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499 results on '"Université Toulouse III - Paul Sabatier (UT3)"'

1. Transient Electric Field Shaping With the Linear Combination of Configuration Field Method for Enhanced Spatial Control of Microwave Plasmas

Author

Laurent Liard, Ali Al Ibrahim, Simon Dap, Romain Pascaud, Pierre Bonnet, Cédric Chauvière, Olivier Pascal, Richard Clergereaux, Valentin Mazieres, LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Institut Pascal (IP), SIGMA Clermont (SIGMA Clermont)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Mathématiques Blaise Pascal (LMBP), Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Sciences et Ingénierie des Plasmas Réactifs et des Arcs (LAPLACE-ScIPRA), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Groupe de Recherche Energétique, Plasmas et Hors Equilibre (LAPLACE-GREPHE), Groupe de Recherche en Electromagnétisme (LAPLACE-GRE), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, ISAE-SUPAERO, Université de Toulouse, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Université Clermont Auvergne - UCA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), SIGMA Clermont (FRANCE), SIGMA Clermont (SIGMA Clermont)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020]), and Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3)

Subjects
Materials science, General Computer Science, Field (physics), Microwave plasma sources, transient field shaping, Time reversal, time reversal, 02 engineering and technology, Reverberation chamber, 01 natural sciences, Signal, reverberation chamber, Optics, [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph], Physics::Plasma Physics, Electric field, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Traitement du signal et de l'image, Waveform, inverse source problem, General Materials Science, Transient field shaping, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, business.industry, [SPI.PLASMA]Engineering Sciences [physics]/Plasmas, Inverse source problem, General Engineering, 020206 networking & telecommunications, Plasma, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Transient (oscillation), lcsh:Electrical engineering. Electronics. Nuclear engineering, business, lcsh:TK1-9971, Microwave, Electromagnetic reverberation chamber
Abstract

International audience; The demonstration of enhanced spatial control of nanosecond microwave plasmas generated by the time reversal plasma source is presented in this paper. This new microwave plasma source relies on the spatio-temporal control of the electric field inside an all-metal plasma reactor by modifying the waveform of a high power microwave signal. More specifically, it originally used the spatio-temporal focusing capabilities of the time reversal method to focus a high electric field in a small location. However, a parasitic microwave breakdown can still occur at sharp corners or wedges inside the cavity due to the local enhancement of the residual electric field during time reversal focusing. Thus, it is proposed to use the linear combination of configuration field method to improve field control inside the reactor. Its transient electric field shaping capabilities turn out to be a good candidate for the development of a low pressure microwave "plasma brush".

Published
2020

2. Thermal Valorization of the LED by a Thermoelectric Generator

Author

Ahlem Ben Halima, Z. Araoud, Georges Zissis, Laurent Canale, Kamel Charrada, École Nationale d’Ingénieurs de Monastir (ENIM), Unité d’Éude des Milieux Ionisés et Réactifs [Monastir] (EMIR), Institut Préparatoire aux Etudes d'Ingénieurs de Monastir (IPEIM), Université de Monastir - University of Monastir (UM)-Université de Monastir - University of Monastir (UM), Lumière et Matière (LAPLACE-LM), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, and Centre National de la Recherche Scientifique (CNRS)

Subjects
Work (thermodynamics), Materials science, business.industry, Energy consumption, computer.software_genre, 7. Clean energy, [SPI.TRON]Engineering Sciences [physics]/Electronics, Simulation software, Thermoelectric generator, Heat flux, Thermal, Thermoelectric effect, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Process engineering, business, computer, ComputingMilieux_MISCELLANEOUS, Efficient energy use
Abstract

Reducing energy consumption in all areas is an ecological and economic necessity. The energy losses are manifested in most cases by a release of heat which reduces the energy efficiency of the system. The recovery of these thermal losses, if they are in sufficient quantity, can be a solution to reduce the overall energy consumption of the system and increase its efficiency. The goal of this work is to explore a way to enhance the thermal flux dissipated by High Power LEDs to produce light through thermoelectric conversion by Peltier modules. This preliminary study appears to present a fairly promising method of producing light through the production of thermoelectric energy.The study was implemented by performing 3D thermal simulations using COMSOL™ simulation software.

Published
2021

3. Design and Analysis of Transparent and Non-Transparent Antennas Integrated in OLEDs at 3.5 GHz Band for 5G Applications

Author

Mustapha El Halaoui, Georges Zissis, Laurent Canale, Adel Asselman, Lumière et Matière (LAPLACE-LM), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Faculté des Sciences de Tétouan, and Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, business.industry, Optical transparency, Substrate (electronics), Radiation, 7. Clean energy, Mesh geometry, [SPI.TRON]Engineering Sciences [physics]/Electronics, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, OLED, Optoelectronics, Antenna (radio), business, ComputingMilieux_MISCELLANEOUS, 5G, Diode
Abstract

In this article, an optically transparent antenna, integrated in organic light-emitting diodes (OLEDs), is proposed for sub-6 GHz 5G applications. The concept of the mesh geometry is applied to obtain high optical transparency. To validate this technique, the transparent antenna is compared with the non-transparent in terms of electrical, optical and radiation parameters. These antennas are designed on a transparent glass substrate with dimensions of 30 × 35 mm2 and using copper films. The two antennas cover the 3.5 GHz band for 5G applications. The peak gain of the transparent antenna integrated in OLEDs light sources is 5.53 dB at 3.57 GHz. The gain value, improved after the integration, can be justified by the effect of OLEDs layers.

Published
2021

4. Evaluation of Blue-Blocking Lenses Effects on the Melatonin Production level

Author

Georges Zissis, Adel Asselman, Oussama Ben Abdellah, Pascal Dupuis, Laurent Canale, Bousselham Samoudi, Faculté des Sciences de Tétouan, Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique (CNRS), Lumière et Matière (LAPLACE-LM), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3)

Subjects
Melanopsin, Artificial light, business.industry, Blocking (radio), eye diseases, Melatonin, medicine.anatomical_structure, Pupillary reflex, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Optometry, Medicine, [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie, Human eye, sense organs, business, ComputingMilieux_MISCELLANEOUS, Blue light, medicine.drug
Abstract

Blue light has proven its impact on melatonin concentration levels, the circadian rythm disruption, body temperature, pupillary reflex and fastening the AMD (Age-related macular degeneration). Humans dialy routine has recently been compromised by the extreme utilization of LED screens (TV, smartphone, computer) that emit a considerable quantity of blue light. Therefore, researchers carried out experimental studies to evaluate the possible impact, both positive and negative of blue light, and prescribed some limitations regarding the safety of the utilization of artificial light sources and LED screens. Recently, transparent blue blocking lenses started being massively recommended for everyday use for the purpose of attenuating the negative effects of blue LEDs. Hence in this study, different lenses were tested using a Minolta CS-1000 spectroradiometer and three different light sources in order to evaluate their impact on the photometric and the colorimetric parameters of light perceived by the human eye, and their possible melatonin-production-schedule and retinal protection. Results indicate that the studied blue blocking lenses may add a minor or an insignificant protection to the wearers for the reason that devices software provide a sufficient protection for the retina and for the melanopsin photoreceptor.

Published
2021

5. Common Mode and Differential Mode noise of AC/DC LED Driver

Author

Abdelhakim Zeghoudi, Amar Tilmatine, Abdelber Bendaoud, Helima Slimani, Laurent Canale, Applications of Plasma, Electrostatics and Electromagnetic Compatibility (APELEC), Université Djilali Liabès [Sidi-Bel-Abbès], Lumière et Matière (LAPLACE-LM), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Université Ibn Khaldoun de Tiaret = University of Tiaret, and This research is part of the PHC 'MAGHREB' (Programme Hubert Curien n°43981ZG) MELINA (Mastering Efficient Lighting In North Africa) granted to Laurent Canale and funded via Campus France by the French Ministry of Europe and Foreign Affairs and Algerian Ministry of Higher Education and Scientific Research.

Subjects
AC/DC PFC, Computer science, Driver, Topology (electrical circuits), Power factor, 7. Clean energy, Electromagnetic interference, Common Mode, Interference (communication), LISN, EMI, EMC, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, Common-mode signal, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, business.industry, LED, [SPI.NRJ]Engineering Sciences [physics]/Electric power, Electrical engineering, Electromagnetic compatibility, Line (electrical engineering), Differential Mode, [SPI.TRON]Engineering Sciences [physics]/Electronics, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, business
Abstract

International audience; Electromagnetic interference (EMI) represents one of the biggest problems facing the production of any electronic device. The impact on the performance of the device caused such unwanted interference must be carefully measured to understand and quantify the electromagnetic compatibility (EMC) of the instrument under test. The electrical power conversions are among the sources of electromagnetic pollution, they provide a low power factor and generate electromagnetic interference (EMI). The white light emitting diode (LED) has attracted a lot of attention from industry and scientific researchers due to its high efficiency, easy of driving, and long life. Nevertheless, LED driver can interfere with the electronic device system due to rapid voltage variation and current. In this paper we simulate some LED driver topology on LTspice software in order to measure the electromagnetic disturbances using LISN (line impedance stabilizer network) device.

Published
2021

6. Non-invasive real time monitoring of cellular modifications with microwave dielectric spectroscopy at the single cell level

Author

David Dubuc, W. Chen, Katia Grenier, Équipe Micro et nanosystèmes HyperFréquences Fluidiques (LAAS-MH2F), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
[SDV.BIO]Life Sciences [q-bio]/Biotechnology, Materials science, business.industry, 020208 electrical & electronic engineering, 020206 networking & telecommunications, 02 engineering and technology, Dielectric, Cellular level, Dielectric spectroscopy, Trap (computing), [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Proof of concept, Nondestructive testing, 0202 electrical engineering, electronic engineering, information engineering, Optoelectronics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, business, Spectroscopy, Microwave
Abstract

International audience; Microwave dielectric spectroscopy constitutes an attractive sensing technique for cellular analysis. One key feature is its ability to non-invasively and dielectrically monitor cellular modifications at the single cell level. The proposed microwave sensor dedicated to single cell measurement includes a mechanical trap, which permits to apply on individual cells whatever liquid-based environment. The dielectric consequences on the cell due to the application of saponine at 0.02% is recorded every two minutes, demonstrating the possibility to reach dielectric transformation kinetic of cells. This proof of concept opens the door to the non-invasive and nondestructive evaluation of biological reactions at the cellular level.

