Dissertations / Theses on the topic 'Contrôleur décentralisé'
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Ennajem, Cécile. "Evolution du rôle du contrôleur de gestion dans un contexte de contrôle de gestion." Phd thesis, Conservatoire national des arts et metiers - CNAM, 2011. http://tel.archives-ouvertes.fr/tel-00667925.
Full textShrit, Omar. "Automatic coordination of a quadcopters fleet using ad hoc communications." Electronic Thesis or Diss., université Paris-Saclay, 2021. http://www.theses.fr/2021UPASG108.
Full textIn this thesis, we study designing a decentralized controller for a set of quadrotors. The quadrotors are organized as a leader and followers. The leader is human-piloted, while the followers use the decentralized controller to follow the leader. The followers are autonomous and not aware of the leader’s behavior. The novelty of this thesis is to rely on inexpensive sensors such as WiFi modules to estimate the distances toward neighbors’ quadrotors. In order to design the decentralized controller, iterative learning is used and combined with supervised and imitation learning, through several phases, including logs gathering, training forward models, and designing a controller upon it. Then the controller is embedded in the followers, rendering them autonomous. The main advantage of learning methods is to shift the burden of optimization from the online tests step to the data gathering step. Therefore, making this approach is suitable for Commerical Of The Shelf (COTS) robots such as micro and nano quadrotors that do not have considerable computational resources on board. Our methods have been validated using MagicFlock, a home build framework for quadrotors swarm that extends RotorS, a Software In The Loop (SITL) simulation framework built on the top of the physics-based simulator Gazebo. Our results demonstrated that the swarm behavior is achieved when embedded on a set of quadrotors inside Gazebo using the proposed iterative learning methods with a performance similar to a flocking model that uses the absolute positions of the robots
Lacroix, Philippe. "Contrôle décentralisé pour des systèmes multi-robots coopératifs." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0030/MQ38686.pdf.
Full textBaudry, Matthieu. "Contrôle actif décentralisé des vibrations d'une plaque en appui simple." Mémoire, Université de Sherbrooke, 2004. http://savoirs.usherbrooke.ca/handle/11143/1220.
Full textBrunet, Yvonnick. "Unités d'actionneurs-capteurs colocalisées-duales pour le contrôle actif vibratoire décentralisé." Mémoire, Université de Sherbrooke, 2008. http://savoirs.usherbrooke.ca/handle/11143/1418.
Full textChakib, Hicham. "Contrôle et diagnostic décentralisés des systèmes à évènements discrets approche multi-décisionnelle." Thèse, Université de Sherbrooke, 2011. http://savoirs.usherbrooke.ca/handle/11143/1958.
Full textYakoubi, Youssef. "Deux Méthodes d'Approximation pour un Contrôle Optimal Semi-Décentralisé pour des Systèmes Distribués." Phd thesis, Université de Franche-Comté, 2010. http://tel.archives-ouvertes.fr/tel-00565898.
Full textXiao, Zijian. "Contrôle modulaire décentralisé - Application aux convertisseurs multi-phasés isolés entrelacés et magnétiquement couplés." Phd thesis, Toulouse, INPT, 2013. http://oatao.univ-toulouse.fr/10717/1/xiao.pdf.
Full textXiao, Zi Jian. ""Contrôle modulaire décentralisé - Application aux convertisseurs multi-phasés isolés entrelacés et magnétiquement couplés"." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2013. http://tel.archives-ouvertes.fr/tel-00912545.
Full textCardenas, Gonzalez Alben. "Système de contrôle pour l'intégration des sources d'énergie décentralisées au réseau local." Thèse, Université du Québec à Trois-Rivières, 2012. http://depot-e.uqtr.ca/5177/1/030309498.pdf.
Full textPhilippot, Alexandre. "Contribution au diagnostic décentralisé des systèmes à événements discrets: application aux systèmes manufacturiers." Reims, 2006. http://theses.univ-reims.fr/exl-doc/GED00000337.pdf.
