A Priori Estimates
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. Variational Formulation and A Priori Estimates for the Galerkin Method for a Fractional Diffusion Equation
ABSTRACT In this work we obtain a variational formulation and a priori estimates for approximate solutions of a problem involving fractional diffusion equations.
Trends in Computational and Applied Mathematics. Publicado em: 2022
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2. Bayesian modeling of the maximum streamflows from the Furnas reservoir
ABSTRACT The objective of this work was to predict the maximum flow of the Furnas reservoir in the dry and wet periods. The generalized distribution of extreme values (GEV) was used with parameter estimation via Bayesian inference. Data on average daily streamflows corresponding to the years 1965 to 2017 were obtained from Hidroweb, by the National Agency fo
Engenharia Sanitaria e Ambiental. Publicado em: 2022
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3. Bayesian factor analysis for mixed data on management studies
Abstract Purpose Factor analysis is the most used tool in organizational research and its widespread use in scale validations contribute to decision-making in management. However, standard factor analysis is not always applied correctly mainly due to the misuse of ordinal data as interval data and the inadequacy of the former for classical factor analysis.
RAUSP Manag. J.. Publicado em: 13/12/2019
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4. Tasas corregidas de mortalidad atribuible a la demencia por la enfermedad de Alzheimer, Brasil, 2009-2013
Este artigo oferece estimativas das taxas de mortalidade devidas à demência pela doença de Alzheimer (DA) na população idosa brasileira. Para isso, foram usados dados do Censo de Demográfico de 2010 do Instituto Brasileiro de Geografia e Estatística (IBGE) e microdados de mortalidade das 27 capitais dos estados brasileiros, registradas no Sistema de I
Cad. Saúde Pública. Publicado em: 04/07/2019
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5. Bayesian estimation of genotypic and phenotypic correlations from crop variety trials
Abstract Genotypic and phenotypic correlations are necessary for constructing indirect selection indices. Bayesian analysis, therefore, was applied to obtain posterior distributions of the correlations, and the estimates were compared with those under a frequentist approach. Three a priori distributions for standard deviation components based on uniform dist
Crop Breed. Appl. Biotechnol.. Publicado em: 2016-03
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6. A vibroacoustic application of modeling and control of linear parameter-varying systems
This paper applies recent advances in both modeling and control of Linear Parameter-Varying (LPV) systems to a vibroacoustic setup whose dynamics is highly sensitive to variations in the temperature. Based on experimental data, an LPV model is derived for this system using the State-space Model Interpolation of Local Estimates (SMILE) technique. This modelin
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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7. ABP estimates and Ambrosetti-Prodi type problems for nonlinear differential operators / Estimativas ABP e problemas do tipo Ambrosetti-Prodi para operadores diferenciais não lineares
The aim of this work is to obtain ABP estimates for fully nonlinear operators and to study problems of the Ambrosetti-Prodi type for the p-Laplacian operator in two cases: superlinear case for the equation and the sublinear case for the system. For this, we use the sub and supersolution method and the Leray Schauder degree theory, to obtain in the two cases,
Publicado em: 2009
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8. Pollutant dispersal in an air-water system mathematical modeling numerical aproximation and computational simulations / Dispersão de poluentes num sistema ar-agua : modelagem matematica, aproximação numerica e simulação computacional
This work considers a three-dimensional air-water system pollution discharge problem, modelling it with a system of partial differential equations which includes both the diffusionadvection evolutionary and Stoke s equations. Appropriate boundary conditions are considered, including for the air-water interface, and special attention is dedicated to existence
Publicado em: 2008
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9. Análise bayesiana em modelos TRI de três parâmetros. / Bayesian analysis for three parameters IRT models
In this dissertation the bayesian analysis for three parameters IRT (Item Response Theory) models with binaries and ordinals responses, considering the probit model, was discussed. For both cases, binary and ordinal, techniques based on MCCM (Monte Carlo Markov Chain) were used to estimate the items parameters. For binary response model, was considered two d
Publicado em: 2008
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10. Aprendizado transdutivo baseado em teoria da informação e teoria do aprendizado estatístico
The machine learning problem is most frequently proposed and solved under the inductive inference paradigm, based on classical inductive principles such as the Empirical Risk Minimization (ERM) and Structural Risk Minimization (SRM). These principles are based on the attempt to create a learning rule given some finite training data. They rely on two assumpti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/07/2007
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11. Construction of one priori for the parameters of the generalized extreme values model based in quantis with Gumbel distribution / ConstruÃÃo de uma Priori para os parÃmetros do Modelo de Valores Extremos Generalizado baseada em Quantis com DistribuiÃÃo Gumbel
The generalized extreme value distribution (GEV) plays a key role in studies related to physical measurements where it is applied to describe the behavior of the extreme values or rare event As these values are extracted from the upper (or lower) tail of the original distribution, a scarce amount of data is obtained in most cases This can be usually a proble
Publicado em: 2006
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12. Estimativas de máxima verosimilhança e bayesianas do número de erros de um software.
In this work we present the methodology of capture-recapture, under the classic and bayesian approach, to estimate the number of errors of software through inspection by distinct reviewers. We present the general statistical model considering independence among errors and among reviewers and consider the particular cases of equally detectable errors (homogen
Publicado em: 2006