trapping, load pull, GaN-on-Si, HEMT
Abstract: International audience; In this work, sub-micron-thick AlN/GaN transistors (HEMTs) grown on a silicon substrate for high-frequency power applications are reported. Using molecular beam epitaxy, an innovative ultrathin step-graded buffer with a total stack thickness of 450 nm enables one to combine an excellent electron confinement, as reflected by the low drain-induced barrier lowering, a low leakage current below 10 µA/mm and low trapping effects up to a drain bias V DS = 30 V while using sub-150 nm gate lengths. As a result, state-of-the-art GaN-on-silicon power performances at 40 GHz have been achieved, showing no degradation after multiple large signal measurements in deep class AB up to V DS = 30 V. Pulsed-mode large-signal characteristics reveal a combination of power-added efficiency (PAE) higher than 35% with a saturated output power density (P OUT) of 2.5 W/mm at V DS = 20 V with a gate-drain distance of 500 nm. To the best of our knowledge, this is the first demonstration of high RF performance achieved with sub-micron-thick GaN HEMTs grown on a silicon substrate.
Published: 2023

35. PYCASO: Python module for calibration of cameras by Soloff’s method

Author: Caron, Eddy, Witz, Jean-François, Cuvier, Christophe, Beaurain, Arnaud, Magnier, Vincent, El Bartali, Ahmed, Laboratoire de Mécanique, Multiphysique, Multiéchelle - UMR 9013 (LaMcube), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mécanique des Fluides de Lille – Kampé de Fériet - UMR 9014 (LMFL), Centrale Lille-ONERA-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)
Subjects: [PHYS]Physics [physics]
Published: 2023

36. On delay-dependent conditions of ISS for generalized Persidskii systems

Author: Wenjie Mei, Denis Efimov, Rosane Ushirobira, Emilia Fridman, Finite-time control and estimation for distributed systems (VALSE), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Tel Aviv University (TAU), and Efimov, Denis
Subjects: [SPI.AUTO] Engineering Sciences [physics]/Automatic, Control and Systems Engineering, Electrical and Electronic Engineering, Computer Science Applications, [SPI.AUTO]Engineering Sciences [physics]/Automatic
Abstract: International audience; In this paper, input-to-state stability and stabilization conditions in time-delay generalized Persidskii systems are studied. These conditions are formulated in terms of linear matrix inequalities, which may depend on delay values, and be local or global in state space. Numerical examples of opinion dynamics and the Lotka-Volterra model illustrate the efficiency of the proposed results.
Published: 2023

37. Toward Run-time Coordination of Reconfiguration Requests in Cloud Computing Systems

Author: Farhat, Salman, Bliudze, Simon, Duchien, Laurence, Kouchnarenko, Olga, University of Lille, Self-adaptation for distributed services and large software systems (SPIRALS), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), ANR-16-IDEX-0004,ULNE,ULNE(2016), ANR-17-EURE-0002,EIPHI,Ingénierie et Innovation par les sciences physiques, les savoir-faire technologiques et l'interdisciplinarité(2017), Self-adaptation for distributed services and large software systems [SPIRALS], and Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) [FEMTO-ST]
Subjects: Variability Models, Dynamic Reconfiguration, Concurrent Component-based Systems, [INFO.INFO-SE]Computer Science [cs]/Software Engineering [cs.SE], Self-Configuration
Abstract: International audience; Cloud applications and cyber-physical systems are becoming increasingly complex, requiring frequent reconfiguration to adapt to changing needs and requirements. Existing approaches compute new valid configurations either at design time, at runtime, or both. However, these approaches can lead to significant computational or validation overheads for each reconfiguration step. We propose a component-based approach that avoids computational and validation overheads using a representation of the set of valid configurations as a variability model. More precisely, our approach leverages feature models to automatically generate, in a component-based formalism called JavaBIP, run-time variability models that respect the feature model constraints. Produced run-time variability models enable control over application reconfiguration by executing reconfiguration requests in such a manner as to ensure the (partial) validity of all reachable configurations. We evaluate our approach on a simple web application deployed on the Heroku cloud platform. Experimental results show that the overheads induced by generated run-time models on systems involving up to 300 features are negligible, demonstrating the practical interest of our approach.
Published: 2023

38. Insight into the true role of hydrogen-carbonate species in CO oxidation over Pd/Al2O3 catalyst using SSITKA-transmission IR technique

