Scientific activities

My research themes concern numerical simulation applied to the resolution of complex problems of very large sizes for multidisciplinary applications. The problems discussed fall of mathematics, of physics, of bioinformatics, Mechanical, process engineering, economics and algorithms of the text.

My contributions are on the one hand towards the implementation of parallel synchronous and asynchronous computational methods in particular on the stopping tests of iterations in a framework of asynchronous computations and on the other hand on the lessons that can be drawn from behavior of the experiments in connection with the architecture of the machines used and the speed of the interconnection network.

The use of these methods is interesting for the numerical simulation of industrial applications and the applications dealt with concerned :

- new strongly nonlinear partial differential problems by the multi-domain method - view Publications [J7] and [J8],

- problems coupled in biology for separation of proteins by electrophoresis (the model is represented by the Navier-Stokes equations coupled with a convection-diffusion equation and a diffusion equation) - view Publications [J2],

- problems formulated complementary shape applied to the equation of Hamilton-Jacobi-Bellman speaker for instance in image processing or problems with constraints - view Publications [J3],

- fluid-structure interaction problems modeled by the Navier-Stokes equation coupled to the Navier equation - see Publications [J3],

- a fluid mechanics problem - view Publications [J4],

- a convection-diffusion problem applied to denoising and segmentation of dynamic PET images - see Publications [C15],

- a steel solidification problem modeled by an equation of the heat taking into account the radiation phenomena at the border - view Publications [J6],

- a speaker problem in mathematics financial modeled by the Black Scholes equation - view Publications [C11],

- a repetition detecting problem involved in algorithmic text, Molecular (DNA sequences) and data compression - see Publications [J1].

A partir des modélisations effectuées par les experts du domaine, I have contributed to the implementation of parallel or distributed algorithms, asynchronous or synchronous to solving problems mentioned above and realize simulations using the high-performance computing on dedicated architectures (HPC, grille, cluster, simulateur peer to peer). The analyzes of the experiments made it possible to show a significant saving in execution time for asynchronous methods compared to synchronous ones in the case of geographically distant machines.

More, due to the multidisciplinary particularity of this research theme, my work can be integrated into many other areas and multidisciplinary scientific topics, for which skills, in supercomputing, parallel or distributed architectures would be required.

Development and simulation grids of parallel algorithms from a mathematical modeling of operations research problems concerning telephone server networks in partnership with INP | IRIT-ENSEEIHT - Pierre Spiteri and Badji Mokhtar University of Annaba in the context of co-regulation of the post-Ph.D. Nesrine Zidani Lecturer.

asynchronous parallel novel problem solving partial differential strongly nonlinear multisplitting by the method in partnership with INP | IRIT-ENSEEIHT - Pierre Spiteri and UTBM Belfort | FEMTO-ST - Raphael Couturier and Lilia Ziane Khodja.

In partnership with INP | IRIT-ENSEEIHT - Pierre Spiteri and Badji Mokhtar University Annaba | LaPS – Hacene Boutabia, resolution of financial mathematics problems, corresponding to a collaboration between probabilistic and numericians ; Taking into account the model where the volatility is stochastic, by coupling the Cox Ingersoll Ross than Ornstein Uhlenbeck which leads to solve algebraic systems of larger sizes by iterative asynchronous parallel methods ;

In partnership with INP | IRIT-ENSEEIHT - Pierre Spiteri and Annaba Badji Mokhtar University - Abdelhamid and Laouar Skikda University | LAMAHIS - Amel Hannache, solving partial differential equations constrained modeling problems plates ;

In partnership with INP | IRIT-ENSEEIHT - Pierre Spiteri and the University F. Rabelais Tours | INSERM – Clovis Tauber, resolution parallel filtering problems and PET image segmentation ;

The above applications can be implemented on cluster, grid computing, GPU et cloud.

2009–2011 The project CIP Intensive Computing Peer to peer - http://www.laas.fr/CIS-CIP/, initiated within theInstitute of Computer Science of Toulouse (IRIT) toNational School of Electrical, of Electronics, Hydraulics of Informatics and Telecommunications (ENSEEIHT) - National Institute of Polytechnic (INP) (Team TCI - Treatment and Compréhension ofImages) (Pierre Spiteri – pierre.spiteri @ enseeiht.fr), aimed to provide tools and environments for the implementation of computationally intensive on a peer network architecture simulator to peer. He helped develop an environment for the implementation of intensive calculations on a peer architecture simulation to peer fully decentralized, which is designed for large applications of numerical simulation and optimization with a task parallelism and requires frequent communication between machines. Interest was mainly to solving problems through parallel iterative methods or distributed. To facilitate programming and optimize performance, the environment is based on a set of communications operations reduced ; otherwise the programmer does not have to specify the communication mode, the latter is fixed by the Memorandum so self adaptive and dynamic function of contextual elements of the network layer and indications on the iterative calculation favorite programmer within the application layer. Demonstrators have been made to operations research and numerical simulation. Les partenaires du projet étaient le LAAS-CNRS (Toulouse), the LIFC (Montbéliard), MIS ex Laria (Amiens), and EuroMedTextile (industry association).

