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조상필(Cho Sang Pil) 한국지역개발학회 1995 韓國地域開發學會誌 Vol.7 No.1
This thesis aims to analyze positively the determinants regional development, and to search implication of policy that induces inter-regional balanced development. The major results of this study could be follows ; (1) Development level have correlation with employment opportunity to the highest degree ; (2) Development level are correlated with capital formation capacity, level of public investment, attractiveness of the region, technology innovation, activated population, base of economic activity, productivity and policy making capacity etc. to high degree. Second, at country level, multiple regression(dependent variable ; regional development level, independent variable ; developing factors) is like this. Between 1980 and 1990, the core factors on regional development are employment opportunity, transportation fascilities, government policies and other factors which are less important are industry structure, technology innovation, inter-regional trade, the level of public investment, capital formation capacity, productivity, base of economic activity.
Study of the Transmission Error Prediction of a Five-speed Manual Transmission System
Sang-Pil Cho(조상필),Dong-Gyu Lee(이동규),Lae-Sung Kim(김래성),Zhe-zhu Xu(허철수),Sung-ki Lyu(류성기) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.2
For the manual transmission gearbox used in the automotive industry, gear meshing transmission error is the main source of noise known as gear whine, and radiated gear whine noise plays an important role in the whole gearbox. Therefore, in order to keep competitive in the automotive market, the NVH performance of transmission gearboxes is increasingly important for automotive manufacturers when a new product is developed. In this paper, in order to achieve an optimized tooth contact pattern, gear tooth modification is applied to make up for the deformation of the teeth owing to load. A five-speed MT gearbox is firstly modeled in RomaxDesign software and the prediction of transmission error under the loaded torques is studied and compared. From the simulation, the transmission error and maximum contact stress are also simulated and compared after tooth modification of the loaded torques. Finally, the simulation results are used to optimize the whole gearbox design and the final gearbox prototype is testified to obtain NVH performance in a semi-anechoic room.
프로피버스 통신을 이용한 실시간 절삭 상태 모니터링에 관한 연구
윤상환(Sang-Hwan Yoon),조상필(Sang-pil Cho),류성기(Sung-gi Lyu) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.3
The cutting processes used for monitoring engineering includes analysis and feedback about strange conditions, tools collision and tools wear in real time, for improving the working ratio of equipment and productivity. In this study, we proposed monitoring using profibus to increase the reliability as the most important factor for cutting monitoring. The profibus can increase the reliability of cutting monitoring for cutting torque of a main spindle motor and a feed motors through PLC-based interface.