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Author: MOURAD.. SEFRIOUI
Publisher:
ISBN:
Category :
Languages : fr
Pages : 244
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Book Description
UN ALGORITHME EVOLUTIONNAIRE (AE) EST UN PROCESSUS STOCHASTIQUE QUI S'INSPIRE DES MECANISMES DE L'EVOLUTION NATURELLE. IL GERE NON PAS UNE SOLUTION CANDIDATE UNIQUE, MAIS UNE POPULATION DE SOLUTIONS POTENTIELLES, QU'IL FAIT EVOLUER. LES AES, DE PAR LEUR ROBUSTESSE, SONT TOUT INDIQUES POUR TRAITER LES PROBLEMES D'OPTIMISATION DIFFICILES POUR LES METHODES DETERMINISTES. C'EST DANS LE CADRE DE L'APPLICATION D'UN AE A DES PROBLEMES ISSUS DE L'ELECTROMAGNETISME ET DE LA MECANIQUE DES FLUIDES QUE S'INSCRIT CE TRAVAIL. LA PREMIERE PARTIE CONCERNE L'ACCELERATION DE LA CONVERGENCE, QUI VISE A FAIRE CONVERGER UN TEL ALGORITHME EN UN NOMBRE RAISONNABLE D'ITERATIONS. C'EST UNE CONDITION SINE QUA NON POUR POUVOIR ETRE ACCEPTABLE D'UN POINT DE VUE INDUSTRIEL. DANS CETTE OPTIQUE, NOUS AVONS MIS AU POINT PLUSIEURS TECHNIQUES, DONT LA PLUS EFFICACE REPOSE SUR L'UTILISATION D'UN TAUX DE MUTATION DYNAMIQUE, QUI EST FONCTION DE LA DISTANCE INTER-SOLUTIONS. LE SECOND VOLET DE CE TRAVAIL CONSISTE A INTEGRER A UN AE DES CONCEPTS DE LA THEORIE DES JEUX, POUR POUVOIR TRAITER DE MANIERE EFFICACE LES OPTIMISATIONS MULTI-OBJECTIFS. EN EFFET, LA THEORIE DES JEUX OFFRE UN CADRE FORMEL POUR LE TRAITEMENT D'OPTIMISATIONS MULTI-CRITERES. OUTRE LES EQUILIBRES DE PARETO, NOUS PROPOSONS DEUX NOUVELLES APPROCHES FONDEES SUR LES EQUILIBRES DE NASH ET DE STACKELBERG. LES EQUILIBRES DE NASH CONCERNENT DES JEUX NON-COOPERATIFS, ALORS QUE LES EQUILIBRES DE STACKELBERG PROPOSE UNE HIERARCHISATION DES CRITERES. ENFIN, LA DERNIERE PARTIE PRESENTE UN PARADIGME DERIVE DES AE CLASSIQUES, CELUI DES ALGORITHMES GENETIQUES PARALLELES. CE PARADIGME OFFRE UN CERTAIN NOMBRE DE CARACTERISTIQUES INSPIREES DE LA DYNAMIQUE DES POPULATIONS. LES METHODES PRESENTEES SONT TOUTES D'ABORD EVALUEES A TRAVERS DES FONCTIONS-TESTS CLASSIQUES, AVANT D'ETRE APPLIQUEES A DES PROBLEME D'OPTIMISATION ISSUS SOIT DE L'ELECTROMAGNETISME SOIT DE LA MECANIQUE DES FLUIDES NUMERIQUES.
