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Lee, Kisup,Kwon, In-Ki National Institute of Ecology 2021 국립생태원회보(PNIE) Vol.2 No.4
We investigated habitat use and home range of a rescued and released white-naped crane using GPS tracking technology in Cheorwon, South Korea, from October 2016 to March 2017. Four types of roosting sites were identified: frozen reservoirs, paddy fields, rivers, and wetlands. Upon arrival, the white-naped crane preferred wetlands in the Demilitarized Zone (DMZ). In late wintering season, it showed a tendency to change main roosting sites in the following order: rice paddies, rivers, and frozen reservoirs. Among 14 sleeping places, Civilian Control Zone (CCZ) with various type of available habitats was more preferred than the DMZ. Places outside of CCZ were rarely used due to anthropogenic disturbances during the night. The tracked white-naped crane widely chose daytime feeding sites while moving around all over rice paddies in the CCZ. Mean diurnal movement distance was 10.5 km with a maximum of 24.8 km. Its home range measured with Minimum Convex Polygon (MCP) and Kernel Density Estimation (KDE) was 172.30 km<sup>2</sup> with MCP, 159.60 km<sup>2</sup> with KDE 95%, 132.48 km<sup>2</sup> with KDE 90%, and 42.45 km<sup>2</sup> with KDE 50%. All estimated values of home ranges were higher in the early and later winter than those in the middle period.
Lee, Mu-Yeong,Kwon, In-Ki,Lee, Kisup,Choi, Sung Kyoung,Jeon, Hey Sook,Lee, Ji-Yeon,Eo, Kyung-yeon,Kim, Hwa-Jung,Kim, Jin-Han,Johnson, Warren E.,Yoo, Jeong-Chil,An, Junghwa Elsevier 2017 Biochemical systematics and ecology Vol.71 No.-
<P><B>Abstract</B></P> <P>The endangered Black-faced Spoonbill <I>Platalea minor</I> has experienced drastic reductions in population size, geographic distribution, and habitat availability throughout East Asia. In the present study, we examined population genetic structure and genetic diversity of Black-faced Spoonbills inhabiting five sites off the west coast of South Korea encompassing a few of its major breeding sites. Ten microsatellite loci and the mitochondrial sequence were used to assess patterns of genetic variation based on 63 individuals. Three ND2 haplotypes were found among 61 individuals; the remaining two were identified as Eurasian Spoonbills, revealing an unexpected hybridization between these two species having different ecological niches in South Korea—the Eurasian Spoonbill overwinters in inland areas, whereas the Black-faced Spoonbill inhabits coastal areas during the summer. Analyses of microsatellite variation revealed no discrete population structure among the five breeding sites but very weak genetic differentiation among geographically distant regions. Assignment tests identified several possible migrants among sites. Our findings suggested that Black-faced Spoonbills from the five breeding sites could be managed as a single population and highlighted the importance of conserving the populations from Maedo, Suhaam, and Namdong reservoir, which are geographically close and have retained high levels of genetic diversity and large populations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ten polymorphic microsatellite loci and the mitochondrial DNA sequence were used to assess genetic diversity and structure. </LI> <LI> No discrete population structure among the five breeding sites in South Korea but very weak genetic differentiation among geographically distant regions. </LI> <LI> Black-faced Spoonbill individuals from the five breeding sites could be managed as a single population in South Korea. </LI> <LI> Unexpected hybridization between the Eurasian Spoonbill and the Black-faced Spoonbill was observed in our genetic studies. </LI> </UL> </P>
Kisup Lee,Yong Chang Jang,Sunwook Hong,Jongmyoung Lee,In Ki Kwon 한국해양환경·에너지학회 2014 한국해양환경·에너지학회 학술대회논문집 Vol.2014 No.5
Disturbance on marine wildlife is one of the serious negative impacts of marine debris. In this study, the ratio of Black-faced Spoonbills" nests that includes plastic marine debris was surveyed in an islet. The ratio of Black-faced Spoonbills’ nests containing plastic marine debris decreased from 71% in 2011 to 37% in 2011 after natural materials were provided. The total number of nests increased from 28 in 2010 to 38 in 2011. We need to pay more conservation efforts to prevent further negative impacts.
무선 이동 웹 서비스를 위한 분산 프록시 시스템의 설계
김기섭(Kisup Kim),이혁준(Hyukjoon Lee),정광수(Kwangsue Chung) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.2Ⅲ
변환코딩 프록시 서버는 무선 이동 데이터 망을 통한 웹 검색 시의 응답지연을 줄이기 위하여 널리 채택되고 있는 방법 중 하나이다. 그러나, 프록시 서버로 네트워크 트래픽이 집중되는 병목현상과 프록시 서버의 동작 중단에 의한 전체 서비스의 중단이 이 방법의 최대 단점이다. 본 논문에서는 이러한 문제를 해결하기 위하여 분산 프록시 서버 시스템을 제안한다. 제안하는 시스템은 지역적으로 분산된 다수의 프록시 서버로 구성되어 있으며, 각 프록시 서버가 담당 지역 내 클라이언트들의 요청을 처리하도록 함으로써 작업량을 분담시킨다. 또한 클라이언트의 이동에 따른 프록시 서버간의 핸드오프를 지원하기 위한 새로운 프록시 서버 핸드오프 메시지 프로토콜을 제안한다.
모바일 센서 네트워크를 위한 트래픽 적응형 라우팅 프로토콜
홍기섭(Kisup Hong),이상훈(Sang Hoon Lee),최린(Lynn Choi) 한국정보과학회 2011 정보과학회 컴퓨팅의 실제 논문지 Vol.17 No.1
본 논문에서는 모바일 센서 네트워크(MSN: mobile sensor networks)에서의 트래픽 특성을 고려하여 제어 메시지를 최소화하고 노드의 이동성에 따른 빈번한 토폴로지 변화에 빠르게 대응할 수 있는 트래픽 적응형 라우팅(TAR: traffic adaptive routing) 프로토콜을 제안한다. AODV와 같이 MANET 환경에서 사용되는 기존의 라우팅 프로토콜들은 MSN 환경에서 사용될 수 있음에도 불구하고 불필요하게 많은 트래픽을 발생시킨다. TAR은 트래픽의 원인, 발생량, 패턴과 이동성을 분석하고 예측하여 이러한 오버헤드를 완화시킬 수 있으며, 동적인 토폴로지 변화에 빠르게 대응할 수 있는 경로 복구 알고리즘을 제공한다. TAR의 성능을 NS-2 시뮬레이터를 이용하여 AODV와 비교한 결과에 따르면 TAR은 제어 메시지 전송 수와 에너지 소비량을 최대 53% 절감하여 TAR이 기존의 MANET 라우팅 프로토콜보다 MSN 환경에 최적화 되어 있음을 확인 할 수 있다. In this paper we propose a traffic adaptive routing protocol called TAR for mobile sensor networks (MSNs) where any node can move any time. Although MANET routing protocols can be used for MSN they generate too much unnecessary traffic for low mobility environment and also by assuming peer-to-peer communication patterns. TAR can mitigate such overheads by analyzing and predicting the source, volume, and the patterns of the traffic as well as those of the mobility. TAR also provides fast route recovery to dynamic topology changes. We have implemented TAR in the NS-2 simulator. Our experimental evaluation confirms that TAR can improve both the network and energy performance by up to 53 percent for MSNs compared to the MANET routing protocols.