Дисертації з теми "Système à composants multiples"
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Vu, Hai Canh. "Stratégies de regroupement pour la maintenance des systèmes à composants multiples avec structure complexe." Thesis, Troyes, 2015. http://www.theses.fr/2015TROY0008/document.
In the recent decades, with a strong development of the global economy and new technologies, the structure of industrial systems is more and more complex. It can be a combination of elementary structures such as series structures, parallel structures, series-parallel structures, etc. In the literature, the most work focused on developing grouping strategies by considering series structures. This assumption is sometimes much penalized and limited the application of these strategies in reality. Therefore, the main objective of this thesis is to develop dynamic and stationary grouping strategies for the maintenance of multi-component systems with complex structure. These strategies have been developed for age-based models with non-negligible maintenance durations. In addition, dynamic conditions (dynamic context) such as maintenance opportunities, changes of the structure, etc., are considered and integrated into the maintenance scheduling.Our studies show the necessity and the difficulties of taking into account of the complex structure in the maintenance decisions. Numerical examples confirm the advantages of our maintenance strategies by comparing with other existing strategies in the literature
Chefrour, Djalel. "Plate-forme de composants logiciels pour la coordination des adaptations multiples en environnement dynamique." Phd thesis, Université Rennes 1, 2005. http://tel.archives-ouvertes.fr/tel-00011148.
pour l'adaptation de composants logiciels et pour leur coordination en environnement
dynamique.
Nous proposons une capture des mécanismes de l'adaptabilité dans un modèle de
composants générique basé sur la réflexivité et les techniques objet. Ces composants
reposent sur un service de surveillance de l'environnement et sur un intergiciel de coordination
des adaptations. La coordination inclut la gestion des dépendances entre les
composants interagissants et/ou concurrents.
En instaurant la séparation des préoccupations, notre approche facilite la tâche du
développeur à qui nous offrons des langages déclaratifs pour spécifier les politiques qui
contrôlent les adaptations des composants et leur coordination dans des scripts séparés.
Nous avons montré l'utilité de notre modèle, appelé Aceel, en l'utilisant pour développer
une application vidéo et un navigateurWeb adaptables en environnement mobile.
Zouine, Younes. "Contribution par la simulation système à l'étude des contraintes des composants optoélectroniques sur la transmission optique utilisant la technique CDMA." Limoges, 2005. http://aurore.unilim.fr/theses/nxfile/default/a2542528-1671-45c8-9ce8-76ef441c7766/blobholder:0/2005LIMO0059.pdf.
The CDMA technique (Code Division Multiple Access) is widely used in the radio cellular networks (3G). In the recent years, there has been a tendency towards the use of this technique in fibre-optic multiple access networks. This is mainly because of the large available bandwidth of the optical fibre. Associated with DWDM, this technique would indeed allow a significant increase in the number of users in the local area network without increasing in the number of fibres in the core network. It would be accompanied by a drastic cost decrease of the bit/km. This type of study is governed by the constraints bound to signal processing and the component performances. The research reported in this thesis, consists in an investigation through system simulations including the imposed constrains of the components and optoelectronic functions in response of the needs in local optical network architectures using CDMA applications. The limitations due to emission and reception blocks have been specially studied (laser + modulator, photodiodes, associated high speed electronics,…). In addition, the specific properties of optical fibre (dispersion, attenuation) has been considered in the particular case of optical access local network
Li, Zhi. "Commande optimale (en Production et Stock) de Systèmes Assemble-To-Order (ATO) avec prise en compte de demandes en composants individuels." Phd thesis, Ecole Centrale de Lille, 2013. http://tel.archives-ouvertes.fr/tel-00866378.
Dinh, Duc-Hanh. "Opportunistic Predictive Maintenance for Multi-Component Systems with Multiple Dependences." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0171.
Recently, maintenance modeling for multi-component systems with dependences (economic, stochastic, and/or structural dependences) has been extensively studied. However, most of the existing studies only consider one type of dependence since combining more than one makes the models too complicated to analyze and solve. However, in practice, several types of dependences, especially, the economic and structural dependences, may exist together in the system. To face this issue, the main objective of this thesis is to consider both economic and structural dependences in maintenance modeling and optimization for multi-component systems in framework of predictive maintenance. For this purpose, the impacts of economic and structural dependences on the maintenance cost, duration and the degradation process of the components are firstly investigated. Mathematical models for quantifying the impacts of the economic and structural dependences are then developed. Finally, a multi-level opportunistic maintenance policy is proposed to consider the impacts of these dependences between components.Due to the structural dependence between components, when a maintenance (preventive or corrective action) occurs, only few components need to be disassembled. The disassembled components are subjected to both economic and structural dependences while the non-disassembled components are subjected to only economic dependence. In that way, the proposed maintenance policy is characterized by one preventive threshold, that is used to select survival components for preventive maintenance, and two opportunistic maintenance thresholds, that are used for opportunistic maintenance. When a maintenance occurs, the first opportunistic threshold is defined to select the non-disassembled components (with only economic dependence) while the second opportunistic threshold is then developed to consider the disassembled components for opportunistic maintenance (with both economic and structural dependences). To evaluate the performance of the proposed opportunistic maintenance policy, a cost model is developed. Particle swarm optimization algorithm is then implemented to find the optimal decision variables. Finally, the proposed opportunistic maintenance policy is illustrated through a conveyor system to show its feasibility and added value in maintenance optimization framework
Tsormpatzoglou, Andreas. "Caractérisation et modélisation des composants MOS à multiples grilles nanométriques." Grenoble INPG, 2009. http://www.theses.fr/2009INPG0143.
