Thèses sur le sujet « Modélisation de liens »
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Benali, Mehdi. « Une modélisation des liens de coopération et des trajectoires d'évolution des réseaux d'entreprises ». Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2005. http://tel.archives-ouvertes.fr/tel-00797048.
Texte intégralFraisse, Hervé. « Contribution à la modélisation dynamique des circuits magnétiques d'actionneurs : formulation graphes de liens ». Lyon 1, 1997. http://www.theses.fr/1997LYO10031.
Texte intégralHelali, Hichem. « Contribution à la modélisation par graphe de liens du transistor MOS de puissance ». Lyon, INSA, 1995. http://www.theses.fr/1995ISAL0038.
Texte intégralThe models of semiconductor devices developed for micro-electronic purpose, are not satisfying in the power electronic field. CEGELY has developed the simulator software PACTE that is based on bond graph technique. Also it has been developed the hardware description language M++. The present work firstly covers the transcription of the main SPICE - oriented models using the M++ language, in order to ease the simulation of the drivers of the power semiconductor devices. It has been derived a new mode! of the power MOS transistor. Particularly the latter modeling uses the basic semiconductor regions approach. A new mode! of the channel (one basic semiconductor region) is discussed. This channel mode! is well adapted to the power MOS transistor model has it takes. . . _ into account a non uniform doping level and the transverse unbalance of electrons in the channel. Ail the physical analysis that this modeling work is based on, rely on a systematic comparison of the analytical mode! of a pilot power MOS transistor with the device simulator MEDICI. The simulation results obtained with the latter mode! show an important improvement regarding the classical models. The results have been compared to measurements and simulation results with MEDICI, particularly in the steady state operation of the power MOS transistor
Franck, Laurent. « Algorithmes de routage dans les réseaux de liens inter-satellites ». Paris, ENST, 2001. http://www.theses.fr/2001ENST0038.
Texte intégralKergoat, Laurent. « Contribution à la modélisation du fonctionnement de la biosphère terrestre. Liens avec l'observation spatiale ». Toulouse 3, 1995. http://www.theses.fr/1995TOU30205.
Texte intégralBotterman, Hông-Lan. « Corrélations dans les graphes d'information hétérogène : prédiction et modélisation de liens à partir de méta-chemins ». Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS083.
Texte intégralMany entities, possibly of different natures, are linked by physical or virtual links, that may also be of different natures. Such data can be represented by a heterogeneous information network (HIN). In addition, there are often correlations between real-life entities or events. Once represented by suitable abstractions (such as HIN), these correlations can therefore be found in the HIN. Motivated by these considerations, this thesis investigates the effects of possible correlations between the links of an HIN on its structure. This present work aims at answering questions such as: are there indeed correlations between different types of links? If so, is it possible to quantify them? What do they mean? How can they be interpreted? Can these correlations be used to predict the occurrence of links? To model co-evolution dynamics? The examples studied can be divided into two categories. First, the use of correlations for the prediction of the links’ weight is studied. It is shown that correlations between links, and more specifically between paths, can be used to recover and, to some extent, predict the weight of other links of a specified type. Second, a link weight dynamics is considered. It is shown that link co-evolution can be used, for example, to define a model of attention between individuals and subjects. The preliminary results are in agreement with others in the literature, mainly related to models of opinion dynamics. Overall, this work illustrates the importance of correlations between the links of an HIN. In addition, it supports the general fact that different types of nodes and links abound in nature and that it could be important and instructive to take this diversity into account in order to understand the organization and functioning of a system
Longueville, Véronique. « Modélisation, calcul et évaluation de liens pour la navigation dans les grands ensembles d'images fixes ». Toulouse 3, 1993. http://www.theses.fr/1993TOU30149.
Texte intégralViard, Tiphaine. « Flots de liens pour la modélisation d'interactions temporelles et application à l'analyse de trafic IP ». Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066730.
Texte intégralInteractions are everywhere: in the contexts of face-to-face contacts, emails, phone calls, IP traffic, online purchases, running code, and many others. Interactions may be directed, weighted, enriched with supplementary information, yet the baseline remains: in all cases, an interaction means that two entities u and v interact together from time b to time e: for instance, two individuals u and v meet from time b to time e, two machines on a network start an IP session from time b to time e, two persons u and v phone each other from time b to time e, and so on.In this thesis, we explore a new approach consisting in modelling interactions directly as link streams, i.e. series of quadruplets ( b, e, u, v ) meaning that u and v interacted from time b to time e, and we develop the basis of the corresponding formalism. In order to guide and assess this fundamental work, we focus on the analysis of IP traffic. It is particularly important to us that we make both fundamental and applied progress: application cases should feed our theoretical thoughts, and formal tools are designed to have meaning on application cases in the most general way.We apply our framework to the analysis of IP traffic, with the aim of assessing the relevance of link streams for describing IP traffic as well as finding events inside the traffic. We devise a method to identify events at different scales, and apply it to a trace of traffic from the MAWI dataset
Viard, Tiphaine. « Flots de liens pour la modélisation d'interactions temporelles et application à l'analyse de trafic IP ». Electronic Thesis or Diss., Paris 6, 2016. http://www.theses.fr/2016PA066730.
