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비파괴 콘크리트 압축강도 측정용 전자식 타격응답 장치 개발
최용만(Choi Man Yong),장선재(Jang Sun Jae),박정학(Park Jeong Hak),박해원(Park Hae Won) 한국구조물진단유지관리학회 2007 한국구조물진단학회 학술발표회논문집 Vol.11 No.1
This paper describes for development of electronic impact hammer of the non-destructive for compressive strength measurement of concrete. There is test method for rebound number, it is used most plentifully in safety inspection of the infrastructure. This electronic impact hammer, it solved the problem of schumidt hammer. It acquires the reliability which is excellent existing schumidt hammer compared to. The electronic impact hammer measurement data is acquired from the detection coil the velocity which and a degree of acceleration response waveform, it will be able to measure the compressive strength of the concrete. In this paper described, it is development for accurate measure of the compressive strength of the concrete which it is electronic impact hammer.
최용만(Yong Man Choi),박문규(Mun Gyu Park) 대한소화기학회 1984 대한소화기학회지 Vol.16 No.2
N/A The resection of small bowel is inevitable for the treatment of small bowel obstruction and other lesions, whether its cause is related to small bowel lesion or not. This study was the clinical analysis of 123 cases of small bowel resection at the Department of Surgery in Ewha University Hospital during past 10 years from Jan. 1974 to Dec. 1983. The results were as follows' 1) The ratio of male to female was 1.4: l. 2) The age distribution was 4th decade (19.5%), 3rd decade (17.1%), 5th decade (13.8%) and infancy (13.8%) in order of frequency. 3) The most common causes of small bowel resection was strangulated bowel obstruction (36.6%) and the other cardinal causes trauma(9.8%) and cognenital anomaly(6.5%) In the cases of resection of terminal ileum including right colon, neoplasm(19.5%) and intestinal tuberculosis(8.1%) were also main causes. 4) The strangulation of small bowel was caused by postoperative adhesion(53.3%) mainly. 5) In 40 cases among 123 cases(32.5%), previous operation or radiotherapy were performed in past medical history. 6) The sites and their numbers of resection were ileum 59 oases(48%), jejunum 22 cases (17.9%), jejunum and ileum 6 cases(4.9%), duodenum 1 case(0.8%) and ileum including right colon 35 cases(28. 5io). 7) The extents and their cases of resection were as follows: ① massive resection(150 cm) was 12 cases. ②wide resection(50-150cm) was 44 cases. ③ moderate resection(1Q-50 cm) was 43 cases. ④minimal reaection(10 cm) was 24 cases. G) The early postopreative complications were occurred in 54 cases of 47 patients and wound infection(46.3%) was the most common complication. 9) The postoperative mortality was 6.5% and its most common cause was sepsis.