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Author: VERONIQUE.. LACROSE
Publisher:
ISBN:
Category :
Languages : fr
Pages : 178
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Book Description
LA COMMANDE EN LOGIQUE FLOUE PERMET DE S'AFFRANCHIR DE L'UTILISATION DE MODELES MATHEMATIQUES PARFOIS DIFFICILES A OBTENIR. SA CAPACITE A TRADUIRE LA CONNAISSANCE D'UN OPERATEUR HUMAIN EN REGLES D'EXPERTISE ENONCEES DANS UN LANGAGE SIMPLE EN FAIT UNE TECHNIQUE TRES PROMETTEUSE. NEANMOINS, LORSQUE LE NOMBRE DE VARIABLES ENTRANT EN JEU DEVIENT TROP IMPORTANT, LA BASE DE REGLES EXPLOSE TRES VITE, ET DES PROBLEMES LIES A SA REALISATION PRATIQUE EN DECOULENT. CETTE THESE S'INSCRIT DANS LA MOUVANCE DES TRAVAUX ACTUELS SUR LA COMMANDE FLOUE ET S'ATTACHE AU PROBLEME DE L'EXPLOSION COMBINATOIRE DU NOMBRE DE REGLES. DANS UNE PREMIERE PARTIE, LES PRINCIPES DE BASE DE LA LOGIQUE FLOUE ET DE LA COMMANDE FLOUE SONT RAPPELES. DANS UNE DEUXIEME PARTIE, DES SOLUTIONS VISANT A SIMPLIFIER LA SYNTHESE D'UN CONTROLEUR FLOU SONT PRESENTEES. DEUX CAS SONT CONSIDERES : LA BASE DE REGLES EXISTE DEJA, LA BASE DE REGLES N'EST PAS DISPONIBLE ET LA SYNTHESE D'UN CONTROLEUR FLOU DE COMPLEXITE REDUITE EST A REALISER. DANS LA PRATIQUE, ON NE DISPOSE GENERALEMENT PAS DE CETTE BASE DE REGLES, AUSSI, ON INSISTE DAVANTAGE SUR LE DEUXIEME CAS DE FIGURE. UNE FOIS LA STRUCTURE DU CONTROLEUR FLOU DEFINI, LE NOMBRE DE PARAMETRES A REGLER POUVANT ATTEINDRE UN NOMBRE IMPORTANT, IL EST INTERESSANT D'UTILISER DES TECHNIQUES D'APPRENTISSAGE AFIN D'AUTOMATISER LA MISE AU POINT DU CONTROLEUR FLOU. LES PARAMETRES DE CE DERNIER (GAINS ET FONCTIONS D'APPARTENANCE, EN ENTREE ET EN SORTIE) SONT ICI REGLES A TRAVERS LA METHODE, TRES SIMPLE, DE DESCENTE DU GRADIENT. DANS UNE TROISIEME PARTIE, LA DEMARCHE PROPOSEE DANS CE MEMOIRE EST APPLIQUEE AVEC SUCCES A LA COMMANDE DE DEUX PROCESSUS MULTIVARIABLES : UN BAC MELANGEUR ET UN PROCEDE BIOLOGIQUE DE TRAITEMENT DES EAUX-USEES.