Texte intégralInteractions are everywhere: in the contexts of face-to-face contacts, emails, phone calls, IP traffic, online purchases, running code, and many others. Interactions may be directed, weighted, enriched with supplementary information, yet the baseline remains: in all cases, an interaction means that two entities u and v interact together from time b to time e: for instance, two individuals u and v meet from time b to time e, two machines on a network start an IP session from time b to time e, two persons u and v phone each other from time b to time e, and so on.In this thesis, we explore a new approach consisting in modelling interactions directly as link streams, i.e. series of quadruplets ( b, e, u, v ) meaning that u and v interacted from time b to time e, and we develop the basis of the corresponding formalism. In order to guide and assess this fundamental work, we focus on the analysis of IP traffic. It is particularly important to us that we make both fundamental and applied progress: application cases should feed our theoretical thoughts, and formal tools are designed to have meaning on application cases in the most general way.We apply our framework to the analysis of IP traffic, with the aim of assessing the relevance of link streams for describing IP traffic as well as finding events inside the traffic. We devise a method to identify events at different scales, and apply it to a trace of traffic from the MAWI dataset
Campolina, Bruno. « Modélisation vibroacoustique de double-parois aéronautiques avec liens mécaniques par la méthode de l'analyse statistique énergétique ». Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00736619.
Texte intégralGauvry, Emilie. « Modélisation de la sporulation de Bacillus subtillis BSB1 et liens physiologiques avec les cinétiques de croissance ». Thesis, Brest, 2017. http://www.theses.fr/2017BRES0140/document.
Texte intégralSpore-forming bacteria cause health risks and alteration of food products. They can sporulate to form cells resistant to various physical or chemical aggressions. In order to limit the formation of spores in food and on production lines in the agri-food industry, a preventive approach consists in predicting this bacterial process according to the environmental conditions encountered during the manufacturing processes. For this, a kinetic model describing both growth and sporulation of the bacterium model Bacillus subtilis BSB1 was developed. This model is a useful tool for assessing the impact of environmental factors on quantitative and physiological aspects of growth and sporulation of B. subtilis. Unfavorable conditions of temperature, pH and water activity cause a slowing of B. subtilis’ growth, a more synchronous sporulation in the bacterial population leading to later spore emergence and lower spore production. All these effects have been described with a predictive model of growth and sporulation: the cardinal model. These (kinetic and cardinal) models are efficient to predict growth and sporulation of B. subtilis BSB1 in different culture conditions, different matrices and in dynamic conditions of environmental factors. This work and these mathematical models will allow a better understanding of the sporulation behavior of bacteria according to environmental factors and thus a better understanding of the sporulation in the agrofood industry
Bidaj, Klodjan. « Modélisation du bruit de phase et de la gigue d'une PLL, pour les liens séries haut débit ». Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0355/document.
Texte intégralBit rates of high speed serial links (USB, SATA, PCI-express, etc.) have reached the multi-gigabits per second, and continue to increase. Two of the major electrical parameters used to characterize SerDes Integrated Circuit performance are the transmitted jitter at a given bit error rate (BER) and the receiver capacity to track jitter at a given BER.Modeling the phase noise of the different SerDes components, extracting the time jitter and decomposing it, would help designers to achieve desired Figure of Merit (FoM) for future SerDes versions. Generating white and colored noise synthetic jitter patterns would allow to better analyze the effect of jitter in a system for design verification.The phase locked loop (PLL) is one of the contributors of clock random and periodic jitter inside the system. This thesis presents a method for modeling the PLL with phase noise injection and estimating the time domain jitter. A time domain model including PLL loop nonlinearities is created in order to estimate jitter. A novel method for generating Gaussian distribution synthetic jitter patterns from colored noise profiles is also proposed.The Standard Organizations specify random and deterministic jitter budgets. In order to decompose the PLL output jitter (or the generated jitter from the proposed method), a new technique for jitter analysis and decomposition is proposed. Modeling simulation results correlate well with measurements and this technique will help designers to properly identify and quantify the sources of deterministic jitter and their impact on the SerDes system.We have developed a method, for specifying PLLs in terms of Phase Noise. This method works for any standard (USB, SATA, PCIe, …), and defines Phase noise profiles of the different parts of the PLL, in order to be sure that the standard requirements are satisfied in terms of Jitter
Nguyen, Van Minh. « Modélisation des Liens de Communication Radio et Optimisation de la Gestion de Mobilité dans les Réseaux Cellulaires ». Phd thesis, Télécom ParisTech, 2011. http://pastel.archives-ouvertes.fr/pastel-00610041.
Texte intégralNguyen, Van Minh. « Modélisation des liens de communication radio et optimisation de la gestion de mobilité dans les réseaux cellulaires ». Phd thesis, Paris, Télécom ParisTech, 2011. https://pastel.hal.science/pastel-00610041.
Texte intégralThe quality of communication in a wireless network is primarily determined by the wireless link signal quality expressed in term of signal to-interference-plus-noise ratio. The fact that better signal quality enhances the communication quality incites to look for states whereeach receiver connects to a transmitter providing it with the best signal quality. Using stochastic geometry and then extreme value theory,we obtain the distribution of the best signal quality, of the interference, and of the maximum signal strength in both bounded and unbounded path loss conditions. We then investigate temporal variations of wireless links, which are also essential to wireless networking, in terms of level crossings of a stationary process X(t). We prove that the length of an excursion of X(t) above a level γ→-∞ has an exponential distribution, and obtain results associated with the crossings of several levels. These results are then applied to mobility management in cellular networks. We focus on the handover measurement function, which differs from the handover decision-execution by identifying the best neighbouring cell to which a connection switching is to be decided and executed. This function has an important influence on the user's experience, though its operation has been questionable due to the complexity of combining control mechanisms. We firstly address this topic with an analytical approach for emerging macro cell and small cell networks, and then with a self-optimisation approach for neighbour cell lists used in today's cellular networks
Gaude, Daniel. « Modélisation et simulation de systèmes électromagnétiques à induction avec prise en compte des matériaux magnétiques et formulation par graphes de liens ». Lyon 1, 1999. http://www.theses.fr/1999LYO10115.
