Ordonnancement sous contraintes de qualité de service dans les clouds

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (926 download)

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Book Synopsis Ordonnancement sous contraintes de qualité de service dans les clouds by : Tom Guérout

Download or read book Ordonnancement sous contraintes de qualité de service dans les clouds written by Tom Guérout and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ces dernières années, de nouvelles problématiques sont nées au vu des considérations écologiques de plus en plus présentes dans notre société. Dans le domaine de la technologie de l'Information, les centres de calcul consomment actuellement environ 1.5% de l'électricité mondiale. Cela ne cesse d'augmenter en raison de l'évolution de nombreux domaines et particulièrement du Cloud Computing. Outre cet aspect environnemental, le contrôle de la consommation d'énergie fait désormais partie intégrante des paramètres de Qualité de Service (QoS) incombant aux fournisseurs de services de Cloud Computing. En effet, ces fournisseurs de services à la demande proposent à leurs utilisateurs un contrat de QoS, appelé SLA (Service Level Agreement), qui définit de manière précise la qualité de service qu'ils s'engagent à respecter. Le niveau de QoS proposé influence directement la qualité d'utilisation des services par les utilisateurs, mais aussi la consommation et le rendement général de l'ensemble des ressources de calcul utilisées, impactant fortement les bénéfices des fournisseurs de services.Le Cloud Computing étant intrinsèquement lié à la virtualisation des ressources de calcul, une élaboration de modèles d'architecture matérielle et logicielle est proposée afin de définir les caractéristiques de l'environnement considéré. Ensuite, une modélisation détaillée de paramètres de QoS en termes de performance, de sûreté de fonctionnement, de sécurité des données et de coûts est proposée. Des métriques associées à ces paramètres sont définies afin d'étendre les possibilités d'évaluation des SLA. Ces modélisations constituent la première contribution de cette thèse.Il convient alors de démontrer comment l'utilisation et l'interprétation de plusieurs métriques de QoS ouvrent la possibilité d'une analyse plus complexe et plus fine de la perspicacité des algorithmes de placement. Cette approche multi-critères leur apporte des informations importantes sur l'état de leur système qu'ils peuvent analyser afin de gérer le niveau de chaque paramètre de QoS. Ainsi, quatre métriques antagonistes, incluant la consommation énergétique, ont été sélectionnées et utilisées conjointement dans plusieurs algorithmes de placement de manière à montrer leur pertinence, l'enrichissement qu'elles apportent à ces algorithmes, et comment un fournisseur de service peut tirer profit des résultats d'une optimisation multi-objectifs. Cette seconde contribution présente un algorithme génétique (GA) ainsi que deux algorithmes gloutons. L'analyse du comportement de l'algorithme génétique a permis de démontrer différents intérêts d'une optimisation multi-critères appliquée à des métriques de QoS habituellement ignorées dans les études dédiées au Cloud Computing.La troisième contribution de cette thèse propose une étude de l'impact de l'utilisation des métriques de QoS sur l'ordonnancement de machines virtuelles au cours du temps. Pour cela, le simulateur CloudSim a été exploité et étendu afin d'améliorer ses fonctionnalités de gestion de consommation énergétique. Tout d'abord par l'ajout du DVFS (Dynamic Voltage & Frequency Scaling) apportant une gestion dynamique très précise des fréquences de fonctionnement CPU, puis la possibilité de reconfiguration de machines virtuelles et enfin par la gestion dynamique des évènements. Les simulations effectuées mettent en jeu l'ensemble de ces outils énergétiques ainsi que les algorithmes de placement et évaluent chacune des métriques de QoS sélectionnées. Ces simulations donnent une vision temporelle de l'évolution de celles-ci, en fonction des algorithmes utilisés et de plusieurs configurations d'optimisation du GA. Cela permet d'analyser sous différents angles le comportement des algorithmes gloutons, l'impact des optimisations du GA, et l'influence des métriques les unes par rapport aux autres.Une collaboration a pu être établie avec le laboratoire CLOUDS Laborartory de Melbourne, dirigé par Prof. Rajkumar Buyya.

