Download or read book Variantes non standards de probl mes d optimisation combinatoire written by Pierre Le Bodic and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse est composée de deux parties, chacune portant sur un sous-domaine de l'optimisation combinatoire a priori distant de l'autre. Le premier thème de recherche abordé est la programmation biniveau stochastique. Se cachent derrière ce terme deux sujets de recherche relativement peu étudiés conjointement, à savoir d'un côté la programmation stochastique, et de l'autre la programmation biniveau. La programmation mathématique (PM) regroupe un ensemble de méthodes de modélisation et de résolution, pouvant être utilisées pour traiter des problèmes pratiques que se posent des décideurs. La programmation stochastique et la programmation biniveau sont deux sous-domaines de la PM, permettant chacun de modéliser un aspect particulier de ces problèmes pratiques. Nous élaborons un modèle mathématique issu d'un problème appliqué, où les aspects biniveau et stochastique sont tous deux sollicités, puis procédons à une série de transformations du modèle. Une méthode de résolution est proposée pour le PM résultant. Nous démontrons alors théoriquement et vérifions expérimentalement la convergence de cette méthode. Cet algorithme peut être utilisé pour résoudre d'autres programmes biniveaux que celui qui est proposé.Le second thème de recherche de cette thèse s'intitule "problèmes de coupe et de couverture partielles dans les graphes". Les problèmes de coupe et de couverture sont parmi les problèmes de graphe les plus étudiés du point de vue complexité et algorithmique. Nous considérons certains de ces problèmes dans une variante partielle, c'est-à-dire que la propriété de coupe ou de couverture dont il est question doit être vérifiée partiellement, selon un paramètre donné, et non plus complètement comme c'est le cas pour les problèmes originels. Précisément, les problèmes étudiés sont le problème de multicoupe partielle, de coupe multiterminale partielle, et de l'ensemble dominant partiel. Les versions sommets des ces problèmes sont également considérés. Notons que les problèmes en variante partielle généralisent les problèmes non partiels. Nous donnons des algorithmes exacts lorsque cela est possible, prouvons la NP-difficulté de certaines variantes, et fournissons des algorithmes approchés dans des cas assez généraux.

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 2003 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: De nombreux problèmes d'optimisation combinatoires NP-difficiles peuvent se formuler en utilisant le modèle général de la programmation mathématique en variables mixtes (PMVM). Les logiciels de programmation linéaire en variables mixtes et de programmation quadratique convexe en variables mixtes sont de plus en plus performants mais leur efficacité dépend fortement de la formulation retenue pour le problème considéré. Le but de cette de thèse est de montrer ce que peut apporter la PMVM à la résolution de problèmes d'optimisation combinatoire difficiles par rapport à des algorithmes spécialement conçus pour ces problèmes et d'essayer de dégager des idées générales pour obtenir de bonnes formulations. Nous avons ainsi choisi quatre problème de nature différente: trois dont la formulation naturelle est non linéaire avec des fonctions économiques de type min max, quadratique convexe ou hyperbolique et un problème dont la formulation naturelle est linéaire. Nous montrons que la résolution de ces quatre problèmes par des logiciels standards de programmation mathématique est une approche particulièrement efficace par rapport aux algorithmes spécifiques dont la mise en œuvre est souvent complexe.

Download or read book Approximation et r solution des versions min max et min max regret de probl mes d optimisation combinatoire written by Hassene Aissi and published by . This book was released on 2005 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: En théorie de la décision, des approches, basées sur la résolution des versions min-max (regret) de problèmes d’optimisation, sont souvent utilisées en vue d’obtenir des solutions qui ont un bon comportement dans le pire cas. La complexité de ces problèmes a été étudiée de manière approfondie au cours de la dernière décennie. Nous présentons certains résultats complémentaires de complexité et nous initions l’étude de l’approximation des versions min-max (regret) de plusieurs problèmes classiques tels que le plus court chemin, l’arbre couvrant et le sac à dos, pour lesquels nous présentons des résultats positifs et négatifs.Outre cette étude théorique, nous nous intéressons à une application du critère de regret maximum et, d’une manière générale, des approches robustes au problème d’association de données. Formellement, le problème peut se modéliser comme un problème d’affectation multidimensionnelle. Compte tenu des diverses sources d’imprécision, le modèle n’est pas souvent pertinent. Nous montrons qu’il est utile d’évaluer les coefficients de la fonction objectif à l’aide d’intervalles au lieu d’utiliser les valeurs les plus vraisemblables. Différentes stratégies sont étudiées pour résoudre ce problème et des exemples numériques sont proposés pour démontrer l’efficacité de notre approche.

