Tesis sobre el tema "Ethernet (système de réseau local) – Normes"
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Kabalan, Hassan. "Minimizing Time Delay between Mobiles Exchanging Data in an Industrial Wireless Network Cell". Versailles-St Quentin en Yvelines, 2013. http://www.theses.fr/2013VERS0026.
Texto completoThe purpose of this study is to discuss the exchanges between mobiles moving in an industrial environment. To reach this study, a simulation approach has been chosen in order reach this study. This novel method aimed to minimize the exchange time between mobiles within an 802. 11 cell. The first step of our study represents the main points arising from this choice. Initially, we described the main existing models of spread and constraints of radio propagation. The selection of relevant model propagation for the selected industrial site is based on several measurements in domain indoor. The implementation of the ITU Pr1238 model was performed by adjusting the parameters of the various models; we decided to select the model recommended by the ITU under reference Pr1238 as our model that is used for the industrial by the NS2 Simulator. The second step was to come up with a modified method of the DCF in order to minimize the necessary time so that all mobiles within the same cell of an 802. 11b network can exchange the shared information during their co-operation. The optimization of the exchanges time between mobiles was carried out by modifying the binary exponential aspect of the Back-off algorithm as a first phase to reduce the access time to the radio medium. Whereas in the second phase this modified and enhanced BEB method was supported by a Neural Network Function to give us precise output parameters. Those outputs will be learned by the Neural Network Function and will be used in the NS2 simulation to get the new results of the time delay to compare them with the standard BEB method results
Samson, Maxine. "Conception et configuration de réseaux TSN guidées par les modèles". Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0017.
Texto completoWe are studying the design and configuration process of real-time networks that use theTime-Sensitive Networking (TSN) standards. The IEEE 802.1 TSN working group published aset of standards which adds multiple new functionalities to the switched Ethernet standards.The goal of these new functionalities is to allow the design of deterministic Ethernet networks,which makes their use possible in the context of real-time applications.Making it possible to design deterministic Ethernet networks has a cost : the increase indesign and configuration complexity of the network. These new functionalities makes the config-uration effort needed to guarantee the respect of real-time constraints more important. Moreover,since the design process of real-time networks makes use of design tools such as network simu-lators, this increase in complexity also has an impact on them.In this thesis, we propose a tooled approach to assist the design of TSN networks whichrelies on network and software modeling and automatic generation. We first propose a networkmodeling approach for TSN networks. We then link it with a software modeling approach inorder to automatically enrich the model of the network with a model of the data streams. Usingthe data contained in this model, we propose a method to compute the configuration of theCredit-Based Shaper and Time Aware Shaper. Finally, we developed a tool which produces aset of simulation models for different network simulators aswell as configuration files for networkequipment
Méhaut, Jean-François. "Une implantation de l'architecture de système reparti OMPHALE". Lille 1, 1989. http://www.theses.fr/1989LIL10007.
Texto completoBréhon, Yannick. "Conception et ingénierie de réseaux nouvelle génération orientés Ethernet". Paris, ENST, 2007. http://www.theses.fr/2007ENST0005.
Texto completoThe increase in individual and professional customer expectations, as well as the fast technological evolutions, are leading to the design of the Next Generation Internet (NGI). Network optimization allows operators to efficiently deliver high-quality services at reduced costs. Due to the pre-eminence of Ethernet technologies at the customer premises and in the access network segment, and due to its low cost, Ethernet is a natural candidate to serve as the technology of choice of the NGI. In the metropolitan network segment, efforts have led to specifying Ethernet flavors which allow mapping client traffic into Virtual LANs. In this thesis, we investigate how to efficiently assign these VLANs to the Spanning Trees generated by Ethernet’s Spanning Tree Protocol, since this is currently the only way to perform traffic-engineering and network optimization in this network segment. In the core network segment, several initiatives aim at turning Ethernet into a GMPLS-controlled connection-oriented technology (such as Layer 2 LSPs and PBB-TE). In this thesis, a new type of connection for packet- and frame- based, connection-oriented and GMPLS-controlled technologies is introduced and studied: the bus-LSP. Both in single-layer and in multi-layer networks, it provides the operator with significant cost reduction. We provide quantification of this reduction, as well as engineering methods for efficiently deploying bus-LSPs. We also detail the control plane protocols extensions needed to manage these bus-LSPs
Georges, Jean-Philippe. "Systèmes contrôlés en réseau : évaluation de performances d'architectures Ethernet commutées". Nancy 1, 2005. http://www.theses.fr/2005NAN10145.
