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Dissertations / Theses on the topic 'Spline robuste'

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Published: 4 June 2021
Last updated: 3 February 2022

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1

Tauber, Clovis Ayache Alain. "Filtrage anisotrope robuste et segmentation par B-Spline snake application aux images échographiques /." Toulouse : INP Toulouse, 2006. http://ethesis.inp-toulouse.fr/archive/00000035.

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2

Tauber, Clovis. "Filtrage anisotrope robuste et segmentation par B-spline snake : application aux images échographiques." Phd thesis, Toulouse, INPT, 2005. http://oatao.univ-toulouse.fr/7357/1/tauber1.pdf.

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Le contexte de ce travail est le traitement d'images échographiques. Plus précisément, on s'est intéressé au filtrage et à la segmentation automatique d'images dégradées par du speckle. La première partie concerne les travaux effectués sur le filtrage du speckle. Ils ont abouti à la conception d'une méthode de diffusion anisotrope robuste, nommée -diffusion. Elle se fonde sur un coefficient de diffusion original qui exploite lui-mˆeme la statistique du coefficient de variation et une adaptation de la fonction de Tukey. Un estimateur robuste du paramètre d'échelle de ce filtre est présenté. L'é
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3

Bureick, Johannes [Verfasser]. "Robuste Approximation von Laserscan-Profilen mit B-Spline-Kurven / Vorgelegt von Verm.-Ass. Johannes Bureick, M.Sc." München : Verlag der Bayerischen Akademie der Wissenschaften, 2020. http://d-nb.info/1218485647/34.

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4

Deshpande, Lalita Narhar. "Des algorithmes rapides pour la validation croisée sur des problèmes d'approximation non linéaires." Grenoble 1, 1990. http://tel.archives-ouvertes.fr/tel-00337860.

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5

Shen, Guoling 1967. "Approximation with interval B-splines for robust reverse engineering." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43456.

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6

Costa, Giulio. "Design and Optimisation Methods for Structures produced by means of Additive Layer Manufacturing processes." Thesis, Paris, ENSAM, 2018. http://www.theses.fr/2018ENAM0035/document.

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Le développement récent des technologies de fabrication additive par couches (Additive Layer Manufacturing) a généré de nouvelles opportunités en termes de conception. Généralement, une étape d'optimisation topologique est réalisée pour les structures ALM. Cette tâche est aujourd'hui facilitée par des progiciels commerciaux, comme Altair OptiStruct ou Simulia TOSCA. Néanmoins, la liberté accordée par l’ALM est seulement apparente et des problèmes majeurs empêchent une exploitation complète et généralisée de cette technologie.La première lacune importante provient de l'intégration directe du ré
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7

Ozmen, Ayse. "Robust Conic Quadratic Programming Applied To Quality Improvement -a Robustification Of Cmars." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612513/index.pdf.

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In this thesis, we study and use Conic Quadratic Programming (CQP) for purposes of operational research, especially, for quality improvement in manufacturing. In previous works, the importance and benefit of CQP in this area became already demonstrated. There, the complexity of the regression method Multivariate Adaptive Regression Spline (MARS), which especially means sensitivity with respect to noise in the data, became penalized in the form of so-called Tikhonov regularization, which became expressed and studied as a CQP problem. This was leading to the new method CMARS<br>it is more model-
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8

Abdel-Salam, Abdel-Salam Gomaa. "Profile Monitoring with Fixed and Random Effects using Nonparametric and Semiparametric Methods." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/29387.

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Profile monitoring is a relatively new approach in quality control best used where the process data follow a profile (or curve) at each time period. The essential idea for profile monitoring is to model the profile via some parametric, nonparametric, and semiparametric methods and then monitor the fitted profiles or the estimated random effects over time to determine if there have been changes in the profiles. The majority of previous studies in profile monitoring focused on the parametric modeling of either linear or nonlinear profiles, with both fixed and random effects, under the assumption
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9

Lin, Yao. "An Efficient Robust Concept Exploration Method and Sequential Exploratory Experimental Design." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4799.

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Experimentation and approximation are essential for efficiency and effectiveness in concurrent engineering analyses of large-scale complex systems. The approximation-based design strategy is not fully utilized in industrial applications in which designers have to deal with multi-disciplinary, multi-variable, multi-response, and multi-objective analysis using very complicated and expensive-to-run computer analysis codes or physical experiments. With current experimental design and metamodeling techniques, it is difficult for engineers to develop acceptable metamodels for irregular responses a
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10

Mora, Cofré Marco Ayache Alain. "Ensemble de niveaux robustes au speckle et recalage B-spline application à la segmentation et l'analyse du mouvement cardiaque par des images ultrasons /." Toulouse : INP Toulouse, 2008. http://ethesis.inp-toulouse.fr/archive/00000658.

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11

Mora, Cofré Marco. "Ensemble de niveaux robustes au speckle et recalage B-spline : application à la segmentation et l'analyse du mouvement cardiaque par des images ultrasons." Toulouse, INPT, 2008. http://ethesis.inp-toulouse.fr/archive/00000658/.

