Download or read book Contributions la r solution parall le de probl mes d optimisation combinatoire written by El-Ghazali Talbi and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contributions la r solution de probl mes d optimisation combinatoire sur grilles de calcul written by Nouredine Melab and published by . This book was released on 2005 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: D'autre part, l'analyse s'inscrit dans une démarche méthodologique de mise en place d'une plate-forme d'aide à la mise en oeuvre de méthodes d'optimisation réutilisables en termes de conception et de code. Une étude comparative des plates-formes d'optimisation existantes nous a permis d'identifier les limites de celles-ci surtout en matière de parallélisme en particulier à grande échelle. Ces limites ont motivé la proposition d'une nouvelle plate-forme logicielle libre (http://www.lifl.fr/~cahon/PARADISEO) dans le cadre du projet ACI GRID DOC-G (Défis en Optimisation Combinatoire sur Grilles), appelée ParadisEO, d'aide à la conception de métaheuristiques pour différents types d'architectures parallèles et notamment les grilles de calcul. Comparée aux autres plates-formes, ParadisEO apparaît comme l'une des plus abouties à plus d'un titre : (1) étant basée sur une séparation conceptuelle claire entre les méthodes de résolution et les problèmes à traiter, elle permet une réutilisation maximum de code et de conception ; (2) elle est d'une grande utilité en ce sens qu'elle intègre une large variété de méthodes mono et multi-objectifs, différents modèles parallèles et mécanismes d'hybridation (3) elle est portable et permet l'exploitation transparente du parallélisme à grande échelle et d'un mécanisme de checkpointing intégré à la plate-forme. Cette plate-forme a été validée sur différents problèmes notamment deux problèmes réels : la conception (ou design) de réseaux cellulaires (Contrat France Telecom R&D) et l'extraction de connaissances en spectroscopie proche infrarouge (PIR) (Collaboration avec le laboratoire LASIR, Université de Lille1).

Download or read book Contribution la r solution de probl mes d optimisation combinatoire written by Mohamed Esseghir Lalami and published by . This book was released on 2012 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les problèmes d'optimisation combinatoire sont souvent des problèmes très difficiles dont la résolution par des méthodes exactes peut s'avérer très longue ou peu réaliste. L'utilisation de méthodes heuristiques permet d'obtenir des solutions de bonne qualité en un temps de résolution raisonnable. Les heuristiques sont aussi très utiles pour le développement de méthodes exactes fondées sur des techniques d'évaluation et de séparation. Nous nous sommes intéressés dans un premier temps à proposer une méthode heuristique pour le problème du sac à dos multiple MKP. L'approche proposée est comparée à l'heuristique MTHM et au solveur CPLEX. Dans un deuxième temps nous présentons la mise en oeuvre parallèle d'une méthode exacte de résolution de problèmes d'optimisation combinatoire de type sac à dos sur architecture GPU. La mise en oeuvre CPU-GPU de la méthode de Branch and Bound pour la résolution de problèmes de sac à dos a montré une accélération de 51 sur une carte graphique Nvidia Tesla C2050. Nous présentons aussi une mise en oeuvre CPU-GPU de la méthode du Simplexe pour la résolution de problèmes de programmation linéaire. Cette dernière offre une accélération de 12.7 sur une carte graphique Nvidia Tesla C2050. Enfin, nous proposons une mise en oeuvre multi-GPU de l'algorithme du Simplexe, mettant à contribution plusieurs cartes graphiques présentes dans une même machine (2 cartes Nvidia Tesla C2050 dans notre cas). Outre l'accélération obtenue par rapport à la mise en oeuvre séquentielle de la méthode du Simplexe, une efficacité de 96.5 % est obtenue, en passant d'une carte à deux cartes graphiques.

