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Sb-첨가 SnO2 나노선 네트워크를 이용한 고속응답 가스센서
곽창훈 ( Chang Hoon Kwak ),우형식 ( Hyung Sik Woo ),이종흔 ( Jong Heun Lee ) 한국센서학회 2013 센서학회지 Vol.22 No.4
The Sb-doped SnO2 nanowire network sensors were prepared by thermal evaporation of the mixtures between tin and antimony powders. Pure SnO2 nanowire networks showed high sensor resistance in air (99 MΩ), similar gas responses to 4 diffferent gases (5 ppm C2H5OH, CO, H2, and trimethylamine), and very sluggish recovery speed (90% recovery time > 800 s). In contrast, 2 wt% Sb-doped SnO2 showed the selective detection toward C2H5OH and trimethylamine, relatively low resistance (176 kΩ) for facile measurement, and ultrafast recovery speed (90% recovery times: 6 -18 s). The change of gas sensing charactersitics by Sb doping was discussed in relation to gas sensing mechanism.
거푸집 패널이 부착된 2방향 중공슬래브의 뚫림 전단 안전성 평가
허무원 ( Moo-won Hur ),우형식 ( Hyung-sik Woo ),박정민 ( Jung-min Park ),강현욱 ( Hyun-wook Kang ),박태원 ( Tae-won Park ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 논문집 Vol.25 No.5
VPS는 중공재의 형상을 최적화 하고 중공재의 부상 및 작업하에 의한 이탈을 방지하는 기능을 가진 기존 중공슬래브공법이다. 본 연구에서는 기존연구에서 제안한 거푸집 패널이 부착된 중공슬래브(VPS)를 활용하여 플랫 플레이트의 뚫림전단 안전성을 검토하였다. 실험 결과, 가력점으로 부터 기둥 폭의 2.0배를 넘어 중공재를 배치한 VSPS 실험체는 기준 실험체에 대비 내력이 9.4%감소하였다. KBC2016에서 제시한 설계 값의 약 1.57배 이상의 강도 값을 나타내었다. 중공재를 배치한 VSPS 실험체가 전단파괴가 발생하기 전까지 기준 실험체 대비 강성의 변화는 없는 것으로 나타났다. 이는 휨 철근을 충분하게 배근하여 본 실험이 전단에 의해 파괴되고 있음을 알 수 있다. VPS(Void Plywood Slab System, VPS) has optimized the shape of the hollow material. In addition, it has a function to prevent the floating of the hollow material and the separation due to the working load. In this study, the punching shear capacity of flat plate was performed using Void Plywood Slab System with form work panel proposed in the previous study. As a result of the test, the strength of the VSPS specimen in which the hollow material was placed beyond 2.0 times the column width from the loading point was reduced by 9.4% compared to the reference specimen. However, the strength value was about 1.57 times higher than the design value suggested by KBC 2016. It was found that there was no change in stiffness compared to the reference specimen until shear failure occurred in the VSPS specimen in which the hollow material was placed. It can be seen that this experiment is being destroyed by shear as the flexural reinforcing bars are sufficiently reinforced.