Texto completoIn the field of networked control systems, researches have considerably evolved since Ethernet is more and more used to substitute the traditional industrial local area networks. Even if this choice of Ethernet is justified regarding its intrinsic ability to support all the communications of the enterprise (from office to workshop), it is not suitable to assume the time constraints of distributed control applications. Contrary to the fieldbuses, the non-determinism of the medium access method used by Ethernet does not enable to guarantee strict time constraints. The contribution of this thesis is to define an analytical approach to upper-bound the end-to-end delays in networked control systems which are based on switched Ethernet architectures. Work has focused on the adaptation of the network calculus theory to these specifics environments. Within this framework, this thesis presents the modeling of an IEEE 802. 1D switch as well as a computation method of the end-to-end delays based on the increasing of the traffic burstiness. Several real experiments validate the tightness of the computed bounds. In addition to the performance evaluation, the work has also considered the Classification of Service (IEEE 802. 1D/p) and the optimization of the frames scheduling on Ethernet. Finally, this thesis shows how such a performances evaluation method can be used to scale and optimize the design of switched Ethernet architectures
Martins, Joberto Sergio Barbosa. "Un support de communication pour le système Unix/Ethernet". Paris 6, 1986. http://www.theses.fr/1986PA066125.
Texto completoMarsal, Gaëlle. "Evaluation of time performances of ethernet-based automation systems by simulation of high-level Petri nets". Cachan, Ecole normale supérieure, 2006. http://tel.archives-ouvertes.fr/tel-00162228.
Texto completoIn this work, two time performances of switched Ethernet automation systems that use a client/server cooperation model are evaluated : The response time from an occurrence of an input event to the occurrence of the corresponding output event ; The network cycle time for the scanning by a controller of the whole set of its remote inputs / outputs modules. The conjunction of three time consumption mechanisms makes both time performances variable and difficult to compute in an analytic fashion. Thus, the proposed method is based on simulation of a timed and coloured Petri net model of the dynamic behaviour of the whole automation architecture. The results which have been obtained on six benchmark architectures enabled us : To show that multi-controllers architectures using a client/server cooperation model provide faster network cycle times than those based on master/slave and producer/consumer models ; To quantify the influence of the time consumption mechanisms on these performances
Daoud, Ramez. "Wireless and wired Ethernet for intelligent transportation systems". Valenciennes, 2008. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/ace94389-4796-4b12-b00d-9d4eb917a682.
Texto completoThis study focuses on the wireless as well as the wired aspect of Intelligent Transportation Systems (ITS). The On-Board network of a future smart vehicle is designed using Switched Ethernet as a backbone. This architecture aims at minimizing the amount of wiring present in today’s cars. With the increasing demand of entertainment and connectivity, the proposed model provides the vehicle passengers with internet connection, video on-demand, voice over IP (VoIP) and video conference capabilities. Also, to help the driver, a smart real-time interactive communication scheme is developed to supply traffic information. A wireless communication model is built to support the moving entities in a light urban traffic area; the model is based on stigmergic algorithms running at the core of the system infrastructure. A WiFi model is used to supply wireless connectivity to mobile nodes in a given region. The Mobile IPv4 as well as Mobile IPv6 are tested. The mobile nodes always communicate with the central intelligence of the system to update the traffic information. The stigmergic algorithm processes this data and sends to all moving vehicles messages regarding the actual traffic map. This research focuses on the wireless aspect of the problem and optimizes the architecture to satisfy minimum packet loss in the path from the central correspondent node (CN) to the mobile nodes (MN). It is found that based on MIPv6 technique and using redundant packet transmission (burst communication) one can statistically reach satisfactory
Thaenchaikun, Chakadkit. "Economie d'énergie en réseau filaire : ingénierie de trafic et mise en veille". Phd thesis, Toulouse, INPT, 2016. http://oatao.univ-toulouse.fr/17292/1/Thaenchaikun.pdf.
