New Scheduling Approach for Shared Resources and Mixed Storage Policies

P. CASTRO; L.J. ZEBALLOS; C.A. MÉNDEZ

Computer-Aided Chemical Engineering,29

elsevier

Lugar: Amsterdam; Año: 2011; p. 975 - 979

We propose a new mixed-integer linear programming (MILP) model for schedulingautomated wet-etching stations (AWS), which can be classified as a multistage batchplant with both zero-wait and local storage policies and featuring a robot for moving thewafer lots from one stage to the next. The novelty is the use of a slot-based approach forhandling the processing tasks together with general precedence sequencing variables fordealing with the transportation tasks. The performance of the new continuous-timemodel is shown to be significantly better than a pure sequencing based formulation anda closely related hybrid model taken from the literature.