Author: Hatoum, Ibrahim, Richard, Mélissandre, Dujardin, Christophe, Université de Lille, CNRS, Centrale Lille, ENSCL, Univ. Artois, Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS], Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), and Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)
Subjects: Process Chemistry and Technology, Operando IR spectroscopy, SSITKA, CO oxidation, Hydrogen-carbonate, Mechanism, Palladium, [CHIM.CATA]Chemical Sciences/Catalysis, General Chemistry, Catalysis
Abstract: International audience; The powerful combination of steady state isotopic transient kinetic analysis (SSITKA) and operando infrared spectroscopy (IR) was applied to study the CO oxidation reaction on Pd-supported Al2O3 catalyst at low temperature. The aim was to reveal the true role of hydrogen‑carbonate species in the reaction mechanism. The SSITKA-IR experiments, conducted in presence and absence of CO2 in the gas feed, have confirmed that hydrogen‑carbonate species behave as spectator species in the reaction. Its formation was due to re-adsorption of the CO2 product itself on the alumina surface as confirmed by the direct 12CO2/13CO2 exchange observed on the bare support.
Published: 2023

39. DP-SGD Without Clipping: The Lipschitz Neural Network Way

Author: Bethune, Louis, Massena, Thomas, Boissin, Thibaut, Prudent, Yannick, Friedrich, Corentin, Mamalet, Franck, Bellet, Aurelien, Serrurier, Mathieu, Vigouroux, David, Argumentation, Décision, Raisonnement, Incertitude et Apprentissage (IRIT-ADRIA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-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)-Toulouse Mind & Brain Institut (TMBI), Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Université Toulouse III - Paul Sabatier (UT3), IRT Saint Exupéry - Institut de Recherche Technologique, Machine Learning in Information Networks (MAGNET), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and ANR-19-P3IA-0004,ANITI,Artificial and Natural Intelligence Toulouse Institute(2019)
Subjects: FOS: Computer and information sciences, Computer Science - Machine Learning, Computer Science - Cryptography and Security, [INFO]Computer Science [cs], Cryptography and Security (cs.CR), Machine Learning (cs.LG)
Abstract: State-of-the-art approaches for training Differentially Private (DP) Deep Neural Networks (DNN) faces difficulties to estimate tight bounds on the sensitivity of the network's layers, and instead rely on a process of per-sample gradient clipping. This clipping process not only biases the direction of gradients but also proves costly both in memory consumption and in computation. To provide sensitivity bounds and bypass the drawbacks of the clipping process, our theoretical analysis of Lipschitz constrained networks reveals an unexplored link between the Lipschitz constant with respect to their input and the one with respect to their parameters. By bounding the Lipschitz constant of each layer with respect to its parameters we guarantee DP training of these networks. This analysis not only allows the computation of the aforementioned sensitivities at scale but also provides leads on to how maximize the gradient-to-noise ratio for fixed privacy guarantees. To facilitate the application of Lipschitz networks and foster robust and certifiable learning under privacy guarantees, we provide a Python package that implements building blocks allowing the construction and private training of such networks., Comment: 39 pages, preprint
Published: 2023

40. A VM-Agnostic and Backwards Compatible Protected Modifier for Dynamically-Typed Languages

Author: Thomas, Iona, Aranega, Vincent, Ducasse, Stéphane, Polito, Guillermo, Tesone, Pablo, Analyses and Languages Constructs for Object-Oriented Application Evolution [RMOD], Analyses and Languages Constructs for Object-Oriented Application Evolution (RMOD), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), and Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)
Subjects: FOS: Computer and information sciences, Object-oriented languages, protected, encapsulation, Extensible languages, Language features, Dynamically-typed languages, Pharo, Computer Science - Programming Languages, [INFO.INFO-PL]Computer Science [cs]/Programming Languages [cs.PL], [INFO]Computer Science [cs], Programming Languages (cs.PL)
Abstract: In object-oriented languages, method visibility modifiers hold a key role in separating internal methods from the public API. Protected visibility modifiers offer a way to hide methods from external objects while authorizing internal use and overriding in subclasses. While present in main statically-typed languages, visibility modifiers are not as common or mature in dynamically-typed languages. In this article, we present ProtDyn, a self-send-based visibility model calculated at compile time for dynamically-typed languages relying on name-mangling and syntactic differentiation of self vs non self sends. We present #Pharo, a ProtDyn implementation of this model that is backwards compatible with existing programs, and its port to Python. Using these implementations we study the performance impact of ProtDyn on the method lookup, in the presence of global lookup caches and polymorphic inline caches. We show that our name mangling and double method registration technique has a very low impact on performance and keeps the benefits from the global lookup cache and polymorphic inline cache. We also show that the memory overhead on a real use case is between 2 % and 13 % in the worst-case scenario. Protected modifier semantics enforces encapsulation such as private but allow developers to still extend the class in subclasses. ProtDyn offers a VM-agnostic and backwards-compatible design to introduce protected semantics in dynamically-typed languages.
Published: 2023

