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논 관개수, 담수 및 유출수의 용존인과 총인 농도 변화
최동호,조소현,정재운,박현규,최우정,윤광식,김영석,Choi, Dongho,Cho, Sohyun,Jung, Jaewoon,Park, Hyunkyu,Choi, Woojung,Yoon, Kwangsik,Kim, Youngsuk 한국물환경학회 2017 한국물환경학회지 Vol.33 No.4
In order to understand the characteristics of phosphorus in the paddy field, this study analyzed $PO_4-P$ and T-P concentrations of irrigation water, flooding water, and runoff from 2008 to 2010. The variation of phosphorous form within hydrologic cycle around the rice paddy field was investigated using the ratio of $PO_4-P$ to TP. In addition, the correlation between pH, EC, and DO in flooding water was analyzed and the factors affecting phosphorus form in paddy field were investigated. The concentration of T-P in flooding water was high during the survey period, and the concentration of T-P in runoff was assumed to be decreased by dilution due to irrigation and rainfall. On the other hand, the ratio of $PO_4-P$ to T-P was lower in flooding water than those of irrigation water and runoff, which was interpreted to be due to the fact that the phosphorus fertilizer was applied in the paddy field but the adsorption was rapidly occurred to the paddy field by the soil. The similar proportions of $PO_4-P$ to T-P in flooding water and runoff suggest that the form of phosphorus outflowed from the paddy is influenced by the form of phosphorus in the flooding water of paddy field. In addition, DO concentration in flooding water showed negative correlation with the concentrations of $PO_4-P$ and T-P. The effort to survey frequent irrigation water quality data is required for the analysis of phosphorus behavior in the paddy water system since concentration of phosphorous and DO in irrigation water would influence rhe form of phosphorous in flooding water and subsequent runoff.
최동호,이동환,정성철,Choi, Dongho,Lee, Dong Hwan,Jung, Sung-Chul 대한유전성대사질환학회 2005 대한유전성대사질환학회지 Vol.5 No.1
Orthotopic liver transplantation is the treatment of choice for inherited metabolic diseases. However, the supply of donor organs is limiting and therefore many patients cannot benefit from this therapy. In contrast, hepatocytes can be isolated from a single donor liver. They can be transplanted into several recipients, and this procedure may help overcome the shortage of donor livers. A great deal of work with animal models indicates that hepatocytes transplanted into the liver or spleen can survive, function, and participate in the normal regenerative process. Recent clinical studies suggest that hepatocyte transplantation may be useful for bridging patients to whole organ transplantation and for providing metabolic support during liver failure and for replacing whole organ transplantation in certain inherited metabolic diseases. Nowadays, hepatocytes from various stem cells have been regarded as an another cell source for treatment of inherited metabolic diseases. Although cell therapy using stem cells for inherited metabolic disease patient has been accepted only as an experimental trial yet, hepatocytes from stem cells can solve a lot of obstacles in the treatment of inherited metabolic diseases.
강우시와 비강우시 BOD 유출 특성 조사 및 원단위 평가
최동호,조소현,황태희,김영석,정재운,최우정,박현규,윤광식,Choi, Dongho,Cho, Sohyun,Hwang, Taehee,Kim, Youngsuk,Jung, Jaewoon,Choi, Woojung,Park, Hyunkyu,Yoon, Kwangsik 한국물환경학회 2017 한국물환경학회지 Vol.33 No.5
The biologic Oxygen Demand (BOD) is a reliable and generally accepted indicator of water pollution by organic pollutants. Accordingly, estimation of BOD export from paddies carries important implications fwith regard to water management in rural areas. In this study, hydrology and BOD concentration were monitored during the period 2008 through 2012, in an effort to understand the characteristics of BOD export from paddy fields. The findings demonstrated that BOD load by rainfall above 50 mm. occupied about 50 % of total load, whereas the load by less than ten mm. rainfall occupied about 29 % of the total load during periods of stormy activity. It therefore seems that it could be possible to reduce the BOD load up to 29 % during storm periods, when drainage control conducted for rainfall less than ten mm.(an amount which is relatively easy to manage). The documented mean loads of storm and non-storm were $17.1kg\;ha^{-1}\;yr^{-1}$ and $11.2kg\;ha^{-1}\;yr^{-1}$, respectively. The BOD load during the significant rainfall period was similar to the renewed unit load by NIER (2014). However, there were substantial differences between unit load and actual load when the non-storm load was incorporated into the BOD load estimation from paddy fields. In view of the foregoing, it is felt that, the non-storm load needs to be further considered and managed for the successful implementation of Total Maximum Daily Load (TMDL) program.
