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전용희,박정숙,전향희 대구효성가톨릭대학교 응용과학연구소 1998 응용과학연구논문집 Vol.6 No.2
In a VOD(Video-On-Demand) system, video data are generally stored on magnetic disk array system. In order to provide the real-time requirements for the data retrieval, video streams must be delivered continuously to the clients such that the delivery of continuous media can be guaranteed in a timely fashion. Video information is generally encoded as a VBR(Variable Bit Rae) stream based on the relevant MPEG standards. To access the VBR data in a VOD system, we may have two approaches: CTL(Constant Time Length) and CDL(Constant Data Length) access policies. In this paper, we examined and compared the performance of CDL and CTL data access policy is a little better than CDL policy in term of the maximum allowable video streams. However, it is believed that further studies ae required to design an efficient data access policy to be used under a real VOD environment.