The subject of the PhD is focused on theoretical and experimental studies ofnanoscale multi-gate Metal Oxide Semiconductor Field Effect Transistors. The theoretical part is orientated towards the derivation of analytical expressions for the potential distribution within the channel of the transistors, from which characteristic parameters ofthe transistors are derived. The final aim of the work is to obtain analytical compact expressions for the drain current, valid in aH regions of operation. First, symmetrical Double-Gate MOSFETs are studied, whereas the study of all other types of multi-gate MOSFETs (triple-gate and gate-all-around) is based on the derived model of DG MOSFETs. For the experimental part, the transfer characteristics of single-FinFETs and 5-FinFETs were measured at room temperature. For analysis of the experimental data, numerical simulations were performed to verify the theoretical speculations and optimize the device performance
Malasoma, Jean-Marc. "Dynamique complexe d'un système à attracteurs multiples." Ecully, Ecole centrale de Lyon, 1994. http://www.theses.fr/1994ECDL0025.
Belhadj, Taher Aymen. "Etude théorique et expérimentale de composants innovants à fibres optiques multiples." Thesis, Limoges, 2016. http://www.theses.fr/2016LIMO0036/document.
These research works presented in this manuscript aim at designing, simulate, manufacture and characterizing the modal converter based microstructured air-silica cane. This function represents a key element for modal multiplexers and chromatic dispersion compensators. The proposed component is based on a tapered microstructured air-silica cane « taper » which constitutes a transition between the two different fibers. The conversion is done through the excitation of a particular mode in a multimode or few mode fibers from a standard fiber. In the tapered structures, the understanding of the different theories involving the coupling between the different modes was yet necessary. A thorough study is carried to analyze the phenomenon of coupling and study the adiabatic criterion. This component is developed around an existing manufacturing technology at XLIM which based in the technique « stack and draw». Finally, we validate numerically and experimentally that principle. We succeed to excite the fundamental mode and higher order modes in a multimode fiber
Treglia, Robert. "Système automatique de caractérisation paramétrique de composants semiconducteurs." Aix-Marseille 3, 1989. http://www.theses.fr/1989AIX30065.
Hamelin, Éric. "Étude des performances d'un système CDMA à taux multiples." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq26216.pdf.
Volanschi, Eugene. "Une approche automatique à la spécialisation de composants système." Rennes 1, 1998. http://www.theses.fr/1998REN10021.
Abbes, Fatma. "Encapsulation des composants virtuels dans un système sur puce." Lorient, 2007. http://www.theses.fr/2007LORIS088.
In order to manage the system-on-a-chip (SoC) increasing complexity, a promising way consists of the reuse concept of preconceived hardware or software blocks. An important aspect of a core’s marketability is its ability to be easily integrated into a SoC since IP must be usable in many different application contexts. Integrating Intellectual Property (IP) components into SoC design requires the use of a hardware/software interface. This PhD thesis deals with interconnection design between IP cores (Intellectual Property) in a System on Chip. This work was undertaken jointly in the team “IP Design” of the L. E. S. T. E. R laboratory of the UBS and the C. E. S Group of ENIS. To increase reuse efficiency, quality and productivity of SoC designs, we propose a design approach for packaging the cycle accurate and bit accurate (CA-BA) interface of hardware IPs. Dataflow application based IP are targeted in a SoC/MPSoC design context. This approach provides an interface modelling considering communication adaptation concepts/context. Graph formalism has been established to specify data traffic considering the cycle accurate behaviour at the IP interface and system requirements. Moreover, the approach is built around two main steps: checking compatibility and interface architecture generation. To realize communication adaptation, both the software part (“driver”) and the hardware part (the interface) are generated. A communication interface architecture generator has been implemented as a CAD tool called GIC. This tool is able to choose and to configure generic interface parameters according to applications constraints and system needs through graphs models. It also generates SystemC code of the specified interface for simulation and synthesisable VHDL code for synthesis. This work has been tested on a multimedia application (“pipeline 3D”). It shows that the adopted interface is independent of the use context and that the approach can be used for automating IPs integration
Chefrour, Djalel André Françoise. "Plate-forme de composants logiciels pour la coordination des adaptations multiples en environnement dynamique." [S.l.] : [s.n.], 2005. ftp://ftp.irisa.fr/techreports/theses/2005/chefrour.pdf.
