Symmetric Nonlinear Models
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Transformações em modelos de séries temporais / Transformations in time series models
Cordeiro and Andrade (2009) incorporate the idea of transforming the response variable to the GARMA model, generalized autoregressive moving average, introduced by Benjamin et al. (2003), thus developing the TGARMA model, transformed generalized autoregressive moving average. The goal of this thesis is to develop the TGARMA model introduced by Cordeiro and A
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/05/2012
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2. Uso dos métodos clássico e bayesiano para os modelos não-lineares heterocedásticos simétricos / Use of the classical and bayesian methods for nonlinear heterocedastic symmetric models
Os modelos normais de regressão têm sido utilizados durante muitos anos para a análise de dados. Mesmo nos casos em que a normalidade não podia ser suposta, tentava-se algum tipo de transformação com o intuito de alcançar a normalidade procurada. No entanto, na prática, essas suposições sobre normalidade e linearidade nem sempre são satisfeitas. C
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/06/2011
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3. CorreÃÃo de Bartlett nos modelos nÃo-lineares simÃtricos heteroscedÃsticos
In this work, we treated of refinement of tests of hypotheses in symmetric nonlinear regression heteroskedastic models with link function any for the location and for the scale parameter. We developed, in matrix form, a Bartlettâs corrections factor to the likelihood ratio statistic in this class of models. We present, in matrix form, closed-form expression
Publicado em: 2009
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4. RICE AND RED RICE DEVELOPMENT: MODELING AND RESPONSE TO CLIMATE CHANGE / DESENVOLVIMENTO DO ARROZ E DO ARROZ VERMELHO: MODELAGEM E RESPOSTA À MUDANÇA CLIMÁTICA
Increases of 1.1 to 6.4C in temperature are projected by the end of the XXI century in several locations, including Brazil. Among processes that may be affected by increasing temperatures is the duration of the developmental cycle of crops. Simulation models are tools that allow to describe the possible interactions that take place in agroecoystems and their
Publicado em: 2008
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5. EFFICIENCY ASSESSMENT OF ADVANCED MODAL ANALYSIS AS COMPARED TO TECHNIQUES BASED ON NUMERICAL INVERSE TRANSFORMS / COMPARAÇÃO DO DESEMPENHO COMPUTACIONAL DA TÉCNICA DE SUPERPOSIÇÃO MODAL AVANÇADA COM TÉCNICAS DA TRANSFORMADA DE LAPLACE
An established technique to solve time-dependent problems is the formulation of a complete frequency-domain analysis via Laplace or Fourier transforms, with subsequent ad hoc expression of results by numerical inversion. Although usually easy to implement, such a transform inversion is computationally intensive, if accurate results are desired, and liable to
Publicado em: 2008
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6. Um modelo geometricamente exato de barras com grandes deformações, que considera a distorção e o empenamento geral da seção transversal, e sua discretização pelo método dos elementos finitos. / A fully nonlinear geometrically exact multi-parameter rod model that incorporates general in-plane and out-of-plane cross-sectional changes, and its discretization by Finite Element Method.
The main purpose of this work is to present a fully nonlinear geometrically-exact multi-parameter rod model that incorporates general in-plane cross-sectional changes as well as general out-of-plane cross-sectional warping. The formulation constitutes an extension of the earlier works presented in [1] to [6], [8] and [9], in the sense that the restrictions t
Publicado em: 2008
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7. AperfeiÃoamento de testes de hipÃteses para modelos nÃo-lineares simÃtricos
Neste trabalho, tratamos de refinamentos para testes de hipÃteses em modelos de regressÃo nÃo-lineares simÃtricos, assumindo que o parÃmetro de escala à desconhecido. Apresentamos, em notaÃÃo matricial, fatores de correÃÃo de Bartlett e tipo-Bartlett para melhorar as estatÃsticas da razÃo de verossimilhanÃas e escore, respectivamente, nesta clas
Publicado em: 2007
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8. Emergence of complex spatio-temporal order in nonlinear field theories
We investigate the emergence of time-dependent nonperturbative configurations during the evolution of nonlinear scalar field models with symmetric and asymmetric double-well potentials. Complex spatio-temporal behavior emerges as the system seeks to establish equipartition after a fast quench. We show that fast quenches may dramatically modify the decay rate
Brazilian Journal of Physics. Publicado em: 2006-12
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9. Um modelo de espaço de estados com representação de segunda ordem para a analise das oscilações de modo interarea em sistemas de energia eletrica / A space state model including second order representation for the analysis of power systems inter-area mode oscillations
In this work, the analysis of power systems inter-area mode oscillations is performed by the application of two different methodologies: first, the linear modal analysis, and then the analysis including second order nonlinear terms from a Taylor series expansion, with the application of the method of normal forms of vector fields. In this case, the method of
Publicado em: 2005
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10. Cordas cosmicas e vortices em relatividade geral : pertubações radiais de soluções estaticas e estacionarias
A linearized theory of the dynamics of small perturbations of certain cylindrically symmetric systems in general relativity is presented. Firstly, we deal with straight, static cosmic strings of finite thickness in the U(l) gauge theory coupled to the Einstein equations. Taking into account the asymptotic behavior of the solution and certain integral ide
Publicado em: 1994
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11. Linkage and the Maintenance of Heritable Variation by Mutation-Selection Balance
The role of linkage in influencing heritable variation maintained through a balance between mutation and stabilizing selection is investigated for two different models. In both cases one trait is considered and the interactions within and between loci are assumed to be additive. Contrary to most earlier investigations of this problem no a priori assumptions