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아파트 실내 환경에서 실시간 측정시스템을 활용한 HONO 농도 측정 및 생성기작 연구
박승식(Seung Shik Park),홍진의(Jin H. Hong),이재훈(Jai H. Lee),김영준(Young J. Kim),조성용(Sung Y. Cho),김승재(Seung J. Kim) 한국대기환경학회 2008 한국대기환경학회지 Vol.24 No.1
Nitrous acid (HONO) can be produced by heterogenous reactions of nitrogen dioxide on surface materials and direct emission from combustion sources. However, a little is known of indoor HONO levels or the relationship between residential HONO, NO, and NO₂ concentrations in occupied houses. Therefore, we measured simultaneously NO, NO2, and HONO concentrations in living room of an apartment using continuous analyzers to study the production of HONO (June 22~30, 2006). The 4-min average concentrations of indoor NO, NO₂, and HONO were 4.3 (range: 0.4~214.3), 10.3 (2.0~87.3), and 1.8 ppb (0.3~7.7), respectively. Peak levels of HONO up to 7.7 ppb and 24-hr averages as high as 1.7 ppb were measured. In agreement with previous studies, indoor HONO concentrations increased during operation of an unvented gas range. Examination of the observed kinetics suggests that the secondary production of indoor HONO, possibly as a result of heterogeneous reactions involving NO₂ and H₂O is associated with [NO₂]²[H₂O] (r²=0.88) rather than with [NO][NO₂][H₂O] (r²=0.75). Three combustion experiments at nighttime were also carried out to investigate the effects of vented combustion on the HONO, NO, and NO₂ concentrations. It was found to release HONO for 10~15 minutes after NO and NO₂ source was turned off, and peak values were finally attained. Compared to unvented combustion, peak NO₂ and HONO concentrations were 3.2 and 2.0 times lower at weak vented combustion (air flow: 340㎥/hr) and 4.9 and 2.4 times lower at strong vented combustion (air flow: 540 ㎥/hr), respectively, emphasizing importance of operating ventilation hood fan during combustion to improve indoor air quality.
이재훈(J.H. Lee),이수강(S.G. Lee),이병주(B.J. Yi),이석희(S.H. Lee),이정헌(J.H. Lee),김희국(W.K. Kim) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
In this study, a spatial 3-dof haptic mechanism is implemented. The implemented mechanism does not employ the gear transmissions as velocity reducers for all three joints but uses wire-based transmissions, thereby it is able to minimize the frictions significantly. Also, by employing the structure of the four-bar mechanism to drive third joint from close to the base, the mechanism is able to minimize the inertia effect from the third actuator very effectively. Its kinematic analysis such as position and velocity analyses are performed first. Then, its operating software development, hardware implementation, and the related interfaces between a PC and the implemented Haptic device are completed. To evaluate its potential and its performance as a haptic device, a experiment generating a virtual constraint in a operational task space is conducted and preliminary results are discussed.
이재훈(J. H Lee),신철준(C. J. Shin),전기영(K. Y. Jeon),박춘우(C. W. Bak),전지용(J. Y. Chun),이상집(S. C. Lee),오봉환(B. H. Oh),정춘병(C. B. Chung),한경희(K. H. Han) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
There is an application which uses smoothing reacter connecting each of the phases in order to make the system smaller comparison with an application using the insulating transformer in the utility interactive photovoltaic generation system using the PWM converter. In this case, there might be the occurence of the unbalance of output voltage, by the difference of smoothing reactor, connected on each of the lines. Therefore this study proposes that the method which maintains the balance and compensates the unblance which occured by the different volume of the smoothing reactor connected on each of the lines.
이재훈(J. H Lee),김은기(E. G Kim),전기영(K. Y Jeon),전지용(J. Y Chun),이승환(S. H Lee),오봉환(B. H Oh),이훈구(H. G Lee),한경희(K. H Han) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
In this paper, The authors design the current controller which independently control the d, q axis current transformed by the synchronously rotating d, q axis and a Space Vector Pulse Width Modulation(SVPWM) to steadily control the output DC-Link voltage against the variable load of the three phase PWM converter. Also, This study improves the high power factor, stability, and rapid response by the phase angle control using the digital Phase Locked Loop(PLL).