• Title/Summary/Keyword: two communities

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Pattern Recognition of Long-term Ecological Data in Community Changes by Using Artificial Neural Networks: Benthic Macroinvertebrates and Chironomids in a Polluted Stream

  • Chon, Tae-Soo;Kwak, Inn-Sil;Park, Young-Seuk
    • The Korean Journal of Ecology
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    • v.23 no.2
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    • pp.89-100
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    • 2000
  • On community data. sampled in regular intervals on a long-term basis. artificial neural networks were implemented to extract information on characterizing patterns of community changes. The Adaptive Resonance Theory and Kohonen Network were both utilized in learning benthic macroinvertebrate communities in the Soktae Stream of the Suyong River collected monthly for three years. Initially, by regarding each monthly collection as a separate sample unit, communities were grouped into similar patterns after training with the networks. Subsequently, changes in communities in a sequence of samplings (e.g., two-month, four-month, etc.) were given as input to the networks. After training, it was possible to recognize new data set in line with the sampling procedure. Through the comparative study on benthic macroinvertebrates with these learning processes, patterns of community changes in chironomids diverged while those of the total benthic macro-invertebrates tended to be more stable.

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Characteristics of Breeding Bird Communities in Mt. Namsan, Seoul, Korea

  • Rhim, Shin-Jae;Lee, Ju-Young;Kang, Jeong-Hoon
    • Journal of Korean Society of Forest Science
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    • v.95 no.5
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    • pp.580-584
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    • 2006
  • This study was conducted to clarify the characteristics of breeding bird communities between deciduous and coniferous forests from April to June 2005 in Mt. Namsan, Seoul, Korea. Two 10ha areas were selected for territory mapping of breeding bird communities. Number of breeding bird species, pairs,density and bird species diversity index were higher in deciduous forest with increasing amount of foliage in the forest profile or as forest structures developed compared with coniferous forest. The number of in coniferous forest. The differences in habitat structure between both study areas are very likely to have influenced how breeding birds used the available habitat. Forest structure and its interactions with birds should be consideration in forest management for birds and their habitat.

Effects of Winter Fire on Arthropoda Communities of Rice Fields (잔디 초지의 쥐불이 인접한 논의 절지동물군집의 동태에 미치는 영향)

  • 이학섭;장남기
    • Asian Journal of Turfgrass Science
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    • v.4 no.2
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    • pp.101-118
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    • 1990
  • Effects of Zoysia japonica fired in winter on the arthropoda communities in its grassland and rice field was investigated . The results gave indicated that a significant difference between total 15,120 individuals of 4 classes, 11 orders, 47 families, 92 genera and 103 species in the control of Zoysia japonica grassland, and total 1, 404 individuals of 4 classes, 11 orders, 47 families, 53 genera 65 species in the Zoysia japonica grassland fired in winter. Index of similarity of Zoysia japonica grasslands between Kimpo and Yangsuri areas was 0.51. Dominant species of arthropoda communities in Zysia japonica grasstands in Kimpo and Yangsuri areas were Hypogastnua sp. and Proisotorn sp., respectively. The spiders were 9 families and 27 species at Kimpo, and t2 families. and 44 species at Yangsuri, and their dominant species was Gnathonariurn dentaturn at two areas. Laodelphex striatelus in the Zoysia japonica grassland fired in winter was sampled constantly morning, noon and night, hut Gnatlzonariun dentatum was sampled more frequently in the morning than at night. Damage of the spiders in the Zoysia japonica granssland fired in winter was more severe than that of Laodelphcx striatelus .

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Discourse of Minority Communities: Comparing Archetypal Heroes in Nguyễn Huy Thiệp's "The Tiger's Heart" (1971) and John Steinbeck's The Pearl (1947)

  • Nguyen, Thi Thu Hang;Nguyen, Thi Kim Ngan
    • SUVANNABHUMI
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    • v.14 no.1
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    • pp.53-70
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    • 2022
  • This article compares archetypal heroes in Nguyễn Huy Thiệp's "The Tiger's Heart" and John Steinbeck's The Pearl. It aims to explore the voices of marginalized groups and ethnic minorities who suffer amidst the clash of civilizations. In exploring cultural communication between minority and mainstream communities as embodied by the archetypal heroes in the two works, this article highlights implications of resistance against values of the dominant. The method of "mythization" in modern Eastern and Western Literature, as this article argues, demonstrates the importance of minority discourses in as far as cultural conflicts in the globalizing world are concerned.

