Tesis sobre el tema "Simulation de processus distribués"
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Aliouat, Makhlouf. "Reprise de processus dans un environnement distribué après pannes matérielles transitoires ou permanentes". Phd thesis, Grenoble INPG, 1986. http://tel.archives-ouvertes.fr/tel-00320133.
Texto completoRafaralahy, Hugues. "Modélisation d'un processus thermique et reconstruction de l'état et des défauts pour une classe de systèmes à paramètres distribués de type parabolique". Nancy 1, 1993. http://www.theses.fr/1993NAN10223.
Texto completoTrieu, Thanh Ngoan. "Open data and environment simulation : environmental and social simulation on distributed process systems based on irregular cell space". Electronic Thesis or Diss., Brest, 2024. http://www.theses.fr/2024BRES0047.
Texto completoThe combination of Cellular automata (CA) and distributed systems provide a simple way to model environmental and social issues by dividing the relevant areas into discrete spatial segments for parallel computation. The state evolution of each segment is divided into discrete time steps. Geographic divisions as irregular cell space give a chance to take advantage of Open Data in feeding the simulation systems. Data are analyzed to deduce the transition rules bringing distributed influences in a neighborhood. A case study of epidemic propagation modeling based on geographic divisions is presented. Given an assumption that the epidemic is spreading to people living in the neighborhood, a simulation system is generated based on adjacent neighbors with initial conditions collected from the government open data portal. A hybrid approach is introduced with the cooperation between regular tiles and irregular cellspaces in modeling shore activities. Environmental simulation is needed to represent ground and sea characteristics modeling spreading occurring on both spaces. These characteristics are very different due to soil capability and reaction, and sea behavior, in particular currents and tides. The problem of green tides is modeled when nutrients arepresented in high concentrations and entrapped by tidal currents
Gnouma, Raouf. "Aide à la calibration d'un modèle hydrologique distribué au moyen d'une analyse des processus hydrologiques : application au bassin versant de l'Yzeron". Lyon, INSA, 2006. http://theses.insa-lyon.fr/publication/2006ISAL0084/these.pdf.
Texto completoThe present work is a contribution to the recent research topics in hydrology devoted to the amelioration of hydrological modelling performance on the base of field knowledge. The study catchment is the Yzeron basin (A = 147,3 km²) located at the west of Lyon. Following a state of the art review concerning hydrological processes for runoff generation and distributed hydrological modelling, the WISTOO model was implemented in the Yzeron basin. This first work of modelling raised the different problems of the distributed hydrological modelling, already evoked in the literature, and stresses the importance of knowledge about the hydrological behaviour of the study catchment is necessary. In the second part of this work, a spatial analysis was carried out, using the different available thematic layers, leading to the selection of three representative sub-catchments. A field experimental approach has been conducted at two scales : catchment (runoff-rainfall analysis and geochemical tracing) and hillslope scale (piezometric level measurements). The geochemical tracing application has made it possible to propose some hypotheses on the hydrological behaviour of these entities. For a smaller scale approach, a set of piezometers have been installed on two hillslopes, which allowed monitoring of the piezometric level during some rainfall-runoff events. Association of two techniques (geochemical tracing and experimental investigation at the hillslope scale) and global rainfall-runoff analysis have finally permitted to improve our understanding of dominant hydrological processes associated to the representatives sub-catchments of Yzeron basin. A first tentative of integration of this knowledge in to the calibration process of WISTOO model constitutes the last chapter of this work
Cauffriez, Laurent. "Méthodes et modèles pour l'évaluation de la sûreté de fonctionnement de systèmes automatisés complexes : Application à l'exploitation de lignes de production - Application à la conception de systèmes intelligents distribués". Habilitation à diriger des recherches, Université de Valenciennes et du Hainaut-Cambresis, 2005. http://tel.archives-ouvertes.fr/tel-00289414.
Texto completoNous présentons dans cette Habilitation à Diriger les Recherches le concept de systèmes automatisés sûrs de fonctionnement et procédons à une analyse de la problématique globale de la conception de tels systèmes. Nous identifions clairement les frontières des différents systèmes constituant les systèmes automatisés sûrs de fonctionnement : processus physique, systèmes d'automatisation, systèmes de sécurité, systèmes de contrôlabilité du risque (barrières). Pour ce faire, nous nous appuyons sur la notion de service rendu.
Nous introduisons ensuite les différents concepts de sûreté de fonctionnement des systèmes en dégageant deux grands niveaux : la sûreté de fonctionnement prédictive et la gestion de la sûreté de fonctionnement avec prise en compte des risques pour l'Homme et l'environnement. Cette étude aborde les aspects normatifs incontournables pour les systèmes industriels et décline notre point de vue sur la notion de complexité. L'identification de ces grands axes de recherche en conception des systèmes automatisés sûrs de fonctionnement nous permet de situer dans la communauté scientifique nos activités de recherche, dont les contributions et résultats sont présentés dans le mémoire selon deux axes :
• L'axe I porte sur la sûreté de fonctionnement de processus physiques avec une application à l'évaluation des paramètres FMD (Fiabilité-Maintenabilité-Disponibilité) des lignes de production dans le but d'en améliorer la performance,
• L'axe II porte sur la sûreté de fonctionnement des systèmes d'automatisation à intelligence distribuée avec la proposition d'une démarche de conception de tels systèmes et d'un formalisme pour la spécification des besoins et contraintes d'architecture, l'originalité de cette méthode repose sur la volonté d'obtenir une architecture validée par des paramètres de sûreté quantifiés.
