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 Parallel Processing and Applied Mathematics written by Roman Wyrzykowski and published by Springer. This book was released on 2012-07-03 with total page 789 pages. Available in PDF, EPUB and Kindle. Book excerpt: This two-volume-set (LNCS 7203 and 7204) constitutes the refereed proceedings of the 9th International Conference on Parallel Processing and Applied Mathematics, PPAM 2011, held in Torun, Poland, in September 2011. The 130 revised full papers presented in both volumes were carefully reviewed and selected from numerous submissions. The papers address issues such as parallel/distributed architectures and mobile computing; numerical algorithms and parallel numerics; parallel non-numerical algorithms; tools and environments for parallel/distributed/grid computing; applications of parallel/distributed computing; applied mathematics, neural networks and evolutionary computing; history of computing.
Download or read book M thodes D Optimisation Combinatoire Sur Grilles de Calcul written by Mohand Mezmaz and published by Omniscriptum. This book was released on 2010-10 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: La résolution exacte de problèmes d'optimisation combinatoire de grande taille constitue un vrai défi pour les grilles informatiques. En effet, il est nécessaire de repenser les algorithmes de résolution pour prendre en compte les caracteristiques 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 de calcul des méthodes exactes de type Branch-and-Bound appelée B&B@Grid. Cette approche est basée sur un codage des unités de travail (sous-problèmes) sous forme d'intervalles permettant de minimiser le coût des communications induites par les opérations de régulationde charge, de tolérance aux pannes et de détection de la terminaison. Cette approche, environ 100 fois plus performante en termes de coût de communication que la meilleure approche connue, a permis la résolution optimale sur la grillenationale Grid5000 d'une instance standard du problème du Flow-Shop restée non résolue depuis une quinzaine d'années.
Download or read book R solution exacte d un probl me d optimisation combinatoire NP difficile sur grilles de calcul written by Abdelaziz Djerrah and published by . This book was released on 2006 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ces dernières années, de nombreuses avancées dans la résolution exacte de problèmes d'optimisation difficiles ont été enregistrées. Le premier facteur de ces succès est le développement de nouvelles techniques de calcul de bornes inférieures pour ces problèmes et le deuxième facteur est sans aucun doute la progression de la puissance de calcul des machines parallèles en utilisant des grilles de calcul.Le QAP est l'un des problèmes d'Optimisation Combinatoire les plus difficiles.Bien qu'il soit ancien, ce problème suscite encore aujourd'hui beaucoup d'intérêt. A cela, deux raison principales: d'une part, beaucoup de problèmes du monde industriel sont modélisés par cette application; d'autre part, de nombreux autres problèmes d'Optimisation Combinatoire, comme le problème du voyageur de commerce (TSP), ou encore des problèmes de la théorie de graphe tel le problème de clique maximal et problème de partitionnement de graphe s'expriment comme des cas particuliers du QAP.Le travail présenté dans ce mémoire porte sur l'étude de la parallélisation de la méthode Branch-and-Bound. Le modèle de parallélisation est implémenté dans la librairie d'aide à la programmation Bob++ et un algorithme Branch-and-Bound parallèle est proposée pour le QAP. L'algorithme, basé sur une nouvelle technique de cacul de borne inférieur, est développé pour s'exécuter, avec un minimum de changements, sur une large gamme de machines séquentielles et/ou parallèles y compris les larges systèmes distribués comme les grilles de calcul. Les résultats obtenus montrent l'efficacité et extensibilité de l'algorithme
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 Large Scale Network Centric Distributed Systems written by Hamid Sarbazi-Azad and published by John Wiley & Sons. This book was released on 2013-10-10 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: A highly accessible reference offering a broad range of topics and insights on large scale network-centric distributed systems Evolving from the fields of high-performance computing and networking, large scale network-centric distributed systems continues to grow as one of the most important topics in computing and communication and many interdisciplinary areas. Dealing with both wired and wireless networks, this book focuses on the design and performance issues of such systems. Large Scale Network-Centric Distributed Systems provides in-depth coverage ranging from ground-level hardware issues (such as buffer organization, router delay, and flow control) to the high-level issues immediately concerning application or system users (including parallel programming, middleware, and OS support for such computing systems). Arranged in five parts, it explains and analyzes complex topics to an unprecedented degree: Part 1: Multicore and Many-Core (Mc) Systems-on-Chip Part 2: Pervasive/Ubiquitous Computing and Peer-to-Peer Systems Part 3: Wireless/Mobile Networks Part 4: Grid and Cloud Computing Part 5: Other Topics Related to Network-Centric Computing and Its Applications Large Scale Network-Centric Distributed Systems is an incredibly useful resource for practitioners, postgraduate students, postdocs, and researchers.
