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Dissertations / Theses on the topic 'Algoritmus Levenberg-Marquardt'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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1

Tománek, Daniel. "Zvýšení přesnosti a robustnosti bezdrátových lokalizačních technik." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221140.

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The main theme of this thesis are problems of locating of wireless units in localization systems represented by wireless sensor networks. The thesis describes principle of trilateration and Levenberg-Marquardt algorithm. The main theme of this thesis is simulation of behavior of localisation systems and possible optimization of localization.

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2

Zapletal, Marek. "Implementace a testování vybraných optimalizačních metod pro úlohy odhadu parametrů simulačních modelů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254426.

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This thesis deals with design of appropriate optimization algorithms for purposes of newly developed tool Mechlab’s parameter estimation, which serves for parameter estimation of simulation models in Matlab/Simulink. Levenberg-Marquardt algorithm had been chosen among other gradient methods. On the other hand, genetic algorithm and simulated annealing had been chosen from category of soft computing techniques to be implemented. Chosen algorithms were tested on artifical problem of mechanical oscilator and also on real datasets from electronic throttle. Proposed simulated annealing worked in bo

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3

Samek, Martin. "Adaptivní optimální regulátory s principy umělé inteligence v prostředí MATLAB - B&R." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218211.

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Master’s thesis describes adaptive optimal controller design and it’s settings. Identification with principles of artificial intelligence and recursive least squares identification with exponential and directional forgetting are compared separately and as part of controller. Adaptive optimal controller is tested on physical model and compared with solidly adjusted PSD controller. Possibilities of implementation of adaptive optimal controller into programmable logic controller B&R are show and tested.

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4

Shukla, Pradyumn Kumar. "Levenberg-Marquardt Algorithms for Nonlinear Equations, Multi-objective Optimization, and Complementarity Problems." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-27372.

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The Levenberg-Marquardt algorithm is a classical method for solving nonlinear systems of equations that can come from various applications in engineering and economics. Recently, Levenberg-Marquardt methods turned out to be a valuable principle for obtaining fast convergence to a solution of the nonlinear system if the classical nonsingularity assumption is replaced by a weaker error bound condition. In this way also problems with nonisolated solutions can be treated successfully. Such problems increasingly arise in engineering applications and in mathematical programming. In this thesis we us

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5

Kostka, Filip. "Umělá neuronová síť pro modelování polí uvnitř automobilu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220578.

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The project deals with artificial neural networks. After designing and debugging the test data set and the training sample set, we created a multilayer perceptron network in the Neural NetworkToolbox (NNT) of Matlab. When creating networks, we used different training algorithms and algorithms improving the generalization of the network. When creating a radial basis network, we did not use the NNT, but a specific source code in Matlab was written. Functionality of neural networks was tested on simple training and testing patterns. Realistic training data were obtained by the simulation of twelv

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6

Shukla, Pradyumn K. [Verfasser]. "Levenberg-Marquardt Algorithms for Nonlinear Equations, Multi-objective Optimization, and Complementarity Problems / Pradyumn K Shukla." Aachen : Shaker, 2010. http://d-nb.info/1122546505/34.

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7

Ferreira, Ana Paula Carvalho da Silva. "Identificação do funcional da resposta aeroelástica via redes neurais artificiais." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-04022016-095107/.

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Identificação e predição do comportamento aeroelástico representa um grande desafio para a análise e controle de fenômenos aeroelásticos adversos. A modelagem aeroelástica requer informações tanto sobre a dinâmica estrutural quanto sobre o comportamento aerodinâmico não estacionário. No entanto, a maioria das metodologias disponíveis atualmente são baseadas no desacoplamento entre o modelo estrutural e o modelo aerodinâmico não estacionário. Conseqüentemente, métodos alternativos são bem vindos na área de pesquisa aerolástica. Entre os métodos alternativos está o funcional multicamada, que for

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8

Allen, Andy. "Analytic element modeling of the High Plains Aquifer: non-linear model optimization using Levenberg-Marquardt and particle swarm algorithms." Thesis, Kansas State University, 2012. http://hdl.handle.net/2097/14103.

