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원형질체환원에 의한 몇가지 식용버섯류의 Neohaplont 의 선발
박용환,이연희,유영복,차동열,여운형,엄승덕 한국균학회 1987 韓國菌學會誌 Vol.15 No.1
Neohaplonts were obtained to improve mushroom strain from dikaryon strains of Flammulina velutipea, Ganoderma lucidum, Lyophyllum ulmarium, Pleurotus cornucopiae and Pleurotus spodoleucus by protoplast reversion. The noehaplont frequency from reversion colonies of protoplasts was 4.47-47.7%. Four more types of morphological characteristics were detected from neohaplonts of protoplast reversion in L. ulmarium, P. cornucopiae and P. spodoleucus, but one or two types were neohaplonts in F. velutipes and G. lucidum. Growth rate of neohaplonts was slow compared with dikaryon strains.
박용환 湖西大學校工業技術硏究所 1998 工業技術硏究所論文集 Vol.17 No.-
항공기, 자동차 등의 터보 엔진 부품용 경량 신소재로 구조용 세라믹스가 크게 주목을 받고 있다. 그러나 세라믹스도 일정 크기 이상의 작용 하중과 고온의 작동 온도에 대하여는 금속의 경우와 마찬가지로 탄소성 변형에 의한 파괴와 크라프의 영향을 받게 될 것으로 추정된다. 이러한 세라믹스의 거시적 거동은 특성상 매우 미세하여 이를 실험적으로 살펴보기 위하여는 고난도의 특수한 실험적 접근 방법이 필요하다. 이에 본 논문에서는 구조용 세라믹스의 고온 기계적 거동을 실험적으로 규명할 수 있는 특별한 시험장치와 시험기술을 제시하고, 실제로 세라믹 시험편에 대한 인장 및 크라프 시험을 실시하여 그 결과를 고찰하였다.
Factors Related to Prehospital Time Delay in Acute ST-Segment Elevation Myocardial Infarction
박용환,강구현,Bong Gun Song,천우정,이준호,황성연,오주현,박경일,김영대 대한의학회 2012 Journal of Korean medical science Vol.27 No.8
Despite recent successful efforts to shorten the door-to-balloon time in patients with acute ST-segment elevation myocardial infarction (STEMI), prehospital delay remains unaffected. Nonetheless, the factors associated with prehospital delay have not been clearly identified in Korea. We retrospectively evaluated 423 patients with STEMI. The mean symptom onset-to-door time was 255 ± 285 (median: 150) min. The patients were analyzed in two groups according to symptom onset-to-door time (short delay group: ≤ 180 min vs long delay group: > 180 min). Inhospital mortality was significantly higher in long delay group (6.9% vs 2.8%; P = 0.048). Among sociodemographic and clinical variables, diabetes, low educational level, triage via other hospital, use of private transport and night time onset were more prevalent in long delay group (21% vs 30%; P = 0.038, 47% vs 59%;P = 0.013, 72% vs 82%; P = 0.027, 25% vs 41%; P < 0.001 and 33% vs 48%; P = 0.002,respectively). In multivariate analysis, low educational level (1.66 [1.08-2.56]; P = 0.021),symptom onset during night time (1.97 [1.27-3.04]; P = 0.002), triage via other hospital (1.83 [1.58-5.10]; P = 0.001) and private transport were significantly associated with prehospital delay (3.02 [1.81-5.06]; P < 0.001). In conclusion, prehospital delay is more frequent in patients with low educational level, symptom onset during night time, triage via other hospitals, and private transport, and is associated with higher inhospital mortality.
박용환,장권열,유영복,유창현,이연희,존폐버디 한국균학회 1987 韓國菌學會誌 Vol.15 No.3
Interspecific heterokaryons were obtained by polyethylene glycol induced fusion of protoplaste from auxotrophic mutants of P. ostreatus+P. cornucopiae, P. ostreatus+P. florida, P. ostreatus+P. sajor-caju, P. florida+P. cornucopiae, P. florida+P. sajor-caju and P. sajor-caju+P. cornucopias protoplasts. The Fusion products of protoplasts were induced by MCM+benomyl, but segregation of sectors were not identified. Interspecific fusion products of protoplasts between incompatible strains did not form true clamp connections and did not produce fruit bodies. For induction of fertility, interspecific heterokaryons crossed with their parents by hyphal anastomosis.