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유클리디언 거리 기반의 단계적 소거 방법을 통한 화학센서 어레이 성능 최적화
임해진 ( Hea Jin Lim ),최장식 ( Jang Sik Choi ),전진영 ( Jin Young Jeon ),변형기 ( Hyung Gi Byun ) 한국센서학회 2015 센서학회지 Vol.24 No.4
In order to prevent drink-driving by detecting concentration of alcohol from driver`s exhale breath, twenty chemical sensors fabricated. The one of purposes for sensor array which consists of those sensors is to discriminate between target gas(alcohol) and interference gases(CH3CH2OH, CO, NOx, Toluene, and Xylene). Wilks`s lambda was presented to achieve above purpose and optimal sensors were selected using the method. In this paper, step-wise sensor elimination based on Euclidean distance was investigated for selecting optimal sensors and compared with a result of Wilks`s lambda method. The selectivity and sensitivity of sensor array were used for comparing performance of sensor array as a result of two methods. The data acquired from selected sensor were analyzed by pattern analysis methods, principal component analysis and Sammon`s mapping to analyze cluster tendency in the low space (2D). The sensor array by stepwise sensor elimination method had a better sensitivity and selectivity compared to a result of Wilks`s lambda method.
MPEG-V(ISO/IEC 23005) 표준적용이 가능한 전자코 시스템 구현
임해진 ( Hea-jin Lim ),최장식 ( Jang-sik Choi ),전진영 ( Jin-young Jeon ),변형기 ( Hyung-gi Byun ) 한국센서학회 2016 센서학회지 Vol.25 No.6
MPEG-V(ISO/IEC 23005) standardizes normative sensory effects metadata and sensory devices command for adapting the sensory effects between the virtual world and the real world. MPEG-V(Virtual) standardization has been carried out by 3DG(Dimensional Graphics) ad-hoc group inside MPEG Working Group(ISO IEC JTC1/SC29/WG11). For the scent effect, one of the sensory effects within MPEG-V, we proposed an olfactory interaction model including electronic nose and scent display to the ad-hoc group. Recently, we proposed types and elements related to the electronic nose as a sensor defined in MPEG-V standard for olfactory interaction. At the 114th MPEG meeting, the types and elements were consequently reflected on MPEG-V CD(Committee Draft) 4th edition. In this paper, we implement an electronic nose system applicable to MPEG-V standard by using MPEG-V schema, encoder, and decoder in order to assess their adequacy.
최장식 ( Jang Sik Choi ),전진영 ( Jin Young Jeon ),변형기 ( Hyung Gi Byun ),임해진 ( Hea Jin Lim ) 한국센서학회 2013 센서학회지 Vol.22 No.4
This paper presents to analyze patterns from single and complex malodors using gas sensor array based on metal oxide semiconductors. The aim of research is to identify and discriminate single malodors such as NH3, CH3SH and H2S and their mixtures according to concentration levels. Measurement system for analyzing patterns from malodors is constructed by an array of metal oxide semiconductor sensors which are available commercially together with associate electronics. The patterns from sensory system are analyzed by Principal Component Analysis (PCA) which is simple statistical pattern recognition technique. Throughout the experimental trails, we confirmed the experimental procedure for measurement system such as sensors calibration time and gas flow rate, and discriminated malodors using pattern analysis technique.