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Probe로 급전되는 적층형 원형 마이크로스트립 2소자 배열 안테나의 임피던스 및 상호 결합 특성
이면주,남상욱 한국통신학회 1993 韓國通信學會論文誌 Vol.18 No.11
본 논문에서는 probe로 급전되는 적층형 마이로스트립 2소자 배열 안테나의 임피던스 및 결합특성을 제시하였다. 안테나 구조의 해석에는 벡터 한켈 변환을 이용한 스팩트럴 영역법을 적용하였다. 또한 이 안테나의 임피던스 및 결합특성, 그리고 두 소자 안테나간의 거리에 따른 결합특성 변화등을 측정하여 그 결과를 제시한다. 끝으로, 해석을 통해 계산된 결과와 측정된 결과를 비교하여 두 결과가 잘 일치함을 보였다. In this paper, the coupling characteristics as well as the self and the mutual Impedance of a two-element probe-fed stacked circular microstrip array antennas are presented. A full wave analysis for the structure is performed In the spectral domain using the vector Hankel transform(VHT). Also, we presented measured results for the impedance, the coupling characteristics of the antenna and the variation of the coupling with the distance between the two elements. Finally, the calculated and measured results are shown to agree well wlth each other through comparisons.
$\gamma$-선의 조사를 이용한 하수처리장 방류수 처리에 관한 연구
이면주,정영도,박순달 대한환경위생공학회 1998 대한환경위생공학회지 Vol.13 No.2
This study was carried out for the purpose of industrial reuse of effluent released from activated sludge unit by $\gamma $-ray irradiation technique. The dissolved organic carbon in the effluent of an activated sludge unit is mostly refractory or inert material which are difficult to be degraded by micro organism. The effluent generated from activated sludge unit was irradiated with Co$^{60}$ $\gamma $-ray under condition of air bubbling. The effects of irradiation on the pH, COD, TOC, color, molecular weight distribution were investigated by membrane filtration and u.v.-spectrum analysis. With increasing dose, the TOC was decreased smoothly. The COD was increased at lower dose, while the COD was decreased at higher dose. The TOC and COD, however, were decreased smoothly when TiO$_{2}$ was added to the solution. It was thought that the differential decreasing trend of COD and TOC in according to the absence or presence of TiO$_{2}$ was due to the molecular weight distribution shifted from group of higher molecular weight to group of lower one which are more easy to be decomposed. The removal efficiency of color was 71.5% and it was increased to 85.7% when TiO$_{2}$ was added to the solution. The $\gamma $-ray irradiation was effective on the production of chlorine.
Acetaminophen의 감마선 분해에 대한 산화제 영향
이면주,안영덕,이경훤,이오미,김태훈,정인하,유승호 한국방사선산업학회 2011 방사선산업학회지 Vol.5 No.4
This study was aimed to investigate the effect of oxidants on biodegradability anddecomposition of acetaminophen (ACT) by gamma ray. Three kinds of chemical, potassiumpersulfate, hydrogen peroxide and ferrous sulfate were selected as an oxidant. The absorbed dosewas ranged from 0.2 to 10 kGy and the concentration of oxidants was from 0.1 to 10 mM and theinitial concentration of acetaminophen was 30 mg l-1 in this study. The concentration of ACT wasgradually decreased corresponding to the increase of the absorbed dose. However, mineralizationof ACT was not occurred by the increased of the absorbed dose. When the 10 mM of oxidantsapplied to the ACT aqueous solution, the concentration of ACT was rapidly decreased accordingto absorbed dose and the mineralization was observed in potassium persulfate. Biodegradabilityof ACT with potassium persulfate was higher than that of ACT without potassium persulfate inlower absorbed dose and decreased according to higher absorbed dose.