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한방우,김학준,김용진,김한석,Han, Bangwoo,Kim, Hak-Joon,Kim, Yong-Jin,Kim, Han-Seok 대한기계학회 2013 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.1 No.1
에너지 소비량 증가 및 고유가로 인한 에너지 자원 수급의 불안정 상황에서 새로운 차세대 에너지원으로 셰일가스가 관심을 받고 있다. 셰일가스는 풍부한 매장량과 고른 지역적 분포로 인해 기존의 에너지 역학 구도까지 바꿀 것으로 기대되고 있다. 셰일가스의 개발과정은 시추와 파쇄 및 생산의 과정으로 이루어지는데 이러한 셰일가스 개발과정에서 요구되는 수평시추, 수압파쇄 등의 핵심 기술과 개발과정에 발생하는 환경 이슈문제, 그리고 이를 해결하기 위한 추가 요구 기술과 현재의 연구 진행 현황 등을 살펴보고자 한다. Shale gas is in the limelight as one of the new energy sources under the circumstances of unstable energy supply and high energy consumption. It is expected to change dynamics of global energy markets due to its abundant resources and global distribution. Shale gas extraction process consists of drilling, fracturing and production. We have surveyed the technologies required for shale gas developments such as a horizontal drilling, a hydraulic fracturing and so on, the environmental issues occurred during the development, the additional technologies to solve the environmental problems and the current research and developments status.
서울 초등학교 교실의 PM<sub>2.5</sub> 및 PM<sub>10</sub> 제거를 위한 학교용 공기청정기 실증
한방우,홍기정,신동호,김학준,김용진,김상복,김상우,황청하,노광철,Han, Bangwoo,Hong, Keejung,Shin, Dongho,Kim, Hakjoon,Kim, Yongjin,Kim, Sangbok,Kim, Sangwoo,Hwang, Cheongha,Noh, Kwangchul 한국입자에어로졸학회 2019 Particle and Aerosol Research Vol.15 No.2
It is important to control fine particles in children care centers, elementary schools, elderly care facilities and so on where vulnerable children and the aged stay during most of their time. This study has investigated $PM_{2.5}$ and $PM_{10}$ concentrations in two classrooms equipped with an air cleaner and two air cleaners, respectively and they were compared to those in a classroom without an air cleaner as well as those outdoors. Eight air cleaners which have various clean air delivery rates (CADRs) between 9.9 and $21.3m^3/min$ were tested in classrooms in two elementary schools in Seoul. Average $PM_{2.5}$ and $PM_{10}$ were $7.3{\pm}0.7$ and $45.5{\pm}4.1{\mu}g/m^3$ in classrooms equipped with an air cleaner and $4.2{\pm}0.6$ and $24.6{\pm}2.5{\mu}g/m^3$ in classrooms with two air cleaners, whereas they were $22.1{\pm}2.6$ and $109.1{\pm}9.6{\mu}g/m^3$ in classrooms without an air cleaner and $36.9{\pm}5.1$ and $74.1{\pm}10.6{\mu}g/m^3$ outdoors, respectively. $PM_{2.5}$ in classrooms could be reduced effectively by using an air cleaner or two air cleaners, because $PM_{2.5}$ was mainly infiltrated from outdoors, however $PM_{10}$ could not because $PM_{10}$ was mainly caused indoors by students' activities. Air cleaners were more effective for removal of $PM_{2.5}$ and $PM_{10}$ in classrooms with a high airtightness than those in classrooms with a relatively low one. Average $CO_2$ in classrooms was about 1500 to 2000 ppm for class hours dependent on the student number per a classroom, which was about 1.5 to 2 times higher than the standard, regardless of the use of air cleaner.