2008-2009 Istar project : http://www.i-star.fr (2007-2010), initiated within the Interactive Computing Laboratory toNational School of Civil Aviation (Stéphane Chatty – stephane.chatty@enac.fr), aimed to develop and evaluate a solution for interoperability GUIs, on the basis of a "runtime" (virtual machine) running the programs described in a semantic model dedicated to interactive components. The semantic model has been designed based on a model that organizes an interactive application components into a tree whose leaves are graphic objects, behavior, actions, or algorithms. The project partners were the LRI (Orsay), IntuiLab (SME-Toulouse) et Anyware Technology (SME-Toulouse).

• Durant mon doctorat, I worked on the text of algorithmic problems as the research problem of the longest increasing subsequence, the longest common subsequence two words, the longest repeated suffix each character of a word and repeat. Using parallel algorithms on a fine-grained model (le modèle systolique), the goal was to create a bridge between this model and a coarse-grained model (the CGM - Coarse Grained Multicomputers model) in order to use of computer clusters. An algorithm developed for CGM consists of local computations using optimal sequential algorithms and communication round, the number must be independent of the size of data to be processed. This model is independent of real architectures and makes it possible to reuse efficient sequential algorithms. More, the workload is not the same on each processor when processing solutions, it was proposed a load balancing solution. Finally, an extrapolation of the results of our work was proposed in order to predict what are the possible adaptations of systolic architectures to the CGM model.

  Durant mon DEA, j’ai travaillé sur un micro-noyau embarqué, real-time and distributed. Mon travail a consisté en la gestion des communications entre des capteurs (considered intelligent communicating objects) modeled by fault-tolerant process.

Framing

• In anticipation (2018 – 2020) : Co-supervision of a thesis (Annaba Badji Mokhtar University - Elaid Derbelou) and post-doc of Annaba Badji Mokhtar University - Amel Hannache ;

• 2010-2017 Co-supervision of two postdoctoral (Skikda University | Laanaःis - Ghania Khenniche, Annaba Badji Mokhtar University - Nesrine Zidani) ;

• 2015-2017 Co-supervision of Ph.D. :

Vincent Partimbene with ENSEEIHT-IRIT in partnership with the company Segula Technologies (FIGURES)

Ghania Khenniche Badji Mokhtar with Annaba University

• From 2005, frames of engineering students or training in masters or workplace learning ;

• 2013 Frames of engineering students on a project 3D motion analysis in collaboration with the Foundation Garches et l’APHP (Public Assistance Hospitals of Paris) – CHU Raymond Poincare.

Project management

• Participation in working groups with academic and industrial partners (LAAS-Lab(31), MIS-Lab(80), EuroMed-SME(80), LIFC-Lab(25)) in connection with the project CIP. (2010-2011) ;

• Participation in working groups with academic and industrial partners (LRI-Lab(91), IntuiLab-SME(31), Anyware Technologies-PME(31)) du projet Istar. (2008-2009) ;

• Participation in technical meetings with partners and administrative academic, industrial (Aerospace Valley (31 and 33), Stantum-PME (33), Thales Avionics (33), IntuiLab-SME (31)) and financial (Regions of Aquitaine and Midi-Pyrenees) Project Share-It.

Program Committee

Member of the program committee de la conférence « IEEE International Workshop on Parallel and Distributed Scientific and Engineering Computing (PDSEC) »

Member of the program committee de la conférence « International Conference on Pattern Recognition Systems (ICPRS) »

Member of the program and / or organization committee of journées of the Computer Society of France (SIF)

Reviewer

Reviewer pour le Journal of Parallel and Distributed Computing, Journal of Computational Science, PDSEC

Animation d’ateliers

2018 Observatoire Midi-Pyrénées : guest member to conduct training as part of the HPCpourTous days

2017 CNRS : guest member to lead workshops and a working group during the 4th edition of the National Software Development Days http://devlog.cnrs.fr/jdev2017/t8

Responsabilités et activités au sein de sociétés savantes et associations professionnelles

From 2014, Member of the Bureau (Head of IT resources) and you Board of Directors of the Computer Society of France (SIF)

From 2016, Member of the Bureau (Webmaster) and you Board of Directors of SPECIF-CAMPUS

2014-2019 Editorial Manager from the "On the business side" section of the newsletter 1024 de la SIF