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편재하중을 (偏載荷重) 받는 연약지반속의 벽강관식 (壁鋼管式) 안벽의 안정 해석
홍원표(Won Pyo Hong),이우현(Woo Hyun Lee),남정만(Jeong Man Nam),한중근(Jung Geun Han) 한국강구조학회 1990 韓國鋼構造學會誌 Vol.2 No.4
Recently quaywalls are constructed in soft soil by placing steel-pipe piles at close intervals in a row. Because of complexity of the soil-pile interaction mechanism, the usual analytical methods, which are applied to analyze behaviors of common sheetpiles, can not be applied for analysis of the quaywalls. In order to establish a reasonable analytical method for the quaywalls constructed by steel-pipe piles, a couple of ideas was introduced in this study. For estimating lateral earth pressure acting on the quaywalls constructed by steel-pipe piles, the concept of the $quot;passive pile$quot; was introduced since the steel pipe piles was subjected to plastic lateral soil flow. The soil reactions against pile movements were considered by separating the soil modulus into two for above and below potential slip surfaces. The soil moduls above potential slip surfaces could be decided according to the slope deformability. On stability analysis of slope with quaywalls constructed by steel-pipe sheetpiling, the stabilities of both slope and piles should be considered simultaneously. Finally, the behavior of steel pipe piles was analysed by use of the proposed analytical method.
광량과 온도 변화에 따른 고추 ( Capsicum annuum L. ) 잎 광계 2의 광억제
이혜연(Hae Yeon Lee),남정원(Jeong Won Nam),홍영남(Young Nam Hong) 한국식물학회 1995 Journal of Plant Biology Vol.38 No.4
Photoinhibition of photosystem (PS) Ⅱ was induced in primary leaves of 25 day-old peppers grown 100 μ㏖·m^-2·s^-1, at 25℃. The modulation of PSⅡ functionality in vivo was induced by varying both irradiance (0-3000 μ㏖·m^-2·s^-1) and duration (0-70 min) of light treatment. The functionality of PSⅡ was investigated in terms of photochemical efficiency of PSⅡ (Fv/Fm) and quantum yield of O_2 evolution, and expressed as a function of photon exposure [㏖ photons·m^-2, the product of irradiance and duration of light treatment (Bell and Rose, 1981)]. Contrary to the linear decline of Fv/Fm ratio showing 50% decreases by absorption of 10 ㏖ photons·m^-2, quantum yield of O_2 evolution decreased biphasically with increasing photon exposure, showing 50% decreases by absorption of 5.5 ㏖ photons·m^-2. Treatment of low temperature at 15℃ for 30 min alone did not affect the functionality of PSⅡ, but high temperature (45℃) significantly inactivated PSⅡ activity. However, when leaves of pepper were subjected to low or high temperature in the presence of light, PSⅡ was substantially photoinactivated. These results suggest the presence of different photoinhibitory mechanisms at low and high temperature.
전도성고분자-CNT 복합체를 활성물질로 사용한 빛을 일에너지로 바꾸는 동력장치 제작에 관한 연구
김세진 ( Sae Jin Kim ),김정보 ( Jeong Bo Kim ),박준호 ( Joon Ho Park ),임연주 ( Youn Joo Lim ),홍남정 ( Nam Jeong Hong ),정규관 ( Kyu Kwan Zong ) 전북대학교 과학교육연구소 2014 科學敎育論叢 Vol.39 No.1
본 연구에서는 CNT에 polypyrrole을 코팅시켜 새로운 흡광체를 제조하고 이를 PDMS를 기반으로 한 추진체의 후면에 부착시켜 추진체를 제작하였다. 제작된 추진체를 물위에 띄워 놓고 집광된 빛을 추진체 흐면의 활성물질에 투사하여 물과 추진체 사이에 표면장력 차이를 유발하여 추진체가 운동하는 것을 확인하였다. SEM을 이용하여 제조한 추진 활성 물질의 나노구조가 확인되었다. 이 연구에서 추진의 모양, 추진체의 크기, 추진체의 종류, 발수제의 첨가 유무에 따라 추진체의 운동 속도가 비교 실험 되었다 추진체는 배 모양의 유선형, 크기는 소형, 추진체의 종류에서는 CNT+PPY의 복합소재, 그리고 반수제가 첨가된 것이 각각 추진 속도가 더 빠른 것으로 확인되었다. 향후 흡광제의 개량을 통해 더욱 에너지 효율이 뛰여난 물질이 개발되고 물질의 안정성과 효율, 그리고 추진체의 방향조절이 최적화된다면 현실에 적용되어 신재생 에너지의 한축을 이룰 수 있다는 가능성이 제기되었다. In this study, new light dbsorbing CNT-polyprrole composites was synthesized by coating CNT with polypyrrole and driving devides was constructed by attaching the composites on the back side of PDMS based shuttle, The model shuttle was floated on the water and the concentrated light by a focusing lcns was irradiated on the surface of the composite of the shuttle which brought surface tension mediated conversion of light to work. The nano structure od the composites used as an active material was characterzed by SEM, Drving speeds the model shuttle were compared according to its shape size and content of superhydrophobic material. The model shuttle equipped with fish-shape, small size, and CNT-polyprrole composite Was found to move the fastest among them. Development of more energy-efficient light absorbing composite and control of steering the direction of the shuttle are needed for further improvement of thc mocel shuttle.