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Master of Science<br>Department of Civil Engineering<br>David R. Steward<br>Accurate modeling of the High Plains Aquifer depends on the availability of good data that represents and quantities properties and processes occurring within the aquifer. Thanks to many previous studies there is a wealth of good data available for the High Plains Aquifer but one key component, groundwater-surface water interaction locations and rates, is generally missing. Without these values accurate modeling of the High Plains Aquifer is very difficult to achieve. This thesis presents methods for simplifying the m

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9

Lecouvé, Marc. "Conception et réalisations de filtres microondes à modes évanescents à l'aide d'un algorithme génétique : Egalisation d'amplitude par l'algorithme de levenberg-Marquardt." Bordeaux 1, 2000. http://www.theses.fr/2000BOR12211.

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Les filtres constituent un élément essentiel des systèmes de télécommunications par satellite. Filtres à guides et cavités sont le plus souvent utilisés en raison des faibles pertes requises. Ce mémoire porte essentiellement sur des filtres passe-bande utilisant des tronçons de guides rectangulaires propagatifs et évanescents. L'objectif est d'étudier les performances de filtres rectilignes ou recourbés à bande large ou étroite en bande X et Ku. Le chapitre 1 présente les fondements électromagnétiques et la modélisation, de tronçons de guide chargé par des inserts. Un raccordement modal permet

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10

Abbas, Boushra. "Méthode de Newton régularisée pour les inclusions monotones structurées : étude des dynamiques et algorithmes associés." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS250/document.

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Cette thèse est consacrée à la recherche des zéros d'un opérateur maximal monotone structuré, à l'aide de systèmes dynamiques dissipatifs continus et discrets. Les solutions sont obtenues comme limites des trajectoires lorsque le temps t tend vers l'infini. On s'intéressera principalement aux dynamiques obtenues par régularisation de type Levenberg-Marquardt de la méthode de Newton. On décrira aussi les approches basées sur des dynamiques voisines.Dans un cadre Hilbertien, on s'intéresse à la recherche des zéros de l'opérateur maximal monotone structuré M = A + B, où A est un opérateur maximal

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11

Morad, Farhad. "Non-linear Curve Fitting." Thesis, Mälardalens högskola, Akademin för utbildning, kultur och kommunikation, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-43600.

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The work done in this thesis is to examine various methods for curve fitting. Linear least squares and non-linear least squares will be described and compared, and the Newton method, Gauss--Newton method and Levenberg--Marquardt method will be applied to example problems.<br>Syftet med denna uppsats är att beskriva och använda olika metoder för kurvanpassning, det vill säga att passa matematiska funktioner till data. De metoder som undersöks är Newtons metod, Gauss--Newton metoden och Levenberg--Marquardt metoden. Även skillnaden mellan linjär minsta kvadrat anpassning och olinjär minsta kvadr

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12

Silva, Luciano Gonçalves da. "Problemas inversos em processos difusivos com retenção." Universidade do Estado do Rio de Janeiro, 2013. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=4799.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Um Estudo para a solução numérica do modelo de difusão com retenção, proposta por Bevilacqua et al. (2011), é apresentado, bem como uma formulação implícita para o problema inverso para a estimativa dos parâmetros envolvidos na formulação matemática do modelo. Através de um estudo minucioso da análise de sensibilidade e do cálculo do coeficiente de correlação de Pearson, são identificadas as chances de se obter sucesso na solução do problema inverso através do método determinístico de Levenberg-Marquardt e dos métodos estocásticos

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13

Clausner, André. "Möglichkeiten zur Steuerung von Trust-Region Verfahren im Rahmen der Parameteridentifikation." Thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-114847.

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Zur Simulation technischer Prozesse ist eine hinreichend genaue Beschreibung des Materialverhaltens notwendig. Die hierfür häufig verwendeten phänomenologischen Ansätze, wie im vorliegenden Fall die HILLsche Fließbedingung, enthalten materialspezifische Parameter, welche nicht direkt messbar sind. Die Identifikation dieser Materialparameter erfolgt in der Regel durch Minimierung eines Fehlerquadratfunktionals, welches Differenzen von Messwerten und zugehörigen numerisch berechneten Vergleichswerten enthält. In diesem Zusammenhang haben sich zur Lösung dieser Minimierungsaufgabe die Trust-Regio

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14

Altoumaimi, Rasha Talal. "Nonlinear Least-Square Curve Fitting of Power-Exponential Functions: Description and comparison of different fitting methods." Thesis, Mälardalens högskola, Akademin för utbildning, kultur och kommunikation, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-38606.

