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Статті в журналах з теми "Modèle différentiable":
Baker, A., N. Ray та L. Schwartz. "Hypersurfaces Framées et L'Élément β1, de Toda". Canadian Mathematical Bulletin 30, № 2 (1 червня 1987): 215–22. http://dx.doi.org/10.4153/cmb-1987-031-0.
Bronsard, Camille, and Lise Salvas-Bronsard. "De la variété de Patinkin-Malinvaud à l’optimum macroéconomique de court terme." L'Actualité économique 68, no. 1-2 (March 10, 2009): 205–24. http://dx.doi.org/10.7202/602065ar.
Дисертації з теми "Modèle différentiable":
Fauthoux, David. "Des grains aux aspects, proposition pour un modèle de programmation orientée-aspect." Toulouse 3, 2004. http://www.theses.fr/2004TOU30100.
Current programming technologies do not able to clearly separate crosscutting concerns. The code of a concern is scattered into the program components. After having detailed and analysed four main aspect-oriented systems, this report presents a fine-grained model. These grains, the "lenses", are grouped to create more abstract components. The first step of the report describes a "flow" as a chain of lenses. A program can be defined as a set of intersecting flows. The second step of the report comes to the "aspect" concept, applied onto specified points of the program. These abstract groups (flows and aspects) are exactly shaped like lenses. Thus the model is consistent from the bottom level (classes) to the more abstract ones (groups, and groups of groups). The main goal of this report is to enable to express as brightly as possible the structure of the program. The model walks on the way which aims at splitting the program architecture building phase from the component writing phase. Architect is a job which requires composition skills and tools. It is to be separated from the developer job which uses and manipulates the program language to write components
Gavagsaz, Ghoachani Roghayeh. "Comportement dynamique non-linéaire dans les convertisseurs statiques : régulateurs de courant et stabilité des réseaux DC." Electronic Thesis or Diss., Université de Lorraine, 2012. http://www.theses.fr/2012LORR0102.
This thesis discusses the study of dynamic behavior in power electronics systems. The nature of cycles defined by the state variables of the system can be settled either by a bifurcation diagram or by Floquet multipliers obtained from the discrete model of the converter. However, for certain structures of static converters, a discrete model cannot be obtained without introducing large assumptions. The flip bifurcations (fast-scale) cannot be predicted by the averaged model whereas they appear in many statics converters. A new formulation of a continuous averaged model is presented to estimate the first bifurcation point (flip, Hopf ...). The proposed methodology is applied to a boost converter, operated in continuous conduction mode, controlled by different types of fixed frequency switching current controllers. Then, this averaged model is used for the design of the current controller parameters associated with an active filter system. The variables obtained by the proposed model have been validated by numerical simulation and experimental results. Methods of analysis of limit cycles are extended to study the stability of DC networks when the cutoff frequency of the LC filter between the voltage source and the converter is close to the switching frequency of converters. Different discrete-time models have been developed in order to consider whether to use sampled or no-sampled converter control
Baldi, Guillaume. "Contributions à la modélisation procédurale de structures cellulaires stochastoques 2D et à leur génération par l'exemple." Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAD001.
The creation of procedural materials and textures requires considerable expertise, and is time-consuming, tedious and costly. We are therefore looking to develop tools for the automatic generation of procedural textures and materials from input exemplars provided in the form of images: This is known as inverse procedural modeling.In this thesis, we propose a procedural model called Cellular Point Process Texture Basis Function (C-PPTBF) for representing 2D stochastic cellular structures, involving functions that are differentiable with respect to most of their parameters, making it possible to estimate these parameters from examples without resorting entirely to deep neural networks. We have set up a processing pipeline to estimate the parameters of our model from structural examples provided in the form of binary images, combining an estimation performed using a convolutional neural network trained on images produced with our C-PPTBF model and an estimation phase using gradient descent directly on the parameters of the procedural model
Ndiaye, Ismaïla Abderhamane. "Résolution de problèmes multicritères (durée/sécurité) pour la conception de plans d'évacuation de personnes." Thesis, Tours, 2016. http://www.theses.fr/2016TOUR4001/document.
The work presented in this thesis aims to propose methods for routing a mass population through a disturbed network whose data vary over time. This problem can be illustrated by disasters due to humans or natural events where people (potentially) affected have to leave their living places for a period of one to several days. In the literature, mass routing are often modeled as dynamic flow problems whose objective is to minimize the overall duration of the evacuation process from a set of gathering points towards another set of shelter locations. However few papers take into account the concept of safety during this routing nor deploying task forces that can secure or facilitate this process. In this context, the safety security can be seen as a danger affecting the quality of life of people we organize the trip. In this context, the safety can be seen as a danger that influence the health of the people we are trying to evacuate. Indeed, this hazardous event can be related to a radioactive cloud, a fire, a tsunami, an earthquake or a flooding which make some of paths becoming dangerous or less usable by evacuees
Cellier, Dominique. "Deux extensions des résultats classiques sur les estimateurs à rétrécisseur : cas de rétrécisseurs non différentiables ; cas de lois à symétrie sphérique." Rouen, 1986. http://www.theses.fr/1986ROUES044.
Dkhil, Fathi. "Analyse de systèmes de réaction-diffusion-advection apparaissant dans des modèles de chimie et de biomathématiques." Cergy-Pontoise, 2002. http://www.theses.fr/2002CERG0143.
