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질소원 처리에 따른 버드나무류의 생육초기 반응과 양분 흡수 특성
채승민,김미자,김선영,이창헌 한국환경복원기술학회 2020 한국환경복원기술학회지 Vol.23 No.3
The present study was to investigate the growth response and nutrient absorption in three willow species ( Salix gracilistyla , S. koreensis and S. chaenomeloides ) treated with nitrogen source (NH 4 + :NO 3 - rate; 200:0, 150:50, 100:100, 50:150, 200:0) for a period of 90days. The height, dry weight and chlor- ophyll contents of three species of willows were found to be highest at 50:150 (NH 4 + :NO 3 - ) treatment. NO 3 - -N was more effective than NH 4 + -N in the early growth of three species of willows. The increase in percentage of NO 3 - -N handling, T-N, NO 3 - -N in plant tissue increased. The analysis of C, N and mineral content in various parts revealed that the amounts of C, N, K, Ca and Mg were higher in leaves than those in the stems and the roots. However, the amount of NO 3 - -N and P were higher in roots than those in the leaves and the stems. Salix koreensis was excellent, followed by S. chaenome- loides and S. gracilistyla in absorption of nitrate nitrogen. Higher percentage of NO 3 - -N, the amounts of T-N, NO 3 - -N, P 2 O 5 , K, Na, Ca, and pH in soil were decreased.
Nested-PCR법과 Competitive PCR법을 이용한 뽕나무 오갈병(MD) Phytoplasma의 검출과 밀도변화
채승민 ( Seung Min Chae ),이솔 ( Sol Lee ),차병진 ( Byeong Jin Cha ),이혁인 ( Hyok In Lee ),한상섭 ( Sang Sub Han ) 한국산림과학회 2011 한국산림과학회지 Vol.100 No.4
The detectable levels and population fluctuations of phytoplasmas infecting dwarf mulberry trees were investigated using nested-PCR and competitive-PCR methods. Samples of five different types were studied : A. petiole of a leaf that displays dwarf symptoms, B. petiole from apparently healthy leaf residing on a branch also supports a leaf with dwarf symptoms, C. the branch portion that supports a leaf with dwarf symptoms, D. the leaf petiole from healthy appearing leaves on branch with no dwarf symptoms, and branch portion of branch with no dwarf symptoms, E. the rootlets of trees with dwarf symptoms. These 5-parts were collected from each tree during June - April, once in every two months. The phytoplasma was detected from all parts of collected mulberry samples during all seasons using nested-PCR with AS-1/AS-2 primer pairs. The phytoplasma was detected until 104 dilution using direct-PCR method, but it was detected until 1013 dilution by the nested-PCR method. The density of pytoplasma was found to be 7.94×1018-1012copies/μL in mulberry trees. The density of phytoplasma was observed throughout the year in all samples of mulberry trees. The highest rates of phytoplasma was found in the samples B and C during the early growing season followed by the sample A and D during the dormant season. Samples C and E displayed the highest phytoplasma density followed sample D. The density of phytoplasma appeared stable during all the seasons for samples C and A. The result of the present study demonstrates the utility of nested-PCR and competitive-PCR for detection and determination of population fluctuations of phytoplasmas in plant tissues.
[발표논문] RPCM: 모바일 기기를 이용한 원격 PC제어 에이전트시스템 설계 및 구현
채승민(Seung-Min Chae),김남호(Nam-Ho Kim) 한국지능정보시스템학회 2004 한국지능정보시스템학회 학술대회논문집 Vol.- No.-
RPCM(Remote Personal Computer Management)은 무선인터넷과 PC관리시스템의 결합이다. 모바일기기 사용자는 무선 웹 페이지에 접속하여 자신이 원하는 PC의 제어할 프로세스를 선택하여 제어범위를 선택한 후 제이시간을 설정함으로써 원거리상에 있는 PC를 제어할 수 있다. 또한 사용자의 시스템 사용내역을 모두 이력화하여 관리자에게 정형화된 통계데이터를 제공하며, 사용자에게는 패턴분석을 통해 지름길 경로를 만들어 패킷 데이터의 손실을 줄이고, 통신요금의 감소와 시간의 절약, 편의성 증대에 기여한다.