Full textFault diagnosis of industrial systems is a subject that has received a great attention in the past few decades. It is defined as the process of detecting and isolating faults. Fault detection leads to a binary decision that either the system is working under normal conditions or an abnormality in its behaviour has occurred. Fault detection is followed by fault isolation, which determines the fault type, location and causes. This thesis presents a decentralized approach to realize the diagnosis of Discrete Event Systems (DES), particularly manufacturing systems with discrete sensors and actuators. This approach considers the plant as a set of elements. Each plant element is composed of an actuator and a set of sensors. The construction of the local diagnosers is based on a modular modelling of the plant elements, of the controller specifications and the temporal information about the actuators reactivity. It is a special case of an observer that carries fault information by means of labels attached to states. Diagnosers base their decisions on the sequences of observed events, on the current behavior and/or on the time delays between these events. In order to verify that the set of local diagnosers are capable to diagnose a set of faults within a bounded delay, a notion of codiagnosability must be defined. In this thesis, a timed-event-state-based diagnosability notion is defined in order to verify the diagnosability property of the set of local diagnosers. All local diagnosis decisions must be merged in order to obtain one global diagnosis decision. This fusion can be realized by a coordinator based on a set of rules. The goal of this coordinator is to solve the problem of decision conflict and/or ambiguity among local diagnosers in order to obtain a diagnosis performance equivalent to the one of the centralized diagnoser. Two examples of manufacturing applications are used to illustrate and to show the advantages and the interest of this approach. A simulation tool based on Stateflow of Matlab is constructed in order to test and validate the proposed approach on application examples
Dobrowolski, Jean. "Modélisation, contrôle/commande et certification d'un micro-réseau électrique décentralisé avec entrées exogènes aléatoires et informations contraintes." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT111/document.
Full textSince many years, the energy sector is undergoing significant changes. Awareness of global warming, the objective to use reduce greenhouse gas but also the scarcity of fossil energy, encourage the world to promote the use of more and more renewable energies. Electric microgrid are one of the opportunities new market on which Schneider Electric wants to launch.Microgrid are a scaled-down version of a national grid with specific objectives such as energy security, lower greenhouse gas emissions and so on. They are composed of several renewable sources (photovoltaic, wind for example), generators set, but also storage and consumers. They can be connected to a main grid or islanded. Since islanded microgrid are intrinsically composed of renewable producers with static converters, the natural grid inertia is particularly low compared to that of a classic grid with rotating machine. With this consideration, a load impact or a sudden drop of production due to renewable intermittency can destabilize the network and create chain reactions leading to a total grid blackout.Among the microgrids target markets, island whose electricity production is mostly provided by generators set presents the objective of improving an existing grid by adding renewable sources to production. These grid face strong communication constraints which can be difficult to establish, unreliable or non-existent. Thus, conventional microgrid commands do not allow to answer the presented problem.Objective of this thesis is to design the control algorithms of islanded microgrid without communication to ensure both frequency stability and to maximize renewable energy use.The presented work can be summarized in four main stages. First, several simulation models of microgrid subsystem will be defined for islanded microgrid analysis.These models will then be used to define control laws of a decentralized microgrid without communication. They will be used, inter alia, to compare performances of this decentralized control with a conventional centralized control.The third stage of the thesis will present the probabilistic certification of the decentralized algorithms in order to guarantee the desired performance.Finally, the work will end with simulation results and a real experimentation phase with the test on a 100 kVA microgrid to validate operation of algorithms
Blanc, Mathieu. "Sécurité des systèmes d'exploitation répartis : architecture décentralisée de méta-politique pour l'administration du contrôle d'accès obligatoire." Phd thesis, Université d'Orléans, 2006. http://tel.archives-ouvertes.fr/tel-00460610.
Full textMogos, Emmanuel Florin. "Production décentralisée dans les réseaux de distribution : étude pluridisciplinaire de la modélisation pour le contrôle des sources." Paris, ENSAM, 2005. http://www.theses.fr/2005ENAM0014.
Full textThe introduction of the new type of renewable sources of energy into the distribution networks involves new phenomena that are necessary to study in detail. Simplified modelling used in the simulation software for wide-area networks are initially presented thanks to the Causal Ordering Graph. Simplified methodology is then proposed for new generators connected to the electrical network via power electronic converters. A generic approach for the modelling and the control of the distributed sources is then proposed. We present a general modelling approach based on energy considerations in order to deduce the fundamental control law principles. This approach is then illustrated on the examples of microturbines, fuel cells and photovoltaic systems. We present then two applications of networks dynamics studies. First the problematic of the voltage regulation at the point of common connection of a distributed source is analysed. The main means for voltage regulation used in distribution networks are listed. The first one is focusing on reactive power. If this one is not sufficient it may be necessary to limit also the active power delivered by the electrical source. An optimized algorithm of voltage regulation based on both principles is presented. The second example of application is relative to a real time simulation of a microturbine connected to a LV electrical network. The control law is tested on an external real-time board and several tests are made to evaluate the behaviour during a short-circuit sequence
Vigneux, Marie-Christine. ""Recherches sur la jurisprudence relative au contrôle de la légalité des actes des autorités locales décentralisées"." Poitiers, 1990. http://www.theses.fr/1990POIT3012.