Download or read book Mod lisation et r solution de probl mes d optimisation combinatoire par la programmation math matique en variables mixtes written by Karima Djebali and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contribution l algorithmique parall le et distribu e written by Ivan Lavallée and published by . This book was released on 1986 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: ETUDE DE LA TERMINAISON DISTRIBUEE. RECHERCHE DES PLUS COURTS CHEMINS DANS UN GRAPHE VALUE, RECHERCHE D'UN ARBRE COUVRANT, ENUMERATION IMPLICITE PARALLELE SONT 3 PROBLEMES COMBINATOIRES POUR LESQUELS EST DONNEE LA PARTICULARISATION A UN ENVIRONNEMENT PARALLELE TYPE PRAM

Download or read book Une approche efficace pour le passage sur grilles de calcul de m thodes d optimisation combinatoire written by Mohand Mezmaz and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La résolution exacte de problèmes d'optimisation combinatoire de grande taille constitue un défi pour les grilles. En effet, il est nécessaire de repenser les algorithmes de résolution pour prendre en compte les caractéristiques de tels environnements. notamment leur grande échelle. l'hétérogénéité et la disponibilité dynamique de leurs ressources. et leur nature multi-domaine d'administration. Dans cette thèse, nous avons proposé une nouvelle approche de passage sur grilles des méthodes exactes de type Branch-and-Bound appelée B&B@Grid. Cette approche est basée sur un codage des unités de travail sous forme d'intervalles permettant de minimiser le coût des communications induites par les opérations de régulation de charge, de tolérance aux pannes et de détection de la terminaison. Cette approche. environ 100 fois plus performante en terme de coût de communication que la meilleure approche connue. a permis la résolution optimale sur la grille nationale Grid5000 d'une instance standard du problème du Flow-Shop restée non résolue depuis une quinzaine d'années. Pour accélérer la résolution. nous avons également étudié la coopération sur la grille de la méthode exacte avec une méta-heuristique parallèle hybride. Deux modes de coopération ont été considérés : le mode relais où la méta-heuristique est exécutée avant la méthode exacte, le mode co-évolutionnaire où les deux méthodes sont exécutées en parallèle. La mise en oeuvre d'une telle coopération sur la grille nous a amené il proposer une extension du modèle de coopération Linda.

Download or read book Contribution la R solution Des Probl mes Combinatoires written by Sagvan Ali Saleh and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combinatorial optimization problems are of high interest both for the scientific world and for the industrial world. The research community has simplified many practical situations as combinatorial optimization problems. Among these problems, we can find some problems belonging to the knapsack family. This thesis considers a particular problem belonging to the knapsack family, known as the disjunctively constrained knapsack problem. Because of the difficulty of this problem, we are searching for approximate solution techniques with fast solution times for its large scale instances. A promising way to solve the disjunctively constrained knapsack problem is to consider some techniques based upon the principle of neighborhood search. Although such techniques produce approximate solution methods, they allow us to present fast algorithms that yield interesting solutions within a short average running time. In order to tackle large scale instances of the disjunctively constrained knapsack problem, we present sequential and parallel algorithms based upon neighborhood search techniques. The first algorithm can be viewed as a random neighborhood search method. This algorithm uses a combination of neighborhood search techniques in order to randomly explore a series of sub-solution spaces, where each subspace is characterized by a neighborhood of a local optimum. The second algorithm is an adaptive neighborhood search that guides the search process in the feasible solution space towards high quality solutions. This algorithm uses an ant colony optimization system to simulate the guided search. The third andlast algorithm is a parallel random neighborhood search method which exploits the parallelism for exploring simultaneously different sub-solution spaces by several processors. Each processor adopts its own random strategy to yield its own neighborhoods according to its internal information.

Download or read book Analyse et r solution approch e de probl mes d optimisation combinatoire written by Benjamin Weinberg and published by . This book was released on 2004 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nous avons exploré plusieurs aspects théoriques et expérimentaux de l'optimisation combinatoire. Premièrement, nous avons défini une notion de structure permettant de s'échapper du résultat du théorème du No Free Lunch. Deuxièmement nous avons formalisé la symétrie de l'espace de recherche des problèmes de partitionnements. A l'aide de cette formalisation, nous pûmes concevoir des outils travaillant efficacement sur cette espace. Plus précisément nous avons développé un test d'égalité, une mesure de distance et un nouvel opérateur de Cross over. Nous avons utilisé ces résultats pour classifier les benchmarks classique de la coloration de graphe. Pour finir, nous avons développe pour ce problème une métaheuristique parallèle qui équilibre l'intensification et la diversification pendant la recherche.

