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한국 농촌거주 정상인의 Leptospira Interrogans에 대한 항체보유율 현황
최강원,최성배,국윤호,장우현,우준희,박경희,강재승,차창룡,김양수,김석용,윤종구,김익상,이우곤,최명식,송영욱 대한감염학회 1988 감염 Vol.20 No.3
It has been well known that leptospiroisis is a one of the prevailing acute febrile diseases in Korea. In order to find out the incidence of past infection of L. interrogans among normal population, a total of 1,171 sera obtained from rural residents and tested by microscopic agglutination test. All of normal resident's sera were collected during July in 1987, just before epidemic season, at Keochang county(248 sera), at Wanju county(145 sera), at Wonseoung county(255 sera), at Cholwon county(411 sera) and at Kongju county(112 sera). Seropositive rate against L. interrogans among rural residents was 12.0% and ranged from 2.7% in Kongju county to 18.5% in Cholwon county. There was a higher seropositive rate in males and the majority of seropositives occurred in the age group over 30 yesrs. Icterohaemorrhagiae was a most commonly reacting serotype of L. interrogans and followed by CH-48 and Canicola. The sera reacted with Cynopteri, Ballum, Australis, and Pyrogenes were present also.
분산강화형 초내열합금의 threshold 응력 예측을 위한 모델링
권숙인,최성배,변재원,이재훈 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.6
The creep behavior of PM1000 alloy, ODS Ni-base superalloy with 0.6wt%Y₂O₃ was investigated in order to understand the role of dispersoids during high temperature creep deformation as a modeling alloy. Nimonic75 alloy which has no dispersoids but has almost the same chemical composition as PM1000 was selected as a reference alloy. Creep tests were performed at 800℃ 900℃ and 1000℃. In contrast to Nimonic75, the PM1000 alloy showed the threshold behavior at certain stress level under which no detectable creep strain proceeds, TEM observations indicated that there was an attractive interaction between particles and dislocations. A new model to predict the threshold stress in high temperature creep was proposed in this study. The predicted threshold stresses by this model agreed well with the experimental results.