Texte intégralLienhardt, Denis. « Exploitation de la représentation d'état linéaire : modélisation et simulation des systèmes non-linéaires décrits par le langage des graphes à liens ». Mulhouse, 1989. http://www.theses.fr/1989MULH0112.
Texte intégralBresch, Didier. « Etude et réalisation d'un outil logiciel de modélisation et de simulation de systèmes automatiques utilisant la représentation des graphes à liens ». Mulhouse, 1986. http://www.theses.fr/1986MULH0011.
Texte intégralGnanguenon, guesse Girault. « Modélisation et visualisation des liens entre cinétiques de variables agro-environnementales et qualité des produits dans une approche parcimonieuse et structurée ». Electronic Thesis or Diss., Montpellier, 2021. http://www.theses.fr/2021MONTS139.
Texte intégralThe development of digital agriculture allows to observe at high frequency the dynamics of production according to the climate. Data from these dynamic observations can be considered as functional data. To analyze this new type of data, it is necessary to extend the usual statistical tools to the functional case or develop new ones.In this thesis, we have proposed a new approach (SpiceFP: Sparse and Structured Procedure to Identify Combined Effects of Functional Predictors) to explain the variations of a scalar response variable by two or three functional predictors in a context of joint influence of these predictors. Particular attention was paid to the interpretability of the results through the use of combined interval classes defining a partition of the observation domain of the explanatory factors. Recent developments around LASSO (Least Absolute Shrinkage and Selection Operator) models have been adapted to estimate the areas of influence in the partition via a generalized penalized regression. The approach also integrates a double selection, of models (among the possible partitions) and of variables (areas inside a given partition) based on AIC and BIC information criteria. The methodological description of the approach, its study through simulations as well as a case study based on real data have been presented in chapter 2 of this thesis.The real data used in this thesis were obtained from a vineyard experiment aimed at understanding the impact of climate change on anthcyanins accumulation in berries. Analysis of these data in chapter 3 using SpiceFP and one extension identified a negative impact of morning combinations of low irradiance (lower than about 100 µmol/s/m2 or 45 µmol/s/m2 depending on the advanced-delayed state of the berries) and high temperature (higher than about 25°C). A slight difference associated with overnight temperature occurred between these effects identified in the morning.In chapter 4 of this thesis, we propose an implementation of the proposed approach as an R package. This implementation provides a set of functions allowing to build the class intervals according to linear or logarithmic scales, to transform the functional predictors using the joint class intervals and finally to execute the approach in two or three dimensions. Other functions help to perform post-processing or allow the user to explore other models than those selected by the approach, such as an average of different models.Keywords: Penalized regressions, Interaction, information criteria, scalar-on-function, interpretable coefficients,grapevine microclimate
Lecoq, Jean-Christophe. « Modélisation logique de liens entre attributs hétérogènes, fondée sur une technique de fermeture vectorielle généralisée dans un environnement multimédia à couplage ». Rouen, INSA, 2004. http://www.theses.fr/2004ISAM0008.
Texte intégralBotella, Nathalie. « Modélisation psychodynamique des processus psychiques de la médiatisation des visites parent-enfant lors d'un placement précoce ». Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE2054.
Texte intégralThis thesis proposes to continue the work on mediated visits during a judicial placement of the child. It aims to clarify the outline and theoretical whys of a clinical practice of mediatization that allows to support a work of symbolization in such a context. This momentum comes from the desire to contribute to the evolution of professional representations on the stakes of these meeting times, intended to maintain parent-child relationships in a protected environment, and to contribute to the improvement of the means allocated to them. In this perspective, the law of 14 March 2016 constitutes a significant lever. We would like these meeting times to be more closely considered in their potential of care, since the conditions are required to allow themselves to define them as such. We emphasize the need to promote the elaborative scope of these guidelines with respect to the placement measure for the child and the parent(s). The interest of this research is therefore to provide an understanding of how psychic work can be deployed in children and their parents during mediatized visits, and in this way, to change practices in this field.Mediated visits are a legal and social framework that organizes the maintenance of links between parents, holders of parental authority, and the child placed by court, which include functions of protection and assessment of the quality of the parent-child relationship and parental capacities. This first plan reflects the need to support these parents a developing parenting functions andresponsibilities towards the child, and in particular, the child's fundamental needs for psychological development and construction. At the clinical level, we consider two essential functions conferred on this device, which at the same time represent the psychological challenges of maintaining parent-child relationships. On the one hand, it is a question of treating in the child and in the parent the effects of the child's separation from his or her environment of origin, while also considering the inadequacies or sufferings resulting from the pathology of the family links or from an event that will have a traumatic value in the family psyche. On the other hand, it is a question of supporting the work of symbolization relating to the meaning of the protection measure, the process of parenting that is suffering or failing and the repetition of suffering in intra-family relationships, and in particular, in the parent-child relationship. Faced with these stakes, we advance the hypothesis that before operating as a clinical device potentially supporting this symbolization work, the device must be able to undergo a series of transformations. We formulated the existence of psychic processes specific to mediatization that would make it possible to set up the system of mediatized visits as a clinical device promoting the symbolization of the subjects involved (child, parent and clinician). We also believe that it is through the clinical work of mediatization, supported by the investment of the clinician involved in a symbolic function of a malleable medium, that children and parents deploy a work of symbolization in contact with this device. This would thus involve the establishment of a secure background, the movement of conscious and unconscious psychic content generated by the establishment of the parental relationship and the deployment of the experience of parenthood, and the triadization of the framework and object, a process that constitutes the driving force behind the system of mediated visits. Considering clinical practice as a common thread, it has given us the opportunity to address the diversity of family configurations encountered in the field of child protection. This exploration led us to rely on what defines parenting, and in particular the process of a subject in an environment that is sufficiently supportive and sensitive to the needs of the subject in a kinship and parenting situation
Laroui, Sarah. « Classification et modélisation de la croissance du champignon Botrytis cinerea à partir d’imagerie microscopique : vers l’établissement de liens entre phénotypes et molécules antifongiques ». Thesis, Université Côte d'Azur, 2021. http://www.theses.fr/2021COAZ4086.
