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자기포화를 고려한 $\pi$형 모델 유도기의 적응 선형화 기법 제어
김도우,정기철,이승학,김홍필,Kim Do-Woo,Jung Gi-Chul,Lee Seng-Hak,Kim Hong-Phil 대한전기학회 2004 전기학회논문지 D Vol.53 No.10
In this paper, we proposed that the problem of controlling induction motor with magnetic saturation, is studied from an input-output feedback linearization with adaptive algorithm. is considered. An adaptive input-output feedback linearizing controller is considered under the assumption of known motor parameters and unknown load torque. In order to achieve the speed regulation with the consideration of improving power efficiency, rotor angular speed and flux amplitude tracking objectives are formulated. Simulation results are provided for illustration.
송애희(Song Ae Hee),송진대(Song Jin Dae),김현식(Kim Hyeon Sig),정기철(Jung Gi Chul) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.4
Vertical pumps are structurally weak in terms of vibration because of installed heavy motor on top of the pumps in form of cantilever. So high vibration on top of the pumps can occur with low vibration in the bottom. These vibration problems experienced very frequently. Majority of studies have been related to the unbalance of rotating parts or structural resonance. In this paper, we introduce an unusual case, vibration variation caused by VPF(Vane Passing Frequency) according to water level.
강변 토양내 중금속 분석에서 새료 채취 지점 선정방법에 따른 결과들의 통계적 비교
박광재,문병철,송현정,정종학,정기호 한국환경과학회 1997 한국환경과학회지 Vol.6 No.1
In investigating heavy metal contents at specific areas, the method of selecting sampling points is important. A general method is, according to the law <Official Environmental Pollution Test Method>, random sampling of zigzag-form in the selected field. In this work, we studied whether the measured values obtained from a certain method of selecting sampling points is a representative of heavy metal contents in the selected field or not. The selected field for this study is located on the lower Yangsan-river; Gasan-li, Mulgum-myon, Yangsan-gun, KyoungNam. 1 km away from the main stream of Nakdong river. The heavy metals investigated were Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn. The inductively coupled plasma(ICP) atomic emission spectrometer was used to measure these metals quantitatively. The number of total sampling points were 24. We compared the total mean values with the mean obtained from various methods of selecting sampling points.