De ces travaux découlent nos activités de recherche actuelles et futures relatives à l'analyse systémique de la sûreté de fonctionnement des systèmes complexes et à l'exploration de voies de recherche pour la proposition d'une méthodologie générique, indépendante du domaine d'application, pour la conception de systèmes complexes sûrs de fonctionnement.
Lucas, Pierre-Yves. "Modélisations, Simulations, Synthèses pour des réseaux dynamiques de capteurs sans fil". Thesis, Brest, 2016. http://www.theses.fr/2016BRES0114/document.
Texto completoThe integration of environment and information systems is progressing quickly since 10 years. This allows to monitor natural, physical or societal evolutions; to capture their logic and sometimes to control their effects. This integration is feasible thanks to many technical and scientific progresses: sensors, wireless communications, system on chips, batteries, distributed systems and geo-localization. The benefits are important for climate change monitoring and resource savings.In this context, we have firstly achieved a learning of technologies and several practical system realizations. We have produced a navigation software (QuickMap) allowing to interface gis databases and tile servers similar to OpenStreetMap, taking care of sensor locations and outputs. QuickMap is also a nice frontend to produce cellular systems oriented to physical simulations.Using the NetGen platform, we have produced a simulation framework allowing to schedule mobile moves with sensor field activities. A case study was leo satellites visiting remote sensor systems, with investigations on two algorithms suitable for data collection and control.Finally we have addressed the question of observation system virtualization by using an high level, process oriented virtual machine (tvm) to control the wireless link, a step forward to make the distributed and local behaviours homogeneous in terms of programming and simulation.Many of our developments are currently involved in active projects.This thesis was funded by a grant of Brest Metropole Oceane (BMO) and was achieved in a wireless research group at University of Brest, Lab-STICC laboratory
Vitay, Julien. "Emergence de fonctions sensorimotrices sur un substrat neuronal numérique distribué". Phd thesis, Université Henri Poincaré - Nancy I, 2006. http://tel.archives-ouvertes.fr/tel-00096818.
Texto completocomputationnelles dont le but est de modéliser des fonctions
cognitives complexes par le biais de simulations
informatiques et numériques en s'inspirant du fonctionnement
cérébral. Contrairement à une approche descendante nécessitant de
connaître une expression analytique de la fonction à simuler,
l'approche ascendante retenue permet d'observer
l'émergence d'une fonction grâce à l'interaction de populations de
neurones artificiels sans qu'elle soit connue à l'avance. Dans un
premier temps, nous présentons un modèle de réseau de neurones
particulier, les champs neuronaux, dont les propriétés
dynamiques de résistance au bruit et de continuité spatio-temporelle permettent cette émergence. Afin de guider l'émergence de transformations sensorimotrices sur ce substrat, nous présentons ensuite l'architecture des
systèmes visuel et moteur pour mettre en évidence le rôle central de l'attention visuelle dans la réalisation de ces fonctions
par le cerveau. Nous proposons ensuite un schéma
fonctionnel des transformations sensorimotrices dans lequel la
préparation d'une saccade oculaire guide l'attention vers une rÈgion
de l'espace visuel et permet la programmation du mouvement. Nous décrivons enfin un modèle computationnel de déplacement du point d'attention qui, en utilisant une mémoire de travail spatiale
dynamique, permet la recherche séquentielle d'une cible dans une scène visuelle grâce au phénomène d'inhibition de retour. Les performances de ce modèle (résistance au bruit, au mouvement des objets et à l'exécution de saccades) sont analysées en simulation et sur une plate-forme robotique.
Yaghi, Mohammed. "Phase Field Modeling of Water Solidification : A Port-Hamiltonian Approach". Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10198.