Download or read book Optimisation Combinatoire Inverse Et Applications written by Yerim Chung and published by . This book was released on 2010 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'optimisation combinatoire inverse a suscité beaucoup d'attention de la communauté de la recherche opérationnelle pendant les deux dernières décennies. Étant donnée une instance d'un problème d'optimisation combinatoire définie par un système de paramètres (coûts, profits, etc.) et une solution réalisable, le problème inverse associé consiste à modifier au minimum les paramètres afin de rendre la solution fixée optimale dans l'instance modifiée. Dans le cadre de l'optimisation combinatoire, de nombreux problèmes inverses ont été étudiés, mais relativement peu d'études ont été menées sur des versions inverses de problèmes NP-difficiles. Dans cette thèse, nous considérons des problèmes combinatoires inverses généralisés. Nous commençons par imposer certaines contraintes aux paramètres à modifier. En particulier, des contraintes booléennes nous permettent de définir des versions inverses de problèmes non pondérés. Ainsi, des contraintes discrètes engendrent des problèmes combinatoires inverses eux-même combinatoires. Nous introduisons alors deux variantes de problèmes combinatoires inverses généralisés, à savoir "les problèmes inverses contre un algorithme spécifié" et "les problèmes inverses en valeur". Pour la première, un algorithme étant spécifié pour le problème d'origine, on cherche, pour une instance et une solution réalisable fixées, à modifier le moins possible l'instance pour que cette solution puisse être choisie par l'algorithme. Un problème inverse en valeur quant à lui est défini en spécifiant une valeur à atteindre au lieu d'une solution cible. L'objectif est de modifier le moins possible l'instance considerée de sorte que la valeur optimale de l'instance modifiée soit égale à la valeur fixée. Nous étudions différentes versions inverses de problèmes NP-difficiles. Les problèmes abordés sont le stable maximum d'un graphe (ensemble maximum de sommets 2 à 2 non adjacents), le voyageur de commerce minimum et la coloration minimum des sommets d'un graphe. Notre principal objectif est d'étudier la complexité et l'approximabilité de ces problèmes.

Download or read book The Traveling Salesman Problem written by D.B. Shmoys and published by John Wiley & Sons, Incorporated. This book was released on 1985 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Traveling Salesman Problem is central to the area of Combinatorial Optimization, and it is through this problem that many of the most important developments in the area have been made. This book focuses on essential ideas; through them it illustrates all the concepts and techniques of combinatorial optimization concisely but comprehensively. The extensive reference list and numerous exercises direct the reader towards related fields, and give results. Each of the twelve chapters in this volume is concerned with a specific aspect of the Traveling Salesman Problem, and is written by an authority on that aspect. It is hoped, that the book will serve as a state-of-the-art survey of the Traveling Salesman problem which will encourage further investigations, and that it will also be useful for its comprehensive coverage of the techniques of combinatorial optimization.

Download or read book Primal dual Interior Point Methods written by Stephen J. Wright and published by SIAM. This book was released on 1997-01-01 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past decade, primal-dual algorithms have emerged as the most important and useful algorithms from the interior-point class. This book presents the major primal-dual algorithms for linear programming in straightforward terms. A thorough description of the theoretical properties of these methods is given, as are a discussion of practical and computational aspects and a summary of current software. This is an excellent, timely, and well-written work. The major primal-dual algorithms covered in this book are path-following algorithms (short- and long-step, predictor-corrector), potential-reduction algorithms, and infeasible-interior-point algorithms. A unified treatment of superlinear convergence, finite termination, and detection of infeasible problems is presented. Issues relevant to practical implementation are also discussed, including sparse linear algebra and a complete specification of Mehrotra's predictor-corrector algorithm. Also treated are extensions of primal-dual algorithms to more general problems such as monotone complementarity, semidefinite programming, and general convex programming problems.

Download or read book Selected Areas in Cryptography SAC 2018 written by Carlos Cid and published by Springer. This book was released on 2019-01-12 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains revised selected papers from the 25th International Conference on Selected Areas in Cryptography, SAC 2018, held in Calgary, AB, Canada in August 2018. The 22 full papers presented in this volume were carefully reviewed and selected from 57 submissions. They cover the following research areas: design and analysis of symmetric key primitives and cryptosystems, including block and stream ciphers, hash functions, MAC algorithms, and authenticated encryption schemes efficient implementations of symmetric and public key algorithms mathematical and algorithmic aspects of applied cryptology cryptography for the Internet of Things

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.

Download or read book Product Life Cycle Management written by Max Giordano and published by John Wiley & Sons. This book was released on 2012-12-17 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a comprehensive view of the most recent major international research in the field of tolerancing, and is an excellent resource for anyone interested in Computer Aided Tolerating. It is organized into 4 parts. Part 1 focuses on the more general problems of tolerance analysis and synthesis, for tolerancing in mechanical design and manufacturing processes. Part 2 specifically highlights the simulation of assembly with defects, and the influence of tolerances on the quality of the assembly. Part 3 deals with measurement aspects, and quality control throughout the life cycle. Different measurement technologies and methods for estimating uncertainty are considered. In Part 4, different aspects of tolerancing and their interactions are explored, from the definition of functional requirement to measurement processes in a PLM approach.

