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All Internal Meetings

2010

• December 9, 11:00 a.m.
  Mario Arioli: An introduction to Quantum Graphs and their applications


• December 9, 10:00 a.m.
  Leo Liberti: Discrete methods for distance geometry


• September 15, 2.30 p.m.
  Azzam Haidar: On the future of the HPC: How to think Exascale? How the HPC community addresses this challenge, which direction they propose?


• September 14, 2.00 p.m.
  Scott MacLachlan: Multigrid Preconditioning Strategies for the Helmholtz Equation.


• June 24, 11.00 a.m.
  Antonio Mucherino: The Discretizable Molecular Distance Geometry Problem.

• May 18, 2.00 p.m. Ph.D Thesis defense
  Xavier Pinel: A perturbed two-level preconditioner for the solution of three-dimensional heterogeneous Helmholtz problems with applications to geophysics.

2009

• December 17, 10.00 a.m.
  Vincent Boyer: Solving knapsack problems on GPU.

• November 18, 10.00 a.m.
  Cédric Doucet: Solution of sparse linear systems of equations for electrical engineering: the case study of FLUX software.
  

• July 30, 10.00 a.m.
  Julien Langou: Translation and modern Interpretation of thirteen pages of Laplace's 1820 treatise.

• May 28, 11.00 a.m. Wide scientific interest seminar
  Philip Avery: Domain decomposition and FETI-DP: an introduction with applications.

• May 28, 10.00 a.m.
  Zdenek Strakos: Core problem theory in linear approximation problems.

• April 28, 10.30 a.m. Ph.D Thesis defense
  Tzvetomila Slavova: Parallel multifrontal solution of large sparse linear systems in an out-of-core environment.

• February 10, 10.30 a.m. Ph.D Thesis defense
  Mélodie Mouffe: Multilevel optimization in infinity norm and associated stopping criteria.

• January 20, 10.00 a.m.
  Pavel Jiranek: A posteriori error estimates and stopping criteria for iterative solvers.

• January 20, 10.00 a.m.
  Paola Boito: Optimal antireflective preconditioners for signal and image deblurring.

• January 9, 10.00 a.m. Wide scientific interest seminar
  Luis Nunes Vicente: Incorporating Minimum Frobenius Norm Models in Direct Search.

2008

• December 17, 10.30 a.m.
  Ichitaro Yamazaki: Hybrid method for solving highly-indefinite linear systems of equations.

• December 17, 10.30 a.m.
  Jason Riedy: Auctions for Distributed (and Possibly Parallel) Matchings.

• December 16, 10.00 a.m.
  Martin Fuchs: Robust design optimization via potential clouds.

• August 3, 2.30 p.m.
  Vincent Malmedy: Multi-Secant Equations, Approximate Invariant Subspaces and Multigrid Optimization.

• June 23, 11.00 a.m. Ph.D. Thesis defense
  Azzam Haidar: On the parallel scalability of hybrid linear solvers for large 3D problems.

• July 31, 10.00 a.m.
  Pavel Jiranek: On the numerical behavior of Simpler GMRES and GCR.

• May 22, 10.00 a.m.
  Anthony Chronopoulos: Block S-Step Krylov Iterative Methods.

• May 15, 10.00 a.m.
  Isaac Hailperin: Eigenvalue spectrum of twisted mass lattice QCD.

• April 18, 10.00 a.m.
  Dubravka Mijuca: On the multiscale simulations by mixed finite element method in thermoelasticity.

• February 20, 10.30 a.m.
  Claude Tadonki: Parallel Computing for General Purpose Optimisation and New Generation HPC Architectures.

2007

• December 11, 11.00 a.m.
  Adela Pages: Medium-term power planning problem: model and solutions approach.

• October 24, 10.30 a.m. Ph.D. Thesis defense
  Morad Ahmadnasab: Homotopic deviation theory: a qualitative study.

• March 20, 11.00 a.m.
  Anke Troeltzsch: Benchmarking of Bound-constrained Optimisation Tools.

• February 8, 10.00 a.m.
  Caroline Boess: Using model reduction techniques within Incremental 4-Dimensional Variational Data Assimilation.

