Дисертації з теми "Contrôle de réseaux"
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Wahbi, Wassim. "Contrôle stochastique sur les réseaux." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLED072.
This thesis consists of three parts which deal with quasi linear parabolic PDE on a junction, stochastic diffusion on a junction and stochastic control on a junction with control at the junction point. We begin in the first Chapter by introducing and studying a new class of non degenerate quasi linear parabolic PDE on a junction, satisfying a Neumann (or Kirchoff) non linear and non dynamical condition at the junction point. We prove the existence and the uniqueness of a classical solution. The main motivation of studying this new mathematical object is the analysis of stochastic control problems with control at the junction point, and the characterization of the value function of the problem in terms of Hamilton Jacobi Bellman equations. For this end, in the second Chapter we give a proof of the existence of a diffusion on a junction. The process is characterized by its local time at the junction point, whose quadratic approximation is centrally related to the ellipticty assumption of the second order terms around the junction point.We then provide an It's formula for this process. Thanks to the previous results, in the last Chapter we study a problem of stochastic control on a junction, with control at the junction point. The set of controls is the set of the probability measures (admissible rules) satisfying a martingale problem. We prove the compactness of the admissible rules and the dynamic programming principle
Villain, Benjamin. "Nouvelle génération de contrôleur d'accès réseau : une approche par réseaux logiciels." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066663/document.
This thesis presents the importance of cross-layer network information for network applications in the context of network access control. The dissertation exposes a novel architecture in which a network access controller is mutualized in the Cloud. This architecture allows to address a key market segment for clients unwilling to buy expensive hardware to control their network. Multiple challenges come into play when hosting the controller remotely. Indeed cross-layer information are no longer available which prevents the controller from correctly controlling users activity. A first implementation to share cross-layer information is presented in chapter 2. It leverages specialized session border controllers to send these data in the application protocol, here HTTP. Then chapter 3 presents an innovative solution for the cross-layering problem which allows to intrumentalize network flows with SDN protocols. The solution focuses on a web portal redirection but is extendable to any kind of protocols. The implementation permits to intercept and modify flows in order to input cross-layer data within another network protocol. This solution was implemented in the OpenDaylight OpenFlow controller and shows great results. The mutualized approach coupled with the SDN cross-layer framework allow to build flexible networks with almost no configuration of on-site equipments. The central network controller reduces the overal cost of the solution by being mutualized among multiple clients. Moreover, having the ability to intrumentalize network traffic in software allows to implement any kind of custom behavior on the runtime
Villain, Benjamin. "Nouvelle génération de contrôleur d'accès réseau : une approche par réseaux logiciels." Electronic Thesis or Diss., Paris 6, 2015. http://www.theses.fr/2015PA066663.
This thesis presents the importance of cross-layer network information for network applications in the context of network access control. The dissertation exposes a novel architecture in which a network access controller is mutualized in the Cloud. This architecture allows to address a key market segment for clients unwilling to buy expensive hardware to control their network. Multiple challenges come into play when hosting the controller remotely. Indeed cross-layer information are no longer available which prevents the controller from correctly controlling users activity. A first implementation to share cross-layer information is presented in chapter 2. It leverages specialized session border controllers to send these data in the application protocol, here HTTP. Then chapter 3 presents an innovative solution for the cross-layering problem which allows to intrumentalize network flows with SDN protocols. The solution focuses on a web portal redirection but is extendable to any kind of protocols. The implementation permits to intercept and modify flows in order to input cross-layer data within another network protocol. This solution was implemented in the OpenDaylight OpenFlow controller and shows great results. The mutualized approach coupled with the SDN cross-layer framework allow to build flexible networks with almost no configuration of on-site equipments. The central network controller reduces the overal cost of the solution by being mutualized among multiple clients. Moreover, having the ability to intrumentalize network traffic in software allows to implement any kind of custom behavior on the runtime
Berqia, Amine. "Contrôle d'admission et QoS dans les réseaux mobiles et les réseaux WATM." Dijon, 2000. http://www.theses.fr/2000DIJOS003.
Paul, Olivier. "Le contrôle d'accès dans les réseaux ATM." Rennes 1, 2001. http://www.theses.fr/2001REN1A008.
Stanica, Razvan. "Contrôle de Congestion dans les Réseaux Véhiculaires." Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0130/document.