Published
2021

7. Performing manufacturing tasks with a mobile manipulator: from motion planning to sensor based motion control

Author

Florent Lamiraux, Joseph Mirabel, Sébastien Boria, Olivier Stasse, Alexis Nicolin, Thuc Long Ha, Équipe Mouvement des Systèmes Anthropomorphes (LAAS-GEPETTO), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Airbus Defence and Space [Toulouse], Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
Computer science, Mobile manipulator, business.industry, Location awareness, 030204 cardiovascular system & hematology, Motion control, computer.software_genre, Task (project management), 03 medical and health sciences, 0302 clinical medicine, Control theory, Trajectory, [INFO.INFO-RB]Computer Science [cs]/Robotics [cs.RO], Robot, Computer vision, 030212 general & internal medicine, Motion planning, Artificial intelligence, business, computer
Abstract

International audience; We present a framework combining mobile ma-nipulation planning and sensor based motion control. Theresult of manipulation planning is a reference robot trajectorycomposed of segments. For each segment, a hierarchical taskbased controller is automatically built. Some of the segmentscorrespond to motions where some parts of the robot and ofthe environment are known to be close to each other. Thecorresponding controller implements a task of relative posebetween these elements. The task error is measured by visionsensors using AprilTags. The higher priority of this task withrespect to the reference joint trajectory greatly improves theaccuracy of the task affected by the poor accuracy of the robotbase localization and other sources of error.

Published
2021

8. InjectaBLE: Injecting malicious traffic into established Bluetooth Low Energy connections

Author

Geraldine Marconato, Romain Cayre, Mohamed Kaaniche, Vincent Nicomette, Guillaume Auriol, Florent Galtier, APSYS (Blagnac), Équipe Tolérance aux fautes et Sûreté de Fonctionnement informatique (LAAS-TSF), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse 1 Capitole (UT1)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
IoT, hijacking, computer.internet_protocol, Computer science, 02 engineering and technology, Man-in-the-middle attack, Computer security, computer.software_genre, [INFO.INFO-CR]Computer Science [cs]/Cryptography and Security [cs.CR], [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], 0202 electrical engineering, electronic engineering, information engineering, Wireless, [INFO]Computer Science [cs], Protocol (object-oriented programming), Implementation, Vulnerability (computing), Bluetooth Low Energy, business.industry, Offensive, Man-in-the-Middle, 020206 networking & telecommunications, injection, 020201 artificial intelligence & image processing, business, Internet of Things, computer
Abstract

International audience; Bluetooth Low Energy (BLE) is nowadays one of the most popular wireless communication protocols for Internet of Things (IoT) devices. As a result, several attacks have targeted this protocol or its implementations in recent years, illustrating the growing interest for this technology. However, some major challenges remain from an offensive perspective, such as injecting arbitrary frames, hijacking the Slave role or performing a Man-in-The-Middle in an already established connection. In this paper, we describe a novel attack called InjectaBLE, allowing to inject malicious traffic into an existing connection. This attack is highly critical as the vulnerability exploited is inherent to the BLE specification itself, which means that any BLE connection can be possibly vulnerable, regardless of the BLE devices involved in the connection. We describe the theoretical foundations of the attack, how to implement it in practice, and we explore four critical attack scenarios allowing to maliciously trigger a specific feature of the target device, hijack the Slave and Master role or to perform a Man-in-the-Middle attack. Finally, we discuss the impact of this attack and outline some mitigation measures.

Published
2021

9. Visual interpretation of CNN decision-making process using Simulated Brain MRI

Author

Giulia Maria Mattia, Patrice Péran, Xavier Franceries, Edouard Villain, Marie Véronique Le Lann, Federico Nemmi, Toulouse Neuro Imaging Center (ToNIC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-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 - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT), Équipe DIagnostic, Supervision et COnduite (LAAS-DISCO), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Centre de Recherches en Cancérologie de Toulouse (CRCT), and Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
business.industry, Computer science, Visual interpretation, Process (computing), Pattern recognition, Convolutional neural network, Visualization, visual interpretation, Data visualization, Dimension (vector space), Brain MRI, Position (vector), [INFO]Computer Science [cs], Artificial intelligence, Decision-making, simulated dataset, business, CNN
Abstract

International audience; Convolutional neural networks (CNNs) are being extensively used to analyze medical images given the remarkable performances achieved so far. Due to the non-transparent decision-making process, CNNs are thought to be black boxes, so hindering their applicability. We submit a novel visualization technique to shed light on CNNs decisions in a classification task. Brain magnetic resonance images are fed as input to an original 3D CNN to allow discrimination of normal against modified brain data. This modification targets specific brain regions by linearly increasing their intensity, and involves regions with very different features in dimension, position, and enclosed tissues. The proposed visualization method merges all convolutional layers output in order to highlight where the model is “looking” during the decision-making process. Our visualizations allow to recover the same areas modified in the images, thus proving they are relevant to the prediction as expected. Comparing results from models with different accuracy, show that even in the case of low performance the expected regions are present in the activation maps leading the way to ameliorations of the CNN architecture.

Published
2021

10. A Fault Tolerant Control Architecture Based on Fault Trees for an Underwater Robot Executing Transect Missions

Author

Karen Godary-Dejean, Adrien Hereau, Didier Crestani, Jérémie Guiochet, Robotique mobile pour l'exploration de l'environnement (EXPLORE), Laboratoire d'Informatique de Robotique et de Microélectronique de Montpellier (LIRMM), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Équipe Tolérance aux fautes et Sûreté de Fonctionnement informatique (LAAS-TSF), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), ANR-16-IDEX-0006,MUSE,MUSE(2016), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), and Université Fédérale Toulouse Midi-Pyrénées

Subjects
Fault tree analysis, 0209 industrial biotechnology, Computer science, business.industry, Reliability (computer networking), Real-time computing, Location awareness, Fault tolerance, 02 engineering and technology, computer.software_genre, [SPI.AUTO]Engineering Sciences [physics]/Automatic, Set (abstract data type), [INFO.INFO-PF]Computer Science [cs]/Performance [cs.PF], 020901 industrial engineering & automation, Software, Architecture, business, computer, Energy (signal processing)
Abstract

International audience; Robotic systems evolving in hazardous and harsh environment are prone to mission failure or system loss in presence of faults. This paper presents a fault tolerant methodology, implemented into a control architecture of an underwater robot that executes biological monitoring missions. High level constraint violations (mission, safety, energy, time and localization) and low level faults (software and hardware faults) are considered using a method based on fault trees. These undesirable events are detected and treated by a fault tolerant module that decides to recover at low level or to give a feedback to the mission manager which selects the high level reaction. This fault tolerant architecture has been tested on real field conditions, and we illustrate our methodology on a set of selected events. We conclude about reliability improvement of low cost underwater robots for complex and long missions.

Published
2021

11. High Voltage IGCTs for HVDC Converter-Stations

Author

Sebastien Sanchez, Davin Guedon, Philippe Ladoux, Sebastien Cornet, Convertisseurs Statiques (LAPLACE-CS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, EDF (EDF), and Institut Catholique d'Arts et Métiers (ICAM)

Subjects
HVDC converter, Interconnection, Ideal (set theory), business.industry, Computer science, [SPI.NRJ]Engineering Sciences [physics]/Electric power, Electrical engineering, Modular Multilevel Converter (MMC), Thyristor, High voltage, Modular design, Converters, 7. Clean energy, High- voltage direct-current (HVDC), Integrated Gate-Commutated Thyristor (IGCT), business, Voltage
Abstract

International audience; The generalized expansion of HVDC systems for applications such as interconnection between countriesand renewable energies is unquestionable. The performances and the efficiency of these links are crucial issues as they can transmit several TWh per year, while they are supposed to remain in operation during decades. Withthe broader use of modular multilevel converters, a huge quantity of semiconductor devices is used in the converter- stations, which may increase assembly complexity. This article deals with the use of devices with higher voltagesratings to keep the number of levels reasonable regarding the design constraints. Focusing on Integrated Gate Commutated Thyristors (IGCTs), this paper shows that 9 kV and 6.5 kV IGCTs exhibit excellent performancescompared to 4.5 kV devices and that they would be ideal for future +/- 640 kV / 1 GW symmetric monopole HVDC links.

Published
2021

12. Diffraction Tomography From Single-Molecule Localization Microscopy: Numerical Feasibility

Author

Michael Unser, Thanh-an Pham, Emmanuel Soubies, Ferréol Soulez, Soubies, Emmanuel, Centre International de Mathématiques et d'Informatique (de Toulouse) - - CIMI2011 - ANR-11-LABX-0040 - LABX - VALID, Biomedical Imaging Group [Lausanne], Ecole Polytechnique Fédérale de Lausanne (EPFL), Signal et Communications (IRIT-SC), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique (CNRS), Centre de Recherche Astrophysique de Lyon (CRAL), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), DAS-SAB, ANR-11-LABX-0040,CIMI,Centre International de Mathématiques et d'Informatique (de Toulouse)(2011), 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), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
0301 basic medicine, Fluorophore, [SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging, Phase (waves), super-resolution, 01 natural sciences, 010309 optics, Diffraction tomography, 03 medical and health sciences, chemistry.chemical_compound, Optics, 0103 physical sciences, Microscopy, Fluorescence microscope, [SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processing, Fluorescence microscopy, Physics, business.industry, Fluorescence, Sample (graphics), [SDV.IB.IMA] Life Sciences [q-bio]/Bioengineering/Imaging, 030104 developmental biology, [INFO.INFO-TI] Computer Science [cs]/Image Processing [eess.IV], chemistry, [INFO.INFO-TI]Computer Science [cs]/Image Processing [eess.IV], business, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, Refractive index, refractive index recovery
Abstract

International audience; Single-molecule localization microscopy (SMLM) is a fluorescence microscopy technique that achieves super-resolution imaging by sequentially activating and localizing random sparse subsets of fluorophores. Each activated fluorophore emits light that then scatters through the sample, thus acting as a source of illumination from inside the sample. Hence, the sequence of SMLM frames carries information on the distribution of the refractive index of the sample. In this proof-of-concept work, we explore the possibility of exploiting this information to recover the refractive index of the imaged sample, given the localized molecules. Our results with simulated data suggest that it is possible to exploit the phase information that underlies the SMLM data.

Published
2021

13. Preliminary Study on the Impact of Place and Route Strategy on FPGA Electromagnetic Emission

Author

Estevan L. Lara, Fabian Vargas, A. Boyer, Gunter Winkler, Juliano Benfica, Allan A. Constante, Bernd Deutschmann, Andreas Gleinser, Sonia Ben Dhia, Pontifical Catholic University of Rio Grande do Sul (PUC-RS), Équipe Énergie et Systèmes Embarqués (LAAS-ESE), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Graz University of Technology [Graz] (TU Graz), Pontifícia Universidade Católica do Rio Grande do Sul [Porto Alegre] (PUCRS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), and Université Fédérale Toulouse Midi-Pyrénées

Subjects
Electromagnetics, Computer science, Logic block, Reliability (computer networking), Commercial Field-Programmable Gate Array (FPGA), 02 engineering and technology, 01 natural sciences, 0103 physical sciences, Hardware_INTEGRATEDCIRCUITS, 0202 electrical engineering, electronic engineering, information engineering, Field-programmable gate array, 010308 nuclear & particles physics, business.industry, Process (computing), 020206 networking & telecommunications, Reliability, Chip, GTEM Cell Test Method, [SPI.TRON]Engineering Sciences [physics]/Electronics, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Surface Scan Test Method, Electromagnetic emission (EME), Place and route, Routing (electronic design automation), business, Computer hardware, Logic place and route process
Abstract

International audience; Dense integration and high operating frequencies associated with increased number of I/O buffers of FPGAs are factors contributing to electromagnetic emission (EME) increase. Consequently the radiation issue that used to be discussed at PCB level has shifted to component level. Thus it is of high interest and challenging to investigate chip electromagnetic performance. This paper presents a preliminary analysis about the impact of the placement and routing (P&R) process of logic inside the FPGA on the chip EME level. With this purpose, a softcore processor was placed and routed based on three different strategies in the configurable logic block (CLB) array of a commercial FPGA and executed an application code running over an operating system (OS). Three experiments based on farand near-field emission measurements have been performed. The obtained results indicate that the EME level can be affected up to 21.8% by the way the processor is placed and routed inside the FPGA.

