Download or read book Architecture multiprocesseur dediee a la resolution des equations derivees partielles en 3D written by Jean-Marc Libs and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Architecture multiprocesseur d di e la r solution des quations aux d riv es partielles en 3D written by Jean-Marc Libs and published by . This book was released on 1994 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE ETUDE CONSISTAIT A POSER LES PRINCIPES D'UNE ARCHITECTURE MULTIPROCESSEUR DEDIEE A UNE FONCTION SPECIFIQUE: LA RESOLUTION DES SYSTEMES D'EQUATIONS AUX DERIVEES PARTIELLES EN 3D. NOUS VISONS UN GAIN DE TEMPS GRACE AU PARALLELISME ET AUX RESTRICTIONS DU DOMAINE D'APPLICATION DU SYSTEME. L'ASPECT NUMERIQUE REPOSE SUR UNE METHODE ITERATIVE DE GAUSS-SEIDEL RELAXEE, APPLIQUEE A UNE DISCRETISATION DE TYPE VOLUMES FINIS SUR UN MAILLAGE ADAPTATIF ENTRELACE. CES CHOIX ONT ETE FAITS AVEC L'IDEE D'UNE APPROCHE MULTIPROCESSEUR, POUR OPTIMISER LES GAINS DU PARALLELISME ET LIMITER LES CONTRAINTES DE CELUI-CI. NOUS AVONS ADOPTE UN PARALLELISATION PAR DECOMPOSITION SPATIALE DU DOMAINE SELON UNE GRILLE 3D, CE QUI LIMITE A SIX LE MAXIMUM DE LIAISONS PAR MODULE. IL EST ESSENTIEL DE RECOUVRIR LES TRANSFERTS DE DONNEES PAR LES CALCULS. UNE SIMULATION SUR MACHINE SEQUENTIELLE A MONTRE QUE LES PARAMETRES IMPORTANTS A PRENDRE EN COMPTE LORS DE LA PARALLELISATION DE CES EQUATIONS SONT L'ORDRE DE PARCOURS DES POINTS DU VOLUME ETUDIE, LE NOMBRE DE POINTS ELEMENTAIRES PAR SOUS-DOMAINE, LA COMMUNICATION ENTRE LES DIFFERENTS PROCESSEURS. NOUS AVONS AINSI DEFINI ET TESTE UN ALGORITHME ORIGINAL DE PARCOURS DES POINTS PERMETTANT A LA FOIS DE MIEUX MASQUER LES TRANSFERTS DE DONNEES ET D'OPTIMISER UN FONCTIONNEMENT EN PIPELINE. CE TRAVAIL DE THESE CONSTITUE LA BASE DE TRAVAUX EN COURS AU LABORATOIRE, DONT LES PERSPECTIVES SONT LA REALISATION D'UN SYSTEME A 16 PROCESSEURS QUI CONSERVERA DANS CHACUN DES MODULES L'ARCHITECTURE ET LES ALGORITHMES DEFINIS DANS CETTE ETUDE
Download or read book tude expression et valuation du parall lisme dans la r solution d quations aux d riv es partielles sur une architecture multiprocesseur m moires locales written by Philippe Berger and published by . This book was released on 1982 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contribution l tude d une architecture parall le d di e la r solution des syst mes d quations aux d riv es partielles en trois dimensions written by Jean Durupt and published by . This book was released on 1996 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL SE SITUE DANS LE CADRE D'UN PROJET VISANT A REALISER UN SYSTEME ELECTRONIQUE DESTINE A LA RESOLUTION PARALLELE DE SYSTEMES D'EQUATIONS AUX DERIVEES PARTIELLES EN TROIS DIMENSIONS. COMME IL EST PREVU DE RESOUDRE DE NOMBREUX TYPES DE SYSTEMES D'EQUATIONS, LA METHODE DE RESOLUTION NUMERIQUE DOIT ETRE LA PLUS STABLE POSSIBLE. POUR CELA, NOUS AVONS CHOISI LA METHODE DE GAUSS-SEIDEL RELAXEE. LA METHODE DE RESOLUTION EMPLOYEE IMPLIQUE UNE DISCRETISATION DU DOMAINE ETUDIE PAR LA METHODE DES VOLUMES FINIS OU DES DIFFERENCES FINIES, DE FACON A AVOIR UNE STRUCTURE REGULIERE DES DONNEES A TRAITER PAR LE SYSTEME. POUR SIMPLIFIER LE TRAVAIL DU PROCESSEUR, NOUS AVONS CONCU UN CIRCUIT ASIC QUI ASSURE LA GESTION DES DONNEES PENDANT LES CALCULS. CE CIRCUIT A ETE DECRIT EN LANGAGE VHDL ET DESSINE AVEC LE LOGICIEL SOLO1400. NOUS TESTONS CE CIRCUIT PAR ANALYSE DE SIGNATURE AVEC DES MISR (MULTIPLE INPUT SHIFT REGISTER). NOUS DONNONS UNE ESTIMATION DU TAUX DE COUVERTURE DE CETTE METHODE ET DE LA PROBABILITE D'ALIAS DE LA SIGNATURE OBTENUE
Download or read book Etude de la r solution des quations aux d riv es partielles en 3D sur des machines parall les written by Bernard Siaud and published by . This book was released on 1995 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Une étude comparative de différentes machines parallèles a été réalisée à partir d'un algorithme type résolvant un systeme d'équations aux dérivées partielles (EDPs). Ce travail nous a permis d'évaluer l'influence du parallèlisme sur les temps de calcul et de communication interprocesseur. Au vu des résultats, nous avons pu définir, de facon plus précise, le cahier des charges de la machine HA3D dediée à la résolution des EDPs. Des algorithmes simples ont été développés