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200㎫급 초고강도 콘크리트의 자기수축 특성에 관한 실험적 연구
하정수(Ha Jung-Soo),백민수(Paik Min-Su),손유신(Sohn Yu-Shin),이승훈(Lee Seung-Hoon),이영도(Lee Young-Do),정상진(Jung Sang-Jin) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.8
Low W/B ultra-high strength concrete has low porosity and discontinuous capillary tube in the cement milk. Within a few days after placement, autogenous shrinkage occur because of the quick drying from the self-desiccation. So, the possibility of cracking is higher than the normal strength concrete. In this study, the autogenous shrinkage deformation characteristics of ultra-high strength concrete that are different from the normal strength concrete were examined. A new shrinkage formula is suggested form the experiment data. The conclusion is as follows. 1) The 91days strength of the concrete combination that are W/B 12.5%, normal portland cement 55%, china silica fume 20%, GGBFS-2 20%, anhydrite 5% was the best result, 193.7㎫. So, it is the appropriate combination for the 200㎫ grade ultra-high strength concrete. 2) The autogenous shrinkage deformation of W/B 20% ultra-high strength concrete can be predicted using the suggested shrinkage formula.
간척지 기상조건에서의 온실 내부 공기유동 및 환기효율 분석
하정수 ( Jung-soo Ha ),이인복 ( In-bok Lee ) 한국농공학회 2013 한국농공학회 학술대회초록집 Vol.2013 No.-
Development of a large scale of farming region on reclaimed land has been increasing with the purpose of stable production of flower and crop by the demand of large consumption. So it needs a comprehensive technical development for greenhouse design which is suitable for specific climate of reclaimed land and able to cope with the climate change. At the present in Korea, the standard design of greenhouse is not appropriate to apply because it was suggested many years ago and is not proper for today's climate. Among the standard, a heat balance equation for ventilation requirements coming from Japan at 1960s has been used but there is some ambiguous part on the application to Korea's greenhouse design. Therefore, it is necessary to upgrade a technique of greenhouse built on reclaimed land. In this study, a proper ventilation design of greenhouse was studied through the analysis of internal airflow and ventilation efficiency according to the various environmental conditions. A program of CFD(Computational Fluid Dynamics) was used to make a greenhouse airflow simulation model and did a comparison analysis for validation of two results which are CFD simulation, PIV(Particle Image Velocimetry) and wind-tunnel test. Single even span type of greenhouse was used to validate the results. To induce the proper design of CFD model with high accuracy, mesh size, turbulence model and laminar zone to maintain a wind profile were considered based on the results of validation test. It was validated with velocity distribution on specific lines in the middle of greenhouse. From the computed results, the R<sup>2</sup> values were 0.99, 0.99 in case of the side opening case each external velocities(1m/s, 1.5m/s) and its RMSE values were 0.08, 0.24. At side-roof opening case, R<sup>2</sup> values 0.98, 0.98, RMSE values 0.29, 0.50 were calculated. It has been studied to make a proper simulation model from validation results and evaluate the airflow, natural ventilation and ventilation requirements at various greenhouse types and environmental conditions.
지속적 외래 복막투석 중인 말기 신부전 환자들에서의 수근관 증후군
하정수(Jung Su Ha),이홍기(Hong Gi Lee),윤혁진(Hyeok Jin Yoon),김양욱(Yang Wook Kim),김영훈(Yeong Hoon Kim),박인선(In Sun Park) 대한신장학회 2001 Kidney Research and Clinical Practice Vol.20 No.2
N/A Background: Carpal tunnel syndrome(CTS) is a long-term complication in dialysis patients which results from compression of the median nerve within the carpal tunnel. It has been reported to occur with increased frequency in the hemodialysis population, but, there are few reports concering long-term complications in CAPD because of the relatively shorter duration of dialysis in most CAPD patients. The aim of this study was to determine the incidence of CTS in patients undergoing CAPD. Methods: We analyzed 21 chronic renal failure (CRF) patients(males 14, females 7; age range 19-79 yr) undergoing CAPD. The patients were evaluated by questionnare, physical examination, and nerve conduction test(NCT). Age, gender, duration of CRF before CAPD, duration of CAPD, diabetic history were determined. Results: Among the total 21 patients undergoing CAPD, only 5 patients(24%) were CTS, diagnosed by NCT. Two of these patients were symptomatic CTS, three patients were non-symptomtic CTS. So, there were no relationship between the incidence of CTS and clinical symptoms. Among the diabetic dialysis patients, the incidence of CTS was 28.57%. Also there was no increase in the number of diatetic patients with CTS. Conclusion: It is concluded that the incidence of CTS in CAPD patients was similar with the previous reported incidence(2-31%) of hemodialysis patients. Since CTS is treatable, annual or even semiannual nerve conduction tests is indicated all CRF patients on chronic dialysis.
노팔 선인장 추출액 복용 후 복통과 설사로 발현된 장간막 혈관염 1예
하정수 ( Jung Su Ha ),장동경 ( Dong Kyung Chang ),이준행 ( Jun Haeng Lee ),김영호 ( Young Ho Kim ),손희정 ( Hee Jung Son ),이풍렬 ( Poong Lyul Rhee ),김재준 ( Jae J. Kim ),백승운 ( Seung Woon Paik ),이종철 ( Jong Chul Rhee ) 대한장연구학회 2005 Intestinal Research Vol.3 No.1
Herbs are inadvertently regarded safe and harmless because of their natural origin and the experience of long-term use as a folk medicine. However, some herbal medicines are associated with toxicities in the organs such as liver, kidney, skin, or heart. Norpal cactus extract is a kind of herbs which is used for ordinary food in Mexico, and has effects on hypergylcemia and hypercholesterolemia, and inflammation. There has been no particular reports of drug-induced vasculitis by herbal medicine. Here, we present a case of vasculitis that was initially manifestated as acute diarrhea and abdominal pain after ingestion of Norpal cactus extract. (Intest Res 2005;3:85-89)