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고속 주축의 진동 특성 향상을 위한 베어링의 위치 선정
임정숙(J. S. Lim),황영국(Y. K. Hwang),이원창(W. C. Lee),이춘만(C. M. Lee),정원지(W. J. Chung) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
This paper presents analysis of dynamic characteristics of a high-speed milling spindle with a built-in motor. The spindle system with a built-in motor can be used to simplify the structure of machine tools, to improve the machining flexibility of machine tools, and to perform the high speed machining. In this system the shaft is usually assumed as a rigid rotor. In the spindle system design, it is very important to improve modal characteristics, and modal analysis is performed in the first place. Therefore in this paper, on the assumption that supporting bearings of spindle was selected most suitable condition, analyzed dynamic characteristics of a high-speed spindle according to its position. Optimal design was applicated to select most suitable position of bearings. Considered the mass and stiffness effects of the built-in motor"s rotor are analyzed by numerical method. The result shows the natural frequency of 1st bending mode of spindle.
신성우(S. W. Shin),이춘만(C. M. Lee),정원지(W. J. Chung),김재실(J. S. Kim),이원창(W. C. Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Multi-tasking machines are widely used in machine tool industries nowadays. This study focuses on the effect of load on the structure stabilities of laser multi-tasking machine which is comprehensively combined turning center and laser machine. For design of the machine, simulation of structural analysis is carried out varying number of elements. The analysis is carried out by FEM simulation using the commercial software, CATIA V5. This method showed a proper number of elements can be selected to obtain good result by reduced computation time.
臨床獸醫師들을 爲한 家畜의 生體重簡易測定法에 關한 生物測定學的 考察 - (第1報) 韓牛를 中心으로
Lee W. C.(李元暢),Lee, S. M.(李相穆),Chang, K. J.(張京鎭) 한국예방수의학회 1979 예방수의학회지 Vol.3 No.2
In the physical characterization of an individual, a measure of body weight of patient is fundamental importance for veterinary service. This study was conducted in order to a biometric study on the simple methods of estimating body weight by the physical measurement data on the subject were collection from Korean Agricultural Cooperation Data Books. As a result of this study, the following conculsions were made. 1) The correlation coefficient of body weight and chest-girth of Korean native cattle (cow) was highly significant as r=+0.997(p>0.01) and its induced regression equation was shown as the following; Y=4.07x-349.2 (* Y is body weight in kg, X is chest-girth in cm) And the correlation coefficient between body weight and chest-girth of the Korean native bull was r=+0.988 (p<0.01), the inducion from it, we obtained the following regression equation; Y=4.686x-424.713 (* Y is body weight in kg, x is chest-girth in cm) 2) As estimation of body weight of cattle from measurement of chest-girth the equation of regression was less in error than the relative chest-girth method.
韓國에서의 日本腦炎에 關한 硏究 - (第II報) 日本腦炎發生의 關係要因에 對한 醫學計學的 考察
Lee W.C.(李元暢),Yun K.B.(尹快炳),Lee T.J.(李澤柱),Yoon H.J.(尹和重),Chung, B.H.(鄭柄鉉),Lee S.M.(李相穆) 한국예방수의학회 1983 예방수의학회지 Vol.7 No.1
This paper will present an epidemiological information aspects of Japanese encephalitis in Korea of the past ten years from 1971 to 1980 and the medical statistical observation on the relative factor of Japanese encephalitis. It hoped that the information will be used for reference in future endeavors of study in the follows: The obtained results were as follows: 1. The mean of the incidence cases of Japanese encephalitis in Korea from 1971 to 1980 was 94.2±24.6(S.E.), that of incidence rate per 100,000 was 0.26±0.07 (S.E.) and that of case fatality rate was 3.6±0.89 per 100 cases. 2. The highest incidence cases of Japanese encephalitis could be found in younger whose age under 19 years old, which accounted 96% of the total incidence cases. 3. The correlation coefficient between the incidence cases of Japanese encephalitis and number of vaccinated in man was r=-0.416, its and pesticide consumtion amount was r=-0.432 and its and number of pig vaccinated was r=-0.485. 4. Correlation coefficient between year after imported and positive rate of HI test of Japanese encephalitis was r=+0.976.