Dissertations / Theses on the topic 'Systèmes à paramètres répartis – Gestion – Modèles mathématiques'
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Fitouhi, Mohamed Chahir. "Optimisation de la planification intégrée de la maintenance préventive et de la production des systèmes multi-états." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/28234/28234.pdf.
Full textFauré, Fabienne. "Gestion de configuration et migration dans les systèmes coopératifs : une architecture répartie orientée services." Toulouse 3, 1994. http://www.theses.fr/1994TOU30253.
Full textCanon, Louis-claude. "Outils et algorithmes pour gérer l'incertitude lors de l'ordonnancement d'application sur plateformes distribuées." Thesis, Nancy 1, 2010. http://www.theses.fr/2010NAN10097/document.
Full textThis thesis consists in revisiting traditional scheduling problematics in computational environments, and considering the adjunction of uncertainty in the models. We adopt here a wide definition of uncertainty that encompasses the intrinsic stochastic nature of some phenomena (e.g., processor failures that follow a Poissonian distribution) and the imperfection of model characteristics (e.g., inaccuracy of the costs in a model due to a bias in measurements). We also consider uncertainties that stem from indeterminations such as the user behaviors that are uncontrolled although being deterministic. Scheduling, in its general form, is the operation that assigns requests to resources in some specific way. In distributed environments, we are concerned by a workload (i.e., a set of tasks) that needs to be executed onto a computational platform (i.e., a set of processors). Therefore, our objective is to specify how tasks are mapped onto processors. Produced schedules can be evaluated through many different metrics (e.g., processing time of the workload, resource usage, etc) and finding an optimal schedule relatively to some metric constitutes a challenging issue. Probabilistic tools and multi-objectives optimization techniques are first proposed for tackling new metrics that arise from the uncertainty. In a second part, we study several uncertainty-related criteria such as the robustness (stability in presence of input variations) or the reliability (probability of success) of a schedule
Villemur, Thierry. "Conception de services et de protocoles pour la gestion de groupes coopératifs." Phd thesis, Université Paul Sabatier - Toulouse III, 1995. http://tel.archives-ouvertes.fr/tel-00146528.
Full textChentouf, Boumediène. "Contribution à la stabilité et à la stabilisation de systèmes à paramètres répartis." Metz, 1998. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1998/Chentouf.Boumediene.SMZ9862.pdf.
Full textThis work contributes to the stability and the stabilization of distributed parameter systems. Our first result is the exponential stability of a coupled contraflow heat-exchanger which was modeled to simulate dynamic behaviour of industrial Alumina furnace. This result is, in fact, an application of a theorem which we established and that shows the exponential stability of a class of hyperbolic linear systems with L[infini]-coefficients. Furthermore, we dealt with the boundary feedback stabilization problem of a variant of model SCOLE (beam+antenna) introduced by the engineers of NASA. We considered the case where the acceleration term of the antenna is neglected whereas in the other case we neglected its moment of inertia. We proved in both cases uniform stabilization of the system by simple and usual controls (force and/or moment). Moreover, we presented a spectral study which is illustrated by numerical simulations. We were also interested in stabilization problem of a flexible arm with a variable stiffness. We proved the strong stabilisation of the energy by nonlinear feedback laws depending only on boundary velocities. Next, under growth conditions on the laws, the uniform and the rational decay rate of the energy is also estimated. Finally, a study is devoted to the stabilization of body-beam system without damping. We proposed nonlinear controls and we proved the exponential stability of the closed loop system. This new result, which is an extension of the linear case treated in the literature, is not deprived of practical interest since our class of controls avoid eventually some saturation phenomena in the actuators
Soro, Wassy Isaac. "Modélisation et optimisation des performances et de la maintenance des systèmes multi-états." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/27614/27614.pdf.
Full textSlimi, Redouane. "Modélisation et simulation des systèmes distribués étalable par automates cellulaires." Perpignan, 2008. http://www.theses.fr/2008PERP0877.
Full textHus, Philippe. "Modélisation et simulation d'un procédé de séparation à membrane en régime dynamique : application à la pervaporation." Lille 1, 1997. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1997/50376-1997-31.pdf.
Full textRaoux, Jean-Jacques. "Modélisation non-linéaire des composants électroniques : du modèle analytique au modèle tabulaire paramétrique." Limoges, 1995. http://www.theses.fr/1995LIMO0006.
Full textDufour, Pascal. "Contribution à la commande prédictive des systèmes à paramètres répartis non linéaires." Phd thesis, Université Claude Bernard - Lyon I, 2000. http://tel.archives-ouvertes.fr/tel-00337724.
