Parametric Identification
Mostrando 37-48 de 56 artigos, teses e dissertações.
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37. Selection index in upland cotton cultivars / Índice de seleção em cultivares de algodoeiro herbáceo
Selection indices are linear combinations of phenotypic values, which combine in one unique value the positive and negative attributes of each genotype for the characters evaluated. Because these indices need estimates of genetic and phenotypic variances and covariances, their use is best suited in recurrent selection programs. However, other types of non-li
Publicado em: 2005
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38. Speed control of an automodel using neural networks / Utilização de redes neurais no controle da velocidade de um veículo experimental
This work studies the application of projects that use neural networks for identification systems and control of speed, to make the system control more robust to the parametric and measure variations, and mainly to compensate the non-linear effect of the gain related to the inherent range of operation to the speed systems. For simulation and test an automode
Publicado em: 2004
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39. STATIC AND DYNAMIC INSTABILITY OF PLANE FRAMES WITH SEMI-RIGID CONNECTIONS / INSTABILIDADE ESTÁTICA E DINÂMICA DE PÓRTICOS PLANOS COM LIGAÇÕES SEMI-RÍGIDAS
The main objective of this thesis is to develop a numerical methodology for the nonlinear static and dynamics analysis of plane frames with semi-rigid connections. Initially, the formulations of the adopted finite elements are presented and implemented together with numerical methodologies for the solution of the non-linear equilibrium equations. Then, some
Publicado em: 2004
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40. A SUGGESTION FOR THE STRUCTURE IDENTIFICATION OF LINEAR AND NON LINEAR TIME SERIES BY THE USE OF NON PARAMETRIC REGRESSION / UMA SUGESTÃO PARA IDENTIFICAÇÃO DA ESTRUTURA DE SÉRIES TEMPORAIS, LINEARES E NÃO LINEARES, UTILIZANDO REGRESSÃO NÃO PARAMÉTRICA
Esta pesquisa fundamenta-se na elaboração de uma metodologia para identificação da estrutura de séries temporais lineares e não lineares, baseada na estimação não paramétrica e semi-paramétrica de curvas em modelos do tipo Yt=E(Yt|Xt) +e, onde Xt=(Yt-1, Yt-2,...,Yt-d). Um modelo de regressão linear paramétrico tradicional assume que a forma da f
Publicado em: 2004
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41. PARAMETRIC IDENTIFICATION OF MECHANICAL SYSTEMS USING SUBSPACE ALGORITHMS / IDENTIFICAÇÃO PARAMÉTRICA DE SISTEMAS MECÂNICOS USANDO ALGORITMOS DE SUBESPAÇO
Parametric identification of mechanical systems is one of the main applications of the system identification techniques in Mechanical Engineering, specifically for the identification of modal parameters of flexible structures. One of the main problems in the identification is the presence of noise in the measurements. This work presents an analysis in the pr
Publicado em: 2003
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42. Analysis of the pattern of heart rate response by the time series and semiparametric methods and of its variability in the determination of the anaerobic threshold. / Análises do padrão de resposta da freqüência cardíaca pelos métodos de séries temporais e semiparamétrico e de sua variabilidade na determinação do limiar de anaerobiose
The objectives of the present study were to assess the heart rate (HR) response and its variability under resting conditions and during dynamic physical exercise, to determine the anaerobic threshold from the analysis of the HR responses during physical exercise using the autoregressive-integrated-moving average (ARIMA) and semi-parametric (SMP) mathematical
Publicado em: 2003
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43. Identificação e controle de processos não lineares utilizando redes neurais artificiais
Considering that most of the industrial processes of interest to Chemical Engineering present a certain degree of inherent non-linearity or one introduced by systems of automatic control, an important necessity of inquiring about the performance the new techniques derived from artificial intelligence, whose interest here is in the artificial neural networks,
Publicado em: 2001
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44. Biometrical aspects of QTL detection in cultivated species. / Aspectos biométricos da detecção de QTL S ("Quantitative Trait Loci") em espécies cultivadas.
In general terms, QTL mapping di®ers from other research ac-tivities in genetics. Being basically a multiple test procedure, problems arise which are related to the joint level of signi¯cance of the analysis, and consequently, to its power. Using computational simulation of data, the power of simple marker analysis, carried out through multiple linear regr
Publicado em: 2001
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45. Aplicação da tecnica parametrica ARMA de processamentos de sinais na caracterização de estruturas mecanicas / Application of the ARMA parametric technique to signal processing on mechanical structures characterisation
Esta tese trata do estudo de teorias, estratégias e metodologias de identificação de sistemas aplicado à análise de sinais de estruturas mecânicas. A abordagem do problema de identificação no contexto das áreas afins de análise de sinais, análise de séries temporais e análise modal é também discutida no trabalho. O enfoque central da pesquisa
Publicado em: 1998
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46. Uma abordagem neuro- nebulosa para otimização de sistema e indentificação robusta
The ability of artificial neural networks to solve complex and diversified problems make them attractive for application in many áreas of engineering and science. A neural network is basically composed of many simple processing elements with a high degree of connectivity among them. This thesis presents an architecture of artificial neural network to apply
Publicado em: 1997
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47. Desenvolvimento de ferramentas de identificação parametrica de sistemas mecanicos no dominio do tempo
The Work presents a collection of parametric and non parametric time domain identification techniques, employed in the modal analysis of a mechanical system. The dynamical behaviour of the system is studied from a linear model of the same, built from discrete parameters. The main characteristic of the work is the employment of computational techniques of lin
Publicado em: 1993
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48. BOOTSTRAP EM SÉRIES TEMPORAIS / BOOTSTRAP IN TIME SERIES
The bootstrap of B. Efron, what should not be imagined without fast andcheaper computation, can solve several problems free from assumption that the data conform to a bell-shaped curve. This work has the aim to present this computer-intensive technics in the context of Time Series - Box and Jenkins´s Methodology. As we know this methodology own some asympto
Publicado em: 1991