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김지표 서울産業大學校 2005 논문집 Vol.54 No.1
Internet bookstores are one of the first shopping malls appeared in Internet and the symbolic entity representing the e-commerce. Nowadays, e-commerce is prevalent and it is not unusual any more to see customers place an order at home on Internet. The Internet bookstore, however, struggles to attract customers and increase market shares as the book market enters upon recession. The price discount, currently a very controversial issue in the publishing industry, is the powerful weapon Internet bookstores heavily depend on in the competitive market. This paper empirically analyzes the price discount conditions among Internet bookstores to find out the effectiveness of the fixed price regulation and the extent of competition of Internet bookstores. The profitability of Internet bookstores is also investigated so as to evaluate the current price discount race.
AGV Operations for Cycle time-based Manufacturing Systems
김지표 한국SCM학회 2006 한국SCM학회지 Vol.6 No.1
The AGV system is part of a manufacturing system so that the relationship between them should be reviewed carefully before the parameters of AGV systems are determined. In this paper the AGV operation is analyzed in conjunction with a manufacturing system that has a cycle time for producing units. Because parts are to be processed in a constant rate, the production schedule including material movements can be projected easily and the facts can be exploited for running AGVs more effectively. First, empty vehicle travel time can be reduced dramatically because it would be scheduled to travel loaded until it reaches the final workstation once a vehicle departs from the beginning workstation with a part. Second, comparing the total vehicle travel time to the cycle time, an appropriate vehicle fleet size can be determined quickly. Also, the vehicle waiting time for drop-off or pickup of a part can be minimized and buffer space of workstations for input and output can be saved. Finally, All these features are demonstrated through simulations.