Texto completoThis thesis presents a study on modeling, formulating, and discretizing solidification processes using the Port Hamiltonian framework combined with the phase field approach. The goal is to provide numerical models suitable for simulating, designing, and controlling such processes. It addresses the challenges of representing and controlling phase change phenomena in distributed parameter models with moving interfaces, with a particular focus on the solidification of pure water. The work has been motivated by the development of green processes for water purification technologies such as cyclic melt and crystallization of water, which offer a low-energy solution while minimizing the use of hazardous materials. The first chapter recalls briefly the physical models of multiphase systems and the description of the interface between the phases, in terms of thin or diffuse interfaces. It presents the phase field theory and the associated thermodynamical models of the multiphase systems. Finally, it expresses the dynamics of solidification processes as a coupled system of evolution equations consisting of the Allen-Cahn equation and energy balance equations. A main contribution of this chapter consists in a comprehensive presentation of solidification using the entropy functional approach within the phase field framework. In the second chapter, the Port Hamiltonian formulation of the dynamics of solidification processes using the phase field approach is developed. This chapter introduces Boundary Port Hamiltonian Systems and shows how an extension of the state space to the gradient of the phase field variable leads to a Port Hamiltonian formulation of the solidification model. The model is written in such a way that it utilizes the available thermodynamic data for liquid water and ice, allowing for a detailed and physically-based modeling, leading to an implicit Boundary Port Hamiltonian model. The final chapter focuses on the structure-preserving discretization of the solidification process using the Partitioned Finite Element Method. This ensures that the discretized model retains the Port Hamiltonian structure and, in turn, the key properties such as energy conservation and passivity. The chapter covers weak formulations, projections, and discrete Hamiltonians for the heat equation and the Allen-Cahn equation, leading to the spatial discretization of the solidification model. The principal contribution of this chapter lies in the discretization methodology applied to the implicit Port Hamiltonian model of the solidification process using entropy as the generating function. Overall, this thesis provides structured models of solidification processes using the Port Hamiltonian framework, providing a foundation for their physics-based simulation and control and for future research and development in distributed parameter systems with moving interfaces, particularly for environmental and chemical engineering applications
Mallmann-Trenn, Frederik. "Analyse probabiliste de processus distribués axés sur les processus de consensus". Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEE058/document.
Texto completoThis thesis is devoted to the study of stochastic decentralized processes. Typical examples in the real world include the dynamics of weather and temperature, of traffic, the way we meet our friends, etc. We take the rich tool set from probability theoryfor the analysis of Markov Chains and employ it to study a wide range of such distributed processes: Forest Fire Model (social networks), Balls-into-Bins with Deleting Bins, and fundamental consensus dynamics and protocols such as the Voter Model, 2-Choices, and 3-Majority
Barger, Pavol. "Evaluation et validation de la fiabilité et de la disponibilité des systèmes d'automatisation à intelligence distribuée, en phase dynamique". Nancy 1, 2003. http://www.theses.fr/2003NAN10222.
Texto completoThe control systems dependability study is a task in which different characteristics have to be taken into account, such as functioning modes, communication network presence, etc. Some study methods exist but their application fields cannot represent the system globally. The approach proposed is based on the dynamic behavior analysis considering both functional and malfunctional behavior with a focus on the dynamic system configuration (state/phase). Colored Petri Nets (CPN) are used for modeling. Monte Carlo simulation is the main analysis method and is implemented in the Design/CPN software. The main study results include a proposition of system components models and the subsequent analysis by simulation. The original contribution is the proposition of one unified approach enabling the components modeling as well as their connection while using one single tool and expressing the viewpoints common to three areas: control systems, computer engineering and dependability assessment
Zemmari, Akka. "Contribution à l'analyse d'algorithmes distribués". Bordeaux 1, 2000. http://www.theses.fr/2000BOR10609.
Texto completoGrandemange, Quentin. "Contribution à la modélisation et à la détection d'anomalies du traffic Internet à partir de mesures d'un coeur de réseau opérateur". Electronic Thesis or Diss., Université de Lorraine, 2018. http://www.theses.fr/2018LORR0061.
Texto completoInter-domain routing statistics are not usually publicly available but with the partnership with Post Luxembourg, we deployed a network wide measurements of Internet traffic. Those statistics show clear daily and weekly pattern and several points of interest. From all the information gathered, two modelling approach were chosen: the first one from the time series domain and the second one from the machine learning approach. Both were tested on several dataset of autonomous systems and the second one, Gaussian Process, was kept for the next steps. The proposal of this study is the development of a software solution called ANODE, which is used at Post Luxembourg, allowing the analysis of backbone traffic: measurments, modelling, forecasting and anomaly detection
Pirson, Alain. "Conception et simulation d'architectures parallèles et distribuées pour le traitement d'images". Grenoble INPG, 1990. http://www.theses.fr/1990INPG0052.
Texto completoSlimi, Redouane. "Modélisation et simulation des systèmes distribués étalable par automates cellulaires". Perpignan, 2008. http://www.theses.fr/2008PERP0877.
Texto completoHicheur, Awatef. "Modélisation et analyse des processus Workflows reconfigurables et distribués par les ECATNets récursifs". Paris, CNAM, 2009. http://www.theses.fr/2009CNAM0645.
Texto completoIn this thesis, we propose a new model for the modeling and the analysis of distributed and reconfigurable worklow processes, namely Recursive ECATNets (RECATNets). RECATNets are sound combination of the ordinary ECATNets (Extended Concurrent Algebraic Terms Nets) and the recursive Petri nets. The interest of RECATNets which we precise their syntax and semantics, is to offer a reursive mechanism appropiate for the modeling of the dynamic creation and suppression of processes. We show also, via this model, the verification of the correction criteria of workflow processes (soundness and compatibility). The semantic of RECATNets is described in terms of rewriting logic allows the rapid prototyping and the formal verification of these properties using the Maude system. We propose also a temporal extension of the RECATNets model for the explicit representation of time constraints of reconfigurable workflows. For a complete verification, we also develop a method for the construction of the state class graph of the T-RECATNets and implement it in the framework of the rewriting logic
Bui, Marc. "Étude comportementale d'algorithmes distribués de contrôle". Paris 11, 1989. http://www.theses.fr/1989PA112242.