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This thesis examines how to find the best fit to a series of data points when curve fitting using power-exponential models. We describe the different numerical methods such as the Gauss-Newton and Levenberg-Marquardt methods to compare them for solving non-linear least squares of curve fitting using different power-exponential functions. In addition, we show the results of numerical experiments that illustrate the effectiveness of this approach.Furthermore, we show its application to the practical problems by using different sets of data such as death rates and rocket-triggered lightning retur

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15

Vitolo, Maria Giovanna. "Microwave breast imaging reconstruction." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10114/.

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In this thesis I analyzed the microwave tomography method to recognize breast can- cer. I study how identify the dielectric permittivity, the Helmoltz equation parameter used to model the real physic problem. Through a non linear least squares method I solve a problem of parameters identification; I show the theoric approach and the devel- opment to reach the results. I use the Levenberg-Marquardt algorithm, applied on COMSOL software to multiphysic models; so I do numerical proofs on semplified test problems compared to the specific real problem to solve.

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16

Kaligora, Koffi. "Caractérisation du comportement mécanique des oxydes sous stoechiometriques sous températures et atmosphères controlées." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2062.

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Cette thèse porte sur le développement d’un moyen d’essai mécanique permettant de caractériser l’effet de la pression partielle d’oxygène sur le comportement mécanique des oxydes sous-stoechiométriques de type pérovskite utilisé pour leur propriété de semi-perméation. Pour étudier ces matériaux, un nouveau protocole expérimental a été développé, ainsi qu’une méthode numérique de dépouillement ad hoc. Les essais de compression diamétrale cyclique et fluage par compression diamétrale mis en place sont réalisés dans un four d’essais mécaniques à étanchéité renforcée permettant de maitriser l’atmo

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17

Shukla, Pradyumn Kumar. "Levenberg-Marquardt Algorithms for Nonlinear Equations, Multi-objective Optimization, and Complementarity Problems." Doctoral thesis, 2009. https://tud.qucosa.de/id/qucosa%3A25251.

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The Levenberg-Marquardt algorithm is a classical method for solving nonlinear systems of equations that can come from various applications in engineering and economics. Recently, Levenberg-Marquardt methods turned out to be a valuable principle for obtaining fast convergence to a solution of the nonlinear system if the classical nonsingularity assumption is replaced by a weaker error bound condition. In this way also problems with nonisolated solutions can be treated successfully. Such problems increasingly arise in engineering applications and in mathematical programming. In this thesis we us

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18

Shukla, Pradyumn Kumar [Verfasser]. "Levenberg-Marquardt algorithms for nonlinear equations, multi-objective optimization, and complementarity problems / von Shukla, Pradyumn Kumar." 2010. http://d-nb.info/1008749842/34.

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19

Rezvani, Nargol. "Iterative Reconstruction Algorithms for Polyenergetic X-ray Computerized Tomography." Thesis, 2012. http://hdl.handle.net/1807/34865.

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A reconstruction algorithm in computerized tomography is a procedure for reconstructing the attenuation coefficientscient, a real-valued function associated with the object of interest, from the measured projection data. Generally speaking, reconstruction algorithms in CT fall into two categories: direct, e.g., filtered back-projection (FBP), or iterative. In this thesis, we discuss a new fast matrix-free iterative reconstruction method based on a polyenergetic model. While most modern x-ray CT scanners rely on the well-known filtered back-projection algorithm, the corresponding reconstructio

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20

Clausner, André. "Möglichkeiten zur Steuerung von Trust-Region Verfahren im Rahmen der Parameteridentifikation." Thesis, 2006. https://monarch.qucosa.de/id/qucosa%3A19909.

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Zur Simulation technischer Prozesse ist eine hinreichend genaue Beschreibung des Materialverhaltens notwendig. Die hierfür häufig verwendeten phänomenologischen Ansätze, wie im vorliegenden Fall die HILLsche Fließbedingung, enthalten materialspezifische Parameter, welche nicht direkt messbar sind. Die Identifikation dieser Materialparameter erfolgt in der Regel durch Minimierung eines Fehlerquadratfunktionals, welches Differenzen von Messwerten und zugehörigen numerisch berechneten Vergleichswerten enthält. In diesem Zusammenhang haben sich zur Lösung dieser Minimierungsaufgabe die Trust-Regio

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