Published
2021

14. Game-Based Negotiation between Power Demand and Supply in Green Datacenters

Author

Georges Da Costa, Minh-Thuyen Thi, Jean-Marc Pierson, Système d’exploitation, systèmes répartis, de l’intergiciel à l’architecture (IRIT-SEPIA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), ANR-15-CE25-0012,DATAZERO,Datacenters robustes utilisant de l'énergie renouvelable(2015), Da Costa, Georges, and Datacenters robustes utilisant de l'énergie renouvelable - - DATAZERO2015 - ANR-15-CE25-0012 - AAPG2015 - VALID

Subjects
Computer science, Distributed computing, media_common.quotation_subject, Green Datacente, 02 engineering and technology, 7. Clean energy, Negotiation, Supply and demand, [INFO.INFO-DC] Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], 0202 electrical engineering, electronic engineering, information engineering, Game theory, media_common, business.industry, Quality of service, 020208 electrical & electronic engineering, Information technology, 020206 networking & telecommunications, Renewable energy, [INFO.INFO-OS] Computer Science [cs]/Operating Systems [cs.OS], Middleware, Carbon footprint, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], business, Efficient energy use
Abstract

International audience; The power consumption of datacenters is growingrapidly and becoming a major concern. For reducing carbonfootprint and increasing energy efficiency, a promising solutionis to locally supply datacenters with renewable energies. However,a challenging problem in building such green datacenter is thecoordinating between the power demand and the intermittentpower supply. To address this problem, we propose to modelthe green datacenter as two subsystems, namely, InformationTechnology (IT) subsystem which consumes energy, and electricalsubsystem which supplies energy. Then we aim to find an efficientcompromise between the power supply and power demand,taking into account the constraints of both subsystems. Basedon buyer-supplier game, we introduce a negotiation approach, inwhich the two subsystems are modeled as the energy buyer andenergy supplier. A negotiation algorithm is proposed, allowingthe two subsystems to negotiate and reach an efficient trade-off,while respecting their ownutility/monetary gain. The algorithmis evaluated in our middleware of renewable energies-powereddatacenter. The experimental results show that the proposedalgorithm allows the negotiation process to reach stable points.This algorithm also obtains significant improvement in thedatacenter’s utility and quality of service (QoS), compared tothe algorithms in which joint IT-energy management is notconsidered.

Published
2020

15. Stroboscopic Visibility Measure: assessment of pulsed light parameters

Author

Georges Zissis, Pascal Dupuis, Ngapuli I. Sinisuka, Handy Apryandi, Bandung Institute of Technology [Indonesia], LAboratoire PLasma et Conversion d'Energie (LAPLACE), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), Lumière et Matière (LAPLACE-LM), and Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3)

Subjects
Computer science, business.industry, Visibility (geometry), 0211 other engineering and technologies, Measure (physics), 02 engineering and technology, 01 natural sciences, Stroboscopic effect, Stroboscope, Light modulation, 010309 optics, Human health, Optics, Atmospheric measurements, 13. Climate action, Modulation, 021105 building & construction, 0103 physical sciences, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, business, ComputingMilieux_MISCELLANEOUS
Abstract

The widespread use of LED has raised concerns about possible negative impacts on human health. Temporal Light Modulation (TLMs) in which the stroboscopic effect included in it, has been widely discussed and assessed performance, health, and in terms of the safety aspect. Stroboscopic Effect Visibility Measure (SVM) was developed to provide an assessment of the stroboscopic effect. By adding the level confidence from participants to the observation of the stroboscopic effect can expand the assessment of the threshold of visibility, with more optimal results.

Published
2020

16. Anomaly detection for aircraft electrical generator using machine learning in a functional data framework

Author

Xavier Gendre, Feriel Boulfani, Martina Salvignol, Anne Ruiz-Gazen, AIRBUS Operations SAS, Toulouse, Institut de Mathématiques de Toulouse UMR5219 (IMT), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Toulouse School of Economics (TSE-R), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Recherche Agronomique (INRA)-École des hautes études en sciences sociales (EHESS)-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Toulouse School of Economics (TSE), École des hautes études en sciences sociales (EHESS)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse 1 Capitole (UT1), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées

Subjects
Imagination, Computer science, media_common.quotation_subject, failure detection, 0211 other engineering and technologies, generator oil tempera- ture prediction, Electric generator, Value (computer science), ComputerApplications_COMPUTERSINOTHERSYSTEMS, 02 engineering and technology, [MATH.MATH-FA]Mathematics [math]/Functional Analysis [math.FA], Machine learning, computer.software_genre, 050105 experimental psychology, law.invention, health monitoring, law, digital twin, Maintenance actions, 0501 psychology and cognitive sciences, media_common, 021103 operations research, Generator (computer programming), Artificial neural network, business.industry, Anomaly (natural sciences), 05 social sciences, machine learning, Anomaly detection, Artificial intelligence, business, computer
Abstract

International audience; To reduce the number of aircrafts on ground, the electrical design engineers are interested in predicting the oil temperature of the generator during a flight. Changes on the temperature value may indicate an incorrect functioning of the generator. An abnormal behavior can be identified by using machine learning algorithms trained on flights free from any anomalies to predict the generator oil temperature. These predictions can then be compared to the observed values, here the sensor data collected from the aircraft during flight. If the observed value is far from the predicted value, a failure warning is raised and a maintenance action shall be performed. In this paper, we build a digital twin of the electrical generator which predicts the oil generator temperature at a given time thanks to the history of features. We compare several machine learning algorithms and the most promising appears to be a neural network which was implemented as part of the electrical generator digital twin. The digital twin is tested by using real flight data containing generator failures and it is verified that the algorithm is able to detect an anomaly prior to the failure events (early failure detection).

Published
2020

17. Adaptive and Reconfigurable Systems and Architectures (AROSA 2020) : Summary Report

Author

Khalil Drira, Ismael Bouassida Rodriguez, Nesrine Khabou, Mohamed Jmaiel, Équipe Services et Architectures pour Réseaux Avancés (LAAS-SARA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Centre de Recherche en Numérique de Sfax (CRNS), Unité de Recherche en développement et contrôle d'applications distribuées (REDCAD), École Nationale d'Ingénieurs de Sfax | National School of Engineers of Sfax (ENIS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
business.industry, Computer science, Quality of service, [INFO.INFO-WB]Computer Science [cs]/Web, Control reconfiguration, Cloud computing, [INFO.INFO-SE]Computer Science [cs]/Software Engineering [cs.SE], computer.software_genre, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Adaptive system, [INFO.INFO-ET]Computer Science [cs]/Emerging Technologies [cs.ET], Software system, Web service, Resilience (network), Software engineering, business, Adaptation (computer science), computer
Abstract

International audience; The goal of this track is to bring together researchers and practitioners both from the Academia and from the Industry working in the areas of the adaptation and reconfiguration of distributed systems. Different investigation topics are involved, such as: CBSE, Web service, cloud applications, mobile applications, Functional and Non-Functional requirements (QoS, performance, resilience), monitoring, diagnosis, decision and execution of adaptation and reconfiguration. Different research areas are covered: concepts, methods, techniques, and tools to design, develop, deploy and manage adaptive and reconfigurable software systems.

Published
2020

18. Modular Multilevel SOI-CMOS Active Gate Driver Architecture for SiC MOSFETs

Author

Marc Cousineau, Yazan Barazi, Nicolas Rouger, Frédéric Richardeau, Convertisseurs Statiques (LAPLACE-CS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique (CNRS), and IRT Saint Exupéry - Institut de Recherche Technologique

Subjects
Materials science, Hardware_PERFORMANCEANDRELIABILITY, 02 engineering and technology, 01 natural sciences, 7. Clean energy, Switching time, Saturation current, 0103 physical sciences, MOSFET, Hardware_INTEGRATEDCIRCUITS, 0202 electrical engineering, electronic engineering, information engineering, Gate driver, SOI CMOS, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Power MOSFET, 010302 applied physics, SiC gate drivers, business.industry, [SPI.NRJ]Engineering Sciences [physics]/Electric power, 020208 electrical & electronic engineering, High voltage, multi-level, active gate driver, Optoelectronics, business, Short circuit, Hardware_LOGICDESIGN, Voltage
Abstract

International audience; High Voltage SiC power MOSFETs have specific driving challenges such as a reduced short circuit capability (compared to Si IGBTs) and a weak field oxide layer, a large gate to source driving voltage (compared to GaN FETs), a high electric field under negative gate bias in off-state and a high switching speed. The negative bias in off-state creates a high stress which reduces the reliability of the SiC MOSFET. The high positive gate bias can generate large drain saturation current in case of short circuit events. We propose a modular multilevel architecture, which takes benefits of SOI isolation and low voltage CMOS transistors to drive SiC MOSFETs and to improve their reliability using an active and dynamic multilevel-selection on the switching sequences and on/off states.

Published
2020

19. REHAD: Using Low-Frequency Reconfigurable Hardware for Cache Side-Channel Attacks Detection

Author

Vincent Migliore, Vincent Nicomette, Yuxiao Mao, Équipe Tolérance aux fautes et Sûreté de Fonctionnement informatique (LAAS-TSF), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), and Université Fédérale Toulouse Midi-Pyrénées

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Multi-core processor, Computer science, business.industry, RISC-V, 02 engineering and technology, Intrusion detection system, Reconfigurable computing, 020202 computer hardware & architecture, Software, Reconfigurable architecture, Embedded system, Intrusion detetion, 0202 electrical engineering, electronic engineering, information engineering, [INFO]Computer Science [cs], 020201 artificial intelligence & image processing, Side channel attack, Cache, Field-programmable gate array, business, Microarchitectural timing attacks
Abstract

International audience; Cache side-channel attacks consist, for a malicious process, to infer the current state of the cache by measuring the time it takes to access the memory, and indirectly gain knowledge about other processes sharing this same physical cache. Because cache side-channel attacks leverage a hardware leakage without requiring any physical access to the devices, they represent very serious threats. Among the runtime detection techniques for cache side-channel attacks, hardware solutions are usually fine-grained and benefit from less performance overhead than software solutions. However, they are not flexible enough to suit the rapid evolution and appearance of software attacks. In this paper we describe REHAD, a novel attack detection architecture that uses reconfigurable hardware. More precisely, it includes a hardware detection module that can be reconfigured by means of a trusted software kernel, to adapt to the level of threats and to detect new attacks. This architecture also benefits from hardware parallelism to fill the frequency gap between reconfigurable hardware and core processor. REHAD has been integrated into the ORCA softcore RISC-V on a FPGA and two common cache side-channel attacks have been successfully detected.