Author: MOURAD.. SEFRIOUI
Publisher:
ISBN:
Category :
Languages : fr
Pages : 244
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Book Description
UN ALGORITHME EVOLUTIONNAIRE (AE) EST UN PROCESSUS STOCHASTIQUE QUI S'INSPIRE DES MECANISMES DE L'EVOLUTION NATURELLE. IL GERE NON PAS UNE SOLUTION CANDIDATE UNIQUE, MAIS UNE POPULATION DE SOLUTIONS POTENTIELLES, QU'IL FAIT EVOLUER. LES AES, DE PAR LEUR ROBUSTESSE, SONT TOUT INDIQUES POUR TRAITER LES PROBLEMES D'OPTIMISATION DIFFICILES POUR LES METHODES DETERMINISTES. C'EST DANS LE CADRE DE L'APPLICATION D'UN AE A DES PROBLEMES ISSUS DE L'ELECTROMAGNETISME ET DE LA MECANIQUE DES FLUIDES QUE S'INSCRIT CE TRAVAIL. LA PREMIERE PARTIE CONCERNE L'ACCELERATION DE LA CONVERGENCE, QUI VISE A FAIRE CONVERGER UN TEL ALGORITHME EN UN NOMBRE RAISONNABLE D'ITERATIONS. C'EST UNE CONDITION SINE QUA NON POUR POUVOIR ETRE ACCEPTABLE D'UN POINT DE VUE INDUSTRIEL. DANS CETTE OPTIQUE, NOUS AVONS MIS AU POINT PLUSIEURS TECHNIQUES, DONT LA PLUS EFFICACE REPOSE SUR L'UTILISATION D'UN TAUX DE MUTATION DYNAMIQUE, QUI EST FONCTION DE LA DISTANCE INTER-SOLUTIONS. LE SECOND VOLET DE CE TRAVAIL CONSISTE A INTEGRER A UN AE DES CONCEPTS DE LA THEORIE DES JEUX, POUR POUVOIR TRAITER DE MANIERE EFFICACE LES OPTIMISATIONS MULTI-OBJECTIFS. EN EFFET, LA THEORIE DES JEUX OFFRE UN CADRE FORMEL POUR LE TRAITEMENT D'OPTIMISATIONS MULTI-CRITERES. OUTRE LES EQUILIBRES DE PARETO, NOUS PROPOSONS DEUX NOUVELLES APPROCHES FONDEES SUR LES EQUILIBRES DE NASH ET DE STACKELBERG. LES EQUILIBRES DE NASH CONCERNENT DES JEUX NON-COOPERATIFS, ALORS QUE LES EQUILIBRES DE STACKELBERG PROPOSE UNE HIERARCHISATION DES CRITERES. ENFIN, LA DERNIERE PARTIE PRESENTE UN PARADIGME DERIVE DES AE CLASSIQUES, CELUI DES ALGORITHMES GENETIQUES PARALLELES. CE PARADIGME OFFRE UN CERTAIN NOMBRE DE CARACTERISTIQUES INSPIREES DE LA DYNAMIQUE DES POPULATIONS. LES METHODES PRESENTEES SONT TOUTES D'ABORD EVALUEES A TRAVERS DES FONCTIONS-TESTS CLASSIQUES, AVANT D'ETRE APPLIQUEES A DES PROBLEME D'OPTIMISATION ISSUS SOIT DE L'ELECTROMAGNETISME SOIT DE LA MECANIQUE DES FLUIDES NUMERIQUES.
Author: Jacques Periaux
Publisher: Springer
ISBN: 9401795207
Category : Technology & Engineering
Languages : en
Pages : 323
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Book Description
Many complex aeronautical design problems can be formulated with efficient multi-objective evolutionary optimization methods and game strategies. This book describes the role of advanced innovative evolution tools in the solution, or the set of solutions of single or multi disciplinary optimization. These tools use the concept of multi-population, asynchronous parallelization and hierarchical topology which allows different models including precise, intermediate and approximate models with each node belonging to the different hierarchical layer handled by a different Evolutionary Algorithm. The efficiency of evolutionary algorithms for both single and multi-objective optimization problems are significantly improved by the coupling of EAs with games and in particular by a new dynamic methodology named “Hybridized Nash-Pareto games”. Multi objective Optimization techniques and robust design problems taking into account uncertainties are introduced and explained in detail. Several applications dealing with civil aircraft and UAV, UCAV systems are implemented numerically and discussed. Applications of increasing optimization complexity are presented as well as two hands-on test cases problems. These examples focus on aeronautical applications and will be useful to the practitioner in the laboratory or in industrial design environments. The evolutionary methods coupled with games presented in this volume can be applied to other areas including surface and marine transport, structures, biomedical engineering, renewable energy and environmental problems. This book will be of interest to students, young scientists and engineers involved in the field of multi physics optimization.
Author: Pekka Neittaanmäki
Publisher: Springer Nature
ISBN: 3031290828
Category : Technology & Engineering
Languages : en
Pages : 451
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Book Description
This book analyzes the impact of scientific computing in science and society over the coming decades. It presents advanced methods that can provide new possibilities to solve scientific problems and study important phenomena in society. The chapters cover Scientific computing as the third paradigm of science as well as the impact of scientific computing on natural sciences, environmental science, economics, social science, humanistic science, medicine, and engineering. Moreover, the book investigates scientific computing in high performance computing, quantum computing, and artificial intelligence environment and what it will be like in the 2030s and 2040s.