Full textThe law of 2 march 1982, as modified by the law of 22 july 1982, constitutes a breaking point in french administrative law. Indeed, the legislator distinctly lays down as a principle that localcommunities "govern themselves freely through elected councils", (amendment toarticle 72 paragraph 2 of the french constitution of 4 october 1958). The free administration granted to decentralized authorities. It is coupled with "a posteriori" control, within the limits of legality. Which translates into the possibility for the "prefect" to refer before the administrative judge a decision which he deems unlawful and request either an annulment or a stay of execution. Studies conducted on jurisprudence have highlighted the control mechanisms (part 1). In the "non-judicial" phase (chapter 1), the "perfect" enjoys extensive powers of investigation. The "judicial phase" (chapter 2) emphasizes two procedural techniques, on one hand withdrawal, and on the other hand stay of execution. Likewise, the research attempted to analyze the implementation of control mecanisms (part 2) within the framework of the new organization of local institutions (chapter 1), now elected and entrusted with the management of responsabilities. (chapter 2). Over eight years have now passed, leading to compiling a classification of judicial claims which have been due to their quantitative and qualitative significance
Rami, Guillaume. "Contrôle de tension auto adaptatif pour des productions décentralisées d'énergie connectées au réseau électrique de distribution." Grenoble INPG, 2006. https://tel.archives-ouvertes.fr/tel-00160675.
Full textVoltage fluctation problems in the distribution grid are involved by the connection of distributed generators (DG). Indeed, the productions of these generators may influence the network voltage map and the loadflow. These technical problems can lead to critical overvoltages. The current structure of the network is not adapted to a high insertion of DG. Indeed to telemetrie and communications agents are placed in the distribution grid. It is difficult to imagine solutions for voltage control using communications and measurements because of the high quantities of information and of the costs involved by these solutions. Thus, our study relates the developments of an autonomous and intelligent voltage control of such DG, using local informations. This control permit to carry out on the grid a global voltage control without DG coordination using communications. This control is able to adapt its objectives in an optimal way, to keep the voltage level between networks limits. Following the development of this control, software tests and practical tests were carried out to improve the operation of such a control on various network configurations and various productions, to prove the appliance of such a system. This work has been completed by the comparison between this local approach and a coordinated voltage control using DG
Baouab, Aymen. "Gouvernance et supervision décentralisée des chorégraphies inter-organisationnelles." Phd thesis, Université de Lorraine, 2013. http://tel.archives-ouvertes.fr/tel-00843420.
Full textArnaud, Christian. "Contribution au développement d'une chaîne de "contrôle-commande" à architecture totalement décentralisée : étude et réalisation des stations de supervision." Aix-Marseille 3, 1990. http://www.theses.fr/1990AIX30045.
Full textLe, Treust Maël. "Théorie de l'information, jeux répétés avec observation imparfaite et réseaux de communication décentralisés." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00656783.
Full textKrupa, Yann. "PrivaCIAS - Privacité selon l'intégrité contextuelle dans les systèmes agents décentralisés." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2012. http://tel.archives-ouvertes.fr/tel-00843082.
Full textMella, Elisabeth. "Contribution à la théorie de l'acte administratif local : étude sur les spécificités des actes unilatéraux décentralisés." Bordeaux 4, 1999. http://www.theses.fr/1999BOR40043.
Full textTeppoz, Laurent. "Commande d'un système de conversion de type VSC-HVDC. Stabilité - Contrôle des perturbations." Phd thesis, Grenoble INPG, 2005. http://tel.archives-ouvertes.fr/tel-00168414.
Full textplus en plus considérés dans une transmission de puissance et les convertisseurs fonctionnant
en source de tension (VSC) peuvent offrir des degrés de liberté supplémentaires, d'un intérêt
particulier dans la conception d'une commande.
Dans notre étude, les lois de commande sont synthétisées en temps discret et en appliquant
le principe de linéarisation entrée-sortie. Elles ont principalement pour objectifs de stabiliser
la puissance qui transite, d'assurer la régulation de la tension du bus continu et d'obtenir des
facteurs de puissance qui soient, au niveau de la source et de la charge, les plus élevés possible.
Pour pouvoir exploiter en pratique les commandes, il est nécessaire de les associer avec des
observateurs. Du fait que géographiquement la source de puissance et la charge sont situées de
part et d'autre d'une ligne de transmission, l'enjeu ultime de l'observation est la possibilité de
décentraliser les lois de commande. Cette décentralisation implique d'émettre des hypothèses
sur le comportement de ces deux éléments. Celles-ci font l'objet d'une étude approfondie.
Ainsi, dans cette thèse, nous développons une méthodologie de commande qui est systématique
pour les systèmes HVDC intégrant des convertisseurs VSC.
