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방송과 통신의 통합서비스를 위한 통신망 구조에 관한 연구
전용희,박수영 대구효성가톨릭대학교 응용과학연구소 1997 응용과학연구논문집 Vol.6 No.1
According to the development of information communications technology, the boundaries among broadcasting, communications and video industries are being blurred. Especially, the convergence of broadcasting and communications is expected to be accelerated in the near future because of their similarity in terms of technology. Therefore, it is in urgent request to devise the proper network architecture in order to provide efficiently the integrated services of broadcasting and communications. In this paper, we made an extensive study on the network architecture for the integration of broadcasting and communications services. The reference models for the access network architecture from the several worldwide standard bodies are analyzed. The progressive strategy for the migration from existing services to future services is also described.
주문형 비디오 시스템에서의 데이타 저장 및 디스크 스케줄링 기법
전용희,박은미 대구효성가톨릭대학교 응용과학연구소 1997 응용과학연구논문집 Vol.5 No.-
Generally speaking, I/O capability and storage requirements are more important than computing capability in a video system. The gap between processor performance and I/O system is expected to widen continuously. Therefore, the disk system typically becomes the bottleneck in a Video-On-Demand(VOD) system. Data storage in a VOD server is different from that of conventional file server in respect to the points that needs real-timeliness and requires large storage capacity. The conventional storage servers are not also geared to handle the demands of applications that deal with continuous media. In this paper, we made a survey of the placement methods for mutimedia data strage and presented a VOD data structure which can minimize the seek overheads in retrieval and maximize the throughput, thus may result in a substantial increase in the access efficiency for storage and retrieval. Using the data structure, we simulated the disk system in a VOD server and compared the performance of some disk scheduling schemes.
완전 결합형 ATM 스위치의 멀티캐스트 성능특성에 관한 연구
전용희,박정숙 대구효성가톨릭대학교 응용과학연구소 1997 응용과학연구논문집 Vol.5 No.-
In this paper, we studied on the multicast performance characteristics of fully-interconnected switch proposed by ETRI. It is the proper architecture for a small-sized switch element. The switch uses bit addressing method for addressing scheme and thus it is easy to implement multicast function without adding a function block. In B-ISDN(Broadband Integrated Services Digital Networks), the efficient implementation of multicase function is very important since the demand for distributed type of service is expected to grow. To incorporate the bursty nature of traffic in ATM networks, we used IBP(Interrupted Bernoulli Process) model as an input traffic model. We presented and analyzed the simulation results in terms of the multicast operation of the switch.