Broto, Laurent. "Support langage et système pour l'administration autonome." Phd thesis, Université Paul Sabatier - Toulouse III, 2008. http://tel.archives-ouvertes.fr/tel-00524704.
Breton, Jérôme. "États stationnaires multiples et structuration en espace dans un système photobiologique." Compiègne, 1986. http://www.theses.fr/1986COMPD022.
Omnes, Franck. "Elaboration par Lp-mocvd du système GaAs-Gainp : application aux composants." Paris 6, 1993. http://www.theses.fr/1993PA066194.
Vrigneau, Baptiste. "Système MIMO précodés optimisant la distance minimale : Etude des performances et extension du nombre de voies." Brest, 2006. http://www.theses.fr/2006BRES2033.
In wireless communications, the Multiple-Input Multiple-Ouput (MIMO) systems constitute an efficient way to significantly enhance data transmission according to two main, though antagonistic, parameters: the spectral efficiency and reliability assessed from the average binary error probability (BEP). With such systems the knowledge of the channel state information (CSI) at the transmitter side is paramount to lower reduce the BEP through différent stratégies of power allocation. Indeed, once the CSI has been fully (or perfectly) known, a linear precoder at the transmit side and a linear decoder at the receive side can be designed for subséquent association by optimizing one among the following criteria: minimum mean square error (MMSE) or the capacity. Their respective optimisations have led to a family of diagonal precoders: the MIMO system is équivalent to indépendant SISO subchannels. Recently, a new no-diagonal precoder designed within our laboratory optimizes the minimal Euclidean distance between receive symbols. This thesis work was aimed at estimating the BEP of this precoder for comparison with other methods (Alamouti's code and diagonal precoders). We demonstrated the maximal diversity order of the max¬dmin, and then gave a tight BEP approximation. Moreover, the spatial dimensions and the final cost of a MIMO device were reduced by associating of the precoder max-dmin with polarity diversity. Despite the corrélation induced by this system, the max-dmin performances are still worth being considered. We also proposed an extension of the max-dmin to more than two sub-channels in order to exploit larger MIMO systems
Ben, Jabeur Taoufik. "Techniques de raccourcissement du canal dans un système OFDM." Paris 5, 2009. http://www.theses.fr/2009PA05S011.
This thesis presents the work done within the LIPADE team at Paris Descartes University, U2S unit of the Ecole Nationale d'Ingenieurs de Tunis (ENIT) and the TSI department at Telecom-ParisTech, on the study of channel shortening techniques for OFDM systems. We start this report by a general introduction where advantages and disadvantages of OFDM systems. We recall that in OFDM system are presented. In particular, we recall that in OFDM system, the low equalization complexity is the result of using the Fourier Transform and the Guard Interval (GI) redundancy in form of cyclic prefix (CP-OFDM) or zero padding (ZP-OFDM). The presence of the GI redundancy and Fourier transform ensures the suppression of the inter-symbol interference (ISI) and the Inter-Block Interference (IBI) in the case where the GI size is larger than the channel length. Therefore, the effective flow decreases if the channel length increases (i. E. , when the GI size increases). To preserve a high effective flow, we must reduce the channel length by using channel shortening techniques. The research in this study investigates the channel shortening techniques for SISO-OFDM and MIMO OFDM systems. First, we consider the non blind shortening case (channel is known) for SISO-OFDM system. We propose an extension of some existing time domain equalizer algorithms (MMSE, MSSNR and Min-ISI) in such a way we better control the quality of the Target Impulse Response (TIR). Our extension allows also reducing the computation complexity. Next, we generalize this idea for MIMO-OFDM system. In the blind channel shortening case (channel is unknown), we propose two kinds of channel shortening algorithms : 1. Channel shortening methods based on the restoration of the GI redundancy or = and the null tones 2. Channel shortening methods based on the exploitation of the characteristics of the first emitted symbol which is known due to the use of differential modulation. To track the TEQ when the channel is time varying ; we propose to combine the last techniques by using the channel shortening criterion based on the characteristic of the first emitted symbol for the TEQ initialization and the combined restoration of the ZP redundancy and null tones for the TEQ adaptation. A new low complexity channel shortening for single block differential encoded for MIMO-OFDM system is also proposed in this report. For MISO-OFDM, we show the limits of linear channel shortening techniques and we propose a non-linear solution to overcome this problem. Finally, we conclude this report by presenting some research directions and perspectives that can extend the work done during this thesis
Nguyen, Van-Thai. "AI-based maintenance planning for multi-component systems considering different kinds of dependencies." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0070.
