• Proceedings of the Korea Society of Environmental Biology Conference
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• 2002.05a
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• pp.41-41
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• 2002

• Korean Journal of Ecology and Environment
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• v.34 no.2 s.94
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• pp.90-97
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• 2001

The seasonal changes in phytoplankton standing crops, species composition, dominant species, species diversity and physico-chemical characteristics in Woopo and Mokpo swamps were studied from January to December, 1998. Phytoplankton of a total 353 taxa were identified, the composition of phytoplankton community was characetrized by green algae and diatoms and quantity composition of standing crops was dominated by green alga Oscillatoria sp. was especially prominent. The standing crops varied from 108 cells/ml and 118 cells/ml to 19,178 cells and 38,393 cells/ml in Woopo and Mokpo swamps, respectively. The maximum algal density was observed in November, Micractinium pusillum and Oscillatoria sp. usually contributed 83.2% to total cell numbers in Woopo swamp. However, the maximum density occurred in May when Oscillatoria sp. formed bloom in Mokpo swamp. The low species diversity of the phytoplankton coincided with maximum standing crops of the filamentous blue-green alga Oscillatoria sp. and green alga Micractinium pusillum in May and November.

• Journal of Korean Society of Environmental Engineers
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• v.35 no.6
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• pp.430-435
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• 2013

A seasonal variation of phytoplankton community in the middle-lower part of the Nakdong River was studied in four sampling stations at monthly intervals from January to December 2012. We identified 40 genera 72 species of phytoplankton. Among these, diatoms were 36 species (50.0%), green algae 20 species (27.8%), blue-green algae 9 species (12.5%) and others 7 species (9.7%), respectively. The phytoplankton standing crops were recorded a maximum of 29,640 cells/mL at the Mulgeum (St. 4) in June and a minimum of 236 cells/mL at the Goryung (St. 1) in October. Also, Standing crops were increased with proceeding from middle part to lower part. Ecological important species were Stephanodiscus hantzschii, Cyclotella meneghiniana, Synedra acus, Aulacoseira granulata, Pediastrum sp. and Microcystis aeruginosa. Seasonal succession of phytoplankton represented that Stephanodiscus hantzschii was dominant species in winter, Cyclotella meneghiniana, Synedra acus was dominant species in spring, Microcystis aeruginosa, Cyclotella meneghiniana, Fragilaria crotonensis, Synedra acus, Aulacoseria granulata was dominant species in summer, and Aulacoseria granulata, Cyclotella meneghiniana, Fragilaria crotonensis was dominant species in autumn. In the community analysis, diversity index and dominant index were higher May~July and December~February, respectively. Also, diversity index and dominant index were decreased and increased with proceeding from middle part to lower part.

• The Korean Journal of Soil Zoology
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• v.8 no.1_2
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• pp.32-36
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• 2003

Diversity and altitudinal distribution of the ground-beetles including Silphidae were investigated on Mt. Gabjangsan, Sangju city, Korea. Of the collected 10 species belonging to 3 families, Synuchus cycloderus was the most abundant species and S. nitidus was the relatively more abundant than the other species. The highest number collected was at alto 700 m. Simpson dominance index was 0.66 the highest at 700 malt., whereas, 0.47 at alto 800 m, was the lowest. The highest Simpson diversity index was noticed at alto 800 m (0.53). Also, seasonal indices of diversity and dominance of Simpson and Menhinick index were provided.

• Korean journal of applied entomology
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• v.26 no.3 s.72
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• pp.133-138
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• 1987

This study was conducted during Oct. 1986$\sim$Apr. 1987 to investigate the distribution, dominance and species diversity of soil arthropods communities from two collection sites of Suwon and Mt. Jiri. A total of 2,989 specimens of 3 orders, 20 families and 19 species were identified. In overall dominance index, Suwon community showed lower value than Mt. Jiri community. Seasonal variation dominance index were higher in Suwon community than those in Mt. Jiri community.

• Korean Journal of Environment and Ecology
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• v.11 no.2
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• pp.160-165
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• 1997

The objective of this study was to analyze dominance-diversity of Quercus mongolica community which characterize the boreal-temperate deciduous forest in Korea. Employing the releve method of Muller-Domboes and Ellenberg, 100 quadrats were sampled in the natural forest of Mt. Odae, Mt. Chumbong and Mt. Jungwang in Kangwon-do, where Quercus mongolica community is in the situation of climax or subclimax. On the basis of Braun-Blanquet method, field survey, which accounts ffor the characters of the species structure of Quercus mongolica community, was carried out between 1991 and 1994. Quercus mongolica community was relatively in a stable condition because of the even distribution of its various indices: the species diversity index was 0.4~1.2; the species richness index was 2~11; the evenness index was 0.6~0.9. The dominance-diversity curve were comparatively of lognormal distrivution with a gentle slope in all communities. The species sewuence curve for Quercus mongolica - Lindera obtusiloba community had relatively a steep slope, which meant that the evenness of the community would be low. The species sequence curve for Quercus mongolica - Carpinus cordata community had a slow slope, which meant that the evenness and the stability of the community would be high.

