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Moreover, the workload balance in each picking aisle needs to be considered in the storage assignment problems to avoid robots\u2019 congestion within picking aisles. Motivated by these, the joint optimization of item and pod storage assignment problems (J-IPSAP) with picking aisles\u2019 workload balance is studied. The mixed integer programming model of the J-IPSAP with the workload balance constraint is formulated to minimize the robots\u2019 movement distance. The improved genetic algorithm (IGA) with the decentralized pod storage assignment strategy is designed to solve the J-IPSAP model. The experimental results show that the IGA can obtain high-quality solutions when compared with Gurobi and the two-stage heuristic algorithms. The robots\u2019 movement distance is smallest when the width-to-length ratio of the storage area is close to 1, and the robots\u2019 movement distance will increase with more stringent workload balance constraints.<\/jats:p>","DOI":"10.1155\/2024\/9260431","type":"journal-article","created":{"date-parts":[[2024,1,5]],"date-time":"2024-01-05T21:05:08Z","timestamp":1704488708000},"page":"1-15","source":"Crossref","is-referenced-by-count":4,"title":["Joint Optimization of Item and Pod Storage Assignment Problems with Picking Aisles\u2019 Workload Balance in Robotic Mobile Fulfillment Systems"],"prefix":"10.1155","volume":"2024","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0337-7079","authenticated-orcid":true,"given":"Jun","family":"Zhang","sequence":"first","affiliation":[{"name":"School of Information Management, Central China Normal University, Wuhan, China"},{"name":"E-Commerce Research Center of Hubei Province, Central China Normal University, Wuhan, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5508-8690","authenticated-orcid":true,"given":"Lingkun","family":"Tian","sequence":"additional","affiliation":[{"name":"School of Information Management, Central China Normal University, Wuhan, China"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-9836-2386","authenticated-orcid":true,"given":"Zijuan","family":"Zhou","sequence":"additional","affiliation":[{"name":"School of Information Management, Central China Normal University, Wuhan, China"}]}],"member":"311","reference":[{"key":"1","article-title":"Robots in the warehouse: it\u2019s not just amazon","author":"S. 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