Texte intégralPhytopathogenic fungus are the cause of significant economic losses. Among them, botrytis cinerea is particularly destructive. Therefore, anti-fungal molecules are developed for crop protection. They are classified according to their Mode of Action, whose understanding is necessary to infer how the active compounds block the metabolic functions or intracellular signaling pathways of the fungus. Some molecules can induce dramatic morphological changes of a fungus, the so-called phenotypes, that are observable in microscopy and can be associated with the (known or unknown) mode of action of the molecule. Each molecule must be tested at various concentrations since the phenotype is exhibited only above a certain dose. To date, the analysis of microscopy images is done manually. Therefore, it represents a significant cost which can be drastically reduced by computer analysis. Within this framework, this PhD thesis aims at discovering the relationships “Family of Molecules <=> Mode of Action <=> Phenotype” for new molecules. In order to characterize the different phenotypes of Botrytis cinerea, we developed an automatic analysis of the microscopy images. The first steps rely on image processing and extraction of morphometric features. Then, a method of automatic classification of the phenotypes including a rejection class for unknown phenotypes was developed. It proposes a general strategy in a supervised context based on three main steps: learning a model independently for each class, learning one threshold per model based on the interactions between the classes, and a prediction procedure based on the responses of models with respect to their threshold. An "expert system" able to take into account all the decisions at the different concentrations of a molecule has been developed to propose a hypothesis of the Mode of Action of the molecule. Besides the conclusion on the mechanism of action, this procedure allows to obtain an analysis of the tested molecule, in particular by providing indications on its degree of effectiveness. We have also developed an alternative classification approach based on optimal transport whose strength lies in its ability to take into account the geometry of the sample distribution. We proposed to transform the data so that they follow a simple model (in practice a Gaussian model), the complexity of the data then being "hidden" in the transport transformation. Note that this approach also offers an original way to estimate the probability density function underlying a population sample. Finally, we studied the growth of the fungus over time in order to understand or even predict the appearance of a phenotype. For each phenotype, different morphometric features are estimated from temporal sequences in microscopy. This is done by analyzing the evolution of these features as a function of the tested molecule, its concentration, and the incubation time. Then, we designed growth models calibrated from these ground-truth data. The models are discrete-time stochastic processes using discrete and continuous probability laws to control the triggering of the different events (growth, creation of a branch, etc.) and their magnitude. We then simulated the growth of fungi in contexts corresponding to different phenotypes. This work has provided a better understanding of the growth of Botrytis cinerea in the presence of an antifungal molecule, i.e., for a given mode of action
Jeandet, Louise. « Modélisation numérique des liens entre séismes et glissements de terrain au cours du cycle sismique : processus déclencheurs, distributions de tailles et implications géologiques ». Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1B063/document.
Texte intégralInteractions between tectonic processes and erosion have been poorly investigated at short time-scales (<1000 years). However, earthquakes can largely contribute to the erosion of mountain belts by triggering widespread landsliding. Moreover, recent studies have shown that such large erosional events could induce stress changes in the fault environment efficient enough to influence regional seismicity. In this thesis, this problematic is tackled through a numerical approach. Firstly, the development of a simple mechanical model accounting for the complexity and variability of natural hillslopes allowed to demonstrate the role of mechanical parameters (cohesion and friction), and of hillslope shape in the probability density function of landslide sizes. This model has been validated using natural cases of co-seismic landsliding. Secondly, the role of unstable hillslope height on large landslide probability has been demonstrated based on natural data, and the exponential distribution of this unstable height has ben shown. Finally, the potential effect of a large erosional event on seismicity has been explored with a numerical model of seismic cycle, in which has been implemented temporal normal stress variations. The results emphasize the role of eroded sediment volume, but also of the export time of sediments away from the mountain belt. In landscape with high unstable hillslopes, large landslides are favored and in turn, could induce fast an important enough erosion to modify regional seismicity
Morel, Hervé. « Modélisation et simulation des composants et des systèmes électroniques de puissance ». Habilitation à diriger des recherches, INSA de Lyon, 1994. http://tel.archives-ouvertes.fr/tel-00731059.
