Abstract

In the petrochemical, chemical and pharmaceutical industries, supply chains generally consist of multiple phases of production facilities, inventory/distribution centers and customers. Supply chain staging in the face of various market and technical uncertainties is usually measured by service level, i.e., the expected fraction of demand that the supply chain can satisfy within a predefined allowable delivery time window. Safety stock is introduced into supply chains against uncertainty to provide customers with an assured service level. Although a higher safety stock level guarantees a better service level, it does increase the supply chain operating cost and thus these levels must be suitably optimized.

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