41. Optimisation du décodage par liste de vidéos corrompues basée sur une architecture d'apprentissage en profondeur

Author: Zhang, Y. (Yujing), Coulombe, S. (Stéphane), Coudoux, F-X. (François-Xavier), Corlay, P. (Patrick), Université Polytechnique Hauts-de-France (UPHF), Ecole de Technologie Supérieure [Montréal] (ETS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), COMmunications NUMériques - IEMN (COMNUM - IEMN), INSA Institut National des Sciences Appliquées Hauts-de-France (INSA Hauts-De-France), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université Polytechnique Hauts-de-France [UPHF], Ecole de Technologie Supérieure [Montréal] [ETS], and Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Subjects: [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, distorsions non uniformes, évaluation de la qualité des images, Transmission vidéo, réseau de neurones convolutif
Abstract: National audience; This poster presents an optimized list decoding solution for videos corrupted by transmission errors. It is based on no-reference image quality assessment using a convolutional neural network (CNN) that effectively handles non-uniform distortions. At the end of a list decoding process, we evaluate the quality of each generated candidate image (without reference) in order to select the best one. When the transmission error occurs in an intra encoded image, our architecture has a decision accuracy of more than 98% against 46% for the original pre-trained CNN architecture. For errors in an inter encoded image, it's 79% versus 33%.; Cet poster présente une solution de décodage par liste optimisée pour des vidéos corrompues par des erreurs de transmission. Elle est basée sur l'évaluation de la qualité des images sans référence utilisant un réseau de neurones convolutif (CNN) qui gère efficacement les distorsions non uniformes. À l'issue d'un processus de décodage par liste, nous évaluons la qualité de chaque image candidate générée (sans référence) afin de sélectionner la meilleure. Lorsque l'erreur de transmission se produit dans une image intra, notre architecture a une précision de décision de plus de 98% contre 46% pour l'architecture CNN originale pré-entraînée. Pour les erreurs dans une image inter, c'est 79% contre 33%.
Published: 2023

42. Configuration Optimization with Limited Functional Impact

Author: Guégain, E. (Edouard), Taherkordi, A. (Amir), Quinton, C. (Clément), Self-adaptation for distributed services and large software systems (SPIRALS), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), University of Oslo (UiO), ANR-19-CE25-0003,Koala,Configurations d'environnements fog large-échelle(2019), Self-adaptation for distributed services and large software systems [SPIRALS], and University of Oslo [UiO]
Subjects: Optimization, Performance, [INFO.INFO-SE]Computer Science [cs]/Software Engineering [cs.SE], Variability, Software
Abstract: International audience; Dealing with a large configuration space is a complex task for developers, especially when configurations must comply with both functional constraints and non-functional goals. In this paper, we introduce an approach to optimize any set of performance indicators for an existing configuration, while meeting functional requirements. The efficiency of this approach is assessed by exhaustively optimizing a configurable system, and by analyzing how the algorithm navigates through the configuration space. This approach proves especially efficient at optimizing configurations through a minimal number of changes, thus limiting the impact on their functional behavior.
Published: 2023