Published
2020

20. Substrate Integrated Waveguide Bandpass Filters implemented on Silicon Interposer for Terahertz Applications

Author

Mehmet Keynak, Anne-Laure Franc, Gaetan Prigent, Matthias Wietstruck, Équipe Microondes et Opto-microondes pour Systèmes de Télécommunications (LAAS-MOST), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Groupe de Recherche en Electromagnétisme (LAPLACE-GRE), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Innovations for High Performance Microelectronics (IHP), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP)

Subjects
Materials science, Silicon, Terahertz radiation, business.industry, 020208 electrical & electronic engineering, Si-based Integrated Passive Devices, chemistry.chemical_element, Filters, 020206 networking & telecommunications, 02 engineering and technology, Substrate (electronics), law.invention, Reduction (complexity), [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Resonator, chemistry, Band-pass filter, law, 0202 electrical engineering, electronic engineering, information engineering, Insertion loss, Optoelectronics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, SIW, business, Waveguide
Abstract

International audience; This paper deals with the design of Substrate Integrated Waveguide (SIW) bandpass filter for D-band (140 GHz) and terahertz (280 GHz and 420 GHz) applications. The filters are implemented in High Resistivity (HR) Silicon interposer technology provided by IHP foundry using Through Silicon Vias (TSV). Filters with 3 dB relative bandwidth of 5% and 10% are designed. A comparison of the filters performance is made for the different frequency range. It evidences the interest of SIW technology in sub-millimeter wave domain towards the resonator quality factor increase and, therefore, insertion loss reduction for filters.

Published
2020

21. 4-Port Vector Antenna for MIMO Applications

Author

Hervé Aubert, Christophe Morlaas, J. Duplouy, Ecole Nationale de l'Aviation Civile (ENAC), Équipe MIcro et Nanosystèmes pour les Communications sans fil (LAAS-MINC), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
Computer science, business.industry, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, MIMO, Mimo antenna, 020206 networking & telecommunications, Data_CODINGANDINFORMATIONTHEORY, 02 engineering and technology, Port (computer networking), [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Channel capacity, Hardware_GENERAL, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Wireless, Wideband, Antenna (radio), business, Polarization diversity, Computer Science::Information Theory
Abstract

International audience; A wideband 4-port vector antenna previously re-ported for radio-goniometry applications using four ports is investigated here for MIMO applications. Thank to the polarization diversity capabilities inherent to vector antennas, the MIMO performances are very good for wideband frequency operation.The main metrics that are generally used for MIMO antennas are reported. These characteristics enable the 3D-half-space angular coverage

Published
2020

22. Reconstructing Natural Scenes from fMRI Patterns using BigBiGAN

Author

Milad Mozafari, Rufin VanRullen, Leila Reddy, Centre de recherche cerveau et cognition (CERCO), Institut des sciences du cerveau de Toulouse. (ISCT), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), ANR-19-P3IA-0004,ANITI,Artificial and Natural Intelligence Toulouse Institute(2019), VANRULLEN, Rufin, and Artificial and Natural Intelligence Toulouse Institute - - ANITI2019 - ANR-19-P3IA-0004 - P3IA - VALID

Subjects
[INFO.INFO-AI] Computer Science [cs]/Artificial Intelligence [cs.AI], FOS: Computer and information sciences, 0301 basic medicine, Computer science, Computer Vision and Pattern Recognition (cs.CV), Computer Science - Computer Vision and Pattern Recognition, Computer Science - Human-Computer Interaction, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Iterative reconstruction, Human-Computer Interaction (cs.HC), [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI], Image (mathematics), [SCCO]Cognitive science, 03 medical and health sciences, 0302 clinical medicine, FOS: Electrical engineering, electronic engineering, information engineering, Artificial neural network, business.industry, Image and Video Processing (eess.IV), Pattern recognition, [SCCO] Cognitive science, Electrical Engineering and Systems Science - Image and Video Processing, Linear map, 030104 developmental biology, FOS: Biological sciences, Quantitative Biology - Neurons and Cognition, Principal component analysis, Neurons and Cognition (q-bio.NC), Artificial intelligence, business, 030217 neurology & neurosurgery, Decoding methods, Generative grammar
Abstract

Decoding and reconstructing images from brain imaging data is a research area of high interest. Recent progress in deep generative neural networks has introduced new opportunities to tackle this problem. Here, we employ a recently proposed large-scale bi-directional generative adversarial network, called BigBiGAN, to decode and reconstruct natural scenes from fMRI patterns. BigBiGAN converts images into a 120-dimensional latent space which encodes class and attribute information together, and can also reconstruct images based on their latent vectors. We computed a linear mapping between fMRI data, acquired over images from 150 different categories of ImageNet, and their corresponding BigBiGAN latent vectors. Then, we applied this mapping to the fMRI activity patterns obtained from 50 new test images from 50 unseen categories in order to retrieve their latent vectors, and reconstruct the corresponding images. Pairwise image decoding from the predicted latent vectors was highly accurate (84%). Moreover, qualitative and quantitative assessments revealed that the resulting image reconstructions were visually plausible, successfully captured many attributes of the original images, and had high perceptual similarity with the original content. This method establishes a new state-of-the-art for fMRI-based natural image reconstruction, and can be flexibly updated to take into account any future improvements in generative models of natural scene images., Accepted to IEEE IJCNN2020

Published
2020

23. Experimental Investigations on Lasers FM and AM Noise

Author

Olivier Llopis, Gilles Bailly, Alexis Bougaud, Arnaud Fernandez, Équipe Microondes et Opto-microondes pour Systèmes de Télécommunications (LAAS-MOST), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Service Instrumentation Conception Caractérisation (LAAS-I2C), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
Materials science, 02 engineering and technology, frequency noise, law.invention, noise characterization, fiber laser, [SPI]Engineering Sciences [physics], 020210 optoelectronics & photonics, Optics, law, Fiber laser, Phase noise, 0202 electrical engineering, electronic engineering, information engineering, Frequency offset, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, semiconductor laser, amplitude noise, business.industry, Noise spectral density, Laser, phase noise, laser, Noise, Amplitude, Fm noise, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, business
Abstract

International audience; Different 1550 nm fibered lasers are compared versus their performances in terms of frequency (FM) noise and amplitude (AM) noise. The noise spectral density is spread over six to height decades for the FM noise and three to four decades for the AM noise, depending on the frequency offset. The lasers featuring the best FM noise performance are generally the worst versus the AM noise performance, although some compromises can be found.

Published
2020

24. Fine-Grained Fault Tolerance for Resilient pVM-Based Virtual Machine Monitors

Author

Djob Mvondo, Alain Tchana, Renaud Lachaize, Daniel Hagimont, Noel De Palma, Efficient and Robust Distributed Systems (ERODS ), Laboratoire d'Informatique de Grenoble (LIG), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Algorithms and Software Architectures for Distributed and HPC Platforms (AVALON), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Laboratoire de l'Informatique du Parallélisme (LIP), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Système d’exploitation, systèmes répartis, de l’intergiciel à l’architecture (IRIT-SEPIA), 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), Institut National Polytechnique (Toulouse) (Toulouse INP), 'Studio virtuel' project of BPI and ERDF/FEDER, grant agreement number16.010402.01, HYDDA project (Développement d’une plateforme combinant intelligemment HPC et Cloud computing) of BPI Grant, IDEX IRS: Initiative de Recherche Stratégique (COMUE UGA grant), ANR-18-CE25-0016,Scalevisor,Scalevisor: un hyperviseur pour rack désagrégé(2018), Centre National de la Recherche Scientifique (CNRS)-Université de Lyon-Institut National de Recherche en Informatique et en Automatique (Inria)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Centre National de la Recherche Scientifique (CNRS)-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École normale supérieure - Lyon (ENS Lyon), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), and Université Fédérale Toulouse Midi-Pyrénées

Subjects
Software_OPERATINGSYSTEMS, Computer science, Performance, Cloud computing, Disagreggation, 02 engineering and technology, computer.software_genre, Virtualization, 020204 information systems, Component (UML), 0202 electrical engineering, electronic engineering, information engineering, [INFO]Computer Science [cs], Resilience (network), Resilience, business.industry, Design pattern, Hypervisor, Fault tolerance, 020202 computer hardware & architecture, Virtual machine, Operating system, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Bare metal, business, computer
Abstract

International audience; Virtual machine monitors (VMMs) play a crucial role in the software stack of cloud computing platforms: their design and implementation have a major impact on performance, security and fault tolerance. In this paper, we focus on the latter aspect (fault tolerance), which has received less attention, although it is now a significant concern. Our work aims at improving the resilience of the "pVM-based" VMMs, a popular design pattern for virtualization platforms. In such a design, the VMM is split into two main components: a bare-metal hypervisor and a privileged guest virtual machine (pVM). We highlight that the pVM is the least robust component and that the existing fault-tolerance approaches provide limited resilience guarantees or prohibitive overheads. We present three design principles (disaggregation, specialization, and pro-activity), as well as optimized implementation techniques for building a resilient pVM without sacrificing end-user application performance. We validate our contribution on the mainstream Xen platform.

Published
2020

25. Characterization and Optical Early Diagnosis by Diffuse Reflectance Spectroscopy

Author

Jeremie T. Zoueu, Didier K. Yable, Pascal Dupuis, Georges Zissis, Theodore Cisse Haba, Laurent Canale, LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Université Félix Houphouët-Boigny (UFHB), Centre National de la Recherche Scientifique (CNRS), Lumière et Matière (LAPLACE-LM), and Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3)

Subjects
Optical fiber, Materials science, Diffuse reflectance infrared fourier transform, Spectrometer, business.industry, Multispectral image, 01 natural sciences, Signal, law.invention, Characterization (materials science), 010309 optics, 03 medical and health sciences, 0302 clinical medicine, Optics, law, 030220 oncology & carcinogenesis, 0103 physical sciences, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie, Diffuse reflection, business, ComputingMilieux_MISCELLANEOUS, Light-emitting diode
Abstract

Diffuse reflectance spectroscopy (DRS) is a technique that illuminates the surface of the tissue and analyzes the spectrum of backscattered light, in which the signature of various biochemical species can be identified. This promising technique is established in this article for the non-invasive and in vivo characterization of the optical properties of tissues for diagnostic applications. We have introduced a new compact and inexpensive architecture for DRS based on the use of a multispectral image sensor and LEDs to obtain a diffuse reflectance signal in contact with the skin. For the proof of concept, a prototype device, involving a spectrometer coupled to an optical fiber, a microcontroller, a set of 8 LEDs and a computer, was developed, manufactured and set up. Diffuse reflectance profiles were acquired at 438.2 nm, 544.5 nm and 613.7 nm. Indeed, the spectrum of Mycobacterium ulcerans was established by this method at 256 nm and 365.2 nm. The results obtained confirm the potential of our approach for the quantitative characterization of the optical properties of tissues.

