Literatura científica selecionada sobre o tema "Problèmes paramétrés"
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Artigos de revistas sobre o assunto "Problèmes paramétrés"
Khoder, Wassim. "Recalage de la navigation inertielle hybride par le filtrage de Kalman sans parfum paramétré à quaternions". MATEC Web of Conferences 261 (2019): 06003. http://dx.doi.org/10.1051/matecconf/201926106003.
Texto completo da fonteAmbroise, B. "Génèse des débits dans les petits bassins versants ruraux en milieu tempéré : 2 - Modélisation systémique et dynamique". Revue des sciences de l'eau 12, n.º 1 (12 de abril de 2005): 125–53. http://dx.doi.org/10.7202/705346ar.
Texto completo da fonteChen, Sheng, Nan Li e Steven V. Sam. "Generalized Ehrhart polynomials". Discrete Mathematics & Theoretical Computer Science DMTCS Proceedings vol. AN,..., Proceedings (1 de janeiro de 2010). http://dx.doi.org/10.46298/dmtcs.2857.
Texto completo da fonteTeses / dissertações sobre o assunto "Problèmes paramétrés"
Sérée, Bastien. "Problèmes d'optimisation des les graphes paramétrés". Electronic Thesis or Diss., Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0066.
Texto completo da fonteWe are considering weighted oriented graphs with parametrized energy. Firstly we propose an algorithm that, given a graph and one of its vertices, returns trees, every tree representing shortest-paths from the source to every other vertex for a particular zone of the parameter space. Moreover, union of these zones is a covering of the parameter space. Then we consider reachability in graphs with multi-dimensional energy, with stricter constraints that enforce the energy to stay between bounds. We prove decidabilty and complexity of this problem regardless of the dimension and the number of parameters when parameters take integer values. We alsoprove the undecidability of this problem when there is at least one parameter and the dimension is at least two. Finally we study paritygames on parametrized graphs with one and two players whose objective is the conjunction of a qualitative condition on the parity andquantitative one : energy must stay positive. We show the decidability and prove bounds on the complexity of the problem of searchinga winning strategy in both cases with one and two players
Heyberger, Christophe. "PGD espace-temps adaptée pour le traitement de problèmes paramétrés". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2014. http://tel.archives-ouvertes.fr/tel-01048636.
Texto completo da fonteWurtzer, Floriane. "Une approche par modèles réduits pour la résolution de problèmes paramétrés multiphysiques fortement couplés". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST112.
Texto completo da fonteDuring design, optimization or predictive maintenance stages, engineers need to test various configurations of loading, geometry or material properties in order to build metamodels, perform sensitivity analyses or adjust uncertain parameters. Repeated calls to numerical models are then required to solve numerous related physical problems. However, such an approach can lead to prohibitive computational costs, especially in a multiphysics framework, which is a major focus of today's studies in cutting-edge industries. Indeed, each simulation involves millions of degrees of freedom, and must encompass several physics and their mutual interactions. In this context, this thesis proposes a computational strategy for efficiently solving many similar multiphysics problems. The developed approach is based on the combination of the LATIN-PGD solver and an initialization procedure that takes advantage of previously performed calculations to tackle a new set of parameters. More specifically, a reduced-order basis is built independently for each physics; each basis is then reused and enriched throughout the calculations when deemed necessary. The performances of the method are illustrated on a test case of representative size involving a strong thermo-mechanical coupling. A complete parametric study, involving around a hundred resolutions, is accelerated by a factor of 5 compared with a naive application of the LATIN-PGD method, and by a factor of 45 in comparison with a conventional monolithic approach
Daligault, Jean. "Techniques combinatoires pour les algorithmes paramétrés et les noyaux, avec applications aux problèmes de multicoupe". Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2011. http://tel.archives-ouvertes.fr/tel-00804206.
Texto completo da fonteBui, Dung. "Modèles d'ordre réduit pour les problèmes aux dérivées partielles paramétrés : approche couplée POD-ISAT et chainage temporel par algorithme pararéel". Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2014. http://www.theses.fr/2014ECAP0021/document.
