Planning And Scheduling for Epitaxial Wafer Production Facilities
Planning And Scheduling for Epitaxial Wafer Production Facilities
Gabriel R Bitran
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As described in the previous section the five heuristics tested are i) (HI) Priority of group j is determined by the cardinality of the set I(j). In case of ties, the group with higher load will have a higher priority, ii) (H2) Priority is given by |I(j)| / d. Iii) (H3) Priority is given by S 1 ( j ) - j I < j ) | / g(j) iv) (H4) No priority among product groups, v) (H5) The two-phase heuristic for the make-span objective proposed in the previous section. In the first phase of this method the work load of the product groups is allocated to the reactors by solving the quadratic programming problem described earlier. We propose a reactor-based index for each data base to check for homogeneity in the products. This index measures the average load on each reactor and is defined as follows: RG(i) « E N(J) P(j) / |I(j)| JeJ(i) where N(j) ■ number of jobs in group j P(j) ■ mean process time for jobs in group j and I(j), J(i) are as defined earlier.
Each term in the summation represents the average load per reactor due to a group, assuming that the total load is uniformly distributed among all the reac- tors that can process such jobs.
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