pour améliorer la convergence de la méthode de gauss-seidel (diminuer le nombre de calculs) : approximation par maillages grossiers (AMG), variation du coefficient de sousrelaxation (VCS). La première methode consiste a initialiser les valeurs des variables (grandeurs physiques à dèterminer) par un calcul sur des maillages plus grossiers du domaine d'ètude, discretise par les mèthodes des volumes finis ou des diffèrences finies. La méthode VCS est utilisée lors de la remise à jour des coefficients pour tenir compte de la dependance des variables. Pour tester des machines paralleles, nous avons utilise une methode originale de mesure de performances. Les résultats ont montré que dans le cas de la machine paragon, la plus récente, les calculs recouvrent presque totalement les communications. Par conséquent, seule la déterioration de l'algorithme limitait le speed-up. Nous avons également vérifié que l'efficacité du systême d'exploitation (pour une machine donnée) était un point important pour les communications interprocesseurs.
Download or read book DEFINITION D UN PROCESSEUR SPECIALISE A BASE D ARCHITECTURES SYSTOLIQUES POUR LA RESOLUTION D EQUATIONS AUX DERIVEES PARTIELLES PAR LA METHODE DES ELEMENTS FINIS written by EMMANUEL.. CASSEAU and published by . This book was released on 1994 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA METHODE DES ELEMENTS FINIS EST UNE TECHNIQUE DE RESOLUTION NUMERIQUE D'EQUATIONS AUX DERIVEES PARTIELLES QUI PERMET DE DETERMINER UNE VALEUR APPROCHEE DU CHAMP RECHERCHE EN DIVERS POINTS D'UN DOMAINE DE DEFINITION. CETTE METHODE POLYVALENTE ET RAREMENT UTILISEE DANS DE NOMBREUX DOMAINES DE LA PHYSIQUE PRESENTE TOUTEFOIS UN INCONVENIENT MAJEUR LORS DE SON APPLICATION. EN EFFET, ELLE NECESSITE UN SUPPORT DE CALCUL TRES PERFORMANT. LA SOLUTION PROPOSEE DANS CETTE THESE, POUR PALLIER CET INCONVENIENT, CONSISTE EN L'UTILISATION D'UNE MACHINE SPECIALISEE METTANT EN UVRE DES ARCHITECTURES PARALLELES DU TYPE RESEAUX SYSTOLIQUES. LA CLASSE DE PROBLEMES PHYSIQUES CONSIDERES DANS L'ETUDE EST CARACTERISEE PAR DES PROBLEMES AUX LIMITES, LINEAIRES ET STATIONNAIRES. APRES UNE PRESENTATION DU PROCESSUS ALGORITHMIQUE DE LA METHODE DES ELEMENTS FINIS NOUS PROPOSONS UNE SOLUTION ARCHITECTURALE POUR DEUX PHASES DE TRAITEMENT DE LA METHODE QUI SE REVELENT PARTICULIEREMENT INTERESSANTES A CONSIDERER: LA DETERMINATION DES CONTRIBUTIONS ELEMENTAIRES ET LA RESOLUTION DU SYSTEME LINEAIRE PAR LES METHODES DIRECTES DE DECOMPOSITION LU ET LDL#T. ENFIN, L'ETUDE D'UN SYSTEME DE RESOLUTION PAR ELEMENTS FINIS BASE SUR LE PRINCIPE DE LA METHODE FRONTALE EST CONSIDEREE
Download or read book Parallel Computing written by Roman Trobec and published by Springer Science & Business Media. This book was released on 2009-06-18 with total page 531 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of parallel programming and architectures is essential for simulating and solving problems in modern computational practice. There has been rapid progress in microprocessor architecture, interconnection technology and software devel- ment, which are in?uencing directly the rapid growth of parallel and distributed computing. However, in order to make these bene?ts usable in practice, this dev- opment must be accompanied by progress in the design, analysis and application aspects of parallel algorithms. In particular, new approaches from parallel num- ics are important for solving complex computational problems on parallel and/or distributed systems. The contributions to this book are focused on topics most concerned in the trends of today’s parallel computing. These range from parallel algorithmics, progr- ming, tools, network computing to future parallel computing. Particular attention is paid to parallel numerics: linear algebra, differential equations, numerical integ- tion, number theory and their applications in computer simulations, which together form the kernel of the monograph. We expect that the book will be of interest to scientists working on parallel computing, doctoral students, teachers, engineers and mathematicians dealing with numerical applications and computer simulations of natural phenomena.