Beley, Thierry. "Estimation probabiliste par des systèmes d'observateurs décentralisés : application aux systèmes de trajectographie géographiquement répartis (problème de l'estimation de mouvement)." Lyon 1, 1998. http://www.theses.fr/1998LYO10063.
Full textBouet, Jean-Baptiste. "L'administration décentralisée du territoire : choix et perspectives ouverts sous la Cinquième République." Phd thesis, Université d'Angers, 2006. http://tel.archives-ouvertes.fr/tel-00331419.
Full textAnggraeni, Pipit. "Consensus décentralisé de type meneur/suiveur pour une flotte de robots coopératifs soumis à des contraintes temporelles." Thesis, Valenciennes, 2019. http://www.theses.fr/2019VALE0012/document.
Full textNowadays, robots have become increasingly important to investigate hazardous and dangerous environments. A group of collaborating robots can often deal with tasks that are difficult, or even impossible, to be accomplished by a single robot. Multiple robots working in a cooperative manner is called as a Multi-Agent System (MAS). The interaction between agents to achieve a global task is a key in cooperative control. Cooperative control of MASs poses significant theoretical and practical challenges. One of the fundamental topics in cooperative control is the consensus where the objective is to design control protocols between agents to achieve a state agreement. This thesis improves the navigation scheme for MASs, while taking into account some practical constraints (robot model and temporal constraints) in the design of cooperative controllers for each agent, in a fully decentralized way. In this thesis, two directions are investigated. On one hand, the convergence rate is an important performance specification to design the controller for a dynamical system. As an important performance measure for the coordination control of MASs, fast convergence is always pursued to achieve better performance and robustness. Most of the existing consensus algorithms focus on asymptotic convergence, where the settling time is infinite. However, many applications require a high speed convergence generally characterized by a finite-time control strategy. Moreover, finite-time control allows some advantageous properties but the settling time depend on the initial states of agents. The objective here is to design a fixed-time leader-follower consensus protocol for MASs described in continuous-time. This problem is studied using the powerful theory of fixed-time stabilization, which guarantee that the settling time is upper bounded regardless to the initial conditions. Sliding mode controllers and sliding mode observers are designed for each agent to solve the fixed-time consensus tracking problem when the leader is dynamic. On the other hand, compared with continuous-time systems, consensus problem in a discrete-time framework is more suitable for practical applications due to the limitation of computational resources for each agent. Model Predictive Control (MPC) has the ability to handle control and state constraints for discrete-time systems. In this thesis, this method is applied to deal with the consensus problem in discrete-time by letting each agent to solve, at each step, a constrained optimal control problem involving only the state of neighboring agents. The tracking performances are also improved in this thesis by adding new terms in the classical MPC technique. The proposed controllers will be simulated and implemented on a team of multiple Mini-Lab Enova Robots using ROS (Robotic Operating System) which is an operating system for mobile robots. ROS provides not only standard operating system services but also high-level functionalities. In this thesis, some solutions corresponding to problem of connection between multiple mobile robots in a decentralized way for a wireless robotic network, of tuning of the sampling periods and control parameters are also discussed
Marin, Pascal. "Contribution au développement d'une chaîne de "contrôle-commande" à architecture totalement décentralisée : étude et réalisation des unités fondamentales et de leurs communications." Aix-Marseille 3, 1989. http://www.theses.fr/1989AIX30045.
Full textVergnol, Arnaud. "Intégration dans le réseau électrique et le marché de l'électricité de production décentralisée d'origine renouvelable : gestion des congestions locales." Phd thesis, Ecole Centrale de Lille, 2010. http://tel.archives-ouvertes.fr/tel-00586084.
Full textLe, Treust Maël. "Théorie de l’information, jeux répétés avec observation imparfaite et réseaux de communication décentralisés." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112269/document.