Texto completo da fonteIn this thesis, an efficient Reduced Order Modeling (ROM) technique with control of accuracy for parameterized Finite Element solutions is proposed. The ROM methodology is usually necessary to drastically reduce the computational time and allow for tasks like parameter analysis, system performance assessment (aircraft, complex process, etc.). In this thesis, a ROM using Proper Orthogonal Decomposition (POD) will be used to build local models. The “model” will be considered as a database of simulation results store and retrieve the database is studied by extending the algorithm In Situ Adaptive Tabulation (ISAT) originally proposed by Pope (1997). Depending on the use and the accuracy requirements, the database is enriched in situ (i.e. online) by call of the fine (reference) model and construction of a local model with an accuracy region in the parameter space. Once the trust regions cover the whole parameter domain, the computational cost of a solution becomes inexpensive. The coupled POD-ISAT, here proposed, provides a promising effective ROM approach for parametric finite element model. POD is used for the low-order representation of the spatial fields and ISAT for the local representation of the solution in the design parameter space. This method is tested on a Engineering case of stationary air flow in an aircraft cabin. This is a coupled fluid-thermal problem depending on several design parameters (inflow temperature, inflow velocity, fuselage thermal conductivity, etc.). For evolution problems, we explore the use of time-parallel strategies, namely the parareal algorithm originally proposed by Lions, Maday and Turinici (2001). A quasi-Newton variant of the algorithm called Broyden-parareal algorithm is here proposed. It is applied to the computation of the gas diffusion in an aircraft cabin. This thesis is part of the project CSDL (Complex System Design Lab) funded by FUI (Fond Unique Interministériel) aimed at providing a software platform for multidisciplinary design of complex systems
Cochefert, Manfred. "Algorithmes exacts et exponentiels pour les problèmes NP-difficiles sur les graphes et hypergraphes". Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0336/document.
Texto completo da fonteIn this thesis, we are interested in the exact computation of np-hard problems on graphs and hypergraphs. Firstly, we study several variants of colorings. Those variants appear harder than the famous chromatic number problem, by adding difficulty in recognizing the color classes, or more often by introducing various relationships between them. Then we link to problems of transversals in hypergraphs. More precisely, we are interested in enumerating minimal transversals in bounded ranked hypergraphs. Besides the exact computation, we are also interested in fixed parameter tractability. For this area, we study two optimization versions of the famous square root of graphs problem. Finally, we will be interested in solving other problems of graphs related to colorings, or in order to compare efficiencies of algorithms depending on the memory space available. In this thesis, we will apply most of major techniques in designing exact exponential algorithms. The main techniques we use are dynamic programming, inclusion-exclusion, branching, or measure and conquer
Cochefert, Manfred. "Algorithmes exacts et exponentiels pour les problèmes NP-difficiles sur les graphes et hypergraphes". Electronic Thesis or Diss., Université de Lorraine, 2014. http://www.theses.fr/2014LORR0336.
Texto completo da fonteIn this thesis, we are interested in the exact computation of np-hard problems on graphs and hypergraphs. Firstly, we study several variants of colorings. Those variants appear harder than the famous chromatic number problem, by adding difficulty in recognizing the color classes, or more often by introducing various relationships between them. Then we link to problems of transversals in hypergraphs. More precisely, we are interested in enumerating minimal transversals in bounded ranked hypergraphs. Besides the exact computation, we are also interested in fixed parameter tractability. For this area, we study two optimization versions of the famous square root of graphs problem. Finally, we will be interested in solving other problems of graphs related to colorings, or in order to compare efficiencies of algorithms depending on the memory space available. In this thesis, we will apply most of major techniques in designing exact exponential algorithms. The main techniques we use are dynamic programming, inclusion-exclusion, branching, or measure and conquer
Fradin, Julien. "Graphes complexes en biologie : problèmes, algorithmes et évaluations". Thesis, Nantes, 2018. http://www.theses.fr/2018NANT4093/document.
