Factorization
Mostrando 1-12 de 58 artigos, teses e dissertações.
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1. A New Approach to the Splitting Factor Preconditioner Applied to Linear Programming Problems
ABSTRACT In this paper, we present the results of a new approach to the splitting factor preconditioner, which is a preconditioner based on the Incomplete Cholesky factorization and the splitting preconditioner. In previous work for small linear programming problems, the preconditioner was applied in all iterations of the interior point method and compared w
Trends in Computational and Applied Mathematics. Publicado em: 2022
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2. Characterization, Source Apportionment and Health Risk Assessment of PM2.5 for a Rural Classroom in the Amazon: A Case Study
Classrooms are microenvironments in which children and teenagers may be exposed to fine particulate matter (PM2.5). Iranduba is a rural city in the Amazon region close to many brick kilns and road with high traffic levels. In this study, indoor and outdoor PM2.5 levels were measured in a classroom in Iranduba, and the PM2.5 exposure effects on student’s he
J. Braz. Chem. Soc.. Publicado em: 2021-02
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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. Solução do átomo de hidrogênio usando Supersimetria
Resumo Nesse trabalho apresentamos a solução da equação de Schrödinger através de uma versão moderna do método de fatorização usando o formalismo da chamada Mecânica Quântica Supersimétrica. O sistema tratado é o átomo de hidrogênio e tanto a parte radial como a angular das coordenadas esféricas são tratadas com a metodologia apresentada. E
Rev. Bras. Ensino Fís.. Publicado em: 19/06/2019
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5. USE OF CONTINUED ITERATION ON THE REDUCTION OF ITERATIONS OF THE INTERIOR POINT METHOD
ABSTRACT Interior point methods have been widely used to determine the solution of large-scale linear programming problems. The predictor-corrector method stands out among all variations of interior point methods due to its efficiency and fast convergence. In each iteration it is necessary to solve two linear systems to determine the predictor-corrector dire
Pesqui. Oper.. Publicado em: 2016-12
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6. 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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7. Composição elementar do aerossol atmosférico na região central da Bacia Amazônica
The processes and sources that regulate the elemental composition of aerosol particles were investigated in both fine and coarse modes during the dry and wet seasons. One hundred and nine samples were collected from the biological reserve Cuieiras - Manaus from February to October 2008, and analyzed together with 668 samples that were previously collected at
Quím. Nova. Publicado em: 2014-04
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8. Iteração continuada aplicada ao método de pontos interiores / Continued iteration applied to interior points method
Interior point methods have been widely used in the solution of large linear programming problems. The predictor corrector method, among ali interior point variants, is one of mostly used due to its efficiency and convergence properties. This method needs the solution of two linear systems to determine the predictor corrector direction, in each iteration. So
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/04/2012
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9. Marco figural como medio para factorizar polinomios cuadráticos
This article is a proposal for the teaching and learning of factoring quadratic polynomials, based Regine Douady´s theoretical frameworks regarding the Tool-Object Dialectic. It highlights the role of combined mathematical frameworks as a means to access... "different formulations of a problem which, without necessarily being equivalent, allow a new approac
Bolema. Publicado em: 2012-12
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10. Heuristics for implementation of a hybrid preconditioner for interior-point methods
This article presents improvements to the hybrid preconditioner previously developed for the solution through the conjugate gradient method of the linear systems which arise from interior-point methods. The hybrid preconditioner consists of combining two preconditioners: controlled Cholesky factorization and the splitting preconditioner used in different pha
Pesquisa Operacional. Publicado em: 2011-12
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11. Polinômios dominados entre espaços de Banach / Dominated polynomials between Banach spaces
O principal objetivo desta dissertação é estudar teoremas de dominação e de fatoração para polinômios homogêneos dominados entre espaços de Banach. Para isso primeiro estudam-se os polinômios homogêneos contínuos entre espaços de Banach, exibindo várias propriedades e exemplos. Posteriormente, volta-se o estudo para os polinômios homogêneos
Publicado em: 2011
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12. Avaliação do uso de diferentes modelos receptores com dados de PM2,5: balanço químico de massa (BQM) e fatoração de matriz positiva (FMP)
A identificação de fontes para material particulado tem sido um tema de crescente interesse em todo o mundo para auxiliar a gestão da qualidade do ar. Esta classe de estudos é convencionalmente baseada no uso de modelos receptores, que identificam e quantificam as fontes responsáveis a partir da concentração do contaminante no receptor. Existe uma var
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/03/2009