In this work, we study some examples of reaction-diffusion-advection systems which appear in models of physics, chemistry and biology. In the first, part we study the Gray-Scott system, which modelizes a cubic autocatalytic reaction. We first establish the global existence and uniqueness of a non trivial solution of this system in a bounded domain. We also prove the non-existence of non-constant stationary solution and of traveling pulse for some domain of parameters. As for traveling waves we first give an exact solution in the bistable case. Using a perturbation method and a fixed point argument, we show that this solution still exists near this case. In the second part we are interested in traveling wave solutions of a cross-diffusion system modelizing a combustion phenomenon in a porous medium. Using the topological degree method, we show the existence of a solution of the problem in a bounded domain. Then, by a compactness argument, we show that the solution obtained this way converges to a solution of the limit problem over on the line. In the last part, we study the singular limit of a degenerate reaction-diffusion-advection equation modelizing a chemotaxis phenomenon. We prove the convergence to a solution of a free boundary problem where the equation of the interface motion is a first-order Hamilton-Jacobi equation. The proof is based on the comparison principle and on the construction of sub- and super-solutions
Gavagsaz, Ghoachani Roghayeh. "Comportement dynamique non-linéaire dans les convertisseurs statiques : régulateurs de courant et stabilité des réseaux DC." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0102/document.
This thesis discusses the study of dynamic behavior in power electronics systems. The nature of cycles defined by the state variables of the system can be settled either by a bifurcation diagram or by Floquet multipliers obtained from the discrete model of the converter. However, for certain structures of static converters, a discrete model cannot be obtained without introducing large assumptions. The flip bifurcations (fast-scale) cannot be predicted by the averaged model whereas they appear in many statics converters. A new formulation of a continuous averaged model is presented to estimate the first bifurcation point (flip, Hopf ...). The proposed methodology is applied to a boost converter, operated in continuous conduction mode, controlled by different types of fixed frequency switching current controllers. Then, this averaged model is used for the design of the current controller parameters associated with an active filter system. The variables obtained by the proposed model have been validated by numerical simulation and experimental results. Methods of analysis of limit cycles are extended to study the stability of DC networks when the cutoff frequency of the LC filter between the voltage source and the converter is close to the switching frequency of converters. Different discrete-time models have been developed in order to consider whether to use sampled or no-sampled converter control
Fourdrinier, Dominique. "Deux extensions des résultats classiques sur les estimateurs à rétrécisseur : cas de rétrécisseurs non différentiables ; cas de lois à symétrie sphérique." Rouen, 1986. http://www.theses.fr/1986ROUES043.
Barbaroux, Cécile. "Analyse et modélisation des flux de carbone de peuplements forestiers pour la compréhension de la croissance de deux espèces feuillues Quercus petraea et Fagus sylvatica." Paris 11, 2002. http://www.theses.fr/2002PA112084.
Several dendroecological studies (inter-annual variations of the tree-rings width according to the climate) of the sessile oak (ring porous species) and of the beech (diffuse porous species) put into evidence their interrelationships with the climatic signal of the year and differed effects of the climate or the growth. These differed effects are often more obvious and older on oaks. Our objectives are to verify if the anatomies and/or the contrasted phenology (setting up of leaves, resuming of wood growth) of these two species entail a different management of carbohydrate reserves, and of specific carbon allocation pattern, at intra- and in inter-annual scales. To reach these objectives, we have developed a pluridisciplinary approach associating dendrochronology, ecophysiology, dendrometry and modeling of water and carbon functioning of oaks and beeches stands. The analysis of the inter-annual variations of radial growth of the oak and of the beech was based on the last 30 years measurements on 900 varied trees in terms of fertility and age in the Fontainebleau forest. Dendroclimatic study puts into evidence a strong dependence of the beeches stands productivity on the soil water availability during the season of vegetation of the year and the previous year. For oaks stands, the productivity is correlated to the soil water availability during the season of vegetation and to the growth of the previous year. The biochemical analysis of carbohydrate reserves (starch, sucrose, glucose and fructose), made on two pure stands of oaks and beeches of 35 years old in Lorraine, reveals a seasonal dynamics of reserves more obvious as well as an higher concentration for the oak. These differences of reserve management correspond to the important needs in growth of the oak during the phase of carbon heterotrophy. Analyzing the reserves quantities and yearly growth in biomass of the population on several years required preliminary works to describe intra- and inter-trees variability and then to up-scale the studied tree to the stand. Knowledge acquired on the seasonal dynamics of carbohydrate reserves quantities, as well as on the growth phenology of the oak and the beech, have been integrated in a model of stand carbon balance (CASTANEA, E. Dufrêne). The possible changes of carbon allocation to the growth between years can be tested thanks to the model, through hypotheses of interactions between dynamics appropriate in reserves and growth. These modifications have been tested on the Fontainebleau site. .
Petrou, Georgios. "Dimensionnement robuste des réseaux de télécommunication face à l'incertitude de la demande." Paris 1, 2008. http://www.theses.fr/2008PA010037.
Книги з теми "Modèle différentiable":
Sandefur, James T. Discrete dynamical systems: Theory and applications. Oxford [England]: Clarendon Press, 1990.
Farkas, Miklós. Dynamical Models in Biology. Academic Press, 2001.
Farkas, Miklós. Dynamical Models in Biology. Academic Press, 2001.
Farkas, Miklós. Dynamical Models in Biology. Elsevier Science & Technology Books, 2001.
Sandefur, James T. Discrete Dynamical Systems: Theory and Applications. Clarendon Press, 1990.