전기집진기의 10 nm 급 초미세 나노입자의 하전 및 집진 특성
한방우(Bangwoo Han),김학준(Hak-Joon Kim),김용진(Yong-Jin Kim),송동근(Dong-Keun Song),홍원석(Won-Seok Hong),신완호(Wan-Ho Shin) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.10
전기집진에서의 10 nm 급 초미세 나노입자의 하전 및 집진 특성을 파악하였고, 나노입자의 확산효과와 비교해 보았다. 나노입자의 하전율과 확산손실 효과의 지배력에 따라 전기집진기에서의 나노입자 집진효율이 결정되는 것을 확인할 수 있었다. 10nm 급 영역에서는 입자 크기가 작아질수록 지속적으로 집진효율이 감소하였다. 10 nm 이하의 영역에서는 나노입자의 부분적 하전효과가 전기집진기 내의 확산손실 효과보다 지배적인 것을 알 수 있었다. 10 nm 이하의 나노입자에 대하여 집진효율 실험 결과가 단극 확산 하전 이론을 적용한 입자하전율 계산 결과와도 잘 일치하였다. The charging of 10-nm-class nanoparticles in an electrostatic precipitator (ESP) according to particle charging ratio has been investigated and compared to the diffusion effect of the nanoparticles. The competition between the charging probability and the diffusion loss effect determines the collection efficiency of nanoparticles in the ESP. The collection efficiency of nanoparticles decreased continuously with decreasing particle diameter. This indicates that the partial charging effect of 10-nm-class nanoparticles is more dominant than their diffusion loss effect in the ESP for nanoparticles in the particle size range of less than 10 nm. The charging ratios based on unipolar diffusion charging calculations were in good agreement with the experimental collection efficiencies for nanoparticles less than 10 nm in diameter.
실내 공기청정기의 오존 발생량 및 음이온 발생의 상관 특성
한방우(Bangwoo Han),김용진(Yong-Jin Kim),김학준(Hak-Joon Kim),김영복(Yong-Bok Kim),장성기(Seong-Ki Jang),이우석(Woo-Seok Lee) 한국실내환경학회 2006 한국실내환경학회지 Vol.3 No.4
Ozone has become a significant pollutant not only outdoors but also indoors. The ozone emission test was conducted for the sum of forty five air cleaners selected in the online shops and department stores. Negative ion emission test was also conducted for the selected fifteen ones which had the function to generate negative ions. Filter-type and complex type air cleaners emitted ozone less than 0.05 ppm, the standard of indoor ozone emission of air cleaner. Wet type ones emitted no ozone. In the case of ionizer type, 66.7% in the nine ones emitted ozone about 1.4~10 times larger than 0.05ppm. Most of air cleaners used a pin corona discharge emitted large amount of ozone. Those which used carbon fiber emitted little ozone in spite of generating a lot of negative ions.
한방우(Bangwoo Han),김학준(Hak-Joon Kim),김용진(Yong-Jin Kim),송동근(Dong-Keun Song),홍원석(Won-Seok Hong),신완호(Wan-Ho Shin) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
전기집진에서의 10 ㎚ 급 초미세 나노입자의 하전특성을 파악하였고, 나노입자의 확산효과와 비교해 보았다. 나노입자의 하전율과 확산손실 효과의 지배력에 따라 전기집진기에서의 나노입자 집진효율이 결정되는 것을 확인할 수 있었다. 10 ㎚ 급 영역에서는 입자 크기가 작아질수록 지속적으로 집진효율이 감소하였다. 10 ㎚ 이하의 영역에서는 나노입자의 부분적 하전효과가 전기집진기 내의 확산손실 효과보다 보다 지배적인 것을 알 수 있었다. 10 ㎚ 이하의 나노입자에 대하여 집진효율 실험결과가 단극 확산 하전 이론을 적용한 입자하전율 계산 결과와도 잘 일치하였다. The charging of 10 ㎚-class nanoparticles in an electrostatic precipitator (ESP) according to particle charging ratio has been investigated and compared to diffusion effect of the nanoparticles. The competition between charging probability and diffusion loss effect determines the collection efficiency of nanoparticles in the ESP. Collection efficiency of nanoparticles continuously decreased with decreasing the particle diameter. This indicates that partial charging effect of 10 ㎚-class nanoparticles is more dominant than their diffusion loss effect in the ESP for the nanoparticles in the particle size range less than 10 ㎚. Charging ratios based on unipolar diffusion charging calculation were in good agreement with the experimental collection efficiencies for the nanoparticles less than 10 ㎚ in diameter.