Sparse Matrix
Mostrando 1-12 de 40 artigos, teses e dissertações.
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1. Sparse Estimation of the Precision Matrix and Plug-In Principle in Linear Discriminant Analysis for Hyperspectral Image Classification
ABSTRACT In this paper, a new method for supervised classification of hyperspectral images is proposed for the case in which the size of the training sample is small. It consists of replacing in the Mahalanobis distance the maximum likelihood estimator of the precision matrix by a sparse estimator. The method is compared with two other existing versions of L
Trends in Computational and Applied Mathematics. Publicado em: 2022
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2. An Experimental Analysis of Three Pseudo-peripheral Vertex Finders in conjunction with the Reverse Cuthill-McKee Method for Bandwidth Reduction
RESUMO. A necessidade de se determinar vértices pseudoperiféricos surge de diversas abordagens por teoria dos grafos de ordenação de linhas e colunas de sistemas de equações lineares compostos de matrizes esparsas. Neste trabalho, são mostrados resultados de dois algoritmos para encontrar vértices pseudoperiféricos: George-Liu e Kaveh-Bondarabady. O
TEMA (São Carlos). Publicado em: 13/12/2019
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3. A New Hybrid Preconditioner for the Interior Point Method
RESUMO Este trabalho visa melhorar o cálculo da direção de busca no Método de Pontos Interiores primal-dual usando métodos iterativos precondicionados. Trata-se de uma abordagem híbrida que combina o precondicionador Fatoração Controlada de Cholesky e o precondicionador Separador. Esta abordagem tem mostrado bons resultados, entretanto, nesses préco
TEMA (São Carlos). Publicado em: 16/09/2019
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4. A NOVEL LATENT FACTOR MODEL FOR RECOMMENDER SYSTEM
ABSTRACT Matrix factorization (MF) has evolved as one of the better practice to handle sparse data in field of recommender systems. Funk singular value decomposition (SVD) is a variant of MF that exists as state-of-the-art method that enabled winning the Netflix prize competition. The method is widely used with modifications in present day research in field
JISTEM J.Inf.Syst. Technol. Manag.. Publicado em: 2016-12
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5. Representação esparsa e modelo de esparsidade conjunta no reconhecimento de faces / Sparse Representation and Joint Sparsity Model in Face Recognition
O trabalho desenvolvido nesta dissertação propõe a utilização do modelo de esparsidade conjunta com complemento de matrizes (JSM-MC) para composição da base de treino no contexto de reconhecimento de faces utilizando o classificador baseado em representação esparsa (SRC). O método proposto visa trabalhar com imagens de faces em diferentes condiçõ
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/07/2012
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6. A new block algorithm for full-rank solution of the Sylvester-observer equation
A new block algorithm for computing a full rank solution of the Sylvester-observer equation arising in state estimation is proposed. The major computational kernels of this algorithm are: 1) solutions of standard Sylvester equations, in each case of which one of the matrices is of much smaller order than that of the system matrix and (furthermore, this small
Publicado em: 2011
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7. Contribution of the LU factorization update in the Simplex method / Contribuição da atualização da decomposição LU no metodo Simplex
Finding efficient solution of linear systems is fundamental in the linear programming problems and the first method to obtain success for this class of problems was the Simplex method. With the objective to develop efficient alternatives to its implementation, techniques of the simplex basis LU factorization update are developed in this thesis to improve the
Publicado em: 2009
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8. Tensorização de matrizes de rigidez para quadrados e hexaedros finitos de alta ordem / Tensorization of stiffness matrices for squares and hexaedral using high order FEM
High-order Finite Element Methods have been applied with success to problems of Fluid Dynamics and Electromagnetism. The main feature of these methods is to present an exponential convergence rate for problems with polinomial solution. However, due to the use of high-order interpolation functions, the elemental matrices are denser. This work shows a mathemat
Publicado em: 2009
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9. Crop rotation Scheduling - modeling and solution methodolies / Programação de rotação de culturas - modelos e métodos de solução
Over the last decades, various proposals for techniques and processes to increase agricultural sustainability have been put forward. These proposals bring new planning models in which technical and ecological production aspects must be considered, as well as the access of small farmers to the consumer market. In this type of agricultural production planning,
Publicado em: 2009
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10. Caracterização estrutural da forma recombinante da proteína Pb27 de Paracoccidioides brasiliensis
COITINHO, J. B. Structural characterization of recombinant form of the protein Pb27 from Paracoccidioides brasiliensis. 2009. Dissertation (Masters). Departamento de Bioquímica e Imunologia. Universidade Federal de Minas Gerais. Belo Horizonte, 2009. Paracoccidiodomycosis (PCM) is one of the most important systemic mycoses in Brazil. The etiologic agent of
Publicado em: 2009
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11. Analysis of the Clustering Algorithms for the Databases / Análise de Algoritmos de Agrupamento para Base de Dados Textuais
The increasing amount of digitally stored texts makes necessary the development of computational tools to allow the access of information and knowledge in an efficient and efficacious manner. This problem is extremely relevant in biomedicine research, since most of the generated knowledge is translated into scientific articles and it is necessary to have the
Publicado em: 2008
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12. Estudo histoquímico e ultra-estrutural da distribuição das fibras da matriz extracelular na prega vocal humana fetal no período perinatal / Histochemical and ultrastructural study on the distribution of the extracellular matrix fibers in the human fetal vocal fold
It is currently believed that, in humans, the vocal ligament develops after birth. However, there is no consensus in the literature about the age of its surge. Most papers describe that in the newborn, the lamina propria shows the presence of some sparse fibers without any particular organization. The main purpose of this study was to obtain information rega
Publicado em: 2008