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Operation Research in Computer Systems
Chon, Kilnam 한국경영과학회 1980 韓國經營科學會誌 Vol.5 No.2
Interface of operations research and computer system is explored. This paper attempts to explore operations research as a toll for computer system study. Several cases have been explored by the author. They are analysis of large scale computer networks, reliability study, automated operations and explore synergetic relationship of computer science and operations research.
전길남(Kilnam Chon) 한국정보과학회 1983 한국정보과학회 학술발표논문집 Vol.10 No.2
The status report on System Development Network (SDN) is presented. The SDN configuration has been changed, and multiple networks are being supported. Management structure is defined, and several technical development are presented much as the name server and the hangul mail.
김현철,이동만,Kilnam Chon,장백철,권태경,최양희 한국통신학회 2010 Journal of communications and networks Vol.12 No.1
Since large objects consume substantial resources, web proxy caching incurs a fundamental trade-off between performance (i.e., hit-ratio and latency) and overhead (i.e., resource usage),in terms of caching and relaying large objects to users. This paper investigates how and to what extent the current dedicatedserver based web proxy caching scheme is affected by large file transfers in a high bandwidth campus network environment. We use a series of trace-based performance analyses and profiling of various resource components in our experimental squid proxy cache server. Large file transfers often overwhelm our cache server. This causes a bottleneck in a web network, by saturating the network bandwidth of the cache server. Due to the requests for large objects, response times required for delivery of concurrently requested small objects increase, by a factor as high as a few million,in the worst cases. We argue that this cache bandwidth bottleneck problem is due to the fundamental limitations of the current centralized web proxy caching model that scales poorly when there are a limited amount of dedicated resources. This is a serious threat to the viability of the current web proxy caching model, particularly in a high bandwidth access network, since it leads to sporadic disconnections of the downstream access network from the global web network. We propose a peer-to-peer cooperative web caching scheme to address the cache bandwidth bottleneck problem. We show that it performs the task of caching and delivery of large objects in an efficient and cost-effective manner, without generating significant overheads for participating peers.
Hierarchical Session Management for Large Scale Sessions
Kyungran Kang,Kilnam Chon 한국정보과학회 1998 Journal of Electrical Engineering and Information Vol.3 No.5
Modern powerful computers connected by high-speed networks offer the opportunity to build interactive programs supporting collaboration. As result, the scale of such collaboration will increase dramatically like hundreds and thousands. Existing systems for multiparty sessions does not consider such a large number of participants. Centralized system will have the central management object overloaded with membership control functions and floor control functions. Distributed system will have the participants confused with uncontrolled manner of interactions. This paper suggests a way to lessen the load of the session manager by introducing hierarchical session structure. The participants are divided into multiple groups and each group has its own manager. The members' floor control requests are processed by its group manager. The group managers interact with the session manager to coordinate the interactions among the whole participants based on the session control policies. This paper describes the management components and the way to carry out the session management functions. The proposed approach will be compared with other large scale session approaches.