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김진상 ( Jin Sang Kim ),정용철 ( Yong Chul Jung ),강종윤 ( Chong Yun Kang ),김달영 ( Dal Young Kim ),남창우 ( Chang Woo Nam ),윤석진 ( Seok Jin Yoon ) 한국센서학회 2005 센서학회지 Vol.14 No.3
N/A This paper describes the development of a surface acoustic wave gas sensor that is designed to detect volatile gas by monitering phase change of output signal as a function of time. The sensor consists of SAW oscillators with a center frequency of 100 MHz fabricated on 128 ?Y-Z LiNbO3 substrates. Experimental results, which show the phase change of output signal under the absorption of volatile gas onto sensors, are presented. The proposed sensor has the properties of high sensitivity compare to the conventional SAW gas sensor and chemical selectivity. Thus, it is thought these results are applicable for use in sensor array of an high performance electronic nose system.
전차선로에서의 뇌격에 의한 가공지선과 보안기의 차폐효과
임성정(Seong-Jeong Rim),김재철(Jae-Chul Kim),창상훈(Sang-Hun Chang),정용철(Yong-Chul Chong) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
Using the EMTP(Electro Magnetic Transient Program) for the analysis of lightning direct voltage on the railway system, the shielding effects of overhead grounding wire on the railway were studied quantitatively. Installation of overhead ground wire and gap-type arrester such as s-horn provides a 6.6㎸ HV distribution line with good protection effects. Even severe lightning induced voltage were create, 6.6㎸ HV lines can be withstand.