Texto completoKrommenacker, Nicolas. "Heuristiques de conception de topologies réseaux : application aux réseaux locaux industriels". Nancy 1, 2002. http://docnum.univ-lorraine.fr/public/SCD_T_2002_0267_KROMMENACKER.pdf.
Texto completoIndustrial Ethernet is a controversial discussion topic mainly due to its non-determinism. Many researches focus on the improvement of Ethernet's capabilities to deliver the deterministic performance required by critical applications. Generally, that is obtained by modifying the Ethernet protocol or the traffic generated by the applications. Furthermore, the industrial context imposes a links redundancy in order to provide reliable architectures. That is why we propose to improve the switched Ethernet topology performances by optimizing the network organization at the level of the physical layer. Some graph partitioning techniques have been used in order to design optimized topologies which guarantee bounded maximum end to end delays. Two heuristics have been developed and adapted to this network design problem. The obtained results show the interest of the proposed method
Feuzeu, Kwenkeu Thierry. "Extension de réseaux locaux Ethernet avec la commutation de label". Rennes 1, 2007. ftp://ftp.irisa.fr/techreports/theses/2007/feuzeu.pdf.
Texto completoEthernet, which has tradionally been the dominant technology in local area networks, is now facing new challenges due to the recent evolutions of LANs and their applications. These challenges have highlighted the limitations of Ethernet switching, principally those concerning scalability, services, network control and performance. In this thesis, we introduce the label switching technique in Ethernet networks, as it was already the case with ATM LAN Emulation or Ethernet over MPLS. But instead of replacing Ethernet switches, we simply modify their forwarding functions. We then move the network control functions from the switches to a separate platform, where they can be better managed. As result of these modifications, the new architecture described in our proposal improves network control, services and performances, while the switches functionalities, hence their complexity, are simplified
Adoud, Houssein. "Méthodes de partitionnement de graphes pour la conception d'architectures de réseaux locaux : sous-titre". Nancy 1, 2002. http://www.theses.fr/2002NAN10285.
Texto completoThe choice of topology of a communication network is a fundamental factor during the designing phase. Nowadays the topological definition of the network and its cabling plan is done in an empirical way according to the knowledge of the network expert. Thus we propose some of algorithms enabling to find an optimal topology according the volume of exchanges between the End-points (users). Two approaches are proposed according to the kinds of applications. The first one attempts to study the plans of cabling of the industrial networks. Some algorithms based on the spectral techniques of graph partitioning are proposed. The second one concerns the optimization of the design offices network topology. An analysis, of the working processes of the company, based on the metrical techniques (DSM: Design Structure Matrix) is realized. The obtained results are analyzed by means of a networks simulation tool in order to prove the interests of our propositions
Limal, Steve. "Architectures de contrôle-commande redondantes à base d’Ethernet Industriel : modélisation et validation par model-checking temporisé". Cachan, Ecole normale supérieure, 2009. http://tel.archives-ouvertes.fr/tel-00468531/fr/.
Texto completoThis work deals with an Ethernet based protocol that specifies redundancy mechanisms. The objective is to check the specification respect to availability properties. The industrial context of this work led us to : 1) give priority to a formal method. Temporal model-checking has been selected. Indeed the protocol must be used in critical industrial control systems. Therefore a thorough verification is necessary. The protocol description depends on many temporal parameters. Consequently, a technique taking time into account has been preferred. 2) put forward a method to instantiate our model. This timed automata based model has been designed to be modular. Thus the modelling of any network architecture is possible without requiring any modelling skills from the engineer. 3) put forward abstractions in order to improve the model-checking time and memory consumption. Checked properties describe the redundancy mechanisms capability to keep communications working event in case of medium or end device failure. In order to illustrate the relevance of our proposals, we apply the method of instantiation to two types of network architecture. Then some experiments are conducted and studied
Marsal, Gaëlle y (épouse Marsal) Gaëlle Poulard. "Evaluation des performances temporelles d'architectures d'automatisation distribuées sur Ethernet par simulation d'un modèle eb réseau de Petri de haut niveau". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2006. http://tel.archives-ouvertes.fr/tel-00162228.