Published
2020

26. An Optically Transparent Antenna Integrated in OLED Light Source for 5G Applications

Author

Georges Zissis, Laurent Canale, Mustapha El Halaoui, Adel Asselman, LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique (CNRS), Faculté des Sciences de Tétouan, Lumière et Matière (LAPLACE-LM), and Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3)

Subjects
Materials science, business.industry, 020206 networking & telecommunications, 02 engineering and technology, Substrate (electronics), 021001 nanoscience & nanotechnology, 7. Clean energy, Directivity, Light source, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, 0202 electrical engineering, electronic engineering, information engineering, OLED, Optoelectronics, Stimulated emission, Reflection coefficient, Antenna (radio), 0210 nano-technology, business, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, ComputingMilieux_MISCELLANEOUS, 5G
Abstract

In this paper, a new concept of an optically transparent antenna integrated in OLED (Organic Light Emitting Diodes) is proposed for the 5G mobile applications. This proposed antenna is designed for future millimeter-wave (mm-Wave) 5G applications. The proposed optically transparent antenna is a network of micrometric hexagonal cells deposited on a glass substrate. By using this hexagonal geometry, we obtained a theoretical optical transparency of about 920%. This antenna can cover the 28 GHz band from 27.43 GHz to 28.88 GHz with a width of 1.45 GHz. The suggested design has a gain and directivity about 5.07 dB and 6.27 dBi at 28.27 GHz, respectively.

Published
2020

27. A User-Centric Identity Management Framework based on the W3C Verifiable Credentials and the FIDO Universal Authentication Framework

Author

Samer Wazan, Abdelmalek Benzekri, Francois Barrere, Arnaud Oglaza, Romain Laborde, Rémi Venant, David W. Chadwick, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), University of Kent (UNITED KINGDOM), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Université Nantes Angers Le Mans - UNAM (FRANCE), Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), University of Kent [Canterbury], Laboratoire d'Informatique de l'Université du Mans (LIUM), and Le Mans Université (UM)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Computer science, Système d'exploitation, Verifiable credentials, Réseaux et télécommunications, Federated Identity Management, 0102 computer and information sciences, Certification, Computer security, computer.software_genre, 01 natural sciences, Identity management, QA76, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, 0501 psychology and cognitive sciences, 050107 human factors, User-centered design, Password, Authentication, business.industry, 05 social sciences, Usability, Service provider, Systèmes embarqués, FIDO UAF, Digital identity, 010201 computation theory & mathematics, Federated identity management, Verifiable secret sharing, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business, computer
Abstract

International audience; We present a user-centric and decentralized digital identity system that allows anyone to easily benefit from an enriched digital identity made of multi-purpose and multi-origin attributes. It increases usability by the elimination of user passwords. It also makes this digital identity highly trustworthy both for the user (in terms of privacy and sovereignty) and the service provider who requires highly certified information about the user being enrolled to and/or authenticated on its services. We built our system based on the Universal Authentication Framework specified by the FIDO Alliance and the data model proposed by the W3C Verifiable Credentials WG. The whole system has been implemented in a banking scenario.

Published
2020

28. Thermal Characterization of the Birefringence of Nematic Liquid Crystals for the Design of Widely-tunable LC-VCSELs

Author

Jean-Baptiste Doucet, Alberto Tibaldi, Thierry Camps, Pierluigi Debernardi, Véronique Bardinal, Andrea Simaz, Benjamin Boisnard, B. Reig, Équipe MICrosystèmes d'Analyse (LAAS-MICA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Politecnico di Torino = Polytechnic of Turin (Polito), Université Toulouse III - Paul Sabatier (UT3), Service Techniques et Équipements Appliqués à la Microélectronique (LAAS-TEAM), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
Birefringence, Materials science, business.industry, 02 engineering and technology, 01 natural sciences, Reflectivity, Spectral line, [SPI.MAT]Engineering Sciences [physics]/Materials, [SPI.TRON]Engineering Sciences [physics]/Electronics, Vertical-cavity surface-emitting laser, Characterization (materials science), 010309 optics, 020210 optoelectronics & photonics, Operating temperature, Liquid crystal, 0103 physical sciences, Thermal, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, 0202 electrical engineering, electronic engineering, information engineering, Optoelectronics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, business
Abstract

International audience; In this work, the thermo-optical properties of nematic liquid crystals are investigated through localized reflectance spectra measurements performed on a tunable LC-filter. The final aim is to insert such LC in the cavity of a tunable VCSEL device, in which local self-heating due to optical or electrical pumping must be taken into account. We demonstrate that, whereas standard LC E7 is not suited for real device operation, the maximal operating temperature of QYDPLC-36 LC is 95°C, with a birefringence at 1.55 μm higher than 0.18 at 60°C.

Published
2020

29. Optical Design Issues in Electrically Pumped Tunable Liquid-Crystal VCSELs

Author

Jean-Baptiste Doucet, Alberto Tibaldi, B. Reig, Véronique Bardinal, Francesco Bertazzi, Michele Goano, Thierry Camps, Benjamin Boisnard, Andrea Simaz, Pierluigi Debernardi, Politecnico di Torino = Polytechnic of Turin (Polito), Équipe MICrosystèmes d'Analyse (LAAS-MICA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), Service Techniques et Équipements Appliqués à la Microélectronique (LAAS-TEAM), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
Liquid crystal devices, Materials science, 02 engineering and technology, Semiconductor laser theory, Vertical-cavity surface-emitting laser, law.invention, [SPI.MAT]Engineering Sciences [physics]/Materials, 03 medical and health sciences, 020210 optoelectronics & photonics, 0302 clinical medicine, Optical coherence tomography, Liquid crystal, law, Vertical cavity surface emitting lasers, Liquid crystal devices, Semiconductor lasers, Simulation, Vertical cavity surface emitting lasers, 0202 electrical engineering, electronic engineering, information engineering, medicine, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Semiconductor lasers, medicine.diagnostic_test, business.industry, Solver, Laser, [SPI.TRON]Engineering Sciences [physics]/Electronics, 030221 ophthalmology & optometry, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Optoelectronics, business, Lasing threshold, Simulation
Abstract

International audience; In this work we investigate a tunable 850nm laser based on a hybrid combination of a liquid crystal micro-cell and a half GaAs VCSEL. The target application is optical coherence tomography. The inherent tolerances of the hybrid technology, the presence of metals in the cavity and the need for a pure extraordinary mode lasing make challenging the optical design of this laser. Hence, VELM, a full 3D and vectorial VCSEL optical solver, is utilized to understand loss mechanisms and provide an optimized design.

Published
2020

30. Transparent and Dynamic Deployment of Lightweight Transport Protocols

Author

Christophe Chassot, Samir Medjiah, El-Fadel Bonfoh, Djolo Cédric Tape, Équipe Services et Architectures pour Réseaux Avancés (LAAS-SARA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
UDP Lite, computer.internet_protocol, business.industry, Computer science, QUIC, Linux kernel, Linux OS, dynamic deployment, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Kernel (image processing), Software deployment, Transport layer, Transport protocols, The Internet, TCP/UDP, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], eBPF, business, UDP-Lite, computer, Computer network
Abstract

International audience; The adoption of new Transport protocols on the Internet remains a critical challenge and their effective deployment is very slow. Till now, despite its known limitations and the plethora of existing alternatives like QUIC or DCTCP, almost 90% of applications transmissions are based on TCP. From this observation, we assert that redirecting TCP-connection to another Transport protocol may accelerate the deployment and the adoption of any new Transport protocols in the Internet. The selected Transport protocol towards which the redirection is performed may either already exist in the OS or dynamically be deployed on it. Recently introduced in the Linux kernel, eBPF technology provides the abilities to insert at runtime functionalities in the kernel from userspace programs. In this paper, we propose a preliminary design of a eBPF-based framework to perform our approach. Following this design, we implement a prototype that safely (1) perform transparent redirection of TCP connections either to the OS native UDP or to UDP-Lite; the later one is (2) dynamically deployed as eBPF programs. This first prototype, developed on Linux 5.0, has the worth to demonstrate our concept but suffer from performances issues to which we formulate some solutions and open up the associated research questions. Nevertheless, we believe that our approach may lead to innovation at the Internet Transport layer.

Published
2019

31. An Analog CMOS Voltage-Controlled Phase-Shifter With A 100° Tuning Range For Telecommunication Baseband Signal Processing

Author

Helene Tap, Olivier D. Bernal, Blaise Mulliez, Équipe Optoélectronique pour les Systèmes Embarqués (LAAS-OSE), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Ecole Nationale Supérieure d'Electrotechnique, d'Electronique, d'Informatique, d'Hydraulique et de Télécommunications (ENSEEIHT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, ENSEEIHT, and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées

Subjects
Materials science, 02 engineering and technology, phase linearization, law.invention, EOTA, law, Hardware_INTEGRATEDCIRCUITS, 0202 electrical engineering, electronic engineering, information engineering, DDCC, All-pass filter, business.industry, ASIC, Amplifier, Phase-shifter, CMOS, 020208 electrical & electronic engineering, Linearity, 020206 networking & telecommunications, [SPI.TRON]Engineering Sciences [physics]/Electronics, Baseband, Resistor, Telecommunications, business, Phase shift module, Voltage
Abstract

International audience; In order to correct phase non-linearities due to High Power Amplifiers (HPA) operating near saturation in telecommu-nication transceivers, a voltage-controlled phase-shifter based on Differential Difference Current Conveyors (DDCC) and a tunable resistor were developed. In order to suit a large variety of HPAs with broad phase non-linearities, the circuit's tuning capability has even been optimized up to an unprecedented 100 • while maintaining a good linearity (THD

Published
2019

32. Electric field enhancements due to space charge in thin polyimide film

Author

Kunihiro Tajiri, Sombel Diaham, Virginie Griseri, Gilbert Teyssedre, D. Marty-Dessus, F. Carrasco, Laurent Berquez, Marie-Laure Locatelli, Hirotaka Muto, Thierry Lebey, Advanced Technology R&D Center - Mitsubishi Electric [Japan], Mitsubishi Electric [France], LAboratoire PLasma et Conversion d'Energie (LAPLACE), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Diélectriques Solides et Fiabilité (LAPLACE-DSF), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), and Matériaux Diélectriques dans la Conversion d’Energie (LAPLACE-MDCE)

Subjects
010302 applied physics, Materials science, Passivation, business.industry, [SPI.NRJ]Engineering Sciences [physics]/Electric power, 0211 other engineering and technologies, 02 engineering and technology, Semiconductor device, 01 natural sciences, Space charge, [SPI.MAT]Engineering Sciences [physics]/Materials, [SPI]Engineering Sciences [physics], Electric field, Laser intensity, 0103 physical sciences, Optoelectronics, 021108 energy, business, ComputingMilieux_MISCELLANEOUS, Polyimide, Voltage
Abstract

Polyimide (PI) is widely used in film form as a passivation material for power semiconductor devices of Si, SiC, GaN, etc. The magnitude of the electric field at the edge termination area of these semiconductor devices is becoming higher and higher due to the increase of operational voltage and /or demand for shrinking the edge termination area to increase device active area. Hence it is concerned that space charge accumulation in the encapsulation and passivation material affects the insulation performance of those devices. In this report, space charge distribution and electric field enhancement associated with the charge accumulation have been investigated for thin PI film with thicknesses of about 20 μm, using Laser Intensity Modulation Method (LIMM). It is shown that the enhancement factor of the internal electric field (the maximum internal electric field divided by the applied field) in PI film is negligibly small (less than 1.1) for applied fields less than 10 kV/mm. However, it can reach much higher like 1.4 at higher applied field like 25 kV/mm. This result implies that electric field at edge termination area should be carefully designed under such an operational electric field as is the case of SiC devices.