Ordonnancement temps réel avec contraintes de qualité de service

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ISBN 13 :
Total Pages : 227 pages
Book Rating : 4.:/5 (494 download)

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Book Synopsis Ordonnancement temps réel avec contraintes de qualité de service by : Audrey Marchand

Download or read book Ordonnancement temps réel avec contraintes de qualité de service written by Audrey Marchand and published by . This book was released on 2006 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le travail de thèse présenté dans ce rapport a pour finalité de proposer des solutions à l'ordonnancement dans les systèmes informatiques temps-réel à contraintes fermes (TRCF). Le système est supposé assurer l'ordonnancement de tâches périodiques définies sous des contraintes de Qualité de Service (QoS). Il doit aussi être capable de gérer l'occurrence de tâches apériodiques pouvant induire une surcharge temporaire de traitement. Dans un premier temps, une introduction à l'ordonnancement dans les systèmes temps-réel et une synthèse bibliographique sur l'ordonnancement en présence de surcharge, sont présentées. En second lieu, deux nouvelles stratégies d'ordonnancement de tâches périodiques définies sous des contraintes de QoS utilisant le modèle Skip-Over, sont proposées. Nous consacrons ensuite notre étude à la problématique de l'ordonnancement d'un ensemble hybride de tâches constitué de tâches périodiques définies sous des contraintes de QoS et de tâches apériodiques. La contribution des travaux de thèse se focalise sur l'utilisation du serveur optimal EDL (Earliest Deadline as Late as possible) avec des tâches périodiques présentant des contraintes de QoS. Puis, nous nous intéressons à l'évaluation des stratégies d'ordonnancement proposées sur la base d, la stabilité et la robustesse. S'appuyant sur des travaux précédents relatifs à la tolérance aux fautes, nous présentons deux nouveaux algorithmes d'ordonnancement pour le modèle Skip-Over, qui améliorent le comportement d'un système avec des contraintes de QoS. En dernier lieu, nous présentons l'intégration, sous Linux temps-réel, des différentes stratégies d'ordonnancement sous contraintes de QoS.

ORDONNANCEMENT AUTOMATIQUE D'APPLICATIONS PRESENTANT DES CONTRAINTES DE QUALITE DE SERVICE TEMPORELLES

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ISBN 13 :
Total Pages : 171 pages
Book Rating : 4.:/5 (49 download)

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Book Synopsis ORDONNANCEMENT AUTOMATIQUE D'APPLICATIONS PRESENTANT DES CONTRAINTES DE QUALITE DE SERVICE TEMPORELLES by : JOCELYNE.. GISSLER FARHAT

