Yasar Levent Kocaga (2004)
We study the spare parts service system of a major semiconductor equipment manufacturer facing two kinds of orders of die rent criticality.
The more critical down orders need to be supplied immediately,
whereas the less critical maintenance orders allow a given demand lead time to be full led.
For this system,
we propose a policy that rations the maintenance orders.
Under a one-for-one replenishment policy with backordering and for Poisson demand arrivals for both classes,
we rest derive expressions for the service levels of both classes and then conduct a computational study to illustrate superior system performance compared to a system without rationing.
We also conduct a case study with 64 representative parts and show that sign cant savings are possible through incorporation of demand lead times and rationing.