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L'analyse du mouvement local des parois du coeur dans des images ultrasonores est souvent utilisée pour diagnostiquer certaines malformations cardiaques. Malheureusement, cette modalité produit des images caractérisées par un niveau élevé de speckle, rendant difficile la détection des cavités. La thèse présente une méthode d'estimation du mouvement des cavités dans des images 2D. Nous proposons un nouveau modèle de level sets pour segmenter l'image. Ce modèle s'appuie sur une fonction d'arrêt adaptée au speckle. Celle-ci se démarque des fonctions habituelles en remplaçant le gradient par le co
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12

Tang, Xiongwen. "Two-level lognormal frailty model and competing risks model with missing cause of failure." Diss., University of Iowa, 2012. https://ir.uiowa.edu/etd/2997.

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In clustered survival data, unobservable cluster effects may exert powerful influences on the outcomes and thus induce correlation among subjects within the same cluster. The ordinary partial likelihood approach does not account for this dependence. Frailty models, as an extension to Cox regression, incorporate multiplicative random effects, called frailties, into the hazard model and have become a very popular way to account for the dependence within clusters. We particularly study the two-level nested lognormal frailty m
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13

Relvas, Carlos Eduardo Martins. "Modelos parcialmente lineares com erros simétricos autoregressivos de primeira ordem." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-28052013-182956/.

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Neste trabalho, apresentamos os modelos simétricos parcialmente lineares AR(1), que generalizam os modelos parcialmente lineares para a presença de erros autocorrelacionados seguindo uma estrutura de autocorrelação AR(1) e erros seguindo uma distribuição simétrica ao invés da distribuição normal. Dentre as distribuições simétricas, podemos considerar distribuições com caudas mais pesadas do que a normal, controlando a curtose e ponderando as observações aberrantes no processo de estimação. A estimação dos parâmetros do modelo é realizada por meio do critério de verossimilhança penalizada, que
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14

Willersjö, Nyfelt Emil. "Comparison of the 1st and 2nd order Lee–Carter methods with the robust Hyndman–Ullah method for fitting and forecasting mortality rates." Thesis, Mälardalens högskola, Akademin för utbildning, kultur och kommunikation, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-48383.

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The 1st and 2nd order Lee–Carter methods were compared with the Hyndman–Ullah method in regards to goodness of fit and forecasting ability of mortality rates. Swedish population data was used from the Human Mortality Database. The robust estimation property of the Hyndman–Ullah method was also tested with inclusion of the Spanish flu and a hypothetical scenario of the COVID-19 pandemic. After having presented the three methods and making several comparisons between the methods, it is concluded that the Hyndman–Ullah method is overall superior among the three methods with the implementation of
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15

Tan, Matthias H. Y. "Contributions to quality improvement methodologies and computer experiments." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/48936.

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This dissertation presents novel methodologies for five problem areas in modern quality improvement and computer experiments, i.e., selective assembly, robust design with computer experiments, multivariate quality control, model selection for split plot experiments, and construction of minimax designs. Selective assembly has traditionally been used to achieve tight specifications on the clearance of two mating parts. Chapter 1 proposes generalizations of the selective assembly method to assemblies with any number of components and any assembly response function, called generalized selecti
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16

Deshpande, Lalita-Narhar. "Des algorithmes rapides pour la validation croisée sur des problèmes d'approximation non linéaires." Phd thesis, 1990. http://tel.archives-ouvertes.fr/tel-00337860.

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17

Dhabale, Ashwin. "Impact Angle Constrained Guidance Using Cubic Splines." Thesis, 2015. http://etd.iisc.ernet.in/2005/3658.

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In this thesis the cubic spline guidance law and its variants are derived. A detailed analysis is carried out to find the initial conditions for successful interception. The results are applied to three dimensional guidance design and for solving waypoint following problems. The basic cubic spline guidance law is derived for intercepting a stationary target at a desired impact angle in a surface-to-surface engagement scenario. The guidance law is obtained using an inverse method, from a cubic spline curve based trajectory. For overcoming the drawbacks of the basic cubic spline guida
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18

Mora, Cofre Marco Antonio. "Ensembles de niveaux robustes au speckle et recalage B-spline: application à la segmentation et l'analyse du mouvement cardiaque par des images ultrasons." Phd thesis, 2008. http://oatao.univ-toulouse.fr/7718/1/mora_cofre.pdf.

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L'analyse du mouvement local des parois du cœur dans des images ultrasonores est souvent utilisée pour diagnostiquer certaines malformations cardiaques. Malheureusement, cette modalité produit des images caractérisées par un niveau élevé de speckle, rendant difficile la détection des cavités. La thèse présente une méthode d'estimation du mouvement des cavités dans des images 2D. Nous proposons un nouveau modèle de level sets pour segmenter l'image. Ce modèle s'appuie sur une fonction d'arrêt adaptée au speckle. Celle-ci se démarque des fonctions habituelles en remplaçant le gradient par le coe
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19

"Mixture-process Variable Design Experiments with Control and Noise Variables Within a Split-plot Structure." Doctoral diss., 2010. http://hdl.handle.net/2286/R.I.8772.

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abstract: In mixture-process variable experiments, it is common that the number of runs is greater than in mixture-only or process-variable experiments. These experiments have to estimate the parameters from the mixture components, process variables, and interactions of both variables. In some of these experiments there are variables that are hard to change or cannot be controlled under normal operating conditions. These situations often prohibit a complete randomization for the experimental runs due to practical and economical considerations. Furthermore, the process variables can be categori
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