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김영달,이민명,정창경,Kim, Yeong-Dal,Lee, Min-Myeong,Jeong, Chang-Gyeong 대한전기학회 2000 전기학회논문지 D Vol.52 No.1
Active noise control is an approach to noise reduction in which a secondary noise source that destructively interferes with the unwanted noise. In general, active noise control systems rely on multiple sensors to measure the unwanted noise field and the effect of the cancellation. This paper develops an approach that utilizes a single sensor. The noise field is modeled as a stochastic process, and a time-adaptive algorithm is used to adaptively estimate the parameters of the process. Based on these parameter estimates, a canceling signal is generated. Opppenheim model assumed that transfer function characteristics from the canceling source to the error sensor is only propagation delay. But this paper proposes a modified Oppenheim model by considering transfer characteristics of acoustic device and noise path. This transfer characteristics is adaptively cancelled by adaptive model. This is proved by computer simulation with artifically generated random noise and sine wave noise. The details of the proposed architecture, and theoretical simulation and experimental results of the noise cancellation system for three dimension enclosure are presented in the paper.
단부효과를 (端部效果) 고려한 유도형 Linear motor 의 2차도체판에 유기되는 과전류분포의 분석 (Ⅰ)
이은웅(Eun Ung Lee),장석명(Seok Myeong Jang),이민명(Min Myung Lee) 대한공업교육학회 1981 대한공업교육학회지 Vol.6 No.2
This paper treated of the distribution phenomena of the induced eddy current on the conductive sheet of a linear induction machines. The fundamental data in this study are made reference to improve the characteristics of linear induction motors.