Design of a Multiobjective Reverse Logistics Network Considering the Cost and Service Level

Table 2

Parameters of the model.

Parameter	Index	Value
Annual renting cost of the collection points	𝑎	200
Handling cost per unit product	ℎ	0.1
Capacity of a repair centre	𝑚𝑘	2000
Minimum number of open collection points	cp	5
Minimum number of established repair centres	rc	1
Average working hours to repair a returned product	𝑡𝑚	10
	𝛼1	0.8
Discount rate with respect to the shipping volume	𝛼2	0.6
	𝑝1	200 units
	𝑝2	400 units
	𝛽1	1.1
Penalty rate with respect to the shipping distance	𝛽2	1.2
	𝑞1	25
	𝑞2	60
Working days per year	𝑤	250
Cost of establishing a repair centre	𝑒𝑘	3000
Service coverage	𝑙	25
Unit standard transportation cost	𝐸	1
Expected cycle time	𝑡𝑒	30