Full textSirdey, Renaud. "Modèles et algorithmes pour la reconfiguration de systèmes répartis utilisés en téléphonie cellulaire." Phd thesis, Université de Technologie de Compiègne, 2007. http://tel.archives-ouvertes.fr/tel-00189425.
Full textEn quelques mots, ce problème consiste, étant donnée une répartition arbitraire admissible de processus sur les processeurs d'un système réparti, à trouver une séquence d'opérations (migrations de processus sans effet sur le service ou arrêts temporaires) de moindre impact par le biais de laquelle une autre répartition arbitraire, et fixée à l'avance, peut être obtenue. La principale contrainte réside dans le fait que la capacité des processeurs du système ne doit pas être dépassée durant la reconfiguration.
Nous avons abordé ce problème d'ordonnancement sous différents angles. Tout d'abord, nous avons établi son caractère NP-difficile au sens fort et exhibé quelques cas particuliers polynomiaux. Puis, sur le plan de la résolution exacte dans le cas général, nous avons conçu deux algorithmes de recherche arborescente : le premier trouve ses fondements dans l'étude de la structure combinatoire du problème, le second dans des considérations polyédrales. De nombreux résultats expérimentaux illustrent la pertinence pratique de ces deux algorithmes. Enfin, en raison des contraintes imposées par le caractère temps réel de notre application industrielle, nous avons mis au point un algorithme efficace de résolution approchée basé sur la métaheuristique du recuit simulé et, en capitalisant sur nos travaux en résolution exacte, empiriquement vérifié sa capacité pratique à produire des solutions acceptables, en un sens bien défini.
Monclar, François-Régis. "Résolution coopérative de problèmes : ELICO et son application à la supervision des réseaux électriques." Montpellier 2, 1998. http://www.theses.fr/1998MON20036.
Full textAbdouli, Majeb. "Étude des modèles étendus de transactions : adaptation aux SGBD temps réel." Le Havre, 2006. http://www.theses.fr/2006LEHA0011.
Full textReal-time database systems (RTDBS) are defined as systems whose objective is not only to respect the transactions and data temporal constraints (as in real-time systems), but they also respect the logical consistency of the database (as in classical DBS). In a DBS, it is difficult to deal with real-time contraints in addition to the database logical consistency. On the other hand, real-time systems are not designed to meet transactions real-time constraints when there is a large amount of data. In the majority of previous works on RTBS, the systems are based on the flat transactions modle and the main aim is to respect the two kinds of constraints. In this model, a transaction is composed of two primitive operation : "read" and "write". If an operation fails, then the whole transaction is aborted and restarted, leading often the transaction to miss its deadline. Wa deduce from this that this model is not appropriate to RTDBS. Our contribution in this work has consisisted of developing protocols to manage the intra-transactions conflicts in both centralized and distributed environments. We've also developed an concurrency control protocol based on transaction urgency. Finally, we've proposed an hierarchical commit protocol which guarantees the uniform distributed transaction model based on imprecise computation. Each proposed protocol is evaluated and compared to the protocols proposed in the literature
Ray, Cyril. "ATLAS, une plate-forme pour la modélisation et la simulation de systèmes désagrégés." Phd thesis, Université Rennes 1, 2003. http://tel.archives-ouvertes.fr/tel-00090373.
Full textHamlaoui, Chahinez. "Modèles et algorithmes pour la gestion économique des ressources dans les réseaux interdomaines avec garantie de la qualité de services." Versailles-St Quentin en Yvelines, 2009. http://www.theses.fr/2009VERS0013.
Full textIn this work we focus on the economy in inter-domain networks. Our contributions consist of modeling the pricing problems based on concepts of game theory and our results reside in theoretical results on the existence of equilibrium, and the design of distributed algorithms for achieving them. Thus, we introduce a new pricing strategy that allows to maximize profits of operators in a cooperative environment and another one that allows them to choose the best margins in a competitive environment. We also explored the pricing problem considering the problem of the quality of services guarantees for real-time applications. We propose a new model for resource management and we present the various policies that need distributed control, taking into account the expectations of operators
Peixoto, Bax Marcello. "Une approche mixte réseaux de Pétri et modélisation orientée-objet : le formalisme OPenRT pour la modélisation de systèmes distribués temps réel." Montpellier 2, 1995. http://www.theses.fr/1995MON20194.
Full textBelmansour, Ahmed-Tidjani. "Évaluation de l'efficacité de lignes de production avec machines multi-états et stocks intermédiaires." Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/28247/28247.pdf.
Full textZoghlami, Nesrine. "Optimisation à base d’agents communicants des flux logistiques pour la gestion de crises." Ecole Centrale de Lille, 2008. http://www.theses.fr/2008ECLI0013.