43. Reduction of helium permeation in microfabricated cells using aluminosilicate glass substrates and Al2O3 coatings

Author: Carlé, C., Keshavarzi, S., Mursa, A., Karvinen, P., Chutani, R., Bargiel, S., Queste, S., Vicarini, R., Abbé, P., Hafiz, M. Abdel, Maurice, V., Boudot, R., Passilly, N., University of Joensuu, Department of Physics and Mathematics (JOE), University of Joensuu, Franche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) (FEMTO-ST), Université de Technologie de Belfort-Montbeliard (UTBM)-Ecole Nationale Supérieure de Mécanique et des Microtechniques (ENSMM)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Centre méditerranéen de médecine moléculaire (C3M), 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 de la Santé et de la Recherche Médicale (INSERM)-Université Côte d'Azur (UCA), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Acoustique Impulsionnelle & Magnéto-Acoustique Non linéaire - Fluides, Interfaces Liquides & Micro-Systèmes - IEMN (AIMAN-FILMS - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), This work was supported partially by the Direction Générale de l’Armement (DGA) and by the Agence Nationale de la Recherche (ANR) in the frame of the ASTRID project named PULSACION under Grant No. ANR-19-ASTR-0013-01 as well as by the Région Franche-Comté (NOUGECELL project). It was also supported by the Agence Nationale de la Recherche (ANR) in the frame of the LabeX FIRST-TF (Grant No. ANR 10-LABX-48-01),the EquipX Oscillator-IMP (Grant No. ANR 11-EQPX-0033), and the EIPHI Graduate school (Grant No. ANR-17-EURE-0002). The work of Clément Carlé was funded by the Centre National d’Etudes Spatiales (CNES) and the Agence Innovation Défense (AID) and the one of Petri Karvinen by the Photonics Researchand Innovation (PREIN) Programme of the Academy of Finland, decision 320166. This work was partly supported by the french RENATECH network and its FEMTO-ST technological facility (MIMENTO)., Renatech Network, ANR-19-ASTR-0013,PULSACION,Horloge atomique à régime impulsionnel avec technologie de cellule MEMS améliorée(2019), ANR-10-LABX-0048,FIRST-TF,Network of Facilities for Innovation, Research, Services and Training in Time & Frequency(2010), ANR-11-EQPX-0033,Oscillator IMP,Plateforme de Mesure de l'Instabilité des Oscillateurs(2011), and ANR-17-EURE-0002,EIPHI,Ingénierie et Innovation par les sciences physiques, les savoir-faire technologiques et l'interdisciplinarité(2017)
Subjects: [PHYS]Physics [physics], [SPI]Engineering Sciences [physics], Atomic Physics (physics.atom-ph), FOS: Physical sciences, Physics - Atomic Physics
Abstract: The stability and accuracy of atomic devices can be degraded by the evolution of their cell inner atmosphere. Hence, the undesired entrance or leakage of background or buffer gas, respectively, that can permeate through the cell walls, should be slowed down. In this work, we investigate helium permeation in microfabricated alkali vapor cells filled with He and whose windows are made of borosilicate glass (BSG) or aluminosilicate glass (ASG). The permeation is then derived from routine measurements of the pressure-shifted hyperfine transition frequency of an atomic clock. We first confirm that ASG reduces He permeation rate by more than two orders of magnitude, in comparison with BSG. In addition, we demonstrate that Al$_2$O$_3$ thin-film coatings, known to avoid alkali consumption in vapor cells, can also significantly reduce He permeation. The permeation through BSG is thereby reduced by a factor 110 whereas the one through ASG is decreased by a factor up to 5.8 compared to uncoated substrates. These results may contribute to the development of miniaturized atomic clocks and sensors with improved long-term stability or sensitivity., Comment: 7 pages, 5 figures
Published: 2023

44. Augmentation de jeux de données RI pour la recherche conversationnelle à initiative mixte

Author: Erbacher, P. (Pierre), Preux, P. (Philippe), Nie, J-Y. (Jian-Yun), Soulier, L. (Laure), Institut des Systèmes Intelligents et de Robotique (ISIR), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Machine Learning and Information Access (MLIA), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Département d'Informatique et de Recherche Opérationnelle [Montreal] (DIRO), Université de Montréal (UdeM), Zargayouna, Haïfa, ANR-18-CE23-0001,SESAMS,Systèmes conversationnels de recherche d'information(2018), Montreal University, Scool (Scool), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut des Systèmes Intelligents et de Robotique [ISIR], and Scool [Scool]
Subjects: méthodologie de construction d'ensembles de données, interactions mixtes, Recherche conversationnelle, recherche d'informations, [INFO.INFO-CL]Computer Science [cs]/Computation and Language [cs.CL]
Abstract: International audience; Une des particularités des systèmes de recherche conversationnelle est qu'ils impliquent des initiatives mixtes telles que des questions de clarification des requêtes générées par le système pour mieux comprendre le besoin utilisateur. L'évaluation de ces systèmes à grande échelle sur la tâche finale de RI est très difficile et nécessite des ensembles de données adéquats contenant de telles interactions. Cependant, les jeux de données actuels se concentrent uniquement sur les tâches traditionnelles de RI ad hoc ou sur les tâches de clarification de la requête. Pour combler cette lacune, nous proposons une méthodologie pour construire automatiquement des ensembles de données de RI conversationnelle à grande échelle à partir d'ensembles de données de RI ad hoc afin de faciliter les explorations sur la RI conversationnelle. Nous effectuons une évaluation approfondie montrant la qualité et la pertinence des interactions générées pour chaque requête initiale. Cet article montre la faisabilité et l'utilité de l'augmentation des ensembles de données de RI ad-hoc pour la RI conversationnelle.
Published: 2023

