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Статті в журналах з теми "Agrégation de modèles":
Diouf, Abdoulaye, Nicolas Barbier, Ali Mahamane, Jean Lejoly, Mahamane Saadou, and Jan Bogaert. "Caractérisation de la structure spatiale des individus ligneux dans une « brousse tachetée » au sud-ouest du Niger." Canadian Journal of Forest Research 40, no. 4 (April 2010): 827–35. http://dx.doi.org/10.1139/x10-031.
Dagum, Camilo. "Répartition personnelle et fonctionnelle des revenus: une approche intégrée." Études internationales 29, no. 2 (April 12, 2005): 239–65. http://dx.doi.org/10.7202/703876ar.
Marina, Yefimova, Celia Ravel, Neyroud Anne-Sophie, Emile Béré, and Nicolas Bourmeyster. "Les myélinosomes : une nouvelle voie du contrôle de qualité des protéines." médecine/sciences 36, no. 11 (November 2020): 1012–17. http://dx.doi.org/10.1051/medsci/2020173.
Didry, Claude. "La production juridique de la convention collective: La loi du 4 mars 1919." Annales. Histoire, Sciences Sociales 56, no. 6 (December 2001): 1253–82. http://dx.doi.org/10.1017/s0395264900033977.
De Almeida, David. "Agrégation des données pour l'évaluation des performances de systèmes flexibles de production par modèles à réseaux de files d'attente." RAIRO - Operations Research 32, no. 2 (1998): 145–92. http://dx.doi.org/10.1051/ro/1998320201451.
Morris, John N., Iain Carpenter, Katherine Berg, and Richard N. Jones. "Outcome Measures for Use with Home Care Clients." Canadian Journal on Aging / La Revue canadienne du vieillissement 19, S2 (2000): 87–105. http://dx.doi.org/10.1017/s071498080001391x.
Laurent, Marie-Alexandre, and Isabelle Thomas. "Modèle d'interaction spatiale et agrégation des lieux [L'exemple des données criminelles]." Espace géographique 26, no. 3 (1997): 269–79. http://dx.doi.org/10.3406/spgeo.1997.1082.
Artus, Patrick, and Eric Bleuze. "Les choix de portefeuille des ménages en France." Recherches économiques de Louvain 55, no. 2 (1989): 129–53. http://dx.doi.org/10.1017/s0770451800029596.
VEISSIER, I., R. BOTREAU, and P. PERNY. "Évaluation multicritère appliquée au bien-être des animaux en ferme ou à l’abattoir : difficultés et solutions du projet Welfare Quality®." INRAE Productions Animales 23, no. 3 (September 14, 2010): 269–84. http://dx.doi.org/10.20870/productions-animales.2010.23.3.3308.
Cazes, Sandrine, Thierry Chauveau, Jacques Le, and Rahim Loufir. "Retraites et évolutions démographiques en France. Première partie : Le long terme." Revue de l'OFCE 39, no. 1 (January 1, 1992): 93–149. http://dx.doi.org/10.3917/reof.p1992.39n1.0093.
Дисертації з теми "Agrégation de modèles":
Trifi, Amine. "Essais en agrégation, convergence et limites en temps continu des modèles GARCH." Paris 1, 2007. http://www.theses.fr/2007PA010057.
Melquiond, Adrien. "Agrégation de peptides amyloïdes par des simulations numériques." Paris 7, 2007. http://www.theses.fr/2007PA077053.
