Dates sometimes undergo a yeast fermentation even though they appear to be sufficiently low in moisture and high in sugar content to inhibit the development of most spoilage organisms. In the packing of dates the procedures followed, as outlined by Sievers and Barger (1930) do not involve the use of preservatives or of sufficient heat to prevent yeast growth. In fact, yeast spoilage has been ob...

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This paper reconsiders the PERT scheduling problem when information about task duration is incomplete. We model uncertainty on task durations by intervals. With this problem formulation, our goal is to assert possible and necessary criticality of the different tasks and to compute their possible earliest starting dates, latest starting dates and floats. This paper puts together various results ...

We consider a stochastic scheduling problem with impatience to the end of service or impatience to the beginning of service. The impatience of a job can be seen as a stochastic due date. Processing times and due dates are random variables. Jobs are processed on a single machine with the objective to minimize the expected weighted number of tardy jobs in the class of static list scheduling polic...