Full textThis thesis is devoted to the study of mutual contributions between games theory and informationtheory and their applications to decentralized communication networks. First, game theoryprovides answers to optimization problems in which agents interact. In a game, players chooseactions and obtains gains called utilities. Assumptions about the information possessed by playersbefore play is fundamental to determine the outcome a game, also called equilibrium. When thesame game is repeated from stage to stage and the players do not observe the past actions perfectly,then the equilibrium utilities are not known. On the other hand, information theory studiesthe performance of a communicating system. Nowadays, communication networks are so densethat they can not organize around a single central operator. Game theory is appropriate to explorenew organizations of communication networks in which decisions are taken locally. At first,in Chapter 3, we study the game of power control in terms of energy efficiency, thanks to theexisting results for repeated games. Transmitters are regarded as players and choose the transmissionpower of the signal, considered as their action. The objective of a player is to choose anoptimal power for the quality of its own communication. The players do not observe the pastactions perfectly, but we show that the observation of the "signal over interference plus noiseratio" is sufficient to ensure optimal equilibrium results for the communication network. In a secondstep, we use the tools of the information theory for further study of the flow of informationamong the players. In Chapter 4, an encoder sends an extra signal to the players so that theyperfectly observe the actions chosen in the previous stage-game. The observation of players issufficiently precise to characterize the set of equilibrium utilities of the repeated game. Theseresults are, in turn, used to model new communication networks and to provide more realisticsolutions. In Chapter 5, we deepen the study of equilibrium utilities when players observe thepast actions to through an arbitrary observation channel. We show a rate region is achievablefor the multi-user channel with states which includes an encoder, two legitimate receivers andan eavesdropper. This result allows us to study the correlations over the sequences of actions agroup of players can implement while keeping it secret from an opponent player. The study ofmulti-user channels is a step towards the characterization of equilibrium utilities in a repeatedgame with imperfect monitoring
Ben, Slimen Bilel. "Conception de lois de commande structurées (hiérarchisées, décentralisées) pour les chaînes de traction pilotées." Phd thesis, Université de Nantes, 2011. http://tel.archives-ouvertes.fr/tel-00633942.
Full textMuller, Guillaume. "Utilisation de normes et de réputations pour détecter et sanctionner les contradictions - Contribution au contrôle social des interactions dans les systèmes multi-agents ouverts et décentralisés." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2006. http://tel.archives-ouvertes.fr/tel-00134755.
Full textparticulièrement vulnérables à l'introduction d'agents mal conçus ou
malveillants. Il est donc nécessaire de contrôler ces systèmes.
Dans cette thèse, nous proposons le modèle LIAR, permettant aux
agents eux-mêmes de mettre en place un contrôle des interactions des
autres agents, à l'aide d'un modèle de réputation.
Ce modèle permet d'abord aux agents de représenter les interactions
qu'ils perçoivent grâce à des engagements sociaux, ainsi que de
modéliser les règles que chaque agent doit respecter à l'aide de
normes sociales. En comparant les comportements qu'ils ont observés
aux normes dont ils ont connaissance, les agents sont capables
d'évaluer leurs pairs et d'estimer les niveaux de réputation qu'ils
leur associent. Ensuite, les agents peuvent décider des sanctions à
appliquer en s'appuyant sur les niveaux de réputation ainsi estimés.
Grâce à l'intégration des deux phases : évaluation des comportements
et décision des sanctions à appliquer, le modèle LIAR permet de
mettre en place un contrôle social des interactions entièrement
automatisé.
Diverses expérimentations ont été menées avec ce modèle dans le cadre
d'un réseau pair-à-pair, afin de montrer comment les agents contrôlent
les interactions de leurs pairs.
Dai, Jing. "Coordination du réglage de la fréquence entre plusieurs systèmes électriques non-synchrones reliés par un réseau à courant continu haute tension." Phd thesis, Supélec, 2011. http://tel.archives-ouvertes.fr/tel-00633299.
Full textVergnol, Arnaud. "Intégration dans le réseau électrique et le marché de l’électricité de production décentralisée d’origine renouvelable : gestion des congestions locales." Thesis, Ecole centrale de Lille, 2010. http://www.theses.fr/2010ECLI0014/document.
Full textDevelopment of wind generation is a mean towards global warming reduction. However, in some parts of the electrical grid, the massive integration of renewable generation can lead to congestion problems. These congestions are related to the impossibility for the power grid to transport the generation. Nowadays, congestion management methods are based on day(s)-ahead computation of generation restriction which leads to important production losses for renewables. Based on this context, it’s therefore important to develop a methodology which is optimal, reliable and non-discriminatory for renewable.In this work, the proposed congestion management method is based on corrective actions. These actions are computed in real-time using regulation loops and Petri net-based algorithms. A stability study proved that gain margins are sufficient to assure the stability of the corrective actions. The algorithm allows an optimal selection of the generators than will participate in the congestion management. This selection is based on their cost and efficiency for congestion alleviation. Simulation results using the software EUROSTAG have shown the efficiency of the method and its adaptability to different generator types. Furthermore, general conclusions on congestions costs according to different regulations on the renewable generation were obtained
Martin, Sabine. "Le contrôle a posteriori de la légalité des actes des autorités locales décentralisées : institué par les lois des 2 mars et 22 juillet 1982." Nancy 2, 1990. http://www.theses.fr/1990NAN20003.