Texto completoVieira, De Mello Aline. "Tlmdt : une stratégie de modélisation basée sur temps distribué pour la simulation prallèle de systèmes multi-processeurs intégrés sur puce". Paris 6, 2013. http://www.theses.fr/2013PA066201.
Texto completoInnovative hardware architectures in the microelectronics industry are mainly characterized by their incredibly high level of parallelism. Despite their relative novelty, Multi-Processors System on Chip (MPSoCs) containing a few cores tend to be replaced by Massively Parallel MPSoCs (MP2SoCs), which integrate dozens or hundreds of processor cores interconnected through a possibly hierarchical network on chip. Several industrial and academic frameworks appeared to help modeling, simulating and debugging MP2SoC architectures. The SystemC hardware description language is the effective backbone of all these frameworks, which allows to describe the hardware at various levels of abstraction, ranging from synthesizable RTL (more accurate and very slow) to TLM (less accurate and very fast). However, when it comes to simulate an architecture containing hundreds of processors, even the simulation speed brought by TLM is not enough. Simultaneously, multi-core workstations are becoming the mainstream. Unfortunately, the genuine SystemC simulation kernel is fully sequential and cannot exploit the processing power provided by these multi-cores machines. In this context, the strategic goal of this thesis is to propose a general modeling approach for timed TLM virtual prototyping of shared memory MP2SoCs, called Transaction Level Modeling with Distributed Time (TLM-DT). The main idea of the TLM-DT approach is not to use anymore the SystemC global simulation time, becoming possible to use a truly parallel simulation engine and providing a significant reduction in simulation time with a limited loss of precision
Geisweiller, Nil. "Étude sur la modélisation et la vérification probabiliste d'architectures de simulations distribuées pour l'évaluation de performances". Toulouse, ENSAE, 2006. http://www.theses.fr/2006ESAE0003.
Texto completoRosa, Cristian. "Évaluation de la Performance et de la Correction de Systèmes Distribués". Phd thesis, Université Henri Poincaré - Nancy I, 2011. http://tel.archives-ouvertes.fr/tel-00749039.
Texto completoRosa, Cristian. "Vérification des performances et de la correction des systèmes distribués". Thesis, Nancy 1, 2011. http://www.theses.fr/2011NAN10113/document.
Texto completoDistributed systems are in the mainstream of information technology. It has become standard to rely on multiple distributed units to improve the performance of the application, help tolerate component failures, or handle problems too large to fit in a single processing unit. The design of algorithms adapted to the distributed context is particularly difficult due to the asynchrony and the nondeterminism that characterize distributed systems. Simulation offers the ability to study the performance of distributed applications without the complexity and cost of the real execution platforms. On the other hand, model checking allows to assess the correctness of such systems in a fully automatic manner. In this thesis, we explore the idea of integrating a model checker with a simulator for distributed systems in a single framework to gain performance and correctness assessment capabilities. To deal with the state explosion problem, we present a dynamic partial order reduction algorithm that performs the exploration based on a reduced set of networking primitives, that allows to verify programs written for any of the communication APIs offered by the simulator. This is only possible after the development of a full formal specification with the semantics of these networking primitives, that allows to reason about the independency of the communication actions as required by the DPOR algorithm. We show through experimental results that our approach is capable of dealing with non trivial unmodified C programs written for the SimGrid simulator. Moreover, we propose a solution to the problem of scalability for CPU bound simulations, envisioning the simulation of Peer-to-Peer applications with millions of participating nodes. Contrary to classical parallelization approaches, we propose parallelizing some internal steps of the simulation, while keeping the whole process sequential. We present a complexity analysis of the simulation algorithm, and we compare it to the classical sequential algorithm to obtain a criteria that describes in what situations a speed up can be expected. An important result is the observation of the relation between the precision of the models used to simulate the hardware resources, and the potential degree of parallelization attainable with this approach. We present several case studies that benefit from the parallel simulation, and we show the results of a simulation at unprecedented scale of the Chord Peer-to-Peer protocol with two millions nodes executed in a single machine
Cavaliere, Domenico. "DAMeSI : un profil pour l'évaluation de performances des systèmes d'automatisation distribués". Vandoeuvre-les-Nancy, INPL, 2002. http://www.theses.fr/2002INPL032N.
Texto completoRosa, Cristian. "Vérification des performances et de la correction des systèmes distribués". Electronic Thesis or Diss., Nancy 1, 2011. http://www.theses.fr/2011NAN10113.
