Stochastic Lead Time
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. STOCHASTIC DISCRETE LOT-SIZING WITH LEAD TIMES FOR FUEL SUPPLY OPTIMIZATION
ABSTRACT We address the problem of expected cost minimization of meeting the uncertain fuel demand during a time planning horizon, where supply is provided by selecting discrete shipments with lead times. Due to uncertainty and the passage of time, corrective actions can be taken such as cancellation and postponement on supply of shipments with associated co
Pesqui. Oper.. Publicado em: 09/05/2019
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2. HIGH-ORDER MULTIVARIATE MARKOV CHAIN APPLIED IN DOW JONES AND IBOVESPA INDEXES
ABSTRACT In this paper we analyzed the probabilities of transitions of state between Ibovespa and Dow Jones indexes using High-order Multivariate Markov Chain. While the stock market may be profitable, the existence of risks can lead to large losses. A mathematical model capable of considering different sources can aid in decision making. This model can work
Pesqui. Oper.. Publicado em: 09/05/2019
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3. AvaliaÃÃo do impacto de uma polÃtica de manutenÃÃo na performabilidade de sistemas de transferÃncia eletrÃnica de fundos
The transfer electronic funds systems (EFT) promote financial benefits to institutions that utilize this kind of service and conveniences for its clients. EFT systems realize credit and debit operations in bank accounts through points of sales terminals (POSs) in different companies. This way, analyzing the performance of the EFT systems has a fundamental im
Publicado em: 2009
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4. Modelagem matemática do efeito chicote em cadeias de abastecimento / Mathematical modeling of the Bullwhip Effect in supply chains
O aumento da variabilidade da demanda ao longo de uma cadeia de abastecimento é conhecido como Efeito Chicote (EC). A modelagem deste fenômeno é fundamental para a quantificação de sua intensidade, ajudando a reduzir seus impactos negativos sobre o nível de serviço e sobre os estoques em uma cadeia de abastecimento. Esta tese apresenta uma proposta de
Publicado em: 2007
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5. Contagio em mercados financeiros emergentes / Emerging financial markets contagion
The issue of contagion has been one of the most debated in the international finance literature in the last years. Although there is no general agreement regarding the definition of contagion, it is known that this issue is related to the fact that crisis started in one country tend to propagate to other countries. Therefore, a measure used as an indication
Publicado em: 2006
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6. Quantitative methods for management decisions in flight test campaigns for aeronautical certification.
Aircraft development process is characterized by high complexity and ever-decreasing lead times throughout for shortening time-to-market as an outcome.Development delays experienced in single systems, systems integration and the occurrence of design oscillations (design non compliances identified during flight tests that demand re-design and new test campaig
Publicado em: 2003
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7. Delay-induced stochastic oscillations in gene regulation
The small number of reactant molecules involved in gene regulation can lead to significant fluctuations in intracellular mRNA and protein concentrations, and there have been numerous recent studies devoted to the consequences of such noise at the regulatory level. Theoretical and computational work on stochastic gene expression has tended to focus on instant
National Academy of Sciences.
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8. Stochastic noise interferes coherently with a model biological clock and produces specific dynamic behaviour.
The influence of noise is unavoidable in all living systems. Its impact on a model of a biological clock, normally running in regular oscillating modes, is examined. It is shown that in a specific system in which endogenous rhythmicity is produced by a beat oscillator acting on a feedback coupled metabolic pool system, noise can act coherently to produce une
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9. Amplification of electromagnetic signals by ion channels.
Cells may respond to the exposure of low-frequency electromagnetic fields with changes in cell division, ion influx, chemical reaction rates, etc. The chain of events leading to such responses is difficult to study, mainly because of extremely small energies associated with low-frequency fields, usually much smaller than the thermal noise level. However, the
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10. Memory effects and oscillations in single-molecule kinetics
An exactly solvable model for single-molecule kinetics is suggested, based on the following assumptions: (i) A single molecule can exist in different chemical states and the random transitions from one chemical state to another can be described by a local master equation with time-dependent transition rates. (ii) Because of conformational and other intramole
The National Academy of Sciences.