http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
연구논문 : 농업용저수지인 오태지의 수생태계구조와 수질과의 관련성
서정관 ( Jung Kwan Seo ),이혜진 ( Hae Jin Lee ),정현기 ( Hyun Gi Jeong ),탁보미 ( Bo Mi Tak ),이재관 ( Jae Kwan Lee ),김인택 ( In Taek Kim ),이종은 ( Jong Eun Lee ),황의욱 ( Ui Wook Hwang ) 한국환경과학회 2010 한국환경과학회지 Vol.19 No.11
This study was carried out to elucidate the relation between water quality and structure of the aquatic ecosystem in the agriculture reservoir Otae-ji from January to December in 2009. The proportion of forest was 46.98%, which means that non-point sources are major contributor of water pollution in this area. The annual mean COD(Chemical Oxygen Demand) in Otae-ji was 3.6 mg L-1, indicating, level II of environmental standards and the trophic state was mesotrophic. Although total phosporus concentration in the reservoir was high in August due to large inflow of nutrients from outside the reservoir during monsoon season, there was no break out of significant algal bloom in the summer. The seasonal succession of phytoplankton showed that the dinophyta dominated in the the spring, chlorophyta in the summer, chrysophyta and chlorophyta in the autumn and chrysophyta in the winter. In case of zooplankton, rotifers dominated in the most seasons, but cladoceran(Bosmina longirostris) dominated in June and copepod(Nauplii) in August. The macrophyte plants showed diverse species composition consisted of 3 varieties, 24 species, 23 genera, 15 families and 14 orders. The macroinvertebrates also showed various FFG(Functional Feeding Groups) such as GC(Gathering-Collector), P(Predator), SH(Shedder), FC(Filter-Collector) and PP(Plant-Piercer). Ecosystem stability analysis using aquatic insects was classified as Group I, which has high resilience and resistance indices. A total of 14 species of fish was collected but exotic species such as Lepomis macrochirus and Micropterus salmoides were not found in Otae-ji. In conclusion, the preservation of healthy food wed in the reservoir ecosystem is closely related to water quality management as well as effective prevention of algal bloom by helping good material circulation in aquatic ecosystems.
해양플랜트 구조물의 화재 사고 시 PFP 효과를 고려한 비선형 구조응답 해석 기법에 대한 연구
김정환(Jeong Hwan Kim),이동훈(Dong Hun Lee),하연철(Yeon Chul Ha),김봉주(Bong Ju Kim),서정관(Jung Kwan Seo),백점기(Jeom Kee Paik) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.4
In offshore structures, fire is one of the most important hazardous events. The concern of fires has recently been reflected in the rules and quantified risk assessment based design practice. Within the framework of quantified risk assessment and the management of offshore installations, therefore, more refined computations of the consequences or hazardous action effects due to fire are required. To mitigate fire risk, passive fire protection(PFP) is widely used on offshore structures. This study presents methods for a nonlinear structural response analysis considering the PFP effects under fires. It is found that a structural response analysis is most likely to use valuable technology for the optimization and design of offshore structures with PFP. Thermal and structural response analyses have been performed using LS-DYNA and FAHTS/USFOS. The results of these structural response analyses are compared with each other.
박연정 ( Yeon Jeong Park ),이혜진 ( Hae Jin Lee ),서정관 ( Jung Kwan Seo ),탁보미 ( Bo Mi Tak ),정현기 ( Hyun Gi Jeong ),이재관 ( Jae Kwan Lee ) 한국환경생물학회 2011 환경생물 : 환경생물학회지 Vol.29 No.4
This study was carried out to investigate the relation between water quality and structure of the aquatic ecosystem in the Lake Gachang from February to December in 2010. The annual mean COD (Chemical Oxygen Demand) in Lake Gachang was 3.5 mg L 1, indicating, level II of environmental standards and the trophic state was mesotrophic. The seasonal succession of phytoplankton showed that Bacillariophyceae was mostly dominant species throughout the year except August. In case of zooplankton, rotifers dominate in the most seasons, but copepod (Nauplii) in August. The macrophyte plants showed diverse species composition consisted of 9 varieties, 77 species, 64 genera, 34 families and 24 orders. Surveyed species of macroinvertebrates were classified into 1 phyla, 2 classes, 4 orders, 7 families, 9 species. The macroinvertebrates showed FFG (Functional Feeding Groups) such as GC (Gathering Collector) and SH (Shedder). A total of 42 species of fish was collected including Zacco koreanus and Coreoperca herzi. In this study, we investigated environmental factors including pollutant source, load, water quality and distribution characteristics of biota such as phytoplankton, zooplankton, macrophyte plants, macroinvertebrates, fish.
