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이온교환법에 의한 고분자전해질형 연료전지용 전극의 제조와 특성 고찰
이주성,박수길,오태영,이홍기,심중표 한양대학교 에너지.환경기술연구소 1995 에너지·環境技術論文集 Vol.2 No.-
고분자전해질형 연료전지용 전극의 백금 이용률을 높이기 위해 촉매제조시 이온교환법을 이용하여 백금을 carbon에 담지하고 이에 따른 전지성능변화를 고찰하였다. 전극제조시 Nafion이 첨가되지 않은 경우 이온교환양이 증가함에 따라 전기화학적인 활성이 증가하여 전지성능이 증가하였다. 전극제조시 Nafion이 첨가된 경우, Nafion첨가량이 증가함에 따라 전지성능은 증가하였는 데 Nafin첨가에 의해 이온교환되지 않은 백금이 전기화학적인 활성을 가지게 되어 전지성능은 증가하였다. To improve platinum utilization of PEMFC(Proton exchange membrane fuel cell) electrode, in preparing catalytic powder, platinum was impregnated on carbon by ion exchange method and its cell performance was investigated. When electrode was prepared without adding Nafion solution, as Nafion pre-impregnated amount was increased, electrochemically active area and cell performance was increased. When electrode was prepared with Nafion solution, increase of adding Nafion amount was improvement of cell performance. By adding Nafion at preparation of electrode, non ion-exchange platinum was shown electrochemical activity, cell performance was improved.
이온교환법에 의한 고분자 전해질형 연료전지용 전극 제작과 특성 평가
심중표,조상필,이주성,오태영 한양대학교 에너지·환경기술연구소 1997 에너지·環境技術論文集 Vol.3 No.-
The platinum catalyst for polymer electrolyte membrane fuel cell was prepared by ion exchange method. In the case of increasing loading content of catalyst by repeating ion-exchange of platinum, previously Nafion content was fixed as 10 wt% for the preparation of catalyst powder. When the platinum loading amount on carbon were 5, 10, and 20 wt%, the particle sizes of platinum were 75, 85, and 113Å, respectively. The performance of 20 wt% platinum-loaded electrode was better than other cases. As the loading amount of catalyst was increased, the particle size of platinum was enlarged and the surface area was decreased. Then mass activity was gradually decreased. And as the more and more higher pressure was taken, mass activity was also gradually increased.
노닐페놀을 주사한 조피볼락의 간장 cytochrome P450과 EROD의 반응
전중균 ( Joong Kyun Jeon ),이지선 ( Ji Seon Lee ),손영창 ( Young Chang Sohn ),심원준 ( Won Joon Shim ),정지현 ( Jee Hyun Jeung ),홍경표 ( Gyong Pyo Hong ),김병기 ( Pyong Kih Kim ),한창희 ( Chang Hee Han ) 한국환경생물학회 2004 환경생물 : 환경생물학회지 Vol.22 No.1
비이온성 계면활성제로 많이 쓰이는 알킬페놀류의 하나인 노닐페놀(nonylphenol)이 해산어류에게 미치는 영향을 조사하려고 주요 양식어종인 조피볼락에게 복강주사로 10 및 25 mg kg^(-1)을 1회 투여하였다. 한편 용제인 DMSO만을 주사한 sham구를 설정하여 비교하였다. 주사 후 7일간 간중량지수(hepatosomatic index)의 변화를 조사하였고, 또한 간장 미크로좀 중 대표적인 약물대사효소인 cytochrome P450 (CYP) 농도와 ethoxyresorufin deethylase (EROD) 활성의 변화도 측정하였다. 그 결과, 고농도(25 mg kg^(-1)) 주사구에서는 HSI가 감소 하였는데,이것은 NP가 간장에 독성이 있다는 것을 보여준다. 한편, 약물대사효소 중 CYP농도는 유도되었지만 EROD활성은 저해되는 경향을 보였다. 이번에 주사한 농도는 우리나라 연근해 해수 중의 NP농도에 비해 매우 높은 수준이지만,본 실험에서는 NP가 조피볼락에게 간장 독성을 보였고, 간장의 약물대사효소에도 영향을 미친다는 것을 확인할 수 있었다. Nonyphenol (NP) used actively as non-ionic surfactant is classified as one of most potent endocrine disrupting chemicals. Effects of NP on mixed function oxygenase (MFO) system in rockfish (Sebastes schlegeli) were investigated for seven days after intraperitoneal injection (10 and 25 mg kg^(-1)). Hepatosomatic index (HSI) of fishes exposed to NP of 25 mg kg^(-1) was significantly reduced compared to those in control group. NP exposure enhanced cytochrome P450 levels in the fish liver, while 7-ethoxyresorufin-O-deethylase (EROD) activity was inhibited. NP exposure levels in this study were much higher than those found in the coastal environment of Korea. Effects on HSI and liver MFO system, which is involved in steroid hormone metabolism, imply that NP may influence on reproduction of fish by not only hormone receptor mediated response but also through effects on the MFO system.
