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Mathematical Models to Predict Wear Life in Boundary Lubrication
김종균 空軍士官學校 1982 論文集 Vol.14 No.-
이 논문은 경계윤활영역에서 기계 또는 기계요소가 상대접촉운동을 할 때 설계기사에게 수명을 예측할 수 있는 데이터를 제공할 수 있도록 수학적 모델을 개발하는데 있다. 상대접촉운동을 할 때 정점하중이 유막하중에 비하여 큰 경우 adhesive wear model에 의한 수명추정이 적당하고, 반대의 경우 fatigue wear model을 통한 수명계산이 예상된다.
金鍾均,金俊泰,鄭炳哲 公州大學校 基礎科學硏究所 1995 自然科學硏究 Vol.4 No.-
VAM과 포자 밀도와 토양 온도, pH, 수분함량과 인 함량은 각각 음의 상관 관계에 있고 유기물 함량과 총 질소량은 각각 양의 상관 관계에 있다. 遷移 안정 지역인 非攪亂地에 비해 攪亂地의 植生에서 VAM 공생이 높았다. The environmental factors of soil affecting on the density of VAM spore were temperature, pH, moisture and phosphorus, which were negative factors, and organic compound and nitrogen were positive. In succession-stability area, the floral zone of disturbance area was higher VAM simbion than non-disturbance area.
김종균 대한영상의학회 1985 대한영상의학회지 Vol.21 No.4
As a adjuvant, 99mTc-IDA complex cholescintigraphy has been used to differentiate the cause of jaundice, hepatocellular jaundice from the obstructive jaundice. So we conducted the retrospective study from the 41 cases of cholescintigraphy from the Mar. 83 to Sept. 84 at the dept. of radiology in the soonchunhyang university to determine the etiology and diffential points in the diagnosing the Jaundice. The following results were obtained; 1. As a 1st-ordered parameter, the leading edge hepatic parenchymal transit time was very significant in differentiating the causes of jaundice, among the hepatocellular jaundice, obstructive jaundice dut to tumor, and obstructive jaundice dut to cholelthiasis. (P<0.01 by X2-test) 2. As a 2nd-ordered parameter, hepatic clearance was very significant in differentiating the hepatocellular jaundice from the jaudice dut to partial biliary obstruction. (P<0.01 by t-test) 3. The difference in hepatic clearance between the biliary obstruction dut to tumor and that of the cholelithiasis, was not significant. (P>0.05 by X2-test) 4. The difference in bile duct dilatation among the hepatocellular jaundice obstructive jaundice dut to tumor, and obstructive jaundice dut to cholelithiasis, was significant in differentiating the causes of jaundice. (P<0.05 by X2-test) 5. Intrahepatic stone showed scintigraphic intrahepatic pooling with partial stasis. 6. Cholescintigraphy was useful to differentiated the Rotor's syndrome from the Dubin-Johnson syndrome, supplying the additional criteria.