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Adaptive Control for a Class of Uncertain Nonlinear Systems : Application to PhotovoltaÏc Control Systems
No full textInternational audienceIn this technical note, an adaptive control framework for compensation of uncertainties and perturbations that satisfy the matching condition on a class of nonlinear dynamic systems is presented. The proposed method does not need the explicit knowledge of the bound values on the uncertainties, and the resulting compensatory term is continuous. The application of this formulation for maximum power point tracking and unity power factor on grid-connected photovoltaic systems is presented
LTPS-TFT with embedded PbS quantum dots as near-infrared photodetector: Using an hybrid technology to improve the detection performance in an easy process
No full textInternational audienc
Waves and rays in plano-concave laser cavities, part I. Geometric modes in the paraxial approximation
No full textInternational audienc
Formally Verifying Flow Properties in Industrial Systems
No full textInternational audienceIn contrast to other IT systems, industrial systems often do not only require classical properties like data confidentiality or authentication of the communication, but have special needs due to their interaction with physical world. For example, the reordering or deletion of some commands sent to a machine can cause the system to enter an unsafe state with potentially catastrophic effects. To prevent such attacks, the integrity of the message flow is necessary. We provide a formal definition of Flow Integrity. We apply our framework to two well-known industrial protocols: OPC-UA and MODBUS. Using TAMARIN, a cryptographic protocol verification tool, we confirm that most of the secure modes of these protocols ensure Flow Integrity given a resilient network. However, we also identify a weakness in a supposedly secure version of MODBUS
A Simple Guideline for Code Optimizations on Modern Architectures with OpenACC and CUDA
No full textInternational audienceLearn a simple strategy guideline to optimize applications runtime. The strategy is based on four steps and illustrated on a two-dimensional Discontinuous Galerkin solver for computational fluid dynamics on structured meshes. Starting from a CPU sequential code, we guide the audience through the different steps that allowed us to increase performances on a GPU around 149 times the original runtime of the code (performances evaluated on a K20Xm). The same optimization strategy is applied to the CPU code and increases performances around 35 times the original run time (performances evaluated on a E5-1650v3 processor). Finally, different hardware architectures (Xeon CPUs, GPUs, KNL) are benchmarked with the native CUDA implementation and one based on OpenACC
A Study of Virtual Visual Servoing Sensitivity in the Context of Image/GIS Registration for Urban Environments
No full textInternational audienceThis paper studies the sensitivity of pose estima- tion to the 2D measure noise when using virtual visual servoing. Attempting to apply virtual visual servoing to image/Geographic Information System (GIS) reg- istration, the robustness to the noise in images is an important factor to the accuracy of estimation. To an- alyze the impact of different levels of noise, a series of image/GIS registration tests based on synthetic in- put image are studied. Also, RANSAC is introduced to improve the robustness of the method. We also com- pare some different strategies in choosing geometrical features and in the treatment of projection error vec- tor in virtual visual servoing, providing a guide for parametrization
Un cadre conceptuel pour concevoir le système de mobilité urbaine
No full textInternational audienceUrban mobility poses some challenges for design practice. Mobility components such as vehicles, urban infrastructure, mobility services or other services delivered along a mobility experience are often designed separately. The performance of a global urban mobility system, at a city scale for instance, is therefore parceled out into components’ ones that are not integrated from the perspective of a user who interacts with them in a door-to-door journey. This paper starts with relating different perspectives of urban mobility including, in crescendo, the human in the production of a global design solution. Through the examination of design and transport literature as well as practical examples, the paper highlights complexity factors of urban mobility that challenges engineering design. A second contribution is to identify relevant design objects aiming at providing a language for designing urban mobility which are mobility components, travel scenarios, and traveler centered indicators.La mobilité urbaine pose certains défis à la pratique de la conception. Les composantes de mobilité telles que les véhicules, l'infrastructure urbaine, ou les services qui sont fournis dans le cadre d'une expérience de mobilité sont souvent conçus séparément. La performance globale d'un système de mobilité urbaine, par exemple à l'échelle de la ville, est par conséquent morcelée en plusieurs performances par composante. Ces dernières ne sont pas intégrées dans la perspective d'un utilisateur en interaction avec le tout, dans une mobilité porte à porte. Cet article relie tout d'abord différentes perspectives de mobilité urbaine en incluant, crescendo, l'humain dans la production d'une solution globale de conception. À travers l'examen de la littérature en conception et en transport ainsi que par des exemples pratiques, l'article souligne les facteurs de complexité de la mobilité urbaine qui modifient les frontières de l'ingénierie de la conception. La principale contribution est d'identifier trois types d'objets de conception pertinents, visant à fournir un langage pour concevoir des systèmes de mobilité urbaine : composantes de la mobilité, l'expérience du voyageur et indicateurs axés sur les déplacements
Effect of the incident power on permittivity, losses and tunability of BaSrTiO<sub>3</sub> thin films in the microwave frequency range
No full textInternational audienceDomain wall motions in ferroelectrics participate to the material's complex permittiv-ity and are responsible for their sensitivity of the dielectric properties to the driving electric field and thus to the incident power at microwave frequencies. In the present study, the dependence of the permittivity, the dielectric losses and the tunability of Ba2/3 Sr1/3TiO3 (BST) thin films on the incident power and on the bias fields is examined at a frequency of 500 MHz. While, the domain wall motion participates only slightly to the permittivity (< 5 %), it strongly influences the losses due to its very dissipative behavior. As a consequence, the Figure of Merit (FoM , ratio between tunability and dielectric losses) of the material depends on the applied microwave power. In the present study, a decrease of the FoM from 29 to 21 is observed for an incident power varying from −20 dBm to 5 dBm. When characterizing ferroelectric materials, the incident power has to be considered; moreover, domain wall motion effects should be limited in order to achieve a high FoM and less power sensitivity
Electrical circuit for starting e.g. laser flashlamp, of electric optical pumping system that is utilized in ancillary medical field for depilation treatment, has terminals arranged in series between capacitor and secondary windingInventeur: Eric Berthelot Demandeur: CNRS Informations sur la publication: FR2970838 (A1) 2012-07-27 Date de priorité: 2011-01-26
No full textThe Lovász Hinge: A Novel Convex Surrogate for Submodular Losses
No full textLearning with non-modular losses is an important problem when sets of predictions are made simultaneously. The main tools for constructing convex surrogate loss functions for set prediction are margin rescaling and slack rescaling. In this work, we show that these strategies lead to tight convex surrogates iff the underlying loss function is increasing in the number of incorrect predictions. However, gradient or cutting-plane computation for these functions is NP-hard for non-supermodular loss functions. We propose instead a novel surrogate loss function for submodular losses, the Lovász hinge, which leads to O(p log p) complexity with O(p) oracle accesses to the loss function to compute a gradient or cutting-plane. We prove that the Lovász hinge is convex and yields an extension. As a result, we have developed the first tractable convex surrogates in the literature for submodular losses. We demonstrate the utility of this novel convex surrogate through several set prediction tasks, including on the PASCAL VOC and Microsoft COCO datasets