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원광민(Kwang Min Won),정광석(Kwang Suk Jung) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
Varying the relative position and posture between neighboring PMs constituting magnet wheel around a conductive rod, we can obtain a spiral motion of the rod by only the rotation of the magnet wheel. It gives a chance to convey the rod without mechanical contact. In this paper, the developed conveyance system is given, including the quantitative analysis of a few parameters influencing the force characteristics.
이종규(Lee, Jong-Kyu),조덕형(Cho, Teock-Hyeong),서대원(Seo, Dae-Won),임윤수(Lim, Yun-Soo),원광민(Won, Kwang-Min) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.3
In this paper, a sound quality indices for the evaluation of vehicle intake and exhaust noise were developed through a correlation analysis of objective measurement data and subjective evaluation data. At first, intake and exhaust orifice noise were measured at the wide-open throttle sweep condition. And then, acoustic transfer function between intake orifice noise and interior noise at the steady state condition was measured. Also, acoustic transfer function for exhaust system was measured as the same method. Simultaneously, subjective evaluation was carried out by the paired comparison and semantic differential method by 27 engineers. Next, the correlation analysis between the psycho-acoustic parameters derived from the measured data and the subjective evaluation was performed. The most critical factor was determined and the corresponding sound quality index for the intake and exhaust noise was obtained from the multiple factor regression method. At last, the effectiveness of the proposed index was investigated.