Full textThe law of March 2nd 1982 set down the principles for establishing the unfettered administration of the various local structures by elected councils and thus radically altered the relationship between local and central government. It is the symbol of the rupture between the old and new orders. Under the old system, the prefect had the power to declare null any decision made by a local authority which he considered illegal and also to control projects which he judged inopportune. Since the passing of the defferre law, local authorities' decisions are rightfully executor as soon as they are published or officially notified and where major projects are concerned as soon as they have been communicated to the prefect. Under the new system, the prefect's powers are limited. All he can do is detect any illegalities. If he finds one, he can no longer sanction it himself by cancelling the incriminated decision, but merely inform the administrative tribunal. However, practice and jurisprudence have profoundly modified the interpretation of the roles of the prefect and the administrative tribunal just as they have also changed the conception of the legal nature and the regime of the "déferé prefectoral
Hui, Hui. "Contribution à la modélisation et au contrôle d'une matrice d'AFM." Phd thesis, Université de Franche-Comté, 2013. http://tel.archives-ouvertes.fr/tel-00827715.
Full textSambra, Andrei Vlad. "Data ownership and interoperability for a decentralized social semantic web." Thesis, Evry, Institut national des télécommunications, 2013. http://www.theses.fr/2013TELE0027/document.
Full textEnsuring personal data ownership and interoperability for decentralized social Web applications is currently a debated topic, especially when taking into consideration the aspects of privacy and access control. Since the user's data are such an important asset of the current business models for most social Websites, companies have no incentive to share data among each other or to offer users real ownership of their own data in terms of control and transparency of data usage. We have concluded therefore that it is important to improve the social Web in such a way that it allows for viable business models while still being able to provide increased data ownership and data interoperability compared to the current situation. To this regard, we have focused our research on three different topics: identity, authentication and access control. First, we tackle the subject of decentralized identity by proposing a new Web standard called "Web Identity and Discovery" (WebID), which offers a simple and universal identification mechanism that is distributed and openly extensible. Next, we move to the topic of authentication where we propose WebID-TLS, a decentralized authentication protocol that enables secure, efficient and user friendly authentication on the Web by allowing people to login using client certificates and without relying on Certification Authorities. We also extend the WebID-TLS protocol, offering delegated authentication and access delegation. Finally we present our last contribution, the Social Access Control Service, which serves to protect the privacy of Linked Data resources generated by users (e.g. pro le data, wall posts, conversations, etc.) by applying two social metrics: the "social proximity distance" and "social contexts"
Zhu-Colas, Beiting. "Using knowledge-based MAS to build a reliable structural earth model." Paris 6, 2008. http://www.theses.fr/2008PA066529.
Full textSambra, Andrei Vlad. "Data ownership and interoperability for a decentralized social semantic web." Electronic Thesis or Diss., Evry, Institut national des télécommunications, 2013. http://www.theses.fr/2013TELE0027.
Full textEnsuring personal data ownership and interoperability for decentralized social Web applications is currently a debated topic, especially when taking into consideration the aspects of privacy and access control. Since the user's data are such an important asset of the current business models for most social Websites, companies have no incentive to share data among each other or to offer users real ownership of their own data in terms of control and transparency of data usage. We have concluded therefore that it is important to improve the social Web in such a way that it allows for viable business models while still being able to provide increased data ownership and data interoperability compared to the current situation. To this regard, we have focused our research on three different topics: identity, authentication and access control. First, we tackle the subject of decentralized identity by proposing a new Web standard called "Web Identity and Discovery" (WebID), which offers a simple and universal identification mechanism that is distributed and openly extensible. Next, we move to the topic of authentication where we propose WebID-TLS, a decentralized authentication protocol that enables secure, efficient and user friendly authentication on the Web by allowing people to login using client certificates and without relying on Certification Authorities. We also extend the WebID-TLS protocol, offering delegated authentication and access delegation. Finally we present our last contribution, the Social Access Control Service, which serves to protect the privacy of Linked Data resources generated by users (e.g. pro le data, wall posts, conversations, etc.) by applying two social metrics: the "social proximity distance" and "social contexts"
Yazbeck, Jano. "Accrochage immatériel sûr et précis de véhicules automatiques." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0070/document.