• February 1, 4.00 p.m.
  Sergey Nazin: Ellipsoidal and Interval Techniques for State Estimation in Linear Dynamical Systems under Model Uncertainty.

• January 11, 10.00 a.m.
  Martin Van Gijzen: Spectral analysis of the discrete Helmholtz operator preconditioned with a shifted Laplacian.

2006

• December 12, 4.30 p.m.
  Gaetano Zanghirati: Parallel approaches to some large-scale optimization problems.

• November 2, 11.00 a.m.
  Xavier Pinel: Flexible GMRES with Deflated Restarting (FGMRES-DR), application to two-dimensional Helmholtz equations proceeding from geophysics.

• September 5, 10.30 a.m.
  Azzam Haidar: Numerical experiments with additive Schwarz preconditioner for non-overlapping domain decomposition in 3D.

• August 25, 2.00 p.m.
  Lina Abdallah: Minimisation des bruits d'avions commerciaux sous contraintes. Recherche de solutions optimales.

• June 13, 2.00 p.m.
  Xavier Vasseur: On the computation of the null space of a sparse matrix.

• May 31, 10.00 a.m.
  Mélodie Mouffe: Use of multi-level trust-region techniques for nonlinear bound constrained optimization problems.

• May 17, 2.00 p.m.
  Philip A. Knight: The Sinkhorn-Knopp Algorithm: Convergence and Applications.

• May 10, 4.00 p.m.
  Fred Wubs: Fast solution of large linear systems in the ocean model THCM.

• May 3, 11.00 a.m.
  Fred Wubs: Mulitilevel ILU preconditioners.

• April 13, 10.00 a.m.
  Jean TSHIMANGA Ilunga: On some preconditioning techniques for systems with multiple right-hand sides.

• March 24, 10.00 a.m. Wide scientific interest seminar
  Alison Ramage: Multigrid Solution of Discrete Convection-Diffusion Equations.

• March 21, 10.30 a.m. Ph.D. Thesis defense
  Marc Baboulin: Solving large dense linear least squares problems on parallel distributed computers. Application to the Earth's gravity field computation.

• January 12, 11.00 a.m. Wide scientific interest seminar
  Marzio Sala: Object-Oriented Programming Techniques for Sparse Linear System Solvers.

2005

• December 13, 10.30 a.m. Habilitation à Diriger des Recherches
  Serge Gratton: Fast and robust solvers in Scientific Computing Applications in Geosciences.

• November 21, 2.00 p.m.
  Hervé Le Berre: Parallelization of an atmospheric model and an introduction to physics in the (mathematical) algo world.

• November 7, 2.00 p.m.
  Frank Hulsemann: On the integration of Code ASTER and Mumps or it is always more complicated than expected.

• October 18, 3.00 p.m.
  Frédéric Magoulès: Mathematical analysis and numerical methods for the parallel solution of some partial differential equations.

• September 20, 11.00 a.m.
  Frank Hulsemann: Pushing geometric multigrid to its limits.

• July 26, 2.00 p.m. Ph.D. Thesis defense
  Emeric Martin: Spectral two-level preconditioners for sequences of linear systems.

• June 28, 11.00 a.m. Wide scientific interest seminar
  M. Garbey: A few challenging problems in computational sciences.

• May 12, 4.00 p.m.
  Morad Ahmadnasab: Homotopic backward analysis for matrix eigenvalues.

• March 7, 9.30 a.m. Wide scientific interest seminar
  Robert A. van de Geijn: Towards the Final Generation of Dense Linear Algebra Libraries.

• February 2, 11.00 a.m.
  Fabian Bastin: Trust-region approaches for nonlinear stochastic programming and mixed logit models.

2004

• October 27, 2.30 p.m.
  Martin van Gijzen: Bounds on the eigenvalue range and on the field of values of non-hermitian and indefinite finite element matrices.

• October 25, 3.00 p.m.
  Jerzy Wasniewski: A hybrid format for blocked Cholesky.

• October 5, 2.00 p.m.
  Songklod Riyavong: Parallel preconditioners based on partitioning sparse matrices.