Texte intégralCarvalho, De Aguiar Fernando Jorge. « Modélisation d'un système de recherche d'information pour les systèmes hypertextes. Application à la recherche d'information sur le World Wide Web ». Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2002. http://tel.archives-ouvertes.fr/tel-00818333.
Texte intégralCarvalho, de Aguiar Fernando Jorge. « Modélisation d'un système de recherche d'information pour les systèmes hypertextes : Application à la recherche d'information sur le world wide web ». Saint-Etienne, EMSE, 2002. https://tel.archives-ouvertes.fr/tel-00818333/document.
Texte intégralIn a hypertext documents are seldom composed of a set of nodes instead of a single one. The information one page conveys might not be fully grasped if only the content of it is considered. The content of the pages with which the page being considered compose one document bear contextual information. Taking into account contextual information when indexing pages is fundamental to the quality of their index. Information retrieval systems for the Web, commonly known as Web search engines, should consider the splitting up of Web documents into several pages: one page should not be considered as a fully-fledged document, it is only a part of it. Therefore, when indexing a page one should consider its contextual information which is seldom located in its neighborhood. Traditionally, Web search engines consider pages as fully-fledged documents and their index are then built only from their contents. Contextual information is not considered. In this work we put forward a new information retrieval model for search engines running over Web sites. The cornerstone of it is a 2-level index for the pages composing the site: the bottom level is constructed solely from the content of the page itself, and the top level is constructed from the analysis of the contents of the pages which give a context to the page being indexed. We aim to improve the effectiveness of the search engine by improving the quality of the pages' index. The implementation of a search engine prototype integrating the model suggested and the use of the test collection WT10g issued from the TREC conferences and adapted to our needs, allowed us to carry out a large number of tests. The results of these tests showed an improvement of the effectiveness of the search engine prototype when compared with that of a search engine integrating a traditional model where contextual information is not used to index pages. Therefore, the tests unveiled evidence that contextual information might be worth considering when modelling a search engine
Campolina, Bruno L. « Modélisation vibroacoustique de double-parois aéronautiques avec liens mécaniques par la méthode de l'analyse statistique énergétique : = Vibro-acoustic modelling of aircraft double-walls with structural links using statistical energy analysis ». Paris 6, 2012. http://www.theses.fr/2012PA066157.
Texte intégralThe prediction of aircraft interior noise involves the vibroacoustic modelling of the fuselage with noise control treatments. The goal of this work aims at tailoring the noise control treatments taking design constraints such as weight and space optimization into account. For this purpose, a representative aircraft double-wall is modelled using the Statistical Energy Analysis (SEA) method. Laboratory excitations such as diffuse acoustic field and point force are addressed and trends are derived for applications under turbulent boundary layer excitation. The effect of the porous layer compression on the transmission loss is firstly addressed. Then the transmission through structural connections between panels is analysed. Finally, the dominant sound transmission paths are identified in the 100 Hz to 10 kHz frequency range in order for adapted noise control means to be derived
Lagüe, Patrick. « Modélisation et simulations numériques de l'effet des liens hydrogène et de l'hydratation dans les bicouches lipidiques : applications à la DMPE pure et à des mélanges de DMPE et de cholestérol ». Thèse, Université du Québec à Trois-Rivières, 1996. http://depot-e.uqtr.ca/5128/1/000623620.pdf.
Texte intégralNader, François. « Modélisation de la rupture 3D des grains polyédriques par éléments discrets ». Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI082/document.
Texte intégralRockfill structures are very popular among civil engineering structures (dams, retaining walls, . . . ). Important settlements can take place during the lifetime of these structures, settlements mainly caused by the breakage of rockfill grains. This thesis proposes a numerical model that allows the simulation of the behavior of granular materials exhibiting grain breakage. To take into account the discrete nature of these media, the discrete element method is chosen. The adopted strategy is the Non-Smooth Contact Dynamics method, where grains are considered to be rigid. To generate blocks having complex shapes, a 3D grain model is suggested. This grain model is then discretized into tetrahedral subgrains, joined together using cohesive bonds so that breakage can be simulated. A Mohr-Coulomb failure criterion is used for the cohesive bonds. The model is implemented into the LMGC90 software platform. At first, the model is tested in single grain crushing simulations between two plates. Multiple parameters controling the strength of the grain are studied : the intra-granular cohesion, the size, the discretization and the orientation of the grain. The scale effect that characterizes this type of material is verified. Then the model is tested in numerical simulations of œdometric compression of rockfill. The influence of the parameters of the model and of those of the granular medium are studied. The results of œdometric simulations are compared to experimental results, and present a good agreement. Lastly, numerical experimentations are conducted in order to study the energies that are brought into play in the simulations. The surface creation energy is estimated for this type of material. Results are close to the data provided in the literature
Ho, Thi Kim Thoa. « Modélisation et analyse des réseaux complexes associées à des informations textuelles : les apports de la prétopologie, du topic modeling et de l’apprentissage automatique à l’étude de la dynamique des réseaux sociaux, la prédiction de liens et la diffusion des sujets ». Thesis, Université Paris sciences et lettres, 2020. http://www.theses.fr/2020UPSLP047.