Texto completoPetit, Dorine. "Unification des stratégies de contrôle de réseau embarqué temps-réel reconfigurable". Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0164/document.
Texto completoThis thesis is part of a long-lasting relationship between the CRAN and the CNES since 10 years. This involves studying the pertinence of replacing the buses currently embedded in European’s launchers, by off-the-shelf switched standard Ethernet architecture. Previous works qualified Ethernet regarding two quality of service items: real time and reliability. We continue this work by validating these first results on a platform, true scale architecture reproduction which will be embedded in launchers. Then, we work on an original quality of service item, typical of the spatial requirements, called observability. The objective is to re-play the whole flight, afterwards, on ground, knowing that the launcher will not come back, and the architecture is segmented, conferring to the network the dimension of non synchronized multi-domains of observation. The synthesis of all the captures implies to guarantee that the order and the freshness of launcher control information are consistent with the specified applicative operation, and that what is observed is compliant to what really happened. Finally, we propose an over-sampling which is dynamically regulated in order to benefit from the available bandwidth without disturbing real time, reconfiguration and observability requirements
Amari, Ahmed. "Conception et validation d'AeroRing - un réseau de communication Ethernet en double anneau pour les systèmes avioniques de nouvelle génération". Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0011/document.
Texto completoThe inherent complexity and bandwidth requirement of avionics communication architecturesare increasing due to the growing number of interconnected end-systems and theexpansion of exchanged data. The Avionics Full Duplex Switched Ethernet (AFDX) has beenintroduced to provide high-speed communication (100Mbps) for new generation aircraft.However, this switched network is deployed in a fully redundant way, which leads to significantquantities of wires, and thus increases weight and integration costs. To cope with thesearising issues, integrating ring-based Ethernet network in avionics context is proposed in thisthesis as a main solution to decrease the wiring-related weight and complexity. In this context,our main objective is to design and validate a new avionic communication network, calledAeroRing, based on a Gigabit Ethernet technology and supporting a Full Duplex ring topology.To achieve this aim, first, a benchmarking of the most relevant Real-Time Ethernet (RTE)solutions supporting ring topologies vs avionics requirements has been conducted, and weparticularly assess the main Performance Indicators (PIs), specified in IEC 61784-2. Thisbenchmarking reveals that each existing RTE solution satisfies some requirements better thanothers, but there is no best solution in terms of all the requirements
Limal, Steve. "Architectures de contrôle-commande redondantes à base d'Ethernet Industriel : modélisation et validation par model-checking temporisé". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2009. http://tel.archives-ouvertes.fr/tel-00468531.
Texto completoConstantopoulos, Vassilios. "Highly variable real-time networks: an Ethernet/IP solution and application to railway trains". Doctoral thesis, Universite Libre de Bruxelles, 2006. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210864.
Texto completoDoctorat en sciences appliquées
info:eu-repo/semantics/nonPublished
Addad, Boussad. "Evaluation analytique du temps de réponse des systèmes de commande en réseau en utilisant l’algèbre (max,+)". Thesis, Cachan, Ecole normale supérieure, 2011. http://www.theses.fr/2011DENS0023/document.