• September 23, 10.30 a.m.
  Frederic Nataf: Optimized interface conditions in domain decomposition methods in the case of extreme contrasts in the coefficients.

• September 21, 10.00 a.m. Ph.D. Thesis defense
  Stephane Pralet: Constrained orderings and scheduling for parallel sparse linear algebra.

• June 3, 10.00 a.m.
  Gene Golub: Adaptative methods for updating/downdating page ranks.

• June 2, 11.00 a.m.
  Arno Swart: Internal waves in enclosed geometries.

• April 14, 3.00 p.m.
  Michael Overton: Optimizing matrix stability and controllability.

• March 3, 3.00 p.m.
  Mario Arioli: Error energy norm estimations for CG.

• January 7, 10.30 a.m.
  Bruno Carpentieri: Matrix-Free preconditionings of dense linear systems from electromagnetics.

2003

• November 24, 10.00 a.m.
  Philippe Toint: Optimisation: méthodes sans dérivée.

• November 13, 3.00 p.m.
  Marielba Rojas: LSTRS: Matlab software for large-scale trust-region subproblems and regularization.

• October 15, 2.30 p.m.
  Marc Baboulin: Parallel distributed cholesky factorization for in-core large dense problems.

• October 14, 10.30 a.m.
  Christian Hansen: Inverse acoustic problems: sound source reconstruction.

• October 9, 10.30 a.m.
  Julian Hall: Hyper-sparsity in the revised simplex method and how to exploit it.

• September 11, 10.30 a.m.
  Martin van Gijzen: Two-level parallelism in a stream-function model for global ocean circulation.

• August 6, 3.00 p.m.
  Gerard Sleijpen: Accurate conjugate gradient methods for families of shifted systems.

• July 1, 10.00 a.m.
  Emeric Martin: Using spectral information for accelerating the convergence of Gmres for large electromagnetic calculations.

• May 27, 2.00 p.m.
  Julien Langou: Contribution of the numerical linear algebra techniques for solving the monostatic radar cross section calculation, an electromagnetism problem where a large linear system with multiple right-hand sides is involved.

• May 20, 4.00 p.m.
  Philippe Toint: Filter techniques and the nonlinear feasibility problem.

• May 7, 10.30 a.m.
  Songklod Riyavong: Two-dimensional semiconductor device simulation.

• March 20, 10.00 a.m. Ph.D. Thesis defense
  Christof Vömel: Contributions à la recherche en calcul scientifique haute performance pour les matrices creuses.

• February 7, 10.00 a.m.
  Abdellatif EL GHAZI: Similitude simultanée des matrices carrées.

• February 5, 2.00 p.m.
  Shane Mulligan: Numerical methods for semiconductor device modelling.

• January 23, 2.00 p.m.
  Daniel Loghin: Stopping criteria for iterations in finite element methods.

2002

• December 19, 11.00 a.m.
  Alexandre le Blanc: Solving acoustic problems.

• December 12, 3.00 p.m.
  Henri Tufo: Terascale Spectral Element Algorithms and Implementations.

• November 13, 3.00 p.m.
  Jasper van den Eshof: Inexact Krylov subspace methods for linear systems: analysis and practice.

• September 12
  Stephane Pralet: Study and improvement of a sparse multifrontal solver on SMP architecture.

• September 12
  Martin van Gijzen: Homotopic deviation. Recent results using advanced visualisation techniques.

• July 9, 2.30 p.m.
  S. Oliveira: Predicting QR Fill-In.

• May 23, 2.00 p.m.
  L. Grigori: Structure prediction for sparse LU factorization with partial pivoting.

• April 24, 2.00 p.m.
  I. G. Graham: Iterative computation of PDE eigenvalues.

• April 23, 10.00 a.m. Ph.D. Thesis defense
  Bruno Carpentieri: Sparse preconditioners for dense complex linear systems in electromagnetic applications.

• April 23, 2.30 a.m. Ph.D. Thesis defense
  Jean-Christophe Rioual: Solving linear systems for semiconductor device simulations on parallel distributed computers.

• March 13, 10.30 a.m.
  Enric Fontdecaba: Introduction to Automatic Differentiation.

