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유한요소법을 이용한 지진하중을 받는 교량의 구조물-유체-지반 동적 상호작용해석
류희룡,박영택,이재영,You, Hee-Yong,Park, Young-Tack,Lee, Jae-Young 한국농공학회 2008 한국농공학회논문집 Vol.50 No.4
In construction facilities such as bridges, the fluid boundary layer(or water film) is formed at the structure-soil interface by the inflow into the system due to rainfall or/and rising ground-water. As a result, the structure-soil interaction(SSI) state changes into the structure-fluid-soil interaction(SFSI) state. In general, construction facilities may be endangered by the inflow of water into the soil foundation. Thus, it is important to predict the dynamic SFSI responses accurately so that the facilities may be properly designed against such dangers. It is desired to have the robust tools of attaining such a purpose. However, there has not been any report of a method for the SFSI analyses. The objective of this study is to propose an efficient method of finite element modelling using the new interface element named hybrid interface element capable of giving reasonable predictions of the dynamic SFSI response. This element enables the simulation of the limited normal tensile resistance and the tangential hydro-plane behaviour, which has not been preceded in the previous studies. The hybrid interface element was tested numerically for its validity and employed in the analysis of SFSI responses of the continuous bridge subjected to seismic load under rainfall or/and rising ground-water condition. It showed that dynamic responses of the continuous bridge resting on direct foundation may be amplified under rainfall condition and consequently lead to significant variation of stresses.
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류희룡,이재영,박영택,You, Hee-Yong,Lee, Jae-Young,Park, Young-Tack 한국농공학회 2006 한국농공학회논문집 Vol.48 No.6
The finite element method is a practical tool to compute the response of the irregularly layered soil deposit to the base-rock motions. The method is useful not only in estimating the interaction between the structure and the surrounding soil as a whole and the local behavior of the contacting area in detail, but also in predicting the resulting behavior of the superstructure affected by such soil-structure interactions. However, the computation of finite element analysis is marched in the time domain (TD), while the site response analysis has been carried out mostly in the frequency domain (FD) with equivalent linear analysis. This study is intended to compare the results of the TD and FD analysis with focus on the peak response accelerations and the predominant frequencies, and thus to evaluate the applicability and the validity of the finite element analysis in the site response analysis. The comparison shows that one can obtain the results very close to that of FD analysis, from the finite element analysis by including sufficiently large width of foundation in the model and further by applying partial mode superposition. The finite element analysis turned out to be well agreeing with FD analysis in their computed results of the peak acceleration and the acceleration response spectra, especially at the surface layer.
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최영하(Young Hah Choi),강남준(Nam Jun Kang),박경섭(Kyoung Sub Park),전희(Hee Chun),조명환(Myeong Whan Cho),엄영철(Yeong Cheol Um),류희룡(Hee Yong You) 한국원예학회 2009 원예과학기술지 Vol.27 No.1
착과방법이 방울 토마토 생육, 수량 및 과실 품질에 미치는 영향을 구명하고자, 품종은 ‘꼬꼬’와 ‘산체리/스페셜’을 이용하였고, 착과방법은 벌 수정, 진동수분, 토마토톤 처리를 하였다. 두 품종 모두 착과처리 방법 간에는 생육 및 수량차이가 없었다. 종자수, 과육률 및 과즙률 함량은 유의한 차이가 있었으나 과피의 경도나 압축강도 등은 차이가 없었다. 당도, 산도, L*a*b* 표색계 값 등도 차이가 없었고, 수확 7일 후의 과실의 감모율이나 비상품과 발생률도 차이가 없었다. 과피의 조직을 검경한 결과 과피두께나 과피하부 조직에 차이가 없었다. 따라서 방울토마토 착과방법은 수정벌이용이 다른 방법에 비하여 생육이나 품질에서 큰 차이가 없어 적합할 것으로 판단된다. This study was conducted to investigate the effects of fruiting methods on growth, yield and quality of ‘Koko’ and ‘Suncherry’ (grafted ‘Special’ stock) tomato (Lycopersicon esculentum var. cerasiforme Alef.) .Methods of fruiting were bee (Bombus terrestris), vibration, and 4-CPA treatment. There were not significant differences among fruiting methods in growth and yield of ‘Koko’ and ‘Suncherry/Special’ tomato. Number of seeds, flesh and juice ratio of fruit were different significantly, whereas, hardness and compressive strength of pericarp were not different significantly among fruiting methods. There were not significant differences among fruiting methods on soluble solids, acidity content, ratio of fruit reduction, and occurrence ratio of unmarketable fruit of investigated tomatoes on the 7th day after harvest. It is not easy to distinguish the difference of pericarp color with naked eye among the fruiting methods or between varieties because, L* value is low and a*, b* value is closed together at the same position of L*a*b* color chart. So, it is not supported that storage quality was decreased and pericarp color was changed dark-red in bee pollination treatment. There were not significant differences in thickness and state of pericarp observed by microscope among fruiting methods or between varieties. Therefore, it was considered that the bee fruiting method is good because fruit quality was not different significantly among fruiting methods or between varieties.
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전희(Hee Chun),최영하(Young Ha Choi),엄영철(Yeong Cheol Um),백이(Y Paek),유인호(In Ho Yu),류희룡(Hee Yong You),현태선(Tai Sun Hyun),연미영(Mi Yong Yon),신용습(Yong Seub Shin) (사)한국생물환경조절학회 2008 생물환경조절학회지 Vol.17 No.1
참외 재배시설에서 시설 내부 필름 표면에 결로현상으로 부착된 수적량과 시설 외부 필름 표면에 부착된 분진 부착량이 적었던 PO-2에서 투광률이 71.2%로 가장 높았다. 겨울철 시설 터널에서 온도가 가장 낮은 새벽 시간의 기온은 노지보다 11.8~14.5℃ 정도 높게 나타났으며, 피복자재에 따라서는 최고 2.7℃ 차이가 났는데 PO-2에서 가장 높았다. 지온은 터널이 노지보다 13.0~15.3℃ 정도 높았으며, PO-2에서 가장 높아 PE보다 2.3℃ 높았다. 참외 과실 전체에서 엽산을 분석한 결과 엽산함량은 품종에 따라 68.9~113.4㎍/100g 정도로 나타났다. 저온기에 참외 과육에서 45~53㎍/100g 정도로 나타났다. 저온기에 참외 과육에서 45~53㎍/100g정도로 나타났으며, 보온성과 광환경이 우수한 PO-2에서 PE보다 17% 정도 높은 수준을 보였다. 그러나 외기 온도가 15% 정도 높은 수준을 보였다. 그러나 외기 온도가 15℃ 이상 확보된 시기에는 55.2~75.2㎍/100g 정도로 나타났으며, PO-2에서 PE보다 과육에서 36% 높은 수준을 보였다. Light transmittance of PO-2 film was 71.2% higher than any other films, because of low amount of pending water and attaching dust on film surface. On dawn, the air temperature of tunnel were higher than that of outdoors as much as between 11.8 and 14.5℃ on Feb. 19 to 20, 2007. The air temperature in the greenhouse covered with PO-2 film was higher than any other films as much as 2.3℃. Analyzing of folate in oriental melon, the folate contents of fruit were between 68.9 and 113.4㎍/100g according to varieties. In winter, the folate contents in the treatment of PO-2 film was higher than that in the treatment of PE film as much as 17%. Above 15℃ in outdoors mean air temperature, the folate contents were as much as between 55.2 and 75.2㎍/100g. The folate contents in the treatment of PO-2 film was higher than that in the treatment of PE film as much as 36%.
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