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고혈압(高血壓) 및 고지혈증(高脂血症)에 대(對)한 청열도담탕(淸熱導痰湯)의 실험적(實驗的) 연구(硏究)
이대식,신길조,조기호,김영석,배형섭,이경섭,Lee, Dai-Sik,Shin, Gil-Cho,Cho, Ki-Ho,Kim, Young-Suk,Bai, Hyung-Sup,Lee, Kyung-Sup 대한한방내과학회 1991 大韓韓方內科學會誌 Vol.12 No.2
Mahwangsan is used in the treatment of asthma due to wind and cold(風寒喘). This is study was carried out to investigate the effect of Mahwangsan extract and In order to investigate the effects of Chungyeuldodamtang experimental studies were performed in hyperlipidemia Rats induced by cholesterol and Spontaneusly hypertension rats. The contents of serum total cholesterol, triglyceride, phospholipid and FFA and the changes of blood pressure and heart beat were measured. The results were summarized as follows ; 1. The content of Total-Cholesterol in the serum compared with control group tended to be decreased in Chungyeuldodamtang group, but did not show a significance. 2. The content of Triglyceride in the serum was significantly decreased in Chungyeuldodamtang group. 3. The content of Phospholipid in the serum was significantly decreased in Chungyeuldodamtang group. 4. The content of FFA in the serum tended to decreased in Chungyeuldodamtang group, but did not show a significance. 5. The S.H.R's blood pressure was significantly decreased in Chungyeuldodamtang group. 6. The S.H.R.'s Heart beat compared with control group tended to be decreased in Chungyeuldodamtang group, but did not show a significance. According to the above results, it is assumed that Chungyeuldodamtang has a valid effect on Hypertension and Hyperlipidemia.
베어링 스팬상에 기어구동축을 갖는 스핀들 베어링 시스템의 열특성에 관한 연구
최진경,이대길,Choi, Jin-kyung,Lee, Dai-Gil 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.1
High cutting speeds and feeds are essential requirements of a machine tool structure to accomplish its basic function which is to produce a workpiece of the required geometric form with an acceptable surface finish at as high a rate of production as is economically possible. Since the bearings in high speed spindle units are the main heat source of the total cutting system, in this work, the thermal characteristics of the spindle bearing system with a tilting axis were investigated using finite element methods to improve the performance of the spindle bearing system. Based on the theoretical results, a specially designed prototype spindle bearing system has been manufactured. Using the manufactured spindle bearing system, the thermal characteristics were measured. From the comparison of the experimental results with the theoretical ones, it was found that the finite element method predicted well the thermal characteristics of the spindle bearing system.
오제훈,이대길,이수정,이종수,Oh, Je-Hoon,Lee, Dai-Gil,Lee, Su-Jeong,Lee, Jong-Soo 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.6
The finite element analysis for the tubular alumina liner which was shrink-fitted into a heat treated high speed steel (HSS) sleeve and subjected to high inner pressure and high temperature was performed. The parameters for the analysis were the interference between the alumina and the HSS, the temperature, the inner pressure, the coefficient of friction between the alumina and the HSS, and the taper at the sleeve ends. From the analysis, it was found that the tensile hoop stresses were decreased when the end parts of the HSS sleeve were tapered and the tensile stresses were decreased as the coefficient of friction between the alumina and the HSS was decreased. Also it was found that the alumina might be used as the structural liner for high pressure and high temperature when it was shrink-fitted into a heat treated HSS sleeve.
방경근,이대길,Bang, Kyung-Geun,Lee, Dai-Gil 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.10
Composite air spindles are appropriate for the high-speed and the high-precision machining as small hole drilling of printed circuit board (PCB) or wafer cutting for manufacturing semiconductors because of the low rotational inertia, the high damping ratio and the high fundamental natural frequency of composite shaft. The axial load and stiffness of composite air spindles fur drilling operation are determined by the thrust ben ring composed of the air supply part mounted on the housing and the rotating part mounted on the rotating shaft. At high-speed rotation, the rotating part of the thrust bearing should be designed considering the stresses induced by centrifugal force as well as the axial stiffness and the natural frequency of the rotating shaft to void the shaft from failure due to the centrifugal force and resonant vibration. In this work, the air supply part of the thrust bearing was designed considering the bending stiffness of the bearing and the applied load. The rotating part of the thrust bearing was designed through finite element analysis considering the cutting forces during manufacturing as well as the static and dynamic characteristics under both the axial and con trifugal forces during high-speed rotation.