Author: VERONIQUE.. LACROSE
Publisher:
ISBN:
Category :
Languages : fr
Pages : 178
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Book Description
LA COMMANDE EN LOGIQUE FLOUE PERMET DE S'AFFRANCHIR DE L'UTILISATION DE MODELES MATHEMATIQUES PARFOIS DIFFICILES A OBTENIR. SA CAPACITE A TRADUIRE LA CONNAISSANCE D'UN OPERATEUR HUMAIN EN REGLES D'EXPERTISE ENONCEES DANS UN LANGAGE SIMPLE EN FAIT UNE TECHNIQUE TRES PROMETTEUSE. NEANMOINS, LORSQUE LE NOMBRE DE VARIABLES ENTRANT EN JEU DEVIENT TROP IMPORTANT, LA BASE DE REGLES EXPLOSE TRES VITE, ET DES PROBLEMES LIES A SA REALISATION PRATIQUE EN DECOULENT. CETTE THESE S'INSCRIT DANS LA MOUVANCE DES TRAVAUX ACTUELS SUR LA COMMANDE FLOUE ET S'ATTACHE AU PROBLEME DE L'EXPLOSION COMBINATOIRE DU NOMBRE DE REGLES. DANS UNE PREMIERE PARTIE, LES PRINCIPES DE BASE DE LA LOGIQUE FLOUE ET DE LA COMMANDE FLOUE SONT RAPPELES. DANS UNE DEUXIEME PARTIE, DES SOLUTIONS VISANT A SIMPLIFIER LA SYNTHESE D'UN CONTROLEUR FLOU SONT PRESENTEES. DEUX CAS SONT CONSIDERES : LA BASE DE REGLES EXISTE DEJA, LA BASE DE REGLES N'EST PAS DISPONIBLE ET LA SYNTHESE D'UN CONTROLEUR FLOU DE COMPLEXITE REDUITE EST A REALISER. DANS LA PRATIQUE, ON NE DISPOSE GENERALEMENT PAS DE CETTE BASE DE REGLES, AUSSI, ON INSISTE DAVANTAGE SUR LE DEUXIEME CAS DE FIGURE. UNE FOIS LA STRUCTURE DU CONTROLEUR FLOU DEFINI, LE NOMBRE DE PARAMETRES A REGLER POUVANT ATTEINDRE UN NOMBRE IMPORTANT, IL EST INTERESSANT D'UTILISER DES TECHNIQUES D'APPRENTISSAGE AFIN D'AUTOMATISER LA MISE AU POINT DU CONTROLEUR FLOU. LES PARAMETRES DE CE DERNIER (GAINS ET FONCTIONS D'APPARTENANCE, EN ENTREE ET EN SORTIE) SONT ICI REGLES A TRAVERS LA METHODE, TRES SIMPLE, DE DESCENTE DU GRADIENT. DANS UNE TROISIEME PARTIE, LA DEMARCHE PROPOSEE DANS CE MEMOIRE EST APPLIQUEE AVEC SUCCES A LA COMMANDE DE DEUX PROCESSUS MULTIVARIABLES : UN BAC MELANGEUR ET UN PROCEDE BIOLOGIQUE DE TRAITEMENT DES EAUX-USEES.
Author: Veronique Lacrose
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Author: Bernard Demaya
Publisher:
ISBN:
Category :
Languages : fr
Pages : 176
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Book Description
Cette thèse s'inscrit dans la mouvance des nombreux travaux actuels sur la commande floue avec un souci d'application à la conception des systèmes automobiles embarqués, notamment pour le contrôle-moteur. La commande floue consiste à utiliser la connaissance de l'opérateur humain et à la synthétiser sous la forme de règles d'expertise ; cette technique permet donc de s'affranchir de l'utilisation de modèles mathématiques et d'intégrer des critères qualitatifs ou subjectifs dans la synthèse d'un système de commande. Dans une première étape, des généralités sur la commande floue et sur la conception des contrôleurs flous sont exposées. Puis, quelques points particuliers sont développées, notamment la commande des processus à dynamiques complexes. La justification et les performances de ces approches sont validées sur un «benchmark» issu du domaine de la commande adaptative. La faisabilité économique de ces structures de commande est ensuite illustrée expérimentalement sur deux applications bien différentes mais relatives au contrôle-moteur. La première application, qui est entièrement basée sur un jeu de règles d'expertise, consiste à supprimer le cliquetis. Les corrections apportées à la commande du système sont adaptées aux caractéristiques du phénomène, ce qui permet de limiter au mieux les dégradations des performances du moteur. La deuxième application concerne la régulation du ralenti. Après une première étude en simulation, un contrôleur flou est spécifié. Des essais sur véhicule permettent ensuite d'améliorer cette première solution et de proposer une nouvelle structure de commande floue. La configuration retenue autorise un réglage du confort acoustique et de conduite dans les différentes phases de fonctionnement. Et grâce à une diminution du régime de ralenti, elle devrait permettre une réduction de la consommation de carburant et de la pollution, surtout en cycle urbain où la régulation du ralenti est fortement sollicitée.
Author: Gérard Dreyfus
Publisher: Springer Science & Business Media
ISBN: 3540288473
Category : Science
Languages : en
Pages : 509
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Book Description
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.