2001

• September 13, 11.00 a.m.
  Miroslav Rozloznik: Residual smoothing techniques: Do they improve the limiting accuracy of iterative solvers?

• September 6, 11.00 a.m.
  Luc Giraud: Mixing MPI and OpenMP on the CERFACS clusters (PCs and Compaq): some preleminary experiments.

• June 14, 2.00 p.m.
  Julien Langou: What builds MGS.

• March 23, 2.00 p.m.
  Christof Voemel: Incremental Norm Estimation for Dense and Sparse Matrices (joint work with I.S. Duff)

• February 15, 11.00 a.m.
  Mario Arioli: A Stopping Criterion for the Conjugate Gradient Algorithm in a Finite Element Method Framework

2000

• September 2, 10.00 a.m.
  Tony Chan: From PDE's and CFD to Image Processing.

• September 1, 11.00 a.m.
  Gary Howell: ELMRES: an oblique projection solver for sparse systems of linear equations (joint work with Desmond Stephens).

• September 1, 11.00 a.m.
  Edmond Chow: Sparse Approximate Inverse Preconditioning.

• July 19, 11.00 a.m.
  Daniel B. Szyld: Algebraic Theory of Additive and Multiplicative Schwarz.

• July 12, 3.00 p.m.
  Osni Marques: Singular values/vectors for all occasions: from Seismology to Information Retrieval

• July 4, 3.00 p.m.
  Michael P. Friedlander: Large-scale nonlinear optimization via sequential linearized constraints (joint work with M. A. Saunders)

• July 3, 2.00 p.m.
  Rasmus Munk Larsen: Efficient and stable minimal residual methods for complex symmetric linear systems and least squares problems with multiple right-hand sides

• June 20, 6.00 p.m.
  Fernando Guevara: Méthodes de décomposition de domaines pour la résolution d'équations aux dérivées partielles

• June 8, 3.00 p.m.
  Charles Audet: Pattern Search Algorithms for Mixed Variable Programming (joint work with John Dennis)

• June 7: Informal workshop on preconditioning techniques for the iterative solution of linear systems
  Masha Sosonkina: Rational approximation preconditiong techniques
  Bruno Carpentieri: Sparse preconditioning techniques in Electromagnetism
  Matthias Bollhöfer: ILUs and factorized approximates inverses
  Julien Langou: Deflations in Block GMRES

• May 30, 3.00 p.m.
  John Dennis: Analysis of Generalized Pattern Search (joint work with Charles Audet)

• May 25, 3.00 p.m.
  John Dennis: A rigorous framework for optimization using surrogate objectives (joint work with Charles Audet and Doug Moore)

• May 12, 2.30 p.m.
  Beresford N. Parlett: Orthogonal Eigenvectors without Gram-Schmidt (for symmetric tridiagonal matrices)

• April 12, 3.00 p.m.
  Christof Vömel: Singular and nearly-singular linear systems

• April 5, 11.00 a.m.
  Sargis Dallakyan:Carrier phase ambiguity resolution in Global Positioning System (GPS).

• March 15, 11.00 a.m.
  Jean-Christophe Rioual: A two-level preconditioner for the Schur complement and application to semi-conductor device modeling.

• March 8, 11.00 a.m.
  Bruno Carpentieri: Sparse pattern selection strategies for robust Frobenius norm minimization preconditioners in electromagnetism (joint work with I. Duff and L. Giraud).

• February 23, 11.00 a.m.
  Marielba Rojas: Large-Scale Eigenvalue Problems, Trust Regions and the Regularization of Discrete Ill-Posed Problems.

• February 16, 11.00 a.m.
  Dominique Orban: Asymptotic Complexity for Superlinear Convergence in a Primal-Dual Interior Point Algorithm for Constrained Nonlinear Programming.

1999

• October 15, 2.00 p.m.
  Reiji Suda: A sparsified LU factorization for circuit transient analysis.

• September 24, 2.30 p.m.
  Ghislain Lartigue: Etude d'un solveur parallele en vue de son implantation dans le code industriel AETHER.