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 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 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 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 Handbook on Semidefinite Conic and Polynomial Optimization written by Miguel F. Anjos and published by Springer Science & Business Media. This book was released on 2011-11-19 with total page 955 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semidefinite and conic optimization is a major and thriving research area within the optimization community. Although semidefinite optimization has been studied (under different names) since at least the 1940s, its importance grew immensely during the 1990s after polynomial-time interior-point methods for linear optimization were extended to solve semidefinite optimization problems. Since the beginning of the 21st century, not only has research into semidefinite and conic optimization continued unabated, but also a fruitful interaction has developed with algebraic geometry through the close connections between semidefinite matrices and polynomial optimization. This has brought about important new results and led to an even higher level of research activity. This Handbook on Semidefinite, Conic and Polynomial Optimization provides the reader with a snapshot of the state-of-the-art in the growing and mutually enriching areas of semidefinite optimization, conic optimization, and polynomial optimization. It contains a compendium of the recent research activity that has taken place in these thrilling areas, and will appeal to doctoral students, young graduates, and experienced researchers alike. The Handbook’s thirty-one chapters are organized into four parts: Theory, covering significant theoretical developments as well as the interactions between conic optimization and polynomial optimization; Algorithms, documenting the directions of current algorithmic development; Software, providing an overview of the state-of-the-art; Applications, dealing with the application areas where semidefinite and conic optimization has made a significant impact in recent years.
Download or read book Integrated Project Management and Control written by Mario Vanhoucke and published by Springer. This book was released on 2014-07-08 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents an integrated approach to monitoring projects in progress using Earned Value and Earned Schedule Management combined with Schedule Risk Analysis. Monitoring and controlling projects involves processes for identifying potential problems in a timely manner. When necessary, corrective actions can be taken to exploit project opportunities or to get faltering projects back on track. The prerequisite is that project performance is observed and measured regularly to identify variances from the project baseline schedule. Therefore, monitoring the performance of projects in progress requires a set of tools and techniques that should ideally be combined into a single integrated system. The book offers a valuable resource for anyone who wants to understand the theory first and then to use it in practice with software tools. It is intended for students, professionals and academics with an interest and/or experience in running projects as well as for newcomers in the area of project control with a basic grasp of the Earned Value, Earned Schedule and Schedule Risk Analysis concepts.
Download or read book CIKM 13 written by CIKM 13 Conference Committee and published by . This book was released on 2013-10-27 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt: CIKM'13: 22nd ACM International Conference on Information and Knowledge Management Oct 27, 2013-Nov 01, 2013 San Francisco, USA. You can view more information about this proceeding and all of ACM�s other published conference proceedings from the ACM Digital Library: http://www.acm.org/dl.
Download or read book Geometric Properties of Banach Spaces and Nonlinear Iterations written by Charles Chidume and published by Springer Science & Business Media. This book was released on 2009-03-27 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contents of this monograph fall within the general area of nonlinear functional analysis and applications. We focus on an important topic within this area: geometric properties of Banach spaces and nonlinear iterations, a topic of intensive research e?orts, especially within the past 30 years, or so. In this theory, some geometric properties of Banach spaces play a crucial role. In the ?rst part of the monograph, we expose these geometric properties most of which are well known. As is well known, among all in?nite dim- sional Banach spaces, Hilbert spaces have the nicest geometric properties. The availability of the inner product, the fact that the proximity map or nearest point map of a real Hilbert space H onto a closed convex subset K of H is Lipschitzian with constant 1, and the following two identities 2 2 2 ||x+y|| =||x|| +2 x,y +||y|| , (?) 2 2 2 2 ||?x+(1??)y|| = ?||x|| +(1??)||y|| ??(1??)||x?y|| , (??) which hold for all x,y? H, are some of the geometric properties that char- terize inner product spaces and also make certain problems posed in Hilbert spaces more manageable than those in general Banach spaces. However, as has been rightly observed by M. Hazewinkel, “... many, and probably most, mathematical objects and models do not naturally live in Hilbert spaces”. Consequently,toextendsomeoftheHilbertspacetechniquestomoregeneral Banach spaces, analogues of the identities (?) and (??) have to be developed.
Download or read book Particle Modeling written by Donald Greenspan and published by Springer Science & Business Media. This book was released on 1997-09-23 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: A reference for the field of particle modelling - the study of dynamical behaviour of solids and fluids in response to external forces, with the solids and fluids modelled as systems of atoms and molecules.
Download or read book Biomimicry written by Janine M. Benyus and published by Harper Collins. This book was released on 2009-08-11 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Repackaged with a new afterword, this "valuable and entertaining" (New York Times Book Review) book explores how scientists are adapting nature's best ideas to solve tough 21st century problems. Biomimicry is rapidly transforming life on earth. Biomimics study nature's most successful ideas over the past 3.5 million years, and adapt them for human use. The results are revolutionizing how materials are invented and how we compute, heal ourselves, repair the environment, and feed the world. Janine Benyus takes readers into the lab and in the field with maverick thinkers as they: discover miracle drugs by watching what chimps eat when they're sick; learn how to create by watching spiders weave fibers; harness energy by examining how a leaf converts sunlight into fuel in trillionths of a second; and many more examples. Composed of stories of vision and invention, personalities and pipe dreams, Biomimicry is must reading for anyone interested in the shape of our future.
