Abstract
A methodology for rescheduling a semiconductor fabrication line in the presence of predicted and unpredicted machine unreliability and job demand is presented. The proposed methodology consists of four major steps. (1) Representation of the fabrication line: the fabrication line is represented using a Neuro-Expert Petri net (NEPN) model. The entire fabrication line is decomposed into a ‘two machine and one buffer’ subsystem and represented using the NEPN model. (2) Estimation of failure and repair rates: the probabilistic machine failure and repair rates are determined using the method proposed by Jeong and Kim (Citation1998). (3) Activation of the rescheduling algorithm: the rescheduling algorithm is activated after the planned mean time to reschedule the fabrication line (