Academic literature on the topic 'Méthodes par décomposition'
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Journal articles on the topic "Méthodes par décomposition":
Doz, Catherine, Guillaume Rabault, and Nicolas Sobczak. "Décomposition tendance-cycle : estimations par des méthodes statistiques univariées." Économie & prévision 120, no. 4 (1995): 73–93. http://dx.doi.org/10.3406/ecop.1995.5746.
Heuveline, Patrick. "L'insoutenable incertitude du nombre : estimations des décès de la période Khmer rouge." Population Vol. 53, no. 6 (June 1, 1998): 1103–17. http://dx.doi.org/10.3917/popu.p1998.53n6.1117.
Djament, Aurélien. "Décomposition de Hodge pour l’homologie stable des groupes d’automorphismes des groupes libres." Compositio Mathematica 155, no. 9 (August 7, 2019): 1794–844. http://dx.doi.org/10.1112/s0010437x19007437.
Debellefontaine, H., P. Striolo, M. Chakchouk, J. N. Foussard, and J. Besombes-Vailhe. "Nouveaux procédés d'oxydation chimique pour l'élimination des rejets aqueux phénolés." Revue des sciences de l'eau 5, no. 4 (April 12, 2005): 555–72. http://dx.doi.org/10.7202/705147ar.
LEVALLOIS, PHILIPPE. "Calcul d'une fonction de Melnikov et de ses zeros pour une perturbation algebrique du billard elliptique." Ergodic Theory and Dynamical Systems 17, no. 2 (April 1997): 435–44. http://dx.doi.org/10.1017/s0143385797069836.
Ngamtiate, Amina Vanessa, and Didier Nganawara. "Comprendre le Changement Social de la Fécondité à Travers l’Autonomie des Femmes en Union au Cameroun : Apport des Méthodes de Décomposition." European Scientific Journal, ESJ 19, no. 35 (December 31, 2023): 78. http://dx.doi.org/10.19044/esj.2023.v19n35p78.
Livi Bacci, Massimo, and Gustavo De Santis. "La reproduction des populations : une méthode de décomposition et d'estimation." Population Vol. 52, no. 5 (May 1, 1997): 1119–42. http://dx.doi.org/10.3917/popu.p1997.52n5.1142.
Torre, André. "Allocation du crédit et changement structurel, l’exemple français (Une analyse verticalement intégrée de la période 1978-1986)." Économie appliquée 42, no. 2 (1989): 35–54. http://dx.doi.org/10.3406/ecoap.1989.2127.
Boumoula, Samir, and Nacira Boukhezer-Hammiche. "Contribution à la mesure de la pauvreté multidimensionnelle en Algérie : application de la méthode des sous-ensembles flous à la région de Bejaia." les cahiers du cread 39, no. 4 (March 30, 2024): 53–91. http://dx.doi.org/10.4314/cread.v39i4.3.
Bacci, M. Livi, and Gustavo De Santis. "Population reproduction. A method of breakdown and estimation (Population, 5,1997)." Population Vol. 53, HS2 (December 2, 1998): 245–66. http://dx.doi.org/10.3917/popu.p1998.10n2.0266.
Dissertations / Theses on the topic "Méthodes par décomposition":
Levy, Marie-Luce. "Méthodes par décomposition temporelle et problèmes d'ordonnancement." Toulouse, INPT, 1996. http://www.theses.fr/1996INPT012H.
Henri, Thibault. "Réduction de modèles par des méthodes de décomposition orthogonale propre." Rennes, INSA, 2004. http://www.theses.fr/2004ISAR0005.
Modelling complex systems leads one to solve problems of very high size numerically, for example in case of finite elements discretization. An alternative consists in using a priori known data to reduce the size of the system to solve. Given the solution u of an evolution problem, proper orthogonal decomposition (POD) methods allow one to define a basis of functions from a priori known snapshots u(ti) on which the problem is projected : one speaks of POD-Galerkin methods. This method has been especially implemented in case of fluids mechanics problems. We present a synthesis of POD methods. We show convergence results and estimates in the parabolic case and in the case of general equations in fluids mechanics. The stability of the method is proven. Numerical computations show that the size of systems to solve is very small compared to classical finite elements methods. We present an interesting application to compute the solution of optimal control problems
Arencibia, Noa Yunniel. "Méthodes rigoureuses par décomposition de domaines pour la diffusion électromagnétique par une surface rugueuse 2D." Thesis, Nantes, 2019. http://www.theses.fr/2019NANT4037.