Maintenance planning for systems consisting of multiple components has still been a challenging problem. Particularly, mathematically describing dependencies between components is usually a complicated task, however, omitting component dependencies in maintenance modeling might result in suboptimal plans. Moreover, the number of maintenance decision variables needed to be optimized increases rapidly in the number of components, causing computational expense for optimization algorithms.To face these issues, this PhD aims to propose an artificial-intelligence-based maintenance optimization approach allowing to consider different kinds of dependencies between components (i.e., economic, stochastic, and structural dependence). Particularly, the maintenance approach integrates a deep maintenance cost model, that allows to compute maintenance costs at system level without requiring individual costs at component level (e.g., setup costs, labor costs and costs of maintaining each component), into the framework of multi-agent deep reinforcement learning, which can be applicable for large sequential decision-making problems, to optimize maintenance decisions. Moreover, a novel degradation interaction model for discrete- state components is also developed and then integrated into the proposed maintenance approach. Numerical studied are conducted on multi-component systems with different configurations under different observability scenarios to investigate the performance and the advantage as well as limits of the proposed maintenance approach
Assaad, Mohamad. "Etude Multi-couches dans le système HSDPA." Phd thesis, Télécom ParisTech, 2006. http://pastel.archives-ouvertes.fr/pastel-00001877.
Gillon, Frédéric. "Méthodologies de Conception Optimale des Composants Electromagnétiques." Habilitation à diriger des recherches, Université des Sciences et Technologie de Lille - Lille I, 2009. http://tel.archives-ouvertes.fr/tel-00734814.
Sureau, Frédéric. "Un système de composants distribué pour les réseaux de capteurs sans-fils." Mémoire, Université de Sherbrooke, 2011. http://savoirs.usherbrooke.ca/handle/11143/1597.
Yang, Hai. "Etude d’un système de fabrication agile mobile pour composants de grande taille." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20042/document.
Industrial robots, well known as flexible and agile manufacturing systems, reach their limits when dealing with very large workpieces (e.g.: very long and slender parts found in aeronautics industry). For such tasks, existing solutions are at their limits: stationary manipulator arms suffer from a too limited workspace; manipulators mounted on a vehicle are not accurate enough; classical machine-tools must be designed at mega-scale (several tens of meters). This thesis work aims at offering an innovative robotic solution that combines the ability to walk (or climb) on the workpiece (or on the tooling that supports the workpieces) together with manufacturing ability. From the topology and mobility analysis to the geometrics and kinematics modeling, as well as innovative control algorithms proposition, the proposed mobile manufacturing robots have been studied for achieving both machining and locomotion tasks. A prototype has been built to show the concept effectiveness . It is based on a parallel mechanism with actuation redundancy (8 motors for 6 degrees-of-freedom), combining motors, brakes, clamping devices and numerous position sensors. The robot can clamp itself on the manufacturing tooling, and then change its configuration to become a walking robot able to reach the next working area
Poulhiès, Marc. "Conception et implantation de système fondé sur les composants. Vers une unification des paradigmes génie logiciel et système." Phd thesis, Grenoble, 2010. http://www.theses.fr/2010GRENM009.
Software development for embedded systems has many challenges. Ln this thesis, we address those related to the interactions between the three following phases of the software development process: the design phase, the implementation phase and the validation phase. We study the design language characteristics and compilation techniques. Ln our approach, they allow the creation of both an implementation of the system and a model for this implementation. Provided that this model faithfully corresponds to the implementation, the analysis of the model can validate the implemented system. We propose a process for building a language based on software components for which the dynamic behavior is supposed to be given. We illustrate this process with a prototype called Buzz. Buzz uses Think components enriched with their operation al behavioral model in BIP. We developed a compiler for Buzz by extending the current Think compiler. Il generates both an architecture of Think components for the implementation and a BIP model for the analysis. We evaluate Buzz through two experiments. The first ex periment details the software development for an academical example on which we show the soundness of our technical choices. Think provides implementation support (compilation, optimization, deployment) and BIP allows us to verify the system's dynamic properties. The second ex periment focuses on porting to Buzz an application convention ail y developed for a sensor network radio protocol. It underlines the efficiency of our proposaI both in terms of programming language (the result is more structured and simpler than the original code) and in terms of compilation tools and verifications
Poulhiès, Marc. "Conception et Implantation de Système Fondé sur les Composants. Vers une Unification des Paradigmes Génie Logiciel et Système." Phd thesis, Université de Grenoble, 2010. http://tel.archives-ouvertes.fr/tel-00514504.
Beauvalet, Laurène. "Étude dynamique des systèmes multiples de petits corps : application au système de Pluton." Phd thesis, Observatoire de Paris, 2011. http://tel.archives-ouvertes.fr/tel-00689508.
Leroux, Philippe. "Architecture d'un système de stations de bases distribuées. Macrodiversité, agents multiples et autoconfiguration." Thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25778/25778.pdf.
