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권영표,조종래,이성열,이정환 한국소성가공학회 2001 소성가공 : 한국소성가공학회지 Vol.10 No.7
The flow stress of 304 stainless steel during hot forming process were determined by conducting hot compression tests at the range of 1273 K∼1423 K and 0.05 /s∼2.0 /s as these are typical temperature and strain rate in hot forging operation. In this material, Dynamic recrystallization was found to be the major softening mechanism with this conditions as Previous studies. Based on the observed phenomena, a constitutive model of flow stress was assumed as a function of strain, strain rate, temperature. In the constitutive model, the effects of strain hardening and dynamic recrystallization were taken into consideration. A finite element method connected to constitutive model was performed to predict the dynamic recrystallization behaviors and also stress-strain curves in hot compression of 304 stainless steel.
1987년 경남 울산 공업지대에서 유행하였던 Salmonellosis에 대한 임상역학적 조사
이기호,이규섭,박근조,박문규,권영표,박승철,김민자 대한감염학회 1988 감염 Vol.20 No.2
A survey was made to idenify an infectious source and analyze pattern of epidemic from industrial park, Kyungsang nam do, where the epidemic was occurred in a fashion of explosive from July to August in 1987 and it seemed to be an salmonellosis. The results were as follows; 1) The peak age incidence was the 2nd and 3rd decade amounting to 53(36.0%) and 73(49.7%) patients respectively. The ratio between male and female was 12.7:1 and so extremely prevailed in male. 113 patients were direct productive workers. 2) In bacteriologic study, blood culture was positive in 41 patients (28.7%): 39 for Salmonella group D, one for Salmonella group A and one for Salmonella group B. Stool culture was positive in 4 patients (3.5%) and 7 healthy persons (1.6%) of the patients family. 3) Widal test in a titer of 1:160 or greater was observed in 63.4% of the patients within 3 weeks after illness. 4) The duration for defeverscence was within 7 days in 92.6% of the patients treated with antibiotics; the mean duration was 3.1 days in patients treated with chloramphenicol, 3.5 days in combination of chloramphenicol and cephalosporin. 5) Most of the patients were working in outside of the plants during hot weather just before the epidemic. Drinking of ice water which were preserved, carried in tank and supplied could be worthy of notice as an infectious source. 6) In follow up bacteriologic survey 6 months later, no cases of chronic typhoid carrier could be detected among 26 patients who were culture positive during this epidemic.
김용한(Yong Han Kim),이규섭(Kyu Sup Lee),이기호(Ki Ho Lee),김매자(Mae Ja Kim),권영표(Young Pyo Kwon) 대한소화기학회 1987 대한소화기학회지 Vol.19 No.2
The gastric problems are one of the most serious subjects of internal medicine in Korea. The endoscopic examination of stomach is more valuable than that of radiological means because the biopsy can be performed through fiberoptic gastroscope. In gastroscopic biopsy, the intestinal metaplasia is frequently found. The frequency and location of intestinal metaplasia are examined in this study. The general frequency of intestinal metaplasia is (20.6%) (46 cases) in all (223) biopsied cases. The peak incidence is 31.3% in sixth decade, whereas 13.3% in third decade. 40 cases (87.0%) of intestinal metaplasia is found in gastric antrum. So, we concluded that the intestinal metaplasia is more frequent in aged man and majorities of intestinal metaplasia are found in gastric antrum and 26.1% of the cases are complicated with chronic peptic ulcer.