The equipment of vehicles with wireless communication devices in order to improve road safety is a major component of a future intelligent transportation system. The success and availability of IEEE 802.11-based products make this technology the main competitor for the Medium Access Control (MAC) layer used in vehicle-to-vehicle communication. The IEEE 802.11p amendment has been specially designed in this special context of wireless access in vehicular environments. However, as all the other approaches based on Carrier Sense Multiple Access (CSMA), this protocol presents scalability problems, which leads to poor performance in high density scenarios, quite frequent in the case of a vehicular ad hoc network (VANET). This thesis studies the congestion control problem in the context of safety vehicular communications, with a special focus on the back-off mechanism and the carrier sense function. First of all, a number of important characteristics presented by the safety messages are discovered and understood by the means of an analytical framework. Second, the lessons learned from the analytical study are put into practice with the design of two adaptive mechanisms (one for the contention window and the other one for the carrier sense threshold) that take into account the local vehicular density. These mechanisms remain simple, but highly efficient, while also being straightforward to integrate in IEEE 802.11 devices. Finally, by taking into account the most important properties of a safety VANET, a new CSMA-based MAC protocol is proposed. This new access method, named Safety Range CSMA (SR-CSMA), relies on the idea that collisions can not be avoided in a high density network. However, by increasing the number of simultaneous transmissions between geographically distant nodes, SR-CSMA manages to better protect the immediate neighborhood, the most important area for safety applications
Hecker, Artur. "Contrôle d'accès et gestion des réseaux 4G hétérogènes." Phd thesis, Télécom ParisTech, 2005. http://pastel.archives-ouvertes.fr/pastel-00001415.
Nguyen, Xuan Hung. "Réseaux de Communication et Applications de Contrôle-Commande." Phd thesis, INSA de Toulouse, 2011. http://tel.archives-ouvertes.fr/tel-00663316.
Hyon, Emmanuel. "Contrôle d'admission en boucle ouverte dans les réseaux." Vandoeuvre-les-Nancy, INPL, 2002. http://www.theses.fr/2002INPL108N.
Goullet, Catherine. "Le contrôle des réseaux de franchise de service." Thesis, Metz, 2011. http://www.theses.fr/2011METZ001D/document.
A franchise is defined as “a system of marketing products and/or services”, (Code of Ethics). It is characterized by three essential elements : the provision of the franchisor’s distinctive signs and trade-marks, in-house training, and supervisory services throughout the length of the contract. The franchisor grants the franchisee the right to operate a concept with the requirement that he comply with all the rules and procedures developed by the franchisor. This inter-organizational relation raises a particular interest with regard to the question of control because of two important aspects : the legal and financial independence of both parties as well as their economic interdependence. Our thesis focuses on the study of control and how it evolves throughout the franchise relationship. An exploratory study allowed us to propose a dynamic and global model of control based on the sequencing of the relationship in four phases as well as the implementation of multiple controls. To corroborate our findings, we carried out a double quantitative study of franchisors and franchisees involved in networks that market services. The results point to the existence of a dynamic approach to control throughout the relationship: with compliance verifications of operations that decrease gradually as the acquisition and mastery of know-how increases; with performance controls of the business oriented towards gaining efficiency through the provision of management tools; and with a social control that develops through the gradual integration of franchisees in the life of the network
Nguyen, Xuan hung. "Réseaux de communication et applications de contrôle-commande." Thesis, Toulouse, INSA, 2011. http://www.theses.fr/2011ISAT0025/document.
This thesis is in the field of Networked Controlled Systems, which are multidisciplinary systemsand which experience a great development in the context of the current technology andintroduce new research problems, particularly for the communities of Automatic Control andCommunication Network. The aim is to show the interest in considering a bidirectional link betweenthe Quality of Control (QoC) (stability and performance of process control applications) andQuality of Service (QoS) (delays in the transmissions) and to focus on Local Area Networks and,more particularly, on the scheduling of frames in the MAC layer in which we consider CSMAMAC protocols.Our work first concerns a CAN network where we have three proposals. The first proposalconsists of solutions for QoS, for process control applications, which are based on the conceptof hybrid priority for the frame scheduling in which we define a dynamic priority part which dependson a QoC parameter. This allows to implement a relation QoC→QoS. The second proposalconsists of QoC solutions by using a compensation method for time delays (maintenance of dominantpoles) which allows to implement a relation QoS→QoC. The third proposal consists inimplementing a relation QoS⇋QoC that ensures, for the implementation of several applications,a fairness property. We then discuss the specific context of Wireless LANs, where, on the onehand, we define collision-free CSMA MAC protocols on the basis of priorities and, on the otherhand, we show the feasibility of the ideas developed in the CAN network
Scaman, Kevin. "Etude et contrôle de phénomènes diffusifs dans un réseau." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLN039/document.
The propagation of a characteristic through a network is the subject of study of many scientific fields. Epidemics, viral marketing or information propagation through a social network are among the many examples of real phenomena modeled by the evolution of a characteristic propagating through the edges of a network. Thus, being capable of acting on these diffusion processes is of capital interest for many fields. Despite the large literature about the theoretical aspects of diffusion processes, and more specifically the discovery of an epidemic threshold under which the propagation is not sustainable, a number of practical limitations prevent the use of these studies in real-life scenarios. In this thesis, we work on reducing the distance separating theory from practice, following three distinct research directions: the generalization of theoretical results to a larger, and more realistic, class of diffusion models, the development of efficient dynamic control measures utilizing the structure of network to its advantage, and, finally, the definition of new mathematical tools bridging the gap between spatial and network approaches in epidemiology. More specifically, our work allows the rigorous analysis of the behavior of a network's characteristics when it converges, in a structural sense, to a given metric space, and could open the way to the application of control strategies on networks to spatial and macroscopic information (e.g. transportation or demographic data) about the contact network in a given population
Haro, Christophe. "Conception informatique du contrôle sans blocage d'un procédé." Tours, 2002. http://www.theses.fr/2002TOUR4024.
