Coding Theory
Mostrando 25-36 de 88 artigos, teses e dissertações.
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25. OPEN DVC: A TOOL FOR SIMULATION AND EVALUATION OF DISTRIBUTED VIDEO CODING / OPEN DVC: UMA FERRAMENTA PARA SIMULAÇÃO E AVALIAÇÃO DE CODIFICAÇÃO DISTRIBUÍDA DE VÍDEO
Codificação Distribuída de Vídeo (Distributed Video Coding ¿ DVC) é um paradigma de codificação baseado nos conceitos da Codificação Distribuída de Fontes correlatadas (Distributed Source Coding ¿ DSC), que tem como arcabouço a Teoria da Informação desenvolvida por Shannon, para um cenário onde temos uma codificação distribuída dos element
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/04/2011
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26. Salud bucal: representaciones sociales en madres gestantes de una población urbana. Medellín, Colombia
Based on the theory of social representations, a qualitative investigation was conducted in order to assess social representations in oral heath in pregnant mothers living in an urban environment. Twenty-eight pregnant adult women attending a prenatal program at a health institution in the city of Medellín, Colombia, were interviewed. The interviews were re
Ciência & Saúde Coletiva. Publicado em: 2011-11
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27. Dissecação dinâmica de condutâncias iônicas em tempo real / Dynamic dissection of ionic conductances in real time
Investigamos o papel de condutâncias iônicas lentas na transmissão/codificação de informação entre neurônios que disparam em rajadas ou bursts. Para isso, desenvolvemos um protocolo experimental no qual a interação em tempo real entre computador e neurônio biológico permite isolar o efeito da dinâmica de um determinado tipo de canal iônico e es
Publicado em: 2011
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28. E tenho dito: a gramaticalizaÃÃo e a variaÃÃo do pretÃrito perfeito composto em narrativas dos sÃculos XV a XVII / And I have said: The grammaticalization and the change in past tense compound in narratives in century XV - XVII
In this dissertation, we deal with the grammaticalization of past tense compound in Portuguese. We discuss linguistic change, based on the correlation form(s)-function(s) in two lines of analysis: (I) the grammaticalization continuum of to have/there to be (full) + adjectival participle >to have/there to be (auxiliary) + verb participle and (ii) the linguist
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/12/2010
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29. Desempenho de codigo turbo quaternario em sistemas de multiplexação por divisão de frequencias ortogonais / Performance of quaternary turbo codes in orthogonal frequency division multiplex systems
This study evaluates the performance of quaternary turbo codes, with generator matrix G = [7, 5] for the constituent convolutional codes and s-random interleaving , in an OFDM transmission system. This performance is measured in terms of bit error rate versus energy per bit to unilateral noise power spectral density ratio. The results obtained are analyzed c
Publicado em: 2010
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30. Modelo de sistema de comunicações digital para o mecanismo de importação de proteinas mitocondriais atraves de codigos corretores de erros / Digital communication system model for mitochondrial protein import by use of error-correcting codes
One of the puzzling problems in mathematical biology is to show the existence of any form of error-correcting code in the DNA structure. Using information theory considerations we propose a model for the biological coding system similar to that of a digital communication system. This model consists of a mapper (transformations from the set of nucleotides eit
Publicado em: 2010
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31. Construction of topological quantum codes on bidimensional manifolds / Analise e construção de codigos quanticos topologicos sobre variedades bidimensionais
In this work we present an extensive study of topological quantum codes. As a consequence, new promising ideas, concepts and results are also presented. First of all, new toric quantum codes are constructed among which the [[d2,2,d]] class stands out as the best known so far. This proposed construction of toric codes is realized based upon group theory and c
Publicado em: 2009
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32. COVERING CODES: BOUNDS AND HEURISTICS / CÓDIGOS DE ABERTURA: LIMITES E HEURÍSTICAS
Data compression, speech coding, móbile telecommunications and error-corretion are some of the practical apllications of the covering codes study, an important field of coding theory. This work addresses two problems of covering codes: the classic code covering problem and the recent short code covering problem. It presents an application of Reactive Tabu S
Publicado em: 2009
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33. Isometric embeddings of the hyperbolic plane in Euclidean spaces / Mergulhos isométricos do plano hiperbólico em espaços Euclidianos
In this dissertation we present analytic expressions for isometric embeddings of hyperbolic plane (H2; ds) with Riemannian metric ds2 = dx2 + cosh2 (x) dy2 in Euclidean spaces R6 and S8 R9. Besides isometric embeddings, we present analytic expressions for isometries between the Euclidean models of the Poincaré disk, Upper Half-Plane and the model (H; ds) ci
Publicado em: 2009
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34. Impacto da utilização de tecnicas de lifting explorando diferença entre ferramentas interpretada e compilada na velocidade computacional da codificação wavelet de imagens estaticas / Impact of using lifting techniques to explore the differences between interpreted and compiled tools in the computational speed of wavelet static image coding
The field of analysis and compression of images has been received special attention of the scientific community because of including in the main systems of digital TV, satellite communications and mobile communications. In this context, the Discrete Transform Wavelet (TWD) arise how a powerful tool and its many advantages allowed your insertion in important
Publicado em: 2009
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35. Contributions to the search methods of optimum trellis codes on new lattices partitioning / Contribuições aos metodos de procura dos codigos de treliça otimos sobre novas partições de reticulados
This thesis presents some contributions to the coded modulation schemes for the trellis codes based on lattices partitioning. One of the main contributions is the construction of the trellis codes based on novel lattices partitioning and also on chains partitioning. In order to optimize the search for the optimum trellis codes, a search algorithm was propose
Publicado em: 2008
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36. Discrete Geometry and Codes / Geometria discreta e codigos
The research developed here is related and inspired by problems in coding theory. It is presented in two parts. In the first we focus on the search for the minimum nonvanishing vector of a lattice, specially in the case of a projection of the ndimensional integer lattice in the direction of one of its vectors. This is a problem of high computational complexi
Publicado em: 2007