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Diethylnitrosamine에 의하여 유발된 마우스 간 종양의 CYP1A2 메틸화와 발현
진보환(Bohwan Jin),오새진(Saejin Oh),류덕영(Doug-Young Ryu) 한국환경성돌연변이발암원학회 2006 한국환경성돌연변이·발암원학회지 Vol.26 No.3
Cytochrome P450 1A2 (CYP1A2) is a xenobiotic metabolizing enzyme that is tissue-specifically expressed in the mammalian liver. In this study, the extent of CYP1A2 promoter methylation was analyzed to determine its potential role in the regulation of CYP1A2 in diethylnitrosamine (DEN)-induced mouse liver tumors. CYP1A2 mRNA was under-expressed about three fold in DEN-induced liver tumors compared to agematched control livers. The CYP1A2 promoter was hypermethylated in DEN-induced liver tumors compared to controls, especially in a promoter domain close to the coding region. These results suggest that promoter methylation is involved in the regulation of CYP1A2 in mouse liver tumors.
3차원 위치좌표를 이용한 대형 구조물 양중을 위한 계측 - 평가 시스템
이명호,천성철,오보환,Lee, Myung Ho,Chun, Sung Chul,Oh, Bohwan 한국강구조학회 2009 韓國鋼構造學會 論文集 Vol.21 No.4
일반적으로 대형 지붕구조나 초대형 보와 같은 대형 구조물을 양중하는 방법은 유압잭이 이용된다. 또한, 양중시 안전을 위하여 CCTV를 이용하여 각 포인트에 설치된 줄자를 모니터링하여 레벨체크를 수행하고, 상대 변위가 기설정된 한계를 벗어나면 유압잭을 정지하고 상대변위를 수동으로 조정한 후에 양중을 수행하였다. 그러나, 이러한 종래의 양중 방법은 CCTV를 육안으로 확인하여 레벨을 체크하기 때문에 정확도가 높지 않았고, 실시간 계측은 현실적으로 불가능하였다. 이러한 문제를 개선하기 위하여 자동추적형 토탈스테이션, 레이저 거리계, 데이터로거, 변형도게이지 등을 이용하여 대형 구조물 양중시 적용할 수 있는 계측-평가 시스템 구축하였다. 시스템을 구현하기 위한 프로그램 작성 후 실험실에서 시연을 통해 계측-평가 데이터의 정확성 및 활용 가능성을 평가하였으며, 안정적인 데이터 취득 및 연산을 통해 적용성이 검증되었다. Heavy structures such as large roof structures and superbeams were lifted using hydraulic jacks. Moreover, member verticality and horizontality checks were performed at every construction stage to monitor the measuring tapes for their structural safety, using CCTV. When the relative displacement exceeded the predetermined limit, the hydraulic systems were terminated. After adjusting the relative displacement manually, lifting was resumed. The accuracy of the relative displacement was found not to be reliable, however, due to eye check using CCTV, and it took a long time due to manual adjustment. Moreover, real-time monitoring was impossible. To address these problems, the monitoring-evaluation system for the stable lifting of heavy structures was proposed, using the total station of the automatic-target-recognition type, laser-distance-measuring devices, a data logger, a strain gauge, and others. After developing a program for the operation of the system and for the acquisition of data, a mock-up test was conducted in a large-scale structural laboratory to evaluate the accuracy and applicability of the system. The stable acquisition and applicability of data was confirmed in the test.