Vahid Sarhangian

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This paper deals with the problem of determining the optimal inspection strategy for a multi-stage production process using simulation optimization. An optimal inspection strategy is the one that results in the lowest total inspection cost, while still assuring a required output quality. Because of the complexity of the problem, simulation is used to model(More)
Red Blood Cell (RBC) transfusion is an integral part of many medical treatments and surgeries. Recently, a growing body of research suggests a correlation between the age of transfused blood and adverse clinical outcomes for its recipients. Therefore, there is a need for effective and practical inventory management policies which could reduce the age of(More)
BACKGROUND Although recent randomized controlled trials have not found increased risk of morbidity/mortality with older red blood cells (RBCs), several large trials will be completed soon providing power to detect smaller risks if indeed they exist. Hence, there may still be a need for inventory management policies that could reduce the age of transfused(More)
We study a first passage time problem for a class of spectrally positive Lévy processes. By considering the special case where the Lévy process is a compound Poisson process with negative drift, we obtain the Laplace-Stieltjes transform of the steady-state waiting time distribution of low-priority customers in a twoclass M/GI/1 queue operating under a(More)
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