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Статті в журналах з теми "Réduction de modèle (ROM)"
Gillet, Michaël, and Serge Brochu. "Institutionnalisation des stratégies de réduction des méfaits au sein de l’agenda politique canadien : les enjeux et les limites de la conceptualisation actuelle." Drogues, santé et société 4, no. 2 (March 22, 2006): 79–139. http://dx.doi.org/10.7202/012601ar.
Повний текст джерелаKistler, Max. "Réduction fonctionnelle et réduction logique." Philosophiques 27, no. 1 (October 2, 2002): 27–38. http://dx.doi.org/10.7202/004938ar.
Повний текст джерелаLe Bihan, Y., V. Martinage, P. Lessard, and E. Paul. "Influence possible des protozoaires sur le taux de mortalité des bactéries autotrophes nitrifiantes." Revue des sciences de l'eau 14, no. 1 (April 12, 2005): 91–108. http://dx.doi.org/10.7202/705411ar.
Повний текст джерелаSenou, Marcel, and L. Dempfle. "Simulation Monte-Carlo pour évaluer l’impact des schémas MOET adultes chez les bovins Somba." Revue d’élevage et de médecine vétérinaire des pays tropicaux 61, no. 2 (February 1, 2008): 115. http://dx.doi.org/10.19182/remvt.9997.
Повний текст джерелаOulefki, A., and A. Neveu. "Réduction par amalgame modal d'un modèle thermique." Journal de Physique III 3, no. 2 (February 1993): 303–20. http://dx.doi.org/10.1051/jp3:1993133.
Повний текст джерелаKim, Jaegwon. "L'émergence, les modèles de réduction et le mental." Philosophiques 27, no. 1 (October 2, 2002): 11–26. http://dx.doi.org/10.7202/004937ar.
Повний текст джерелаBeyrouthy, Joëlle. "Réduction 3D–1D d'un modèle viscoélastique en grandes déformations." Comptes Rendus Mathematique 345, no. 4 (August 2007): 239–43. http://dx.doi.org/10.1016/j.crma.2007.06.027.
Повний текст джерелаPucci, Muriel, Muriel Roger, and Julie Valentin. "Réduction du temps de travail: mise en évidence d’un effet sur l’offre de travail." Recherches économiques de Louvain 65, no. 4 (1999): 393–420. http://dx.doi.org/10.1017/s0770451800004693.
Повний текст джерелаThéoret, Raymond, and Pierre Rostan. "Les bandes de Bollinger comme technique de réduction de la variance des prix d’options sur obligations obtenus par la simulation de Monte-Carlo." Articles 81, no. 4 (April 12, 2007): 693–724. http://dx.doi.org/10.7202/014914ar.
Повний текст джерелаChachuat, B., N. Roche, and M. A. Latifi. "Réduction du modèle ASM 1 pour la commande optimale des petites stations d'épuration à boues activées." Revue des sciences de l'eau 16, no. 1 (April 12, 2005): 5–26. http://dx.doi.org/10.7202/705496ar.
Повний текст джерелаДисертації з теми "Réduction de modèle (ROM)"
Dubot, Claire. "Modélisation CFD thermohydraulique des générateurs de vapeur et application de techniques de réduction de modèle." Electronic Thesis or Diss., La Rochelle, 2022. http://www.theses.fr/2022LAROS029.
Повний текст джерелаNAVAL GROUP has been carrying out a R&D approach for the modeling and simulation of heat exchangers. This led to the thermal-hydraulic calculation code SIMEC-CFD based on the analogy between the tube bundle and a porous medium. In this work, the steam generator is studied. It is proposed here to use the mixture model where the drift velocity is reformulated as a function of slip in order to implement a model from the literature suitable to flows in tube bundles. SIMEC-CFD is defined mainly by correlations or empirical models. To compensate for the lack of data in the literature, this thesis evaluates the use of model reduction techniques based on POD (Proper Orthogonal Decomposition) in order to supply more precise elements to SIMEC-CFD. These are thus used to calculate the flow and for the inside-tube heat exchange coefficient by a intrusive reduced order model obtained by Galerkin projection on the POD basis and to define the outside-tube two-phase friction pressure loss by the interpolation of reduced solutions Bi-CITSGM. Finally, in the near future, the aim is to expand the system simulation of the secondary loop using SIMEC-CFD. However, these CFD simulations being costly in computation time and in resources, the non-intrusive model reduction by interpolation of the parametric coefficients of the whole heat exchanger is implemented
Mosquera, Meza Rolando. "Interpolation sur les variétés grassmanniennes et applications à la réduction de modèles en mécanique." Thesis, La Rochelle, 2018. http://www.theses.fr/2018LAROS008/document.