Leroux, Philippe Laurent. "Architecture d'un système de stations de base distribuées : macrodiversité, agents multiples et autoconfiguration." Doctoral thesis, Université Laval, 2008. http://hdl.handle.net/20.500.11794/20355.
Beauvalet, Laurène. "Etude dynamique des systèmes multiples de petits corps : application au système de Pluton." Observatoire de Paris (1667-....), 2011. https://theses.hal.science/tel-00689508.
A system refers to a set of small bodies tied by gravitation and orbiting around their common center of mass, which orbits around the Sun. In order to deduce the value of those parameters, we have created an N-bodies numerical model. Our model includes the planetary perturbations as well as the integration of orbital motion's variationnal equations, a key feature of least-square method fitting. We applied our model to Pluto's system, which possesses features from both multiple and planetary systems. First, we have fitted our model to simulated data in order to study the evolution of the uncertainty on Nix's and Hydra's mass. We show that their mass will most probably remain unconstrained untill the arrival of New Horizons probe in the system. We also show that the effect of the polar oblateness on the orbits is cannot determined and studied the future contribution of GAIA to our knowledge of the system. Then, we have fitted our model to astrometric observations of the system. The fitting of the model to the observations has given very different masses for Nix and Hydra. Nonetheless, both in our study and the previous ones, the said masses are unconstrained enough for the results to remain coherent. The solution for the stellite's motion we then obtained has been used during our fitting of Pluto's heliocenter motion. At last, we have adapted our model to (45)Eugenia's system and have found results compatible with previous studies
Gouldieff, Céline. "Etude de l'interaction laser-matière en régime nanoseconde sous irradiations multiples : application aux composants optiques pour l’UV." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4328.
The work is devoted to laser-induced damage in the nanosecond regime at the wavelengths of 266 nm and 355 nm. The goal of this study is to understand and to analyze the processes taking place during multi-pulse irradiation causing laser-damage, on the surface and in the bulk of massive or thin-films optical materials. To this end, a laser-damage experiment was entirely set up and automated. It allows analyzing the laser-damage resistance and the ageing of these components under UV irradiation at a pulse repetition rate of 50 Hz and for a high number of laser pulses and to record systematically the most important test parameters (spatial beam profiles, energies, images of the site before and after irradiation).To better understand the physical phenomena leading to fatigue effects in the materials under multiple pulse irradiation, a model was developed allowing the discrimination of statistical effects (due to the high number of shots) from material modifications under UV irradiation. This model was confirmed by testing synthetic fused silica irradiated in the bulk. Concerning thin-film coated components, oxide mixtures were studied in collaboration with the Laser Zentrum Hannover (LZH, Germany) using a multi-parameter approach. These materials show indeed a complex behavior and remain poorly known, in particular under multi-pulse irradiation. Finally, a part of the work is dedicated to the non-destructive characterization of KDP crystals by UV-pumped photoluminescence, realized in the framework of the MegaJoule project, in collaboration with CEA Le Ripault (Monts, France)
Ndao, Papa Moussa. "Système MIMO de transmission numérique à haut débit en gamme HF (3-30 MHz)." Rennes 1, 2011. http://www.theses.fr/2011REN1S058.
This work is dedicated to the design of a MIMO system for long range digital transmission through the ionospheric channel. Within the HF band (3-30 MHz), the system is based on an original solution for which the classical space diversity, uneasy to set up in a context of decametric wavelengths, is replaced with the diversity of the transmitted polarizations. In a first step, a modelisation of ionospheric propagation is carried out to compute the theoretical capacity of several MIMO architectures under the assumption of deterministic frequency selective channels. An acceptable solution, appearing as a balanced trade off between performances and complexity, is identified: it consists in a 2x2 MIMO architecture transmitting to complementary circular polarizations. In a second part, the data block format and the selected single carrier waveform are described. All modules of signal processing at the receiver are then tested: block detection, channel estimation, frequency domain equalisation, decoding. The third step consists in the set up of the global system and the realization of preliminary tests in the laboratory in an off-line mode version of the signal processing. Finally, the operational transmission system is tested on an approximately 300 km long radio link. This experiments validate the concept of diversely polarised HF MIMO as they underline a transfer rate reaching up to 25. 6 kbps with a good quality of service. This value significantly exceeds the common standards (4. 8 to 9. 6 kbps)
Illayk, Abbas. "Évolution du nombre de composants en panne pour un système réparable non-Markovien." Lille 1, 2003. https://ori-nuxeo.univ-lille1.fr/nuxeo/site/esupversions/8a4c0b86-722d-4ea2-8464-13200e65618f.
Tiendrebeogo, Telesphore. "Système dynamique et réparti de nommage à indirections multiples pour les communications dans l'Internet." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00841591.
Bourrounet-Dubreuil, Brigitte. "Conception et développement d'un système à multiples capteurs de gaz : application en agro-industrie." Toulouse, INPT, 1998. http://www.theses.fr/1998INPT004C.
