1B1 ASSIGNMENT OF HUMAN OPERATORS TO MACHINE TOOLS AND SCHEDULING CONSIDERING STATISTICAL DISTRIBUTION OF PROCESSING TIMES(Technical Session 1B: Workforce Scheduling 1) :

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A new method is proposed, in this paper, to assign human operators to machine tools and to determine machining schedules considering statistical distributions of processing times. The proposed method consists of following three steps. The human operators are assigned to machine tools by using 0-1 integer programming, in order to minimize a total of standard deviations of processing times, in the first step. Some feasible machining schedules are determined for the individual machine tools by using a set of dispatching rules, in the second step. The statistical distributions of the makespans are calculated for the individual scheduling results by applying Clark's formula in order to select the machining schedule which minimizes the estimated maximum value of the makespan, in the third step.

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