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Hydroxyapatite 계 세라믹스의 감습특성에 관한 연구
육재호,조기선 ( Jae Ho Yuk,Ki Sun Cho ) 한국센서학회 1997 센서학회지 Vol.6 No.1
Ca_(10)(PO₄)_6(OH)₂ humidity-sensitive devices were fabricated by a solid reaction method, and He humidity-sensitive characteristics were investigated. The impedance decreases with increasing relative humidity, and the good sensitivity is shown in which impedance changes by about 10²Ω over the region of 30∼90 %. Also, It is shown that the humidity sensitivity is stable in temperature variations and long time exposures to the humidity. The sensitivity of the specimens is not affected by a heat treatment, and the hysteresis in one humidity cycle is negligible.
육재호,Yuk, Jae-Ho 대한전자공학회 1998 電子工學會論文誌-T Vol.t35 No.2
$CaSnO_3$ specimens were fabricated by solid reaction method, and their humidity sensitive characteristics have been investigated. Capacitance increases with increasing relative humidity, better humidity sensitivity are shown at lower frequencies. Humidity sensitivity are stable at variable temperatures, and hysteresis phenomenon is shown with adsorption and desorption. Drift phenomenon is exhibited by exposing the specimens in the air, and a decrease of humidity sensitive by contamination is inhibited by heat cleaning. $CaSnO_3$ 시편을 고상반응법에 의해 제작하고, 그의 감습특성에 대해 조사하였다. 커패시턴스는 상대습도가 증가함에 따라 증가하며, 저주파 영역에서 우수한 감습도를 나타냈다. 감습도는 온도변화에 안정되며, 흡습, 탈습에 따라 약간의 히스테리시스 현상이 나타났다. 대기중 노출에 의해 드리프트 현상이 나타나며, 가열클리닝에 의해 오염에 의한 감습도 저하를 방지할 수 있다.
육재호(Jae Ho YUK) 대한전자공학회 2009 電子工學會論文誌 IE (Industry electronics) Vol.46 No.2
에칭법을 이용하여 광섬유 굴절율 센서를 제작하였으며 그의 굴절율 특성을 연구하였다. 굴절율 1.453-1.46 영역에서 우수한 감도를 나타내었으며 측정파장에 의해 동작점이 이동돼었다. 클래딩 두께가 감소할 수록 센서의 감도가 증가하였으며, 감도는 열에 안정된 특성을 나타내었다. 그리고 굴절율의 증감에 따른 히스테리시스가 거의 나타나지 않았다. The optical fiber refractive index sensors were fabricated using etching method and their refractive index characteristics have been investigated. Good sensitivity was shown at the region of 1.452-1.46 refractive index and operating point was shifted by wavelength. The sensitivity of sensor increased with decreasing cladding thickness and was stable with heat treatment. The hysteresis under cyclic refractive index changes was negligible.
육재호,안병준 한국산업안전학회 1993 한국안전학회지 Vol.8 No.4
The streaming current of insulating oil increases with increasing oil velocity and oil amount, A contact potential difference as an energetic state exits in the polymer thin film, both sides of which are contacted by two different metals having different work functions. Accordingly, the potential difference may be a cause for the short circuited transient current flowing through the external circuit. The polymers are electrificated as the electric field is supplied, and the currents flow with increasing temperature.