Se-Jin Hwang

Korea University, Sŏul, Seoul, South Korea

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Publications (10)0 Total impact

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    Se-Jin Hwang, Myong-Soon Park
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    ABSTRACT: This paper proposes a feedback based rate control mechanism to achieve both smooth traffic and the high presentation quality of encoded video. We observed that the aggregated required bandwidth of uctuating consumption rate may be zero in time scale longer than negotiated at session establishment. We use such a notion in controlling rate. In our mechanism, optimism is found in that we do not make immediate response to high consumption rate. Traffic would not need to be changed by feedback if total aggregated bandwidth until next service round is smaller than the amount of resources negotiated at channel establishment. We show that rate control based on such an optimism guarantees acceptable QoS compared to previous mechanisms.
    Mobile Data Access, First International Conference, MDA'99, Hong Kong, China, December 16-17, 1999, Proceedings; 01/1999
  • 01/1999
  • 01/1999
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    ABSTRACT: Currently, many multimedia or continuous media server system is under development on top of either workstations or high-end PCs clustered with high speed networking facilities. In this paper we introduce Crown, a continuous media server on clustered high performance PCs with Myrinet, fast network switching equipment, and then address CrownFS, a file system on top of Crown, to offer continuous media streams to many subscribers at the same time. For easy and rapid tuning of the performance of CrownFS, we prototyped it. Prototyping requires less efforts and costs than direct implementation. Also, more reliable system optimization is obtainable rather than simulation. By using the prototype, we measured the scalability of CrownFS according to disk access strategies
    Information Networking, 1998. (ICOIN-12) Proceedings., Twelfth International Conference on; 02/1998
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    ABSTRACT: The explosive popularity of wireless data networking has been continued over the years. Furthermore, the strong requirement to access the Internet while on the move via mobile devices is growing more and more, since lots of useful resources are residing in the wired net, Internet. DataTAC manufactured by Motorola Inc. provides an infrastructure bridging Internet and mobile devices. On top of it, we built a middleware to make it possible for existing network software to surf on the Internet with a mobile device. The middleware provides such high application transparency that it does not need to be recompiled to adapt the middleware. We call that system Brown (Bridge over wireless net to Internet). In this paper, we introduce Brown, and then addresses the core technology, Vision (Virtual socket interfaces over wireless net), a communication layer to support multiple TCP/IP socket-based communication channels
    Information Networking, 1998. (ICOIN-12) Proceedings., Twelfth International Conference on; 02/1998
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    ABSTRACT: Caching and prefetching are well-known solutions to the problem of long latency in both wired and wireless networks. Caching is prevalently used to reduce round-trips and network traffic. The prefetching and uploading-prefetching data from fixed hosts on a wired network and uploading to mobile hosts-in the base station for the WWW has been proposed to solve those problems and has shown high performance improvement. The performance of prefetching in the base station can be improved when the base station has the caching information of mobile hosts. Cache-index forwarding can be used to let the base station see information of caching on mobile hosts. Here we propose a method named “CINDEX: Cache-Index Forwarding per Document for the WWW”, which sends the information of caching data on mobile hosts per document to the base station to eliminate unessential data prefetching and uploading
    Parallel and Distributed Systems, 1998. Proceedings., 1998 International Conference on; 01/1998
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    Se-Jin Hwang, Myong-Soon Park
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    ABSTRACT: In this paper, we propose a software data prefetching mechanism to insert prefetching instructions efficiently into a loop. Proposed mechanism analyzes the array reference pattern, and inserts prefetching instructions into the loop according to the results of the analysis. Analyzing the loop, it considers cache size and the number of array elements that will be used to exploit reuse property. However, in case that it is hard to benefit by the reuse due to the large number of array elements, proposed mechanism reorganizes the loop properly to reduce the overhead of reloading array elements that had been pushed out from the cache
    Computer Architectures for Machine Perception, 1995. Proceedings. CAMP '95; 10/1995
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    ABSTRACT: In this paper, we propose a software data prefetching mechanism to insert prefetching instructions efficiently into a loop. Proposed mechanism analyzes the array reference pattern, and inserts prefetching instructions into the loop according to the results of the analysis. Analyzing the loop, it considers cache size and the number of array elements that will be used to exploit reuse property. However, in case that it is hard to benefit by the reuse due to the large number of array elements, proposed mechanism reorganizes the loop properly to reduce the overhead of reloading array elements that had been pushed out from the cache.
    Proceedings of the Computer Architectures for Machine Perception; 09/1995
  • Se-Jin Hwang, Myong-Soon Park
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    ABSTRACT: In this paper, we propose a software data prefetching mechanism to cope with following two unfavorable phenomenons from large arrays. One is the failure of the reuse, and the other is the effect of the presence of unnecessary prefetching instructions. Also, we realized the proposed mechanism into a preprocessor, LOOP.
    Euro-Par '95 Parallel Processing, First International Euro-Par Conference, Stockholm, Sweden, August 29-31, 1995, Proceedings; 01/1995
  • Se-Jin Hwang, Jin-Uok Kim, Myong-Soon Park
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    ABSTRACT: The widespread acceptance of multimedia application has stimulated the develop-ment o f m ultimedia server and its system to guarantee the real-time require-ment o f c o n tinuous media streams. We designed and prototyped a continuous me-dia system on top of clustered workstations, called Crown(Clustered resources on workstations' network). Its system, CrownFS, guarantees glitch-less streams to many clients at the same time. We protototyped it to bottleneck points of Crown in advance of the implementation.