최동호,김대회,Choi. Dongho,Kim. Daehoi 한국방재학회 2012 한국방재학회논문집 Vol.12 No.4
건축물은 화재시 그 피해를 최소화하기 위해 건축물 주요 구조부를 일정 수준의 내화구조로 시공하고 있다. 현재 국내에서는 이러한 주요 구조부의 내화성능을 정부에서 확인하여 인정한 법정 내화구조를 규정하고 있으나 외국에 비하여 내화성능 및 구조의 구분없이 일률적으로 내화성능을 규정하고 있으며, 이경우도 규정된 후 상당한 시일이 경과되어 최근에 적용되는 건축재료 및 공법기술을 적절히 수용하지 못하고 있는 실정이다. 이에 따라 현재의 법정내화구조에 대한 성능확인 등을 통한 내화성능을 재설정할 필요가 있으며, 이에 본 연구에서는 국내 법정내화구조중 벽체 구조를 대상으로 내화성능을 평가한 후 각 구조별로 법정내화구조를 세분화한 기초자료를 제시하였다. To minimize the damages under fire conditions in buildings, the main structural members of buildings shall be fire-resistance-rated structural members. The relevant authority specifies the prescriptive fire-resistance-rated structural members which have 3-hour fire rating equally without any classification in building laws at present unlike foreign countries. But, these prescriptive fire-resistance-rated structural members don`t properly reflect the recent construction materials and the technical development of methods of construction as a long time has passed. Consequently, it is needed to specify so that the fire resistance performance of structural members can be departmentalized according to the detail design and applied part and to improve the relevant system based on the test materials of fire-resistance-rated structural members economically and efficiently. This study was intended to give the fundamental materials that prescriptive fire-resistance-rated walls are departmentalized as each structure by evaluating the fire resistance performance of prescriptive fire-resistance-rated walls.
이산화탄소 이용 열화학공정을 통한 가축분뇨 폐기물의 합성가스 전환
최동호 ( Dongho Choi ),권일한 ( Eilhann E. Kwon ) 한국폐기물자원순환학회(구 한국폐기물학회) 2021 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2021 No.-
본 연구는 가축분뇨 처리 방법으로 열화학공정을 이용하여 가축분뇨 폐기물의 합성가스 및 바이오차 전환 연구를 진행하였다. 또한, 이산화탄소를 가축분뇨 폐기물 열분해 공정에 공동 반응물로 이용하였다. 가축분뇨 폐기물 열분해에서, 가축분뇨 폐기물의 열분해로부터 발생한 휘발성 유기화합물이 이산화탄소와의 가스상반응을 통해 일산화탄소가 생성되었다. 이 공정에서 이산화탄소가 산소를 추가적으로 제공하는 역할을 하였다. 이 이산화탄소의 가스상반응 메커니즘은 가축분뇨 폐기물의 가치화 공정 중 이산화탄소가 원료로 사용될 수 있다는 가능성을 보여준다. 그럼에도 불구하고, 실험적으로 결정된 이산화탄소의 가스상 반응이 진행할 수 있는 온도가 510℃에서 진행되고, 가축분뇨 폐기물로부터 발생한 대부분의 휘발성 유기화합물이 합성가스로 전환되는 가스상 반응의 반응속도가 빠르지 않았다. 이러한 점에서, 가스상 반응의 반응속도를 향상시키기 위해, 본 연구는 가축분뇨 폐기물로부터 발생한 바이오차를 열분해공정에서의 촉매로 이용하였다. 이산화탄소 조건의 촉매열분해에서, 가축분뇨 폐기물 기반 바이오차는 가스상 반응의 반응속도를 향상시키는데 중요한 역할을 하였다. 가스상 반응을 통한 합성가스 전환은 바이오차의 양에 비례하여 증가하였다. 무촉매 열분해와 비교하였을 때, 가축분뇨 바이오차 이용 촉매열분해는 합성가스 전환이 3배까지 증가한 것을 보였다.