Author: SANA.. BEN HAMIDA
Publisher:
ISBN:
Category :
Languages : fr
Pages : 232
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Book Description
CETTE THESE EST UNE ETUDE THEORIQUE ET EXPERIMENTALE DANS LE DOMAINE DU CALCUL EVOLUTIONNAIRE. LA PREMIERE PARTIE PROPOSE UNE INTRODUCTION AU DOMAINE DE L'EVOLUTION ARTIFICIELLE AVEC UNE SYNTHESE DES PRINCIPALES APPROCHES. LA DEUXIEME PARTIE EST UNE ETUDE THEORIQUE CONSACREE A LA PRISE EN COMPTE DES CONTRAINTES DANS L'OPTIMISATION EVOLUTIONNAIRE. SON PREMIER CHAPITRE EST UNE PRESENTATION DETAILLEE DES METHODES DANS LA LITTERATURE ACCOMPAGNEE D'UNE DISCUSSION DE LEURS AVANTAGES ET LIMITATIONS. POUR REMEDIER A CERTAINES LIMITATIONS, DEUX SOLUTIONS SONT PROPOSEES. LA PREMIERE VISE L'AMELIORATION DE LA CAPACITE D'EXPLORATION DES OPERATEURS DE REPRODUCTION EN PRESENCE DES CONTRAINTES. ELLE PROPOSE L'OPERATEUR DE MUTATION LOGARITHMIQUE CONCU POUR EXPLORER A LA FOIS LOCALEMENT ET GLOBALEMENT L'ESPACE DE RECHERCHE. LA DEUXIEME EST UNE PROPOSITION D'UN NOUVEL ALGORITHME POUR LA PRISE EN COMPTE DES CONTRAINTES (ASCHEA), BASE SUR TROIS INGREDIENTS : UNE PENALITE ADAPTATIVE AJUSTEE AUTOMATIQUEMENT SELON L'ETAT COURANT DE LA POPULATION, ; UN OPERATEUR GENETIQUE FONDE SUR LE CONCEPT DE SEDUCTION OU, DANS CERTAINS CAS, LES INDIVIDUS FAISABLES NE PEUVENT SE REPRODUIRE QU'AVEC LES INFAISABLES DANS LE BUT D'EXPLORER LA FRONTIERE DE LA REGION FAISABLE ; UN MECANISME DE SELECTION SEGREGATIONNELLE EN TERME FAISABLE/INFAISABLE DONT L'OBJECTIF EST D'ASSURER UN DEGRE MINIMUM DE FAISABILITE DE LA POPULATION. POUR GERER LES FONCTIONS MULTIMODALES, UNE PROCEDURE DE NICHAGE A ETE INTRODUITE, DONT LE RAYON EST ADAPTE AUTOMATIQUEMENT. FINALEMENT, POUR COMPLETER LE SYSTEME ASCHEA, UNE NOUVELLE STRATEGIE DE PRISE EN COMPTE DES CONTRAINTES D'EGALITE LUI A ETE INTRODUITE, QUI RESTREINT PROGRESSIVEMENT LE DOMAINE DE FAISABILITE DES SOLUTIONS EXPLOREES DANS LE BUT DE L'APPROCHER A LA FIN DE L'EVOLUTION DE L'ESPACE REEL DE MESURE NULLE. LA TROISIEME PARTIE EST UNE ETUDE D'UNE APPLICATION REELLE AYANT POUR OBJECTIF L'OPTIMISATION DU PROFIL D'UNE LAME DE PHASES POUR LE LASER MEGA-JOULE. LE BUT EST DE MINIMISER LA PERTE D'ENERGIE SUR LE PLAN FOCAL DU SYSTEME LASER ET LA REPARTIR UNIFORMEMENT SUR LA CIBLE A ILLUMINER.
