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Adaptation Latency and Throughput of TCP Congestion Control Schemes on Vertical Handoff
석우진,이길재,곽재승,김상하,Seok, Woo-Jin,Lee, Gil-Jae,Kwak, Jai-Seung,Kim, Sang-Ha The Korean Institute of Communications and Informa 2007 韓國通信學會論文誌 Vol.32 No.2B
이기종망간의 핸드오프 시, TCP는 새로운 망 환경에서 최적의 전송 CWND 값을 갖기까지 비효율적인 전송을 하게 된다. 본 논문에서는 이러한 전송상태에서의 SACK TCP와 BIC TCP의 성능과 이에 영향을 미치는 요소들을 분석하였다. 수치적 분석과 시뮬레이션 분석을 통하여, BIC TCP가 SACK TCP보다 훨씬 좋은 성능을 보여주었으며, RTT와 전송대역의 변화에 대해서도 좋은 성능을 보여 주었음을 알 수 있었다. Where a wireless LAN and a cellular network coexist, a mobile node has to experience vertical handoffs to move between them. Immediately after the vertical handoffs, TCP must need adaptation latency to adjust its congestion window to the proper size at a newly arrived network to use full of a new end-to-end available bandwidth. Even though SACK TCP has the best performance among other regular TCPs in the previous studies, it still cannot use full of the new available bandwidth quickly due to its inefficient increasing way of congestion window. BIC TCP, that becomes a popular TCP in long fat networks, has great feature working well against vertical handoffs by increasing congestion window exponentially with TCP connection sustained. In this paper, we derive adaptation latency of SACK TCP and BIC TCP numerically, and verify them by simulations. We also find that the shorter adaptation latency of BIC TCP produces higher throughput than SACK TCP on vertical handoffs. Consequently, to get higher performance on vertical handoff situations, we propose to use BIC TCP.
조진용,채종권,김종원,변옥환,곽재승,Jo, Jin-Yong,Chae, Jong-Kwon,Kim, Jong-Won,Byeon, Ok-Hwan,Kwak, Jai-Seung 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.1B
광 네트워크 기술의 발달로 인한 가용 대역폭의 증가는 고품질 협업환경 구축을 위한 비압축 인터넷 HDTV의 개발과 서비스를 촉진시키고 있다. 비압축 인터넷 HDTV는 고품질 갈무리 및 재생, 고성능 데이터 처리, 고속 전송 기술 등을 필요로 하는 첨단 광대역 응용이다. 하지만, 높은 장비 구축비용과 대용량 데이터의 전송을 위해 필요한 기가급 광대역 네트워크 요구는 비압축 인터넷 HDTV의 서비스 인프라를 확대하는데 있어 걸림돌로 작용하고 있다. 본 논문에서는 비압축 인터넷 HDTV 시스템의 저비용 구축을 위한 하드웨어 구성 및 시스템 구조를 제안하고 하드웨어의 제어와 데이터의 효과적인 전송 및 재생을 위해 개발된 소프트웨어를 소개한다. 개발 구축된 비압축 인터넷 HDTV 시스템의 성능 검증을 위해 연구망에 실험환경을 구축하고 종단 간 전송 및 재생 실험을 수행하여 효용성을 입증하였다. Recent advances in optical-network technologies have led to the advent of broadband networks reaching 10 Gbps. The increase of available network bandwidth envisions wide-spread use of broadband applications such as uncompressed Internet HDTV, which would be a cutting-edge application for networked collaborations. Despite of breakthroughs in high-performance systems and networks, expensiveness blocks wide-range deployments of uncompressed Internet HDTV systems. In this paper, we propose a low-cost uncompressed Internet HDTV system and discuss its software architecture in depth. We conducted several network-based experiments utilizing a research network test-bed to evaluate the performance of the proposed system.
원거리 대용량 데이터 전송을 위한 종단간 전송 성능향상에 대한 연구
석우진,권윤주,이길재,곽재승,Seok, Woo-Jin,Kwon, Yun-Ju,Lee, Gil-Jae,Kwak, Jai-Seung 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.6b
본 논문에서는 고속 데이터 전송을 요구하는 과학기술 어플리케이션들의 특성을 살펴보고, 이러한 어플리케이션들의 종단 간 성능향상을 위하여 필요한 요소로써, 디스크 액세스의 고속화, 전송 프로토콜의 고속화, 광 전용 회선 서비스를 제시하였다. 제시된 성능향상 요소를 만족시킨 테스트베드를 구성하고 성능을 측정하였으며, 한국과 미국 간 최대 4.7 Gbps 의 데이터 전송률을 보여주었다. In this paper, we investigate the features of scientific remote collaborative applications. The presented features are the high speed disk access, the high speed transportation protocol, and the dedicated light path, which are for the high performance of remote end-to-end collaboration. In the environment that satisfies the features, we achieve 4.7Gbps peak throughput between Korea and U.S.A.
운용가상경로와 대체가상경로의 동시 설정을 위한 공진화 알고리듬
김여근,곽재승 한국경영과학회 1998 한국경영과학회지 Vol.23 No.4
In ATM networks with high capacity, the effect of failures on transmission links or nodes can be catastrophic. so that the issue of survivability is of great importance. In this paper, we consider the routing problem for working and backup virtual paths(VPs). To accomplish a higher survivability, routing the two kinds of VPs should be taken into account at the same time because backup VP routing depends on the working VP routing. A coevolutionary algorithm is employed to solve the problem for simultaneously routing of working and backup VPs. To develop an efficient coevolutionary algorithm for the problem, structure of populations. encoding method. neighborhood, and genetic operators are studied in this paper. The results of extensive experiments are reported. The performance comparison of the proposed algorithm with a conventional genetic algorithm and existing heuristics shows that our approach is promising.
멀티캐스트 ATM망에서 대체가상경로의 설정을 위한 유전 알고리듬
김여근,송원섭,곽재승 한국경영과학회 2000 韓國經營科學會誌 Vol.25 No.2
Multicasting is the simultaneous transmission of data to multiple destinations. In multicast ATM networks, the effect of failures on transmission links or nodes can be catastrophic, so that the issue of survivability is of great importance. However, little attention has been paid to the problem of multicast restoration. This paper presents an efficient heuristic technique for routing backup virtual paths in multicast networks with link failure. Genetic algorithm is employed here as a heuristic. In the application of genetic algorithm to the problem, a new genetic encoding and decoding method, and genetic operators are proposed in this paper. The other several heuristics are also presented in order to assess the performance of the proposed algorithm. Experimental results demonstrate that our algorithm is a promising approach to solving the problem.