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성수련 ( Su Lyun Sung ),강정호 ( Jung Ho Kang ),신용태 ( Yong Tae Shin ) 한국정보처리학회 2004 정보처리학회논문지 C : 정보통신,정보보안 Vol.11 No.4
This paper presents an efficient interoperation scheme of a VPN(Virtual Private Network) and Mobile IP using a hierarchical structure of a FA(Foreign Agent). In the proposed scheme, the GFA(Gateway Foreign Agent) plays a role of VPN gateway on behalf of the MN(Mobile Node). When the MN moves in the same GFA domain, because the GFA has already an IPsec security association with a VPN gateway in the home network of the MN, the MN does not need an IPsec re-negotiaion. In this way, our mechanism reduces a message overhead and a delay resulted from an IPsec negotiation. And a MN can send a data to a correspondent node without a packet leakage. We show a performance of our scheme by using a discrete analytical model. Analytical results demonstrated that the total processing cost calculated by a registration update cost and a packet delivery cost is significantly reduced through our proposed scheme.
Testing Capability of CME Eccentricity Parameter
Rho, Su-Lyun,Cho, Kyung-Suk,Chang, Heon-Young,Moon, Yong-Jae,Kim, Rok-Soon,Park, Young-Deuk 한국우주과학회 2009 한국우주과학회보 Vol.18 No.2
Rho et al.(2008) showed that the eccentricity parameter of a CME is an important indicator for forecasting CME geoeffectiveness. In this study we have tested a capability of the eccentricity parameter as an indicator of CME direction. For this work we con
이동 환경에서 효율적으로 신뢰적인 멀티캐스트 지원 방안
성수련(Su Lyun Sung),권순홍(Soon Hong Kwon),신용태(Yong Tae Shin) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅲ
In this paper, we present a scheme for the improving reliable transport and the efficient multicast support in mobile environment. The proposed scheme solves a problem of TCP layer resulted from mobility by using a Representative FA. RFA has a mechanism like a snoop module which has a cache and can provide retransmission of a multicast packet lost and solve the ack implosion problem. Also, we present an additional IGMP message. By using it, We can remove a delay for IGMP query cycle and serve a multicast service more promptly.
펄스파를 주입한 DC Passive 회로에서의 반응 특성
박민수(Min-Su Park),김정훈(Jung-Hoon Kim),장수형(Su-Hyeong Jang),유련(Lyun Yu),안길영(Kil-Young Ahn) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.5
LVDC시스템은 전식 및 안전문제로 인하여 비접지방식을 사용한다. 비접지방식의 지락검출은 AC계통에서는 GPT를 사용하지만 DC계통에서는 GPT를 사용할 수 없으므로 활선상태에서 절연저항을 측정할 수 있는 절연감시 장치가 대안으로 사용될 수 있다. 절연감시장치는 신호를 인가하여 절연저항을 측정하므로 LVDC시스템에 펄스 주입형 절연감시장치가 설치되었을 때의 선로의 영향을 PSCAD/EMTDC를 이용하여 확인한다.