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파로호에 설치된 인공식물섬 식생기반재의 공극수에서 세균 분포와 체외효소활성도
김용전,허재규,남종현,김인선,최경숙,최승익,안태석,Kim, Yong-Jeon,Hur, Jai-Kyou,Nam, Jong-Hyun,Kim, In-Seon,Choi, Kyoung-Suk,Choi, Seung-Ik,Ahn, Tae-Seok 한국미생물학회 2007 미생물학회지 Vol.43 No.1
생태계가 파괴된 파로호에 수초대를 복원하는 방법으로 rubberized coconut fiber를 식생기반재로 사용한 인공식물섬을 2003년 8월에 설치하였다. 인공식물섬 식생기반재에서는 식물이 자랄 수 있을 정도로 영양염이 농축되어 꽂창포(Iris ensata), 노랑 꽃창포(Iris pseudoacorus), 갈대(Phragmites communis)등 식재된 식물이 잘 자랐다. 이 과정에서 세균의 역할을 알아보기 위하여 2004년 4월부터 10월까지 2주 간격으로 총세균수, 활성세균수, ${\beta}-glucosidase$, phosphatase를 조사한 결과 인공식물성 식생기반재의 공극수에서 각각 평균 $28.6{\times}10^{6}\;cells/ml,\;22.7{\times}10^{6}\;cells/ml,\;452.9nM/L/hr,\;16381.9nM/L/hr$로 조사되어 파로호 호수물보다 각각 10배, 15배, 22배, 38배 높았다. 그리고 영양염류농도는 총인과 충질소가 식생기반재 공극수에서 각각평균 1.06 mg/L, 12.5 mg/L으로 조사되어 호수물보다 12배, 3배 높았다. 이 결과 인공식물섬 식생기반재에서 새로운 생태계가 만들어졌으며, 이 생태계에서 세균이 중요한 역할을 하여 빈-중영양상태의 호수물에서도 식물이 잘 자랄 수 있었다. For restoration of disturbed ecosystem in Lake Paro, artificial floating island (AFI) was installed. Even though the lake water was oligo-mesotrophic, the macrophytes, such as Iris ensata, Iris pseudoacorus, Phragmites communis were growing well in the rubberized coconut fiber media. For elucidating this process, total bacterial numbers, active bacterial numbers and exoenzymatic activities of ${\beta}-glucosidase$ and phosphatase of pore water of media and lake water were analyzed. The average of total bacterial numbers, active bacterial numbers and exoenzymatic activities of ${\beta}-glucosidase$ and phosphatase were $28.6{\times}10^{6}\;cells/ml,\;22.7{\times}10^{6}\;cells/ml,\;452.9nM/L/hr,\;and\;16381.9nM/L/hr$ which were 10, 15, 22 and 38 times higher than those of lake water, respectively. Moreover, the total phosphorus and total nitrogen concentration of media showed high values of 0.82 mg/L and 7.0 mg/L, respectively, while those of lake water 0.07 mg/L and 2.3 mg/L. This results suggest that the bacteria was playing an important role for restoration of disturbed ecosystem with newly created microbial ecosystem in media of artificial floating island.
Drop Tube Reactor 에서 석탄슬러리 가스화 특성
김용전(Yong Jeon Kim),이종민(Jong Min Lee),이재구(Jae Goo Lee),김재호(Jae Ho Kim),김정래(Jong Rae Kim),김상돈(Sang Done Kim) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.5
The effects of reaction temperature(1,200-1,500 ℃), oxygen%coal ratio(0.3-1.5), slurry concentration(50, 55, 58 wt.%), and coal type on gasification characteristics of coal-slurry in a drop tube reactor(0.05 m-I.D× 1 m-high) have been determined. The contents of H₂ and CO increase whereas, CO₂ decrease with increasing reaction temperature. Carbon conversion, sulfur conversion, product gas yield and concentrations of CO₂ increase with increasing O₂/coa1 ratio whereas, the product gas yield of H₂ and CO exhibit the maximum values at O₂/coal=0.6. With increasing slurry concentration, carbon conversion, sulfur conversion, total product gas yield increase, but the molar ratio of H₂/CO decrease. The longer residence time is required to gasify the higher rank coals.
내성천의 하도변화 분석 -영주댐 건설 이전(1970∼2011)-
김용전 ( Yong Jeon Kim ),이찬주 ( Chan Joo Lee ) 한국지형학회 2014 한국지형학회지 Vol.21 No.1
Channel change is one of the main themes of fluvial geomorphology. Foreign previous studies have made under this theme from different temporal views. In contrast, few domestic studies were made due to limitation of data. By using the available data, channel change along the Naesung river was investigated, which might be caused by national development in industry and watershed change during last four decades. Recently, the Naesung river have been a matter of public concern due to anticipated negative channel change after Youngju dam impoundment. Thus, objective and scientific research should be made. On this background, this study was conducted. Change in riverbed material and channel forms planform, longitudinal and cross-sectional morphology were analyzed. Transition in land surface cover along the river was also examined using the aerial photos. Alteration was mainly focused along the downstream reach of the Naesung river. Main channel was generally narrowed with vegetation encroachment. Riverbed was lowered both in the downstream and upstream reaches. Channel width.