Texto completoNetworked automation systems (NAS) are more and more used in industry, given the several advantages they provide like flexibility, low cost, ease of maintenance, etc. However, the use of a communication network in SCR means in essence sharing some resources and therefore strikingly impacts their time performances. For instance, a control signal does get to its destination (actuator) only after a non zero delay. So, to guarantee that such a delay is shorter than a given threshold or other time constraints well respected, an a priori evaluation is necessary before operating the SCR. In our research activities, we are interested in client/server SCR reactivity and the evaluation of their response time.Our contribution in this investigation is the introduction of a (Max,+) Algebra-based analytic approach to solve some problems, faced in the existing methods like state explosion of model checking or the non exhaustivity of simulation. So, after getting Timed Event Graphs based models of the SCR and their linear state (Max,+) representation, we obtain formulae that enables to calculate straightforwardly the SCR response times. More precisely, we obtain formulae of the bounds of response time by adopting a deterministic analysis and other formulae to calculate the probability density of response time by considering a stochastic analysis. Moreover, in our investigation we take into account every single elementary delay involved in the response time, including the end-to-end delays, due exclusively to crossing the communication network. This latter being however constituted of shared resources, making by the way the use of TEG and (Max,+) Algebra impossible, we introduce a novel approach to model the communication network. This approach brings to life a new class of Petri nets, called Conflicting Timed Event Graphs (CTEG), which enables us to solve the problem of the shared resources. We also manage to represent the CTEG dynamics using recurrent (Max,+) equations and therefore calculate the end to-end delays. An Ethernet-based network is studied as an example to apply this novel approach. Note by the way that the field of application of this approach borders largely communication networks and is quite possible when dealing with other systems.Finally, to validate the different results of our research activities and the related hypotheses, especially the maximal bound of response time formula, we carry out lots of experimental measurements on a lab facility. We compare the measures to the formula predictions and check their agreement under different conditions
Soury, Ayoub. "Approches de sûreté de fonctionnement sur Ethernet temps réel : application à une nouvelle génération d’ascenseur". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT029/document.
Texto completoThe design of a communication network with a real-time Ethernet-based security that meets the requirements of the PESSRAL standard, derived from IEC 61508, is the basis of our work. In order to achieve this goal, we implement mechanisms reducing the residual error probability and achieving Safety Integrity Levels (SIL) via a deterministic electronic system. Through a single communication channel, our system must be able to integrate critical and non-critical functions without compromising the system certification.According to this commitment, we suggest an industrial communication system based on real-time Ethernet. The proposed communication interfaces meet the requirements of responsiveness and determinism in order to guarantee the temporal constraints imposed by the process and the standard. To ensure the functional safety of the interfaces, we have proposed a "safety" overlay that implements security functions according to the concept of the black channel defined in IEC 61508. Based on these properties, we have managed to classify the Ethernet-based real-time solutions into three classes in terms of cycle time. The overlay "safety", based on the redundancy of data, made it possible to give up the solution of physical redundancy. This data redundancy duplicates the initial cycle time of the network, which nonetheless satisfies the security and time conditions of the standard
Cordova, David. "Étude et réalisation d’une chaîne de conversion de données pour liaisons numériques à très haut débit". Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0269.
Texto completoThe increasing demand of higher data rates in datacenters has led tonew emerging standards (100 - 400G Ethernet and others) in wireline communications. These standards will favor more sophisticated encodings that use less frequency bandwidth. As speed requirements become more stringent, pure analog architectures can not meet them. So, a natural shift towards mixed-signal architectures is expected.This thesis proposes the design of an ADC-based receiver architecture. It uses a design methodology to define and validate the requirements and specifications for silicon-based wireline receivers that comply with >100Gb/s operation over transmission channels with high losses (>20dB). A prototype in 22nm CMOS FDSOI technology is proposed as proof of concept
Robert, Jérémy. "De l'usage d'architectures Ethernet commutées embarquées dans les lanceurs spatiaux". Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0128.
Texto completoCurrent space launchers, and particularly Ariane 5, use the deterministic network MIL-STD-1553B. According to the new objectives of cost and system mass reduction and of multimedia traffic support, this technology is not optimal anymore. Among the potential candidates, this thesis highlights the fact that such objectives can be achieved through the use of Ethernet standard based on components-on-the-shelf. The first contribution focuses on time performance evaluation of switched architectures. The gain and limits related to the communication mode (from master/slaves to producers/consummers) and future avionic distribution are studied. This study relies on a deterministic evaluation of the end-to-end delay by using network calculus, simulations and experiments. These results are validated with two switched architectures by using a scenario considered as representative of current flights. The second contribution is the network availability improvement. A real-time path reconfiguration strategy is proposed through active network supervision. Based on critical requirements, it is also suggested to use multiple spanning-trees for anticipating network element failures. The last contribution deals with the issue that in switched and segmented architectures it is not possible to collect all the traffic as in a bus. In order to do so, this thesis introduces the configurations under which a clock synchronization protocol could contribute to generate a single network trace from many collecting points. This work will enable to identify the tests for a future Ethernet standard validation in the framework of space launchers
Cros, Olivier. "Mixed criticality management into real-time and embedded network architectures : application to switched ethernet networks". Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1033/document.