45. Uncovering the Environmental Impact of Software Life Cycle

Author: Simon, Thibault, Rust, Pierre, Rouvoy, Romain, Penhoat, Joël, Self-adaptation for distributed services and large software systems [SPIRALS], Orange Labs R&D [Rennes], Orange Labs [Lannion], Self-adaptation for distributed services and large software systems (SPIRALS), Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), France Télécom, and ANR-21-CE25-0022,DISTILLER,Service de recommandation pour des logiciels en ligne plus durables(2021)
Subjects: software life cycle, green software development, software life cycle software environmental impact green software development, software environmental impact, [INFO.INFO-SE]Computer Science [cs]/Software Engineering [cs.SE]
Abstract: International audience; The environmental footprint of a software service development may be impacted by several factors, spanning human factors to infrastructure choices. To the best of our knowledge, the state of the art in the domain of environmental footprint fails i) to address the full spectrum of software services life cycle, from design to operation and maintenance and ii) to cover different categories of impacts. In this paper, we therefore introduce a methodology and the associated model to guide the software development ecosystem and their stakeholders in estimating the environmental footprint of their projects along multiple impact categories. This holistic approach delivers actionable insights to identify potential shifting between phases, such as development and usage, but also hotspots among resources consumed to produce and operate software services. We report on a sample case study that emphasizes the importance of development impact on a software life cycle and shows the relative importance of phases, as well as resources consumed.
Published: 2023

46. Attaque par compatibilité et temporelle pour la stéganalyse JPEG

Author: Levecque, Etienne, Bas, Patrick, Butora, Jan, Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université de Lille, Centrale Lille, ACM, and European Project: 101021687,H2020,H2020-SU-SEC-2018-2019-2020,UNCOVER(2021)
Subjects: FOS: Computer and information sciences, compatibility attack, [INFO.INFO-CR]Computer Science [cs]/Cryptography and Security [cs.CR], Computer Science - Cryptography and Security, JPEG, timing attack, steganography, steganalysis, Cryptography and Security (cs.CR), integer linear programming
Abstract: This paper introduces a novel compatibility attack to detect a steganographic message embedded in the DCT domain of a JPEG image at high-quality factors (close to 100). Because the JPEG compression is not a surjective function, i.e. not every DCT blocks can be mapped from a pixel block, embedding a message in the DCT domain can create incompatible blocks. We propose a method to find such a block, which directly proves that a block has been modified during the embedding. This theoretical method provides many advantages such as being completely independent to Cover Source Mismatch, having good detection power, and perfect reliability since false alarms are impossible as soon as incompatible blocks are found. We show that finding an incompatible block is equivalent to proving the infeasibility of an Integer Linear Programming problem. However, solving such a problem requires considerable computational power and has not been reached for 8x8 blocks. Instead, a timing attack approach is presented to perform steganalysis without potentially any false alarms for large computing power., Workshop on Information Hiding and Multimedia Security, ACM, Jun 2023, Chicago, United States
Published: 2023