Bakassa, Traore Bala Jean-Philippe. "Apport de deux composants (valve optique et structures à puits quantiques multiples) aux projets de calcul optique numérique." Toulouse, ENSAE, 1986. http://www.theses.fr/1986ESAE0003.
Bakassa, Traore Bala Jean-Philippe. "Apport de deux composants valve optique et structures à puits quantiques multiples aux projets de calcul optique numérique." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375956676.
Mothe, Nicolas. "Composants optiques à fibres multiples : applications à la sommation opto-microonde et aux fibres microstructurées mono et multicoeurs." Limoges, 2009. https://aurore.unilim.fr/theses/nxfile/default/f0e822b2-4a8a-43d2-91ee-aa8e60c84380/blobholder:0/2009LIMO4042.pdf.
These research works presented in this manuscript aim at designing, realizing and characterizing the optical summation function of hyperfrequency signals. This operation constitutes a key element of the future phased array antennas and of the opto-hyperfrequency signal processing. The principle, commonly admitted, to realize the optical summation relies on the spatial separation of the different signals on the photodiode. This limitation aims to suppress the homo/heterodyne noises detrimental for the correct addition of the microwave signals. However, we numerically and experimentally demonstrate that this principle is not funded. The solution proposed here consists in encapsulating standard optical fibers in a silica tube and in tapering the whole to desired dimensions. A summator with 14 channels is fabricated this way. No fluctuation of the summed hyperfrequency power is observed even if the signals overlap significantly over the photodiode
Nazarpour, Hosein. "Surveillance de systèmes à composants multi-threads et distribués." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAM027/document.
Component-based design is the process leading from given requirements and a set of predefined components to a system meeting the requirements. Components are abstract building blocks encapsulating behavior. They can be composed in order to build composite components. Their composition should be rigorously defined so that it is possible to infer the behavior of composite components from the behavior of their constituents as well as global properties from the properties of individual components. It is, however, generally not possible to ensure or verify the desired property using static verification techniques such as model-checking or static analysis, either because of the state-space explosion problem or because the property can only be decided with information available at runtime (e.g., from the user or the environment). Runtime Verification (RV) is an umbrella term denoting the languages, techniques, and tools for the dynamic verification of system executions against formally-specified behavioral properties. In this context, a run of the system under scrutiny is analyzed using a decision procedure: a monitor. Generally, the monitor may be generated from a user-provided specification (e.g., a temporal-logic formula, an automaton), performs a step-by-step analysis of an execution captured as a sequence of system states, and produces a sequence of verdicts (truth-values taken from a truth-domain) indicating specification satisfaction or violation.This thesis addresses the problem of runtime monitoring multi-threaded and distributed component-based systems with multi-party interactions (CBSs). Although, neither the exact model nor the behavior of the system are known (black box system), the semantic of such CBSs can be modeled with labeled transition systems (LTSs). Inspiring from conformance testing theory, we refer to this as the monitoring hypothesis. Our monitoring hypothesis makes our approach oblivious of (i) the behavior of the CBSs, and (ii) how this behavior is obtained. We consider a general abstract semantic model of CBSs consisting of a set of intrinsically independent components whose interactions are managed by several schedulers. Using such an abstract model, one can obtain systems with different degrees of parallelism, such as sequential, multi-threaded and distributed systems. When monitoring concurrent (multi-threaded and distributed) CBSs, the problem that arises is that a global state of the system is not available at runtime, since the schedulers execute interactions even by knowing the partial state of the system. Moreover, in distributed systems the total ordering of the execution of the interaction is not observable. A naive solution to these problems would be to plug in a monitor which would however force the system to synchronize in order to obtain the sequence of global states as well as the total ordering of the executions at runtime Such a solution would defeat the whole purpose of having concurrent executions and distributed systems. We define two approaches for the monitoring of multi-threaded and distributed CBSs. In both approaches, we instrument the system to retrieve the local events of the schedulers. Local events are sent to an online monitor which reconstructs on-the-fly the set of global traces that are i) compatible with the local traces of the schedulers, and ii) suitable for monitoring purposes, in a concurrency-preserving fashion
Chartois, Yannick. "Étude paramétrique avancée de canaux SISO et MIMO en environnements complexes : application au système HiperLAN/2." Télécom Bretagne, 2005. http://www.theses.fr/2005TELB0003.
Awad, Mazen. "Le système O-MIMO utilisant un multiplexage par la technique de diversité de groupe de mode (MGDM)." Valenciennes, 2009. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/b2c89025-99d1-4157-8bfa-ce802b2249c2.