More than twenty human diseases, including Alzheimer's disease and dialysis-related amyloidosis, are associated with the pathological self-assembly of soluble proteins into transient cytotoxic oligomers and amyloid fibrils. Because this process is very complex, the detailed aggregation paths and structural characterization of the intermediate species remain to be determined. In this work, we first review our current understanding of the dynamics and free energy surface of the assembly of small amyloid-forming peptides (KFFE and the fragment 22-27 of amylin) using the OPEP coarse-grained protein force field (Optimized Potential for Efficient peptide-structure Prediction) coupled to the activation-relaxation technique (ART) and molecular dynamics (MD). Next, we present replica exchange MD simulations (REMD) on the dimers of Alzheimer's peptides Abeta (1-40) and Abeta (1-42) and discuss the rôle of amino acids 23-28 in fibril formation. Finally, we probe the first steps of Abeta (16-22) oligomer dissociation in the presence of N-methylated inhibitors by MD-OPEP simulations
Chebaro, Yassmine. "Agrégation des peptides et protéines amyloïdes par simulations numériques." Paris 7, 2010. http://www.theses.fr/2010PA077120.
The aggregation of amyloid peptides and proteins is the hallmark of neurodegenerative disease. In this thesis, we were interested in the Alzheimer disease and the prion related diseases. The two proteins implicated in those pathologies are the Abeta peptides and the prion protein respectively. The self-assembly of these soluble proteins into toxix oligomers is difficult to caracterize using the actual experimental techniques and the formation of amyloid fibrils is a very slow process in vitro and in vivo. The use of in silico simulation methods is therefore a useful tool to a better understanding of the pathological assembly. In this work, we used the coarse-grained force field (OPEP) based on a reduced representation of the amino-acids, allowing the acccess to longer simulation times in order to identify the structural modifications associated with the amyloid assembly. First, we review the coarse-grained model and the energy function associated to it, followed by its validation on numerous Systems. Then, we present the results of OPEP on the identification of the structural and thermodynamical properties of the amyloid peptide Abeta(16-35), the study of the inhibition mechanism on a preformed fibril in the presence of N-methylated inhibitors, and finally the study of de novo synthesized model peptides of the amyloid aggregation. The last part of the work concerns the study of the prion protein and the effect of the T183A mutation, causing Creutzfeld-Jacob disease, on its structure and stability, in the monomeric and dimeric forms of the protein, as well as the aggregation properties of the Hl helix of the prion protein in its monomeric, dimeric and tetrameric states
Bourel, Mathias. "Agrégation de modèles en apprentissage statistique pour l'estimation de la densité et la classification multiclasse." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4076/document.
Ensemble methods in statistical learning combine several base learners built from the same data set in order to obtain a more stable predictor with better performance. Such methods have been extensively studied in the supervised context for regression and classification. In this work we consider the extension of these approaches to density estimation. We suggest several new algorithms in the same spirit as bagging and boosting. We show the efficiency of combined density estimators by extensive simulations. We give also the theoretical results for one of our algorithms (Random Averaged Shifted Histogram) by mean of asymptotical convergence under milmd conditions. A second part is devoted to the extensions of the Boosting algorithms for the multiclass case. We propose a new algorithm (Adaboost.BG) accounting for the margin of the base classifiers and show its efficiency by simulations and comparing it to the most used methods in this context on several datasets from the machine learning benchmark. Partial theoretical results are given for our algorithm, such as the exponential decrease of the learning set misclassification error to zero
Ghattas, Badih. "Agrégation d'arbres de décision binaires : Application à la prévision de l'ozone dans les Bouches du Rhône." Aix-Marseille 2, 2000. http://www.theses.fr/2000AIX22003.
Moulahi, Bilel. "Définition et évaluation de modèles d'agrégation pour l'estimation de la pertinence multidimensionnelle en recherche d'information." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30254/document.