The modeling of electromagnetic scattering by a (random) rough surface is a very active research subject. lt encounters many environmental applications such as natural soils or sea surface, or for the characterization of surface defects at the optical scale. The rigorous modeling of electromagnetic waves scattering by large abjects compared to the wavelength is a difficult task and can involve the resolution of a linear system of several millions of unknowns. Thus, the calculation of the electromagnetic field scattered by a twodimensional sea surface, has so far never been rigorously solved in the microwave frequency bands, and the cross polarization has not been reliably evaluated. This thesis aims to salve in part this problem by considering a randomly rough and perfectly conducting 2D surface with moderate dimensions. For this, we use the EFIE (Electric Field lntegral Equation) discretized by the method of moments using RWG (Rao-Wilton-Glisson) basis functions. In order to effectively salve the resulting linear system, we have chosen two domain decomposition methods, the SDIM (Subdomain Decomposition lterative Method) and the CBFM (Characteristic Basic Function Method). These methods, hybridized to the ACA (Adaptive Cross Approximation) to accelerate the coupling steps, make it possible to salve linear systems by blacks, with reduced CPU and memory complexities
Cherkaoui, Abdelhai. "Modélisation des séries temporelles par des méthodes de décomposition et applications." Aix-Marseille 3, 1987. http://www.theses.fr/1987AIX24011.
Our work has centered on the study of decomposition methods time series. This was done in four stages. First, we analyse classical methods of linear regression and of smoothing by moving averages. Secondly, we examine the decomposition method of an arima model. In the third stage, we present a method based on the recurrent algorithm of kalman. In the fourth stage, we illustrate our theoretical results and attempt to compare the box-jenkins method and the method of smoothing by moving average
Gest, Brigitte. "Résolution des grands systèmes linéaires par décomposition des domaines et méthodes rapides : comparaison avec d'autres méthodes." Paris 11, 1985. http://www.theses.fr/1985PA112395.
This work is dedicated to the evaluation of the efficiency of the resolution of some large sparse linear systems using Fast Direct Methods. Although they are based on the use of the same FFT algorithm, they can be divided in three categories: the Fourier analysis, the Cyclic Reduction by blocks and their combination, the F. A. C. R (l). The comparison with classic methods was conducted in configurations requiring the regularity of the domain. Very promising results being obtained, techniques allowing to work in more general domains have then been implemented: the capacitance matrix technique and the combination of the iterative methods with fast methods. The fineness of part of the grid applied to the domain was also investigated. The semi-direct method was selected as reference algorithm for the last comparative numerical tests because it is specially adapted to the structure of the domain under test
Hohweiller, Tom. "Méthodes de décomposition non-linéaire pour l'imagerie X spectrale." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI097.
