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[論文] 노크센서를 이용한 점화시기 피이드백 제어에 관한 연구
김연준(Y.J.Kim),고상근(S.K.Kauh) 한국자동차공학회 1992 오토저널 Vol.14 No.4
The ignition timing feedback control system was studied to enhance the engine power and to reduce the fuel consumption by optimizing the spark timing.<br/> The signal of a piezo-electric vibration transducer attached to the engine block was compared with that of a pressure transducer in order to determine the knock intensity. With the result of comparison the ignition timing feedback control system which detect the knock and correct the spark timing was set up.<br/> The ignition timing could be more advaced with this control system than with the existing system without the continuous knocking, therefore the engine torque was increased.
CFUBMS을 이용한 TiZrAlN 나노복합 박막의 미세 구조와 기계적 특성
김연준(Youn J. Kim),이호영(Ho Y. Lee),김용모(Yong M. Kim),김갑석(Kab S. Kim),한전건(Jeon G. Han) 한국표면공학회 2007 한국표면공학회지 Vol.40 No.1
Quaternary TiZrAlN nanocomposite thin films were synthesized by Closed-Field Unbalanced Magnetron Sputtering (CFUBMS), and their microstructure and mechanical characteristics were examined. The grain refinement of the TiZrAlN nanocomposite thin films was controlled by adjusting the N₂ partial pressure. The hardness of the film varied with the N₂ partial pressure and the maximum value was obtained approximately 47 ㎬. It was also confirmed that there is a critical value of the grain size (dc) to need maximum hardness.