RETRACTION ARTICLE: Two-stage supply chain inventory management based on system dynamics model for reducing bullwhip effect of sulfur product

Abstract

Bullwhip effect is prevalent in supply chains, creating supply and inventory risks that affect marketing, supply and production. However, there are limited researches on the optimization of chemical supply chain inventory management. In order to solve the above problem, this paper took the sulfur product supply chain of a sulfur plant as an example, combined with the idea of system dynamics, and systematically studied the inventory control strategy in the distributor-retailer two-level inventory system constituted by the supply chain. Firstly, the causal loop diagram was drawn according to the system relationship between variables in the two-level supply chain, and then the system dynamics model of sulfur product supply chain was formed. Finally, problems existing in the supply chain were explored through simulation, and optimization suggestions were submitted. It can be concluded from the simulation results that there was bullwhip effect in the sulfur product supply chain, and the delay of transportation time and the change of inventory adjustment time would have an impact on the inventory level of each node enterprise in the supply chain. Therefore, the method of building an information sharing platform, implementing visual information management, and adopting logistics transportation service outsourcing could enhance the information exchange among node enterprises, so as to improve the operational efficiency of the entire product supply chain.

Joint Optimization of Maintenance and Spare Parts Inventory Strategies for Emergency Engineering Equipment Considering Demand Priorities

“…Based on the consideration of costly downtime due to the unavailability of spare parts, Dendauw et al [13] put forward a new policy with a condition-based critical level to regulate the stock level scientifically. Taking the sulfur product supply chain as an example, Zhou et al [14] conducted a detailed study on inventory control strategies for a two-stage inventory system. Considering the degradation of spare parts in inventory, Zhang et al [15] contributed to achieving the optimal control policy of the spare inventory for the involved system.…”