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홍유덕(Y.D.Hong),김종춘(J.C.Kim),조강래(K.R.Cho) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
In Korea, three way catalytic converter equipped cars have been produced by car manufacturers to satisfy more stringent exhaust emission standards since July, 1987. Until now, about 90 percent of registered passenger cars were switched to low emission cars and the exhaust emission from the cars reduced dramatically. But these low emission cars could emit much pollutants because of the deterioration of emission related parts, long driving distance, poor maintenance and bad driving habits. Therefore, periodic inspection and maintenance is needed to reduce the exhaust emission from the cars in use. In this study, 139 vehicles - 94 gasoline vehicles and 45 LPG vehicles - which classified with kinds and mileage were tested by CVS-75 test procedure to know the characteristics of exhaust emission from catalytic converter equipped cars in use.<br/>
공부주,홍유덕,서석준,김영환,한진석,임재현,이동원,홍지형 한국냄새환경학회 2015 실내환경 및 냄새 학회지 Vol.14 No.3
In this study, a correlation analysis of odor was performed in order to assess the reliability and the field applicability of the Odorous gas sensor for continuous real-time monitoring. Hydrogen sulfide was found to have a correlation of 41.5~65.8%, and Ammonia is was found to have very low correlation in less than 200 ppb concentration. Reactivity evaluation result, hydrogen sulfide is the reactivity was higher than the low concentration condition of 100 ppb or less indicated by 31.3~36.4% in the 100 ppb or more high density condition based on the reference density value. For ammonia was very low reactivity in the low-concentration conditions below 200 ppb. TVOC and composite odor assessment did not occur Reactivity no reference concentration value, the specific comparison between both sensors showed a similar trend. In the same Odorous gas sensor accuracy between the result, 40.3~130.6% hydrogen sulfide, ammonia, 69.1~104.9%, TVOCs is 24.7~98.6%, exhibited human odor intensity from 5.5~33.2%.
공부주,한진석,봉춘근,홍유덕,홍지형 한국냄새환경학회 2015 실내환경 및 냄새 학회지 Vol.14 No.4
In this study, odor sensors were evaluated in two areas, which were reproducibility of measurements and linearity and correlation of results. The evaluation of linearity and correlation showed that the linearity of the measurement object substance at low, medium and high concentrations of all intervals, and correlation (R2) also appeared to be quite high, at 0.8 to 0.9. Specific performance evaluation results of ammonia, hydrogen sulfide, TVOC and complex odor sensor to the individual substances are somewhat different, but the result have able tendencies. All odor sensors showed detectable in all metrics at 5 ppb concentration in temperature 25oC, humidity 50%. However, there is needs to be determined that in many cases the standard deviation is 10% or more in 5 ppb, and reproducibility appears in the high concentration region with a standard deviation of less than 10%. Because complex odor sensor (MOS sensor) output value is relatively accurate concentration value for the odor and the reaction was stable, MOS sensor is to be considered methods for measuring the complex odor. Reactivity of ammonia, hydrogen sulfide and TVOC odor sensor to the concentration of individual odor substances stably displayed, but the reactivity of the mixture material showed the same trend, however, the hydrogen sulfide and TVOC sensor reactivity were unstable. There is thus a need to maintain the proper temperature and humidity environmental operating condition of odor sensors.