Published
2019

33. Wideband and Compact 3-D Quadrature Coupler for 5G Applications

Author

Thierry Parra, Christophe Viallon, Alessandro Magnani, Ayad Ghannam, Audrey Cayron, Équipe Microondes et Opto-microondes pour Systèmes de Télécommunications (LAAS-MOST), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, 3DiS Technologies, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
integrated passive device (IPD), 02 engineering and technology, 7. Clean energy, law.invention, law, K band, 0202 electrical engineering, electronic engineering, information engineering, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Wideband, Transformer, Phase difference, Physics, 5G mobile application, business.industry, 020208 electrical & electronic engineering, Electrical engineering, 020206 networking & telecommunications, Ranging, [SPI.TRON]Engineering Sciences [physics]/Electronics, Capacitor, Compact space, transformer, K-band, 3-D technology, quadrature couplers, business, 5G
Abstract

EuMC Young Engineer Prize; International audience; A wideband and compact quadrature coupler intended for 5G applications is presented. The circuit is integrated using a dedicated cost-effective three-dimensional (3-D) technology and is implemented from a 3-D transformer along with Metal-Insulator-Metal (MIM) capacitors that ensure a very good compactness. The coupler's area does not exceed 0.11 mm 2. The measurements show good performance over a bandwidth of 7GHz ranging from 19.5GHz to 26.5GHz. Within this whole band, insertion losses remain better than 0.6dB whereas a phase difference between both outputs of 90° is achieved with a maximum deviation of 3°.

Published
2019

34. A New Bayesian Modeling for 3D Human-Object Action Recognition

Author

Francisco Madrigal, Camille Maurice, Frédéric Lerasle, André Monin, Équipe Robotique, Action et Perception (LAAS-RAP), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
0209 industrial biotechnology, Computer science, business.industry, media_common.quotation_subject, Bayesian probability, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Probabilistic logic, [INFO.INFO-CV]Computer Science [cs]/Computer Vision and Pattern Recognition [cs.CV], 02 engineering and technology, Machine learning, computer.software_genre, Bayesian inference, Object (computer science), 020901 industrial engineering & automation, Action (philosophy), Perception, 0202 electrical engineering, electronic engineering, information engineering, Action recognition, RGB color model, 020201 artificial intelligence & image processing, Artificial intelligence, business, computer, media_common
Abstract

International audience; Intelligent surveillance systems in human-centered environments require people behavioral monitoring. In this paper, we propose a new Bayesian framework to recognize actions on RGB-D videos by two different observations: the human pose and objects in its vicinity. We design a model for each action that integrates these observations and a probabilistic sequencing of actions performed during activities. We validate our approach on two public video datasets: CAD-120 and Watch-n-Patch. We show a performance gain of 4% in action detection on the fly on CAD-120 videos. Our approach is competitive to 2D image features and skeleton-based methods, as we present an improvement of 16% on Watch-n-Patch. Action recognition performance is clearly improved by our Bayesian and joint human-object perception.

Published
2019

35. Attack Injection into Avionic Systems through Application Code Mutation

Author

Vincent Nicomette, Eric Alata, Nathalie Feyt, Mohamed Kaaniche, Alienor Damien, THALES, Équipe Tolérance aux fautes et Sûreté de Fonctionnement informatique (LAAS-TSF), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, THALES [France], Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
business.industry, Computer science, media_common.quotation_subject, 02 engineering and technology, Intrusion detection system, Avionics, [INFO.INFO-CR]Computer Science [cs]/Cryptography and Security [cs.CR], Software, 020204 information systems, Embedded system, Threat model, 0202 electrical engineering, electronic engineering, information engineering, Code (cryptography), [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, business, Function (engineering), Host (network), Vulnerability (computing), media_common
Abstract

International audience; Given the continuous increase of malicious threats targeting embedded systems, the potential malicious modification of an aircraft application, by exploiting an unknown software or hardware vulnerability of the execution platform, must be seriously considered for future systems. Indeed, an insider attack breaking the organization's security measures to insert a malicious function on board could have significant consequences. Various solutions can be investigated to provide enhanced protection against such threats, including intrusion detection techniques. To design an Intrusion Detection System (IDS), and more specifically to evaluate its performance, abnormal data are required. However, to our knowledge, there is no publicly available attack data for aircraft applications. This paper proposes an approach and a tool aiming at automatically performing application code mutations that mimic the behavior of malevolent pieces of code introduced inside an application. The approach relies on three code modification strategies, designed to cover both generic and specific mutations. The tool takes into account the specific characteristics of avionic applications (dedicated hardware, real-time execution, threat model). This paper describes the architecture and implementation details of the tool, as well as some experiments, in which it is used in order to calibrate a Host-based Intrusion Detection System (HIDS) that we are currently implementing. For that purpose, specific code changes are introduced, targeting application integrity and availability as well as safety.

Published
2019

36. On Single-Image Super-Resolution in 3D Brain Magnetic Resonance Imaging

Author

Denis Kouame, Adrian Basarab, Muriel Mescam, Farah Bazzi, (OATAO), Open Archive Toulouse Archive Ouverte, CoMputational imagINg anD viSion (IRIT-MINDS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse Capitole (UT Capitole), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Toulouse Mind & Brain Institut (TMBI), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse Capitole (UT Capitole), Université Fédérale Toulouse Midi-Pyrénées, Centre de recherche cerveau et cognition (CERCO), Institut des sciences du cerveau de Toulouse. (ISCT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre Hospitalier Universitaire de Toulouse (CHU Toulouse)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre Hospitalier Universitaire de Toulouse (CHU Toulouse)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[INFO.INFO-TS] Computer Science [cs]/Signal and Image Processing, Computer science, Low rank, Tensors, Regularization (mathematics), 030218 nuclear medicine & medical imaging, White matter, 03 medical and health sciences, Segmentation, 0302 clinical medicine, [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, Image Processing, Computer-Assisted, medicine, Humans, Traitement du signal et de l'image, Gray Matter, Image resolution, Image restoration, Ground truth, medicine.diagnostic_test, business.industry, Brain, Single image super-resolution, Pattern recognition, Magnetic resonance imaging, Total variation regularization, Image segmentation, Total variation denoising, Inverse problem, Magnetic Resonance Imaging, White Matter, Superresolution, 030227 psychiatry, Structural MRI, medicine.anatomical_structure, Artificial intelligence, business, Algorithms
Abstract

International audience; The objective of this work is to apply 3D super resolution (SR) techniques to brain magnetic resonance (MR) image restoration. Two 3D SR methods are considered following different trends: one recently proposed tensor-based approach and one inverse problem algorithm based on total variation and low rank regularization. The evaluation of their effectiveness is assessed through the segmentation of brain compartments: gray matter, white matter and cerebrospinal fluid. The two algorithms are qualitatively and quantitatively evaluated on simulated images with ground truth available and on experimental data. The originality of this work is to consider the SR methods as an initial step towards the final segmentation task. The results show the ability of both methods to overcome the loss of spatial resolution and to facilitate the segmentation of brain structures with improved accuracy compared to native low-resolution MR images. Both algorithms achieved almost equivalent results with a highly reduced computational time cost for the tensor-based approach.

Published
2019

37. Divide to Conquer: Functional Decomposition to Support Model-Based Engineering of Command and Control of Cyber-Physical Systems

Author

Christine Gris, Alexandre Canny, Camille Fayollas, Célia Martinie, Yannick Deleris, Philippe Palanque, David Navarre, Airbus (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Interactive Critical Systems (IRIT-ICS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, and Airbus [France]

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Computer science, Distributed computing, [INFO.INFO-SE]Computer Science [cs]/Software Engineering [cs.SE], Interactive systems, Functional decomposition, Interface homme-machine, law.invention, [INFO.INFO-CR]Computer Science [cs]/Cryptography and Security [cs.CR], Software, Architectures Matérielles, law, Command and control, Génie logiciel, [INFO.INFO-HC]Computer Science [cs]/Human-Computer Interaction [cs.HC], business.industry, Cyber-physical system, Modélisation et simulation, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, Systèmes embarqués, Cockpit, Cryptographie et sécurité, Task analysis, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, CPS, User interface, business, Remote control
Abstract

International audience; Cyber-physical systems (CPS) integrate both physical and computational elements and their engineering requires bridging the continuous analog real world and the discrete digital world. User interfaces of cyber-physical systems belong to the class of command and control systems and their design and engineering usually follow ad-hoc craft processes highly parametrized by the very nature of the physical component(s). This paper proposes a systematic approach for engineering CPS, emphasizing the problems and possible solutions to design and assess their user interfaces (both control and presentation). The paper first proposes a generic architecture for CPS going from the physical element(s) to the user interface. This architecture is then refined, highlighting the behavior and software interfaces of each of its component and showing how information and control from the physical elements have to be processed and transformed to make sense to the operator. The paper presents extracts of the application of the proposed approach to the command and control cockpit application of an aircraft system.

