Continuous Optimization Methods
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. Tópicos em métodos ótimos para otimização convexa / Topics in optimal methods for convex optimization
Neste trabalho apresentamos um novo método ótimo para otimização de uma função convexa diferenciável sujeita a restrições convexas. Nosso método é baseado em ideias de Nesterov e Auslender e Teboulle. A proposta dos últimos autores usa uma distância de Bregman coerciva para garantir que os iterados permaneçam no interior do conjunto viável. No
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/03/2012
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2. Nova metodologia para análise de identificabilidade e estimação de parâmetros de modelos fenomenológicos
Model identification is the activity of constructing representative mathematical models of real systems. Several techniques are available for its completion, which depend on the level of information available about the studied system. In this work techniques for gray-box identification, which use both phenomenological models and experimental data, were studi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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3. Estabilidade e estabilização de uma classe de sistemas não-lineares sujeitos a saturação
This work addresses the problem of stability analysis and stabilization of nonlinear rational systems subject to saturation. The approach used in this study is based on the differential algebraic representation (DAR) of rational systems and on a modified version of the generalized sector condition to deal with saturation. First, methods to characterize the s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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4. Derivative-free methods for nonlinear programming with general lower-level constraints
Augmented Lagrangian methods for derivative-free continuous optimization with constraints are introduced in this paper. The algorithms inherit the convergence results obtained by Andreani, Birgin, Martínez and Schuverdt for the case in which analytic derivatives exist and are available. In particular, feasible limit points satisfy KKT conditions under the C
Comput. Appl. Math.. Publicado em: 2011
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5. Study and optimization of photocuring processes of composite resins to dental jobs. / Estudo e otimização da fotocura de resinas compostas de emprego odontológico
The aim of this study was to investigate the optimization of photo-cure of dental composite resin by combined curing methods. The curing was performed associating ultrasound and LED and LED with pre-heating composite resin. The irradiation performed was centered at 470 nm with power density of 600 mW/cm2 for the ultrasound and pre-heating association. The ap
Publicado em: 2010
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6. Aplicações de computação paralela em otimização contínua / Applications of parallel computing in continuous optimization
No presente trabalho, estudamos alguns conceitos relacionados ao desenvolvimento de programas paralelos, algumas formas de aplicar computação paralela em métodos de otimização contínua e dois métodos que envolvem o uso de otimização. O primeiro método que apresentamos, chamado PUMA (Pointwise Unconstrained Minimization Approach), recupera constante
Publicado em: 2008
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7. Estratégias de aplicações sequenciais e paralelas da metaheurística otimização por enxame de partículas ao problema do caixeiro viajante
Particle Swarm Optimization is a metaheuristic that arose in order to simulate the behavior of a number of birds in flight, with its random movement locally, but globally determined. This technique has been widely used to address non-liner continuous problems and yet little explored in discrete problems. This paper presents the operation of this metaheuristi
Publicado em: 2008
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8. Air conditioning control systems modelling using Petri nets. / Modelagem de sistema de controle de ar condicionado baseado em redes de Petri.
Among the trends of rational use of resources, especially energy, and the need to ensure productivity and quality in the implementation of productive activities, there is the concept of intelligent building. This environment materializes the concept of integrating building systems, powering the optimization of resources and the efficiency of human labor. In
Publicado em: 2008
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9. Monitoring fails in tubes using signals digital processing / Sistema de monitoramento de falhas em tubulações por meio de processamento digital de sinais
Natural gas has hazardous contaminants that, besides being corrosive, compromise the quality for the consumption. For in such a way the present residual water condensation in the gas can start a local corrosive process, which could cause damage to the structure of the gas ducts. Due to the great length of a gas duct, corrosive components decrease its quality
Publicado em: 2008
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10. Electrophoretic deposition of Ba(Ti0.85Zr0.15)O3 nanoparticles to fabrication of laser sintered ferroelectrics thick films / Deposição de nanopartículas de Ba(Ti0.85Zr0.15)O3 pela técnica de eletroforese para fabricação de filmes espessos ferroelétricos sinterizados a laser
The goals of this work were the implantation and optimization of the technique of sintering by laser scan of thick films, the kinetic study of the process and the evaluation of the physical properties of the laser sintered compound BaTi0.85Zr0.15O3 (BTZ), compared to thick films sintered in conventional furnace. Nanocrystalline powders of BTZ were for the fi
Publicado em: 2008
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11. DETERMINATION OF PLATINUM DERIVED FROM ANTI-CANCER DRUGS IN URINE SAMPLES BY ATOMIC ABSORPTION SPECTROMETRY / DETERMINAÇÃO DE PLATINA PROVENIENTE DE SUBSTÂNCIAS ANTINEOPLÁSICAS EM URINA POR GF AAS E HR-CS F AAS
Platinum coordination compounds have been used in cancer chemotherapy since the late 1960s. Cisplatin and carboplatin are the most common platinum based drugs used in cancer treatment. Pharmacokinetics investigations, the determination of the body burden during the treatment as well as the baseline levels of platinum in humans has attracted great interest. T
Publicado em: 2007
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12. Optimization procedures for establishing reserve networks for biodiversity conservation taking into account population genetic structure
Conservation genetics has been focused on the ecological and evolutionary persistence of targets (species or other intraspecific units), especially when dealing with narrow-ranged species, and no generalized solution regarding the problem of where to concentrate conservation efforts for multiple genetic targets has yet been achieved. Broadly distributed and
Genetics and Molecular Biology. Publicado em: 2006