Download or read book M thodes hybrides parall les pour la r solution de probl mes d optimisation combinatoire written by Abdelkader Ouali and published by . This book was released on 2017 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les problèmes d'optimisation combinatoire sont devenus la cible de nombreuses recherches scientifiques pour leur importance dans la résolution de problèmes académiques et de problèmes réels rencontrés dans le domaine de l'ingénierie et dans l'industrie. La résolution de ces problèmes par des méthodes exactes ne peut être envisagée à cause des délais de traitement souvent exorbitants que nécessiteraient ces méthodes pour atteindre la (les) solution(s) optimale(s). Dans cette thèse, nous nous sommes intéressés au contexte algorithmique de résolution des problèmes combinatoires, et au contexte de modélisation de ces problèmes. Au niveau algorithmique, nous avons appréhendé les méthodes hybrides qui excellent par leur capacité à faire coopérer les méthodes exactes et les méthodes approchées afin de produire rapidement des solutions. Au niveau modélisation, nous avons travaillé sur la spécification et la résolution exacte des problématiques complexes de fouille des ensembles de motifs en étudiant tout particulièrement le passage à l'échelle sur des bases de données de grande taille. D'une part, nous avons proposé une première parallélisation de l'algorithme DGVNS, appelée CPDGVNS, qui explore en parallèle les différents clusters fournis par la décomposition arborescente en partageant la meilleure solution trouvée sur un modèle maître-travailleur. Deux autres stratégies, appelées RADGVNS et RSDGVNS, ont été proposées qui améliorent la fréquence d'échange des solutions intermédiaires entre les différents processus. Les expérimentations effectuées sur des problèmes combinatoires difficiles montrent l'adéquation et l'efficacité de nos méthodes parallèles. D'autre part, nous avons proposé une approche hybride combinant à la fois les techniques de programmation linéaire en nombres entiers (PLNE) et la fouille de motifs. Notre approche est complète et tire profit du cadre général de la PLNE (en procurant un haut niveau de flexibilité et d'expressivité) et des heuristiques spécialisées pour l'exploration et l'extraction de données (pour améliorer les temps de calcul). Outre le cadre général de l'extraction des ensembles de motifs, nous avons étudié plus particulièrement deux problèmes : le clustering conceptuel et le problème de tuilage (tiling). Les expérimentations menées ont montré l'apport de notre proposition par rapport aux approches à base de contraintes et aux heuristiques spécialisées.

Download or read book African Doctorates in Mathematics written by and published by Lulu.com. This book was released on 2007 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents a catalogue of over 2000 doctoral theses by Africans in all fields of mathematics, including applied mathematics, mathematics education and history of mathematics. The introduction contains information about distribution by country, institutions, period, and by gender, about mathematical density, and mobility of mathematicians. Several appendices are included (female doctorate holders, doctorates in mathematics education, doctorates awarded by African universities to non-Africans, doctoral theses by non-Africans about mathematics in Africa, activities of African mathematicians at the service of their communities). Paulus Gerdes compiled the information in his capacity of Chairman of the African Mathematical Union Commission for the History of Mathematics in Africa (AMUCHMA). The book contains a preface by Mohamed Hassan, President of the African Academy of Sciences (AAS) and Executive Director of the Academy of Sciences for the Developing World (TWAS). (383 pp.)

Download or read book Multiple Criteria Optimization written by Xavier Gandibleux and published by Springer Science & Business Media. This book was released on 2006-04-11 with total page 515 pages. Available in PDF, EPUB and Kindle. Book excerpt: The generalized area of multiple criteria decision making (MCDM) can be defined as the body of methods and procedures by which the concern for multiple conflicting criteria can be formally incorporated into the analytical process. MCDM consists mostly of two branches, multiple criteria optimization and multi-criteria decision analysis (MCDA). While MCDA is typically concerned with multiple criteria problems that have a small number of alternatives often in an environment of uncertainty (location of an airport, type of drug rehabilitation program), multiple criteria optimization is typically directed at problems formulated within a mathematical programming framework, but with a stack of objectives instead of just one (river basin management, engineering component design, product distribution). It is about the most modern treatment of multiple criteria optimization that this book is concerned. I look at this book as a nicely organized and well-rounded presentation of what I view as ”new wave” topics in multiple criteria optimization. Looking back to the origins of MCDM, most people agree that it was not until about the early 1970s that multiple criteria optimization c- gealed as a field. At this time, and for about the following fifteen years, the focus was on theories of multiple objective linear programming that subsume conventional (single criterion) linear programming, algorithms for characterizing the efficient set, theoretical vector-maximum dev- opments, and interactive procedures.

