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개인 휴대 단말기 (PDA)를 기반으로 한 휴대용 E-Nose의 개발
양윤석 ( Yoon Seok Yang ),김용신 ( Yong Shin Kim ),하승철 ( Seung Chul Ha ),김용준 ( Yong Jun Kim ),조성목 ( Seong Mok Cho ),표현봉 ( Hyeon Bong Pyo ),최창억 ( Chang Auck Choi ) 한국센서학회 2005 센서학회지 Vol.14 No.2
The electronic nose (e-nose) has been used in food industry and quality controls in plastic packaging. Recently it finds its applications in medical diagnosis, specifically on detection of diabetes, pulmonary or gastrointestinal problem, or infections by examining odors in the breath or tissues with its odor characterizing ability. Moreover, the use of portable e-nose enables the on-site measurements and analysis of vapors without extra gas-sampling units. This is expected to widen the application of the e-nose in various fields including point-of-care-test or e-health. In this study, a PDA-based portable e-nose was developed using micro-machined gas sensor array and miniaturized electronic interfaces. The rich capacities of the PDA in its computing power and various interfaces are expected to provide the rapid and application specific development of the diagnostic devices, and easy connection to other facilities through information technology (IT) infra. For performance verification of the developed portable e-nose system, Six different vapors were measured using the system. Seven different carbon-black polymer composites were used for the sensor array. The results showed the reproducibility of the measured data and the distinguishable patterns between the vapor species. Additionally, the application of two typical pattern recognition algorithms verified the possibility of the automatic vapor recognition from the portable measurements. These validated the portable e-nose based on PDA developed in this study.
하승철,박찬량 국민대학교 2002 기초과학연구소 논문집 Vol.21 No.-
O(³P_(J))를 NO₂를 355nm로 광분해하여 생성시켰다. O(³P_(J))와 PH₃ 반응에서 생성된 OH(X²П, v″=1,2)의 내부의 에너지 분포를 레이저 유발 형광법으로 측정하였다. 이 반응에서 생성된 OH는 진동 에너지 분포 역전을 보이며, P(v″=2)/P(v″=1) = 3.6, 이는 산소 원자에 의한 수소탈취반응 메커니즘을 보여 준다. PH₃과 산소원자와의 충돌의 반응채널에 대한 자세한 동역학을 논의하였다. O(³P_(J)) is formed by photolysis of NO₂ at 355nm. The OH(X²П, v"=0,1) internal state distributions following the reaction of O(³P_(J)) with PH3 was measured using laser-induced fluorescence. The OH product following the reaction revealed vibrational population inversion, P(v"=2)/P(v"=1) = 3.6, which supports a mechanism involving a direct abstraction of the hydrogen by atomic oxygen. The detailed dynamics of oxygen atom collision with phosphine were discussed as well as the possible reaction channels.