Download or read book Optimisation du traitement des requ tes dans un environnement de bases de donn es distribu es written by Iratni Rezki and published by . This book was released on 1990 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimisation de requ tes sur des donn es massives dans un environnement distribu written by Noel Gillet and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les systèmes de stockage distribués sont massivement utilisés dans le contexte actuel des grandes masses de données. En plus de gérer le stockage de ces données, ces systèmes doivent répondre à une quantité toujours plus importante de requêtes émises par des clients distants afin d'effectuer de la fouille de données ou encore de la visualisation. Une problématique majeure dans ce contexte consiste à répartir efficacement les requêtes entre les différents noeuds qui composent ces systèmes afin de minimiser le temps de traitement des requêtes ( temps maximum et en moyenne d'une requête, temps total de traitement pour toutes les requêtes...). Dans cette thèse nous nous intéressons au problème d'allocation de requêtes dans un environnement distribué. On considère que les données sont répliquées et que les requêtes sont traitées par les noeuds stockant une copie de la donnée concernée. Dans un premier temps, des solutions algorithmiques quasi-optimales sont proposées lorsque les communications entre les différents noeuds du système se font de manière asynchrone. Le cas où certains noeuds du système peuvent être en panne est également considéré. Dans un deuxième temps, nous nous intéressons à l'impact de la réplication des données sur le traitement des requêtes. En particulier, un algorithme qui adapte la réplication des données en fonction de la demande est proposé. Cet algorithme couplé à nos algorithmes d'allocation permet de garantir une répartition des requêtes proche de l'idéal pour toute distribution de requêtes. Enfin, nous nous intéressons à l'impact de la réplication quand les requêtes arrivent en flux sur le système. Nous procédons à une évaluation expérimentale sur la base de données distribuées Apache Cassandra. Les expériences réalisées confirment l'intérêt de la réplication et de nos algorithmes d'allocation vis-à-vis des solutions présentes par défaut dans ce système.
Download or read book Une approche pour optimiser les traitements des requ tes dans un environnement de bases de donn es r parties written by In-Sup Paik and published by . This book was released on 1981 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse a pour objectif de proposer une démarche pour effectuer l'optimisation des requêtes dans un systeme de bases de données reparties. On énumère l'ensemble de tous les critères d'optimisation qui peuvent être pris en compte et on décide les objectifs d'optimisation. On propose une démarche progressive divisée en plusieurs étapes qui visent aux objectifs d'optimisation : la localisation, les permutations des opérations, l'allocation des données reparties par le regroupement et la distribution des opérations aux processus repartis par le partitionnement.
Download or read book Une approche pour optimiser les traitements des requ tes dans un environnement de bases de donn es r parties written by In-Sup Paik and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book D couverte et monitoring de ressources pour le traitement de requ tes dans une grille de donn es written by Mahmoud El Samad and published by . This book was released on 2009 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: La gestion des données réparties en environnement de grille de données pose de nouveaux problèmes et présente un réel défi : la découverte de ressources, l'allocation de ressources, la réplication, les services de monitoring pour l'optimisation de requêtes ...etc. Les systèmes de grille diffèrent principalement des systèmes parallèles et distribués par la grande échelle et l'instabilité (i.e. la dynamicité des nœuds). Dans cette thèse, nous nous intéressons à la phase de découverte de ressources pour l'évaluation efficace de requêtes réparties en environnement de grille de données. Nous effectuons d'abord un état de l'art sur les principaux travaux de recherche portant sur la découverte de ressources en se focalisant sur les critères importants (e.g. passage à l'échelle, découverte fiable, faible coût de maintenance) pour la découverte de sources de données qui est spécifique à un environnement de grille de données. Dans cette perspective, nous proposons ensuite une méthode de découverte de sources de données, basée sur l'utilisation des Tables de Hachage Distribuées (THDs), permettant un accès permanent en présence de la dynamicité des nœuds de n'importe quel nœud d'une Organisation Virtuelle OVlocale à toute autre OVi (i [différent de]locale) dans le système, avec un faible coût de maintenance entre les THDs. Après la découverte de ressources, il est très important d'observer l'état actuel de ressources surtout que ces dernières sont partagées à une grande échelle, afin de prendre des décisions sur le choix du nœud d'exécution d'une jointure (ou d'une partie d'une jointure) par exemple. L'observation ou le monitoring de ressources peut être effectué pendant l'allocation initiale ou l'exécution. Dans ce contexte, nous proposons une méthode permettant la prise en compte de la variation des valeurs des paramètres hôtes et réseaux, pendant l'exécution, dans le calcul du temps de réponse d'une opération relationnelle. L'idée est alors d'intégrer les informations de monitoring dans un modèle d'exécution à base d'agents mobiles développé au sein de notre équipe. Enfin, nous validons nos propositions par une évaluation des performances.