Texto completoDistributed systems are in the mainstream of information technology. It has become standard to rely on multiple distributed units to improve the performance of the application, help tolerate component failures, or handle problems too large to fit in a single processing unit. The design of algorithms adapted to the distributed context is particularly difficult due to the asynchrony and the nondeterminism that characterize distributed systems. Simulation offers the ability to study the performance of distributed applications without the complexity and cost of the real execution platforms. On the other hand, model checking allows to assess the correctness of such systems in a fully automatic manner. In this thesis, we explore the idea of integrating a model checker with a simulator for distributed systems in a single framework to gain performance and correctness assessment capabilities. To deal with the state explosion problem, we present a dynamic partial order reduction algorithm that performs the exploration based on a reduced set of networking primitives, that allows to verify programs written for any of the communication APIs offered by the simulator. This is only possible after the development of a full formal specification with the semantics of these networking primitives, that allows to reason about the independency of the communication actions as required by the DPOR algorithm. We show through experimental results that our approach is capable of dealing with non trivial unmodified C programs written for the SimGrid simulator. Moreover, we propose a solution to the problem of scalability for CPU bound simulations, envisioning the simulation of Peer-to-Peer applications with millions of participating nodes. Contrary to classical parallelization approaches, we propose parallelizing some internal steps of the simulation, while keeping the whole process sequential. We present a complexity analysis of the simulation algorithm, and we compare it to the classical sequential algorithm to obtain a criteria that describes in what situations a speed up can be expected. An important result is the observation of the relation between the precision of the models used to simulate the hardware resources, and the potential degree of parallelization attainable with this approach. We present several case studies that benefit from the parallel simulation, and we show the results of a simulation at unprecedented scale of the Chord Peer-to-Peer protocol with two millions nodes executed in a single machine
Djahanguir, Amir Hossein. "Accélération de la simulation logico-fonctionnelle : simulateur à évènements discrets totalement distribués". Toulouse, INSA, 1989. http://www.theses.fr/1989ISAT0017.
Texto completoJacewicz, Przemyslaw. "Modélisation et simulation des systèmes distribués par automates cellulaires : application en écologie". Perpignan, 2002. http://www.theses.fr/2002PERP0455.
Texto completoThe work developed in this thesis concerns modeling, analysis and simulation by cellular automata approach, of some classes of distributed parameter systems. The concepts of spreadability, identification and parameters estimation are studied. An application to vegetation dynamics is developed. Various simulation examples are performed using both symbolic languages and specific programs mainly written in C++
Fix, Jérémy. "Mécanismes numériques et distribués de l'anticipation motrice". Phd thesis, Université Henri Poincaré - Nancy I, 2008. http://tel.archives-ouvertes.fr/tel-00336194.
Texto completoNous nous intéressons dans cette thèse à la modélisation de l'attention visuelle, avec ou sans mouvement oculaire. Pour guider le développement de nos modèles, nous proposons dans une première partie une revue de données psychologiques et physiologiques sur l'attention visuelle avant de proposer un modèle computationnel de l'attention visuelle sans saccade oculaire. Puis, nous nous intéressons dans une seconde partie à la manière dont on peut intégrer les saccades oculaires dans nos modèles en s'inspirant des données anatomiques et physiologiques sur le contrôle des saccades oculaires chez le primate. Les performances des différents mécanismes proposés sont évalués en simulation en les appliquant à des tâches de recherche visuelle.
Nos travaux de thèse permettent également d'étudier un paradigme de calcul original qui repose sur des calculs distribués, asynchrones, numériques et adaptatifs qui permettent d'envisager le déploiement des mécanismes proposés dans ce cadre sur des supports de calculs parallèles.
Atamna, Youcef. "Réseaux de Petri temporisés stochastiques classiques et bien formés. Définition, analyse et application aux systèmes distribués temps réel". Toulouse 3, 1994. http://www.theses.fr/1994TOU30095.
Texto completoToto-Zarasoa, Velotiaray. "Codage de sources distribués : outils et applications à la compression vidéo". Rennes 1, 2010. https://tel.archives-ouvertes.fr/tel-00539044.
Texto completoDistributed source coding is a technique that allows to compress several correlated sources, without any cooperation between the encoders, and without rate loss provided that the decoding is joint. Motivated by this principle, distributed video codin has emerged, exploiting the correlation between the consecutive video frames, tremendously simplifying the encoder, and leaving the task of exploiting the correlation to the decoder. The first part of our contributions in this thesis presents the asymmetric coding of binary sources that are not uniform. We analyze the coding of non-uniform Bernoulli sources, and that of hidden Markov sources. For both sources, we first show that exploiting the distribution at the decoder clearly increases the decoding capabilities of a given channel code. For the binary symmetric channel modeling the correlation between the sources, we propose a tool to estimate its parameter, thanks to an EM algorithm. We show that this tool allows to obtain fast estimation of the parameter, while having a precision that is close to the Cramer-Rao lower bound. In the second part, we develop some tools that facilitate the coding of the previous sources. This is done by the use of syndrome-based Turbo and LDPC codes, and the EM algorithm. This part also presents new tools that we have developed to achieve the bounds of asymmetric and non-asymmetric distributed source coding. We also show that, when it comes to non-uniform sources, the roles of the correlated sources are not symmetric. Finally, we show that the proposed source models are well suited for the video bit planes distributions, and we present results that proof the efficiency of the developed tools. The latter tools improve the rate-distortion performance of the video codec in an interesting amount, provided that the correlation channel is additive
Tang, Gula. "Research on distributed warning system of water quality in Mudan river based on EFDC and GIS". Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAD023/document.