Download or read book ORDONNANCEMENT AUTOMATIQUE D'APPLICATIONS PRESENTANT DES CONTRAINTES DE QUALITE DE SERVICE TEMPORELLES written by JOCELYNE.. GISSLER FARHAT and published by . This book was released on 1996 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: DANS CETTE THESE NOUS NOUS INTERESSONS AU SUPPORT DES APPLICATIONS PRESENTANT DES CONTRAINTES DE QUALITE DE SERVICE (QOS) TEMPORELLES. LA PRISE EN COMPTE DE CES CONTRAINTES EST AJOURD'HUI FAITE MANUELLEMENT PAR LE DEVELOPPEUR D'APPLICATIONS QUI DOIT LES TRADUIRE EN DIRECTIVES D'ORDONNANCEMENT. NOUS PROPOSONS UNE APPROCHE DANS LAQUELLE LES CONTRAINTES DE QOS TEMPORELLES SONT AUTOMATIQUEMENT TRADUITES EN DIRECTIVES D'ORDONNANCEMENT. DANS CETTE APPROCHE, LE DEVELOPPEUR D'APPLICATIONS SPECIFIE DES CONTRAINTES TEMPORELLES ENTRE LES EVENEMENTS IMPORTANTS DE SON APPLICATION (SOUS FORME D'EQUATIONS DE QOS SIMPLES). CES CONTRAINTES TEMPORELLES SONT ALORS AUTOMATIQUEMENT TRADUITES EN DIRECTIVES D'ORDONNACEMENT. POUR CE FAIRE, LES FILS DE CONTROLE DE L'APPLICATION SONT DECOUPES EN BRINS AUXQUELS ON ASSOCIE DES ECHEANCES DERIVEES DES CONTRAINTES TEMPORELLES SPECIFIEES. LA DECOMPOSITION EN BRINS GUIDE L'ORDONNANCEMENT DES FILS DE CONTROLE APPLICATIFS ASSOCIES. LE SYSTEME SUPPORT MET EN UVRE UN MECANISME D'ORDONNANCEMENT COOPERATIF BASE SUR UN DIALOGUE ENTRE L'ORDONNANCEUR DU SYSTEME D'EXPLOITATION ET L'ORDONNANCEUR APPLICATIF. LES DEUX ORDONNANCEURS APPLIQUENT UNE POLITIQUE D'ORDONNANCEMENT EDF (ECHEANCE LA PLUS PROCHE D'ABORD). ILS ORDONNANCENT AU MIEUX EN TENANT COMPTE DES CONTRAINTES IMPOSEES. ETANT DONNE QUE CETTE APPROCHE NE PERMET PAS DE GARANTIR LE RESPECT DES CONTRAINTES DE QOS TEMPORELLES, LES APPLICATIONS DOIVENT ETRE CAPABLES D'ADAPTER CES CONTRAINTES A L'ENVIRONNEMENT D'EXECUTION ET PAR LA-MEME AUX VARIATIONS DE LA CHARGE DU SYSTEME. POUR CETTE RAISON, L'ORDONNANCEUR APPLICATIF MET EN UVRE UNE POLITIQUE DE GESTION DES VARIATIONS DE LA CHARGE BASEE SUR LES SPECIFICATIONS DU DEVELOPPEUR D'APPLICATIONS. UN PROTOCOLE DE PARTAGE DES RESSOURCES EST EGALEMENT PROPOSE POUR PERMETTRE AUX FILS DE CONTROLE APPLICATIFS DE PARTAGER DES RESSOURCES SANS RISQUE D'INTER-BLOCAGE. DES MESURES DU COUT ADDITIONNEL ENGENDRE PAR L'ORDONNANCEMENT AUTOMATIQUE SONT EFFECTUEES GRACE A UN DEMONSTRATEUR QUE NOUS AVONS DEVELOPPE. LES MESURES SONT ENCOURAGEANTES. ELLES SONT, CEPENDANT TRES DEPENDANTES DE LA STRUCTURE DU GRAPHE DE DEPENDANCES GENERE A PARTIR DES PORTIONS DE CODE DE L'APPLICATION.

Neural Networks

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Publisher : Springer Science & Business Media
ISBN 13 : 3540288473
Total Pages : 509 pages
Book Rating : 4.5/5 (42 download)

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Book Synopsis Neural Networks by : Gérard Dreyfus

Download or read book Neural Networks written by Gérard Dreyfus and published by Springer Science & Business Media. This book was released on 2005-11-25 with total page 509 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neural networks represent a powerful data processing technique that has reached maturity and broad application. When clearly understood and appropriately used, they are a mandatory component in the toolbox of any engineer who wants make the best use of the available data, in order to build models, make predictions, mine data, recognize shapes or signals, etc. Ranging from theoretical foundations to real-life applications, this book is intended to provide engineers and researchers with clear methodologies for taking advantage of neural networks in industrial, financial or banking applications, many instances of which are presented in the book. For the benefit of readers wishing to gain deeper knowledge of the topics, the book features appendices that provide theoretical details for greater insight, and algorithmic details for efficient programming and implementation. The chapters have been written by experts and edited to present a coherent and comprehensive, yet not redundant, practically oriented introduction.

Project Scheduling

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Publisher : Springer Science & Business Media
ISBN 13 : 1461555337
Total Pages : 534 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Project Scheduling by : Jan Weglarz

Download or read book Project Scheduling written by Jan Weglarz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: Project scheduling problems are, generally speaking, the problems of allocating scarce resources over time to perform a given set of activities. The resources are nothing other than the arbitrary means which activities complete for. Also the activities can have a variety of interpretations. Thus, project scheduling problems appear in a large spectrum of real-world situations, and, in consequence, they have been intensively studied for almost fourty years. Almost a decade has passed since the multi-author monograph: R. Slowinski, 1. W~glarz (eds. ), Advances in Project Scheduling, Elsevier, 1989, summarizing the state-of-the-art across project scheduling problems, was published. Since then, considerable progress has been made in all directions of modelling and finding solutions to these problems. Thus, the proposal by Professor Frederick S. Hillier to edit a handbook which reports on the recent advances in the field came at an exceptionally good time and motivated me to accept the challenge. Fortunately, almost all leading experts in the field have accepted my invitation and presented their completely new advances often combined with expository surveys. Thanks to them, the handbook stands a good chance of becoming a key reference point on the current state-of-the-art in project scheduling, as well as on new directions in the area. The contents are divided into four parts. The first one, dealing with classical models -exact algorithms, is preceded by a proposition of the classification scheme for scheduling problems.