Download or read book Concurrency Control and Recovery in Database Systems written by Philip A. Bernstein and published by Addison Wesley Publishing Company. This book was released on 1987 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spinning the Semantic Web written by Dieter Fensel and published by MIT Press. This book was released on 2005 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: A guide to the Semantic Web, which will transform the Web into a structured network of resources organized by meaning and relationships.
Download or read book Adaptive Stream Mining written by Albert Bifet and published by IOS Press. This book was released on 2010 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a significant contribution to the subject of mining time-changing data streams and addresses the design of learning algorithms for this purpose. It introduces new contributions on several different aspects of the problem, identifying research opportunities and increasing the scope for applications. It also includes an in-depth study of stream mining and a theoretical analysis of proposed methods and algorithms. The first section is concerned with the use of an adaptive sliding window algorithm (ADWIN). Since this has rigorous performance guarantees, using it in place of counters or accumulators, it offers the possibility of extending such guarantees to learning and mining algorithms not initially designed for drifting data. Testing with several methods, including Naïve Bayes, clustering, decision trees and ensemble methods, is discussed as well. The second part of the book describes a formal study of connected acyclic graphs, or 'trees', from the point of view of closure-based mining, presenting efficient algorithms for subtree testing and for mining ordered and unordered frequent closed trees. Lastly, a general methodology to identify closed patterns in a data stream is outlined. This is applied to develop an incremental method, a sliding-window based method, and a method that mines closed trees adaptively from data streams. These are used to introduce classification methods for tree data streams.
Download or read book Efficient R Programming written by Colin Gillespie and published by "O'Reilly Media, Inc.". This book was released on 2016-12-08 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are many excellent R resources for visualization, data science, and package development. Hundreds of scattered vignettes, web pages, and forums explain how to use R in particular domains. But little has been written on how to simply make R work effectively—until now. This hands-on book teaches novices and experienced R users how to write efficient R code. Drawing on years of experience teaching R courses, authors Colin Gillespie and Robin Lovelace provide practical advice on a range of topics—from optimizing the set-up of RStudio to leveraging C++—that make this book a useful addition to any R user’s bookshelf. Academics, business users, and programmers from a wide range of backgrounds stand to benefit from the guidance in Efficient R Programming. Get advice for setting up an R programming environment Explore general programming concepts and R coding techniques Understand the ingredients of an efficient R workflow Learn how to efficiently read and write data in R Dive into data carpentry—the vital skill for cleaning raw data Optimize your code with profiling, standard tricks, and other methods Determine your hardware capabilities for handling R computation Maximize the benefits of collaborative R programming Accelerate your transition from R hacker to R programmer
Download or read book Data Analysis written by Wolfgang Gaul and published by Springer. This book was released on 2000-08-09 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Data Analysis" in the broadest sense is the general term for a field of activities of ever-increasing importance in a time called the information age. It covers new areas with such trendy labels as, e.g., data mining or web mining as well as traditional directions emphazising, e.g., classification or knowledge organization. Leading researchers in data analysis have contributed to this volume and delivered papers on aspects ranging from scientific modeling to practical application. They have devoted their latest contributions to a book edited to honor a colleague and friend, Hans-Hermann Bock, who has been active in this field for nearly thirty years.
Download or read book Colloque scientifique international sur le caf written by and published by . This book was released on 1997 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gender Matters written by Dennis van der Veur and published by Council of Europe. This book was released on 2007-01-01 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: "'Gender Matters' is a manual aimed to assist educators and youth leaders work on issues of gender and gender-based violence with young people. This publication presents theoretical information, methods and resources for education and training activities, along with concrete exercises that users can put into practice in their daily work. Violence is a serious issue which directly affects the lives of many young people. It often results in lasting damage to their well-being and integrity, putting even their lives at risk. Gender-based violence, including violence against women, remains a key human rights challenge in contemporary Europe and in the world. Working with young people on human rights education is one way of preventing gender-based violence from occurring. By raising awareness on why and how it manifests and exploring its impact on people and in society, gender-based violence will no longer go undetected. Gender really does matter, to women, to men, to young people - to all of us. This manual serves to explore these human rights issues and act upon them."--Book jacket.
