Research Article
Joint Optimization of Item and Pod Storage Assignment Problems with Picking Aisles’ Workload Balance in Robotic Mobile Fulfillment Systems
Table 2
The notations used in the J-IPSAP.
| Parameters | Meaning | Value |
| | Set of items | | | Set of pods | | | Set of pod layers | | | Set of orders | | | Set of pod locations | | | Set of picking aisles | () | | The value of the threshold weight coefficient | | | The number of orders to purchase item | | | The number of orders to purchase both items and | | | The purchase frequency of item | = | | If order contains item , it equals 1, otherwise, it equals 0 | | | If location is in aisle , it equals 1, otherwise, it equals 0 | | | The number of storage locations of item | | | The relevance coefficient of items and , when = , = 0, otherwise = / | | | The distance from location to the picking station | |
|
|