Spectral tomodensitometry is a new emerging x-ray imaging modality. If the dual-energy principle was already known for quite some time, new developments on photon-counting detectors now allowing acquiring more energy bins than before. This modality allows reducing some artifacts presents in x-ray imaging, such as beam hardening, but mostly to decompose the data into the chemical composition of the imaged tissue. It also enables the use of new markers (i.e. gold) with an energic discontinuity. The use of these markers also allows to locate and quantify them in the patient, granting great potential for medical imaging. Decomposition in the projection domain followed by a tomographic reconstruction is a classical processing for those spectral data. However, decomposition methods in the projection domain are unstable for a high number of energy bins. Classical calibration technic is numerically unstable for more than two energy bins. This thesis aims to developed new material decomposition methods in the projections domains. After expressing the spectral forward model, the decomposition problem is expressed and dealt as a non-linear inverse problem. It will be solved by minimizing a cost function composed by a term characterizing the fidelity of the decomposition regarding the data and an \textit{a priori} of the decomposed material maps. We will firstly present an adaptation of the cost function that takes into account the Poissonian noise on the data. This formulation allows having better decomposed maps for a high level of noise than classical formulation. Then, two constrained algorithms will be presented. The first one, a projected Gauss-Newton algorithm, that enforces positivity on the decomposed maps, allows having better decomposed maps than an unconstrained algorithm. To improve the first algorithm, another one was developed that also used an egality constrain. The equality allows having images with fewer artifacts than before. These methods are tested on a numerical phantom of a mouse and thorax. To speed up the decomposition process, an automatic choice of parameters is presented, which allow faster decomposition while keeping good maps. Finally, the methods are tested on experimental data that are coming from a spectral scanner prototype
Fontaine, Mathieu. "Apport de la décomposition arborescente pour les méthodes de type VNS." Phd thesis, Université de Caen, 2013. http://tel.archives-ouvertes.fr/tel-01025435.
Samaké, Abdoulaye. "Méthodes non-conformes de décomposition de domaine à grande échelle." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENM066/document.
This thesis investigates domain decomposition methods, commonly classified as either overlapping Schwarz methods or iterative substructuring methods relying on nonoverlapping subdomains. We mainly focus on the mortar finite element method, a nonconforming approach of substructuring method involving weak continuity constraints on the approximation space. We introduce a finiteelement framework for the design and the analysis of the substructuring preconditioners for an efficient solution of the linear system arising from such a discretization method. Particular consideration is given to the construction of the coarse grid preconditioner, specifically the main variantproposed in this work, using a Discontinuous Galerkin interior penalty method as coarse problem. Other domain decomposition methods, such as Schwarz methods and the so-called three-field method are surveyed with the purpose of establishing a generic teaching and research programming environment for a wide range of these methods. We develop an advanced computational framework dedicated to the parallel implementation of numerical methods and preconditioners introduced in this thesis. The efficiency and the scalability of the preconditioners, and the performance of parallel algorithms are illustrated by numerical experiments performed on large scale parallel architectures
Aussal, Matthieu. "Méthodes numériques pour la spatialisation sonore, de la simulation à la synthèse binaurale." Palaiseau, Ecole polytechnique, 2014. https://tel.archives-ouvertes.fr/tel-01095801/document.
Research conducted during this PhD were initiated by an industrial need identified by Digital Media Solutions, namely the creation of a tool for spatial sound rendering on headphones for blind people. Despite the many existing devices, technical 3D sound on headphones face since their appearance the major obstacle that prevents the achievement of high quality products. Indeed, to make the illusion of a perceptible sound space, it is necessary to individualize listening to each listener. Measurements in the laboratory provide with convincing results, but the process is not yet applicable to the public. Mathematical modeling of this experiment allows to consider replacing the measure by a numerical simulation. This thesis proposes both an efficient calculation engine adapted to the problem, and a 3D audio rendering engine in order to validate the approach
Sun, Xiao Chao. "Résolution de la programmation linéaire en nombres entiers : méthodes des coupes, méthodes de séparation et évaluation et méthodes de décomposition de programmes par matrices d'intervalles et par matrices graphiques." Clermont-Ferrand 2, 1993. http://www.theses.fr/1993CLF21451.
Book chapters on the topic "Méthodes par décomposition":
Danaila, Ionut, Pascal Joly, Sidi Mahmoud Kaber, and Marie Postel. "Projet 8. Décomposition de domaines par la méthode de Schwarz." In Introduction au calcul scientifique par la pratique, 166–90. Dunod, 2005. http://dx.doi.org/10.3917/dunod.danai.2005.01.0166.
Conference papers on the topic "Méthodes par décomposition":
ADNAOUI, Khalid, Nourdine TOUNSI, Mohamed CHAGDALI, and Soumia MORDANE. "Méthode de décomposition du domaine pour la modélisation numérique d’un jet par la méthode particule-maillage." In Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 2014. http://dx.doi.org/10.5150/jngcgc.2014.002.