47. Efficient mitigation of railway induced vibrations using seismic metamaterials

Author: Slimane Ouakka, Abdellatif Gueddida, Yan Pennec, Bahram Djafari-Rouhani, Georges Kouroussis, Olivier Verlinden, University of Mons [Belgium] (UMONS), Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Physique - IEMN (PHYSIQUE - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), AcknowledgementsThis work was financially supported by the European Union’s Horizon 2020 research and innovation programme under the MarieSkłodowska-Curie grant agreement No INSPIRE-813424, European Project: 730997,EUROCHAMP2020(2020), and European Project: 813424,H2020,H2020-MSCA-ITN-2018,INSPIRE(2019)
Subjects: [PHYS]Physics [physics], [SPI]Engineering Sciences [physics], Seismic metamaterials, Metamaterials band gap, Train–track–soil interactions, Ground-borne vibration and noise attenuation, Light Rail Vehicle, Periodic barriers, Railway mitigation measure, Civil and Structural Engineering
Abstract: International audience; AbstractThe fast growth of railway transport pushed by its sustainability requires all railway stakeholders to work together to minimise any possible drawbacks that might slow down this positive trend. Among these, the induced vibrations generated at the wheel–rail interaction during train passage are the most significant, especially in urban areas where in the form of ground-borne vibrations and/or noise negatively affects the daily life of the residents. In this direction, the innovative concept of seismic metamaterial can enhance the vibration attenuation levels of existing mitigation measures and, at the same time, ensure a straightforward application in the railway environment. This paper uses a combined vehicle/track/soil prediction dynamic model of the T2000 LRV (Light Rail Vehicle) tram operating in Brussels, based on a two-step approach already validated in the past, to analyse the effects that the inclusion of seismic metamaterials within the transmission path has in terms of vibration attenuation. In particular, a four-by-four group of piles is examined with different material proprieties for the inclusions, considering a range of velocities and distances from the track in order to quantify the achievable Insertion Loss (IL) for each configuration depending on the distances and the tram speed, attaining ILs up to 10 [dB]. The study is then extended to other possible arrangements of the group of piles, providing a direct relationship between the repetitiveness of each row of the primitive unit cell of the metamaterial and the gained levels of attenuation, in order to give a base for the costs of this type of mitigation measure. Furthermore, the influence on the attenuation levels of the soil characteristics, is evaluated by considering an ideal uniform underground, extending the IL to 18 [dB] in the case of steel inclusion. Finally, the paper gives insights into the use of metamaterials as mitigation measures for railway-induced vibration in order to understand and evaluate the potential of this novel concept and its benefits.
Published: 2023

48. Elastic and thermo-elastic characterizations of thin resin films using colored picosecond acoustics and spectroscopic ellipsometry

Author: A. Devos, F. Chevreux, C. Licitra, A. Chargui, L.-L. Chapelon, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Physique - IEMN (PHYSIQUE - IEMN), Université catholique de Lille (UCL)-Université catholique de Lille (UCL)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF)-JUNIA (JUNIA), STMicroelectronics [Crolles] (ST-CROLLES), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), STMicroelectronics, The authors acknowledge funding support within the frame of the STMicroelectronics-IEMN common laboratory and the NANO2022 Program. Part of this work, performed on the Platform for Nano-Characterisation (PFNC) of CEA, was supported by the 'Recherche Technologique de Base' Program of the French Ministry of Research., and Laboratoire commun STMicroelectronics-IEMN T3
Subjects: [PHYS]Physics [physics], [SPI]Engineering Sciences [physics], Picosecond acoustics, Radiology, Nuclear Medicine and imaging, Mechanical properties, Photoresist, Resin, Atomic and Molecular Physics, and Optics
Abstract: International audience; Colored Picosecond Acoustics (CPA) and Spectroscopic Ellipsometry (SE) are combined to measure elastic and thermoelastic properties of polymer thin-film resins deposited on 300 mm wafers. Film thickness and refractive index are measured using SE. Sound velocity and thickness are measured using CPA from the refractive index. Comparing the two thicknesses allows checking consistency between both approaches. The same combination is then applied at various temperatures from 19 • to 180 • C. As the sample is heated, both thickness and sound velocity change. By monitoring these contributions separately, the Temperature Coefficient on sound Velocity (TCV) and the Coefficient on Thermal Expansion are deduced. The protocol is applied to five industrial samples made of different thin-film resins currently used by microelectronic industry. Young's modulus varies from resin to resin by up to 20%. TCV is large on each resin and varies from one resin to another up to 57%.
Published: 2023

49. Heterogeneous Multiagent Systems With Different Fractional Order: An Experience-Based Fusion Controller

Author: Yiwen Chen, Guoguang Wen, Ahmed Rahmani, Tingwen Huang, Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Centrale Lille
Subjects: Electrical and Electronic Engineering, ComputingMilieux_MISCELLANEOUS, [SPI.AUTO]Engineering Sciences [physics]/Automatic
Abstract: International audience
Published: 2022

50. The regular languages of wire linear AC$$^0$$

Author: Michaël Cadilhac, Charles Paperman, School of Computing [DePaul] (SOC), DePaul University [Chicago], Inria Lille - Nord Europe, Institut National de Recherche en Informatique et en Automatique (Inria), Linking Dynamic Data (LINKS), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189 (CRIStAL), and Centrale Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)
Subjects: Computer Networks and Communications, [INFO]Computer Science [cs], Software, Information Systems
Abstract: International audience
Published: 2022

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