Decision Under Uncertainty
Mostrando 25-36 de 38 artigos, teses e dissertações.
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25. 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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26. Risk assessment for reservoir development under uncertainty
Decision analysis applied to petroleum field development is always strongly related to risk due to the uncertainties present in the process. Methodologies to quantify the impact of uncertainties are still not well established due to the amount of variables that have to be considered. The complete analysis usually depends on geological, economical and technol
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2004-06
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27. ESTRATÉGIA MULTI-AGENTE PARA LEILÕES SIMULTÂNEOS DE BENS RELACIONADOS / A MULTI-AGENT SYSTEM FOR SIMULTANEOUS AND RELATED AUCTIONS
This work presents a multi-agent system to trade in simultaneous auctions of related goods. The dissertation describes the multi-agent architecture, and also the analysis and development of strategies for trading in simultaneous auctions, where the purchase of combined goods is required. Some well known problems in trading were identified in order to design
Publicado em: 2003
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28. Avaliação de modelos matemáticos desenvolvidos para auxiliar a tomada de decisão em sistemas de produção de ruminantes em pastagens. / Evaluation of mathematical models developed to aid decision-making in pasture-based ruminant production systems.
In agricultural systems, environment, soil, animals and plants are indissociable components of the production process. Furthermore, the production time-frame is relatively long. These characteristics enhance risk and uncertainty associated with decision alternatives made during the process. One tool which can aid in decision-making in these processes is the
Publicado em: 2003
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29. Interactive simulated annealing for solving imprecise discrete multiattribute problems under risk
We consider the multiattribute decision-making problem under risk with partial information of the decision-makers' preferences modelled through an imprecise vectorial utility function and where the consequences are assumed under uncertainty. In this framework under imprecision, we introduce the appropriate utility efficient set that plays a fundamental role
Pesquisa Operacional. Publicado em: 2002-12
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30. Analise e previsões de vasões utilizando modelos de series temporais, redes neurais e redes neurais nebulosas
Analysis and forecast of seasonal stream flow series are of utmost importance in the operation planning of water resources systems. One of the greatest difficulties in forecasting of those series is the seasonality nature of stream flow series due to wet and dry periods of the year. For a long time, the use of stochastic models, based on the c1assic Box &Jen
Publicado em: 2000
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31. Um sistema de apoio a decisão no planejamento da operação energetica de sistemas de energia eletrica
The present study has been deveIoped so as to obtain a Decision Support System (DSS) which integrates the work with the various Iong and medium term Energetic Operation PIanning (EOP) models, using a reIational database and user friendIy interfaces. The main eIement considered is the effective and interactive access to the information, be it about the modele
Publicado em: 1994
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32. Condicionantes socio-tecnicos da extrapolação (Scale-UP) de processos quimicos : estudo de caso: Projeto de Desenvolvimento do Processo de Produção de Silica Via Anidrido Carbonico no Centro de Pesquisas da Rhodia, Paulinia-SP
The extrapolation procedure (scale-up) is a labor process which alIows the change from a laboratory or pilot- scale or development to a fulIy blown scale of production, It is also a mechanism of selection for the equipment and general industrial operating conditions, whose accomplishment depends on social, poli ti cal and technical rules. The need for an emp
Publicado em: 1992
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33. Planejamento de expansão da geração com incerteza no mercado
This work presents a methodology to treat the uncertainty of the demand for electric energy process for the expansion of the Brazilian electric generation system. This methodology recognizcs the difficulty of assignin probabilities to lhe many sceneries used to forecast demand. As a consequence, no effort is made to quantify these probabilities and to use th
Publicado em: 1989
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34. A new decision sciences for complex systems
Models of complex systems can capture much useful information but can be difficult to apply to real-world decision-making because the type of information they contain is often inconsistent with that required for traditional decision analysis. New approaches, which use inductive reasoning over large ensembles of computational experiments, now make possible sy
National Academy of Sciences.
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35. Agent-based modeling as organizational and public policy simulators
Agent-based models are an increasingly powerful tool for simulating social systems because they can represent important phenomenon difficult to capture in other mathematical formalisms. But, agent-based models have provided only limited support for policy-making because their distinctive abilities are often most useful in situations where the future is unpre
National Academy of Sciences.
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36. Differential activation of the human orbital, mid-ventrolateral, and mid-dorsolateral prefrontal cortex during the processing of visual stimuli
There is considerable uncertainty about the precise functional contribution of the different parts of the prefrontal cortex to mnemonic processing. Changes in regional cerebral blood flow were measured with positron emission tomography in normal human subjects exposed to abstract visual designs under various conditions. It was demonstrated that the processin
National Academy of Sciences.