Due to its enormous bandwidth, the MMF fiber seems the only medium able to offer a broadband multiservices system in the office and "in-door" networks. A MMF network can constitute the backbone of the network which feeds the fixed-wired services (such as the data services GbE), as well as the wireless services (IEEE 802. X for example) in the whole building using a multiplexing technique. Such a technique must meet a high efficacy/cost ratio. In this work, our attention focused on the O-MIMO technique, based on aMGDMmultiplexing. This technique exploits at most the fibre bandwidth by a focused excitation and increases the fibre capacity using spatial launching and reception. We established, by a theoretical study, an analytical model of the MMF fibre for MGDM technique. We studied the best conditions of emission and reception, to improve the system quality and capacity. So, to take the real environment into account on our model, mechanical effects acting on the fiber are analytically modelled. A theoretical complete study, supported by simulations, is presented and the imperfections of the elements of the optical network are taken into account. Moreover, in order to ensure the transmission of all mixed services (baseband and radio), we proposed a model based on MGDM multiplexing with orthogonality between radio services and other services. This orthogonality is based on a difference in powers and optical frequencies between the transmitter associated with the radio service and the others. This model is demonstrated by simulation, by using VPI Systems software, for multiple users and multiple bit rates up to 5 Gb/s. This presentation is completed by our contribution to the elaboration of the specifications of an experiment
Cliche, Jean-François. "Réalisation et caractérisation de composants d'un système de communication optique à multiplexage en fréquence." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0003/NQ39343.pdf.
Menye, Jean Baptiste. "Validation de la maintenabilité et de la disponibilité en conception d'un système multi-composants." Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26578/26578.pdf.
Dieulle, Laurence. "Fiabilité d'un système de plusieurs groupes de composants avec maintenance à des instants aléatoires." Université de Marne-la-Vallée, 1999. http://www.theses.fr/1999MARN0045.
Menye, Jean-Baptiste. "Validation de la maintenabilité et de la disponibilité en conception d'un système multi-composants." Doctoral thesis, Université Laval, 2009. http://hdl.handle.net/20.500.11794/21935.
La problématique abordée dans cette thèse concerne la prise en compte et la validation, au stade de la conception, de la maintenabilité et de la disponibilité des systèmes multi composants. Chaque composant est assujetti à des défaillances aléatoires. La défaillance d'un composant entraine la défaillance du système. À chaque composant i on associe un taux de défaillance [Lambda] et une moyenne des temps techniques de réparation MTTR, . Le taux de panne est généralement obtenu à partir de bases de données disponibles ou à partir d'essais accélérés sur des prototypes physiques ou virtuels. Le MTTR, dépend de la structure du système, des types de liaisons utilisés, de l'accessibilité, de l'outillage, de la compétence du réparateur, de l'environnement, des procédures de diagnostic et de localisation des défaillances et des procédures utilisées pour effectuer les tests de bon fonctionnement. La maintenabilité et la disponibilité sont généralement validées a posteriori. Cette thèse propose des outils permettant au concepteur de prendre en compte les exigences de maintenabilité (accessibilité, modularité, testabilité...), d'estimer les M777i, , d'évaluer le MTTR du système et enfin de déterminer les MTTRi qui minimisent le MTTRi du système et qui maximisent, par le fait même, sa disponibilité. Ces outils font appel aux concepts de fiabilité, d'analyse probabiliste des systèmes, de logistique, à la conception assistée par ordinateur, aux approches de conception pour assemblage et désassemblage et aux outils de la programmation mathématique. Cette thèse aborde aussi la prise en compte du contexte d'exploitation pour atteindre le niveau de disponibilité requis. De plus en plus de constructeurs offrent des services de maintenance à leurs clients. Les contrats de services comportent généralement des articles qui spécifient le niveau de disponibilité désiré. Les conditions d'exploitation et de maintenance ont un impacte significatif sur les coûts et la disponibilité des systèmes. Cette thèse propose des modèles mathématiques pour définir la taille et la composition de l'équipe de maintenance qui permet de garantir un seuil de disponibilité du système tout en respectant des contraintes budgétaires. Ces réalisations ont fait l'objet de trois publications et plus de huit communications. Plusieurs extensions de ces travaux sont en cours de réalisation.
Bacha, Kenza. "Interaction entre les carburants diesel et biodiesel et les composants du système d'injection diesel." Thesis, Mulhouse, 2016. http://www.theses.fr/2016MULH4471.