여름철 얕은 저수지의 중앙과 연안에서 동물플랑크톤 군집의 서식지 선택
정현기 ( Hyun Gi Jeong ),서정관 ( Jung Kwan Seo ),이혜진 ( Hae Jin Lee ),이원철 ( Won Choel Lee ),이재관 ( Jaek Wan Lee ) 한국환경생물학회 2010 환경생물 : 환경생물학회지 Vol.28 No.4
The Abundance of zooplankton was studied in the pelagic and the littoral zone in four shallow reservoirs along with the Nakdong river basin of S. Korea. In the pelagic zone, there was a higher zooplankton density (477.5±312.4 ind. L-1) than in the littoral zone during our study period (t=2.337, p?0.05). Overall, Rotifers were the most abundant group in the studied reservoirs. However, there are no significant correlations between the pelagic and the littoral zone in physical and chemical parameters. In the pelagic and the littoral zone, zooplankton density usually increased with increasing density of aquatic plants in the littoral zone. However, this study showed different trends. Although macrophyte abundance was higher in the littoral zone than in the pelagic zone, zooplankton abundance was higher in pelagic zone. Moreover, when macrophytes (Trapa japonica and Spirodela plyrhiza) covered the complete water surface of the reservoir, zooplankton abundance was higher. It appears that comparisons between the pelagic and the littoral zone give important cues on the selection of habitats by zooplankton. It is assumed that a higher density of aquatic plants does not always imply a higher density of zooplankton in the littoral zone. Furthermore, when the water surface was covered with aquatic plants, the zooplankton communities showed the highest density in the pelagic zone. These results imply that habitat selection of the zooplankton community (Rotifers) is influenced by aquatic plant density with an associated decrease in predation pressure during summer.
연구논문 : 주남저수지 유역의 오염원과 수질변동에 따른 식물플랑크톤 군집
이혜진 ( Hae Jin Lee ),서정관 ( Jung Kwan Seo ),정현기 ( Hyun Ki Jeong ),탁보미 ( Bo Mi Tak ),이재관 ( Jae Kwan Lee ) 한국환경과학회 2010 한국환경과학회지 Vol.19 No.11
This study presented seasonal changes of the phytoplankton community in Junam reservoir by pollution and water quality of the lake. The water storage of the reservoir is 5.3 million ton, most of which are being utilized for agricultural, industrial and residential purposes. The annual precipitation during the investigation period was 1,868.9 mm, increasing by 20% from the average annual level of 1,506.7 mm in 2009. The annual average water storage was 57.3%. It decreased during agricultural season and then increased again after monsoon rainfall. The loads of BOD were 3,799 kgday-1, and 81% of them came from livestock and household. The TN and TP loads were 1.164 kgday-1 and 170 kgday-1, respectively, and 76% of them came from livestock. We assessed water quality of the Junam reservoir using 17 variables. According to the result, the reservoir met the fourth grade, meaning slightly bad, because of high concentration of COD, SS and chlorophyll-a. Eutrophication assessment was conducted by revised Carlson`s Index (TSIm. Aizaki), and it was found that the entire lake was eutrophicated with high chlorophyll-a concentration all through the year, except during February to April and in July. A total of 76 phytoplankton species were identified from the samples. Among them, the largest number of species were Chlorophyceae with 33 species(43.4%), followed by Bacilliophyceae with 27 species(35.5%). Cyanophyceae with 8 species(10.5%), and Cryptophyceae with species(10.5%). The total cell number of phytoplankton was the highest in October(7,884 cells mL-1) among Cyanophyceae and Bacilliophyceae. The seasonal succession of Chlorophyceae(Chlamydomonas spp.), Cyanophyceae(Microcystis aeruginosa) and Cryptophyceae(Rhodomonas spp.) was observed during January to May, July to September and October to December respectively.