This thesis is concerned by a class of problems that are relevant to the analysis, design or implementation of a computer system conducting an automated manufacturing system. The first chapter introduces the architecture of the software. Chapter 2 dealt with Petri nets models. Third chapter studies the design of operating systems kernels and the scheduling problèm. The last chapter dealt with deadlocks arising in operating and production systems
Robitaille, Benoît. "Contrôle adaptatif par entraînement spécialisé de réseaux de neurones." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ35778.pdf.
Legout, Arnaud. "Contrôle de congestion multipoint pour les réseaux best effort." Nice, 2000. http://www.theses.fr/2000NICE5451.
Zebiane, Dany. "Conception d'un plan de contrôle pour les réseaux actifs." Paris, ENST, 2003. http://www.theses.fr/2003ENST0014.
In the current networks, the evolution of the services is conditioned by a slow process of standardization. The introduction of a new service thus occurs much slower than the appearance of new applications and material technologies. To face this problem, the active networks were appeared. In this thesis, i propose some solutions to answer some problems appeared during the development of functional active platforms. First, i expose the aac architecture (architecture active controllée) which consists in the decomposition of the network into three plans: transport plan, active plan and control plan. This decomposition is proposed in order to allow the separation between the control and the data transmission on the architectural level. Secondly, i carry out an extension of aac to be able to control the resources of the active network. Thirdly, i develop a prototype to validate the aac architecture and to illustrate its impact on the introduction of the new services
Djouama, Amir. "Contrôle de topologie ambiant dans les réseaux sans fil." Versailles-St Quentin en Yvelines, 2010. http://www.theses.fr/2010VERS0019.
With the evolution of the wireless communication systems and the increasing control of complexity in the material, it becomes possible to conceive network architectures dynamicaly controlable and equiped with a capacity of ambient decision. Within the framework of the thesis we propose to study and optimize the control of a network made up of mobile nodes wich communicate without infrastructure. Two levels of control will be considered, one being at the level of the lower layers while the other adresses the aspects relating to the higher layers. The dynamic control on the level of the lower layers relates to two aspects : 1- The adaptation of the topology of the network and the routing to the requests coming from the lower layers. 2- Optimization inter-layer (cross-layer) in order to use as well as possible the resources of the network and in particular the radio. The dynamic control on the level of the higher layer relates to the discovery and the adaptation of the application to the services of communications offered by the lower layers. In a second step, we study the admission control. We propose to study the local parameters of each node, wich are interesting for the continuity of sessions. An approach for admission control is given which interact lifetime of nodes and their point of attachment
Khalifé, Hicham. "Techniques de contrôle pour réseaux sans fils multi-sauts." Paris 6, 2008. http://www.theses.fr/2008PA066458.
Abdennebi, Marwen. "Réseaux cellulaires auto configurables : plan contrôle et accès usager." Versailles-St Quentin en Yvelines, 2008. http://www.theses.fr/2008VERS0017.
Mesh/ad hoc networks allow high performances and fast deployment thanks to self configuring capabilities but suffer from the lack of user mobility management and telephony support. We then propose a mixed architecture, cellular for users, and meshed for the operator. Appropriate functions related to configuration and mobility management are defined for the network. Performance evaluations were done for a WiMAX meshed infrastructure using an analytical model and under NS2 tool for ad hoc Wi-Fi and satellite networks. Then, we were interested in the cellular access between user and the base station for a good support of telephony applications. We first propose to enhance WiMAX voice support with a statistical multiple access scheme that takes advantage of the whole frame structure. Thereafter, we generalised the statistical access scheme and proposed a distributed scheduling algorithm that takes into account the downlink state. A 3 states source model was used for a refined prediction
Bouvier, Matteo. "Identification et contrôle de réseaux de régulation de gènes." Electronic Thesis or Diss., Lyon, École normale supérieure, 2023. http://www.theses.fr/2023ENSL0117.
