Table 1: Definitions of parameters and variables.

: inventory adjustment time : demand smooth time
: production delay time : estimated value of production delay time
CON: demand rateACON: demand rate after forecast
ORT: production rateCRT: production fulfillment rate
TINV: target inventory levelINV: actual inventory level
EINV: inventory deviationWIP: work-in-process
TWIP: target work-in-
EWIP: work-in-process deviation