Full textThis thesis deals with the platooning problem which aims to concieve a control algorithm allowing a convoy of vehicles to follow their leader's path. This path, which is initially undefined and unknown to all the following robots, is generated as the leader moves. In this thesis, we choose a local decentralized approach in which each robot of the platoon uses its local perceptions to compute its own commands aiming to achieve a stable (no oscillations) and precise (with a lateral error as small as possible) platooning. More precisely, this thesis studies the lateral behavior of a platoon's robot and introduces two controllers based on the memorization of the robot's predecessor's path. The first algorithm, Memo-LAT (Memorization and Look-Ahead Target), computes a continuous lateral command using an analytic control law. As the stability of Memo-LAT is not always guaranteed, we present NOC (Non-Oscillatory Convergence), a control algorithm which takes into account the path's curvature in the robot's lateral behavior's computation. NOC combines a geometric approach to a heuristic search method to compute a discrete command allowing the robot to follow precisely and without oscillations its predecessor's path
Moussa, Hassan. "Contribution to the Decentralized Energy Management of Autonomous AC-Microgrid." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0161/document.
Full textThis thesis deals with islanded AC microgrid that allows any integration of Distributed Energy Resources (DERs) that may provide their existing supply energy in a controlled manner to insure overall system functioning. The interconnection of a DER to a microgrid is done usually by using a Distributed Interface Converter (DIC), a general power electronics interface block, which consists of a source input converter module, a Voltage Source Inverter module (VSI), an output interface module, and the controller module. The thesis realizes several control laws based on decentralized methods. The major focus is on the Droop functions that are responsible for providing a power distribution balance between different Energy Resources connected to a microgrid. The aim is to insure system stability and better dynamic performance when sharing the power between different DGs as function to their nominal power. Developing a closed loop stability analysis is useful for studying system dynamics in order to obtain a desired transient response that allows identifying the proper loop control parameters. Power Quality enhancement in microgrids is also a purpose of this research. The reduction of harmonic distortions of the output voltage when supplying linear and non-linear loads are taken in consideration in this thesis. Further aspects will be studied about how to deal with constant power loads connected to the grid and the large perturbations exerted. This results to further research studies that deal with large-signal stability of microgrids
Langarica, ordoba Diego. "Stabilisation transitoire de systèmes de puissance : une approche unifiée." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112086/document.
Full textAn electric power system (EPS) is a complex network of electrical components used to supply, transmit and use electric power. Its final goal is to provide reliable, secure and uninterrupted service to the end-user, this means, constant voltage and frequency at all time. Nowadays, the trend in electric power production is toward an interconnected network of transmission lines linking generators and loads into large integrated systems. Actually, a power system network is considered the most complex and bigger machine ever built by man since it can span an entire continent. For this reason, improving power system transient stability is of great significance in human society, since if the stability is lost, power collapse may occur in a large populated area and serious damages will be brought to a regional economy and the consumer's comforts. Therefore, considering all issues presented before, this research work tackles the transient stabilization of a multi-machine EPS subject to network disturbances from two approaches: centralization which considers no limitation in information exchange at any point of a given network, and on the other hand, decentralization which assumes the information exchange is not available. To this end, first we introduce a novel control theory to globally stabilize non-globally linearizable triangular systems employing a nonlinear dynamic state-feedback controller, which differs from standard backstepping since the strict-feedback form is no longer required. Then, based on these new ideas, the transient stabilization problem of EPS is solved from a centralized point of view ensuring, under some conditions on the physical parameters of the system, global asymptotic stability of the operating point. Subsequently, using only local measurements available with existing technology, the previous central controller is transformed into a truly decentralized one, provided that the derivative of the active power at each generator can be suitable estimated. Performance of both controllers is tested via numerical simulations considering several fault scenarios using the 10-machine New England benchmark. In contrast to the nonlinear solutions above, we offer an observer--based methodology for decentralized stabilization of large--scale linear time--invariant systems. The originality of this work relies on the fact that each local controller is provided with available local measurements, it implements a deterministic observer to reconstruct the state of the other subsystems and uses in a certainty--equivalent way these estimates in the control law. The observers are designed following the principles of immersion and invariance. Furthermore, the class of systems to which the design is applicable is identified via a linear matrix inequality solution, from which the observer gains are obtained
Liu, Shiyu. "Decentralized Control and Estimation of a Flying Parallel Robot Interacting with the Environment." Electronic Thesis or Diss., Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0056.
Full textAerial manipulation is an emerging domain where multirotor Unmanned Aerial Vehicles (UAVs) are equipped with onboard end-effectors for grasping, transporting and manipulating objects. To enhance the payload capacity and achieve full manipulability in 3-dimensional space, a flying parallel robot (FPR) was previously proposed in which a number of UAVs are used to collectively support a passive parallel architecture. In this thesis, the estimation and control methods dealing with the interaction with the environment are addressed, which are applied to a specific FPR composed of a moving platform and a number of rigid legs attached with quadrotors actuating the system. The second main contribution of this thesis is the proposal of decentralized strategies based on onboard and intrinsic measurements of the UAVs. Experiments show the effectiveness of the proposed methods in regulating the robot configuration, achieving precise positioning tasks through teleoperation and performing contact-based interactions with an object in the environment. In addition, a detailed analysis of the wrench feasibility of the FPR is presented, allowing to compute the Available Wrench Set (AWS) of the platform and determine the optimal leg configurations maximising the wrench feasibility of the robot accordingly to specific task requirements
Chokor, Abbas. "Design of several centralized and decentralized multilayer robust control architectures for global chassis control." Thesis, Compiègne, 2019. http://www.theses.fr/2019COMP2514.