Download or read book The Functional Art written by Alberto Cairo and published by New Riders. This book was released on 2012-08-22 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unlike any time before in our lives, we have access to vast amounts of free information. With the right tools, we can start to make sense of all this data to see patterns and trends that would otherwise be invisible to us. By transforming numbers into graphical shapes, we allow readers to understand the stories those numbers hide. In this practical introduction to understanding and using information graphics, you’ll learn how to use data visualizations as tools to see beyond lists of numbers and variables and achieve new insights into the complex world around us. Regardless of the kind of data you’re working with–business, science, politics, sports, or even your own personal finances–this book will show you how to use statistical charts, maps, and explanation diagrams to spot the stories in the data and learn new things from it. You’ll also get to peek into the creative process of some of the world’s most talented designers and visual journalists, including Condé Nast Traveler’s John Grimwade , National Geographic Magazine’s Fernando Baptista, The New York Times’ Steve Duenes, The Washington Post’s Hannah Fairfield, Hans Rosling of the Gapminder Foundation, Stanford’s Geoff McGhee, and European superstars Moritz Stefaner, Jan Willem Tulp, Stefanie Posavec, and Gregor Aisch. The book also includes a DVD-ROM containing over 90 minutes of video lessons that expand on core concepts explained within the book and includes even more inspirational information graphics from the world’s leading designers. The first book to offer a broad, hands-on introduction to information graphics and visualization, The Functional Art reveals: • Why data visualization should be thought of as “functional art” rather than fine art • How to use color, type, and other graphic tools to make your information graphics more effective, not just better looking • The science of how our brains perceive and remember information ¿ • Best practices for creating interactive information graphics • A comprehensive look at the creative process behind successful information graphics ¿ • An extensive gallery of inspirational work from the world’s top designers and visual artists On the DVD-ROM: In this introductory video course on information graphics, Alberto Cairo goes into greater detail with even more visual examples of how to create effective information graphics that function as practical tools for aiding perception. You’ll learn how to: incorporate basic design principles in your visualizations, create simple interfaces for interactive graphics, and choose the appropriate type of graphic forms for your data. Cairo also deconstructs successful information graphics from The New York Times and National Geographic magazine with sketches and images not shown in the book. All of Peachpit's eBooks contain the same content as the print edition. You will find a link in the last few pages of your eBook that directs you to the media files. Helpful tips: If you are able to search the book, search for "Where are the lesson files?" Go to the very last page of the book and scroll backwards. You will need a web-enabled device or computer in order to access the media files that accompany this ebook. Entering the URL supplied into a computer with web access will allow you to get to the files. Depending on your device, it is possible that your display settings will cut off part of the URL. To make sure this is not the case, try reducing your font size and turning your device to a landscape view. This should cause the full URL to appear.
