School of Engineering of Innovation, Energy and Advanced Technologies
Ivry-sur-Seine, France
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Coutin L.,University Paul Sabatier | Marie N.,Paris West University Nanterre La Défense | Marie N.,School of Engineering of Innovation, Energy and Advanced Technologies
Stochastic Processes and their Applications | Year: 2016

In 1990, in Itô's stochastic calculus framework, Aubin and Da Prato established a necessary and sufficient condition of invariance of a nonempty compact or convex subset C of Rd (d∈N*) for stochastic differential equations (SDE) driven by a Brownian motion. In Lyons rough paths framework, this paper deals with an extension of Aubin and Da Prato's results to rough differential equations. A comparison theorem is provided, and the special case of differential equations driven by a fractional Brownian motion is detailed. © 2016 Elsevier B.V.

Li W.,University Paris - Sud | Bassi F.,University Paris - Sud | Bassi F.,School of Engineering of Innovation, Energy and Advanced Technologies | Galluccio L.,University of Catania | And 2 more authors.
Automatica | Year: 2017

Consider a multi-agent system where agents perform a given task with different levels of ability. Agents are initially not aware of how well they perform in comparison with their peers, and are willing to self-assess. This scenario is relevant, e.g., in wireless sensor networks, or in crowdsensing applications, where devices with embedded sensing capabilities collaboratively collect data to characterize the environment: the global performance is very sensitive to the measurement accuracy, and agents providing outliers should restrain to participate. This paper presents a distributed algorithm enabling each agent to self-assess its own ability. The algorithm tracks the outcomes of a local comparison test performed by pairs of agents when they randomly meet, and able to gauge their relative level of ability. The dynamics of the proportions of agents with similar assessments are described using continuous-time state equations. The existence of an equilibrium is shown. Closed-form expressions for the various proportions of agents with similar assessments are provided at equilibrium. In simulations, a community of agents equipped with sensors, and trying to determine the performance of their equipment is considered. Simulation results show a good fitting with theoretical predictions. © 2017 Elsevier Ltd

Moungla H.,University of Paris Descartes | Touati N.,School of Engineering of Innovation, Energy and Advanced Technologies | Mehaoua A.,University of Paris Descartes | Mehaoua A.,Pohang University of Science and Technology
2012 IEEE 14th International Conference on e-Health Networking, Applications and Services, Healthcom 2012 | Year: 2012

WBSNs (wireless body sensor network) like any other sensor networks suffers limited energy and are the highly distributed network, in which its nodes are the organizer itself and each of them has the flexibility of collecting and transmitting patient biomedical information to a sink. When knowledge sent to sink from a path that doesn't have a definite basis, the routing is a crucial challenge in Wireless Body Area Sensor Networks, additionally reliability and routing delay are the considerable factors in these type of networks. Most of the attention should be given to the energy routing where energy awareness is an essential consideration in WBSNs and the frequent topology change increases the dynamics of network topology, and complicates the process of relay selection in cooperative communications. In this paper, we propose a Min-Max multi-commodity flow model for WBSNs which allows to prevent sensor node saturation and take best action against reliability and the path loss, by imposing an equilibrium use of sensors during the routing process. Simulation results show that the algorithm balances the energy consumption of nodes effectively and maximize the network lifetime. It will meet the enhanced WBSNs requirements, including better delivery ratio, less reliable routing overhead. © 2012 IEEE.

Villette V.,University of Paris Descartes | Poindessous-Jazat F.,University of Paris Descartes | Bellessort B.,University of Paris Descartes | Roullot E.,School of Engineering of Innovation, Energy and Advanced Technologies | And 4 more authors.
Neurobiology of Aging | Year: 2012

In Alzheimer's disease, amyloid beta peptide (Aβ) accumulation is associated with hippocampal network dysfunction. Intrahippocampal injections of Aβ induce aberrant inhibitory septohippocampal (SH) network activity in vivo and impairment of memory processing. In the present study, we observed, after hippocampal Aβ treatment, a selective loss of neurons projecting to the medial septum (MS) and containing calbindin (CB) and/or somatostatin (SOM). Other GABAergic neuronal subpopulations were not altered. Thus, the present study identifies hippocamposeptal neuron populations as specific targets for Aβ deposits. We observed that in Aβ-treated rats but not in controls, glutamate agonist application induced rhythmic bursting in 55% of the slow-firing neurons in the medial septum. This suggests that hippocampal Aβ can trigger modifications of the septohippocampal pathway via the alteration of a specific neuronal population. Long-range hippocamposeptal GABA/calbindin neurons, targets of hippocampal amyloid deposits, are implicated in supporting network synchronization. By identifying this target, we contribute to the understanding of the mechanisms underlying deleterious effects of Aβ, one of the main agents of dementia in Alzheimer's disease. © 2012 Elsevier Inc.

