A Fuzzy Rule for Improving the Performance of Multiobjective Job Dispatching in a Wafer Fabrication Factory

Table 4

The nomenclature table.

Variable/parameter	Meaning
𝑡	The current time
𝑅𝑗	The release time of job 𝑗; 𝑗=1∼𝑛
CT𝑗	The cycle time of job 𝑗
CTE𝑗	The estimated cycle time of job 𝑗
RCT𝑗𝑢	The remaining cycle time of job 𝑗 from step 𝑢
RCTE𝑗𝑢	The estimated remaining cycle time of job 𝑗 from step 𝑢
RPT𝑗𝑢	The remaining processing time of job 𝑗 from step 𝑢
SCT𝑗𝑢	The step cycle time of job 𝑗 until step 𝑢
SK𝑗𝑢	The slack of job 𝑗 at step 𝑢
𝜆	Mean release rate
𝑥𝑗𝑝	The inputs to the three-layer FBPN of job 𝑗, 𝑝=1∼𝑃
ℎ𝑙	The output from hidden layer node 𝑙, 𝑙=1∼𝐿
𝑤^𝑜𝑙	The connection weight between hidden layer node 𝑙 and the output node
𝑤^ℎ𝑝𝑙	The connection weight between input node p and hidden layer node 𝑙, 𝑝=1∼𝑃; 𝑙=1∼𝐿
𝜃^ℎ𝑙	The threshold on hidden layer node 𝑙
𝜃^𝑜	The threshold on the output node