Texto completoSimulation and Early Warning System (SEWS) is a powerful tool for river water quality monitoring. Mudan River, an important river in northeastern cold regions of China, can run out of China into Russia. Thus, the water quality of Mudan River is highly concerned not only locally andregionally but also internationally. Objective of this study is to establish an excellent SEWS of water quality so that the spatio-temporal distribution of water quality in both open-water and ice-covered periods can be accurately simulated and visualized to understand the spatial variation of pollutants along the river course. The dissertation is structured into 7 chapters, chapter 1 outlines the background of the study and reviews the current progress. Chapter Il compares the main available models for evaluating river water quality so that a better model can be selected as the basis to establish a modeling system for Mudan River. Chapter Ill establishes the model, the required boundary conditions and parameters for the model were verified and calibrated. Chapter IV, a distributed simulation procedure was designed to increase the simulation efficiency. Chapter V discusses more about the programing and operational issues of the distributed simulation. Chapter VI is about the core techniques to implement the system. Chapter VII is the conclusion of the study to summarize the key points and innovations of the study. The study has the following three points as innovation : a two-dimensional environmental fluid dynamics model for Mudan River, an efficient distributed model computational method and a prototype of SEWS, which can greatly improve the capability of monitoring and management of water quality in Mudan River and other similar rivers
Messika, Stéphane. "Méthodes probabilistes pour la vérification des systèmes distribués". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2004. http://tel.archives-ouvertes.fr/tel-00136083.
Texto completoAzeli, Nourelhouda. "Maintenance prévisionnelle des systèmes de production géographiquement distribués sous ressources limitées". Electronic Thesis or Diss., Troyes, 2022. http://www.theses.fr/2022TROY0017.
Texto completoThis thesis addresses the problem of predictive maintenance decision making for geographically dispersed production systems (GDPS). The structure of GDPS represents an important challenge for the establishment of efficient maintenance strategies. Predictive maintenance strategies are particularly suitable. However, the issue of the availability of maintenance resources must be analyzed and integrated. In this thesis, we propose three predictive maintenance policies considering limited maintenance resources for a GDPS with gradually degrading production sites. The three proposed policies aim at optimizing an economic criterion by selecting the set of sites to be maintained. The first two policies are based on periodic inspection data. The first policy selects for maintenance, the permutation of sites that maximizes the reliability of the system after repair, without considering the distances. The second policy constructs the tour of sites to be maintained from the available resources and the distances between sites. Finally, the third policy is a dynamic policy. It relies on real-time monitoring data of degradation levels to adapt the tour. We used Monte Carlo simulation to evaluate the asymptotic economic criterion. The effectiveness of the proposed policies is demonstrated by comparison with more conventional policies
Kadi, Imène Yamina. "Simulation et monotonie". Versailles-St Quentin en Yvelines, 2011. http://www.theses.fr/2011VERS0029.
Texto completoThe work of this thesis concern the contribution of the monotony in simulation methods. Initially, we focus on the study of different monotonicity notions used in stochastic modeling, trying to define the relationships between them. Three concepts have been defined in this field: the stochastic monotonicity based on stochastic comparison, the realizable monotony and finally the events monotony used in the perfect simulation. This study allowed us to use the stochastic monotonicity properties under the monotone perfect simulation. On the other hand, we have proposed monotone invertible encodings for systems whose natural representation is not monotone. This encoding allows to accelerate monotonous simulations and found its application in the simulation of optical burst. Another work was done in the field of parallel simulation, it use monotonicity properties of simulated systems to better parallelize the simulation process. This should produce a substantial acceleration in simulations
Puig, Bénédicte. "Modélisation et simulation de processus stochastiques non gaussiens". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2003. http://tel.archives-ouvertes.fr/tel-00003526.
Texto completoCanicas, Jean-François. "Formalisation et simulation du processus de reconnaissance intermoléculaire". Bordeaux 1, 1985. http://www.theses.fr/1985BOR10585.
Texto completoCanicas, Jean-François. "Formalisation et simulation du processus de reconnaissance intermoléculaire". Grenoble : ANRT, 1985. http://catalogue.bnf.fr/ark:/12148/cb37594545c.
Texto completoLenôtre, Lionel. "Étude et simulation des processus de diffusion biaisés". Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S079/document.
