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유한요소법에 의한 탄소섬유시트와 콘크리트의 부착특성 해석
송성용 ( Song Sung-yong ),金刀督純 ( Kanetoh Masayoshi ),최근도 ( Choi Kun-do ),이한승 ( Lee Han-seung ),유영찬 ( Rui Young-chan ),이리형 ( Lee Ri-hyung ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
The effect of reinforced concrete member strengthened with carbon fiber sheet(CFS) is relied on bond property between CFS and concrete. In order to investigate the influence of bond failure, this study is carried out tensile-shear analysis by unite element method. When the bond shear stress is 24kgf/㎠, analysis results become well. It is concluded that the effective bond length is 20cm. The crack load and bond failure load is made clear by bond shear stress.
환경방사선감시기의 NaI(Tl) 검출기를 이용한 조사선량률 결정방법
지영용,이완로,최상도,정근호,강문자,최근식,Ji, Young-Yong,Lee, Wanno,Choi, Sang-Do,Chung, Kun Ho,Kang, Mun Ja,Choi, Geun-Sik 한국방사성폐기물학회 2013 방사성폐기물학회지 Vol.11 No.3
The energy band and the G-factor method were compared to determine the exposure rate from the measured spectrum using a NaI(Tl) scintillation detector. First, G-factors of a 3"${\Phi}X3$" NaI(Tl) detector mounted to a EFRD 3300, which means the environmental radiation monitor, in Korea Atomic Energy Research Institute (KAERI) were calculated for several directions of incident photons through the MCNP modeling, and the optimum G-factor applicable to that monitor was then determined by comparing the results both the energy band method and the G-factor method. The results for these spectrometric determinations were also compared with the dose rate from a HPIC radiation monitor around a EFRD 3300. The measured value at the EFRD 3300 based on a 3"${\Phi}X3$" NaI(Tl) detector was $7.7{\mu}R/h$ and its difference was shown about $3{\mu}R/h$, when compared with the results from a HPIC radiation moditor. Since a HPIC is known to be able to measure cosmic rays with the relatively high energy, the difference between them was caused by cosmic rays which were not detected in a 3"${\Phi}X3$" NaI(Tl) detector.