Texte intégralThis thesis deals with the concept of complex network associated with textual information. We are interested in the analysis of these networks with a perspective of application to social networks. Our first contribution consisted in building an analysis model for a dynamic social network using the agent based modeling (ABM) approach, author-topic modeling (ATM), and using the mathematical framework of pretopology to represent the proximity of the subjects. Our modeling is called Textual-ABM. Our proposal has been to use author-topic modeling to estimate user interest based on text content and to use pretopology to model several relationships and to represent a set of neighborhoods that is more elaborate than a simple relationship. Our second contribution concerns the diffusion of information on a "heterogeneous" social network. We propose to extend the independent cascade epidemic diffusion model (IC) and the pretopological cascade diffusion model that we call Textual-Homo-IC and Textual-PCM respectively. For Textual-Homo-IC, the probability of infection is based on homophilia (resemblance of agents) which is obtained from the textual content using the topic modeling. For Textual-PCM, a pseudo-closure function with different strong levels is proposed to realize a more complex set of neighborhoods. In addition, we propose to use supervised learning to predict the diffusion of a topic with a combination of intrinsic or external factors. Our third contribution concerns the prediction of relationships between co-authors with the addition of a new topological feature related to geographical factors and content features using topic modelling. All this work was achieved by the design of specific algorithms and validated by experiments
Ahriz, Hatem. « Modélisation automatique de systèmes physiques : application au diagnostic ». Chambéry, 1998. http://www.theses.fr/1998CHAMS013.
Texte intégralGiraud, Frédéric. « Modélisation causale et commande d'un actionneur piézo-électrique à onde progressive ». Lille 1, 2002. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2002/50376-2002-109-110.pdf.
Texte intégralDet, Franck. « Modélisation en bond graphs simulation et commande d'une pince à souder electropneumatique ». Lyon, INSA, 1991. http://www.theses.fr/1991ISAL0007.
Texte intégralThe present thesis concerns a feasibility study of an electro pneumatic welding gripper. The choice of a pseudo bond graph representation of the restrictions and the chambers of the pneumatic section is justified in the first chapter. The establishment of a rigid arm welding gripper model illustrates the combination of the pseudo bond graph model of the pneumatic section on the gripper and. Of the multi bond graph model of the mechanical section. The second chapter presents the model developed for the experimental and simulated study of the position or force control feasibility of a gripper for which the arms are considered rigid. For this study, the gripper constituent load was simulated to an inertial load and an original model of the servovalve was developed. This model reproduces the different functioning particularities of the servovalve. The position control is based on the use of a pole placement method with variable gains. The force control based on a behaviour model uses a proportional corrector. The third chapter presents the experimental and simulated study results undertaken on a prototype model for the different phases of the functioning made separately and for complete cycles. The gripper model developed on the fourth chapter takes into account the flexibility of each of the gripper arms. This model is used for the simulation of the flexible gripper behaviour during complete cycle
Maré, Jean-Charles. « Contribution à la modélisation, la simulation, l'identification et la commande d'actionneurs électrohydrauliques ». Lyon 1, 1993. http://www.theses.fr/1993LYO10002.
Texte intégralBidard, Catherine. « Graphes de liaison torsoriels pour la modélisation et l'analyse ciné-statiques des mécanismes ». Lyon 1, 1994. http://www.theses.fr/1994LYO10122.
Texte intégralBusson, Frédéric. « Les bond graphs multiénergies pour la modélisation et la surveillance en génie des procédés ». Lille 1, 2002. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2002/50376-2002-253.pdf.
Texte intégralDrapier, Sylvain. « Modélisation multi-échelle des structures composites, comportement en compression et lien avec les procédés ». Habilitation à diriger des recherches, Université Jean Monnet - Saint-Etienne, 2002. http://tel.archives-ouvertes.fr/tel-00562396.
Texte intégralParra, Carlos. « Towards Dynamic Software Product Lines : Unifying Design and Runtime Adaptations ». Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2011. http://tel.archives-ouvertes.fr/tel-00583444.
Texte intégralVerchère, Alban. « Essais sur le lien entre développement durable et équité intergénérationnelle : une approche par la modélisation ». Strasbourg 1, 2002. http://www.theses.fr/2002STR1EC08.
Texte intégralThe matter of durability of the economic and human development with limited resources and fragile environment appears at least as old as Economic Science. It took since the Eighties and the dissipation of the less founded fears related to the exhaustion of resources, an environmental dimension through the concept of sustainable development. It says that development "must meet the needs of the present without compromising the ability of future generations to meet their own needs" Brundtland Commission (1987). From a theoretical point of view, it appears that this definition returns in fact to two closely related but quite distinct concepts: sustainability on the one hand, and equity between generations of the other. However, these two concepts are often confounded in the literature, as well as one frequently associates their opposites, unsustainability and inequity. The reason lies in the fact that one appreciates the paths of development to the ell of their long term results, but without really wondering about the behavior of the generations which give them life : are the generation really iniquitous? The work exposed in this thesis, through four modeling essays, precisely aims at showing that there are unsustainable paths of development that cannot be described as inequitable, As well as it happens one reaches sustainable paths, without the possibility to qualify them as equitable. These conclusions finally lead to reinvest the question of the ethical base of the interventions in favor of the future in the event of unsustainable but equitable paths of development. Namely, if these paths lead to unsustainability but without it being possible to say if they violate intergenerational equity as that can appear when one introduces intergenerational altruism for example , which principle can provide an alternative to equity between generations to legitimate the actions in favor of the future?