FiWi Access Networks

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Publisher : Cambridge University Press
ISBN 13 : 1139504665
Total Pages : 276 pages
Book Rating : 4.1/5 (395 download)

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Book Synopsis FiWi Access Networks by : Martin Maier

Download or read book FiWi Access Networks written by Martin Maier and published by Cambridge University Press. This book was released on 2011-12-15 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: The evolution of broadband access networks toward bimodal fiber-wireless (FiWi) access networks, described in this book, may be viewed as the endgame of broadband access. After discussing the economic impact of broadband access and current worldwide deployment statistics, all the major legacy wireline and wireless broadband access technologies are reviewed. State-of-the-art GPON and EPON fiber access networks are described, including their migration to next-generation systems such as OCDMA and OFDMA PONs. The latest developments of wireless access networks are covered, including VHT WLAN, Gigabit WiMAX, LTE and WMN. The advantages of FiWi access networks are demonstrated by applying powerful network coding, heterogeneous optical and wireless protection, hierarchical frame aggregation, hybrid routing and QoS continuity techniques across the optical-wireless interface. The book is an essential reference for anyone working on optical fiber access networks, wireless access networks or converged FiWi systems.

Adaptive Stream Mining

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Publisher : IOS Press
ISBN 13 : 1607500906
Total Pages : 224 pages
Book Rating : 4.6/5 (75 download)

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Book Synopsis Adaptive Stream Mining by : Albert Bifet

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.

Arctic Shipping

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Publisher : Routledge
ISBN 13 : 1351037447
Total Pages : 217 pages
Book Rating : 4.3/5 (51 download)

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Book Synopsis Arctic Shipping by : Frédéric Lasserre

Download or read book Arctic Shipping written by Frédéric Lasserre and published by Routledge. This book was released on 2019-09-05 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book considers both the present state of Arctic shipping and possible future trends with reference to the various sectors of maritime transportation: cruise tourism, container traffic and bulk shipping. Ports are analysed as tools that support the strategies of coastal states to foster the development of resource extraction, enhance the attractiveness of Arctic shipping lanes and enable the control of maritime activities through coast guard deployment. The aim of this book is to draw a picture of the trends of Arctic shipping. How is traffic evolving in Canada’s Arctic, or along the Northern Sea Route? Are there significant differences between bulk and container shipping segments when considering the Arctic market? How are the ports and the hinterland developing and what are the strategies behind those? How is the legal framework shaping the evolution of maritime transportation? The contributors to this book consider all of these questions, and more, as they map out the prospects for Arctic shipping and analyse in detail the development of Arctic shipping as a result of multi-variable interactions. This book will be key reading for industry professionals and post-graduate students alike.

Jews in Early Christian Law

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Publisher : Brepols Publishers
ISBN 13 :
Total Pages : 388 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Jews in Early Christian Law by : John Victor Tolan

Download or read book Jews in Early Christian Law written by John Victor Tolan and published by Brepols Publishers. This book was released on 2014 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: What is the place of Jews in medieval Christian societies? in the ninetheenth and early twentieth centuries, this question was largely confined to Jewish scholars, and the academic debates where inseparable from the upheavels of the lives of contemporary European Jews.

Project Scheduling

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Publisher : Springer Science & Business Media
ISBN 13 : 1402070519
Total Pages : 701 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis Project Scheduling by : Erik Leuven Demeulemeester

Download or read book Project Scheduling written by Erik Leuven Demeulemeester and published by Springer Science & Business Media. This book was released on 2002-06-30 with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt: Project management can be broadly defined as the process of managing, allocating and timing resources to achieve given objectives in an efficient and expedient manner. The objectives of the book cover three areas: classification; procedures; and problems.