Повний текст джерелаThis dissertation deals with interpolation on Grassmann manifolds and its applications to reduced order methods in mechanics and more generally for systems of evolution partial differential systems. After a description of the POD method, we introduce the theoretical tools of grassmannian geometry which will be used in the rest of the thesis. This chapter gives this dissertation a mathematical rigor in the performed algorithms, their validity domain, the error estimate with respect to the grassmannian distance on one hand and also a self-contained character to the manuscript. The interpolation on Grassmann manifolds method introduced by David Amsallem and Charbel Farhat is afterward presented. This method is the starting point of the interpolation methods that we will develop in this thesis. The method of Amsallem-Farhat consists in chosing a reference interpolation point, mapping forward all interpolation points on the tangent space of this reference point via the geodesic logarithm, performing a classical interpolation on this tangent space and mapping backward the interpolated point to the Grassmann manifold by the geodesic exponential function. We carry out the influence of the reference point on the quality of the results through numerical simulations. In our first work, we present a grassmannian version of the well-known Inverse Distance Weighting (IDW) algorithm. In this method, the interpolation on a point can be considered as the barycenter of the interpolation points where the used weights are inversely proportional to the distance between the considered point and the given interpolation points. In our method, denoted by IDW-G, the geodesic distance on the Grassmann manifold replaces the euclidean distance in the standard framework of euclidean spaces. The advantage of our algorithm that we show the convergence undersome general assumptions, does not require a reference point unlike the method of Amsallem-Farhat. Moreover, to carry out this, we finally proposed a direct method, thanks to the notion of generalized barycenter instead of an earlier iterative method. However, our IDW-G algorithm depends on the choice of the used weighting coefficients. The second work deals with an optimal choice of the weighting coefficients, which take into account of the spatial autocorrelation of all interpolation points. Thus, each weighting coefficient depends of all interpolation points an not only on the distance between the considered point and the interpolation point. It is a grassmannian version of the Kriging method, widely used in Geographic Information System (GIS). Our grassmannian Kriging method require also the choice of a reference point. In our last work, we develop a grassmannian version of Neville's method which allow the computation of the Lagrange interpolation polynomial in a recursive way via the linear interpolation of two points. The generalization of this algorithm to grassmannian manifolds is based on the extension of interpolation of two points (geodesic/straightline) that we can do explicitly. This algorithm does not require the choice of a reference point, it is easy to implement and very quick. Furthermore, the obtained numerical results are notable and better than all the algorithms described in this dissertation
Dumon, Antoine. "Réduction dimensionnelle de type PGD pour la résolution des écoulements incompressibles." Phd thesis, Université de La Rochelle, 2011. http://tel.archives-ouvertes.fr/tel-00644565.
Повний текст джерелаSaleh, Marwan. "Étude mathématique et numérique des méthodes de réduction dimensionnelle de type POD et PGD." Thesis, La Rochelle, 2015. http://www.theses.fr/2015LAROS004/document.
