점봉산 (點鳳山) 잣나무임분의 개체목 공간분포에 따른 유전구조

홍경락(Kyung Nak Hong),권영진(Young Jin Kwon),정재민(Jae Min Chung),신창호(Chang Ho Shin),홍용표(Yong Pyo Hong),강범룡(Bum Yong Kang) 한국산림과학회 2001 한국산림과학회지 Vol.90 No.1

Genetic differentiation of populations is resulted from the environmental and the genetic effects, and the interactions between them. Whereas, the major factors influencing to the genetic differentiation within populations are the gene flow induced by seed or pollen dispersial, the microsite heterogeneity, and the density-dependent distribution of individuals. For the purpose of studying spatial genetic structure and the distribution pattern of Korean pines(Pinus koraiensis), we set up one 100 × 100㎡ plot at a Korean pine stand in Quercus mongolica community on Mt. Jumbong in Korea. To estimate the coefficient of spatial autocorrelation as Moran`s index and an analogue, simple block distance, isozyme markers were analyzed in 325 Korean pines. For 11 polymorphic loci observed in 9 enzyme systems, the average percentage of polymorphic loci, the observed and expected heterozygocity were 72.2% 0.200, and 0.251, respectively. It was revealed the excess of homozygotes was observed in the plot, which suggests that here may be more number of consanguineous trees than expected. On the basis of isozyme genotypes observed in this study, 325 trees were classified into 147 groups in which the maximum number of trees for one group was 34. From the distance class of 24-32m, the genetic heterogeneity began to increase. The variation of simple block distance against the growth performance by tree height and diameter also showed the same trend at 24-32m class. According to high fixation index(F=0.204), the spatial genetic structure within a stand, the analysis of the growth performance, and the distribution patterns of identical genotypes, we inferred that the genetic structure of a Korean pine stand in Mt. Jumbong has been maintained rather density-dependent mechanism than the gene flow, such as the pollen dispersial or the heavy input of seeds following the forest gaps. The genetic patchy size was determined between 24-32m, which suggests that the selection of individuals for the ex situ conservation of Korean pine in Mt. Jumbong may be desirable to be made with the spatial distance over 37 meters between trees.

백합나무 시험림의 모의간벌 (模擬間伐)에 따른 유전다양성 변화

홍용표(Yong Pyo Hong),류근옥(Keun Ok Ryu),조경진(Kyung Jin Cho),홍경락(Kyung Nak Hong) 한국산림과학회 2001 한국산림과학회지 Vol.90 No.1

Changes in genetic diversity after seed-tree practice were simulated in test plantation of tulip tree at Sokdal-ri, Banwol-myon, Hwasung-gun, Kyungki Provence. I-SSR markers were analyzed in a total of 305 tulip trees. A total of 89 amplicon variants were observed by PCR with 9 I-SSR primers. Genetic diversity for 305 trees was relatively high (S. I. =0.4532). Individuals originated from the seed orchards in U.S.A. showed the highest level of genetic diversity (0.4530), those from Anyang showed the medium level (0.4152), and those from Cheonbuk showed the lowest (0.3929). Simulation of seed-tree practice accompanied by 2 consecutive thinnings was performed on the basis of morphological characteristics and planted distances of the individual trees, which left 37 trees as candidates for seed-trees. Decreasing rate of genetic diversity within seed sources was greatest for individuals from Cheonbuk (28.3%), moderate for those from Anyang (16.3%), and smallest for those from U.S.A. (8.0%). In spite of little difference in decreasing rate of individuals for the 3 seed sources (87.5-88.2%), large difference in decreasing rate of genetic diversity within seed sources might be due to difference in number of mother trees for the 3 seed sources. For example, whereas individuals originated from the seed orchard in U.S.A., which showed the smallest decreasing rate of genetic diversity, might be originated from relatively large number of mother trees, those from Anyang and Cheonbuk might be originated from relatively small number of mother trees. Although mean of 17.5% of the genetic diversity within seed sources was decreased through 2 consecutive thinnings, a decrease in genetic diversity for the whole individuals (37 trees) was only 6.1%. This observation suggests that the seed-tree practice on the basis of the criteria established in the present study may not result in great reduction in overall genetic diversity of the progenies.

RAPD 분석에 의한 소나무 천연집단의 유전변이

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.

소셜미디어를 활용한 여행지 평점 예측을 위한 합성곱 신경망 기반의 필터링-스코어링 시스템

김민구,홍승우,서일홍 대한전자공학회 2019 전자공학회논문지 Vol.56 No.9

Rating information of travel attractions provides intuitive and comprehensive information for trip planning. However, such rating information has a disadvantage that it is difficult to guarantee high reliability when there are only a few reviews. Therefore, in this paper, we propose a system for predicting the ratings of tourist attractions using posts from social media services. The system searches and collects a large number of posts from a social media by using the name of a given tourist attraction as a keyword, classifies the posts into a reviews and non-rieviews using a filtering model, predicts the rating of each review using a scoring model. Predicted ratings are then averaged to predict the overall rating of the given travel attraction. Also, deep learning based filtering and scoring model structures are proposed along with the Korean data argumentation method to improve the performance of the proposed system. 여행 계획을 세우는데 있어 관광지 평점 정보는 직관적이고 종합적인 정보를 제공해준다는 장점을 갖고 있다. 하지만, 이러한 평점 정보는 많은 사람들의 평가가 없으면 높은 신뢰도를 보장하기가 힘들다는 단점이 있다. 따라서, 본 논문에서는 소셜미디어의 글들을 이용하여 관광지의 평점을 예측하는 시스템을 제안하였다. 해당 시스템은 주어진 관광지의 이름을 키워드로 소셜미디어에서 다수의 글들을 검색 및 수집하고 사전에 학습시켜둔 필터링 모델을 이용하여 리뷰 성격의 글들과 리뷰가 아닌 글들을 분류하고, 리뷰로 분류된 글들을 스코어링 모델을 이용하여 각각 평점을 매긴 후 전체 평점들을 평균 내어 최종적으로 주어진 관광지의 평점을 예측한다. 또한, 본 논문에서 제안하는 시스템의 성능향상을 위하여 딥러닝 기반의 필터링, 스코어링 모델 구조와 함께 한국어 데이터 증강 기법도 제안하였다.