The main research topic of this document revolve around the information retrieval (IR) field. Traditional IR models rank documents by computing single scores separately with respect to one single objective criterion. Recently, an increasing number of IR studies has triggered a resurgence of interest in redefining the algorithmic estimation of relevance, which implies a shift from topical to multidimensional relevance assessment. In our work, we specifically address the multidimensional relevance assessment and evaluation problems. To tackle this challenge, state-of-the-art approaches are often based on linear combination mechanisms. However, these methods rely on the unrealistic additivity hypothesis and independence of the relevance dimensions, which makes it unsuitable in many real situations where criteria are correlated. Other techniques from the machine learning area have also been proposed. The latter learn a model from example inputs and generalize it to combine the different criteria. Nonetheless, these methods tend to offer only limited insight on how to consider the importance and the interaction between the criteria. In addition to the parameters sensitivity used within these algorithms, it is quite difficult to understand why a criteria is more preferred over another one. To address this problem, we proposed a model based on a multi-criteria aggregation operator that is able to overcome the problem of additivity. Our model is based on a fuzzy measure that offer semantic interpretations of the correlations and interactions between the criteria. We have adapted this model to the multidimensional relevance estimation in two scenarii: (i) a tweet search task and (ii) two personalized IR settings. The second line of research focuses on the integration of the temporal factor in the aggregation process, in order to consider the changes of document collections over time. To do so, we have proposed a time-aware IR model for combining the temporal relavance criterion with the topical relevance one. Then, we performed a time series analysis to identify the temporal query nature, and we proposed an evaluation framework within a time-aware IR setting
Thill, Antoine. "Agrégation des particules : structure, dynamique et simulation : application au cas d'un écoulement stratifié : l'estuaire du Rhône." Phd thesis, Aix-Marseille 3, 1999. http://tel.archives-ouvertes.fr/tel-00109390.
En effet, afin de mener à bien cette étude, il a fallu développer de façon préliminaire différents outils. On a ainsi mis au point deux nouvelles méthodes de mesure expérimentale de la structure des agrégats qui échappent aux techniques existantes. Ces méthodes permettent, outre une meilleure connaissance du système, de développer et de valider un nouveau modèle de la cinétique de croissance des agrégats. Ce modèle numérique prend en compte la dimension fractale des agrégats ainsi que sa variabilité. Il est validé par confrontation à des données issues de la bibliographie et l'expériences.
Une étude de terrain dans l'estuaire du grand Rhône est menée dans des conditions hydrodynamiques contrastées (étiage, débit moyen et crue). Elle a permis d'obtenir, pour la première fois, une série de mesures de tailles de particules tout au long de la zone de mélange. Il est établi que les particules les plus grosses (supérieures à 5 microns) présentent une évolution contrôlée par la dilution, la sédimentation et
éventuellement la remise en suspension. Par contre, les particules plus petites (2 à 5 microns) montrent une augmentation de leur concentration le long de la zone de mélange. Dans les premiers temps du mélange, cette augmentation est liée à la fragmentation d'agrégats. Il est possible de montrer ensuite i) que l'agrégation des colloïdes ne peut expliquer cette augmentation que si ceux ci ne réagissent pas avec les fractions de tailles supérieures et présentent une réactivité très supérieure à la réactivité moyenne (alpha : 0.009) et ii) que la production primaire est un mécanisme probable pour expliquer cette augmentation.
Hozé, Nathanaël. "Modélisation et méthodes d'analyse de la diffusion et agrégation au niveau moléculaire pour l'organisation sous-cellulaire." Paris 6, 2013. http://www.theses.fr/2013PA066695.
