Éditeur(s) : HAL CCSD
Résumé : National audience
Actes du 20ième colloque du GRETSI (2005)
Louvain-la-Neuve, Belgium

hal-00605242
https://hal.archives-ouvertes.fr/hal-00605242

Éditeur(s) : HAL CCSD
Résumé : National audience
2e Congrès National de la SMAI
Evian-les-bains, France

hal-00770283
https://hal.univ-antilles.fr/hal-00770283

Éditeur(s) : HAL CCSD
Résumé : International audience
Proceedings - 26th IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2012
Fukuoka, Japan

hal-00755765
https://hal.archives-ouvertes.fr/hal-00755765

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
ISSN: 0377-0427

hal-00530820
https://hal.archives-ouvertes.fr/hal-00530820
DOI : 10.1016/j.cam.2008.08.014

Éditeur(s) : HAL CCSD
Résumé : International audience
ICGF'2000, the International Conference on Generalized Functions, Linear and nonlinear problems
Pointe-à-pitre, Guadeloupe

hal-01555297
https://hal.archives-ouvertes.fr/hal-01555297

Éditeur(s) : HAL CCSD
Résumé : International audience
International Meeting on Grid and Parallel Computing
Beyrouth, Lebanon

hal-00770281
https://hal.univ-antilles.fr/hal-00770281

Éditeur(s) : HAL CCSD Institute for Scientific Computing and Information
Résumé : International audience
In this paper, we solve a problem describing the mechanical deformations of a porous medium in the presence of a monophasic linear flow or a two phase nonlinear flow with the purpose of modelizing subsidence of hydrocarbon reservoirs. An essential characteristics of this problem is that the mechanical deformation and the flow have different time scales. In petroleum industry, one uses different very efficient simulators for the flow problem and the mechanical deformations, which enables to handle complex models. Therefore it is necessary to be able to combine as efficiently as possible the exploitation of these simulators. We propose two alternative splitting approaches. The first one is the staggered algorithm used by engineers, which amounts to a Gauss-Seidel method in the one phase linear case. The second approach is based upon the preconditioned conjugate gradient method. We use a numerical multi-scale method in both of these algorithms. We compare these two approaches and we show that the preconditioned conjugate gradient algorithm is faster and more robust than the staggered algorithm. Applying the preconditioned conjugate gradient algorithm therefore seems to compensate for the fact that the inf-sup condition for the mixed discretization method is not satisfied when combining the simulators for the mechanical deformations and for the flow computations.
ISSN: 1705-5105

Droits : http://creativecommons.org/licenses/by/
hal-01449039
https://hal.archives-ouvertes.fr/hal-01449039
https://hal.archives-ouvertes.fr/hal-01449039/document
https://hal.archives-ouvertes.fr/hal-01449039/file/DHLE.pdf

Éditeur(s) : HAL CCSD
Résumé : International audience
Proceedings of 2004 IEEE International Conference on Fuzzy Systems

hal-00605239
https://hal.archives-ouvertes.fr/hal-00605239

Éditeur(s) : HAL CCSD Institute for Scientific Computing and Information
Résumé : International audience
The production of oil in soft highly compacted reservoirs produces a significant reduction in the pore space which in turn causes the surface to subside. The authors couple two simulators to model the mechanical deformations in the presence of a Darcy flow, both one- and two-phase. The simulators solve for flow in a porous medium using a finite volume method, and solve for the mechanical deformation of the porous media using a finite element method. The flow equations and the deformation equations are coupled using Biot's law. The authors use two different methods for the coupling: the first uses a staggered algorithm; the second is based on a preconditioned conjugate method. The authors use a multiscale method in both approaches. The authors show that the inf-sup condition is not satisfied, because of the mixed discretization which is done by using two separate simulators. The authors give convergence comparisons for the two methods for several examples. Two of the examples are for the linear problem (one-phase) where they know the exact solution and one is for the nonlinear problem (two-phase). In all cases, the preconditioned conjugate algorithm is faster and more robust, in particular when the inf-sup condition is not satisfied. In the nonlinear problem the authors state that the results agree with physical predictions but do not give actual empirical data. Finally, they show the effects of grid orientation on the nonlinear problem.
ISSN: 1705-5105