Download or read book Symmetric Galerkin Boundary Element Method written by Alok Sutradhar and published by Springer Science & Business Media. This book was released on 2008-09-26 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Symmetric Galerkin Boundary Element Method presents an introduction as well as recent developments of this accurate, powerful, and versatile method. The formulation possesses the attractive feature of producing a symmetric coefficient matrix. In addition, the Galerkin approximation allows standard continuous elements to be used for evaluation of hypersingular integrals. FEATURES • Written in a form suitable for a graduate level textbook as well as a self-learning tutorial in the field. • Covers applications in two-dimensional and three-dimensional problems of potential theory and elasticity. Additional basic topics involve axisymmetry, multi-zone and interface formulations. More advanced topics include fluid flow (wave breaking over a sloping beach), non-homogeneous media, functionally graded materials (FGMs), anisotropic elasticity, error estimation, adaptivity, and fracture mechanics. • Presents integral equations as a basis for the formulation of general symmetric Galerkin boundary element methods and their corresponding numerical implementation. • Designed to convey effective unified procedures for the treatment of singular and hypersingular integrals that naturally arise in the method. Symbolic codes using Maple® for singular-type integrations are provided and discussed in detail. • The user-friendly adaptive computer code BEAN (Boundary Element ANalysis), fully written in Matlab®, is available as a companion to the text. The complete source code, including the graphical user-interface (GUI), can be downloaded from the web site http://www.ghpaulino.com/SGBEM_book. The source code can be used as the basis for building new applications, and should also function as an effective teaching tool. To facilitate the use of BEAN, a video tutorial and a library of practical examples are provided.
Download or read book Signal Processing for Communications written by Paolo Prandoni and published by Collection Savoir suisse. This book was released on 2008-06-17 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: With a novel, less classical approach to the subject, the authors have written a book with the conviction that signal processing should be taught to be fun. The treatment is therefore less focused on the mathematics and more on the conceptual aspects, the idea being to allow the readers to think about the subject at a higher conceptual level, thus building the foundations for more advanced topics. The book remains an engineering text, with the goal of helping students solve real-world problems. In this vein, the last chapter pulls together the individual topics as discussed throughout the book into an in-depth look at the development of an end-to-end communication system, namely, a modem for communicating digital information over an analog channel.
Download or read book Applied Reactor Physics written by Alain Hébert and published by Presses inter Polytechnique. This book was released on 2009 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Physics of Information Technology written by Neil Gershenfeld and published by Cambridge University Press. This book was released on 2000-10-16 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Physics of Information Technology explores the familiar devices that we use to collect, transform, transmit, and interact with electronic information. Many such devices operate surprisingly close to very many fundamental physical limits. Understanding how such devices work, and how they can (and cannot) be improved, requires deep insight into the character of physical law as well as engineering practice. The book starts with an introduction to units, forces, and the probabilistic foundations of noise and signalling, then progresses through the electromagnetics of wired and wireless communications, and the quantum mechanics of electronic, optical, and magnetic materials, to discussions of mechanisms for computation, storage, sensing, and display. This self-contained volume will help both physical scientists and computer scientists see beyond the conventional division between hardware and software to understand the implications of physical theory for information manipulation.