Повний текст джерелаThis thesis is formed of four chapters. The first one presents the mathematical notions and tools used in this thesis and gives a description of the main results obtained within. The second chapter presents our generalization of a result obtained by Rousselet-Chenais in 1990 which describes the sensitivity of eigensubspaces for self-adjoint compact operators. Rousselet-Chenais were limited to sensitivity for specific subspaces of dimension 1, we have extended their result to higher dimensions. We applied our results to the Proper Orthogonal Decomposition (POD) in the case of parametric, temporal and spatial variations (Gappy- POD). The third chapter discusses the optical flow estimate with quadratic or linear energies at infinity. Mathematical results of convergence are shown for the method Progressive Generalized Decomposition (PGD) in the case of quadratic energies. Our proof is based on the decomposition of Brézis-lieb via the convergence almost everywhere of the PGD sequence gradients. A detailed numerical study is made on different types of images : on the passive scalar transport equations, whose displacement fields are solutions of the Navier-Stokes equations. These equations present a challenge for optical flow estimates because of the presence of low gradient regions in the image. We applied our method to the MRI image sequences to estimate the movement of the abdominal organs. PGD presented a superiority in both computing time level (even in 2D) and accuracy representation of the estimated motion. The local diffusion of standard methods (Horn Schunck, for example) limits the convergence rate, in contrast to the PGD which is a more global approach by construction. The last chapter deals with the application of PGD method in the case of variational elliptic equations whose energy present all challenges to classical variational methods : lack of convexity, lack of coercivity and lack of boundedness. We prove convergence results for the weak topology, the PGD sequences converge (when they are well defined) to two extremal solutions on the Nehari manifold. Several mathematical questions about PGD remain open in this chapter. These questions are part of our research perspectives
Tissot, Gilles. "Réduction de modèle et contrôle d'écoulements." Thesis, Poitiers, 2014. http://www.theses.fr/2014POIT2284/document.
Повний текст джерелаControl of turbulent flows is still today a challenge in aerodynamics. Indeed, the presence of a high number of active degrees of freedom and of a complex dynamics leads to the need of strong modelling efforts for an efficient control design. During this PhD, various directions have been followed in order to develop reduced-order models of flows in realistic situations and to use it for control. First, dynamic mode decomposition (DMD), and some of its variants, have been exploited as reduced basis for extracting at best the dynamical behaviour of the flow. Thereafter, we were interested in 4D-variational data assimilation which combines inhomogeneous informations coming from a dynamical model, observations and an a priori knowledge of the system. POD and DMD reduced-order models of a turbulent cylinder wake flow have been successfully derived using data assimilation of PIV measurements. Finally, we considered flow control in a fluid-structure interaction context. After showing that the immersed body motion can be represented as an additional constraint in the reduced-order model, we stabilized a cylinder wake flow by vertical oscillations
Vuong, Thi Thanh Thuy. "Réduction de modèle de crash automobile : application en optimisation." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC025.
Повний текст джерелаThe numerical simulation is more and more applied in the industry in order to reduce the physical tests costs. A crash simulation (pre-processing, processing and post-processing) takes about one or two days. Renault uses the optimization, so numerous crash simulations, to size cars. To cut back the total cost of a whole crash simulations, the aim of this thesis is to propose a or some Reduced-Order Model (ROM) methods that can be applied in a parametric space. The suggested methods in this thesis are nonintrusive and neither the solver nor the model should not be modified . The first tested method is the Proper Orthogonal Decomposition. This method allows reducing the behavior of a crash simulation and understanding the crash properties but not interpolating in a parametric space. The second method, ReCUR, is a variant of the classical decomposition CUR. It will be demonstrated as a general form of the non-intrusive methods. It allows overcoming two important limits of actual ROM methods : size of the model and the interpolation
Ventura, Jérôme. "Réduction de modèle en convection forcée par des méthodes d'identification." Phd thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2010. http://www.theses.fr/2010ESMA0013.
Повний текст джерелаMost engineering processes dealing with aerothermics involve numerical simulations (CFD) which need to take transient phenomena into account to be realistic. Low order models and responses surfaces offer the engineer an alternative to the high costs associated with CFD processes, providing him with surrogates for the outputs of his interest. This work is devoted to extend the Modal Identification Method (MIM) in the field of fluid dynamics. MIM is a low order modelling techniques, based on the minimization of the discrepancy between a usually large reference model, and a low order model. It solves an optimization problem whose variables are the low order model parameters. Low order models are built for several kinds of turbulent flows. The circular cylinder in a crossflow provides us with several test cases. We cope with steady flows or unsteady ones, be them in forced convection or isothermal cases. Those models are able to produce outputs as different as velocity and temperature fields, heat fluxes. . . The compressible flow around a wing profile is also considered to investigate the sampling effect. Those models give quick approximates of the pressure distribution or the force coefficients
Gstalter, Étienne. "Réduction d’ordre de modèle de crash automobile pour l’optimisation masse / prestations." Thesis, Compiègne, 2020. http://www.theses.fr/2020COMP2576.
