Solving Fuzzy Multiproduct Aggregate Production Planning Problems Based on Extension Principle

Table 1

Notation for decision variables of the fuzzy APP model.

Decision variable	Definition
𝑃^𝑛𝑟𝑡	Regular-time production of 𝑛th product in period 𝑡 (units)
𝑃^𝑛𝑜𝑡	Overtime production of 𝑛th product in period 𝑡 (units)
𝑊^𝑛𝑡	Workforce level of 𝑛th product in period 𝑡 (man-day)
𝐼^𝑛𝑡	Inventory level of 𝑛th product in period 𝑡 (units)
𝐵^𝑛𝑡	Backorder level of 𝑛th product in period 𝑡 (units)
𝐻^𝑛𝑡	Worker hired of 𝑛th product in period 𝑡 (man-day)
𝐿^𝑛𝑡	Worker layoff of 𝑛th product in period 𝑡 (man-day)