Download or read book A Short Introduction to Quantum Information and Quantum Computation written by Michel Le Bellac and published by Cambridge University Press. This book was released on 2006-06-15 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum information and computation is a rapidly expanding and cross-disciplinary subject. This book, first published in 2006, gives a self-contained introduction to the field for physicists, mathematicians and computer scientists who want to know more about this exciting subject. After a step-by-step introduction to the quantum bit (qubit) and its main properties, the author presents the necessary background in quantum mechanics. The core of the subject, quantum computation, is illustrated by a detailed treatment of three quantum algorithms: Deutsch, Grover and Shor. The final chapters are devoted to the physical implementation of quantum computers, including the most recent aspects, such as superconducting qubits and quantum dots, and to a short account of quantum information. Written at a level suitable for undergraduates in physical sciences, no previous knowledge of quantum mechanics is assumed, and only elementary notions of physics are required. The book includes many short exercises, with solutions available to instructors through [email protected].
Download or read book Transport Theory written by James J. Duderstadt and published by John Wiley & Sons. This book was released on 1979 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: Problems after each chapter
Download or read book Foundations of Signal Processing written by Martin Vetterli and published by Cambridge University Press. This book was released on 2014-09-04 with total page 745 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive and engaging textbook introduces the basic principles and techniques of signal processing, from the fundamental ideas of signals and systems theory to real-world applications. Students are introduced to the powerful foundations of modern signal processing, including the basic geometry of Hilbert space, the mathematics of Fourier transforms, and essentials of sampling, interpolation, approximation and compression The authors discuss real-world issues and hurdles to using these tools, and ways of adapting them to overcome problems of finiteness and localization, the limitations of uncertainty, and computational costs. It includes over 160 homework problems and over 220 worked examples, specifically designed to test and expand students' understanding of the fundamentals of signal processing, and is accompanied by extensive online materials designed to aid learning, including Mathematica® resources and interactive demonstrations.
Download or read book Principles of Digital Communication written by Bixio Rimoldi and published by Cambridge University Press. This book was released on 2016-01-21 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive text that takes a unique top-down approach to teaching the fundamentals of digital communication for a one-semester course.
Download or read book Nuclear Computational Science written by Yousry Azmy and published by Springer Science & Business Media. This book was released on 2010-04-15 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nuclear engineering has undergone extensive progress over the years. In the past century, colossal developments have been made and with specific reference to the mathematical theory and computational science underlying this discipline, advances in areas such as high-order discretization methods, Krylov Methods and Iteration Acceleration have steadily grown. Nuclear Computational Science: A Century in Review addresses these topics and many more; topics which hold special ties to the first half of the century, and topics focused around the unique combination of nuclear engineering, computational science and mathematical theory. Comprising eight chapters, Nuclear Computational Science: A Century in Review incorporates a number of carefully selected issues representing a variety of problems, providing the reader with a wealth of information in both a clear and concise manner. The comprehensive nature of the coverage and the stature of the contributing authors combine to make this a unique landmark publication. Targeting the medium to advanced level academic, this book will appeal to researchers and students with an interest in the progression of mathematical theory and its application to nuclear computational science.
Download or read book The Physics of Nuclear Reactors written by Serge Marguet and published by Springer. This book was released on 2018-02-26 with total page 1462 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive volume offers readers a progressive and highly detailed introduction to the complex behavior of neutrons in general, and in the context of nuclear power generation. A compendium and handbook for nuclear engineers, a source of teaching material for academic lecturers as well as a graduate text for advanced students and other non-experts wishing to enter this field, it is based on the author’s teaching and research experience and his recognized expertise in nuclear safety. After recapping a number of points in nuclear physics, placing the theoretical notions in their historical context, the book successively reveals the latest quantitative theories concerning: • The slowing-down of neutrons in matter • The charged particles and electromagnetic rays • The calculation scheme, especially the simplification hypothesis • The concept of criticality based on chain reactions • The theory of homogeneous and heterogeneous reactors • The problem of self-shielding • The theory of the nuclear reflector, a subject largely ignored in literature • The computational methods in transport and diffusion theories Complemented by more than 400 bibliographical references, some of which are commented and annotated, and augmented by an appendix on the history of reactor physics at EDF (Electricité De France), this book is the most comprehensive and up-to-date introduction to and reference resource in neutronics and reactor theory.
