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오늘 본 자료
이덕동,박길흠,최두현,한대현,백운이,임정옥,황태진 ( Duk Dong Lee,Kil Heum Park,Doo Hyun Choi,Dae Hyun Han,Woon Yi Baek,Jeong Ok Lim,Tae Jin Hwang ) 한국센서학회 1998 센서학회지 Vol.7 No.5
A new human sensibility (kansei) meter that can measure human sensibility at the indoor environment is developed in this paper. Four sensors that can measure temperature, humidity, CO₂ and C₄H_(10) concentrations are used. Among these sensors, the first three are used to determine the human sensibility, And the last to protect human from the harmful gas. First of all, human sensibilities are defined for each sensor datum, and then those are linearly combined to make a final human sensibility (kansei). The efficiency and usefulness of the meter are verified using a simulator on Windows 95 and a stand-alone system constructed using a microprocessor.
마이트로 가스센서를 위한 저전력 마이크로 히터의 제조 1 . 유한요소법에 의한 열분포해석
이덕동 ( Duk Dong Lee ),정완영 ( Wan Young Chung ),임준우 ( Jun Woo Lim ),노보루야마조에 ( Noboru Yamazoe ) 한국센서학회 1997 센서학회지 Vol.6 No.4
The micro heater with PSG/Si₃N₄ diaphragm and platinum heater pattern was designed for micro-gas sensor fabrication. The platinum heater and the platinum electrode for sensing layer were designed on that same plane and fabricated in the single photolithography process. The thermal analyses including temperature distribution over the diaphragm and power consumption of the heater were carried by finite t m. The thermal properties of the microsensor with both heater and tensing electrode on the same plane was compared with that of the typical microsensor which had the structure of sensing layer/insulator/heater on the diaphragm.
Pt전극을 사용한 SnO2( Ca )/Pt 후막소자의 탄화수소계가스에 대한 감응 특성
홍영호,이덕동 ( Young Ho Hong,Duk Dong Lee ) 한국센서학회 1995 센서학회지 Vol.4 No.2
A coprecipitation method as used for preparing Ca and Pt doped SnO₂-based material. Crystallite site and specific surface area are investigated by TEM, XRD and BET analysis. SnO₂(Ca)/Pt based thick film devices were prepared by a screen printing technique for hydrocarbon gas detecting. $quot;then the electrical and sensing characteristics of devices were investigated. Ca and Ft addition, the crystal growth of SnO₂ was suppressed during calcining and sintering, and the sensitivity of SnO₂ (Ca)/Pt thick film to gas was enhanced. Also any difference in the sensing toroperties has to be attributed to the Pt and 1u electrode. For the 200 ppm CH₄ the sensitivity of SnO₂(Ca)/Pt thick film devices were about 83% at an operating temperature of 400℃.
γ-Fe2O3 후막형 (厚膜形) 가스센서의 가스 감지특성에 (感知特性) 미치는 첨가물의 (添加物) 효과 (效果)
최동한,이덕동 ( Dong Han Choi,Duk Dong Lee ) 한국센서학회 1993 센서학회지 Vol.2 No.2
The effects of additives on the sensitivity of γ-Fe₂O₃ based hydrocarbon gas sensors have been studied. The 5wt% ZrO₂-doped γ-Fe₂O₃ thick film heat treated at 400 ℃ for 2 hours in air showed the highest sensitivity and selectivity for butane. The response time and recorvery time of the film for 1000 ppm butane in air were 20 sec. and 3 min., respectively, at an operating temperature of 350 ℃.
이재현,이덕동 ( Jae Hyun Lee,Duk Dong Lee ) 한국센서학회 1994 센서학회지 Vol.3 No.2
Potentiometric cell oxygen sensors using CaF₂ were fabricated for monitering the oxygen partial pressure in the low temperature range (300℃∼500℃). The disk type oxygen sensors consist of a reference electrode : Air(O₂:21%)|Pt. a solid electrolyte CaF₂, and a sensing metel Pt electrode. And the change in open circuit emf of the disk type cell was about 45mV for the oxygen concentration range, 0.1%∼10%, at the cell temperature of 400. Also, the reference electrode incorporated type sensor showed the change of 40mV for 0.19% to 10% oxygen partial pressure range.