Species Diversity of Endophytic Fungi Isolated from Taxus cuspidata Inhabiting Mt. Hallasan, Korea

  • Jae-Eui Cha;Hyeok Park;Ahn-Heum Eom
    • The Korean Journal of Mycology
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    • v.51 no.4
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    • pp.419-428
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    • 2023
  • Several endophytic fungal strains were isolated from Taxus cuspidata and identified by molecular analysis of the internal transcribed spacer and RNA polymerase II second largest subunit. This study aimed to determine the relative abundance and compare the species diversity of endophytic fungal communities within needle leaves and twigs. We identified a total of 49 endophytic fungal species. Notably, two species, Trichoderma dingleyae and Xylaria cubensis, were discovered to be previously unrecorded in Korea. The fungal communities in both plant tissues demonstrated distinct species composition. Differences were observed in the relative abundance and species diversity index between needle leaves and twigs. Our findings suggest that the host plant tissues influence the species diversity of endophytic fungal communities.

Evaluation of Atopy Dermatitis Information on the Internet in Korea

  • Seo, Min-Jun;Park, Jin-Han
    • Journal of Evidence-Based Herbal Medicine
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    • v.1 no.2
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    • pp.1-6
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    • 2008
  • The internet is closely related to the lives of modern people in the 21st Century. Exchanging information with others over the internet in any place through is possible nowadays and such exchanging information has been developed at rapid speed also in the areas of medical care. The internet is an important and rapidly-evolving source of health-related information, and many patients with atopy dermatitis attempt to find information from the internet. This study was performed to investigate the current information available in atopy dermatitis on the internet in Korea. We chose three portal sites and two network communities to analyze the information in which the topic of 'atopy' could be found. Among the 2,024 web sites and 5,613 network communities, 98.2% of the web sites and 71.7% of the communities were related products or service advertisements, and some of them provided incorrect of exaggerated information. There were only 42 web sites and 75 available communities with genuine information, and most of these also presented unattested treatment methods, including alternative therapies. It is quite understandable that patients with atopy dermatitis want to seek information related to their disease and the internet has the potential to be a useful source of information. However, there are no regulations to control the accuracy and quality of information on the internet. We should take an active role in identifying the accuracy and evaluating the quality.

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Detrended canonical correspondence analysis and polar ordination analysis on the forest communities of mudungsan. (DCCA 와 Polar Ordination 에 依한 無等山의 森林 群落 分析)

  • Kim, Chang-Hwan;Kil, Bong-Seop
    • The Korean Journal of Ecology
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    • v.15 no.2
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    • pp.117-125
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    • 1992
  • TWINSPAN(two-way indicator species analysis), DCCA(detrended canonical correspondence analysis) and polar ordination method wee used so as to analyze the the relation between forest vegetation and hibitat of mudungsan(1, 187m) located in kwangju area. Vegetationsurvey consulted 1:25, 000 topographical map, set up 41 quadrats and analyzed from April, 1990 to August, 1991. Forest vegetation of mudungsan was classifild to quercus acutissima community, fraxinus mandshurica community, quercus mongolica community, quercus serrata community, quercus dentata community, quercus variabilis community, and pinus densiflora community by TWINSPANmethod, and this almost coincide with the result of plar ordination. according to DCCA analysis, P. densiflora community was formed in xeric and low altitude region which soil nutrient was poor, compared with other communities. q. variabilis and q. acutissima community wee distributed in the region that low altitude and organic matter content was comparatively low, but q. acutissima community was formed in a damp region while q. variabilis community in a xeric region. q. mongolica and f. mandshurica formed the communities in a high altitude region, especially f. mandshurica cmmunity was distributed in a high humidity region. According to polar ordination analysis, the forest vegetation was classified to 7 communities by means of environmental gradient such as humidity, organic matter, ph, temperature, c.e.c and P2O5.

