The relationship between rescheduling and safety stock – a study on production scheduling system in a hybrid flow shop

This paper deals with the problem of rescheduling in terms of safety stock, and changed quantity due to rescheduling in a two-stage hybrid flow shop. The first stage comprises one machine in lot production and second stage comprises a number J of machines in continuous production. Three kinds of rescheduling methods are considered: (1) change in sequencing of products to be produced while keeping the production quantity as planned, (2) change in production quantity, and (3) change in both sequencing and production quantity. Two cases are analyzed, that is, the rescheduling is conducted for only second stage and for both the first stage and second stage. This paper clarifies the impact of rescheduling system upon the manufacturing performance in a stochastic demand.