Optimization Under Uncertainty
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. Otimização de risco estrutural baseada em confiabilidade / Reliability-based structural risk optimization
In a competitive environment, structural systems must be designed considering not only their function, but also their total costs of construction and operation and their ability to generate profit. The costs are directly linked to the risk resulting from construction and operation of the structure. Risk is defined as the product of failure cost by failure pr
Publicado em: 2008
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14. OTIMIZAÇÃO SOB INCERTEZA DE CARTEIRAS DE INVESTIMENTOS: APLICAÇÃO À CADEIA INTEGRADA DE PETRÓLEO E DERIVADOS / OPTMIZATION UNDER UNCERTAINTY: AN INTEGRATED OIL CHAIN APPLICATION
Nos últimos anos, nota-se uma forte tendência no Brasil de oferta de petróleos cada vez mais pesados e ácidos em contraposição a uma crescente demanda de derivados mais leves dentro de especificações mais rígidas. Dessa forma, o Brasil se depara com a necessidade em adaptar suas refinarias e rede logística a esse novo perfil. Nesse contexto é impo
Publicado em: 2008
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15. MODELO DE PROGRAMAÇÃO ESTOCÁSTICA PARA O PLANEJAMENTO ESTRATÉGICO DA CADEIA INTEGRADA DE PETRÓLEO / A STOCHASTIC PROGRAMMING MODEL FOR THE STRATEGIC PLANNING OF THE OIL SUPPLY CHAIN
The oil industry is one of the most important and dynamic in Brazil. As the oil industry naturally integrated, we need an appropriate strategic planning to the oil supply chain that consider all its processes, such as oil production, refining, distribution and refined products marketing. Moreover, the oil industry is susceptible to various uncertainties rega
Publicado em: 2008
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16. PLANEJAMENTO EXPERIMENTAL E AVALIAÇÃO METROLÓGICA DA PRODUÇÃO DE LIPASES POR YARROWIA LIPOLYTICA / EXPERIMENTAL DESIGN AND METROLOGICAL EVALUATION OF LIPASE PRODUCTION BY YARROWIA LIPOLYTICA
Objective: Optimization of lipase production by Yarrowia lipolytica cells through experimental design and evaluation of metrological aspects related to process. Motivation: Although several published papers are found describing lipase production by microorganisms, few of them refer to process optimization through experimental design and none of them refer to
Publicado em: 2007
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17. ESTRATÉGIA DE CONTRATAÇÃO DAS DISTRIBUIDORAS EM LEILÕES DE ENERGIA SOB INCERTEZA NA DEMANDA / CONTRACTING STRATEGIES IN ENERGY AUCTIONS FOR DISTRIBUTION COMPANIES UNDER DEMAND UNCERTAINTY
The objective of this work is to analyze the new regulatory framework of the Brazilian electric sector. In this sense, it was developed a computational tool in order to elaborate strategies for the distribution companies (DISCOs) in the energy auctions instituted by the new regulation. The computational tool was used to simulate the contracts acquisition pro
Publicado em: 2006
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18. Compact representations of Markov decision processes and their application to printer management. / Representações compactas para processos de decisão de Markov e sua aplicação na adminsitração de impressoras.
Markov Decision Processes (MDPs) are an important tool for planning and optimization in environments under uncertainty. The specification and computational representation of the probability distributions underlying MDPs are central difficulties for their application. This work proposes two strategies for representation of probabilities in a compact and effic
Publicado em: 2006
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19. Câmbio e integração regional: flutuação conjunta e otimização dinâmica para o mercosul
The commercial and economic integration between Brazil and Argentina has been frequently put under risk and uncertainty, so in MERCOSUR, essentially manifested in the tariff compensation. Accounting this concern, one can investigate the importance of exchange in the integration process, the possibility of establishing an harmonic exchange management and its
Publicado em: 2006
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20. Seleção de portfolios de projetos de produção de petroleo por intermedio de tecnicas de otimização e curvas de isopreferencias / Portfolio selection of petroleum production projects using optimization techniques and indifference curves
The companies in the E&P business dedicate significant time and resources to decide the allocation of capital investment as a result of the large number of potential projects in their portfolios. The approach known as portfolio optimization aims to choose a subset ofprojects. The methodology used in order to achieve the portfolio optimization is based on max
Publicado em: 2005
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21. OPÇÕES REAIS HÍBRIDAS COM APLICAÇÕES EM PETRÓLEO / HYBRID REAL OPTIONS WITH PETROLEUM APPLICATIONS
This methodological and normative thesis extends the modern economic valuation theory of projects under uncertainty, known as real options theory, from the point of view of an oil company that optimizes the allocation of investment and resources. The real options theory is combined with other theories - so the name hybrid real options - in order to perform a
Publicado em: 2005
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22. Buckling optimization of arbitrary shape plates under uncertain loads.
Typically, aircraft wing structural panels are designed against buckling for a very large number of possible loading that may occur during the operation of the aircraft. If the optimization procedure accounts only for a limited number of design loads, the structure may be vulnerable to a specific type of loading that may cause the structure to fail. A novel
Publicado em: 2005
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23. OPTIMIZATION OF THE OPERATION UNDER UNCERTAINTY OF THERMAL PLANTS WITH FUEL CONTRACT WITH TAKE-OR-PAY CLAUSES / OTIMIZAÇÃO DA OPERAÇÃO SOB INCERTEZA DE USINAS TERMELÉTRICAS COM CONTRATOS DE COMBUSTÍVEL COM CLÁUSULAS DE TAKE-OR-PAY
O objetivo desta dissertação é desenvolver uma metodologia para determinar a estratégia ótima de despacho de usinas térmicas considerando as especificações do contrato de combustível e suas cláusulas de take-or-pay, as oportunidades de compra e venda de energia no mercado spot e as características da usina. Como as decisões de uma etapa têm impa
Publicado em: 2005
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24. At what wavelengths should we search for signals from extraterrestrial intelligence?
It has often been concluded that searches for extraterrestrial intelligence (SETI) should concentrate on attempts to receive signals in the microwave region, the argument being given that communication can occur there at minimum broadcasted power. Such a conclusion is shown to result only under a restricted set of assumptions. If generalized types of detecti