Published
2019

38. Characterization in ZVS Mode of SiC MOSFET Modules for MVDC Applications

Author

J-M. Blaquiere, Philippe Ladoux, Sebastien Sanchez, Andrea Verdicchio, Joseph Fabre, LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, SNCF Réseau [La Plaine st Denis], Convertisseurs Statiques (LAPLACE-CS), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), and Institut Catholique d'Arts et Métiers (ICAM)

Subjects
Computer science, 02 engineering and technology, traction power supplies, 7. Clean energy, Energy storage, law.invention, Rail transportation, [SPI]Engineering Sciences [physics], Electric power system, law, Optical switches, 0202 electrical engineering, electronic engineering, information engineering, Power MOSFET, Transformer, power MOSFET, switching convertors, business.industry, [SPI.NRJ]Engineering Sciences [physics]/Electric power, 020208 electrical & electronic engineering, Electrical engineering, DC-DC power convertors, Converters, AC power, Zero voltage switching, Power supplies, power transformers, Bridge circuits, smart power grids, Smart grid, railway electrification, Power module, silicon compounds, business, Gate drivers
Abstract

International audience; In order to improve the energy efficiency of the railway traction power supply, a DC voltage of 9 kV has recently been proposed. Beyond train power supply, this new power system will allow to connect several sources and/or loads (AC power grid, energy storage, wind farm, solar panels, etc.). This new railway “smart grid” will require insulated DC-DC converters operating in a medium frequency range (from 10 to 20 kHz) to reduce the size of the passive components (mainly the transformer). In the voltage and power ranges targeted, this is now possible thanks to the arrival on the market of power modules based on SiC MOSFETs. Therefore, this paper focuses on the operation in ZVS mode of two power modules (1.7 kV / 1100 A and 3.3 kV / 750 A). The first part of the paper is devoted to the design of a driver for Zero Voltage Switching. In a second part, a test bench is presented. It allows to measure the switching energies in this operating mode. Finally, from these results, it is then possible to determine the efficiency of resonant DC/DC converters, which can be used in the MVDC power system.

Published
2019

39. Series Resonant Inverter Efficiency Improvement with Valley Switching for Dielectric Barrier Discharges

Author

Andallah Diop, Rafael Diez, Hubert Piquet, Vanesa Rueda, Pontificia Universidad Javeriana (PUJ), Groupe ENergie Electrique et SYStémique (LAPLACE-GENESYS), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Pontificia Universidad Javeriana, and Pontificia Universidad Javeriana Bogota, Colombia

Subjects
Dielectric Barrier Discharge, Electric Discharge Power Supply, Materials science, Excimer Lamp, 02 engineering and technology, Dielectric barrier discharge, Dielectric, 01 natural sciences, 010305 fluids & plasmas, Stress (mechanics), [SPI]Engineering Sciences [physics], 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, ComputingMilieux_MISCELLANEOUS, Resonant inverter, Current mode, Series (mathematics), business.industry, [SPI.NRJ]Engineering Sciences [physics]/Electric power, [SPI.PLASMA]Engineering Sciences [physics]/Plasmas, 020208 electrical & electronic engineering, Resonant Inverter, Ultra Violet Generation (UV), Inductance, Optoelectronics, DBD, business, Voltage
Abstract

International audience; This paper presents the analysis of a Series Resonant Inverter for Dielectric Barrier Discharge (DBD) applications, operating in discontinuous current mode. The study of different factors that can improve the efficiency and behavior of the converter are presented. First, the implementation of the converter is studied with two possible locations of the resonant inductance. The inductance location can be used to decrease the stress voltage of the switching components. Additionally, the effects of the parasitic elements are stated and the use of the Valley Switching technique to reduce the turn-on switching losses is proposed. Experimental results are included, showing the system improvements.

Published
2019

40. Performance of MOX Gas Sensors Obtained by Mixing P-Type and N-Type Metal Oxides for Relaible Indoor Air Quality Monitoring

Author

Pierre Fau, Myrtil L. Kahn, Philippe Menini, Chaabane Talhi, Frédéric Blanc, Vincent Bley, Katia Fajerwerg, Aymen Sendi, Équipe MICrosystèmes d'Analyse (LAAS-MICA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Matériaux Diélectriques dans la Conversion d’Energie (LAPLACE-MDCE), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Service Instrumentation Conception Caractérisation (LAAS-I2C), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), and Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP)

Subjects
Materials science, Mixing (process engineering), Hardware_PERFORMANCEANDRELIABILITY, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Metal, Indoor air quality, Hardware_INTEGRATEDCIRCUITS, ComputerSystemsOrganization_SPECIAL-PURPOSEANDAPPLICATION-BASEDSYSTEMS, Relative humidity, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, MOX fuel, business.industry, hybrid n-type and p-type MOX, Humidity, Heterojunction, 021001 nanoscience & nanotechnology, 0104 chemical sciences, gas sensors, Semiconductor, visual_art, visual_art.visual_art_medium, Optoelectronics, 0210 nano-technology, business, Hardware_LOGICDESIGN
Abstract

In this work, we study the effect of n-p heterojunctions in metal oxides semiconductors (MOS) gas sensors, and particularly on their gas sensitivity and relative humidity dependence for indoor air quality applications. This effect depends on the relative proportion of MOS in the mixture between SnO 2 , CuO and ZnO. This study was achieved in order to build a MOS gas sensors that overcomes the effects of humidity variations and to improve the overall sensitivity of MOS gas sensors.

Published
2019

41. Study of the coupling of wide band Near Field Scan probe dedicated to the investigation of the radiated immunity of Printed Circuit Boards

Author

Andre Durier, Sonia Ben Dhia, Tristan Dubois, IRT Saint Exupéry - Institut de Recherche Technologique, Laboratoire de l'intégration, du matériau au système (IMS), Université Sciences et Technologies - Bordeaux 1-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Équipe Énergie et Systèmes Embarqués (LAAS-ESE), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, FAVRE, Isabelle, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)

Subjects
Coupling, 030222 orthopedics, [SPI] Engineering Sciences [physics], Computer science, business.industry, [SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Electrical engineering, Automotive industry, Near and far field, Integrated circuit, Bottleneck, [SPI.TRON]Engineering Sciences [physics]/Electronics, law.invention, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [SPI]Engineering Sciences [physics], 03 medical and health sciences, Printed circuit board, 0302 clinical medicine, law, Point (geometry), Wide band, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, business, ComputingMilieux_MISCELLANEOUS, 030217 neurology & neurosurgery
Abstract

International audience; The increasing complexity of electrical functions embedded in automotive and aeronautic applications increases the duration of the EMC qualification tests and the risk of nonconformity. The cost of certified means and skilled personnel for a normative test in radiated immunity are high and are often a bottleneck for the electronic suppliers. Any late-detected EMC non-compliance leads to an increased costs. To solve their problem, electronic suppliers need fast, economical and easy-to-use investigation tools. The Near Field Scan Immunity (NFSI) method developed for Integrated Circuits (IC) testing seems to be a good solution to perform quick investigation at Printed Circuit Board (PCB) level. Some specific probes must be designed and their capability to induce the same failures as during a far field test must be checked. This paper presents a methodology to achieve that point giving some examples of probe's validation.

Published
2019

42. Flight patterns for clouds exploration with a fleet of UAVs

Author

Gautier Hattenberger, Titouan Verdu, Simon Lacroix, Ecole Nationale de l'Aviation Civile (ENAC), Équipe Robotique et InteractionS (LAAS-RIS), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, ANR-17-CE01-0003,NEPHELAE,Réseaux pour l'étude de l'entrainement et la microphysique des nuages par l'exploration adaptative(2017), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
0209 industrial biotechnology, Data collection, 010504 meteorology & atmospheric sciences, Microphysics, business.industry, Computer science, Climate change, ComputerApplications_COMPUTERSINOTHERSYSTEMS, Cloud computing, 02 engineering and technology, 01 natural sciences, [SPI.AUTO]Engineering Sciences [physics]/Automatic, 020901 industrial engineering & automation, Cloud data, 13. Climate action, Remote sensing (archaeology), A priori and a posteriori, Relevance (information retrieval), business, 0105 earth and related environmental sciences, Remote sensing
Abstract

International audience; Modeling the cloud microphysics processes is essential to improve our understanding in climate changes and reduce the uncertainties in weather predictions. Aircrafts, remote sensing and ground-based infrastructures provide either sparse or coarse spatial measurements that are not sufficient to develop fine cloud models. UAVs have shown their ability to collect relevant cloud in-situ measures, and can be even more efficient when deployed in fleets. However, collecting relevant cloud data call for specific trajectories: this paper introduces a series of flight patterns dedicated to cloud exploration by a fleet of UAVs. The patterns definition comprise both a priori geometric information and real-time reactions to collected data. Results in simulated clouds assess their relevance for cloud in situ data collection.

Published
2019

43. Aging study of remote luminophore at ambient temperature

Author

Georges Zissis, Laurent Canale, Eko Purwanto, Ngapuli I. Sinisuka, Pascal Dupuis, LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Centre National de la Recherche Scientifique (CNRS), Lumière et Matière (LAPLACE-LM), and Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3)

Subjects
Materials science, Silicon, Composite number, chemistry.chemical_element, Phosphor, 02 engineering and technology, 01 natural sciences, law.invention, chemistry.chemical_compound, law, 0103 physical sciences, Thermal, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, ComputingMilieux_MISCELLANEOUS, Diode, 010302 applied physics, business.industry, [SPI.NRJ]Engineering Sciences [physics]/Electric power, 021001 nanoscience & nanotechnology, LED lamp, chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Luminophore, Degradation (geology), Optoelectronics, 0210 nano-technology, business
Abstract

Phosphor Convert White Light Emitting Diodes (pc-WLEDs) lamps market share is continuously growing since a few years, replacing traditional products due to their higher efficiency and expected lifetime. In Indonesia, the use of LED lamps increased sharply since the last four years, replacing CFL lamps. The most commonly found pc-WLEDs in the market are Blue-emitting LED coated with yellow phosphor based on silicon matrix. Many literature studies performed accelerated artificial aging of phosphor/silicon composite using oven and thermal plate. The consensus is to use a temperature of 85 °C. This study investigates medium term degradation failure mechanisms of phosphor/silicon material and found that such effect can be observed at ambient temperature. Different degradation modes were also identified.

Published
2019

44. Development Of Micro-Magnets For The Electromagnetic Transduction Of MEMS

Author

Daisuke Saya, Pierre Moritz, Lise-Marie Lacroix, Fabrice Mathieu, Guillaume Viau, David Bourrier, Liviu Nicu, Thomas Blon, Thierry Leichle, Klaus Hasselbach, Roman B. G. Kramer, Équipe Microsystèmes électromécaniques (LAAS-MEMS), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Service Instrumentation Conception Caractérisation (LAAS-I2C), Service Techniques et Équipements Appliqués à la Microélectronique (LAAS-TEAM), Laboratoire de physique et chimie des nano-objets (LPCNO), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC), Magnétisme et Supraconductivité (MagSup ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Circuits électroniques quantiques Alpes (QuantECA ), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Magnétisme et Supraconductivité (NEEL - MagSup), and Circuits électroniques quantiques Alpes (NEEL - QuantECA)

Subjects
Materials science, Microscope, 02 engineering and technology, 01 natural sciences, law.invention, [SPI]Engineering Sciences [physics], Condensed Matter::Materials Science, symbols.namesake, Hall effect, law, 0103 physical sciences, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, 010302 applied physics, Microelectromechanical systems, business.industry, Coercivity, 021001 nanoscience & nanotechnology, Computer Science::Other, Electromagnetic induction, Remanence, Magnet, symbols, Optoelectronics, 0210 nano-technology, business, Lorentz force
Abstract

International audience; This paper presents a new class of high-performance permanent micro-magnets based on the controlled assembly of cobalt nanorods for the electromagnetic transduction of MEMS. Micromagnets are fabricated using a low temperature fabrication process that yields a dense material exhibiting high coercive field and remanence to saturation magnetization ratio. The cartography of the magnetic induction produced by the sub-millimeter size magnets was obtained using a scanning Hall effect micro-probe microscope. Silicon microcantilevers placed in the vicinity of these magnets were successfully actuated using the Lorentz force with low currents. The good signal to noise ratio measured at resonance demonstrates the potentiality of these nanostructured micro-magnets.