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Relational Market Behavior of Fashion Online Community Members (패션 온라인 커뮤니티 가입자들의 관계지향적 행동)

  • Chang, Yu-Jeong;Park, Jae-Ok;Youn, Song-Yi;Lee, Kyu-Hye
    • The Research Journal of the Costume Culture
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    • v.15 no.1 s.66
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    • pp.58-67
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    • 2007
  • The popularity of communities on the Internet has captured the attention of marketing professionals and more consumers are involved in online activities of fashion brands. The primary purpose of this research was to explain the process of how online interactivity influence members' relational market behavior. Subjects of this study were male and female members of online communities of fashion brands. Online survey data were obtained from 416 respondents. Empirical findings of this study were suggestive of two types of interaction in fashion online communities: community-customer interaction and customer-customer interaction. Fashion online community customers' relational market behavior (word of mouth and repurchase intention) was significantly influenced by both types of interactivity. The influence of interactivity on relational behavior was stronger for word of mouth intention than for repurchase intention. This study highlights the importance of interactivity in cyberspace as well as relational market behavior and contributes to e-relationship marketing strategies of fashion brands.

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Comparison of Soil Higher Fungal Communities between Dead and Living Abies koreana in Mt. Halla, the Republic of Korea

  • Kim, Chang Sun;Jo, Jong Won;Lee, Hyen;Kwag, Young-Nam;Cho, Sung Eun;Oh, Seung Hwan
    • Mycobiology
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    • v.48 no.5
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    • pp.364-372
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    • 2020
  • To improve our understanding of the relationship between soil higher fungi (belonging to Ascomycota and Basidiomycota) and Abies koreana, we surveyed A. koreana soil fungal communities in a forest in Mt. Halla, Jeju Island, Korea by next-generation sequencing (Illumina Miseq). To confirm the soil higher fungal communities, we collected two types of soils from a defined plot: soils with dead (AKDTs) and living A. koreana (AKLTs), respectively. Soil fungi were classified into 2 phyla, 19 classes, 64 orders, 133 families, 195 genera, and 229 OTUs (895,705 sequence reads). Nonmetric multidimensional scaling (NMDS) showed significantly different soil higher fungal communities between AKDTs and AKLTs (p < .05). In addition, the saprophyte composition was significantly affected by A. koreana status (p < .05). The proportion of the mycorrhizal Clavulina spp. was different between soils with AKDTs and AKLTs, suggesting that Clavulina spp. may be a crucial soil fungal species influencing A. koreana. This study will lead to a better understanding of the ecological status of A. koreana in Mt. Halla. In addition, this study could be useful for the conservation and management of A. koreana habitats.

Effects of Debate Education on the Perception of Agricultural and Rural Values - Focused on the adolescent - (농촌 디베이트 교육이 농업농촌 가치 인식에 미치는 영향 - 청소년을 대상으로 -)

  • Jung, Nam-Sick;Choi, Eun-hee;Kim, Yong-Geun
    • Journal of Korean Society of Rural Planning
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    • v.25 no.3
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    • pp.103-114
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    • 2019
  • The purpose of this study is to investigate the value perception changes of early adolescents, who are from 5th grades to 7th grades regarding to agriculture and rural communities through debate education. Since current education policy to educate agricultural value is limited in solving stereotypes and acquiring abundant relevant knowledge about agricultural values, this study tried to test the effect of debate education for the change of value perception of early adolescents about agriculture and rural communities. Through the two weeks of a debate education course, the differences of perception changes between the experimental group and control group were analyzed. As a result, education on agriculture and rural communities through debate has a great influence on the change of value perception and thus, it could be used as a supplementary educational method for literacy education and field trip learning. Lastly, limitations and implications for the study is discussed.