Dual Decomposition
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. An A Posteriori Error Estimator for a Non Homogeneous Dirichlet Problem Considering a Dual Mixed Formulation
ABSTRACT In this paper, we describe an a posteriori error analysis for a conforming dual mixed scheme of the Poisson problem with non homogeneous Dirichlet boundary condition. As a result, we obtain an a posteriori error estimator, which is proven to be reliable and locally efficient with respect to the usual norm on H d i v ; Ω × L 2 Ω. We remark t
Trends in Computational and Applied Mathematics. Publicado em: 2022
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2. Advances in Computed Tomography Evaluation of Skull Base Diseases
Introduction Computed tomography (CT) is a key component in the evaluation of skull base diseases. With its ability to clearly delineate the osseous anatomy, CT can provide not only important tips to diagnosis but also key information for surgical planning. Objectives The purpose of this article is to describe some of the main CT imaging features that c
Int. Arch. Otorhinolaryngol.. Publicado em: 2014
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3. AVALIAÇÃO DE TARIFAS DE ENERGIA ELÉTRICA ATRAVÉS DAS VARIÁVEIS DUAIS DE MODELOS LINEARES - SIMULADOR DE DECISÕES MULTI - CONCESSIONÁRIAS / EVALUATION OF ELECTRICITY RATES THROUGH THE DUAL VARIABLES MODEL LINEAR - SIMULATOR FOR MAKING MULTI - CONCESSIONAIRES
The decision taking in multidivisional organization structures makes an apropriated scenario to the use of metodologies of parallelized mathematical programming. Because the characteristics of certain structures of block-angular models with a large number of variables and constraints, its possible to handle them using parallel processing algorithms. The mono
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/04/2011
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4. Análise de imagem polarimétrica TerraSAR-X para classificação de uso e cobertura da terra na porção sudoeste da Amazônia Brasileira / TerraSAR-X image for classification the land use and land cover in the southwest portion of the Brazilian Amazon
The objective of this study is to analyze the potential use of images from satellite TerraSAR-X, at StripMap acquisition mode, to map and identify the land use and land cover (LULC) in the southwestern Brazilian Amazon. Classifiers based on statistical functions for maximum likelihood (ML) method and based on frequency-based contextual and neural network cla
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2011
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5. Influence of tempered microstructures on the transformation behaviour of cold deformed and intercritically annealed medium carbon low alloy steel
This research is focused on understanding the role of microstructural variables and processing parameters in obtaining optimised dual phase structures in medium carbon low alloy steels. Tempered Martensite structures produced at 300, 500, and 650 °C, were cold rolled to varied degrees ranging from 20 to 80% deformation. Intercritical annealing was then perf
Materials Research. Publicado em: 2010-06
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6. O metodo de geração de colunas aplicado a problemas de otimização em grafos / Column generation technique applied to graph optimization problems
In this thesis, two combinatorial optimization problems are modeled by integer linear programming and solved using the column generation technique. Both cases correspond to generalizations of classical problems in graphs that occur in many practical situations. The first, called capacitated ring-star problem is a generalization of the vehicle routing problem
Publicado em: 2009
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7. LOAD MAXIMIZATION TOOL FOR ELECTRIC SYSTEM FLUENT RESTORATION / FERRAMENTA PARA MAXIMIZAÇÃO DE CARGA NA FASE FLUENTE DE RECOMPOSIÇÃO DE SISTEMAS ELÉTRICOS
This work proposes a methodology to help the studies related to eletric power systems fluent restoration. At this early restoration stage, power system is structured in long transmission corridors and the reactors set definition is one of the adopted strategies for overvoltages disposal. The proposed tool, based on an optimization model, aims the network pro
Publicado em: 2008
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8. Relaxação langrangena com divisão em clusters para alguns problemas de otimização modelados em grafos de conflitos / Lagrangean relaxation with clusters for some optimization problems modeled by conflict graphs
Several combinatorial optimization problems can be modeled by a special graph denoted conflict graph. When these graphs are sparses well-adapted for a previous clustering phase, i.e, when they have clusters of vertices, the edges inter clusters can be relaxed in a lagrangean fashion, and the relaxed problem can be decomposed into sub problems and solved. Thi
Publicado em: 2007
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9. Synthesis of sol-gel aluminas : correlation of the textural, structural, morphological and chemical properties of aluminas with reactivity in the catalytic epoxidation of olefins / Sintese de aluminas sol-gel : correlação das propriedades texturais, estruturais, morfologicas e quimicas da alumina com a reatividade na epoxidação catalitica de olefinas
Epoxidation is a pivotal transformation for organic synthesis of fine and bulk chemicals. The aim of this research is the replacement of stoichiometric oxidative processes or non-environmental friendly catalytic processes by economically sustainable catalytic reactions of oxygen transfer using non-toxic catalysts and oxidants. The alumina/aqueous 70 wt. % H2
Publicado em: 2006
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10. Solving the unit commitment problem of hydropower plants via Lagrangian Relaxation and Sequential Quadratic Programming
We consider the optimal scheduling of hydropower plants in a hydrothermal interconnected system. This problem, of outmost importance for large-scale power systems with a high proportion of hydraulic generation, requires a detailed description of the so-called hydro unit production function. In our model, we relate the amount of generated hydropower to nonlin
Computational & Applied Mathematics. Publicado em: 2005-12
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11. REPRESENTATION OF MULTISTAGE STOCHASTIC PROBLEMS IN DECOMPOSITION: AN APPLICATION IN PLANNING OF THE EXPANTION OF ELECTRIC POWER SYSTEMS / REPRESENTAÇÃO DE PROBLEMAS ESTOCÁTICOS MULTI-ESTÁGIOS EM DECOMPOSIÇÃO: UMA APLICAÇÃO AO PLANEJAMENTO DA EXPANSÃO DE SISTEMAS DE ELÉTRICOS
The objective of this paper is to present a new methodology for the solution of hydrothermal systems expansion planning problems that takes into account uncertainties of future water inflows to the system reservoirs. The problem consists on the determination of a set of hydroeletric and thermoelectric plants that will be constructed in order to minimize the
Publicado em: 1994
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12. OPTIMIZATION OF MICROWAVE ROUTES BY THE DUAL DECOMPOSITION / OTIMIZAÇÃO DE ROTAS DE MICROONDAS POR DUALIZAÇÃO
The purpose of this work is to present a method for optimization of microwave routes in radio relay links, using decompositions techniques. The mathematical model is based on microwaves systems design criteria adopted in Brasil by the Empresa Brasileira de Telecomunicações S.A., EMBRATEL, and consists of a nonlinear objective function, several inequalities
Publicado em: 1983