Non Parametric Models
Mostrando 13-24 de 74 artigos, teses e dissertações.
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13. Machinability Evaluation in Hard Milling of AISI D2 Steel
Milling of hardened steel components provides considerable benefits in terms of reduced manufacturing cost and time compared to traditional machining. Temperature variation in milling is an important factor affecting the wear of cutting tools. The poor selection of milling parameters may cause excessive tool wear and increased work surface roughness. Hence,
Mat. Res.. Publicado em: 01/03/2016
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14. Structural analyses of reinforced tubular T-joints
Abstract The use of rolled hollow sections has been substantially boosted mainly due to the advantages associated with structural behavior and aesthetics, leading to an intense use in Europe, Southeast Asia, North America, Australia, and now, in Brazil due to the wider supply of these profiles. Therefore, it is important to investigate the structural behavio
Rem: Rev. Esc. Minas. Publicado em: 2016-03
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15. Comportamientos de riesgo de suicidio y calidad de vida, por género, en adolescentes mexicanos, estudiantes de preparatoria
The study of pre-suicidal behaviors is important not only because of their association with suicide but also because of their impact on quality of life (QOL). Given the scarcity of information regarding this relationship in adolescence, the objective of this study was to analyze the association between suicidal-related behavior and QOL according to gender in
Ciênc. saúde coletiva. Publicado em: 2015-11
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16. Estimação e previsão da estrutura a termo das taxas de juros usando técnicas de inteligência computacional / Term structure of interest rate modeling and forecasting using computational intelligence techniques
This work proposes the term structure of interest rates modeling and forecasting using computational intelligence techniques, based on data from the US and Brazilian fixed income markets. The yield curve modeling includes the use of some evolutionary computation methods like Genetic Algorithms, Differential Evolution and Evolution Strategies in comparison wi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/06/2012
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17. Empirical distribution of eigenvalues associated with the interaction matrix of the AMMI models for non-parametric bootstrap method / Distribuição empírica dos autovalores associados à matriz de interação dos modelos AMMI pelo método bootstrap não-paramétrico
A interação genótipos ambientes (G E) foi definido por Shelbourne (1972) como sendo a variação entre genótipos em resposta a diferentes condições ambientais. Sua magnitude na expressão fenotípica do caráter pode reduzir a correlação entre fenótipo e genótipo, in acionando a variância genética e, por sua vez, parâmetros dependentes desta, co
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/01/2012
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18. Heifer Retention Program in the Pantanal: a study with data envelopment analysis (DEA) and Malmquist index
The objective of this study was to propose Data Envelopment Analysis (DEA) models and non-parametric Malmquist indexes to evaluate the efficiency of 11 livestock farms in the Pantanal region. These farms took out a loan from 'Fundo Constitucional de Financiamento do Centro-Oeste' - FCO (Constitutional Financial Fund for the Midwest), a line of credit for fin
R. Bras. Zootec.. Publicado em: 2012-08
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19. Identidade, discriminação e saúde mental em estudantes universitários / Identity, discrimination and mental health in undergraduate students
Objectives: To research, on a sample of undergraduate students from the University of Campinas, if reports of different kinds of experiences of feeling discriminated can be related to worse indicators of quality of life and to psychopathological repercussions, identifying possible social, ethnic, demographic and cultural factors which can exert modulation on
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/06/2011
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20. Using nonparametric analysis (DEA) for measuring technical efficiency in poultry farms
The objective of this study was to determine the economic efficiency of resource utilization in broiler production farms using a non-parametric production function, data envelopment analysis (DEA). Data for the analysis were collected from a cross section of 44 farmers using a multi-stage sampling procedure. In DEA models the farmers that produce their level
Revista Brasileira de Ciência Avícola. Publicado em: 2011-12
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21. Parametric analysis of a phenomenological model for vortex-induced motions of monocolumn platforms
Phenomenological models are an important branch in VIV (Vortex-Induced Vibrations) and in VIM (Vortex-Induced Motions) studies to complement the results achieved via CFD (Computational Fluid Dynamics), as the latter tool is not presently a suitable tool for intense use in engineering analysis, due to high computer power requirements. A phenomenological model
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-06
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22. Efficiency and sustainability assessment for a group of farmers in the Brazilian Amazon.
The aim of this paper is to use DEA models to evaluate sustainability in agriculture. Several variables are taken into account and the resulting efficiency is measured by comparison. The performance of family farms is analysed here (variables: farmed area, work force, and production). As agricultural sustainability depends on the maintenance of systems of pr
Annals of Operations Research. Publicado em: 2011
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23. Modelo logístico generalizado dependente do tempo com fragilidade
Several authors have preferred to model survival data in the presence of covariates through the hazard function, a fact related to its interpretation. The hazard function describes as the instantaneous average of failure changes over time. In this context, one of the most used models is the Coxs model (1972), in which the basic supposition for its use is tha
Publicado em: 2011
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24. Análise da correlação entre o Ibovespa e o ativo petr4 : estimação via modelos Garch e modelos aditivos
A estimação e previsão da volatilidade de ativos são de suma importância para os mercados financeiros. Temas como risco e incerteza na teoria econômica incentivaram a procura por métodos capazes de modelar a variância condicional que evolui ao longo do tempo. O objetivo central desta dissertação foi modelar via modelos ARCH – GARCH e modelos adit
Publicado em: 2010