Joint Optimization of Item and Pod Storage Assignment Problems with Picking Aisles’ Workload Balance in Robotic Mobile Fulfillment Systems

Table 1

Summary of the literature on SAP at the strategic level of RMFS.

Research problem	Objective function	Picking aisles’ workload balance	Literature
ISAP	Maximize the items’ relevances	×	Xiang et al. [7]
	Maximize the items’ relevances	×	Guan and Li [24]
	Maximize the items’ relevances	×	Kim et al. [23]
	Minimize robots’ movement distance	×	Mirzaei et al. [25]
	Maximize the items’ relevances and minimize pickers’ energy expenditure	×	Zhang et al. [3]
PSAP	Minimize robots’ movement distance	√	Wang et al. [10]
	Minimize robots’ movement cost	×	Keung et al. [26]
Two-stage optimization of ISAP and PSAP	ISAP: Maximize the items’ relevances	√	Li et al. [30]
	PSAP: Minimize robots’ movement distance
	ISAP: Maximize the items’ relevances	√	Yuan et al. [9]
	PSAP: Minimize robots’ movement distance
Joint optimization of ISAP and PSAP	Minimize robots’ movement distance	√	This article