Download or read book Nonlinear Programming written by Anthony V. Fiacco and published by SIAM. This book was released on 1990-01-01 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent interest in interior point methods generated by Karmarkar's Projective Scaling Algorithm has created a new demand for this book because the methods that have followed from Karmarkar's bear a close resemblance to those described. There is no other source for the theoretical background of the logarithmic barrier function and other classical penalty functions. Analyzes in detail the "central" or "dual" trajectory used by modern path following and primal/dual methods for convex and general linear programming. As researchers begin to extend these methods to convex and general nonlinear programming problems, this book will become indispensable to them.

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 Applications of Stochastic Programming written by Stein W. Wallace and published by SIAM. This book was released on 2005-01-01 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: Consisting of two parts, this book presents papers describing publicly available stochastic programming systems that are operational. It presents a diverse collection of application papers in areas such as production, supply chain and scheduling, gaming, environmental and pollution control, financial modeling, telecommunications, and electricity.

Download or read book The Development of the Number Field Sieve written by Arjen K. Lenstra and published by Springer. This book was released on 2006-11-15 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: The number field sieve is an algorithm for finding the prime factors of large integers. It depends on algebraic number theory. Proposed by John Pollard in 1988, the method was used in 1990 to factor the ninth Fermat number, a 155-digit integer. The algorithm is most suited to numbers of a special form, but there is a promising variant that applies in general. This volume contains six research papers that describe the operation of the number field sieve, from both theoretical and practical perspectives. Pollard's original manuscript is included. In addition, there is an annotated bibliography of directly related literature.

Download or read book Evidence Synthesis for Decision Making in Healthcare written by Nicky J. Welton and published by John Wiley & Sons. This book was released on 2012-04-12 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the evaluation of healthcare, rigorous methods of quantitative assessment are necessary to establish interventions that are both effective and cost-effective. Usually a single study will not fully address these issues and it is desirable to synthesize evidence from multiple sources. This book aims to provide a practical guide to evidence synthesis for the purpose of decision making, starting with a simple single parameter model, where all studies estimate the same quantity (pairwise meta-analysis) and progressing to more complex multi-parameter structures (including meta-regression, mixed treatment comparisons, Markov models of disease progression, and epidemiology models). A comprehensive, coherent framework is adopted and estimated using Bayesian methods. Key features: A coherent approach to evidence synthesis from multiple sources. Focus is given to Bayesian methods for evidence synthesis that can be integrated within cost-effectiveness analyses in a probabilistic framework using Markov Chain Monte Carlo simulation. Provides methods to statistically combine evidence from a range of evidence structures. Emphasizes the importance of model critique and checking for evidence consistency. Presents numerous worked examples, exercises and solutions drawn from a variety of medical disciplines throughout the book. WinBUGS code is provided for all examples. Evidence Synthesis for Decision Making in Healthcare is intended for health economists, decision modelers, statisticians and others involved in evidence synthesis, health technology assessment, and economic evaluation of health technologies.

Download or read book Graph Colouring and the Probabilistic Method written by Michael Molloy and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decade, many major advances have been made in the field of graph coloring via the probabilistic method. This monograph, by two of the best on the topic, provides an accessible and unified treatment of these results, using tools such as the Lovasz Local Lemma and Talagrand's concentration inequality.

Download or read book Graphics Recognition Algorithms and Applications written by Dorothea Blostein and published by Springer. This book was released on 2014-10-08 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents refereed and revised papers presented at GREC 2001, the 4th IAPR International Workshop on Graphics Recognition, which took place in Kingston, Ontario, Canada in September 2001. Graphics recognition is a branch of document image analysis that focuses on the recognition of two-dimensional notations such as engineering drawings, maps, mathematical notation, music notation, tables, and chemical structure diagrams. Due to the growing demand for both o?-line and on-line document recognition systems, the ?eld of graphics recognition has an excitingand promisingfuture. The GREC workshops provide an opportunity for researchers at all levels of experience to share insights into graphics recognition methods. The workshops enjoy strongparticipation from researchers in both industry and academia. They are sponsored by IAPR TC-10, the Technical Committee on Graphics Recog- tion within the International Association for Pattern Recognition. Edited v- umes from the previous three workshops in this series are available as Lecture Notes in Computer Science, Vols. 1072, 1389, and 1941. After the GREC 2001 workshop, authors were invited to submit enhanced versions of their papers for review. Every paper was evaluated by three reviewers. We are grateful to both authors and reviewers for their careful work during this review process. Many of the papers that appear in this volume were thoroughly revised and improved, in response to reviewers’ suggestions.

Download or read book Graphics Recognition written by Young-Bin Kwon and published by Springer. This book was released on 2013-02-10 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the thoroughly refereed post-conference proceedings of the 9th International Workshop on Graphics Recognition (GREC 2011), held in Seoul, Korea, September 15-16, 2011. The 25 revised full papers presented were carefully selected from numerous submissions. Graphics recognition is a subfield of document image analysis that deals with graphical entities in engineering drawings, sketches, maps, architectural plans, musical scores, mathematical notation, tables, and diagrams. Accordingly the conference papers are organized in 5 technical sessions, covering the topics such as map and ancient documents, symbol and logo recognition, sketch and drawings, performance evaluation and challenge processing.