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Cu를 함유한 저합금 고장력강의 미세 조직에 미치는 열처리의 영향
박태원,심인옥,김영우,강정충 ( T . W . Park,I . O . Shim,Y . W . Kim,C . Y . Kang ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.2
A study was made to examine the effects of heat-treatment on the microstructures of Cu-bearing HSLA steels. The details of microstructures were studied by using optical microscopy(OM), transmission electron microscopy(TEM) and hardness test. The as-rolled microstructure of HSLA-A consists of ferrite(α) whereas that of HSLA-B consists of needle-shaped phase. The difference in microstructure can be ascribed to the different amount of Ni, Mn, Mo, Cu which affect the hardenability. The sustenite grain size is very small up to 1000℃ owing to the Nb-precipitates. As the austenitizing temperature increases above 1000℃, the austenite grain grows rapidly. There are two hardness peaks in the hardness versus temperature curve, at 500℃ and at 675℃(HSLA-A), 725℃(HSLA-B). The peak at 500℃ result from the formation of Cu-precipitates and second hardness peak is created due to the formation of M-A constituents. The hardness decrease in HSLA-B steel with ageing temperature is small because of the higher amounts of Cu than HSLA-A steel. The fine, round ε-Cu precipitates grow with ageing temperature and finally transform into rod shape.
박선자 ( N. W. Park ),박노원 ( S. J. Park ),박태원 ( T. W. Park ),박효숙 ( H. S. Park ) 대한임상검사과학회 1984 대한임상검사과학회지(KJCLS) Vol.16 No.1
The incidence of pulmonary mycotic infection is increasing these days, and it can be frequently over-diagnosed as very well differentiated squamous cell carcinoma on sputum cytology due to its simi1ar morphology. Althouh each cell in pulmonary mycosis shows marked atypism or metaplastic changes, but we must considered the whole spectrums for differential diagnosis , ie. true tumor diathesis, volume of atypical cells, or chromatin pattern of the cell etc. Herein we report a case of pulmonary mycosis overdiagnosed as highly suspicious squamous cell carcinoma on sputum cytology.
박태원,김상중,박찬종(T.W.Park),S.J.Kim,C.J.Park 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Using of computers in design is a trend in recent years. A good suspension model is depend on the carefully prepared data like joint connection points or spring stiffness, etc.<br/> Once a good computer model is obtained, a parametric study for specific suspension design factor, like a toe angle, can be done to obtain sensitivity information. Using this information, several important design parameters for a specific design factor can be identified. Once a design of experiments is done using computer models, the results can be used to approximate a function which can best represent the experimentation. An optimum solution of this function can be used to fined an optimum design of a suspension system for a specific suspension design factor. Same method is again applied to other design factors iteratively until a good suspension system design is obtained.<br/>
박태원(T. W. Park),임홍재(H. J. Yim),이기호(G. H. Lee),박찬종(C. J. Park),정일호(I. H. Jeong) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Ride harshness is the important characteristic for a passenger bus. Since ride generally involves frequencies up to 30 Hz, special modelling technique should be used for ride harshness analysis. This paper investigates modelling technique of a passenger bus for ride analysis which involves coupling of rigid bodies and flexible bodies in one model. First step is to build a rigid model and next step is to establish FEM model of a bus body and leaf springs. Then, prepared FEM model is coupled with the rigid model Computational results of the coupled bus model is compared with the testing results. Then, sensitivity analysis was carried out to suggest the direction for the ride quality improvement.<br/> <br/>