정명표 ( Myung Pyo Jung ),허지나 ( Jina Hur ),박혜진 ( Hye Jin Park ),심교문 ( Kyo Moon Shim ),안중배 ( Joong Bae Ahn ) 한국농림기상학회 2015 한국농림기상학회지 Vol.17 No.2
본 연구에서는 중국의 동북지역 기후자료를 수집하여 DB를 구축하고, 이들 기후자료를 활용하여 농업기후지대를 구분함으로써 대상지역의 농업기상특성 분석의 기초정보를 확보하고자 하였으며, 국외의 주요 곡물 수출국의 기상관측정보를 수집, 분석, 제공할 수 있는 체계를 구축하고자 하였다. 중국 동북지역 농업기후지대를 구분하기 위하여 미국 항공우주국의 전 지구 모델링 및 동화 센터의 1979-2010년까지 32년 동안의 월별 기온 및 강수량 자료와 Weather Research and Forecasting(WRF) 모형의 동아시아 영역의 해발고도와 식물비 자료를 활용하였다. 중국 동북지역은 해발고도는 200m 이하, 200-800m, 800m 이상, 식물비 60%, 연평균 기온은 0oC, 최난월 기온은 22oC,연평균 강수량 700mm를 기준으로 22개 농업기후지대로 구분되었다. 22개 농업기후지대는 연평균기온은 3.4oC, 강수량 613.2mm, 일사량 4,414.2MJ/m2의 기후특성을 보였다. This study was conducted to classify agro-climatic zones in Northeast district of China. For agroclimatic zoning, monthly mean temperature and precipitation data from Global Modeling and Assimilation Office (GMAO) of National Aeronautics and Space Administration (NASA, USA) between 1979 and 2010 (http://disc.sci.gsfc.nasa.gov/) were collected. Altitude and vegetation fraction of East Asia from Weather Research and Forecasting (WRF) were also used to classify them. The criteria of agro-climatic classification were altitude (200 m, between 200-800 m, 800 m), vegetation fraction (60%), annual mean temperature (0oC), temperature in the hottest month (22oC), and annual precipitation (700 mm). In Northeast district of China, mean annual temperature, annual precipitation, and solar radiation were 3.4oC, 613.2 mm, and 4,414.2 MJ/m2 between 2009 and 2013, respectively. Twenty-two agro-climatic zones identified in Northeast district of China by metrics classification method, from which the map of agro-climatic zones for Northeast district of China was derived. The results could be useful as information for estimating agro-meteorological characteristics and predicting crop development and crop yield of Northeast district of China as well as those of North Korea.
Rifampicin 내성 결핵균의 검출에 있어서 PCR-line Probe법과 PCR-SSCP법의 비교
김호중 ( Ho Joong Kim ),서지영 ( Gee Young Suh ),정만표 ( Man Pyo Chung ),김종원 ( Jong Won Kim ),심태선 ( Tae Sun Shim ),최동철 ( Dong Chull Choi ),권오정 ( O Jung Kwon ),이종헌 ( Chong H. Rhee ),한용철 ( Yong Chol Han ) 대한결핵 및 호흡기학회 1998 Tuberculosis and Respiratory Diseases Vol.45 No.4