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Academic literature on the topic 'Estimation multi-paramètres'
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Journal articles on the topic "Estimation multi-paramètres"
ROWIŃSKI, PAWEŁ M., and ADAM PIOTROWSKI. "Estimation of parameters of the transient storage model by means of multi-layer perceptron neural networks / Estimation des paramètres du modèle de transport TSM au moyen de réseaux de neurones perceptrons multi-couches." Hydrological Sciences Journal 53, no. 1 (February 2008): 165–78. http://dx.doi.org/10.1623/hysj.53.1.165.
Full textCao, Daling, Hongtao Li, Enguang Hou, Sulin Song, and Chengguang Lai. "Assessment and Hydrological Validation of Merged Near-Real-Time Satellite Precipitation Estimates Based on the Gauge-Free Triple Collocation Approach." Remote Sensing 14, no. 15 (August 8, 2022): 3835. http://dx.doi.org/10.3390/rs14153835.
Full textSiddo, Seyni, Nassim Moula, Issa Hamadou, Moumouni Issa, Hamani Marichatou, Nicolas Antoine-Moussiaux, Pascal Leroy, and Charles Michaux. "La croissance du bovin Azawak au Niger : influence de facteurs de variation non génétiques et estimation des paramètres génétiques." BASE, 2018, 84–93. http://dx.doi.org/10.25518/1780-4507.16442.
Full textDissertations / Theses on the topic "Estimation multi-paramètres"
Trottier, Nicolas. "Modélisation des écoulement en milieux poreux fracturés : estimation des paramètres par approche inverse multi-échelle." Phd thesis, Université de Strasbourg, 2014. http://tel.archives-ouvertes.fr/tel-01037933.
Full textGuyon, Frédéric. "Application des méthodes multi-grilles au contrôle optimal : méthodes de pondération en estimation de paramètres." Compiègne, 1991. http://www.theses.fr/1991COMPD431.
Full textNeumann, Maxim. "Télédétection de couverts végétaux par interférométrie SAR polarimétrique multi-bases : modélisation et estimation de paramètres physiques." Phd thesis, Université Rennes 1, 2009. http://tel.archives-ouvertes.fr/tel-00394049.
Full textcompte d'un milieu volumique situé au dessus d'un sol. Dans le cas de forêts observées en bande L, ce modèle tient compte de la topographie du sol, de la canopée, de la hauteur totale des arbres, de l'atténuation de l'onde, de la réflectivité au sein de la canopée, de
la morphologie des arbres prise en compte par la distribution statistique des orientations des branches et leur forme efficace, de la contribution du sol et enfin de l'interaction entre le sol et les troncs. Une méthodologie d'inversion des paramètres de végétation est développée dans le cas des acquisitions monopasse ou multipasses. Dans ce dernier cas, la méthode d'inversion tient compte de la décorrélation temporelle et permet ainsi une estimation pour chaque ligne de base. La performance de léstimation des paramètres de
végétation est évaluée à partir de données SAR simulées et réelles aéroportées en bande L, pour les deux cas de configurations en lignes de base simple ou multiple.
Molléro, Roch. "Personnalisation robuste de modèles 3D électromécaniques du cœur. Application à des bases de données cliniques hétérogènes et longitudinales." Thesis, Côte d'Azur, 2017. http://www.theses.fr/2017AZUR4106/document.
Full textPersonalised cardiac modeling consists in creating virtual 3D simulations of real clinical cases to help clinicians predict the behaviour of the heart, or better understand some pathologies from the estimated values of biophysical parameters. In this work we first motivate the need for a consistent parameter estimation framework, from a case study were uncertainty in myocardial fibre orientation leads to an uncertainty in estimated parameters which is extremely large compared to their physiological variability. To build a consistent approach to parameter estimation, we then tackle the computational complexity of 3D models. We introduce an original multiscale 0D/3D approach for cardiac models, based on a multiscale coupling to approximate outputs of a 3D model with a reduced "0D" version of the same model. Then we derive from this coupling an efficient multifidelity optimisation algorithm for the 3D model. In a second step, we build more than 140 personalised 3D simulations, in the context of two studies involving the longitudinal analysis of the cardiac function: on one hand the analysis of long-term evolution of cardiomyopathies under therapy, on the other hand the modeling of short-term cardiovascular changes during digestion. Finally we present an algorithm to automatically detect and select observable directions in the parameter space from a set of measurements, and compute consistent population-based priors probabilities in these directions, which can be used to constrain parameter estimation for cases where measurements are missing. This enables consistent parameter estimations in a large databases of 811 cases with the 0D model, and 137 cases of the 3D model
Roux, Clément. "Dimensionnement en fatigue multiaxiale des toiles de roues ferroviaires sous sollicitations multi-paramètres à amplitude variable." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX109/document.
Full textThe main objective of this PHD thesis is to develop a method for the definition of simplified equivalent loads representative of real loads (the severity is equivalent from fatigue phenomenon point of view). This method must be adapted to multi-input problems because loads applied on wheels are multi-dimensional (vertical and lateral loads) and independent. Finally, the thesis also aims to provide a comprehensive approach to fatigue-reliability problem of the wheels, which can be an extension of the stress-strength method for multi-input loads. A fatigue criterion for the railway will is presented and identified using a new test campaign
Rodiet, Christophe. "Mesure de Température par Méthodes Multi-Spectrales et Caractérisation Thermique de Matériaux Anisotropes par Transformations Intégrales : « Aspects Théoriques et Expérimentaux »." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0283/document.