In the present PhD thesis, we study diffusion and aggregation in the context of cellular biology. Our goal is to obtain physical laws of several processes such as particle assembly or laws of diffusion in microdomains, in order to determine how subcellular processes are constructed from elementary molecular organization. This change of scale can be formulated and analyzed using several tools such as partial differential equations, statistical physics, stochastic processes and numerical simulations. We present here several methods and we apply them to study questions in biophysics, neurobiology and cellular biology. Examples are receptors trafficking on cellular membrane, nuclear organization and the dynamics of viral assembly. In the first part, to obtain an estimation of the effective diffusion coefficient of a Brownian particle moving in between obstacles, we compute the mean time for a Brownian particle to arrive to a narrow opening defined as the region of minimal distance between two disks of identical radius. The method relies on M\"obius conformal transformation applied to the Laplace equation. Using this result, we develop statistical methods to solve a reverse engineering problem which consists in recovering parameters of a stochastic equation from a large number of short trajectories. Applying this method to superresolution data of receptor trafficking, we identify novel molecular organization, which are described as potential wells (deterministic part of the SDE). We next solve a different question: how is it possible to reconstruct surfaces from a large sample of short stochastic trajectories? By using Ito's formula, we derive a new class of nonlinear partial differential equations that allow us to reconstruct the surface. This section is illustrated with numerical examples. In the second part, we focus on an aspect of nuclear organization and our goal is to model and analyze telomere dynamics (ends of the chromosomes) in the cell nucleus. Early experimental findings reveal that yeast telomeres organize dynamically in a small numbers of clusters, yet this process remains poorly understood. Thus, we use a statistical physics approach to study the joint dynamics of the 32 telomeres, that we model as independent Brownian particles that can also form aggregates. We estimate the number of clusters and the number of telomeres per cluster using exact formula that we derive from our model. We identify the relevant parameters by comparing our results with experimental data. In particular, we show that a single parameter - the ratio of the association to the dissociation rate - is sufficient to account for telomere clustering in various conditions. Finally, we develop an empirical model to study particle aggregation to a single nucleation site. The distribution of particles in small clusters before arriving is a key ingredient to derive kinetic laws. We derive these laws using first a deterministic model and then a stochastic jump process, which allows us to obtain also an explicit expression for the mean time that the nucleation site is filled. We discuss some applications to HIV capsid formation
Coppin, David. "Agrégation de la convection dans un modèle de circulation générale : mécanismes physiques et rôle climatique." Electronic Thesis or Diss., Paris 6, 2017. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2017PA066057.pdf.
This thesis focuses on the study of convective aggregation in LMDZ5A general circulation model, used in Radiative-Convective Equilibrium (RCE) configuration. The instability of the RCE allows us to look at the mechanisms controlling the initiation of convective aggregation and its dependence on sea surface temperatures (SST). At low SSTs, a coupling between the large-scale circulation and the radiative effects of low clouds is needed to trigger self-aggregation. At high SSTs, the coupling between the large-scale circulation and the surface fluxes controls this initiation. When the atmosphere is coupled to a slab ocean mixed layer, SST gradients facilitate the initiation of convective aggregation. Except for the high-cloud radiative effects, triggering mechanisms are less crucial. Convection also becomes less dependent on the SST.The impact of convective aggregation on the climate sensitivity and surface temperature is also analyzed. Convective aggregation is found to increase the area of dry clear-sky zones. Thus, it tends to cool the system very efficiently. However, the negative feedback associated with an increase in aggregation is generally balanced by offsetting changes in SST gradients and low clouds that tend to increase the climate sensitivity. In contrast, at shorter timescales, the coupling between ocean and convective aggregation also controls the strength of convective aggregation and overturn its effect. Thus the impact of convective aggregation may not be as strong as what can be inferred from experiments with uniform SSTs.These results emphasize the importance of considering ocean-atmosphere coupling when studying the role of aggregation in climate
Bel, Liliane. "Sur la réduction des modèles linéaires : analyse de données en automatique." Paris 11, 1985. http://www.theses.fr/1985PA112306.
Two state space model reduction methods are studied: aggregation method and the balanced state space representation method. In the case of aggregation a new method of selecting eigenvalues is proposed, which is both geometrical and sequential. Problems of robustness of aggregation are evoked and resolved in some particular cases. The balanced state space representation is approached by means of contralibility and observability degrees. The notion of perturbability degree is introduced. Then we study the application of those two methods to reduced order compensator design. The two methods are finally applied to the system representing the launch booster Ariane flying
Книги з теми "Agrégation de modèles":
Boussard, Jean-Marc. La programmation linéaire dans les modèles de production. Paris: Masson, 1988.
Частини книг з теми "Agrégation de modèles":
Chafaï, Djalil, and Florent Malrieu. "Agrégation limitée par diffusion interne." In Recueil de Modèles Aléatoires, 83–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49768-5_6.