Full textThe logistic chains represent a competitive advantage that companies try to maintain. Nevertheless, it is never easy to anticipate the evolution of a logistics chain. Consequently, to integrate the disturbances as a parameter into the study of the chain can allow limiting its vulnerability. The research works presented in this thesis, within the context of cooperation with the logistics department of EADS, concern the definition of a modeling approach and an oriented agent simulation of logistic chains in a context with strong disturbances (the crisis management logistics chain). However, work in an uncertain environment; incite to be equipped with cooperation mechanisms assuring all the actors of the chain satisfaction, while acting in a collective way to reach a common objective: the crisis management. To resolve this kind of problem, we defined in this thesis two interaction modes and negotiation protocols based on the cooperation between agents. These protocols, validated in a crisis management application, allow us to take into account the dependencies between the different negotiation issues. To demonstrate, the efficiency of the used approaches, we represented the variation of the bullwhip effect according to the used approach. We concluded that the cooperation is essential and allows reducing efficiently the bullwhip effect along a logistics chain. A demonstrator OBAC was realized, integrating all this approaches and military applications
N'zi, Yoboué Guillaume. "Élaboration d'une plate-forme de calculs numériques d'un modèle d'état à la base d'une approche phénoménologique : cas d'un four rotatif de clinker." Thesis, Université Laval, 2014. http://www.theses.ulaval.ca/2014/30553/30553.pdf.
Full textThis study develops a mathematical platform going from the establishment of a knowledge database to the setting up of an adaptive model. This has required a new approach of modeling of the clinker rotary kiln (CRK). Thus, a state model of distributed parameter systems, based on physico-chemical phenomena, was designed using partial differential equations. The model structure is based on three state variables which are: the gas, clinker temperatures and the clinker mass distributions, and are elaborated with the help of heat, pressure and mass balance equations. The model parameters are defined by the functions of three state variables. Moreover, the resulting state model, decomposed into five phenomenological zones of CRK, is used as a first step to define a set of Operating Functions (OFs). These OFs has also been decomposed into longitudinal distribution of CRK to replace the constant, unknown or unmeasured parameters. We develop an identification procedure based on phenomenological and dimensional analysis where the identification of operational functions (model parameters) was performed from a stationary state of the CRK. Once the restores state variables have been evaluated, the desired input (which is treated as the control of the CRK) can be more easily found by the proposed model than by simple trial and error. Moreover, the fact that the computation time, to estimate-calibrate the OFs above-mentioned, is very short, then this dynamic computation works faster than real-time. In summary, the cooperation and coordination in real-time between industrial computers and the CRK allows for an adaptable model, where each specific set of the OFs must be analyzed by its accuracy.
Mauran, Philippe. "Un modèle pour la spécification de la synchronisation à l'aide de contraintes." Montpellier 2, 1990. http://www.theses.fr/1990MON20036.
Full textDesprats, Thierry. "Conception des systèmes coopératifs : maîtrise de la complexité par modélisation de l'interaction." Toulouse 3, 1993. http://www.theses.fr/1993TOU30167.
Full textMorvan, Michel. "Algorithmes linéaires et invariants d'ordres." Montpellier 2, 1991. http://www.theses.fr/1991MON20022.
Full textSadat, Al Hosseini Reza. "Ant Colony for Optimization of Imperfect Preventive Maintenance for Multi-State Systems." Thesis, Université Laval, 2006. http://www.theses.ulaval.ca/2006/24107/24107.pdf.
Full textMasri, Aladdin. "Vers le contrôle commande distribué des systèmes de production manufacturiers : approche composant pour la prise en compte de l’architecture de communication dans la modélisation." Thesis, Ecole centrale de Lille, 2009. http://www.theses.fr/2009ECLI0012/document.
Full textManufacturing systems belong to the class of distributed discrete event systems. Their size requires distributing the software to control them on architecture of several industrial computers connected by networks. In this context, it becomes crucial to be able to evaluate the impact of a specific architecture on the manufacturing systems services both in terms of performance and quality. The performance of the underlying network can notably affect the productivity of the system. In traditional methodology proposed in literature, this aspect is not taken into account in the design stage. Thus, modeling such systems is important to verify some properties at that stage. In this thesis, we propose a component-based modeling approach with High Level Petri nets based method for modeling some network protocols in order to evaluate the manufacturing systems as being distributed systems. The selection of Petri nets is justified by their expression power with regard to the modeling of distributed and concurrent systems. Component-based approach can decrease modeling complexity and encourages genericity, modularity and reusability of ready-to-use components. This allows building new models easily and reducing the systems development cost. Moreover, this can help in better managing services and protocols and to easily change/modify a system element. Finally, this modeling enables us to evaluate discrete event systems by means of centralized simulations