Texto completoMC (Mixed-Criticality) is an answer for industrial systems requiring different network infrastructures to manage informations of different criticality levels inside the same system. Our purpose in this work is to find solutions to integrate gls{MC} inside highly constrained industrial domains in order to mix flows of various criticality levels inside the same infrastructure. This integration induces isolation constraints : the impact of non-critical traffic on critical traffic must be characterized and bounded. This a condition to respect timing constraints. To analyze transmission delays and focus on the determinism of transmissions, we use an end-to-end delay computation method called the trajectory approach. In our work, we use a corrected version of the trajectory approach taking into account the serialization of messages.To assure the respect of timing constraints in mixed critical networks, we first present a theoretical model of gls{MC} representation. This model is issued from gls{MC} tasks scheduling on processors. This model proposes a flow modelization which considers that each flow can be of one (low critical flows) or several criticality levels.To integrate gls{MC} inside gls{RT} networks, we propose two network protocols. The first is the centralized protocol. It is structured around the definition of a central node in the network, which is responsible for synchronizing the criticality level switch of each node through a reliable multicast protocol in charge of switching the network criticality level. This centralized protocol proposes solutions to detect the needs to change the criticality levels of all nodes and to transmit this information to the central node. The second protocol is based on a distributed approach. It proposes a local gls{MC} management on each node of a network. Each node individually manages its own internal criticality level. This protocol offers solutions to preserve when possible non-critical network flows even while transmitting critical flows in the network through weak isolation.In order to propose an implementation of these protocols inside Ethernet, we describe how to use Ethernet 802.1Q header tag to specify the criticality level of a message directly inside the frame. With this solution, each flow in the network is tagged with its criticality level and this information can be analyzed by the nodes of the network to transmit the messages from the flow or not. Additionnally, for the centralized approach, we propose a solution integrating gls{MC} configuration messages into gls{PTP} clock-synchronization messages to manage criticality configuration information in a network.In this work, we designed a simulation tool denoted as gls{ARTEMIS} (Another Real-Time Engine for Message-Issued Simulation). This tool is dedicated to gls{RT} networks analysis and gls{MC} integration scheduling scenarios. This tool, based on open and modular development guidelines, has been used all along our work to validate the theoretical models we presented through simulation. We integrated both centralized and decentralized protocols inside gls{ARTEMIS} core. The obtained simulations results allowed us to provide information about the gls{QOS} guarantees offered by both protocols. Concerning non-critical traffic : the decentralized protocol, by permitting specific nodes to stay in non-critical nodes, assures a highest success ratio of non-critical traffic correct transmission.As a conclusion, we propose solutions to integrate gls{MC} inside both industrial and gls{COTS} Ethernet architectures. The solutions can be either adapted to clock-synchronized or non clock-synchronized protocols. Depending on the protocol, the individual configuration required by each switch can be reduced to adapt these solutions to less costly network devices
Abriat, Patrick. "Conception et réalisation d'un système multi-agent de robotique permettant de récupérer les erreurs dans les cellules flexibles". Compiègne, 1991. http://www.theses.fr/1991COMPD411.
Texto completoLy, Khadijetou. "Étude de faisabilité d'une liaison haut débit sur fibre optique à base de VCSEL à 850 nm pour application avionique". Toulouse, ISAE, 2008. http://www.theses.fr/2008ESAE0014.
Texto completoAhmed, Nacer Abdelaziz. "Analyse et dimensionnement de réseaux hétérogènes embarqués". Phd thesis, Toulouse, INPT, 2018. http://oatao.univ-toulouse.fr/20115/1/AHMEDNACER_Abdelaziz.pdf.
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