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1987년 한국에서 발생한 렙토스피라병의 혈청역학적 조사
이증훈,박영수,이우곤,김석용,정선식,우준희,박성광,박경희,송영욱,김선영,기정일,최두혁,강성귀,김주완,최강원,김우열,최명식,최인학,장우현,윤성열 대한감염학회 1988 감염 Vol.20 No.3
Human leptospirosis was an unfamiliar disease in Korea until 1984 that outbreak of leptospirosis occurred among farmers and soldiers after field works for harvesting rice. During that time, Lee and Jo confirmed the first Korean cases of leptospirosis by serological test, isolation of causative agent and autopy findings. Afterward several outbreaks occurred also during autumn especially after flood in every years and some characterisitcs of leptospirosis in Korea such as clinical manifestations, serotypes and seroepidemiological features has been revealed by many investigators. Because of the major mode of transmission between rodents and human is by direct contact with leptospiral urine of rodents or contaminated soil by the urine, leptospirosis in Korea has been primarily a disease of person in occupations heavily exposed to contaminated soil or infected urine such as farmer, army and etc. Therefore it seems that leptospirosis is one of the main communicable diseases to be controlled urgently in Korea, for an agricultural people account for almost half of total Korean people. For clarifying the seroepidemiological patterns of human leptospirosis in Korea by sex, month region and main reacting serovars of L. interrogans among acute febrile disease occurred in 1987, 1,773 patient's sers with acute febrile episodes were tested by microagglutination test using 19 representative strains of leptospiral serogroup as antigen. All of those sera were collected from 10 collaborative clinics located in Kyunggi, Kangwon, Chungbuk, Chungnam, Chonbuk, Chonnam province and Seoul. The results wee summerized as follows. 1) Among 1,773 sera of patients with acute febrile episodes, 219 (12.4%) were seropositive to L. interrogans, 487(27.5%) to R. tsutsugamushi, 241(13.6%) to R.typhi and 160(90.0%) to Hantaan virus. 2) Among seropositives to L.interrogans, the male outnumbered the female, 65% and 35%. 3) For age distribution, 26.9% of seropositives to L.interrogans were fifties, 19.6% were forties, 9.1% were sixties, 5.9% were thirties and 4.1% were twenties. 4) Eighty three percent of seropositives had occurred between September and October in 1987 with a peak in September. 5) Main leptospiral serovars reactive to patient's sera were Icterohaemorrhagiae(54.3%), Canicola(31.0%), CH-48(13.2%), Tarassovi(0.9%)and Cynopteri(0.5%). 6) For regional distribution, 65.8% of seropositives to L.interrogans were residents from Chonbuk, 12.3% were Chonnam, 7.3% were Chungnam, 5.5% were Kyunggi and 1.4% were Kangwon.
진동볼밀링을 이용한 기계적합금과정의 모델 시뮬레이션에 의한 해석
김성규,정해용,박용호,이병우,김우열,배차헌 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.7
The motion of each milling ball during vibratory ball milling of metal powder was simulated by a computer using one-, two-and three-dimensional models of a vibratory ball mill In these models, the consumption of impact energy of the balls by the micro-compaction of metal powder particles during impact was assumed to be equivalent to the energy loss by an imaginary viscosity given to the balls and mill container. As a result of the simulation by using the three models, it was found that the motion of the milling balls is strongly dependent on the ball charge fraction. With an increase in the ball charge, the impact frequency increased, while an avarage of impact velocity normal to each contact surface decreased. The impact velocity or the impact energy obtained by the simulation was related to the microhardness, crystallite size and lattice strain of the powder particles which were mechanically alloyed by vibratory mill.
0.32%C-Ni-Cr-Mo鋼의 熱處理에 따른 强度와 延性變化에 關한 硏究
金雨烈,金武吉 釜山工業大學校 1980 論文集 Vol.21 No.-
The results to be investigated on strength and ductility in mixed structures (Martensite+Bainite) in 0.32% C-Ni-Cr-Mo steel are as follows; 1) The increase of volume fraction of upper bainit decreasese ductility and strength 2) Volume fraction of about 50% showed the positive deviation from mixture rule.
열처리 방법에 따른 2相 혼합조직강의 Martensite 분포형태와 경도에 관한 연구
김우열,김무길,김영환 釜山工業大學校 1985 論文集 Vol.27 No.-
The relationship between Martensitic morphology and hardness was examined under optical microscope with the process of heat treatment The results gained at the different methods were as follow: 1) DPⅠ and DPⅡ showed network structure and isolated island structurer in low volume fraction of the second phase, is martensite, respectively, but in high volume fraction its phenomenon was disappeared 2) DPⅡ showed fine grained structure and the hardness of this process was higher than that of DPⅢ, but lower than that of DPⅠ 3) In low volume fraction of the second phase, the hardness was increased by the formation of martensite-martensite interface in DPⅠ process than that of other processes.