Precise inference of Gene Regulatory Networks (GRNs) remains to this day a challenging task in the systems biology field but would allow us to explain the processes of cellular decision-making. Previous work in our team has led to the proposal of an iterative GRN inference algorithm that does not produce a single GRN but rather an ensemble of executable candidate networks. This thesis proposes a strategy for GRN selection from an ensemble that relies on design of experiments. First, we introduce two Python libraries for the storage and manipulation of the very large datasets generated by the simulation of our GRNs. These libraries control the memory footprint of large and dense matrices. Then, we propose a design of experiment strategy for selecting networks. A small number of promising perturbations is selected by topological analysis of the GRNs. Perturbations are simulated and the most discriminative is chosen. Finally, we developed an algorithm for controlling GRNs by determining the sequence of stimuli to apply to reach a desired cell state. A proof of concept is presented
Ameziane, El Hassani Abdeljebar. "Le contrôle d'accès des réseaux et grandes infrastructures critiques distribuées." Phd thesis, Toulouse, INPT, 2016. http://oatao.univ-toulouse.fr/15962/1/ameziane.pdf.
Kumar, Dinesh. "Optimisation et contrôle dans les réseaux sans-fil et informatiques." Nice, 2008. http://www.theses.fr/2008NICE4039.
This thesis deals with various optimization and control problems related to wireless access and ad hoc networks and performance modeling in computer networks. In wireless access networks, we study two different technologies: 802. 11 WLAN and 3G UMTS, both stand alone and together. With both of them together, optimal user-network association in a WLAN and UMTS `hybrid cell' is investigated. In a stand alone single WLAN cell we study non-cooperative PHY rate control and in another problem, performance analysis of a simple Fountain Codes based transport protocol. For a single UMTS cell we propose an improved channel switching policy for the downlink. In wireless ad hoc networks, we study capacity optimizing hop distance in a dense Mobile ad hoc network (MANET) and optimal next hop selection in a Vehicular ad hoc network (VANET) on a highway. Tools such as SMDP (semi-Markov Decision Process), game theory, Markov chains, renewal reward theorem, cross-layer techniques, Wald's lemma and Kalman filtering are employed to derive optimal control policies in some cases, and choice or estimation of optimal system parameters in others. In particular, globally optimal user-network association is formulated as a connection routing control problem using SMDP. Here, we obtain a stationary optimal policy possessing both `mobile-greedy' and `load-balancing' properties with a neither convex nor concave type switching curve structure. From another perspective, individually optimal user-network association is formulated within a non-cooperative game framework where the Nash equilibrium achieving association policy is observed to possess a descending staircase curve structure. Again using game theory, we demonstrate that the IEEE 802. 11 MAC protocol is inefficient under non-cooperative PHY rate control. A Markovian stochastic model is proposed for a simple Fountain Codes based transport protocol in an 802. 11 WLAN cell where analysis and simulations provide insights into choice of optimal system parameters. Cross-layer techniques are used to design a channel switching policy for 3G UMTS downlink that improves performance of TCP. For the optimal hop distance and next hop selection problems in ad hoc networks, various non-trivial structural properties and explicit expressions for optimal choice of next hop node's speed and inter-node distance are obtained. Finally, we present an innovative approach of using Kalman filtering with queueing theory based performance models in order to be able to pursue `real time' performance modeling of online computer network systems having fast changing non-stationary characteristics. In such systems, neither stationary nor transient analysis from traditional queueing theory can be practically applied to obtain real time estimates of model parameters such as service times and network delays
Harivelo, Fanilo. "Contrôle de trafic pour service privilégié sur réseaux sans fil." La Réunion, 2006. http://www.theses.fr/2006LARE0020.
Designed as an extention to wired local area networks, wireless local area networks lead to new potentials such as ubiquity. Wireless channels characteristics as well as mobility of terminais complexify thé support of Quaîity of Service in thèse networks. This disser¬tation concentrâtes on thé support of service differentiation in IEEE 802. 11-based ad hoc networks. It begins wifch thé study of thé support of service differentiation in a single hop network. The idea consists in controlling thé traffic at thé IP level according to thé net¬work state. Two types of implementation are studied: computation of thé network state by means of message exchange and estimation of thé network state by local measurements. Then, a solution to channel acccss unfairness issues is proposed. Indeed, under certain con¬figurations, channel access does not dépend solely on thé traffic load but also on thé relative position of thé nodes. The proposed solution consists in thé propagation of thé receiving state of nodes and in thé synchronization of thé beginning of 802. 11 access opération. Fi-nally, in ordcr to simphfy resources management and to reduce co-channel interférences, a hierarchical organization of thé network is proposed. It is based on a topology control or clustcring sclieme and a, channel assignaient mechanism
Jebali, Ahmed. "Contrôle de divergence dans des environnements faiblement connectés." Versailles-St Quentin en Yvelines, 2003. http://www.theses.fr/2003VERS0028.
We worked out a replication model for applications on weakly connected environments. The model has 2 characteristics: total replication active replicas. We defined the concept of the measure of an operation an a replica. The divergence is the risk assumed if there is a divergence between replicas and the shared object. The matter is then to confine the divergence in a preset bound B : the bounded divergence criterion. We must ensure 2 sufficient conditions: to find a partitioning of B in local bounds and to ensure that the divergence between the operations initiated and the their estimation does not exceed the local bound. The estimation is done by profile functions of operation traffic. The protocol carries out an optimistic control: synchronizations are initiated when it is necessary and possible. Moreover, it allows the continuity of service in case of disconnection. Sabbarus is the platform implementing the protocol
Brahimi, Belynda. "Proposition d’une approche intégrée basée sur les réseaux de Petri de Haut Niveau pour simuler et évaluer les systèmes contrôlés en réseau." Thesis, Nancy 1, 2007. http://www.theses.fr/2007NAN10095/document.