Full textGlobal Chassis Control (GCC) is crucial task in intelligent vehicles. It consists of assisting the driver by several automated functionalities especially for active safety and comfort purposes. Due to the fact that the dynamics of these functionalities are interconnected, thus the awaited performances are sometimes contradictory. Hence, the main task in GCC field is to coordinate the different Advanced Driving Assistance Systems (ADAS) to create synergies between the interconnected dynamics in order to improve the overall vehicle performance. Several powerful coordination strategies have already been developed either in the academic world or in the industrial one to manage these interconnections. Because the active safety needs are increasing from one side, and the technology that can be embedded into vehicles is evolving, an intense research and development is still involved in the field of global chassis control. This thesis analyzes di_erent dynamics interconnections and develops new several GCC strategies where the Active Front Steering, Active Differential Braking, and the Active Suspensions are coordinated - all together or partially - to improve the vehicle overall performance i.e. the rollover avoidance, the lateral stability, the driving comfort (maneuverability), and the ride comfort. Several multilayer architectures formed by three hierarchical layers are proposed. The lower layer represents the actuators implemented into the vehicle which generate their control inputs based on the orders sent from the middle layer. The middle layer is the control layer which is responsible to generate the control inputs that minimize the errors between the desired and actual vehicle state variables i.e. the yaw, side-slip, roll, pitch, and heave motions, regardless of the driving situation. The higher layer is the decision making layer. It instantly monitors the vehicle dynamics by di_erent criteria, then, it generates weighting parameters to adapt the controllers performances according to the driving conditions i.e. to improve the vehicle's maneuverability, lateral stability, rollover avoidance, and ride comfort. The proposed architectures di_er in the control and decision layers depending on the proposed embedded actuators. For instance, the decision layers di_er in the monitored criteria and the way the decision is taken (fuzzy logic or explicit relations). The control layers di_er in structure, where centralized and decentralized controllers are developed. In the centralized architecture, one single Multi-Input-Multi-Output optimal controller generates the optimal control inputs based on the Linear Parameter Varying (LPV)/H-infinity control technique. In the decentralized architecture, the controllers are decoupled, where the Super-Twisting Sliding Mode (STSM) technique is applied to derive each control input apart. The proposed architectures are tested and validated on the professional simulator « SCANeR Studio » and on a Full vehicle nonlinear complex model. Simulation shows that all architectures are relevant to the global chassis control. The centralized one is optimal, complex and overall stability is guaranteed, while the decentralized one does not guarantee the overall stability, but it is intuitive, simple, and robust
Sferlea, Elena. "L'évolution de l'administration locale : les cas de la Roumanie et de la France depuis le début des années 1990." Thesis, Paris Est, 2010. http://www.theses.fr/2010PEST2007.
Full textThis research focuses on the evolution of the local government in Romania and France since thebeginning of the 1990s. The study of different initial conditions in both countries has been followedby the analysis of the major developmental stages of the legal framework concerning localauthorities : the relatively recent accession to (for Romania) or reinforcement of (in France) theconstitutional status of the communities and the evolution of the law corpus operating the transferof competencies and resources for local communities. This analysis revealed a conception ofreforms that has many similarities, but also some different implementation. An evaluation of thelevel of decentralization achieved in the two countries has been undertaken in the light of thecriteria of the European Charter of Local Self-Government. It identified the progress made by eachcountry, but also the opportunities for improvement. In the end, it was found that beyond an initialcontext and particularities of the administrative map, beyond the different application of reforms,Romania and France show today a very similar degree of decentralization, broadly consistent withthe requirements of the Charter
Mogos, Emmanuel Florin. "Production décentralisée dans les réseaux de distribution. Etude pluridisciplinaire de la modélisation pour le contrôle des sources." Phd thesis, 2005. http://pastel.archives-ouvertes.fr/pastel-00001475.
Full textBesanger, Yvon. "VERS L'AMELIORATION DE LA SECURITE DESRESEAUX ELECTRIQUES DE PUISSANCE." Habilitation à diriger des recherches, 2006. http://tel.archives-ouvertes.fr/tel-00172945.
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