Adaptive Algorithms
Mostrando 25-36 de 110 artigos, teses e dissertações.
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25. Uma proposta de estimação de movimento para o codificador de vídeo Dirac / A proposal of motion estimation for Dirac video codec
The main purpose of this work is to design a new algorithm which enhance motion estimation in Dirac video codec. Motion estimation is a critical stage in video coding, in which most of the processing lies. Dirac codec, recently released, is based on techniques different from the usually employed (as in MPEG-based codecs). Dirac video codec aims at achieving
Publicado em: 2010
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26. Algoritmos e desenvolvimento de arquitetura para codificação binária adaptativa ao contexto para o decodificador H.264/AVC / Algorithms and architecture design for context-adaptive binary arithmetic coder for the H.264/AVC decoder
As inovações tecnológicas têm propiciado transformações nas formas de interação e, principalmente, na comunicação entre as pessoas. Os avanços nas áreas de tecnologia da informação e comunicações abriram novos horizontes para a criação de demandas até então não existentes. Nesse contexto, a utilização de vídeo digital de alta definiç
Publicado em: 2010
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27. Processamento de imagens baseado em algoritmos genéticos fuzzy intervalares / IMAGE PROCESSING BASED ON FUZZY INTERVAL GENETIC ALGORITHMS
A osteoporose é uma doença caracterizada pela diminuição da massa óssea e deterioração na microarquitetura do tecido ósseo. Além disso, é a doença metabólica mais comum e a principal causa de fraturas por fragilidade esquelética. Assim, a osteoporose é mundialmente considerada um dos principais problemas de saúde pública, dada a prevalência
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/08/2009
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28. An assessment of unstructured grid finite volume schemes for cold gas hypersonic flow calculations
Abstract: A comparison of five different spatial discretization schemes is performed considering a typical high speed flow application. Flowfields are simulated using the 2-D Euler equations, discretized in a cell-centered finite volume procedure on unstructured triangular meshes. The algorithms studied include a central difference-type scheme, and 1st- and
J. Aerosp. Technol. Manag.. Publicado em: 2009-12
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29. Proposta de integração entre tecnologias adaptativas e algoritmos genéticos. / Proposal for integration of adaptive technology and genetic algorithms.
This work is an initial study about the integration of two computing engineering areas, the adaptive technologies and the genetic algorithms. For that, it was per- formed the application of genetic algorithms for the adaptive automata inference. Several techniques were studied and proposed along the algorithm implementation, always seeking for more satisfyin
Publicado em: 2009
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30. Combinação afim de algoritmos adaptativos. / Affine combination of adaptive algorithms.
In order to improve the performance of adaptive filters, the combination of algorithms is receiving much attention in the literature. This method combines linearly the outputs of two filters operating in parallel with different step-sizes to obtain an adaptive filter with fast convergence and reduced excess mean squared error (EMSE). In this context, it was
Publicado em: 2009
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31. MÃtodo adaptativo de Markov Chain Monte Carlo para manipulaÃÃo de modelos Bayesianos
Historically, Bayesian models have deserved special attention from academy and applied fields mainly by allowing mathematical combination of human judgments and empirical data. Markov Chain Monte Carlo (MCMC) methodology is one of the main classes of approaches for computing marginal estimates from Bayesian models. Among Markov Chain Monte Carlo methods, Met
Publicado em: 2009
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32. Gait-pattern adaptation algorithms using neural network / Algoritmos de adaptação do padrão de marcha utilizando redes neurais
Este trabalho apresenta o desenvolvimento de algoritmos de adaptação do padrão de marcha com a utilização de redes neurais artificiais para uma órtese ativa para membros inferiores. Trajetórias estáveis são geradas durante o processo de otimização, considerando um gerador de trajetórias baseado no critério do ZMP (Zero Moment Point) e no modelo
Publicado em: 2009
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33. A service-oriented infrastructure for ecological niche modelling. / Uma infraestrutura orientada a serviços para a modelagem de nicho ecológico.
Ecological niche modelling combines environmental data and information about the occurrence of a species to obtain models to describe its probabilistic distribution in a region. Computational algorithms generate models based on the hypothesis that, if a species was found under the conditions which define its niche, then it may survive in any place which offe
Publicado em: 2009
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34. Simulador de meios porosos saturados elastoplasticos / Numerical simulator of saturated elastoplastic porous media
The exploration of mineral resources is growing in importance in the Brazilian economy. Since the environments in which these resources are found are becoming increasingly more complex and challenging for the production phase, currently unavailable knowledge and technologies are required to produce these reserves. In the particular well drilling and completi
Publicado em: 2009
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35. Mathematical Modeling and Numeriacal Methods for Simulation of the Heat Conduction in Liquid Helium / Modelagem Matemática e Métodos Numéricos para Simulação da Condução do Calor no Hélio Líquido
The element helium, found mainly in natural gas reserves, condenses at temperature of 4.2K, and is the unique known substance that remains in liquid to absolute zero. In the liquid phase, the helium presents still another phase change in 2.19K, where passes of common liquid to superfluous liquid, with almost zero viscosity. These properties give the helium i
Publicado em: 2009
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36. Estudo comparativo entre metaheutísticas populacionais com tamanho da população variável
This work introduces four novel population-based heuristic algorithms, whose population size varies along the execution, which are aimed at solving problems of search and numerical optimization. These algorithms are extensions of the standard models of two metaheuristics recently proposed in the literature, which have been successfully applied in different f
Publicado em: 2008