The Networked Control Systems (NCS) used in collaborative, and distributed applications are based both on identification of application requirements named Quality of Control (QoC), and on performance evaluation of network to obtain the required Quality of Service (QoS). The pluridisciplinary aspect of NCS needs the knowledge of many domains such as information theory, robotics, sensors and networks. In general, two approaches are investigated in NCS: the first one deals with the compensation of the network perturbations by using control theory (control over network). The second one adapts the network performances according to the application needs (control of network). The objective of this thesis is to propose an integrated modelling environment to represent globally the NCS behaviour by using the High Level Petri Nets (HLPN) formalism. This work considers NCS based on switched Ethernet architectures. Such communication architecture is modelled with HLPN and is evaluated according to different scheduling mechanisms and traffic load. After that, NCS model based on HLPN is proposed. This model integrates the Ethernet switch model and applicative environment of NCS: controller, process… Finally, the strategies to control the network in order to adapt the QoS according to the QoC required by the application are proposed. These strategies are achieved using priority static and Weighted Round Robin policies. The obtained results show that the scheduling mechanisms enable to improve the performance of communication system and then to improve the application performances
Karmeni, Kerim. "Rôle du contrôle dans l'innovation : le cas des réseaux de franchise." Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL12020/document.
The management of innovation is complex task in franchise network: the franchisor faces the dilemma of control its operations/innovates. Thus, our objective in this research is to analyze the impact of control system on innovation in franchise networks. In the first step (exploratory phase), we used a qualitative approach based on thematic analysis. This analysis was useful to identify the architecture control system in 8 franchise networks established in France and to understand knowledge management and innovation practices which are used in this context. In the second step (confirmatory phase), a quantitative approach based on PLS technique was adopted. The analysis of 106 outlets related to franchise networks located in France provide a support for a positive impact of control mechanisms (behavioral, outcome and social) at least on one of the three types of innovation (administrative, process and product). Moreover, we observe mediating effects of knowledge diffusion and creation in the different relationships. This is a contribution to the understanding of how control influence innovation
Ben, Fredj Mohamed Slim. "Un Contrôle d'admission pour les flots IP dans un réseau multiservices." Versailles-St Quentin en Yvelines, 2002. http://www.theses.fr/2002VERS003V.
Soni, Hardik. "Une approche modulaire avec délégation de contrôle pour les réseaux programmables." Thesis, Université Côte d'Azur (ComUE), 2018. http://www.theses.fr/2018AZUR4026/document.
Network operators are facing great challenges in terms of cost and complexity in order to incorporate new communication technologies (e.g., 4G, 5G, fiber) and to keep up with increasing demands of new network services to address emerging use cases. Softwarizing the network operations using SoftwareDefined Networking (SDN) and Network Function Virtualization (NFV) paradigms can simplify control and management of networks and provide network services in a cost effective way. SDN decouples control and data traffic processing in the network and centralizes the control traffic processing to simplify the network management, but may face scalability issues due to the same reasons. NFV decouples hardware and software of network appliances for cost effective operations of network services, but faces performance degradation issues due to data traffic processing in software. In order to address scalability and performance issues in SDN/NFV, we propose in the first part of the thesis, a modular network control and management architecture, in which the SDN controller delegates part of its responsibilities to specific network functions instantiated in network devices at strategic locations in the infrastructure. We have chosen to focus on a modern application using an IP multicast service for live video streaming applications (e.g., Facebook Live or Periscope) that illustrates well the SDN scalability problems. Our solution exploits benefits of the NFV paradigm to address the scalability issue of centralized SDN control plane by offloading processing of multicast service specific control traffic to Multicast Network Functions (MNFs) implemented in software and executed in NFV environment at the edge of the network. Our approach provides smart, flexible and scalable group management and leverages centralized control of SDN for Lazy Load Balance Multicast (L2BM) traffic engineering policy in software defined ISP networks. Evaluation of this approach is tricky, as real world SDN testbeds are costly and not easily available for the research community. So, we designed a tool that leverages the huge amount of resources available in the grid, to easily emulate such scenarios. Our tool, called DiG, takes into account the physical resources (memory, CPU, link capacity) constraints to provide a realistic evaluation environment with controlled conditions. Our NFV-based approach requires multiple application specific functions (e.g., MNFs) to control and manage the network devices and process the related data traffic in an independent way. Ideally, these specific functions should be implemented directly on hardware programmable routers. In this case, new routers must be able to execute multiple independently developed programs. Packet-level programming language P4, one of the promising SDN-enabling technologies, allows applications to program their data traffic processing on P4 compatible network devices. In the second part of the thesis, we propose a novel approach to deploy and execute multiple independently developed and compiled applications programs on the same network device. This solution, called P4Bricks, allows multiple applications to control and manage their data traffic, independently. P4Bricks merges programmable blocks (parsers/deparsers and packet processing pipelines) of P4 programs according to processing semantics (parallel or sequential) provided at the time of deployment
Rao, Ashwin. "Amélioration de la transparence et du contrôle par l'utilisateur dans les réseaux mobiles." Phd thesis, Université Nice Sophia Antipolis, 2013. http://tel.archives-ouvertes.fr/tel-00937380.
