Research Article
Joint Optimization of Item and Pod Storage Assignment Problems with Picking Aisles’ Workload Balance in Robotic Mobile Fulfillment Systems
Table 3
The decision variables used in the J-IPSAP.
| | Decision variables | Meaning | Value |
| | If item is on layer of pod , it equals 1; otherwise, it equals 0 | | | If order is fulfilled by pod , and is on pod , it equals 1; otherwise, it equals 0 | | | If order is fulfilled by pod , it equals 1; otherwise, it equals 0 | | | If pod is assigned to location , it equals 1, otherwise, it equals 0 | | | The number of layers of pod with item | | | If the order is fulfilled by pod , and pod is allocated to location , it equals 1; otherwise, it equals 0 | |
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