Author: Ahmed Belasri
Publisher: Springer Nature
ISBN: 9811554447
Category : Technology & Engineering
Languages : en
Pages : 659
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Book Description
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Author: Pierre Bourdieu
Publisher: Polity
ISBN: 0745646956
Category : History
Languages : en
Pages : 398
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Book Description
In the late 1950s, like tens of thousands of young men of his generation, Pierre Bourdieu, having recently passed the agrégation in philosophy, found himself immersed in the Algerian war. Motivated by an impulse that, as he himself says, ‘was civic rather than political’, nothing seemed more important to him than to understand the Algerian situation and provide the elements that would enable others to come to an informed judgement about it. In extremely tough conditions and along with a small group of students, Bourdieu undertook a series of studies across an Algeria that was tightly patrolled by the army, leading him to discover the shocking reality of the resettlement camps and to analyse the mechanisms of destruction of Algerian society of which they were emblematic. To achieve the objectives he had set himself, Bourdieu had to carry out a genuine intellectual conversion, acquiring an ethnographic understanding of Algerian society, learning sociological analysis at a breakneck pace and inventing new instruments - both theoretical and empirical - that would enable him to understand the relations of domination specific to colonialism. These new tools also enabled him to analyse the nature of the crisis that the war had both produced and manifested. This unique volume brings together the first texts written by Bourdieu in the midst of the Algerian conflict, as well as later writings and interviews in which he returns to the topic of Algeria and the decisive role it played in the development of his work.
Author: Pierre Bourdieu
Publisher: John Wiley & Sons
ISBN: 0745681654
Category : Social Science
Languages : en
Pages : 456
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Book Description
Much orthodox economic theory is based on assumptions which are treated as self-evident: supply and demand are regarded as independent entities, the individual is assumed to be a rational agent who knows his interests and how to make decisions corresponding to them, and so on. But one has only to examine an economic transaction closely, as Pierre Bourdieu does here for the buying and selling of houses, to see that these abstract assumptions cannot explain what happens in reality. As Bourdieu shows, the market is constructed by the state, which can decide, for example, whether to promote private housing or collective provision. And the individuals involved in the transaction are immersed in symbolic constructions which constitute, in a strong sense, the value of houses, neighbourhoods and towns. The abstract and illusory nature of the assumptions of orthodox economic theory has been criticised by some economists, but Bourdieu argues that we must go further. Supply, demand, the market and even the buyer and seller are products of a process of social construction, and so-called ‘economic' processes can be adequately described only by calling on sociological methods. Instead of seeing the two disciplines in antagonistic terms, it is time to recognize that sociology and economics are in fact part of a single discipline, the object of which is the analysis of social facts, of which economic transactions are in the end merely one aspect. This brilliant study by the most original sociologist of post-war France will be essential reading for students and scholars of sociology, economics, anthropology and related disciplines.
Author: Sandip Mazumder
Publisher: Academic Press
ISBN: 0128035048
Category : Mathematics
Languages : en
Pages : 484
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Book Description
Numerical Methods for Partial Differential Equations: Finite Difference and Finite Volume Methods focuses on two popular deterministic methods for solving partial differential equations (PDEs), namely finite difference and finite volume methods. The solution of PDEs can be very challenging, depending on the type of equation, the number of independent variables, the boundary, and initial conditions, and other factors. These two methods have been traditionally used to solve problems involving fluid flow. For practical reasons, the finite element method, used more often for solving problems in solid mechanics, and covered extensively in various other texts, has been excluded. The book is intended for beginning graduate students and early career professionals, although advanced undergraduate students may find it equally useful. The material is meant to serve as a prerequisite for students who might go on to take additional courses in computational mechanics, computational fluid dynamics, or computational electromagnetics. The notations, language, and technical jargon used in the book can be easily understood by scientists and engineers who may not have had graduate-level applied mathematics or computer science courses. - Presents one of the few available resources that comprehensively describes and demonstrates the finite volume method for unstructured mesh used frequently by practicing code developers in industry - Includes step-by-step algorithms and code snippets in each chapter that enables the reader to make the transition from equations on the page to working codes - Includes 51 worked out examples that comprehensively demonstrate important mathematical steps, algorithms, and coding practices required to numerically solve PDEs, as well as how to interpret the results from both physical and mathematic perspectives
Author: Carolyn Côté-Lussier
Publisher: University of Ottawa Press
ISBN: 0776628720
Category : Social Science
Languages : en
Pages : 396
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Book Description
Contemporary Criminological Issues tackles some of today’s most pressing social issues, from the criminalization of Indigenous peoples to interpersonal violence, border control, and armed conflicts. This book advances cutting-edge theories and methods, with the aim of moving beyond the scholarship that reproduces insecurity and exclusion. The breadth of approaches encompasses much of the current critical criminological scholarship, serving as a counterpoint to the growth of managerial and administrative criminologies and the rise of explicitly exclusionary and punitive state policies and practices with respect to ‘crime’ and ‘security.’ This edited collection featuring two books, one in English and one in French, includes important contributions to knowledge and public policy by eminent experts and emerging scholars. This book is published in English.
Author: United States. Forest Service. Northern Region
Publisher:
ISBN:
Category : Forest management
Languages : en
Pages : 138
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Book Description