Htira, Walid. "Découverte et agrégation de topologies de réseaux: application au contrôle d'admission." Phd thesis, Université Paul Sabatier - Toulouse III, 2008. http://tel.archives-ouvertes.fr/tel-00348006.
Ammar, Doreid. "Plan de connaissance pour les réseaux sémantiques : application au contrôle d'admission." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00850153.
Alshaer, Hamada. "Gestion et contrôle de trafic prioritaire dans les réseaux IP multiservices." Paris 6, 2005. http://www.theses.fr/2005PA066564.
Couturier, Pierre. "Commande par réseaux de neurones : application au contrôle d'un préhenseur électropneumatique." Lyon, INSA, 1997. http://www.theses.fr/1997ISAL0071.
This work addresses the adaptive control of nonlinear and nonstationary systems based on neural networks. An application to the control of an electro-pneumatic gripper is presented. In a first part the characteristics of direct or indirect control schemes are described. The synthesis of a direct control scheme using "Feedback Error Learning" is extensively studied. Properties and limitations of such an approach are discussed and illustrated in simulations. The computation of feedback networks for identification and control tasks is then examined. At this end, the interest of representing neural blacks under a canonical form is emphasized. The computation method is described in details in the case of the synthesis of an indirect control scheme using the "Specialized Learning" approach. Then, we propose a general control scheme that can involve bath the previous learning approaches. Applications of such a scheme for on line control design are discussed. In a second part, several applications of neural networks in Robotics, for grasping control tasks, are presented. The general control scheme is then used in order to control the position of an electro pneumatic gripper designed with metal bellows. Different on line control strategies are examined. Advantage is taken of the flexibility of the proposed control scheme so as to take into account the physical constraints such as saturation or non-symmetrical dynamical behavior when opening and when closing the device
Roth, Sophie. "Réseaux de neurones modèles : contrôle de la différenciation axonale par micropatterns." Phd thesis, Grenoble 1, 2009. http://www.theses.fr/2009GRE10262.
In vitro neuronal networks are pertinent simple systems to approach brain computational complexity. They are even more useful when an architecture evoking the in vivo network organization can be enforced. This is why micro-patterned substrates are now widely used to force cell adhesion and growth according to a predefined topology. However, building fully controlled neuronal microcircuits requires precise supervision of the information flow between cells, which can only be achieved by inducing neuronal polarity (i. E. Axonal differentiation) in a specific direction. Although more polarity-regulating molecules are being discovered each day, they are hardly usable to create polarized networks in vitro as most patterning technologies are not compatible with protein grafting. In this PhD, our goal was to achieve full control of neural polarity by combined action of non-specific adhesion and physical constraints provided by sophisticated patterning geometries. We report here the mastering of axonal growth direction with a success close to 90\%. This result was based upon previous observations : the centrosome localization determines the axon emergence point and mechanical tension is sufficient to ensure axon formation. We coupled these results into a single pattern to constrain the centrosome position with suitable adhesive patterns and prevent axon growing on undesired positions with specific curved shapes that provide a limitation of neurite tension. These findings not only provide an important tool for creating neuronal model networks but also question the centrosome function and the mechanisms of adhesion and force transmission within neurites that have been so far neglected in favour of growth cone analysis
To, Ba Lam. "Contrôle de puissance et routage dans les réseaux ad-hoc à radio cognitive." Paris 6, 2012. http://www.theses.fr/2012PA066294.
A large number of wireless services have been introduced over the last decade to satisfy new demands of mobile users. However, the proliferation of wireless computing and communication devices make the radio spectrum overcrowded. It is revealed in the Federal Communication Commission report that many spectrum bands are used only in bounded geographical areas or over limited periods of time, and that the spectrum utilization varies from 15% to 85%. As a consequence, the Cognitive Radio Networks (CRNs) have been introduced as a new alternative wireless communication paradigm to utilize the radio spectrum more efficiently. In this dissertation, we investigate the power control and routing perspectives to enhance the network performance and power utilization in CRN. First, aiming to enhance the network performance by deploying a proper network topology for a particular communication purpose, we propose a topology deployment oriented power control scheme for cognitive radio ad-hoc network. Second, to tackle the problem of the frequent arrival and leaving of primary users which can lead to the heavy traffic overhead caused by re-routing, we propose a new approach for joint flow maintenance and power control, called flow-based power control, for cognitive radio ad-hoc network. The power control scheme targets on to utilize the power resource more efficiently by only allocating power resource to the maintained flows. Finally, we propose an application-oriented routing protocol (AORP) in cognitive radio ad-hoc network. AORP builds the route for data transmission in combination with channel selection based on the application of the node initializing the data transmission
Akkari, Samy. "Contrôle d'un système multi-terminal HVDC (MTDC) et étude des interactions entre les réseaux AC et le réseau MTDC." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC069/document.