Download or read book Combinatorial Data Analysis written by Lawrence Hubert and published by SIAM. This book was released on 2001-01-01 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combinatorial data analysis (CDA) refers to a wide class of methods for the study of relevant data sets in which the arrangement of a collection of objects is absolutely central. The focus of this monograph is on the identification of arrangements, which are then further restricted to where the combinatorial search is carried out by a recursive optimization process based on the general principles of dynamic programming (DP).

Download or read book Aiding Decisions with Multiple Criteria written by Denis Bouyssou and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aiding Decisions With Multiple Criteria: Essays in Honor of Bernard Roy is organized around two broad themes: Graph Theory with path-breaking contributions on the theory of flows in networks and project scheduling, Multiple Criteria Decision Aiding with the invention of the family of ELECTRE methods and methodological contribution to decision-aiding which lead to the creation of Multi-Criteria Decision Analysis (MCDA). Professor Bernard Roy has had considerable influence on the development of these two broad areas. £/LIST£ Part one contains papers by Jacques Lesourne, and Dominique de Werra & Pierre Hansen related to the early career of Bernard Roy when he developed many new techniques and concepts in Graph Theory in order to cope with complex real-world problems. Part two of the book is devoted to Philosophy and Epistemology of Decision-Aiding with contributions from Valerie Belton & Jacques Pictet and Jean-Luis Genard & Marc Pirlot. Part three includes contributions based on Theory and Methodology of Multi-Criteria Decision-Aiding based on a general framework for conjoint measurement that allows intrasitive preferences. Denis Bouyssou & Marc Pirlot; Alexis Tsoukiàs, Patrice Perny & Philippe Vincke; Luis Dias & João Clímaco; Daniel Vanderpooten; Michael Doumpos & Constantin Zopounidis; and Marc Roubens offer a considerable range of examinations of this aspect of MCDA. Part four is devoted to Perference Modeling with contributions from Peter Fishburn; Salvatore Greco, Benedetto Matarazzo & Roman Slowinski; Salem Benferhat, Didier Dubois & Henri Prade; Oscar Franzese & Mark McCord; Bertrand Munier; and Raymond Bisdorff. Part five groups Applications of Multi-Criteria Decision-Aiding, and Carlos Henggeler Antunes, Carla Oliveira & João Clímaco; Carlos Bana e Costa, Manuel da Costa-Lobo, Isabel Ramos & Jean-Claude Vansnick; Yannis Siskos & Evangelos Grigoroudis; Jean-Pierre Brans, Pierre Kunsch & Bertrand Mareschal offer a wide variety of application problems. Finally, Part six includes contributions on Multi-Objective Mathematical Programming from Jacques Teghem, Walter Habenicht and Pekka Korhonen.

Download or read book Using OpenMP written by Barbara Chapman and published by MIT Press. This book was released on 2007-10-12 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive overview of OpenMP, the standard application programming interface for shared memory parallel computing—a reference for students and professionals. "I hope that readers will learn to use the full expressibility and power of OpenMP. This book should provide an excellent introduction to beginners, and the performance section should help those with some experience who want to push OpenMP to its limits." —from the foreword by David J. Kuck, Intel Fellow, Software and Solutions Group, and Director, Parallel and Distributed Solutions, Intel Corporation OpenMP, a portable programming interface for shared memory parallel computers, was adopted as an informal standard in 1997 by computer scientists who wanted a unified model on which to base programs for shared memory systems. OpenMP is now used by many software developers; it offers significant advantages over both hand-threading and MPI. Using OpenMP offers a comprehensive introduction to parallel programming concepts and a detailed overview of OpenMP. Using OpenMP discusses hardware developments, describes where OpenMP is applicable, and compares OpenMP to other programming interfaces for shared and distributed memory parallel architectures. It introduces the individual features of OpenMP, provides many source code examples that demonstrate the use and functionality of the language constructs, and offers tips on writing an efficient OpenMP program. It describes how to use OpenMP in full-scale applications to achieve high performance on large-scale architectures, discussing several case studies in detail, and offers in-depth troubleshooting advice. It explains how OpenMP is translated into explicitly multithreaded code, providing a valuable behind-the-scenes account of OpenMP program performance. Finally, Using OpenMP considers trends likely to influence OpenMP development, offering a glimpse of the possibilities of a future OpenMP 3.0 from the vantage point of the current OpenMP 2.5. With multicore computer use increasing, the need for a comprehensive introduction and overview of the standard interface is clear. Using OpenMP provides an essential reference not only for students at both undergraduate and graduate levels but also for professionals who intend to parallelize existing codes or develop new parallel programs for shared memory computer architectures.

