Recently, [9] proposed a non-traditional aisle design for unit-load warehouse for one, centrally located pickup and deposit (P&D) point both on the lower and upper sides of warehouse. We call this design Leverage. However, the number of P&D points is limited to one in design Leverage. Hence, in this research, we investigate the changes in improvement of Leverage as the number of P&D points increases by searching optimal designs by using [9]'s approach. We then compare Leverage with the improved designs to investigate its robustness in terms of changes in aisle structure and cost.
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