Download or read book Organizational Intelligence written by Harold L. Wilensky and published by Quid Pro Books. This book was released on 2015-02-14 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: The prize-winning book Organizational Intelligence focuses on the structural and ideological roots of intelligence (informational and analytical) failures in government, industry, and other institutions. It provides groundbreaking theory and structure to the analysis of decision-making processes and their breakdowns, as well as the interactions among experts and the organizations they inform. In this book, both "organization" and "intelligence" are taken to their larger meanings, not just focused on the military meaning of intelligence or on one set of institutions in society. Astute illustrations of intelligence failures abound from real-world cases, such as foreign policy (the Bay of Pigs, Soviet predictions in the Cuban missile crisis), military (civilian bombing of Germany, Pearl Harbor), financial (AmEx's investment in a vegetable oil guru), economics (the Council of Economic Advisers) and industrial production (Ford's Edsel), as well as many other telling arenas and disciplines. Economic, cultural, legal, and political contexts are considered, as well as the more known institutions of government and commerce. The new Classics of the Social Sciences edition from Quid Pro Books features a 2015 Foreword from Neil J. Smelser, University Professor Emeritus at Berkeley and former chair of its sociology department. He writes that the book remains "one of the classics in organizational studies, and—in ways I will indicate—it is still directly relevant to current and future problems of organizational life. ... What makes this book a classic? It is a disciplined, intelligent, and elegant model of applied social science. ... The text itself, richly documented empirically, yields an informed and balanced account of the decision-making process as this is shaped by the quality of information available (and unavailable) to and used (and not used) by organizational leaders." Reviews of the book at the time it was written similarly attest to the originality and breadth of its interdisciplinary analysis. Amitai Etzioni wrote in the American Sociological Review: "This book opens a whole new field — the macrosociology of knowledge. It is as different from the traditional sociology of knowledge as the study of interaction is from that of the structure of total societies." He adds, "The power of Wilensky's contribution is further magnified by his historical perspective. He studies structures and processes, but not in a vacuum." Gordon Craig wrote in The Reporter that the book's examples from organizations "show a similar tendency to believe what they want to believe, to become the victims of their own slogans and propaganda, and to resist or to silence warning voices that challenge their assumptions.... In his fascinating analysis of intelligence failures and their causes ... in the public and private sectors, Wilensky finds that the most disastrous miscalculations are those which have occurred in the field of governmental operations, especially foreign policy and national security." The book explains how such highly institutionalized actors are vulnerable to informational pathologies. The new digital edition features active Contents, a fully linked Index, linked notes, and proper ebook formatting. It is a modern, quality, and authorized re-presentation of a classic work in social science and organizational studies.
Download or read book Veille anticipative une autre approche de l intelligence conomique written by Lesca Nicolas and published by Lavoisier. This book was released on 2006-09-29 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'objet de la veille anticipative, pour les entreprises et les collectivités, est la gestion de l'information de leur environnement extérieur afin d'anticiper les changements importants actuels et futurs pour leur devenir. Cet ouvrage synthétise l'état des recherches sur la veille anticipative et met en évidence leurs limites. Il expose les problématiques auxquelles les entreprises et les collectivités sont confrontées dans leurs démarches de veille et apporte les éléments théoriques et méthodologiques pour aider les praticiens dans leur réflexion sur la mise en place, l'optimisation et l'évaluation de leurs pratiques. Construit comme un dialogue entre la pratique et la théorie, ce livre permet de s'approprier de façon concrète les concepts théoriques et les méthodologies de veille et s'interroge sur de nouveaux axes de recherche.
Download or read book Buyology written by Martin Lindstrom and published by Currency. This book was released on 2010-02-02 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: NEW YORK TIMES BESTSELLER • “A fascinating look at how consumers perceive logos, ads, commercials, brands, and products.”—Time How much do we know about why we buy? What truly influences our decisions in today’s message-cluttered world? In Buyology, Martin Lindstrom presents the astonishing findings from his groundbreaking three-year, seven-million-dollar neuromarketing study—a cutting-edge experiment that peered inside the brains of 2,000 volunteers from all around the world as they encountered various ads, logos, commercials, brands, and products. His startling results shatter much of what we have long believed about what captures our interest—and drives us to buy. Among the questions he explores: • Does sex actually sell? • Does subliminal advertising still surround us? • Can “cool” brands trigger our mating instincts? • Can our other senses—smell, touch, and sound—be aroused when we see a product? Buyology is a fascinating and shocking journey into the mind of today's consumer that will captivate anyone who's been seduced—or turned off—by marketers' relentless attempts to win our loyalty, our money, and our minds.
Download or read book Marketing Management Support Systems written by Berend Wierenga and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marketing management support systems are designed to make marketing managers more effective decision makers in this electronic era. Developments in information technology have caused a marketing data explosion, but have also provided a powerful set of tools that can transform this data into applicable marketing knowledge. Consequently, companies are making major investments in such marketing decision aids. This book is the first comprehensive, systematic textbook on marketing management support systems. The basic issue is the question of how to determine the most effective type of support for a given marketing decision maker in a particular decision situation. The book takes a demand-oriented approach. Decision aids for marketing managers can only be effective if they match with the thinking and reasoning process of the decision makers who use them. Consequently, the important questions addressed in this book are: how do marketing managers make decisions; how can marketing management support systems help to overcome several (cognitive) limitations of human decision makers; and what is the most appropriate type of management support system for assisting the problem-solving methods employed by a marketing decision-maker?
