http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
강경란(Kyungran Kang),전길남(Kilnam Chon) 한국정보과학회 1995 정보과학회논문지 Vol.22 No.8
호스트 그룹은 호스트들의 모임이다. 호스트 그룹 내의 호스트들은 각자 식별자를 갖지만, 하나의 호스트 그룹 주소를 통해 동시에 접근 가능하다. 호스트 그룹을 구현한 것으로 인터네트 프로토콜 멀티캐스트(Internet Protocol Multicast)가 있다. 그런데 이는 주소를 관리하는 매카니즘을 갖고 있지 않다. 이 논문에서는 관심을 갖는 문제점은 두 가지이다. 첫째, 다중 사용자 프로그램을 개발할 경우, 서로 다른 목적으로 운용되는 프로그램들이 동일한 주소를 사용하려고 하면 서로의 작업을 방해하게 되는 결과를 낳는다. 둘째, 인터네트 프로토콜 멀티캐스트에서는 메시지를 보낼 때 송신자가 수신 그룹에 속하는지 점검하지 않는다. 이로 인해서 고의든 실수든 외부에서 온 메시지에 의해 그룹의 작업이 망쳐질 수 있다. 위의 문제점을 해결하기 위해 ‘호스트 그룹 관리 시스템’을 설계하고 구현하였다. 이 시스템의 응용 프로그램으로 다중 사용자 응용 프로그램의 일종 공유 편집기(Shared Editor)를 만들었다. A host group is a set of hosts, which is identified by the group address. Each host of the group has the identifier but all of them can be accessed by the group address at the same time. Internet Protocol(IP) Multicast is an implementation of host group. It has no multicast address management mechanism. This paper concerns about two problems. First, there can be more than two different application groups which have the same host group address at a given time. Messages from a group may disrupt the operation of the other groups. Second, IP Multicast never checks whether the sender is the member of the receiver group. As a result, intentionally or by mistake, a message can interrupt the work of a group. To solve the above mentioned problems, we develop the host group management system. We show a sample application shared editor is built using the host group management library.
전장 환경에서 접촉 횟수 정보를 고려한 확률적 라우팅 기법
이종목,강경란,조영종,Lee, Jongmok,Kang, Kyungran,Cho, Young-Jong 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.3
The network nodes in a tactical network moves continuously and due to the physical and electronic obstacles, the connections are not always available. Due to the frequent disconnections, it is hard to discover the path among the nodes in a DTN. According to PROPHET(Probabilistic Routing Protocol using History of Encounters and Transitivity), one of the most well-known DTN routing protocols, a DTN node determines whom to forward a packet according to the packet delivery probability. From the viewpoint of a node, the packet delivery probability of another node is degraded while the nodes are disconnected whereas it is improved when they encounter. In this paper, we enhance the algorithm estimating the packet probability by considering the encounter count as an additional parameter. Our algorithm prefers the node that encounters the destination more frequently in selecting the next hop toward the destination. We evaluated the performance of our algorithm by simulating military operations using a DTN-dedicated simulator. Through the simulations, we show that our proposed algorithm achieve higher packet delivery ratio with similar overhead compared with PROPHET.
군 하이브리드 네트워크에서 생존성 향상을 위한 다중 경로 멀티캐스팅
방준호,조영종,강경란,Bang, June-Ho,Cho, Young-Jong,Kang, Kyungran 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.6
In this paper, we propose a multi-path construction scheme to improve the survivability of a multicast session in military hybrid networks. A military hybrid network consists of a static backbone network and multiple mobile stub networks where some nodes are frequently susceptible to be disconnected due to link failure and node mobility. To improve the survivability of multicast sessions, we propose a construction scheme of ${\kappa}$ redundant multi-paths to each receiver. In order to take account of different characteristics of static and mobile networks, we propose quite different multi-path setup approaches for the backbone and stub networks, respectively, and combine them at the boundary point called gateway. We prove that our proposed scheme ensures that each receiver of a multicast session has ${\kappa}$ redundant paths to the common source. Through simulations, we evaluate the performance of the proposed schemes from three aspects : network survivability, recovery cost, and end-to-end delay.