• June 30, 2.30 p.m.
  Bruno Carpentieri: Sparse preconditioning of dense problems from electromagnetic applications (joint work with I. Duff and L. Giraud).

• March 11, 11.00 a.m.
  Daniel Lee: Solving PDE by finite volume and domain decomposition method - my experience.

• March 4, 10.30 a.m.
  Luc Giraud: Parallel subdomain-based preconditioner for non-overlapping domain decomposition methods.

• February 25, 11.00 a.m.
  Dominique Orban: A Primal-Dual Trust-Region Algorithm for Minimizing a Non-Convex Function Subject to Bounds and Equality Constraints. Part I: Introduction.

• February 18, 11.00 a.m.
  Jean-Christophe Rioual: A deterministic approach for rounding-error analysis. Implementation via automatic differentiation.

• February 11, 11.00 a.m.
  Serguei Sokol: Multi Coarse correction with Suboptimal Operators (MCSO) method as linear solver in NSMB code.

• February 1st, 11.00 a.m.
  Bruno Carpentieri: Continuation techniques in numerical bifurcation.

1998

• December 17, 10.00 a.m.
  Sargis Dallakyan: On the Multifractal Approach to thermodynamic Chaos.

• November 24 10.00 a.m.
  Valerie Fraysse (with L. Giraud and H. Kharraz-Aroussi): On the influence of the orthogonalization scheme on the parallel performance of GMRES.

• June 16
  David Lugato: Parallelisation d'un code de previsions meteorologiques a meso-echelles.
  Gabriel Torres: Etude et implantation d'une methode de decomposition de domaines.

• June 15
  Yan Thiaudiere: Implantation d'un gestionnaire de taches paralleles sur reseau heterogene.
  Bruno Thomas: Exemple d'utilisation d'un gestionnaire de taches paralleles.

• January 27
  Serguei Sokol : Multiscale approache for image matching using elastic models.

• January 20
  Licio Bezerra: Mobius Transforms and Solvers for Sparse Generalized Eigenvalue Problems.

1997

• December 2
  Francesca Mazzia: Solving Ordinary Differential Equations by Generalized Adams Methods: properties and implementation techniques.

• November 25
  Vincent Toumazou: Pseudospectra and tools for studying the spectral unstability.

• November 21
  Jean-Yves L'excellent: A distributed multifrontal solver -- Parasol project

• November 18
  Serge Gratton: On the structured backward error analysis for linear systems of the type $A^*Ax=b$.

• November 4
  Jussi Rahola: Solution of dense linear systems in electromagnetic scattering calculations.

• October 28
  Licio Bezerra: Companion Predictor Matrices.

• October 14
  Annick Sartenaer: On the accuracy of nonlinear algorithms : preliminary results for the steepest-descent method.

• October 7
  Oleg Burdakov and Boris Merkulov: A new vector norm for curve fitting and other optimization problems.

• January 23
  Lars Lundin: The structure of the Cauchy-Riemann equations, and how to solve them with a parallel iterative solver.

1996

• October 23
  Lars Lundin: Parallel Computation of Rotating Flows.

• October 8
  Licio Bezerra: Spectral Transformations on Small-Signal Stability Assessment of Large Scale Power Systems.

• September 24
  Petter Wiberg: A Comparison of the HR method and the XHR method for the eigenvalue problem.

• September 17
  Alan McCoy: A Load Balancing Algorithm for Parallel Molecular Dynamics with Short-Range Interactions.

• August 29
  Roldan Pozo (NIST): The Matrix Market: a visual Web resource for numerical matrix data.

• August 30
  Silvia Crivelli (University of Colorado at Boulder): The PMESC Programming Library for Distributed-Memory Computers.

• July 22
  Eric de Sturler (Swiss Center for Scientific Computing): General Truncation Strategies for `Optimal' Krylov Methods.

• July 3
  Philip Knight (University of Strathclyde): Dynamics of the Power Method.

• June 26
  Zhaojun Bai (University of Kentucky): Large Scale Nonsymmetric Eigenvalue Problems and their Numerical Solutions (in the series of CERFACS seminars).

