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채유석,송갑득,강봉휘,서무교,이덕동 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
The simple solid electrolyte carbon dioxide sensor was fabricated using Li ionic conductor with a heater and Li_(2)CO_(3)+Na_(2)CO_(3)+K_(2)CO_(3) (47.6 : 25.4 : 27.0) as a metal carbonate auxiliary phase. The electromotive force(EMF) was in excellent agreement with the EMF value calculated from the Nernst' s equation for CO_(2) gas concentration from 950 to 9,950ppm at 420℃, with the response time of 15~25 sec.. Water vapor hardly affected the sensor characteristics for relative humidity from 40% to 90%, in contrast to the case of the Li_(2)CO_(3) and Na_(2)CO_(3) + BaCO_(3)(1 : 1.7). The CO_(2) sensitivity of this sensor was stable for the test period of 240 hours.
알카리 금속 탄산염과 결착제의 혼합물을 감지물질로 하는 고체전해질 가스센서의 CO2 감응 특성
채유석,송갑득,강봉휘,서무교,이덕동 ( Yu Sug Chai,Kap Duk Song,Bong Hwi Kang,Moo Gyo Seo,Duk Dong Lee ) 한국센서학회 1998 센서학회지 Vol.7 No.2
The simple solid electrolyte carbon dioxide sensor with heaters were fabricated by using Li ionic conductor. Two Au electrodes were used for the reference and sensing electrode respectively. Two types of gas sensors, type ( I ) and type ( II ), were fabricated. Type ( I ) sensor was fabricated by the method of melting and crystallizing alkali metal carbonate at the temperature of 420 ∼ 500 ℃. The sensing membrane of type ( II ) sensor was formed by the printing method on sensing electrode after metal carbonate was mixed with binder. The response characteristics of sensors fabricated for the carbon dioxide were investigated for a range of CO₂ concentration from 950 ppm to 9,950 ppm at operating temperature 420 ℃. Type ( I ) sensor and type ( II ) sensor showed the sensitivity of 62 mV/decade and 65 mV/decade respectively. The emf/decade of type ( II ) sensor tested at 420 ℃ almost followed the theoretical value of Nernst`s equation and showed stable response characteristics with the fast response time of 15 ∼ 20 sec. Also type ( II ) sensor showed excellent stability and reproduction properties for 60 days.
박흔동,채유석,문정훈 한국농식품정보과학회 2009 Agribusiness and Information Management Vol.1 No.2
This study proposes development strategies for domestic e-commerce of agricultural products. So far, it grows quantitatively so fast, but because of lack of continuous management, it does not work properly. Previous studies have some outcome for vitalization of e-commerce, but they have limits that they neglect rapid changes of e-commerce circulation structures and practical problems farmers go through when they sell their products. This study deals with these problems more than previous. The first phase of this study analyzes two cases of overseas successful and failure e-commerce sites of agricultural products, for example, Wine.com and Webvan.com. The second phase analyzes As-Is and distribution structure of domestic e-commerce of agricultural products. Finally this study asserts three strategies for domestic e-commerce of agricultural products based on Web 2.0 environment.