Diesel injection system must withstand more severe operating conditions (pressure, temperature), and be compatible with the evolution of diesel fuel, such as the introduction of Fatty Acid Methyl Esters (FAME) and use of different additives, which may affect the durability of the vehicle, following the formation of deposits. The objective of this work is to understand the mechanisms of deposit formation from fuel oxidation and determine the major parameters involved in deposit-substrate interactions (surface condition, materials, geometry, temperature...). Two studies were discussed. The first study focuses on the liquid phase accelerated oxidation of Diesel fuel, FAME and mixtures (Diesel / FAME) using PetroOxy device, the oxidation kinetic was determined for the different fuels and characterization of oxidation products was carried out using the (FTIR-ATR, ATG / DTG and GC / MS). The second study was dedicated to the reproduction of deposit on different substrates (aluminum, stainless steel, PEEK, aluminum coating on gold, silcoklean coating on stainless steel) using the Micro Coking device, and characterization of the deposit obtained in each case using (FTIR-ATR, ATG / DTG, XPS and FEG). The results of this work permit to determine the impact of FAME nature and FAME concentration on fuel oxidation stability; an hypothesis was proposed to explain deposit formation
Clique, Blandine. "Synthèse d'hétérocycles azotés polyfonctionnels à l'aide de métaux de transition : nouvelle réaction à composants multiples pour la chimie combinatoire." Lyon 1, 2001. http://www.theses.fr/2001LYO10181.
Simon, Muriel. "Etude des performances d'un système de mélange-agitation fluidique : cas des jets multiples et instationnaires." Toulouse, INSA, 1992. http://www.theses.fr/1992ISAT0033.
Castelan, Anne. "Modélisation de composants d'extraction de la chaleur : application à l'optimisation de système d'électronique de puissance." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30341/document.
The replacement of hydraulic and pneumatic network embedded in aircraft by electrical network will increase the number of embedded systems to ensure the effective functioning of the aircraft. The development of an electrical aircraft will allow the reduction of production and functioning costs. It will also help ensure a better reliability of systems and will reduce the ecological impact of the aircraft circulation. This kind of plane would be lighter than a usual one. To be sure of this, it is necessary to reduce weight of embedded equipment's dedicated to management, conversion and distribution of electrical energy. The sizing and the optimization of embedded equipment's weight is a critical issue in the development of more electrical aircraft. This weight is mostly defined by heat transfer systems, when we consider the sizing of energy conversion system A lot of heat transfer system exists and are dedicated to the cooling of power converters. We selected two of these heat transfer system, in order to produce models of them. These models will be used in optimization routines. Plate fin heat sink in forced convection, and system assembly, combining heat pipe and plate fin heat sink, will be modelled during this thesis. Analytical models of these heat transfer systems will be developed, to optimize their weight and ensure a good cooling of electrical systems. Even if lots of dimensioning and optimization methods exists, dedicated to heat transfer systems, we choose to use analytical modelling. This kind of models gives an exact solution to the heat equation, to describe simple geometric and thermic configurations. Selected heat transfer systems can be simply described. The main advantage of these models is that it represents the thermal behavior of the system as a function of its geometrical parameters, materials and environmental conditions. Execution of these models is very fast and gives a precise solution of the thermal parameters of the described configuration. There is then a real interest to use this type of models to optimize weight of heat transfer systems, and then power converter
Le, guyadec Mathias. "Dimensionnement multi-physique des véhicules hybrides, de leurs composants et de la commande du système." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT071/document.
Road transportation has a huge impact on the environment. Hybrid electric vehicles (HEV) are an interesting alternative, especially for urban uses. However, HEV are complex systems to design because of the strong interaction between the component sizing, the energy management and the driving cycle.V. Reinbold previously developed a sizing methodology for HEV. The components and the energy management are simultaneously optimized to reduce the fuel consumption of the vehicle over a driving cycle. A specific electromagnetic model is used during the optimization process to describe accurately the electrical machine.As a continuation, we introduce firstly the possibility to deal with discrete variables such as the pole number of the electrical machine. Then, we develop a thermal model of the machine considering the convection exchanges around the end-windings. This analytical lumped parameter thermal network is used during the optimization process after being validated thanks to a finite element model. Uncertainty and sensitivity analysis are used to check the influence of some of the thermal parameters. Finally, the sizing methodology is applied to a series/parallel HEV including two electrical machines
Navon, Yotam. "Interaction des composants de la paroi cellulaire végétale : vers un système de modèle bio-inspiré." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALV006.
The goal of this work was to develop an in vitro model of the plant primary cell wall. A bottom up approach was chosen for the rational design of 2D and 3D constructs made of a lipid membrane, cellulose nano crystals (CNCs) and xyloglucan (XG). First, the interaction between the building blocks was probed using light scattering, isothermal titration calorimetry, quartz crystal microbalance and electron microscopy, revealing firstly the electrostatic nature of the interaction between CNCs and a lipidic membrane and secondly, specific interaction between CNCs and XG in a precise stoichiometric ratio. Then, the optimal parameters from the interaction studies were used to obtain 2D and 3D structures by depositing alternating layers of CNCs and XG on flat substrates (multilayered films) and giant unilamellar vesicles (GUVs). A linear growth of the films was revealed by atomic force microscopy (AFM) experiments while the response of decorated vesicles to osmotic shocks lead to their buckling due to the rigidification of the lipid membrane. Finally, the mechanical properties of the constructs were characterized using AFM indentation, revealing a Young's modulus of few hundred kPa, similarly to what is observed for real plant cell walls