Full textThis thesis consists of two relatively independent parts, the first part focuses on methods of temperature measurement using Multi-Spectral (passive optical pyrometry) methods, and the second on the Thermal Characterization by integral transforms at high temperature of orthotropic materials. In each of these two parts, methods / models developed were treated from a theoretical point of view, numerical and experimental. In the multi-spectral part, a method of temperature measurement to take into account a spectral variation of the overall measurement chain (including the emissivity) was introduced. Moreover, a method of determining the optimal wavelengths in the sense of minimizing the standard deviation of temperature, has been developed. Finally, it has also been shown that the optimal wavelengths for mono-spectral and bi-spectral measurements could be determined with similar laws to Wien's displacement law. In the Thermal Characterization part, different methods and models have been developed. The proposed methods perform the estimation of longitudinal and transverse diffusivities on all harmonics simultaneously. Furthermore, they allow overcoming the thermal coupling due to the presence of a sample holder, and / or making pseudo-local measurements of diffusivities. Finally, the concepts of correlation between parameters and duration of harmonics exploitability were also discussed.This thesis consists of two relatively independent parts, the first part focuses on methods of temperature measurement using Multi-Spectral (passive optical pyrometry) methods, and the second on the Thermal Characterization by integral transforms at high temperature of orthotropic materials. In each of these two parts, methods / models developed were treated from a theoretical point of view, numerical and experimental. In the multi-spectral part, a method of temperature measurement to take into account a spectral variation of the overall measurement chain (including the emissivity) was introduced. Moreover, a method of determining the optimal wavelengths in the sense of minimizing the standard deviation of temperature, has been developed. Finally, it has also been shown that the optimal wavelengths for mono-spectral and bi-spectral measurements could be determined with similar laws to Wien's displacement law. In the Thermal Characterization part, different methods and models have been developed. The proposed methods perform the estimation of longitudinal and transverse diffusivities on all harmonics simultaneously. Furthermore, they allow overcoming the thermal coupling due to the presence of a sample holder, and / or making pseudo-local measurements of diffusivities. Finally, the concepts of correlation between parameters and duration of harmonics exploitability were also discussed
Song, Yingying. "Amélioration de la résolution spatiale d’une image hyperspectrale par déconvolution et séparation-déconvolution conjointes." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0207/document.
Full textA hyperspectral image is a 3D data cube in which every pixel provides local spectral information about a scene of interest across a large number of contiguous bands. The observed images may suffer from degradation due to the measuring device, resulting in a convolution or blurring of the images. Hyperspectral image deconvolution (HID) consists in removing the blurring to improve the spatial resolution of images at best. A Tikhonov-like HID criterion with non-negativity constraint is considered here. This method considers separable spatial and spectral regularization terms whose strength are controlled by two regularization parameters. First part of this thesis proposes the maximum curvature criterion MCC and the minimum distance criterion MDC to automatically estimate these regularization parameters by formulating the deconvolution problem as a multi-objective optimization problem. The second part of this thesis proposes the sliding block regularized (SBR-LMS) algorithm for the online deconvolution of hypserspectral images as provided by whiskbroom and pushbroom scanning systems. The proposed algorithm accounts for the convolution kernel non-causality and including non-quadratic regularization terms while maintaining a linear complexity compatible with real-time processing in industrial applications. The third part of this thesis proposes joint unmixing-deconvolution methods based on the Tikhonov criterion in both offline and online contexts. The non-negativity constraint is added to improve their performances
Léger, Stéphanie. "Analyse stochastique de signaux multi-fractaux et estimations de paramètres." Orléans, 2000. http://www.theses.fr/2000ORLE2045.
Full textGomes, borges Marcos Eduardo. "Détermination et implémentation temps-réel de stratégies de gestion de capteurs pour le pistage multi-cibles." Thesis, Ecole centrale de Lille, 2018. http://www.theses.fr/2018ECLI0019/document.
Full textModern surveillance systems must coordinate their observation strategies to enhance the information obtained by their future measurements in order to accurately estimate the states of objects of interest (location, velocity, appearance, etc). Therefore, adaptive sensor management consists of determining sensor measurement strategies that exploit a priori information in order to determine current sensing actions. One of the most challenging applications of sensor management is the multi-object tracking, which refers to the problem of jointly estimating the number of objects and their states or trajectories from noisy sensor measurements. This thesis focuses on real-time sensor management strategies formulated in the POMDP framework to address the multi-object tracking problem within the LRFS approach. The first key contribution is the rigorous theoretical formulation of the mono-sensor LPHD filter with its Gaussian-mixture implementation. The second contribution is the extension of the mono-sensor LPHD filter for superpositional sensors, resulting in the theoretical formulation of the multi-sensor LPHD filter. The third contribution is the development of the Expected Risk Reduction (ERR) sensor management method based on the minimization of the Bayes risk and formulated in the POMDP and LRFS framework. Additionally, analyses and simulations of the existing sensor management approaches for multi-object tracking, such as Task-based, Information-theoretic, and Risk-based sensor management, are provided
Ouladsine, Mustapha. "Identification des systèmes dynamiques multi-variables." Nancy 1, 1993. http://docnum.univ-lorraine.fr/public/SCD_T_1993_0209_OULADSINE.pdf.
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