Piecewise Linear Models
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. A study of publication trajectories of the Brazilian Computer Science community
Abstract: The average faculty productivity have been described as a rapid rise-short peak-gradual decline pattern. Way et al. (2017) have studied this pattern for faculty careers in Computer Science in North America using a piecewise linear model. In this paper, we use a similar methodology and study trajectories (N = 20655) of the Brazilian Computer Science
An. Acad. Bras. Ciênc.. Publicado em: 16/09/2019
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2. A Mixed-Integer convex formulation for production optimization of gas-lifted oil fields with routing and pressure constraints
Production optimization of gas-lifted oil fields under facility, routing, and pressure constraints has attracted the attention of researchers and practitioners for its scientific challenges and economic impact. The available methods fall into one of two categories: nonlinear or piecewise-linear approaches. The nonlinear methods optimize simulation models dir
Braz. J. Chem. Eng.. Publicado em: 2014-06
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3. Comparison between Least-Square support vector machines and linear methods for calibration transfer / Comparação entre maquinas de vetores de suporte por minimos quadrados (LS-SVM) e metodos lineares para transferencia de calibração
The aim of this work was to compare the linear methods of calibration Partial Least Squares (PLS) and Piece-wise Direct Standardization (PDS) and a nonlinear method Least-Squares Support Vector Machines (LS-SVM) on calibration transfer to multivariate calibration models to the determination of alcoholic grade in cachaça in five different tempera
Publicado em: 2007
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4. Fuzzy pole placement based on piecewise Lyapunov functions / Controle fuzzy via alocação de pólos com funções de Lyapunov por partes
This work presents a controller design method for fuzzy dynamic systems based on piecewise Lyapunov functions with constraints on the closed-loop pole location. The main idea is to use switched controllers to locate the poles of the system to obtain a satisfactory transient response. The pole placement strategy allows to specify the performance in terms of t
Publicado em: 2006
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5. IDENTIFICATION MECHANISMS OF SPURIOUS DIVISIONS IN THRESHOLD AUTOREGRESSIVE MODELS / MECANISMOS DE IDENTIFICAÇÃO DE DIVISÕES ESPÚRIAS EM MODELOS DE REGRESSÃO COM LIMIARES
O objetivo desta dissertação é propor um mecanismo de testes para a avaliação dos resultados obtidos em uma modelagem TS-TARX.A principal motivação é encontrar uma solução para um problema comum na modelagem TS-TARX : os modelos espúrios que são gerados durante o processo de divisão do espaço das variáveis independentes.O modelo é uma heurís
Publicado em: 2002
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6. MODELOS DE REGRESSÃO LINEAR NEBULOSA / FUZZY LINEAR REGRESSIVE MODELS
In this dissertation a Fuzzy Piece-Wise Linear Regressive model FPLieR is developed. The model´s structure combines linear regressive models with fuzzy logic´s grade of membership in a piece-wise fashion. A comparision is made between this model and the linear regression one. The results show that FPLieR is able to find the linear substructure of simulated
Publicado em: 1998
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7. MODELOS HÍBRIDOS AUTOREGRESSIVO-NEURAIS PARA SÉRIES TEMPORAIS / AUTOREGRESSIVE-NEURAL HYBRID MODELS FOR TIME SERIES
In this thesis we develop a piece-wise linear model named ARN model. Our model has a hybrid structure which combines autoregressive models and neural networks. We compare our model to the fixed-coefficient AR model and to the prediction static neural network. Our results show that ARN is able to find the non-linear structure of simulated data and in most cas
Publicado em: 1997