Download or read book Multiple Criteria Decision Making in the New Millennium written by Murat Köksalan and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains a collection of papers presented at the 15th International Conference on Multiple Criteria Decision Making held in Ankara, Turkey July 10 14, 2000. This was one of the regular conferences of the International Society on Multiple Criteria Decision Making, which are held at approximately two-year intervals. The Ankara conference had 195 participants from 38 countries. A total of 185 papers were presented at the conference. The title of our volume is MCDM in the New Millennium. The papers presented at the conference reflect the theme. We had several papers on information technology (IT) and many application papers. Of the 81 application papers presented, 14 appear in the volume. We expect more IT applications of MCDM to appear in the future, in particular in the areas of e-commerce and the internet. The conference surroundings and accomodations were excellent, and conducive to both an outstanding academic exchange, and enjoyment and a cultural broadening of participants. We had a pleasant and enjoyable outing and visit to the Anatolian Civilizations Museum. We also had an outstanding banquet at which awards were presented. The MCDM Gold Medal was presented to Professor Thomas Saaty, of the University of Pittsburgh. The MCDM Presidential Service Award was presented to ProfessorPekka Korhonen of the Helsinki School of Economics for his years of presidential service to the society. The society presented the MCDM Edgeworth-Pareto Award to Professor Alexander V. Lotov of the Russian Academy of Sciences.

Download or read book Recent Advances in Integrated Design and Manufacturing in Mechanical Engineering written by Grigore Gogu and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents recent advances in the integration and the optimization of product design and manufacturing systems. The book is divided into 3 chapters corresponding to the following three main topics : - optimization of product design process (mechanical design process, mass customization, modeling the product representation, computer support for engineering design, support systems for tolerancing, simulation and optimization tools for structures and for mechanisms and robots), -optimization of manufacturing systems (multi-criteria optimization and fuzzy volumes, tooth path generation, machine-tools behavior, surface integrity and precision, process simulation), - methodological aspects of integrated design and manufacturing (solid modeling, collaborative tools and knowledge formalization, integrating product and process design and innovation, robust and reliable design, multi-agent approach in VR environment). The present book is of interest to engineers, researchers, academic staff, and postgraduate students interested in integrated design and manufacturing in mechanical engineering.

Download or read book Theory and Practice written by Jacques Derrida and published by University of Chicago Press. This book was released on 2019-01-31 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now in paperback, nine lectures from Jacques Derrida that challenge the influential Marxist distinction between thinking and acting. Theory and Practice is a series of nine lectures that Jacques Derrida delivered at the École Normale Supérieure in 1976 and 1977. The topic of “theory and practice” was associated above all with Marxist discourse and particularly the influential interpretation of Marx by Louis Althusser. Derrida’s many questions to Althusser and other thinkers aim at unsettling the distinction between thinking and acting. Derrida’s investigations set out from Marx’s “Theses on Feuerbach,” in particular the eleventh thesis, which has often been taken as a mantra for the “end of philosophy,” to be brought about by Marxist practice. Derrida argues, however, that Althusser has no such end in view and that his discourse remains resolutely philosophical, even as it promotes the theory/practice pair as primary values. This seminar also draws fascinating connections between Marxist thought and Heidegger and features Derrida’s signature reconsideration of the dichotomy between doing and thinking. This text, available for the first time in English, shows that Derrida was doing important work on Marx long before Specters of Marx. As with the other volumes in this series, it gives readers an unparalleled glimpse into Derrida’s thinking at its best—spontaneous, unpredictable, and groundbreaking.