Texto completoWe consider the skew diffusion processes and their simulation. This study are divided into four parts and concentrate on the processes whose coefficients are piecewise constant with discontinuities along a simple hyperplane. We start by a theoretical study of the one-dimensional case when the coefficients belong to a broader class. We particularly give a result on the structure of the resolvent densities of these processes and obtain a computational method. When it is possible, we perform a Laplace inversion of these densities and provide some transition functions. Then we concentrate on the simulation of skew diffusions process. We build a numerical scheme using the resolvent density for any Feller processes. With this scheme and the resolvent densities computed in the previous part, we obtain a simulation method for the skew diffusion processes in dimension one. After that, we consider the multidimensional case. We provide a theoretical study and compute some functionals of the skew diffusions processes. This allows to obtain among others the transition function of the marginal process orthogonal to the hyperplane of discontinuity. Finally, we consider the parallelization of Monte Carlo methods. We provide a strategy which allows to simulate a large batch of skew diffusions processes sample paths on massively parallel architecture. An interesting feature is the possibility to replay some the sample paths of previous simulations
Reuillon, Romain. "Simulations stochastiques en environnements distribués : application aux grilles de calcul". Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2008. http://tel.archives-ouvertes.fr/tel-00731242.
Texto completoFleury, Cédric. "Modèles de conception pour la collaboration distante en environnements virtuels distribués : del'architecture aux métaphores". Rennes, INSA, 2012. http://www.theses.fr/2012ISAR0012.
Texto completoThis PhD work aims to improve the collaboration between users: we propose some new models for designing collaborative virtual environments to deal with the distributed architecture, but also to integrate some new metaphors for the collaboration. To ensure that all users have the same state of the virtual environment at the same time, we propose a first model to dynamically adapt the data distribution on the network. We also propose a second software architecture model which clearly separates the data of the virtual environment from the network layer and from the users’ specific components. To enable several users using different material devices to collaborate, we describe a third model which integrate the users in the virtual environment by taking account of their real environment. In the context of the ANR Collaviz project, these three models make possible to design a new framework that can be used to realize some experimentations of remote collaboration
Villefranche, Laurent y Frédéric Serin. "Simulateur de gestion d'un terminal à conteneurs : simulation discrète par macro-processus et processus complementaires". Rouen, 1996. http://www.theses.fr/1996ROUES002.
Texto completoGlardon, Carmen. "Simulation et optimisation du processus constructif de rénovation d'immeubles /". [S.l.] : [s.n.], 1995. http://library.epfl.ch/theses/?nr=1355.
Texto completoDroux, Jean-Jacques. "Simulation numérique bidimensionnelle et tridimensionnelle de processus de solidification /". [S.l.] : [s.n.], 1991. http://library.epfl.ch/theses/?nr=901.
Texto completoRoudier, Pascale. "Synthèse de paysages réalistes par simulation de processus d'érosion". Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 1993. http://tel.archives-ouvertes.fr/tel-00835373.
Texto completoCantegrit, Eric. "Modélisation et simulation orientées objets des processus par lot". Lille 1, 1988. http://www.theses.fr/1988LIL10045.
Texto completoMarti, Aliod Carles. "Simulation de processus de stockage chimique pour l'énergie renouvelable". Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30358.
Texto completoThe aim of the present thesis encompasses different processes related to the storage of energy coming from renewable sources. Concretely, this thesis aims to study, from a theoretical point of view, the processes related to the plasma-assisted Sabatier reaction (CO 2 + 4 H2 → CH4 + 2 H2O), where the heterogeneous catalyst is composed by Ni/Ru elements. The research is consequently split in the topics developed at each partner specialties. In the university of Perugia, the plasma/gas phase processes are considered, concretely the study of the OH + H 2 using the quantum-classical method. The main innovative procedure has been to add a long-range potential tail to the already available. Potential Energy Surface (PES), converting it into a suitable one for non reactive processes, while maintaining the accuracy of the ab initio, necessary for the reactive processes. In this sense we carried out a study of OH + H2 scattering using a quantum-classical method, treating quantally vibrations and classically both translations and rotations. The good agreement between the state specific quantum- classical reactive probabilities and the corresponding full quantum ones prompted the extension of the study to state to state probabilities for non reactive vibrational energy exchange. The study showed that H 2 reactive dynamics depends on the vibrational excitation, while the non reactive one is mainly vibrationally adiabatic. On the contrary, OH reactive dynamics is not affected by its vibrational excitation, whereas the non reactive one might produce some pumping up to higher vibrational states. In the university Paul Sabatier of Toulouse, the Ru clusters and nanoparticles, part of the industrial catalyst are studied using the DFTB approach. The intend was to investigate the ability of DFTB to provide reliable results about electronic structure, structural properties and stability of monometallic ruthenium systems covering the size range from small clusters to larger nanoparticles and the bulk. Due to the fact that the electronic bonding and structural organization of ruthenium cluster are somewhat specific in regard of other metal clusters, it is challenging to examine whether DFTB is able to account for such peculiarities. Parallel-Tempering Molecular Dynamics (PTMD), was used in combination with periodic quenching to achieve global optimization of neutral, cationic and anionic clusters in the range n=3-20.[...]
