• Korean Journal of Environment and Ecology
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• v.12 no.4
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• pp.345-360
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• 1999

The purpose of this study was to suggest vegetation management Planning and plant community structure of Camellia Japonica forest at Hakdong, Kojedo, Hallyo-Haesang National Park. Forty-six plots(l00$\m^2$/plot) were established in Camellia japonica forest and surveyed. By DCA ordination technique and mean importance value analysis, the plant communities were classified into four community types, which were Camellia japonica community, Camellia japonica-Eurya japonica community, Camellia japonica-Neolitsea sericea community, Chumaecyparis obtusa-Camellia japonica community. It was supposed that Camellia japonica-Neolitsea sericeu community succeeded to Neolitsea sericea community. The others would not be replaced by another woody species. The vegetation management for successional controls in long-term basis were suggested; for the short-term basis, the species of Chamaecyparis obtusa, Neolitsea sericea and Eurya japonica should be removed. The species of Quercus serrata, Prunus sargentii, Meliosma myriantha, Machilus thunbergii and Litsea japonica. must be controlled under the long-term management of vegetation.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2007.04a
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• pp.85-88
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• 2007

본 연구에서는 베이지안 망 구조 학습에서, 학습 데이터의 특정 부분집합이 학습된 망의 각연결 구조(edge)의 형성에 기여하는 정도를 정량화하는 방법을 제안한다. 생물학 정보의 분석 등에 베이지안 망 학습을 이용하는 경우, 제안된 방법은 망의 각 연결 구조의 형성에 특정 군집 데이터가 기여하는 정도의 정량화가 가능하다. 제안된 방법의 유효성을 보이기 위해, 벤치마크 베이지안 망을 이용하여 제안된 방법이 망 연결 구조에 대한 데이터 군집별 기여도를 효과적으로 정량화 할 수 있음을 보인다.

• Korean Journal of Environmental Biology
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• v.28 no.1
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• pp.40-48
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• 2010

A total of 63 taxa was identified with a mean abundance of total zooplankton ranging from 85~28,087 indiv.$m^{-3}$. Cluster and nMDS analysis showed that the study sites could be divided into two regions: North and East part of the sampling area (group A) and South part of the sampling area (group B). The number of taxa and species varied significantly among the two regions (ANOVA, p<0.05). The pattern of the spatio-temporal distribution of the zooplankton community in the coastal waters around the Wolseong Nuclear Power Plant is affected by the variations of seasonal water temperature. However, zooplankton community were no significant between the water temperature and heated discharge.

• Korean Journal of Microbiology
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• v.36 no.2
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• pp.136-141
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• 2000

The temporal variation of bacterial community and environmental factors, affecting on bacterial community structure were estimated monthly kom April, 1998 to May, 1999. Bacterial community structures were determined by in situ hyblidization with rRNA-targeted fluorescently labeled oligonucleotide probes (FISH) and epifluorescence microscopy; and the statistical analysis was done by SPSS program. The oligonucleotide probes used in this study were EUB338, ALFlb, GAM42a, and CF. In surface water, $\alpha$-group was related to only DOC (-0.538, p<0.05) and Chlorophyll a concentration was related to y-group (-0.630, p$\beta$-group and Cytophaga-Flavobacterium group were related to water temperature as 0.665, and 0.685 @<0.05). Between pH and $\beta$-group, there was a positive relationship (0.541, p<0.05), and Cytophaga-Flavobactevizim group was represent to correlation (0.672, p

• Korean Journal of Soil Science and Fertilizer
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• v.32 no.3
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• pp.319-325
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• 1999

A culture-dependent survey of bacterial community in the soil-root system of red pepper and tomato was conducted by dilution plate count method. The bacterial community within soil was not different from that of rhizoplane. However, the populations of fluorescent, pseudomonads were higher in rhizoplanes than in soils and higher in healthy rhizoplanes than in Phytophthora disease-infested rhizoplanes. The bacterial community of the pepper cropped soil and rhizoplanes was very similar to that of the tomato-cropped soil and rhizoplanes. Among 285 identified bacterial colonies, most colonies were belong to two groups by fatty acid analyses: 52% of the 285 colonies were belong to low G + C gram positive bacteria group. Bacillus spp. and 33% were belong to high G + C gram positive bacteria group. In order to use beneficial microorganisms to agro-ecosystem, these data of field trials should be intensively accumulated.

