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김남웅(NamWoong Kim),박영일(Yeong-il Park),임원식(WonSik Lim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Due to the increase of the oil price, the needs for the fuel efficiency improvement of the vehicles are growing and as environmental problems like CO₂ emission be issues, many automotive companies have developed various new technologies to deal with those issues. Automated Manual Transmission(AMT) is one of those technologies. AMT, based on conventional manual transmission, uses various control units and actuators to automate the clutch actuation and gear shift. As manual transmission"s main clutch is applied to supply the power from the engine to transmission, compared to the torque converter applied to automatic transmission, AMT improves fuel efficiency and has better responsibility due to the varied shift mode. Also comparing to automatic transmission, it provides the same ease. This paper is to analyze heavy duty track applied AMT"s structure, performance characteristics, automated shifting. And compare the data from real vehicle experiments to study the responsibility of shifting control and stability.
황효균(Hwang Hyo-Kune),김남웅(Namwoong Kim),단병주(Byung Ju Dan),김종만(Jongman Kim),김외열(Wae Yeul Kim),이진우(Jin Woo Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
CD-R disc drive is one of the basic options of personal computer today. In this trend, various CD-R discs<br/> can be purchased in every market. Even very low quality discs are in market too. Today's CD-R disc drive is<br/> being operated over 10,000 RPM. So the possibility of the disc fracture is growing faster. Sometimes, during<br/> the test of a new disc drive by various methods to confirm the quality of it, fracture of the disc happens. And it<br/> happens in end user's personal computer scarcely. In this reason, new methods to confirm the quality and the<br/> failure mechanism of the optical disc are studied in this paper.
황효균(Hyo-Kune Hwang),김남웅(Namwoong Kim),단병주(Byung Ju Dan),김종만(Jongman Kim),김외열(Wae Yeul Kim),이진우(Jin Woo Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The base material of optical disc is the amorphous polymer, polycarbonate. So crack growth on the rotating optical disc could happen by the static centrifugal force. This phenomenon is called static fatigue. Today's CD-R disc drive is being operated over 10,000 RPM. This is increasing the possibility of the disc fracture when operating. In this reason, new method to measure the static fatigue threshold quality and the way to calculate the threshold J-integral value and the safe crack length of the optical disc are studied. Finally the environmental effect to optical disc is also studied in this paper.