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라우터 버퍼 관리 기반 체증 제어 방식의 최적화를 위한 자체 적응 알고리즘
홍석원(Sug Won Hong),유영석(Young Suk You) 한국정보처리학회 1999 정보처리학회논문지 Vol.6 No.11
Frame relay needs UPC function for the multiplexed logical connections to prevent malicious user traffic from incoming to network, to guarantee the QoS of conformed user traffic, and to protect the normal operation of network system. On the FR/ATM interworking in ATM networks, the UPC may be conducted either by cell based ATM UPC or frame-based FR UPC. Frames come into and traverse ATM networks by segmentation to ATM cells. Of course, FR QoS should be guaranteed in spite of segmentation and reassembly in ATM networks. In this paper, we compared the QoS of cell-based ATM UPC and frame-based FR UPC in terms of analysis and simulation in case of ingress of excess traffic over negotiated traffic parameters at user-to-network interface. Also we studied frame-based UPC schemes including window-based FR UPC and frame-based VSA which is an ATM UPC algorithm recommended by ITU-T. We described introductions to frame relay including frame structure and FR/ATM interworking. FR traffic parameters and their relationship, comparison of FR QoS between frame-based FR UPC and cell-based ATM UPC, comparison of FR UPC schemes, necessities of egress traffic control, and conclusions.
보호 스위칭에 의한 경로 설정에 있어서 서비스 보장을 위한 복구 경로의 소비 대역 분석
이황규,홍석원,Lee, Hwang-Kyu,Hong, Sug-Won 한국정보처리학회 2003 정보처리학회논문지 C : 정보통신,정보보안 Vol.10 No.2
빠른 복구 시간과 함께 서비스의 보장은 망의 신뢰성을 보장하는데 있어서 주요한 목표이다. 보호 스위칭 방식에 의하여 특정 서비스를 요구하는 세션의 서비스 품질을 보장하는 한 가지 방법은 작업 경로를 설정할 때 작업 경로의 대역을 보장하는 복구 경로를 함께 설정하는 것이다. 작업 경로의 대역을 보장할 수 있는 복구 경로를 설정할 때 다른 작업 경로에 대한 복구 경로의 대역을 서로 공유하면 대역의 소비를 감소시킬 수 있다. 본 논문에서는 보호 스위칭에 의한 복구 경로 설정에 있어서 작업 경로상에 최대로 할당된 링크의 대역을 기반으로 복구 경로의 공유 대역을 결정하는 방안을 설명한다. 그리고 이러한 단순 공유 방안의 문제점과 원인을 지적하고 이것을 실제망에 적용했을 때의 결과를 시뮬레이션을 통해서 보여준다. 그리고 이러한 문제점을 해결하기 위한 방안으로 링크 데이터베이스를 통한 완전 공유를 구현할 수 있는 방안을 제시하고 그 결과를 보여준다. Fast restoration time and service guarantee are the important goals to achieve the network reliability. In the protection switching scheme, one way to guarantee service fro an application session if a network happens to fail is to establish the restoration path that amounts to the same bandwidth of the working path of the session at the same time. When we setup the restoration path, we can reduce the bandwidth consumption by the restoration path if the path can share the bandwidth required by the other paths. This paper explains the methods how to determine the shared bandwidth of the restoration path in the protection switching scheme, given the maximum bandwidth assigned to a link along the working path. We point out that such sharing algorithm can not reduce the bandwidth consumption by the restoration paths in some cases, which contradict the general conception. We explain why this can happen, and show the simulation results in real network topologies to prove our arguments. We explain the reason of the failure of the sharing effect by the simple sharing algorithm. Finally we propose the way of how we can overcome the failure of the sharing effect, using the complete sharing algorithm based on the link database and showing the results.
배전자동화 시스템 통신망에 대한 사이버 공격에 대해 인증의 기법을 이용한 보안 알고리즘 적용방안
林一亨(Il-Hyung Lim),洪錫源(Sug-Won Hong),崔勉松(Myeon-Song Choi),李承宰(Seung-Jae Lee),林星日(Seong-Il Lim),李聖雨(Sung-Woo Lee),河福男(Bok-Nam Ha) 대한전기학회 2008 전기학회논문지 Vol.57 No.3
As communication is becoming increasingly prevalent and especially communication architecture is more relying on the open standard communication protocols, the security issues become major concerns. In this paper we consider possible cyber attacks in the applications based on the current distribution communication architecture, and then derive the security goals. Next we propose how the security algorithms can be adapted to achieve these security goals. We intend to adapt the most efficient ways of secure message exchange, taking the resource-constrained FRTUs into account Finally we show some experiments to validate the protocols.
배전자동화 시스템의 서비스 향상을 위한 P2P 기반의 분산형 통신망 구조
林一亨(Il Hyung Lim),洪錫源(Sug Won Hong),崔勉松(Myeon Song Choi),李承宰(Seung Jae Lee),河福男(Bok Nam Ha) 대한전기학회 2007 전기학회논문지 Vol.56 No.3
We overview the current distribution automation system in Korea and point out the limitations of the distribution services which can be provided by the current system. In this paper we propose a new distribution system architecture which is based on the peer-to-peer communication model. In this decentralized architecture the intelligent FRTUs can initiate data transmission without any interruption of a central server, and can exchange data with other FRTUs as peers. In order to support the peer-based distribution system, we specify the requirements for new communication network and suggest a way of improving the current distribution network where we adapt an intelligent module for protection and restoration, called MASX, and utilize the open communication network protocols. We also show how the new architecture can enhance major distribution services such as protection, automatic restoration, and equipment management.