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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. Source


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. Source


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

This paper presents a novel approach for object recognition in extended image databases using a mobile client-server architecture. The proposed approach relies upon feature detection and description to characterize textured objects within the image. The similarity search is performed on descriptor arrays by computing the distance between the query descriptor compared with reference descriptors extracted offline. The key contributions of the approach are the high accuracy, the time-effectiveness and the scalability of the method towards large image datasets. The developed method is first, integrated on a mobile platform and, then, deployed on a client-server architecture to deal with high volume image galleries. Experiments are performed to evaluate the performances of the system in real-life environment conditions and the obtained results demonstrate the relevance of the proposed approach. © 2015 IEEE. Source


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. Source


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. Source

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