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