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order storage system aisle travel warehouse travel time number problem method research batch layout assignment picker model order picker travel distance koster design location journal distance batch size length /r machine throughput time conveyor dimension figure product class service throughput batching order pickers heuristic result storage assignment strategy route cycle production process section service time management machine distribution i /o point zoning policy example space capacity block pick-list simulation control operation retrieval solution pick-list size s-shape point return approximation literature tour length study period transaction storage locations order-picking customer function iie transactions production research probability le-duc