Author: I.C. Parmee
Publisher: Springer Science & Business Media
ISBN: 0857293389
Category : Computers
Languages : en
Pages : 385
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Book Description
The Adaptive Computing in Design and Manufacture conference series has become a well-established, largely application-oriented meeting recognised by several UK Engineering Institutions and the International Society of Genetic and Evolutionary Computing. The main theme of the series relates to the integration of evolutionary and adaptive computing technologies with design and manufacturing processes whilst also taking into account complementary advanced computing technologies. Evolutionary and adaptive computing techniques continue to increase their penetration of industrial and commercial practice as awareness of their powerful search, exploration and optimisation capabilities becomes ever more prevalent, and increasing desk-top computational capability renders stochastic population-based search a far more viable proposition. There has been a significant increase in the development and integration of commercial software tools utilising adaptive computing technologies and the emergence of related commercial research and consultancy organisations supporting the introduction of best practice in terms of industrial utilisation. The book is comprised of selected papers that cover a diverse set of industrial application areas including engineering design and design environments and manufacturing process design, scheduling and control. Various aspects of search, exploration and optimisation are investigated in the context of integration with industrial processes including multi-objective and constraint satisfaction, development and utilization of meta-models, algorithm and strategy development and human-centric evolutionary approaches. The role of agent-based and neural net technologies in terms of supporting search processes and providing an alternative simulation environment is also explored. This collection of papers will be of particular interest to both industrial researchers and practitioners in addition to the academic research communities across engineering, operational research and computer science.
Author: Marc Schoenauer
Publisher: Springer
ISBN: 3540453563
Category : Computers
Languages : en
Pages : 920
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Book Description
We are proud to introduce the proceedings of the Sixth International Conference on Parallel Problem Solving from Nature, PPSN VI, held in Paris, Prance, on 18-20 September 2000. PPSN VI was organized in association with the Genetic and Evolutionary Computing Conference (GECCO'2000) and the Congress on Evolutionary Computation (CEC'2000), reflecting the beneficial interaction between the conference activities in Europe and in the USA in the field of natural computation. Starting in 1990 in Dortmund, Germany (Proceedings, LNCS vol. 496, Sprin ger, 1991), this biannual meeting has been held in Brussels, Belgium (Procee dings, Elsevier, 1992), Jerusalem, Israel (Proceedings, LNCS vol. 866, Springer, 1994), Berlin, Germany (Proceedings, LNCS vol. 1141, Springer, 1996), and Amsterdam, The Netherlands (Proceedings, LNCS vol. 1498, Springer, 1998), where it was decided that Paris would be the location of the 2000 conference with Marc Schoenauer as the general chair. The scientific content of the PPSN conference focuses on problem solving pa radigms gleaned from a natural models. Characteristic for Natural Computing is the metaphorical use of concepts, principles and mechanisms underlying natural systems, such as evolutionary processes involving mutation, recombination, and selection in natural evolution, annealing or punctuated equilibrium processes of many-particle systems in physics, growth processes in nature and economics, collective intelligence in biology, DNA-based computing in molecular chemistry, and multi-cellular behavioral processes in neural and immune networks.
Author: Jacques Periaux
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 450
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Author: D. Keyes
Publisher: Elsevier
ISBN: 008053838X
Category : Mathematics
Languages : en
Pages : 477
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Book Description
Contributed presentations were given by over 50 researchers representing the state of parallel CFD art and architecture from Asia, Europe, and North America. Major developments at the 1999 meeting were: (1) the effective use of as many as 2048 processors in implicit computations in CFD, (2) the acceptance that parallelism is now the 'easy part' of large-scale CFD compared to the difficulty of getting good per-node performance on the latest fast-clocked commodity processors with cache-based memory systems, (3) favorable prospects for Lattice-Boltzmann computations in CFD (especially for problems that Eulerian and even Lagrangian techniques do not handle well, such as two-phase flows and flows with exceedingly multiple-connected demains with a lot of holes in them, but even for conventional flows already handled well with the continuum-based approaches of PDEs), and (4) the nascent integration of optimization and very large-scale CFD. Further details of Parallel CFD'99, as well as other conferences in this series, are available at http://www.parcfd.org
Author: Noel G. Barton
Publisher: Springer Science & Business Media
ISBN: 354044873X
Category : Technology & Engineering
Languages : en
Pages : 325
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Book Description
This volume contains the proceedings of a workshop held in Melbourne, Australia, entitled "Coupling of Fluids, Structures and Waves in Aeronautics". The 22 papers deal with new computational methods for multi-disciplinary design in aeronautics. They are grouped into chapters on fluids, structures, electromagnetics, optimisation, mathematical methods and tools, and aircraft design. Several papers treat coupling of these themes in a multi-physics setting. Included is a 17-page report of a Round Table discussion entitled "Future Tools for Design and Manufacture of Innovative Products in the Aeronautics Industry", together with a summary of important themes and issues. This research promotes the advanced technologies necessary for continued development of efficient and environmentally sustainable transport systems.
Author: Jacques Periaux
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 624
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Book Description