• The Korean Journal of Mycology
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• v.41 no.2
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• pp.57-66
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• 2013

The mushrooms collected at seven areas of Mt. Chiak in 2002 and 2003 were classified to analyse the distribution and species diversity. Frequency (number of mushroom : N), number of species (S), relative species density (RSD), similarity index (C), richness index (R1), variety index (V1), evenness index (E2), and dominance index(D1) were investigated. Total N and S was 143 and 84, respectively. The RSD was 0.179 ~ 0.226 of the 7 areas. The yearly C of the total area (0.213) was 8.2%. more higher than the average C of 7 areas (0.131). The order in the coefficient of variation (CV) of the indicator for 7 areas was N (10.5%) > D1 (9.2%) > V1 (8.9%) > S (8.5%) > R1 (7.4%) > E2 (2.2%). The average R1 of the 7 areas was 5.36 with the range from 4.85 to 6.01, and 16.72 for the total area. The average V1 of the 7 areas was 16.24 with the range from 14.44 to 18.66, and 68.82 for the total area. The average E2 of the 7 areas was 0.95 with the range from 0.926 to 0.982, and 0.819 for the total area. The average D1 of the 7 areas was 0.071 with the range from 0.055 to 0.073, and 0.081 for the total area. The correlation between N and 5 kinds of diversity indicator (S, R1, V1, E2, D) was not statistically significant, but the correlation between R1, E2 and D1 was statistically significant each other.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1989.06a
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• pp.1-21
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• 1989

합성윤활유(synthetic lubricant)라 함음 현재까지도 계속되고 있는 광유(mineral oil)전성시대의 광유에 대응되는 말로써 광유계 윤활유로 부터 얻기 어려운 높은 점도지수, 낮은 저온 유동성 등의 특성을 얻기 위해 유기합성 방법에 의해 인위적으로 제조한 윤활유의 총칭이며 작용기의 종류, 합성방법, 등에 따라 다양하게 분류된다. 합성윤활유의 종류에는 합성방법에 따라 폴리머형(P형), 비포리머형(N형)으로 대별되는데, 폴리머형 합성유에는 Poly-butene, $Poly\alpha$-olefin, Polyalkylenglycol, Silicon oil, Chlorofluorocarbon, Perfluoroalkyl polyether등이 있으며, 비폴리머형 합성유에는 Alkylbenzene, Dibasicacidester, Polyolester, Silicate-ester Polyphenylether, Complex ester등이 포함된다. 전자의 경우에는 중합반응 조건을 조절하므로써 여러점도 등급의 합성유들을 얻을 수 있는 반면 후자의 경우에는 분자량이 크지 않으므로 저점도의 것만 얻어지는 것이 특징이다.

• The Korean Journal of Pesticide Science
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• v.14 no.3
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• pp.255-260
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• 2010

Insect diversities in non-organic and organic Chinese cabbage and pepper fields were studied in 2009. Sixty-two species in 9 orders and 24 species in 6 orders were collected in organic and non-organic Chinese cabbage fields, respectively. In pepper fields, insect diversity was also higher in organic fields than in non-organic ones. Dominance index, diversity index, richness index, and evenness index in organic fields were higher than those in non-organic fields.

• Journal of Wetlands Research
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• v.3 no.1
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• pp.19-28
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• 2001

This study was carried out to investigate the benthic macroinvertebrates community of three surveyed sites, Kwangdeok-gyo, Yangeochang, and Gudam-gyo, located at Gudam in Gyeongsangbuk-do. The benthic macroinvertebrates collected from the surveyed sites were composed of 47 species, 26 families, 11 orders, 5 class, 3 phyla. Among these phyla, aquatic insects in Arthropoda were 38 species, 20 families and 5 orders. Each of sites has shown the particular situation of aquatic insect fauna on the species composition. Chironomus sp. at the all surveyed sites was dominant species. Dominance indices(DI) showed most highly at St. 2 and lowly at St. 1. The species diversity indices(H') showed the highest at St. 1 and lowest at St. 2. Dominance indices ranged 0.40~1.00(mean, 0.69), and species diversity indices ranged 0.04~3.40(mean. 1.98).