hal-00730673
https://hal.archives-ouvertes.fr/hal-00730673

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
ISSN: 0950-7051

hal-00604031
https://hal.archives-ouvertes.fr/hal-00604031

Éditeur(s) : HAL CCSD springer
Résumé : International audience
Lecture notes in computer science

hal-00530822
https://hal.archives-ouvertes.fr/hal-00530822

Éditeur(s) : HAL CCSD InTech
Applied Biological Engineering - Principles and Practice

ISBN : 978-953-51-0412-4
hal-00683825
https://hal.archives-ouvertes.fr/hal-00683825

Éditeur(s) : HAL CCSD
Résumé : International audience
CMAIA 2006, a Conference on Mathematics and its Applications
St Augustine, Trinidad and Tobago

hal-00770273
https://hal.univ-antilles.fr/hal-00770273

Éditeur(s) : HAL CCSD
Résumé : International audience
In this paper, we use a segmentation method applied to the plants images analysis. The segmentation gives groups of pixels, and we propose to use merging operators to address the most relevant groups in order to improve the recognitions systems performance. In particular, we use an operator called Pi fully reinforced. The experiments carried out show that the use of Pi improves outcomes for structuring groups of pixels.
Advanced Information Networking and Applications
Fukuoka, Japan

hal-00652125
https://hal.archives-ouvertes.fr/hal-00652125
DOI : 10.1109/WAINA.2012.40

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
In a previous work, one of the authors has studied a numerical treatment (by fully implicit discretizations) of a two-dimensional Navier-Stokes-like problem and has proved existence and convergence results for the resulting discretized systems with homogeneous Dirichlet boundary conditions. In this work, we propose some new preconditioned multilevel versions of inexact-Newton algorithms to solve these equations. We also develop another multilevel preconditioner for a nonlinear GMRES algorithm. All of the preconditioners are based on incremental unknowns formulations.
ISSN: 0096-3003

hal-00770269
https://hal.univ-antilles.fr/hal-00770269
DOI : 10.1016/S0096-3003(96)00304-9

Éditeur(s) : HAL CCSD
Résumé : International audience
Proceedings of Fifth International Conference on Research Challenges in Information Science (RCIS), 2011
Gosier (Guadeloupe), France

hal-00688162
https://hal.archives-ouvertes.fr/hal-00688162
DOI : 10.1109/RCIS.2011.6006871

Éditeur(s) : HAL CCSD
Résumé : National audience
Dans cet article, nous présentons une généralisation de l'opérateur d'agrégation 3Pi. Cette généralisation est appelée G3Pi, et peut être utilisée pourrésumer des éléments d'une série temporelle sur un intervalle. Quelques-unes des inégalités de cette généralisation sont présentées et démontrées.
Actes de l'Atelier de Fouille de données complexes : complexité liée aux données multiples et massives - AFD- EGC 2013

hal-00834021
https://hal.archives-ouvertes.fr/hal-00834021

Éditeur(s) : HAL CCSD
Résumé : International audience
CSTST 2008: Proceedings of the 5th International Conference on Soft Computing as Transdisciplinary Science and Technology
Cergy Pontoise, France

hal-00605235
https://hal.archives-ouvertes.fr/hal-00605235

Éditeur(s) : HAL CCSD Lavoisier
Résumé : National audience
ISSN: 0765-0019

hal-00605234
https://hal.archives-ouvertes.fr/hal-00605234

Éditeur(s) : HAL CCSD Juliusz Schauder University Centre for Nonlinear Studies
Résumé : International audience
ISSN: 1230-3429

hal-01545552
https://hal.archives-ouvertes.fr/hal-01545552
DOI : 10.12775/TMNA.1999.016