Performance Analysis of Communications Networks and Systems

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Publisher : Cambridge University Press
ISBN 13 : 1139450824
Total Pages : 545 pages
Book Rating : 4.1/5 (394 download)

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Book Synopsis Performance Analysis of Communications Networks and Systems by : Piet Van Mieghem

Download or read book Performance Analysis of Communications Networks and Systems written by Piet Van Mieghem and published by Cambridge University Press. This book was released on 2009-04-09 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: This rigourous and self-contained book describes mathematical and, in particular, stochastic methods to assess the performance of networked systems. It consists of three parts. The first part is a review on probability theory. Part two covers the classical theory of stochastic processes (Poisson, renewal, Markov and queuing theory), which are considered to be the basic building blocks for performance evaluation studies. Part three focuses on the relatively new field of the physics of networks. This part deals with the recently obtained insights that many very different large complex networks - such as the Internet, World Wide Web, proteins, utility infrastructures, social networks - evolve and behave according to more general common scaling laws. This understanding is useful when assessing the end-to-end quality of communications services, for example, in Internet telephony, real-time video and interacting games. Containing problems and solutions, this book is ideal for graduate students taking courses in performance analysis.

Prime Numbers

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Publisher : Springer Science & Business Media
ISBN 13 : 0387289798
Total Pages : 597 pages
Book Rating : 4.3/5 (872 download)

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Book Synopsis Prime Numbers by : Richard Crandall

Download or read book Prime Numbers written by Richard Crandall and published by Springer Science & Business Media. This book was released on 2006-04-07 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridges the gap between theoretical and computational aspects of prime numbers Exercise sections are a goldmine of interesting examples, pointers to the literature and potential research projects Authors are well-known and highly-regarded in the field

CIKM'13

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Publisher :
ISBN 13 : 9781450326964
Total Pages : 938 pages
Book Rating : 4.3/5 (269 download)

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Book Synopsis CIKM'13 by : CIKM 13 Conference Committee

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.

Good Governance and the European Union

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Publisher : Intersentia nv
ISBN 13 : 9050953816
Total Pages : 290 pages
Book Rating : 4.0/5 (59 download)

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Book Synopsis Good Governance and the European Union by : Deirdre Curtin

Download or read book Good Governance and the European Union written by Deirdre Curtin and published by Intersentia nv. This book was released on 2005 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book approaches the notion of good governance from three different angles. First it establishes whether it is a meaningful notion at all by taking a closer look at the parameters of good governance. Secondly, the authors look at the institutional translation of the criteria of good governance. In a third dimension, the concept may be analysed in relation to a number of substantive issues.

Esprits modernes

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Publisher : Vlad Alexandrescu
ISBN 13 : 9736640094
Total Pages : 240 pages
Book Rating : 4.7/5 (366 download)

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Book Synopsis Esprits modernes by : Vlad Alexandrescu

Download or read book Esprits modernes written by Vlad Alexandrescu and published by Vlad Alexandrescu. This book was released on 2003 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Consumption Takes Time

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Publisher : Routledge
ISBN 13 : 1134530846
Total Pages : 261 pages
Book Rating : 4.1/5 (345 download)

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Book Synopsis Consumption Takes Time by : Ian Steedman

Download or read book Consumption Takes Time written by Ian Steedman and published by Routledge. This book was released on 2001-03-29 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: Standard economic theory of consumer behaviour considers consumers' preferences, their incomes and commodity prices to be the determinants of consumption. However, consumption takes time and no consumer has more - or less - than 168 hours per week. This simple fact is almost invisible in standard theory, and takes the centre stage in this book. Whe

From Prognostics and Health Systems Management to Predictive Maintenance 2

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Publisher : Wiley-ISTE
ISBN 13 : 9781848219380
Total Pages : 170 pages
Book Rating : 4.2/5 (193 download)

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Book Synopsis From Prognostics and Health Systems Management to Predictive Maintenance 2 by : Brigitte Chebel-Morello

Download or read book From Prognostics and Health Systems Management to Predictive Maintenance 2 written by Brigitte Chebel-Morello and published by Wiley-ISTE. This book was released on 2017-08-07 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the second volume in a set of books dealing with the evolution of technology, IT and organizational approaches and what this means for industrial equipment. The authors address this increasing complexity in two parts, focusing specifically on the field of Prognostics and Health Management (PHM). Having tackled the PHM cycle in the first volume, the purpose of this book is to tackle the other phases of PHM, including the traceability of data, information and knowledge, and the ability to make decisions accordingly. The book concludes with a summary analysis and perspectives regarding this emerging domain, since without traceability, knowledge and decision, any prediction of the health state of a system cannot be exploited.