Research Article
A Two-Stage Path Planning Method for the Rearrangement Problem in Modular Puzzle-Based Storage System
| Symbol | Definition |
| | An order of a picking module, indicating a target state of the picking module. | | Length of the order. | | Current state of the picking module, where is the type of item in slot j. | | A set of subsequences composed of i serial numbers taken from Q. | | A subsequence composed of i serial numbers taken from Q. | | A set of subsequence composed of i serial numbers taken from | | A subsequence composed of i serial numbers selected from | | A matched group determined only by and . | | The number of matched items, which is also the length of or . | | A set of matched groups. |
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