Larnier, Kévin. « Modélisation thermohydraulique d’un tronçon de Garonne en lien avec l’habitat piscicole : approches statistique et déterministe ». Thesis, Toulouse, INPT, 2010. http://www.theses.fr/2010INPT0079/document.
Texte intégralFish species with strong thermal requirements (i.e. Atlantic salmon) are very sensitive to temperature evolution and particularly to large increases. An investigation conducted on the Garonne River (France) during the last three decades revealed global water warming along with an increase of the high temperature period duration. Large impact of this evolution on the survival and breeding of migrating fish species was also reported. Study was thus conducted on a specific reach of the Garonne River located between the immediate upstream of Toulouse and the upstream of the Malause dam. The issue of water temperature warming is particularly relevant on this reach, with an average increase of 2°C between upstream and downstream and temperatures above 25°C frequently reported. Potential causes are numerous: drastic low-flow regime (quoting SDAGE Adour-Garonne), impacts of surface fluxes that are important due to bed shape (wide and shallow), anthropogenic impacts, etc. Large amount of climatic and hydraulic data are used to make a clear determination of the processes involved in the thermal regime evolution of this reach. Trend and correlation analyses and use of statistical models indicate the strong relation between stream temperature and climate. Low flows also seem to be related to water temperatures during summer periods. Statistic and deterministic models give good results in estimating high daily mean water temperatures (RMSE ranging from 0.99°C to 1.22°C) and predicting water temperatures threshold crossings related to the migrating conditions of Atlantic salmon.Finally, a one-dimensional numerical model that solves both shallow water and thermal equations is developed. Both the formulation of the St-Venant equations (high variability in slope, gates …) and the phenomena taken into account in the water temperature model (lateral influx, surface fluxes, bed conduction …) allows studying the evolution of fluxes driving water temperature evolution. Future evolution of the water temperature at the 2050 horizon is also evaluated using IPCC models output and potential solutions to restore favorable stream temperatures conditions for fishes are analyzed
Baaiu, Ahmed. « Approche hamiltonienne pour la modélisation, l'estimation et la commande d'un procédé de séparation ». Lyon 1, 2007. http://www.theses.fr/2007LYO10073.
Texte intégralThe objective of this work is to develop a geometrical approach for modelling the mass transfer phenomena in a separation process. This approach is based on the Hamiltonian modelling of physical systems, consequently on the expression of energy in the system and the energy flux between the various phenomena appearing within such a system (dissipation, accumulation, conversion). We proposed a choice of system variables in order to put out a compositional model (network model) of the systems of mass transfer in the isothermal and non isothermal cases. We highlighted a geometrical structure, Stokes-Dirac structure, which relates canonically the different energetic phenomena in the system. In order to simulate the dynamics of the models we also present an original method for the spatial discretization of the Stokes-Dirac structure and also for the different components of the model
Garcia, Gomez Janette. « Approche bond graph pour la modélisation des effets thermiques dans les composants de commutation en électronique de puissance ». Lille 1, 1997. http://www.theses.fr/1997LIL10069.
Texte intégralLautier, Philippe. « Modélisation des convertisseurs à découpage pour la conception et la commande : application à l'onduleur ». Lyon, INSA, 1998. http://theses.insa-lyon.fr/publication/1998ISAL0001/these.pdf.
Texte intégralThe large time scale disparity of switching converter based Systems, implies prohibitive simulation times for the conception of global Systems or control loops. We présent a systematic method to build the équivalent averaged electric circuits, usually called "averaged models". Those models represent with a good accuracy the "slow variables" (compared to the switching frequency). The model building method is based on bond graph formalism and algebraic causality analysis. Thus the simulation divergence risks are limited. The parameters measurement and Computing methods are presented and compared with the behavioural model needs. The averaged model parameters are easier to identify than the behavioural model ones. A 30kW test bench, with a real time control System, has been developed in order to validate the simulations. The results are pretty close to the expérimentation. Then the parameter sensitivity of the model has been discussed in order to simplify the model and its parameter extraction phases. In the main cases, we only need to take the dead times into account. Finally, an example of using the averaged model in Automatics is given. We compensate the converter distortions in order to generate idéal signais. This compensation has been put into opération in our test bench and gives good results. The processing time of the control loop was not increased by the compensation algorithm
Kupper, Mireille. « Estimation et modélisation du lien entre deux processus à indices dans ℤ², et applications à l'épidémiologie ». Paris 11, 1985. http://www.theses.fr/1985PA112313.
Texte intégralStudy of some estimators of the trend and the correlations of a Gaussian bivariate process indexed by ℤ² with a linear trend and stationary covariances, such as the exact or approximated maximum likelihood estimators and the empirical estimators. Study of a regression model with spatial structure for the Gaussian bivariate process indexed by ℤ² specifying the form of the relation between the first and second components of the process. Application to an epidemiological example: the research of the relation between a given factor (alcoholism _rate/French department) and the prevalence of a disease (death rate of esophagus cancer/French department) by modelling the factor and the disease with a bivariate process indexed by ℤ²
Mit, Corentin. « Modélisation mécaniste de la dynamique de biomarqueurs chez les poissons téléostéens : lien entre exposition et effetsprécoces ». Electronic Thesis or Diss., Paris, AgroParisTech, 2023. http://www.theses.fr/2023AGPT0001.
