Solução de problemas inversos de transferência radiativa em meios heterogêneos unidimensionais e uma e duas camadas utilizando o algoritmo dos vagalumes

• Autor(a) principal: Cirino, Rubens Luiz
• Data de Publicação: 2014
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/13676
• topic: Radiative transfer; Inverse problems; Stochastic methods; Firefly algorithm; Metaheuristics; Otimização combinatória; Radiação Transferência; Problemas inversos (Equações diferenciais); Processo estocástico; Algoritmos; Programação heuristica; Programação evolutiva (Computação); Algoritmo dos vagalumes; Métodos estocásticos; CNPQ::CIENCIAS EXATAS E DA TERRA::CIENCIA DA COMPUTACAO::MATEMATICA DA COMPUTACAO

This thesis presents a study on computational modeling where optimization metaheuristics are applied to the solution of inverse radiative transfer problems in heterogeneous media: in one-layer media with space-dependent single scattering albedo, and two-layer media, where the inverse problem is formulated as an optimization problem. It is applied a metaheuristic based on the natural behavior of fireflies, known as the firefly algorithm. Initially, comparative studies of performance were made with two other classic stochastic algorithms. The results indicated that the choice of the firefly algorithm was appropriate. Then, it was proposed other strategies that have been inserted into the original firefly algorithm. A first case was proposed where all the strategies were investigated and tested. The strategies with the best results were investigated in other two different cases. All the three proposed cases involved one-layer media with space-dependent scattering albedo. The strategies have been tested and evaluated, and those which presented the best competitive results were then implemented for radiative problems in two-layer media. For this new scenario five test cases were investigated, and the results obtained with the new strategies developed in this work were critically analyzed.