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CEPA 처리가 옻나무의 칠액분비 및 수피생리에 미치는 영향
최태봉(Tae Bong Choi),김만조(Mahn Jo Kim),현정오(Jung Oh Hyun) 한국산림과학회 2000 한국산림과학회지 Vol.89 No.1
This study was conducted to investigate the effects of CEPA(2-chloroethyl phosphonic acid) on bark physiology and anatomy of lactree(Rhus verniciflua Stokes). Sample trees of similar size and growth rate were selected from 7-year-old lactree plantation located in Hyengsung-kun, Kangwon-do. Lanolin pastes containing 0.1, 1, or 10% CEPA were put into the bark-removed hole made by corer(ø1㎝) on the main stem at 1.2m above the ground on June 16, 1995. Five weeks after application of CEPA, bark thickness was markedly increased as a result of the increase in the amount of phloem and intercellular spaces, and correlated with the increased production of urushiol. By the application of 10% CEPA, bark thickness was increased approximately 2.5 times, and the urushiol content within bark was increased 2.8 times compared to that of untreated trees because CEPA stimulated the accumulation of urushiol within bark. Treatment of 10% CEPA also increased the size and the total number of secretory canals, and induced an increase in ray width. The phloem parenchyma cells of CEPA-treated trees were well-developed and closely packed with little intercellular space.
김주현 ( Ju-hyun Kim ),최태봉 ( Tae-bong Choi ),강길재 ( Kil-jae Kang ),김한동 ( Han-dong Kim ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.2
미래 육군의 대대급이하 NCW 핵심은 기반통신장비인 TMMR(Tactical Multi Function Terminal)과 전투지휘를 위한 전장단말기인 대대급이하 전투지휘체계(B2CS)로 대표할 수 있다. 이중 TMMR은 음성과 데이터 통신이 가능토록 개발중인 무전기이다. 하지만, 군 무전기 특성상 은·엄폐 지역에서의 통신 보장을 위해 낮은 주파수 대역을 사용함에 따라 최대 지원 가능한 전송속도는 매우 한정적이다. 따라서 TMMR을 기반 통신장비로 활용하는 B2CS는 이 낮은 대역폭을 어떻게 효율적으로 사용할 것인가가 핵심이다. 따라서 본고에서는 이를 위해 군 운용환경에서의 TMMR 기반하 B2CS 운용 시 필요한 TMMR의 요구대역폭을 분석, 데이터 경량화 설계가 필요함을 확인하고, 이에 따른 B2CS에서 적용하고 있는 데이터 경량화 설계 방안을 제시하고자 한다.
Yong Yul Kim(金龍律),Jung Oh Hyun(玄正悟),Kyung Nak Hong(洪庚洛),Tae Bong Choi(崔太鳳),Kyu Sick Kim(金奎植) 한국육종학회 1995 한국육종학회지 Vol.27 No.1
This study was conducted to investigate the genetic structure and the degree of genetic differentiation in the natural populations of Pinus densiflora in Korea based on RAPD analysis. Ten natural populations were selected to study and seventeen to thirty-one trees were sampled from each population. Total DNAs extracted from megagametophyte tissues of seven seeds per tree were used as template DNAs for genotyping of the seed tree. Of the twenty primers screened, three primers which reveal polymorphisms were chosen and used to score for the frequency of band types. From the segregation tests using the frequencies of RAPD band types of 40 seeds, 30 bands were confirmed to be diallelic loci and one band was a monomorphic locus. High levels of genetic variation were found in expected heterozygosity (0.395) and percentage of polymorphic loci(95.2%). The value of FIS and FIT was -0.353 and -0.177 respectively, indicating that trees of Pinus densiflora in natural population may suffer from a marked inbreeding depression. The value of FST and GST, a measure of genetic differentiation among population, was 0.130 and 0.129 respectively. This means that the percentage of genetic variation present in the population due to among population differentiation was about 13%, which was much higher value compared to those of other isozyme studies of Pinus densiflora. The number of migrant(Nm) between population per generation was estimated as 1.667. This value indicates a significant migration taking place between populations of the species through a long distance of pollen dispersion. However, it is not in agreement with the implication made from the FST, and GST values estimated in this study. The mean value of Nei’s genetic distances among ten population was 0.095 indicating differentiation among populations. The dendrogram produced by the UPGMA clustering method indicated some geographic patterning. The ten populations could be classified into 2 groups. Group I included populations of Cheju, Uljin, Hongchon, Undu, Poun and Mungyong, while group Ⅱ included populations of Inje, Chiri, Wibong and Yongwol.