Texte intégralBiomarkers are useful tools for the diagnosis of environmental risk in aquatic ecosystems. Nevertheless, the measurement of these sub-individual markers still presents some limitations for the assessment of ecosystem health, including the characterisation of the complex dynamics of responses of these non-lethal effects as a function of time or dose, or the extrapolation of responses from one scale of biological organisation to another. One of the solutions that seems promising for characterising the dynamics of these responses from a change of scale perspective would be to integrate the biomarkers into mechanistic models that make it possible to predict these dynamics and explain the mechanisms underlying the effects. This thesis proposes to build mechanistic models of physiologically based toxicokinetics and toxicodynamics (PBTK-TD) to better characterise and understand the response dynamics of biomarkers. In this context, the problem of biomarker dynamics was divided in two. First, the "toxico-kinetic" or TK makes it possible to link the external dose, present in the environment, to the internal dose, present in the organism. Second, the "toxico-dynamic" or TD, makes the link between the internal dose and the effect. Accordingly, the first step in this thesis was to collect a set of TK and TD data in our model species, the three-spined stickleback, on a family of compounds, the bisphenols, and more specifically, BPA, BPS and BPF. These data, collected from short-term exposures (seven days of contamination and seven days of depuration) and long-term exposure (21 days), were used to compare the modulating effects of bisphenols on biomarkers. In particular, markers of innate immunity were strongly impacted by these substances. Differences in kinetics between BPA and BPS were also highlighted. Subsequently, the data collected during the exposures were used to build a physiologically based TK model (PBTK) for BPA, then a PBTK model coupled with TD sub-models (PBTK-TD) describing the dynamics of certain immunomarkers in the stickleback. Finally, a last PBTK-TD model was built to demonstrate the feasibility of this modelling approach for integrating exposure conditions more representative of those in the natural environment, i.e. for a mixture of substances. Taken as a whole, this thesis demonstrates the attractiveness of coupling the experimental approach consisting in measuring biomarkers and modelling
Garrab, Hatem. « Contribution à la modélisation électro-thermique de la cellule de commutation MOSFET-Diode ». Lyon, INSA, 2003. http://www.theses.fr/2003ISAL0009.
Texte intégralThe simulation of power semiconductor devices and power converters is a strategic research area for the future. Indeed, the fabrication of a prototype demands more and more spend time. So, virtual prototyping, i. E. The accurate simulation of power converters, is a strong need. The job corresponds to the analysis of the possibilities in numerical simulation based on the finite Element-method of the switching cell MOSFET-diode. Particularly, the Electro-thermal modelling of the PIN diode has been obtained. More over an original technological-parameter extraction-method has enabled to obtain excellent agreements between simulation and experiment-results, even in the case of switching phases. This objective has been reached because of the accurate modelling of the wiring elements. Finally, an Electro-thermal coupling analysis has enabled to develop a bond graph model representing temperature gradients that occur during a self-heating phase
Wlazlak, Anne. « L'influence de la construction communautaire sur la constitution française ». Phd thesis, Université d'Avignon, 2013. http://tel.archives-ouvertes.fr/tel-01059135.
Texte intégralMahiddini, Florian. « Modélisation couplée Compatibilité Électromagnétique - Thermique d’architectures de câblages électriques embarquées ». Thesis, Toulouse, ISAE, 2018. http://www.theses.fr/2018ESAE0007/document.
Texte intégralThe on-going development of “more” or “all” electrical aircraft leads to the design of ever-complex embeddedelectrical networks, which causes a significant increase of electrical cables to be used within these innovativevehicles. Among the constraints encountered during the definition and integration phases of the network, thoserelated to the electromagnetic compatibility between equipment as well as the management of thermal heatingby Joule’s effect become more and more stringent. Thus, this thesis is dedicated to the development of anoriginal methodology enabling the prediction of both induced and crosstalk currents as well as the heating upstate in complex bundles of cables. Indeed, literature review explicitly shows that electrostatic and stationaryheat transfer phenomena are, from a mathematical standpoint, strictly the same which allows the simultaneouscomputation of these two problems for an arbitrary network. This research work demonstrates that the determinationof primary electrical parameters (per unit length) and the temperature distribution within a givencross-section can be handled with the numerical Method Of Moment (MoM). This choice is motivated by theseveral inherent advantages of the method like an optimized use of the computer resource and the naturalparallelization of the algorithms. The developed numerical tools, intended to be fully integrated in the in-housesoftware suite CRIPTE, has been validated during an experimental campaign that has involved several typesof bundles. Although the comparisons between experimental and simulated results comply with each other,experiments reveal the hard task of getting a precise estimation of the heat transfer coefficients, even in awell-controlled environment. Finally, these works open new and very promising perspectives for future EWIS(Electrical Wiring Interconnection System) in term of mass optimization
Edibe, Bénédicte. « Modélisation et simulation de systèmes dynamiques par les bond graphs : application aux systèmes mécaniques polyarticulés ». Rennes 1, 1995. http://www.theses.fr/1995REN1A007.
Texte intégralCoutereel, Luc. « Étude et réalisation d'un processeur d'aide à la modélisation des systèmes dynamiques par l'approche Bond-Graph ». Lille 1, 1991. http://www.theses.fr/1991LIL10003.
Texte intégralAndrieu, Cindie. « Modélisation fonctionnelle de profils de vitesse en lien avec l'infrastructure et méthodologie de construction d'un profil agrégé ». Phd thesis, Université Paul Sabatier - Toulouse III, 2013. http://tel.archives-ouvertes.fr/tel-00915420.
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