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도로터널 내 공기질 측정과 Bag Filter를 이용한 미세먼지 제거 성능평가
김범석,박일건,정동균,이상돈,홍민선,Kim, Beom-Seok,Park, IL-Gun,Jung, Dong-Gyun,Lee, Sang-Don,Hong, Min-Sun 한국터널지하공간학회 2015 한국터널지하공간학회논문집 Vol.17 No.5
수도권에 있는 4개 도로터널을 선정해 오전 7시부터 오전 9시까지 미세먼지와 벤젠을 측정한 결과 PM10은 $111{\sim}268{\mu}g/m^3$으로 연간 대기환경기준치인 $50{\mu}g/m^3$을 2~5배 이상 초과하였고 PM2.5는 $35{\sim}65{\mu}g/m^3$으로 대기환경기준치인 $25{\mu}g/m^3$을 1.5배~2.5배 초과 하였다. 벤젠의 경우 300~500 ppb로 나타나 대기환경기준치인 1.5 ppb의 200~330배 초과하였다. 국내 장대터널에서 4개월 연속 측정한 결과 PM10의 경우 $30{\sim}400{\mu}g/m^3$으로 나타났고 Bag filter를 이용한 PM10의 제거효율은 97% 이상으로 나타나 향후 터널 내 대기질 개선에 기여할 것으로 판단된다. 벤젠의 경우 250~350 ppb로 측정되었다. Air quality was monitored in four roadway tunnels located near Seoul metropolitan area from 7:00AM to 9:00AM. PM10 concentrations range $111{\sim}268{\mu}g/m^3$, which are 2~5 times higher than annual standard $50{\mu}g/m^3$, and PM2.5 concentrations range $35{\sim}65{\mu}g/m^3$, which are 1.5~2.5 times higher than annual standard $25{\mu}g/m^3$. Benzene concentrations range 300~500 ppb, which are 200~300 times higher than 1.5 ppb which is air quality standard. Four-month long term air quality monitoring and test results in one of long tunnels show that PM10 range $30{\sim}400{\mu}g/m^3$ and over 97% of them can be removed by bag filter, effectively. Finally, benzene concentrations range 250~350 ppb.
단주효과 및 고유주기를 고려한 비내진 학교시설의 반응 수정계수
김범석,박지훈,Kim, Beom Seok,Park, Ji-Hun 한국지진공학회 2019 한국지진공학회논문집 Vol.23 No.4
Response modification factors of school facilities for non-seismic RC moment frames with partial masonry infills in 'Manual for Seismic Performance Evaluation and Retrofit of School Facilities' published in 2018 were investigated in the preceding study. However, since previous studies are based on 2D frame analysis and limited analysis conditions, additional verification needs to be performed to further apply various conditions including orthogonal effect of seismic load. Therefore, this study is to select appropriate response modification factors of school facilities for non-seismic RC moment frames with partial masonry infills by 3D frame analysis. The results are as follows. An appropriate response modification factor for non-seismic RC moment frames with partial masonry infills is proposed as 2.5 for all cases if the period is longer than 0.6 seconds. Also if the period is less than 0.4 seconds and the ratio of shear-controlled columns is less than 30%, 2.5 is chosen too. However, if the period is less than 0.4 seconds and the ratio of shear-controlled columns is higher than 30%, the response modification factor shall be reduced to 2.0. If the period is between 0.4 and 0.6 seconds, then linearly interpolates the response correction factor.
건강한 축산물 생산으로 가는 길 - 친환경축산의 필요성과 대책
김범석,Kim, Beom-Seok 대한양계협회 2014 월간 양계 Vol.46 No.5
본고에서는 국내 친환경축산에 대해 정의를 먼저내리고, 국내 친환경축산의 현황을 살펴보고자 한다. 그리고 국내 친환경축산의 문제점 및 개선방안을 제시하여 앞으로 국내 친환경이 나아가야 하는 방향을 나타내고자 한다.
K-DEMO 핵융합실증로의 에너지원항: 중수소-삼중수소 반응에 따른 블랑켓 및 디버터 구조물의 붕괴열과 비방사능 평가
김범석(Beom Seok Kim),임기학(Kihak Im),김홍택(Hong-tack Kim),권성진(Sungjin Kwon),홍석호(Suk-ho Hong) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
In the preliminary research phase, we quantify potential energy from the activation of major in-vessel components such as breeding blanket and divertor due to neutron generation during a D-T fusion reaction in K-DEMO. After two years of full fusion operation of K-DEMO, the decay heat which readily provokes potential behavior of hazardous inventories is estimated as 55.6 ㎿ and 8.40 ㎿ from activated blankets and divertors, respectively. Particularly tungsten first wall of an equatorial blanket shows a considerable amount of decay heat of 149 W/㎏, while it is about 92.3 W/㎏ for a structural material of reduced activation ferritic martensitic (RAFM) steel. Local specific radioactivity in the blanket reaches 2.42×1015 Bq/㎏, and 2.39×1014 Bq/㎏ for W first wall and RAFM steel structures, respectively. We will demonstrate the cooling temperature as a function of decay time is an important factor to assess thermal behavior of breeding blanket and divertor, and it should be implemented into safety system to secure the components as intact as possible against thermal failure. We will show that all in-vessel components can be managed within low level limits on their activation in accordance with regulatory guidelines for nuclear safety concerns. The results of this study will be implemented in a pre-conceptual design of K-DEMO and will contribute to the establishment of a regulatory framework.