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황지훈,장정현,양경석,최재혁,Hwang, Ji-Hoon,Jang, Jeong-Hyun,Yang, Kyeong-Seok,Choi, Jae-Hyouk 한국교육시설학회 2012 敎育施設 Vol.19 No.4
Recently large scale earthquake s are occurred around the world following the damage of buildings. So the interest of preparing for earthquake seismic design and seismic performance has becoming high. School buildings are though used for educational purpose; they are also used as emergency shelter for local residents during earthquake disaster. However, the current seismic design ratio of our country (Korea) is 3.7% and if massive earthquake is occurred it follows a serious damage. In order to overcome this situation, seismic performance evaluation is carried out for existing school building and an accurate and appropriate seismic retrofit is required based on performance evaluation to upgrade the existing school buildings. In this paper, nonlinear static analysis on existing school buildings for ATC-40 and FEMA-356 are carried out using the capacity spectrum method to evaluate seismic performance and to determine the need for retrofitting. In addition, after reinforcement to verify the effect of retrofit enhance the seismic performance is applied the seismic performance evaluation is carried out to verify the effect of seismic retrofit time history analysis using nonlinear dynamic analysis is also performed and nonlinear behavior of earthquake load of seismic retrofit of structures was also investigated.
다양한 질소화합물에 대한 황산화미생물 바이오센서의 응답 특성
황지훈 ( Ji Hoon Hwang ),강우창 ( Woo Chang Kang ),신범수 ( Beom Soo Shin ),채규정 ( Kyu Jung Chae ),오상은 ( Sang Eun Oh ) 한국환경농학회 2014 한국환경농학회지 Vol.33 No.4
BACKGROUND: Run off from agricultural sites contaminates water bodies with nitrogen which is toxic and causes eutrophication when excessively accumulated. Hence, the interest in monitoring nitrogen toxicity in aquatic environment has been continuously increasing. METHODS AND RESULTS: To detect a real time toxicity of various nitrogen compounds, we applied biomonitoring method (biosensor) based on sulfur-oxidizing bacteria (SOB). The toxicity biomonitoring test was conducted in semi-continuous mode in a reactor filled with sulfur particles (2∼4 mm diameter) under aerobic condition. Relative toxicity was simply determined by measuring the change in electrical conductivity (EC). Various nitrogenous compounds at different concentrations were evaluated as a potential toxic substance. Nitrite was found to be very toxic to SOB with a 90% inhibition even when the concentrationas low as 3 mg/L. However, nitrate and ammonia have any inhibitory effect on SOB’s activity. CONCLUSION: The biosensor based on SOB responded sensitively to nitrite even at substantially low concentrations. Therefore, it can be used as a reliable biological alarm system for rapid detection of contaminants due to its simplicity and sensitive nature.
수질 환경 분야PW-17 : 반응시간에 따른 SOB 바이오센서의 아질산성질소(NO2 --N) 농도별 독성탐지능력 평가
황지훈 ( Ji Hoon Hwang ),오상은 ( Sang Eun Oh ),신범수 ( Beom Soo Shin ) 한국환경농학회 2014 한국환경농학회 학술대회집 Vol.2014 No.-
지구상에 있는 물중에서 인간이 수자원으로 사용할 수 있는 물은 극히 적은 양에 불과하다. 하지만 생활수준이 높아지면서 물의 이용량은 점차 증가하고, 그에 따라 수질오염도 증가했다. 수질이 오염되었을 때, 그 피해를 최소화하고자 다양한 종류의 독성탐지장치가 개발이 되었고 널리 사용되고 있다. 수중의 독성을 탐지하기 위하여 황산화미생물을 이용한 새로운 형태의 생태독성탐지방법이 연구되었다. 황산화미생물이 산소 존재 하에서 황입자를 산화하여 황산을 만들게 되고 이는 EC의 증가 및 pH의 감소를 가져온다. 이번 실험에서는 반응시간에 따른 미생물 활성 및 그에 따른 전기전도도 변화를 관찰하고 각 반응시간 별 조건에 여러 농도의 아질산성질소가 유입되었을 경우의 독성여부를 비교하여 어느 반응시간의 조건에서 독성여부의 판별이 가장 신속한지 알아보고자 하였다. 아질산칼륨(KNO2)을 이용하여 아질산성질소를 각각 0.5, 1, 2, 3, 5 mg/L 로 제조하였고, 유입수가 유입된 후 유출되기까지의 반응시간은 각각 10, 15, 20, 30 분으로 하였다. 이 실험의 결과 2, 3, 5 mg/L 의 아질산성질소의 경우 모든 반응시간에서 독성이 검출되었다. 그리고 0.5 mg/L 의 경우는 모든 반응시간에서 독성이 검출되지 않았다. 하지만 1 mg/L 의 경우에는 30분과 20분 반응했을 때는 독성도가 나타나지 않았으나, 15분과 10분 반응했을 경우 독성이 검출이 되었다. 이를 통해 황산화미생물을 이용한 독성탐지장치의 반응시간은 짧을수록 더 민감하게 독성 물질을 검출 할 수 있을 것이라고 판단하였다.
황지훈(Hwang, Ji-Hoon),장정현(Jang, Jeong-Hyun),양경석(Yang, Kyeong-Seok),최재혁(Choi, Jae-Hyouk) 한국교육시설학회 2012 敎育施設 Vol.19 No.4
Recently large scale earthquake s are occurred around the world following the damage of buildings. So the interest of preparing for earthquake seismic design and seismic performance has becoming high. School buildings are though used for educational purpose; they are also used as emergency shelter for local residents during earthquake disaster. However, the current seismic design ratio of our country (Korea) is 3.7% and if massive earthquake is occurred it follows a serious damage. In order to overcome this situation, seismic performance evaluation is carried out for existing school building and an accurate and appropriate seismic retrofit is required based on performance evaluation to upgrade the existing school buildings. In this paper, nonlinear static analysis on existing school buildings for ATC-40 and FEMA-356 are carried out using the capacity spectrum method to evaluate seismic performance and to determine the need for retrofitting. In addition, after reinforcement to verify the effect of retrofit enhance the seismic performance is applied the seismic performance evaluation is carried out to verify the effect of seismic retrofit time history analysis using nonlinear dynamic analysis is also performed and nonlinear behavior of earthquake load of seismic retrofit of structures was also investigated.