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Shi X.,CGCL | Pazat J.-L.,INSA Rennes | Rodriguez E.,CEDRAT | Jin H.,CGCL | Jiang H.,Huazhong University of Science and Technology
Future Generation Computer Systems | Year: 2010

Grid applications have been prone to encountering problems such as failures or malicious attacks during execution in recent years, due to their distributed and large-scale features. The application itself, however, has limited power to address these problems. This paper presents the design, implementation, and evaluation of an adaptive framework- Dynasa, which strives to handle security problems using adaptive fault-tolerance (i.e., checkpointing and replication) during the execution of applications according to the status of the Grid environments. We evaluate our adaptive framework experimentally using the Grid5000 testbed and the experimental results have demonstrated that Dynasa enables the application itself to handle the security problems efficiently. The starting of the adaptive component is less than 1 s and the adaptive action is less than 0.1 s with the checkpoint interval of 20 s. Compared with non-adaptive method, experimental results demonstrate that Dynasa achieves better performance in terms of execution time, network bandwidth consumed, and CPU load, resulting in up to a 50% lower overhead. © 2009 Elsevier B.V. All rights reserved.


Dupuy D.,CEDRAT | Pedreira D.,CEDRAT | Verbeke D.,CEDRAT | Leconte V.,CEDRAT | And 4 more authors.
IEEE Transactions on Magnetics | Year: 2016

In order to address their considerable impacts on both the energy efficiency and performance requirements, eddy current modeling and its accuracy are discussed from a thermodynamic approach. An energy-based error criterion for automatic mesh adaption is developed. Coupled with a remeshing strategy that preserves mesh quality, some numerical results are given on an induction machine. © 1965-2012 IEEE.


Amestoy P.,CNRS Toulouse Institute in Information Technology | Buttari A.,CNRS Toulouse Institute in Information Technology | Joslin G.,European Center for Research and Advanced Training in Scientific Computation | L'Excellent J.-Y.,Institute National Of Recherche En Informatique Et En Automatique | And 7 more authors.
IEEE Transactions on Magnetics | Year: 2014

In this paper, the performance of a parallel sparse direct solver on a shared-memory multicore system is presented. Large size test matrices arising from finite element simulation of induction heating industrial applications are used to evaluate the performance improvements due to low-rank representations and multicore parallelization. © 2014 IEEE.


Rondot L.,CEDRAT | Rodriguez E.,CEDRAT | Mazauric V.,Schneider Electric | Guerin C.,CEDRAT
Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation, CEFC 2010 | Year: 2010

Electric vector potential formulations are very convenient for 3D-problems. For transients, the weak formulation directly obtained from the Maxwell's equations provides a non-symmetric coupled system, leading to huge memory storage, an ill-conditioned matrix and subsequently a longer resolution. It is argued that Galilean invariance of the stationary condition derived from the magnetodynamic functional provides a deep justification for a symmetric system. Preliminary computations are given. © 2010 IEEE.


Dupuy D.,CEDRAT | Pedreira D.,CEDRAT | Verbeke D.,CEDRAT | Leconte V.,CEDRAT | And 3 more authors.
IEEE Transactions on Magnetics | Year: 2015

In order to address their considerable impacts on both energy efficiency and performance requirements, eddy currents modeling and its accuracy are discussed from a thermodynamic approach. A dedicated error criterion is first described in a general framework, i.e., without any assumption about the potential formulation, including possible body motion, and independent from the dimension of the problem. After implementation, preliminary validation is given on an induction heating problem and an induction machine. As expected, the thermodynamic functional provides the global convergence of the calculation within an iterative procedure, whereas the conservation of the electromagnetic power is assessed locally to highlight the ill-checked elements. © 1965-2012 IEEE.


Rondot L.,CEDRAT | Mazauric V.G.,Schneider Electric | Wendling P.F.,Magsoft Corporation
IEEE Transactions on Magnetics | Year: 2010

In order to improve the finite element modeling of macroscopic eddy currents, a quadratic energy-based error criterion is obtained from a thermodynamic description of electromagnetism. Attention is first paid on the analytical derivation of the criterion in a general sense-i.e. without any assumption about the potential formulation and including possible body motion-especially to validate its relevance in 2D or 3D and to stress its independence from the formulation or the kind of application. Preliminary validation is given on a Thomson's effect device: As expected, the state functions provide the global convergence of the calculation within an iterative procedure whereas the conservation of the electromagnetic power is assessed locally to highlight the ill-checked elements. © 2006 IEEE.


Rondot L.,CEDRAT | Mazauric V.,Schneider Electric | Ladas D.,Schneider Electric
International Journal of Applied Electromagnetics and Mechanics | Year: 2010

In order to improve the finite element modeling of macroscopic eddy currents, a quadratic energy-based error criterion is derived from a thermodynamic description of electromagnetism. While the conservation of the electromagnetic power is assessed locally to highlight the ill-checked elements, the state functions provide the global convergence of the calculation within an adaptative procedure. The criterion is shown: suitable for 2D and 3D, independent of the formulation, supporting the body motion. A validation is given on a Thomson's effect device. © 2010 - IOS Press and the authors. All rights reserved.


Meunier G.,CNRS Grenoble Electrical Engineering Lab | Charmoille V.,CNRS Grenoble Electrical Engineering Lab | Guerin C.,Cedrat | Labie P.,CNRS Grenoble Electrical Engineering Lab | Marechal Y.,CNRS Grenoble Electrical Engineering Lab
IEEE Transactions on Magnetics | Year: 2010

This paper proposes a general finite element approach for the frequency-domain homogenization of electromagnetic periodical structures. Based on local finite element resolutions on a cell, the method allows taking into account the local effects at the macroscopic level through the determination of equivalent macroscopic permeability and conductivity laws. Examples of the modeling of eddy current losses in windings are presented. © 2006 IEEE.


Ennassiri H.,University of Le Havre | Dhifli M.,University of Le Havre | Chabour F.,University of Le Havre | Barakat G.,University of Le Havre | And 2 more authors.
2016 11th International Conference on Ecological Vehicles and Renewable Energies, EVER 2016 | Year: 2016

The aim of this paper is to compare two approaches for modelling the vibro-acoustic behaviour of a three-phase discoïdal switching flux permanent-magnet machine (DSFPM) due to electromagnetic origins. The first approach is based on a full transient vibro-acoustic analysis of the DSFPM emitted acoustic noise. The second modelling approach is based on a modal superposition analysis of the DSFPM vibro-acoustic behaviour. This multi-physic study is based on a weak coupling between two 3D Finite-Element (FE) models: an electromagnetic model computing the magnetic pressure and a vibroacoustic model to quantify the vibration/noise performances. Results comparison between the two modelling approaches shows the effectiveness of the modal superposition model in terms of precision and computation time. © 2016 IEEE.


CEDRAT TECHNOLOGIES is unveiling its linear Moving Iron Controllable Actuator (MICA) product line onto the market, with associated drive electronics, in response to requirements in the industrial sector for highly reliable, long-life solutions.

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