Повний текст джерелаThis thesis is a part of a global research work dedicated to reduced-order modelling applications in the Renault engineering direction. It's research topic has been improved in the IRT System)('s project on Reduced Order Model and Multi-disciplinary Optimization. Some previous thesis can help understand the context. ([Vuong], [Charrier]). The main industrial application of the research theme is the focus on a body structure, in a crash loading. Some research works on acoustic, combustion and aerodynamic are currently ongoing. This thesis is both a contribution to the generic ReCUR method, and its application to a car body structure optimization for crash loadings. Engineering teams at Renault uses optimization to obtain the best crash simulation, with a numerical optimization software, based on designs of experiments. It requires a lot of crash simulation because each simulation is considered as unique, with only one response for each parameter. Only Inputs and Outputs are known. The ReCUR method consider that each simulation is a huge mine that needs our attention. We hope that we can decrease the number of crash simulation required to compute a model, by using much more data for each simulation
Pinto, Marinho Nuno. "Réduction d'un modèle de système électrique pour des études technico-économiques." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC051/document.
Повний текст джерелаThe simulation of complex processes in large scale power systems needs the reduction of the problem. How to reduce the spatial complexity of a large scale power network while minimizing information loss? To answer this question we have divided this work in three main steps: 1) network buses aggregation; 2) modelling of the clusters' links; 3) defining the equivalent branches maximum exchange capacity.The bus aggregations in a cluster implies that it will be treated as a coppper-plate by the market model. Therefore, the most frequent network congestions must be identified ideally placed at the clusters frontiers. After the reduction, the same power flow repartition must be found in both reduced and complete model. To do that, a methodology to define a PTDF matrix was developed. For economic purpose studies, the branches maximum capacity is a key parameter, to define this value, a methodology is proposed that estimates the equivalent transmission capacities using historical system operating set points.These approaches were applied to the European transmission network and allowed to define a reduced model that minimises the information loss
Oulefki, Abdelhakim. "Réduction de modèles thermiques par amalgame modal." Phd thesis, Ecole Nationale des Ponts et Chaussées, 1993. http://tel.archives-ouvertes.fr/tel-00523620.
Повний текст джерелаКниги з теми "Réduction de modèle (ROM)"
Bernier, Diane. La réduction du stress: Un modèle, une évaluation : rapport de recherche. [Montréal]: Université de Montréal, École de service social, 1988.
Знайти повний текст джерелаPredication and Simulation Methods for Geohazard Mitigation: Including CD-ROM. Abingdon: CRC Press [Imprint], 2009.
Знайти повний текст джерелаWeatherford, Larry R., C. P. Schmidt, Jeffrey H. Moore, and F. J. Gould. Introductory Management Science : Decision Modeling With Spreadsheets (with CD-ROM). Prentice Hall, 1998.
Знайти повний текст джерелаWeatherford, Larry R., C. P. Schmidt, Jeffrey H. Moore, and F. J. Gould. Introductory Management Science : Decision Modeling With Spreadsheets (with CD-ROM). 5th ed. Prentice Hall, 1998.
Знайти повний текст джерелаЧастини книг з теми "Réduction de modèle (ROM)"
CHIQUET, Julien, Marie-Josée CROS, Mahendra MARIADASSOU, Nathalie PEYRARD, and Stéphane ROBIN. "Le modèle Poisson log-normal pour l’analyse de distributions jointes d’abondance." In Approches statistiques pour les variables cachées en écologie, 175–99. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9047.ch8.
Повний текст джерелаDUBREUIL, Sylvain, Nathalie BARTOLI, Christian GOGU, and Thierry LEFEBVRE. "Réduction d’incertitudes en analyse multidisciplinaire basée sur une étude de sensibilité par chaos polynomial." In Ingénierie mécanique en contexte incertain, 121–50. ISTE Group, 2021. http://dx.doi.org/10.51926/iste.9010.ch4.
Повний текст джерелаFAILLE, Arnaud. "Faune souterraine et biogéographie." In La biogéographie, 159–80. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9060.ch6.
Повний текст джерелаЗвіти організацій з теми "Réduction de modèle (ROM)"
Dufour, Quentin, David Pontille, and Didier Torny. Contracter à l’heure de la publication en accès ouvert. Une analyse systématique des accords transformants. Ministère de l'enseignement supérieur et de la recherche, April 2021. http://dx.doi.org/10.52949/2.
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