Published
2019

45. Hyperspectral Imaging of Bio-Inspired Tilted Cholesteric Liquid Crystal Structures

Author

Aurélie Jullien, Michel Mitov, Umberto Bortolozzo, Stefania Residori, Adriana Scarangella, Université Côte d’Azur, CNRS, INPHYNI, Nice, France, Nano-Optique et Nanomatériaux pour l'optique (CEMES-NeO), Centre d'élaboration de matériaux et d'études structurales (CEMES), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Institut de Physique de Nice (INPHYNI), Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), 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), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Cholesteric liquid crystal, Physics::Optics, 02 engineering and technology, 01 natural sciences, Optics, Planar, Perpendicular, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], biology, business.industry, 010401 analytical chemistry, Bragg's law, 021001 nanoscience & nanotechnology, Polarization (waves), biology.organism_classification, Helicity, 0104 chemical sciences, Condensed Matter::Soft Condensed Matter, Wavelength, Chrysina gloriosa, 0210 nano-technology, business, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract

The cholesteric liquid crystal (CLC) phase exhibits a helical structure with a twist axis perpendicular to the local molecular director. When light propagates in the Bragg regime through a CLC slab with a planar texture, the medium gives rise to Bragg reflection, selective in wavelength and in polarization. The characteristics of the Bragg band are tunable by acting on the following structural parameters: the pitch, the helicity sense and the helix orientation. Tuning the latter parameter produces polygonal textures (Fig. 1, center). Such a texture is made of an array of micrometer-scale polygonal cells, acting a network of microlenses with wavelength-tunable focusing properties [1]. Polygonal textures can be found in biological CLCs (for instance, multiwavelength micromirrors the cuticle of scarab beetle Chrysina gloriosa [2]).

Published
2019

46. The Open EEGLAB portal

Author

Kenneth Yoshimoto, Subhashini Sivagnanam, Scott Makeig, Ramón Martínez-Cancino, Arnaud Delorme, Amitava Majumdar, Centre de recherche cerveau et cognition (CERCO), Institut des sciences du cerveau de Toulouse. (ISCT), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-CHU Toulouse [Toulouse]-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Swartz Center for Computational Neuroscience, University of California [San Diego] (UC San Diego), University of California-University of California, and San Diego Supercomputer Center [San Diego]

Subjects
Computer science, [INFO.INFO-SE]Computer Science [cs]/Software Engineering [cs.SE], Electroencephalography, computer.software_genre, 050105 experimental psychology, 03 medical and health sciences, EEGLAB, 0302 clinical medicine, Software, Human–computer interaction, medicine, 0501 psychology and cognitive sciences, medicine.diagnostic_test, business.industry, 05 social sciences, EEGLAB signal processing environment, Gateway (computer program), Pipeline (software), Parallel processing (DSP implementation), Scripting language, Proof of concept, Neuroimaging software, Neuroscience Gateway, Electroencephalographic signals, [INFO.INFO-BI]Computer Science [cs]/Bioinformatics [q-bio.QM], business, computer, 030217 neurology & neurosurgery
Abstract

International audience; The EEGLAB signal processing environment is a widely used open source software environment for processing electroencephalographic (EEG) data. The Neuroscience Gateway (nsgportal.org) is a software portal allowing users to readily run a variety of neuroimaging software on high performance computing (HPC) resources. We have expanded the current Neuroscience Gateway (NSG) services to enable researchers to freely run EEGLAB processing scripts and pipelines on their EEG or related data via the Neuroscience Gateway. This Open EEGLAB Portal is open to all for use in nonprofit projects and allows researchers to submit unimodal or multimodal EEG data for parallel processing using standard or custom EEGLAB processing pipelines. A detailed user tutorial is available (sccn.ucsd.edu/wiki/EEGLAB_on_NSG). As a proof of concept, we apply an EEGLAB pipeline to freely available 128-channel EEG data from 1,097 participants in the Child Mind Institute Healthy Brain Network project (childmind.org/center/healthy-brain-network).

Published
2019

47. OpenFlow based Topology Discovery Service in Software Defined Vehicular Networks: limitations and future approaches

Author

Thierry Villemur, Slim Abdellatif, Philippe Owezarski, Soufian Toufga, Équipe Services et Architectures pour Réseaux Avancés (LAAS-SARA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
Service (systems architecture), OpenFlow, Vehicular ad hoc network, Topology discovery service, Computer science, business.industry, 020206 networking & telecommunications, Topology (electrical circuits), 02 engineering and technology, Network topology, Topology, Software Defined Vehicular Network, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Software, Scalability, 0202 electrical engineering, electronic engineering, information engineering, Overhead (computing), 020201 artificial intelligence & image processing, OFDP, business
Abstract

International audience; This paper presents our ongoing work towards the definition of an effective topology discovery service for SDN based hybrid vehicular networks. The main contributions of this paper are threefold: (1) an analysis of the main limitations of the "de facto" topology discovery service when applied to vehicular networks; (2) a quantitative assessment of its traffic overhead and the required computing resources at the controller to show the scalability issues that it raises; and (3) an insight into our design principles for an effective topology discovery service for SDN-based hybrid vehicular networks.

Published
2018

48. Frequency Selection Approach for Energy Aware Cloud Database

Author

Jie Song, Hui Liu, Jean-Marc Pierson, Chaopeng Guo, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Northeastern University (CHINA), Système d’exploitation, systèmes répartis, de l’intergiciel à l’architecture (IRIT-SEPIA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, and Northeastern University [Shenyang]

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Optimization, General Computer Science, Computer science, 020209 energy, Distributed computing, Monte Carlo tree search, Big data, Système d'exploitation, Réseaux et télécommunications, Cloud computing, 02 engineering and technology, 7. Clean energy, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Dynamic voltage and frequency scaling, Architectures Matérielles, Genetic algorithm, 0202 electrical engineering, electronic engineering, information engineering, Cloud database, General Materials Science, Frequency scaling, Cloud database system, business.industry, Frequency selection, General Engineering, Provisioning, Systèmes embarqués, Energy efficiency, Scalability, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, 020201 artificial intelligence & image processing, lcsh:Electrical engineering. Electronics. Nuclear engineering, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business, lcsh:TK1-9971, Efficient energy use
Abstract

A lot of cloud systems are adopted in industry and academia to face the explosion of the data volume and the arrival of the big data era. Meanwhile, energy efficiency and energy saving become major concerns for data centers where massive cloud systems are deployed. However, energy waste is quite common due to resource provisioning. In this paper, using dynamic voltage and frequency scaling (DVFS), a frequency selection approach is introduced to improve the energy efficiency of the cloud systems in terms of resource provisioning. In the approach, two algorithms, genetic algorithm (GA) and Monte Carlo tree search algorithm (MCTS), are proposed. A cloud database system is taken as an example to evaluate the approach. The results of the experiments show that both algorithms have its advantages. The algorithms have great scalability, in which the GA can be applied to thousands of nodes and the MCTS can be applied to hundreds of nodes. Both algorithms have high accuracy compared with optimal solutions (up to 99.9% and 99.6% for GA and MCTS, respectively). According to an optimality bound analysis, 26% of energy can be saved at most using our frequency selection approach.

Published
2018

49. Towards information modeling for a QoS-aware support in the lifecycle of virtual networks

Author

Noëmie Simoni, Gladys Diaz, Michelle Sibilla, Réseaux, Mobilité et Services (RMS), Laboratoire Traitement et Communication de l'Information (LTCI), Institut Mines-Télécom [Paris] (IMT)-Télécom Paris-Institut Mines-Télécom [Paris] (IMT)-Télécom Paris, Département Informatique et Réseaux (INFRES), Télécom ParisTech, HAL, TelecomParis, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Télécom Paris (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Université Paris 13 (FRANCE), Laboratoire de Traitement et Transport de l'Information (L2TI), Institut Galilée-Université Paris 13 (UP13)-Université Sorbonne Paris Cité (USPC), Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Institut National Polytechnique de Toulouse - INPT (FRANCE), and Telecom ParisTech (FRANCE)

Subjects
Service (systems architecture), Computer science, Distributed computing, Réseaux et télécommunications, 02 engineering and technology, [INFO] Computer Science [cs], computer.software_genre, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], 020204 information systems, 0202 electrical engineering, electronic engineering, information engineering, Profiling (information science), [INFO]Computer Science [cs], Virtual network, ComputingMilieux_MISCELLANEOUS, QoS modeling, business.industry, Quality of service, Virtual network service, 020206 networking & telecommunications, Virtualization, Automation, Information model, Key (cryptography), business, computer
Abstract

International audience; Information network modeling is nowadays a popular area of research. Especially, the introduction of virtualization technologies is changing the lifecycle of systems. Virtualization techniques allow distinguishing different levels: applications, networks, and equipment. The design of new virtual networks must consider the requirements of all these levels in a complementary fashion. Quality of Service (QoS) is still the one of the main key feature to be integrated. In this paper, we focus on the virtualized environments where we define a generic concept, called the VirtualElement. Indeed, we are interested in the representation of information enabling the automation of deployment, monitoring and management tasks for virtual networks. For this purpose we characterize the VirtualElement by constrains representing its functional and non-functional behavior. We apply our model at different phases of lifecycle of virtual networks by defining the service profiling. We propose a translation of the virtual network into an OVF file.

Published
2018

50. SAAC: Secure Android Application Context a Runtime Based Policy and its Architecture

Author

Eric Alata, Mohamad Kaaniche, Yuxiao Mao, Guillaume Averlant, Vincent Nicomette, Équipe Tolérance aux fautes et Sûreté de Fonctionnement informatique (LAAS-TSF), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), and Université de Toulouse (UT)

Subjects
021110 strategic, defence & security studies, Context-aware, business.industry, Computer science, media_common.quotation_subject, 0211 other engineering and technologies, 020206 networking & telecommunications, Access control, 02 engineering and technology, Enterprise information security architecture, Payment, [INFO.INFO-CR]Computer Science [cs]/Cryptography and Security [cs.CR], Android, Privacy, Architecture, Security, 0202 electrical engineering, electronic engineering, information engineering, Android application, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Android (operating system), Software engineering, business, media_common
Abstract

International audience; A smartphone runtime environment consists of multiple entities with different goals and scope. Indeed, critical applications such as banking applications that make contactless payments, share the same environment with other applications of varying levels of trust. This paper presents a novel approach allowing a standard Android user to launch its applications in a configurable secure execution context. The security rules defined for each application are enforced by a dedicated security architecture implemented in several parts of the Android ecosystem. A performance assessment of the solution is also provided.

Published
2018

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