Le Martret C.J.,Thales Alenia | Le Duc A.,School of Engineering of Innovation, Energy and Advanced Technologies | Marcille S.,Telecom ParisTech | Ciblat P.,Telecom ParisTech
IEEE Transactions on Communications | Year: 2012

In this paper we derive performance metrics closed-form expresions of retransmission schemes such as Automatic Repeat reQuest (ARQ) and Hybrid ARQ (HARQ) in the case of memoryless block fading channels. As performance metrics, we consider the Packet Error Rate (PER), the efficiency, and the packet delay. The novelty of the paper is twofold: i) the metrics are considered at the Network level; ii) we introduce a new general framework which enables us to derive analytically the considered performance metrics for most retransmission schemes, including recent cross-layer strategies with the Network layer. The metrics at the Medium Access Control (MAC) level are obtained as a byproduct. Among the considered retransmission schemes, we especially consider the Incremental Redundancy HARQ scheme with different lengths redundancy packets. © 2012 IEEE.

Lehiani Y.,Artemis | Preda M.,Artemis | Maidi M.,School of Engineering of Innovation, Energy and Advanced Technologies | Ghorbel F.,Manouba University
IEEE 2015 International Conference on Signal and Image Processing Applications, ICSIPA 2015 - Proceedings | Year: 2015

This paper presents a novel approach for object identification and steady tracking in mobile augmented reality applications. First, the system identifies the object of interest using the KAZE algorithm. Then, the target tracking is enabled with the optical flow throughout the camera instant video stream. Further, the camera pose is determined by estimating the key transformation relating the camera reference frame according to the world coordinate system. Therefore, the visual perception is augmented with 3D virtual graphics overlaid on target object within the scene images. Finally, experiments are conducted to evaluate the system performances in terms of accuracy, robustness and computational efficiency as well. © 2015 IEEE.

Li W.,University Paris - Sud | Bassi F.,School of Engineering of Innovation, Energy and Advanced Technologies | Kieffer M.,University Paris - Sud
IEEE International Symposium on Information Theory - Proceedings | Year: 2016

This paper addresses the information theoretical analysis of data compression achieved by random linear network coding in wireless sensor networks. A sparse network coding matrix is considered with columns having possibly different sparsity factors. For stationary and ergodic sources, necessary and sufficient conditions are provided on the number of required measurements to achieve asymptotically vanishing reconstruction error. To ensure the asymptotically optimal compression ratio, the sparsity factor can be arbitrary close to zero in absence of additive noise. In presence of noise, a sufficient condition on the sparsity of the coding matrix is also proposed. © 2016 IEEE.

Rioual M.,Électricité de France | Bernin B.,School of Engineering of Innovation, Energy and Advanced Technologies
IEEE Power and Energy Society General Meeting | Year: 2013

This document describes the modelling of the 400 kV up-stream network for the energization of a 340 MVA transformer, using a Thevenin equivalent and also its detailed representation; after the validation of the complete network under steady-state conditions, a comparison between measurements made on site and transient simulations have also been performed, giving very satisfactory results, especially when a detailed modelling of the network is considered, as the transformer considered is highly non linear; non linear aspects are discussed. © 2013 IEEE.

Rioual M.,Électricité de France | Digard H.,Électricité de France | Martin C.,School of Engineering of Innovation, Energy and Advanced Technologies
IEEE Power and Energy Society General Meeting | Year: 2013

This document describes the methodology developed for the simulation of phenomena observed when energizing and de-energizing a 250 MVA step-up transformer of a pumped storage power plant connected to the 400 kV network. © 2013 IEEE.

Bareggi A.,School of Engineering of Innovation, Energy and Advanced Technologies | O'Donnell G.E.,Trinity College Dublin
Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture | Year: 2015

Changing environmental awareness has led manufacturing industry to give critical consideration to the use of conventional coolants and traditional cooling techniques in machining processes. This research shows that impinging gas jets have a much greater potential for reducing the temperature in cutting operations than previously suspected. In this work, the mechanical effect produced by a high-speed air jet impinging on the cutting area at different directions and pressures was critically investigated. Experimental tests with different pressures and nozzle directions indicate that the mechanical effect of the air jet contributes significantly to the reduction in cutting temperature. The tests were carried out on AISI 1020 workpiece and the temperature was measured by a K-type thermocouple embedded in the WC insert. Better performance in terms of cooling is shown when the air jet is directed onto the top face of the chip. The air jet impinging on the surface of the workpiece in the contact zone, on the tool and on the chip introduces both thermal and mechanical effects. Heretofore, these influences have not been examined together. Finite element analysis shows that the mechanical effect of the air jet, impinging on the chip, causes an alteration of the state of stress on the rake face. A theoretical explanation based on this observation is proposed, and the results of experimental, finite elements and analytical modeling are compared. © IMechE 2014.

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