Texto completo da fonteLn order to better understand how a biological system works, it is necessary to study the interactions between the different entities that compose it. To this aim, these biological interactions can be modelled in the form of graphs. ln some of these graphs, the vertices are colored in order to provide additional information on the entity which is associated with them. ln this context, a common subproblem consists in searching for a subgraph of interest, called a motif, in these graphs. ln the first part of this manuscript, we present a state of the art from an algorithmical point of view of the GRAPH MOTIF problem, which consists in searching for so-called functional motifs in vertex-colored graphs. The modeling of biological systems in graphs form can also be applied in mass spectrometry. Thus, we introduce the MAXIMUM COLORFUL ARBORESCENCE problem (MCA) in order to de novo determine the molecular formula of unknown metabolites. ln the second part of this manuscript, we carry out an algorithmic study of the MCA problem. While MCA is algorithmically difficult to solve even in very constrained graph classes, our modeling allows us to obtain new approximation algorithms in these same classes, as well as to determine a new graph class in which MCA is solved in polynomial time. Parameterized complexity results for this problem are also shown, which are then compared to those in the literature on instances from biological data
Chopin, Morgan. "Problèmes d'optimisation avec propagation dans les graphes : complexité paramétrée et approximation". Phd thesis, Université Paris Dauphine - Paris IX, 2013. http://tel.archives-ouvertes.fr/tel-00933769.
Texto completo da fonteDuvillié, Guillerme. "Approximation, complexité paramétrée et stratégies de résolution de problèmes d'affectation multidimensionnelle". Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT321/document.
Texto completo da fonteIn this thesis, we focused in the Wafer-to-Wafer integration problems. These problems come from IC manufacturing. During the production of three-dimensional processors, dies have to be superimposed. Until recent, the dies were engraved on a silicon disk called wafer, then were cut, tested and sorted to suppress faulty dies and lastly superimposed one to each other.However superimposing wafers instead of dies presents several technical and financial advantages. Since faulty dies can only be dismissed when cutting the wafer, superimpose two wafers can lead to superimpose a faulty die with a viable one. In this case, the resulting stack of dies is considered as faulty. It follows that a bad assignment between the wafers can lead to a disastrous yield.In order to minimize the number of faulty dies stacks, a "failure map" of each wafer is generated during a test phase. This map gives location of the faulty dies on the wafers. The objective is then to take advantage of this map to define an assignment of the wafers to each other in order to match as many failures as possible.This problem can be modelized with Multidimensional Assignment problems. Each wafer can be seen as a vector with as many dimensions as the number of dies engraved on it. A coordinate set to zero marks a faulty die while a coordinate set to one indicates a viable one. Each seat of wafers is represented by a set of vector. Formally, an instance of a Wafer-to-Wafer integration problem is represented by m sets of n p-dimensional vectors. The objective is then to partition the vectors into n disjoint m-tuples, each tuple containing exactly one vector per set. An m-tuple represents a stack of wafers. Every m-tuple can be represented by a p-dimensional vector. Each coordinate is computed by performing the bitwise AND between the corresponding coordinates of the vectors that compose the m-tuple. In other words, a coordinate of the representative vector is equal to one if and only if this coordinate is equal to one in every vector composing the tuple. It follows that a dies stack is viable if and only if all the dies composing the stack are viable. The objective is then to maximize the overall number of ones of to minimize the overall number of zeros.The first part of the thesis is a theoretical one. We study the complexity of the considered versions of the problem with regards to natural parameters such as m, n, p or the number of zeros per vector. We show that these problems can encode more classical problems such as Maximum Clique, Minimum Vertex Cover or k-Dimensional Matching. This leads to several negative results from computational complexity, approximability or even parameterized complexity point of view. We also provide several positive results for some specific cases of the problem.In a second part, we focus on the practical solving of the problem. We provide and compare several Integer Linear Programming formulations. We also focus on performances of some approximation algorithms that we detailed in the theoretical part
Livros sobre o assunto "Problèmes paramétrés"
Duflos, Emmanuel. Estimation prédiction: Éléments de cours et exercices résolus. Paris: Éditions Technip, 2000.
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