• Journal of Life Science
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• v.33 no.4
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• pp.325-333
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• 2023

This study compared and analyzed the microbial composition and physicochemical characteristics of kimchi (gimjang kimchi) and mukeunji (aged kimchi). Commercial kimchi and mukeunji products were purchased through an online market. After an analysis of physicochemical characteristics, the pH of the mukeunji samples was found to be lower and the acidity higher than in the kimchi samples. There was no significant difference in salinity between kimchi and mukeunji, but the sugar content was higher in the kimchi samples. The phylogenetic diversity index, which incorporates phylogenetic difference between species, was significantly higher in mukeunji than in the kimchi. The most dominant order in both groups was Lactobacillales, but several lactic acid bacteria, such as the Pediococcus and Lactobacillus species, which may be more acid tolerant or more competitive, are relatively predominant in mukeunji. Beta set-significance analysis based on two different distance metric results revealed that microbial distributions of population were different at the statistical confidence level (p<0.001). We investigated the effect of respective species on total microbial community using the LEfSe (linear discriminant analysis effect size) mechanism. According to the results of LEfSe testing, a relatively higher abundance of Weissella kandleri in kimchi and a higher abundance of Pediococcus inopinatus in mukeunji have the greatest influence on the differences in microbial structure between the two groups.

• Korean Journal of Environment and Ecology
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• v.11 no.4
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• pp.433-449
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• 1998

To study the plant community structure of Chayang-chon area from Jangsudae to Hangyeryung in Soraksan National Park, 62 plots(each size 100m$^2$) were set up and surveyed. Six communities(Pinus densiflora - Populus caximowiczii community, P. densiflora community, P. densiflora - Deciduous broad-leaved tree community, Quercus mongolica community, Q. mongolica - Carpinus cordata community, C. cordata - Deciduous broad- leaved tree community) were classified by DCA ordination techniques. Q. mongolica community, Q. mongolica - C. cordata and C. cordata - Deciduous broad-leaved tree community were distrivuted over altitude 755m, and the others were distributed below there. In the community over altitude 755m, the succession that Q. mongolica community changed to C. cordata community have proceeded partly and otherwise C. cordata community and Deciduous broad-leaved tree community have been competing with each other. In the community with distribytion range from 500m to 560, high, P. densiflora community would change deciduous broad-leaved tree community forward.

• Journal of the Korean Society for information Management
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• v.22 no.2 s.56
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• pp.205-228
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• 2005

This research analyzed changes of the intellectual structure of web information by examining time changes and search engines using the co-links analysis. According to the results, the co-links web information clusters on the two maps appeared to contain changes in the intellectual structure over the two time periods. The intellectual structure that appeared in the information map for AltaVista and MSN Search engines was relatively similar. However. there were also cases where the clusters of some web information was different. The results of the research revealed that the cocitation analysis could be applied simultaneously to diachronous analysis in the web information.

• Journal of Life Science
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• v.32 no.10
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• pp.803-811
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• 2022

Despite the importance of traditional Korean fermented foods, little is known about the microbial communities and diversity of fermented soy products. To gain insight into the unexplored microbial communities of both Doenjang (DJ) and Ganjang (GJ) that may contribute to the fermentation in Korean traditional foods, we carried out next-generation sequencing (NGS) based on the V3-V4 region of 16S rDNA gene analysis. The alpha diversity analysis results revealed that both the Shannon and Simpson diversity indices were significantly different between the two groups, whereas the richness indices, including ACE, CHAO, and Jackknife, were not significant. Firmicutes were the most dominant phylum in both groups, but several taxa were found to be more abundant in DJ than in GJ. The proportions of Bacillus, Kroppenstedtia, Clostridium, and Pseudomonas and most halophiles and halotolerant bacteria, such as Tetragenococcus, Chromohalobacter, Lentibacillus, and Psychrobacter, were lower in DJ than in GJ. Linear discriminant effect size (LEfSe) analysis was carried out to discover discriminative functional biomarkers. Biomarker discovery results showed that Bacillus and Tetragenococcus were identified as the most important features for the classification of subjects to DJ and GJ. Paired-permutational multivariate analysis of variance (PERMANOVA) further revealed that the bacterial community structure between the two groups was statistically different (p=0.001).

• The Korean Journal of Applied Statistics
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• v.30 no.1
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• pp.57-68
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• 2017

Clustering algorithms attempt to find a partition of a finite set of objects in to a potentially predetermined number of nonempty subsets. Gibbs sampling of a normal mixture of linear mixed regressions with a Dirichlet prior distribution calculates posterior probabilities when the number of clusters was known. Our approach provides simultaneous partitioning and parameter estimation with the computation of classification probabilities. A Monte Carlo study of curve estimation results showed that the model was useful for function estimation. Examples are given to show how these models perform on real data.