Abstract
In a manufacturing system, efficient production is often disturbed by unexpected events such as interruption of urgent jobs and failures of machines, which cause some delay in the production process. In such cases, execution of rescheduling could partially or completely recover the delay. POP (point of production) systems, which can detect any delay occurring in the production process in real time are becoming popular. On the basis of the information obtained using a POP system, the present study proposes a policy for the rescheduling of planning and provides a formulation for optimal planning. The policy proposed in this study is to conduct rescheduling when the number of problems causing delay in the production process beaches a prespecified value. The conditions under which an optimal solution exists are also clarified. Numerical examples are presented to indicate the characteristics of the proposed method.
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