Cantegrit, Eric. "Modélisation et simulation orientées objets des processus par lot". Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376123822.
Texto completoRachah, Amira. "Modélisation mathématique, simulation et contrôle de processus de cristallisation". Toulouse 3, 2014. http://thesesups.ups-tlse.fr/2528/.
Texto completoIn this thesis we are concerned with the mathematical modeling of crystallization processes in order to understand, simulate, optimize and control them. We first present the principles of modeling, the fundamentals of crystallization and the numerical exploitation of models of crystallization. We then discuss exemplary a mathematical model of crystallization of KCl in continuous operational mode with dissolution of fines and product classiffication. This model is described by a hyperbolic partial differential equation coupled with an integro-differential equation. To justify the theoretical model, we prove existence and uniqueness of solutions using the method of characteristics and the Banach fixed-point theorem. We then present numerical simulations of the studied processes. In a third part of the thesis we develop and present a mathematical model of solvated crystallization of a-lactose monohydrate in semi-batch operational mode. We justify the model by proving global existence and uniqueness of solutions. Finally, we study the optimal control of crystallization of a-lactose monohydrate in semi-batch mode using the solvers ACADO and PSOPT. Optimal cooling and filling strategies are computed in order to enhance the properties of the solid
Grandemange, Quentin. "Contribution à la modélisation et à la détection d'anomalies du traffic Internet à partir de mesures d'un coeur de réseau opérateur". Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0061/document.
Texto completoInter-domain routing statistics are not usually publicly available but with the partnership with Post Luxembourg, we deployed a network wide measurements of Internet traffic. Those statistics show clear daily and weekly pattern and several points of interest. From all the information gathered, two modelling approach were chosen: the first one from the time series domain and the second one from the machine learning approach. Both were tested on several dataset of autonomous systems and the second one, Gaussian Process, was kept for the next steps. The proposal of this study is the development of a software solution called ANODE, which is used at Post Luxembourg, allowing the analysis of backbone traffic: measurments, modelling, forecasting and anomaly detection
Huck, Emmanuel. "Simulation de haut niveau de systèmes d'exploitations distribués pour l'exploration matérielle et logicielle d'architectures multi-noeuds hétérogènes". Phd thesis, Université de Cergy Pontoise, 2011. http://tel.archives-ouvertes.fr/tel-00781961.
Texto completoOccello, Michel. "Blackboards distribués et parallèles : application au contrôle de systèmes dynamiques en robotique et en informatique musicale". Nice, 1993. http://www.theses.fr/1993NICE4627.
Texto completoThis thesis deals with the design of software tools for « intelligent » process control, i. E. Real time intelligent software. These tools need decision making and operator assistance capabilities. They involve many types of cooperating knowledge. In Distributed Artificial Intelligence, the blackboard concept can be viewed as a orgnisational framework for multi agent systems. The adaptation of the blackboard concept to the design of control tools is studied in order to show advantages and limits and to build a model according to the constraints of the domain. A synthesis of the studies on blackboard in existing control systems and on the use of parallelism in this system shows that the problem is the specification of an architecture able to meet real time constraints. Then, an original model of real time parallel blackboard is presented. A representation of the concept in this framework using mathematical sets is chosen. The specification of agents and shared data is sufficient to describe the system. A generic control unit is proposed. The components of the model are described using Petri nets. A development tool based on this model is presented. Finally, this thesis proposes a decomposition of the problem of process control based on specialized blackboards. Three applications valid the model and the decomposition. They deal with computer music robotics and teleoperation
Gautier, Guillaume Michel Jean. "Sur l’échantillonnage des processus ponctuels déterminantaux". Thesis, Centrale Lille Institut, 2020. http://www.theses.fr/2020CLIL0002.
Texto completoDeterminantal point processes (DPPs) generate random configuration of points where the points tend to repel each other. The notion of repulsion is encoded by the sub-determinants of a kernel matrix, in the sense of kernel methods in machine learning. This special algebraic form makes DPPs attractive both in statistical and computational terms. This thesis focuses on sampling from such processes, that is on developing simulation methods for DPPs. Applications include numerical integration, recommender systems or the summarization of a large corpus of data. In the finite setting, we establish the correspondence between sampling from a specific type of DPPs, called projection DPPs, and solving a randomized linear program. In this light, we devise an efficient Markov-chain-based sampling method. In the continuous case, some classical DPPs can be sampled by computing the eigenvalues of carefully randomized tridiagonal matrices. We provide an elementary and unifying treatment of such models, from which we derive an approximate sampling method for more general models. In higher dimension, we consider a special class of DPPs used for numerical integration. We implement a tailored version of a known exact sampler, which allows us to compare the properties of Monte Carlo estimators in new regimes. In the context of reproducible research, we develop an open-source Python toolbox, named DPPy, which implements the state of the art sampling methods for DPPs
Sbai, Mohamed. "Modélisation de la dépendance et simulation de processus en finance". Phd thesis, Université Paris-Est, 2009. http://tel.archives-ouvertes.fr/tel-00451008.
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