Browsing by Author "Jin, Hyun-Woong"
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- ItemAnalysis of Factors Affecting the Benefits of Demand Information Sharing(Technická Univerzita v Liberci, ) Jin, Hyun-Woong; Ekonomická fakultaSharing customer demand information across the supply chain is known to be an effective approach to improve the performance of the whole supply chain. However, demand information sharing between companies requires a large amount of budget and leads to a change in the work process within the organization. Therefore, it is necessary to verify whether the sharing of customer demand information is beneficial to the company or not by considering their business environment. This paper aims to analyze the benefits of demand information sharing between companies in various business environments in order to provide managerial implications for the companies considering the adoption of a collaborative inventory management policy with external companies. This research uses a simulation approach based on system dynamics to model the considered supply chain and to explore its performance. For the simulation test, two types of simulation models were developed which represent a supply chain without information sharing and a supply chain with information sharing. Test results were analyzed in terms of the bullwhip effect, the inventory level and the stockout rate of the retailer. The results of this research may help practitioners to understand the dynamics of supply chain when the customer demand is shared. These understandings could help them to make a decision on adopting a collaborative inventory management policy based on the demand information sharing. The originality of this paper is that it deals with various business environments which are rarely considered in the previous researches. These include the length of ordering cycle, the maximum size of ordering quantity, backlog versus lost sales and the type of information shared.
- ItemRestructuring parcel delivery network by considering dynamic customer demand(Technická Univerzita v Liberci, 2018-06-28) Jin, Hyun-Woong; Ekonomická fakultaParcel delivery service is one of the fastest growing industries in the world as the e-commerce such as online shopping mall expands rapidly. To increase its market share, most of parcel delivery service companies construct their delivery network as a form of hub-spoke network which is known to be efficient to deliver large scale products through widely spread area. In hub-spoke network, the number of hubs and their locations are important decision issues. Even though there are many researches on the hub-spoke network design, there is a lack of researches which deal with the fluctuating customer demand. Moreover, all the previous researches considering the fluctuating customer demand assumed that the capacity of hub facility is unlimited. Therefore, this research aims to propose the restructuring procedure of the parcel delivery network by considering the fluctuating customer demand with the capacitated hub facilities. In this research, utilization of temporary hubs is proposed so as to satisfy the fluctuating customer demand. Temporary hub responds to the excessive demands assigned to the permanent hubs and it is closed during the recession period to reduce its operating cost. A nonlinear integer programming model is constructed to decide the number of temporary hubs and their location at each time period. Since the complexity of the constructed mathematical model is NP-hard, GRASP based heuristic solution procedure is proposed. To evaluate the appropriateness of the proposed algorithm, experimental test with various demand sets considering four design factors are performed and the performance of the proposed algorithm is compared with the existing meta-heuristic algorithm. Test results show that the algorithm proposed in this research is more robust than the existing algorithm against the fluctuation of customer demand as well as it provides overall better results.