Výsledky vyhledávání - "Olivier Boiteau"

Mixed Precision Low Rank Approximations and their Application to Block Low Rank LU Factorization

Autor: Patrick Amestoy, Olivier Boiteau, Alfredo Buttari, Matthieu Gerest, Fabienne Jézéquel, Jean-Yves L’Excellent, Theo Mary

Publikováno v: IMA Journal of Numerical Analysis
IMA Journal of Numerical Analysis, Oxford University Press (OUP), 2022, ⟨10.1093/imanum/drac037⟩

We introduce a novel approach to exploit mixed precision arithmetic for low-rank approximations. Our approach is based on the observation that singular vectors associated with small singular values can be stored in lower precisions while preserving h

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::94c8cf1bd85fe7b1dab6b296ab6bf67c
https://hal.archives-ouvertes.fr/hal-03251738

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Space-Time Residual-Based a posteriori Estimator for the $A-\varphi$ Formulation in Eddy Current Problems

Autor: O. Moreau, Olivier Boiteau, Serge Nicaise, Roberta Tittarelli, Francis Piriou, Emmanuel Creusé, Yvonnick Le Menach

Publikováno v: IEEE Transactions on Magnetics. 51:1-5

In this paper, an a posteriori residual error estimator is presented for the 3-D eddy current problem modeled by the space-time ${A}-\varphi $ potential formulation. It is solved by the finite element method in space and the backward Euler scheme in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7f3fd06ce231ffe72071f3c260ff64aa
https://doi.org/10.1109/tmag.2014.2354357

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Improving Multifrontal Methods by Means of Block Low-Rank Representations

Autor: Patrick R. Amestoy, Olivier Boiteau, Cleve Ashcraft, Jean-Yves L'Excellent, Clement Weisbecker, Alfredo Buttari

Publikováno v: SIAM Journal on Scientific Computing
SIAM Journal on Scientific Computing, Society for Industrial and Applied Mathematics, 2015, 37 (3), pp.A1451-A1474. ⟨10.1137/120903476⟩
SIAM Journal on Scientific Computing, 2015, 37 (3), pp.A1451-A1474. ⟨10.1137/120903476⟩

International audience; Matrices coming from elliptic partial differential equations have been shown to have alow-rank property: well-defined off-diagonal blocks of their Schur complements can be approximatedby low-rank products. Given a suitable ord

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3dedbe6f40120ffdeec7bd56a5ca6327
https://hal.inria.fr/hal-01237169

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3D frequency-domain seismic modeling with a Block Low-Rank algebraic multifrontal direct solver

Autor: Romain Brossier, Alfredo Buttari, Patrick R. Amestoy, Clement Weisbecker, Stéphane Operto, Jean-Yves L'Excellent, Olivier Boiteau, Jean Virieux

Publikováno v: SEG Technical Program Expanded Abstracts ; ISSN :1052-3812
Society of Exploration Geophysicists annual meeting (SEG 2013)
Society of Exploration Geophysicists annual meeting (SEG 2013), Society of Exploration Geophysicists, 2013, Houston, Texas, United States. ⟨10.1190/segam2013-0603.1⟩
SEG Technical Program Expanded Abstracts, SEG annual meeting, Houston, TX, USA
SEG Technical Program Expanded Abstracts, SEG annual meeting, Houston, TX, USA, 2013, Houston, Texas, United States. ⟨10.1190/segam2013-0603.1⟩

International audience; Three-dimensional frequency-domain full waveform inversion of fixed-spread data can be efficiently performed in the viscoacoustic approximation when seismic modeling is based on a sparse direct solver. We present a new algebra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2292a5a83c0f73bf708956ca0d42a59a
https://inria.hal.science/hal-00924638

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Matching pursuit algorithm for RCL decomposition with antennas dictionary

Autor: Olivier Boiteau

Publikováno v: Annales Des Télécommunications. 51:130-136

We develop robust algorithms (such as ‘matching pursuit’, ‘orthogonal matching pursuit’ which are methods of computing adaptive signal representations with respect to a nonorthogonal dictionary of basic building blocks) in order to decompose

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9a925959cc01acda1d5246e844de8b33
https://doi.org/10.1007/bf02995503

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HPC for hydraulics and industrial environmental flow simulations

Autor: Eun-Sug Lee, Damien Violeau, David Latino, Emile Razafindrakoto, Olivier Boiteau, R. Issa, Charles Moulinec, Fabien Decung

Publikováno v: Lecture Notes in Computational Science and Engineering ISBN: 9783642144370

This paper describes the parallelization needs required by the TELEMAC system, a complete hydroinformatics tool developed by EDF R&D. A focus on three codes part of the TELEMAC system, namely Estel-3D, Telemac-3D and Spartacus-3D, is achieved. For ea

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::340f7a28f875feb54a74080f3d48baee
https://doi.org/10.1007/978-3-642-14438-7_40

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