HVDC transmission systems are largely used worldwide, mostly in the form of back-to-back and point-to-point HVDC, using either thyristor-based LCC or IGBT-based VSC. With the recent deployment of the INELFE HVDC link between France and Spain, and the commissioning in China of a three-terminal HVDC transmission system using Modular Multilevel Converters (MMCs), a modular design of voltage source converters, the focus of the scientific community has shifted onto the analysis and control of MMC-based HVDC transmission systems. In this thesis, the average value models of both a standard 2-level VSC and an MMC are proposed and the most interesting difference between the two converter technologies -the control of the stored energy in the MMC- is emphasised and explained. These models are then linearised, expressed in state-space form and validated by comparing their behaviour to more detailed models under EMT programs. Afterwards, these state-space representations are used in the modelling of HVDC transmission systems, either point-to-point or Multi-Terminal HVDC (MTDC). A modal analysis is performed on an HVDC link, for both 2-level VSCs and MMCs. The modes of these two systems are specifed and compared and the independent control of the DC voltage and the DC current in the case of an MMC is illustrated. This analysis is extended to the scope of a 5-terminal HVDC system in order to perform a stability analysis, understand the origin of the system dynamics and identify the dominant DC voltage mode that dictates the DC voltage response time. Using the Singular Value Decomposition method on the MTDC system, the proper design of the voltage-droop gains of the controllers is then achieved so that the system operation is ensured within physical constraints, such as the maximum DC voltage deviation and the maximum admissible current in the power electronics. Finally, a supplementary droop "the frequency-droop control" is proposed so that MTDC systems also participate to the onshore grids frequency regulation. However, this controller interacts with the voltage-droop controller. This interaction is mathematically quantified and a corrected frequency-droop gain is proposed. This control is then illustrated with an application to the physical converters of the Twenties project mock-up
Rochwerger, Daniel. "Contrôle paramétrique des fronts de croissance." Aix-Marseille 1, 1991. http://www.theses.fr/1991AIX11374.
Jouffroy, Guillaume. "Contrôle oscillatoire par réseau de neurones récurrents." Paris 8, 2008. http://www.theses.fr/2008PA082918.
In the control field, most of the applications need a non-oscillatory continuous control. This work focuses instead on controllers with recurrent neural networks (RNN) which generate a periodic oscillatory control. The purpose of the present work is to study stochastic optimisation methods which can be used to discover the parameters of a network so that it generates a cyclic input. First we take a look at the knowledge about biological oscillators. Tthen we describe the mathematical tools to be able to guarantee the stability oscillators. The potential of RNN, especially applied to dynamical systems being still poorly used, we propose for each method, a general detailed matrix formalization and we precise the computational complexity of the methods. We validate each method using a simple example of oscillator, and we demonstrate analytically the stability of the resulting oscillator, but also how it is robust to parameters perturbations. We then compare these different methods with these criteria and the speed of convergence. We finish this thesis with an illustration, where we take all the steps of the construction of an oscillatory neural controller, to control the axis of direction of a particular vehicle. This will let us discuss how realistic is the use of recurrent neural networks in the field of control, and propose interesting questions
Lepage, Jean-François. "Réseaux holographiques apodisants pour le contrôle modal des lasers à semi-conducteurs." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0014/MQ41945.pdf.
Basso, Gillian. "Approche à base d'agents pour l'ingénierie et le contrôle de micro-réseaux." Phd thesis, Université de Technologie de Belfort-Montbeliard, 2013. http://tel.archives-ouvertes.fr/tel-00982342.
Chaouchi, Hakima. "Contrôle de la Mobilité Universelle dans les réseaux sans fil et mobile." Paris 6, 2004. http://www.theses.fr/2004PA066048.
Guiochon, Samuel. "Modélisation et contrôle en ligne d'une polymérisation : l'apport des réseaux de neurones." Bordeaux 1, 1996. http://www.theses.fr/1996BOR10637.
Braneci, Mohamed. "Protocoles de contrôle d'erreurs pour des nouvelles architectures de réseaux de telecommunications." Paris, ENST, 1997. http://www.theses.fr/1997ENST0048.
Boukhatem, Nadia. "L'approche multi-agents pour un contrôle de congestion adaptatif de réseaux atm." Versailles-St Quentin en Yvelines, 1998. http://www.theses.fr/1998VERS0021.