• June 26
  Gita Alaghband (University of Colorado at Denver): Temporal Characterization of Data Movement Demands To Predict Performance of Parallel Programs.

• June 25
  Flavio Dickstein (IM-UFRJ- Brazil): Theoretical and numerical results for a well-reservoir coupling problem.

• June 24
  Howard Elman (University of Maryland): Iterative Methods and Analysis of Linear Systems Arising in Fluid Dynamics.

• June 18
  Charles Broyden (Universit\`a di Bologna): A Breakdown of the Block CG Method.

• June 4
  Miroslav Tuma: The potential fluid flow and the convergence rate of the minimal residual method.
  Keywords: ground-water flow, finite elements methods, large-sparse nonsymmetric indefinite linear systems, minimal-residual methods.

• May 29
  Luiz Carvalho: Parallel Domain Decomposition for Device Modeling Simulation.

• May 21
  Jacko Koster

• April 29
  M. Gross (UPS): Parallel Fast Poisson Solvers.

• April 17
  Michele Benzi: Sparse approximate inverse preconditioning: Why, and how?.

• April 10
  L. Giraud, C. Puglisi and V. Fraysse: what's behind the words parasol, odesim, hypercombats, pineapl ...

1995

• October 26
  Jussi Rahola : Dense linear algebra in electromagnetic scattering.

• October 26
  Eva Sjostrom : Computation of the principal singular vectors of Toeplitz matrices.

• October 6
  Pinar Heggernes, Domingo Gimenez Canovas and David John Miron

• July 19
  Oleg Burdakov : On Using the Minimal Spanning Tree Algorithm for Optimal Secant Approximation of Derivatives.

• May 15
  Luiz Carvalho: Parallel Distributed Implementation of a 3D CFD code using unstructured finite elements.

• May 10
  Serge Gratton : Condition numbers for Least-Squares problems and the QR factorization.

• May 3
  Oleg Burdakov: On properties of Newton's method for smooth and nonsmooth equations.

• February 7
  Eric Suraud : nonlinear electrodynamics towards a 3D simulation.

• January 31
  Oleg Burdakov : How to apply linear solvers to nonlinear problems.

• January 24
  Vincent Toumazou : Spectral portrait computations.

• January 17
  Oleg Burdakov: Research interests.

1994

• December 7
  Thierry Braconnier : Algorithms for nonsymmetric eigenproblems.

• November 29
  Osni Marques : Algorithms for symmetric eigenproblems.

• November 22
  Joao Patricio : Iterative methods for augmented systems.

• October 11
  Luc Giraud : Domain decomposition methods.

• October 4
  Monga-Made Magolu : Blockwise incomplete factorization strategies.

• July 5
  Jerome Perrin : Travaux sur la collection Harwell-Boeing Techniques de decomposition pour la resolution parallele de systemes creux dans un environnement distribue.

• June 27
  Mounir Marrachi : Solving triangular systems using MIMD computers.

• June 14
  Abderrahim Qrichi : Implementation performante du niveau 3 du BLAS sur processeur RISC.

• June 7
  Abdelhak Haimoura : Developpement de noyaux de calculs dans un environnement distribue.

• June 7
  Serge Gratton : Stabilite de problemes de moindres carres pour l'orbitographie.

• May 31
  Eric Sevault : All about IPM.

• April 26
  Vincent Toumazou : Spectral portraits of large matrices.

• April 19
  Feng-Shou Zhang : Molecular Dynamics Simulations of Na Clusters, Thermodynamic Properties and cluster collisions.

• April 5
  Tony Drummond: A parallel iterative solver.

• March 29
  Jacko Koster : Parallel sparse LU decomposition on distributed memory multiprocessors.

• March 15
  Joao Patricio : Direct sparse solvers for specific problems: some theory and applications.

• March 14
  Chiara Puglisi : Direct sparse methods.

• March 8
  Thierry Braconnier : Nonnormal eigenvalue problems.

• March 1
  Osni Marques : Some Lanczos algorithm applications.

• February 22
  Ali Bouaricha : Large sparse unconstrained optimization.

• February 15
  Valerie Fraysse : Qualitative Computing.