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김문원,육세진,류태우,Kim, Moon-Won,Yook, Se-Jin,Yu, Tae U 한국입자에어로졸학회 2018 Particle and Aerosol Research Vol.14 No.3
Recently, there has been much research on the effect of ultrafine dust on human body with increasing interest in the ultrafine dust. In the Republic of Korea, there are many old thermal power plants, and the amount of ultrafine dust emitted from the thermal power plants is reported to be about 14% of the total amount of domestic fine dust. Therefore, the amount of fine dust from the flue gas desulfurization facility in the thermal power plant needs be reduced. In this study, we made an experimental setup to simulate a flue gas desulfurization facility and analyzed the physical characteristics of the particles passing through a mist eliminator. Experiments were carried out to investigate the collection efficiency of the mist eliminator by using the Arizona Test Dust in a dry environment, and then spraying limestone slurry into the flue gas desulfurization system equipped with the mist eliminator to examine the size and morphology of limestone particles upstream and downstream of the mist eliminator. Cut-off size of the mist eliminator was formed at about $6{\mu}m$. The result of this study is expected to be helpful for designing an electrostatic precipitator for removing particles passing through the mist eliminator.
석회석 슬러리 입자 제거를 위한 전기집진기 포집효율 평가
이기혁,김문원,류태우,육세진,Lee, Gi-Hyuk,Kim, Moon-Won,Yu, Tae-U,Yook, Se-Jin 한국입자에어로졸학회 2019 Particle and Aerosol Research Vol.15 No.2
Recently, there has been much research on the effect of fine dust on human body with increasing interest in the fine dust. Thermal power plant, which is considered as one of the main sources of fine dust, is reported to be responsible for 14% of the total amount of domestic fine dust in the Republic of Korea. Therefore, dust collecting devices in the thermal power plant need to be improved. In this study, the electrostatic precipitator (ESP) was considered to substitute for a mist eliminator used in flue gas desulfurization facility. By considering real situation in the flue gas desulfurization facility, the collection efficiency of the ESP was evaluated by using the sprayed limestone slurry particles. The collection efficiency of the ESP was higher than that of the mist eliminator, showing the possibility of replacing the mist eliminator with the ESP in flue gas desulfurization facility.
강만일,김문원,김용기,류지욱,장한오,Kang, Man-Il,Kim, Moon-Won,Kim, Yong-Gi,Ryu, Ji-Wook,Jang, Han-O 한국진공학회 2008 Applied Science and Convergence Technology Vol.17 No.3
산소분압비에 따른 ZnO 박막의 성장특성을 알아보기 위해 RF 스퍼터링 시스템을 이용하여 $0%{\sim}30%$의 산소분압비로 박막을 제작하였다. 위상변조방식의 분광타원계를 이용하여 $1.5{\sim}3.8eV$ 범위에 걸쳐 타원상수를 측정하였고, TL 분산관계식을 이용하여 최적맞춤한 결과 박막과 표면기칠기층의 두께, void 비율을 알 수 있었고, ZnO 알갱이의 크기는 산소분압비의 증가에 따라 그 크기가 작아짐을 알 수 있었다. 산소분압비에 따른 ZnO 박막의 밴드 갭은 산소유입량의 증가에 따라 증가하여 ZnO 박막의 광흡수 특성이 산소분압비에 크게 의존함을 알았고, 산소분압비의 증가는 결정의 불완전성을 증가시키는 것으로 나타났다. ZnO thin films were grown on a glass by RF sputtering system with RF power 100W and oxygen partial pressure of $0%{/sim}30%$. Elliptic constants were measured by using a phase modulated spectroscopic ellipsometer and analyzed with the Tauc-Lorentz dispersion formula and best fit method in the range of 1.5 to 3.8eV. Also, scanning electron microscope(SEM) was used for the analysis of surface crystallization condition. From elliptic constants spectra, optical constants, thickness and roughness of ZnO films were evaluated. Total thickness of ZnO films obtained by ellipsometry showed good agreement with SEM data. It was found that the grain size of the films were getting smaller with increasing oxygen partial pressure. Band-gap of ZnO films increase with the oxygen partial pressure. These findings clearly indicate that optical properties of ZnO films are strongly dependent on the oxygen partial pressure. It could be explained that increasing the oxygen partial pressure induced high crystalline imperfection in the ZnO films.
41K, 41Ca 및 41Sc 원자핵의 One Hole 상태
金文元 공주대학교 사범대학 과학교육연구소 1985 과학교육연구 Vol.17 No.1
The one-hole states in nuclei of ?? and ?? have calculated with a model space based on the (??.2P₃/₂)²(1d₃/₂,2S¹/₂)-¹configuration using the nuclear shell model. The two body effective interaction is assumed to be a surface-delda potential. ⁴0Ca is also asumed to be an inert core. Energy spectra and spectroscopic factors are obtained and compared with the experimental data. The calculate results in fair agreement with the observed values.