Pirovano, Alain. "Contrôle d'admission et allocation de ressources dans les réseaux ATM par satellites." Paris, ENST, 2002. http://www.theses.fr/2002ENST0017.
Viéron, Jérôme. "Codage scalable et contrôle de congestion pour transmission vidéo sur réseaux hétérogène." Rennes 1, 2003. https://hal.archives-ouvertes.fr/tel-01131930.
Bricard-Vieu, Vincent. "Contrôle de topologie et qualité de service dans les réseaux ad hoc." Dijon, 2005. http://www.theses.fr/2005DIJOS056.
This thesis deals with clustering and quality of service in mobile ad hoc networks. Node mobility in such networks induces a highly dynamical topology. Robust routing protocols are then required and organization of nodes is needed. Many clustering algorithms were proposed in the literature, consisting of phases of election of cluster-heads and construction of clusters, and phases of maintenance to preserve the stability of the hierarchy. However, that algorithms generate a significant overhead, damaging the performances. To improve these performances, we propose in this thesis, algorithms consisting of spacing the signalling messages sent by the cluster-head and replacing them by an estimate of its location. Moreover, some of our algorithms propose a local election, more efficient than a global one. Using the network simulator GloMoSim, simulations are conducted to evaluate our algorithm performances and compare them with existing ones
Dumoulin, Régis. "Les configurations de contrôle au sein des réseaux interorganisationnels : une recherche exploratoire." Lille 1, 1996. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1996/50374-1996-211.pdf.
The purpose of this research is to identify and analyse the configurations of control within dynamic and stable networks. The literature investigated in the first part of the thesis presents the strategic and economic currents of thought wich define the concept of strategic networks and see how control is managed there in. Organizational control is generally admitted as being "introverted" within a stable structure. The second part of the thesis gives a precise definition of organizational control (based on w. G. Ouchi work) and seeks to adapt it to loosely-coupled systems, using agency theory as a framework. From an empirical study on six firms with network type organizational structure, this research explains the configuratio ns of control (nature and variables) in use for the coordination of partners. This work shows that two different shapes of control are associated to two types of identified strategic networks. Stable networks deal with opportunism differently from dynamic networks
Dehbi, Youssef. "Contrôle d'accès et qualité de service dans les réseaux ad hoc multimédia." Thesis, Dijon, 2010. http://www.theses.fr/2010DIJOS041.
This thesis deals with access control and quality of service (QoS) issues in ad hoc networks. In the first part, we propose enhancements of the legacy 802.11 standard which lacks of QoS. For admission control, we propose a scheduling algorithm for multimedia traffic, in which priority is provided to packets with a less strict way than the EDF algorithm, and we compare both algorithms by simulation. For access control, we propose an algorithm that tunes dynamically the contention window, and we use simulations to show improvement of fairness between stations. Then we are interested in service differentiation, and we analyze the coexistence of two service classes having their contention window evolving in different ways, and we evaluate their performances in terms of throughput and mean delay. This leads us, in the second part of this thesis, to present a complete study of service differentiation in the 802.11e amendment. We propose a general analytical framework in which we model the EDCA access scheme by Markov chains. We define and study four differentiation schemes and evaluate class performances in terms of throughput, mean delay and drop ratio. Using approximations for large networks, we derive, for a given class performance index, a simple expression of this index in the other classes. That allows us to determine the relationship between class performances, and compare the differentiation schemes even if the nature of their parameters is different. Moreover, we determine analytically and verify by simulation equivalence conditions, between differentiation schemes based on backoff time distribution, that produce the same performances in terms of throughput, mean delay and drop ratio. Then, in these conditions, we analyze the effect of backoff time distribution on jitter. Our results are important tools for decision making in order to meet QoS objectives
Kharrat, Chady. "Application des techniques de contrôle sur les réseaux de micro et nanostructures." Grenoble 1, 2009. http://www.theses.fr/2009GRE10304.
One of the most important benefits provided by M/NEMS is their ability to be fabricated in a massive way combining them into arrays. However, many problems limit the use of such systems such as control complexity, elements dispersion and couplings, non-linearities and noise sources, etc. Hence, it is crucial to take these features into consideration since the design stage, eliminating their effects or making advantage of them to make new architectures that achieve high performances. A contribution to flexible micro-structures control is developed using a large array of distributed nano-transducers. The continuous structure is then replaced by a NEMS array whose model is detailed for the first time in function of existing dispersions. Coupled arrays architectures are suggested in order to reduce the dispersions effects, enhancing by that the selectivity of the derived filters. Based on the distributed transductions scheme, a novel tuning strategy is elaborated by using modal control. The different arrays (coupled or not) can be used in sensing applications, where the measurement system is modelled depending on the used technique and on the chosen structure before improving the performances by appropriate control. A new configuration based on transduction nonlinearities is designed for variation compensation and measurement of a sensor resonance frequency allowing system complexity reduction