In this study, the distribution characteristics of particulate matter (PM) in subway platforms were investigated, and the performance of hybrid filter systems was determined through the removal efficiency of PM according to various flow rates and filter structures. The hybrid filter systems were constructed in magnetic systems as (Magnet-Magnet (MM) filters and Magnet-Cascade (MC) filters). PM removal efficiencies of these filters were investigated at a subway platform for three days including weekdays and weekends. The compositions of collected PM were also analyzed. Based on the PM measurement in the subway platforms, it was confirmed that the operation of trains had a significant effect on the increase of PM concentration, and a large number of PMs were less than 1 μm in size. For the MC filter, the removal efficiency of PM1 based on the number of particles was up to 30.5%, demonstrating a relatively high removal efficiency in comparison with the MM filter. In terms of PM10, PM removal efficiencies of the MC filter with respect to the mass concentration and the number of particles were 48.3% and 14.5%, respectively. For the MC filter, it was found that the PM removal efficiency was enhanced with the increase in the flow rate. Moreover, the relatively large particle size PM (i.e., 7.5 μm - 10 μm) denoted a maximum removal efficiency of 97% in terms of the number of particles. All PMs collected by the filter were Fecontaining PMs. As a field experiment using the hybrid filter, the applicability of magnetic particle control technology was approved. Based on this result, it is expected that this study will be used as background research for the development of fine dust control technologies in a subway environment.

Abstract
1. 서 론
2. 연구 방법
    2.1 하이브리드 필터 시스템
    2.2 장소 선정 및 연구 기간
    2.3 PM 농도 측정 및 데이터 산정
    2.4 포집 PM 구성성분 분석
3. 결과 및 고찰
    3.1 지하철 승강장 PM 분포 특성
    3.2 하이브리드 필터 시스템 평가
    3.3 포집 미세입자의 성분 분석
4. 결 론
감사의 글
References

• 오용환(한국원자력연구원 방사선연구부,한양대학교 건설환경공학과) | Yong-Hwan Oh (Department of Radiation Research, Korea Atomic Energy Research Institute, Department of Civil and Environmental Engineering, Hanyang University)
• 손윤석(부경대학교 지구환경시스템과학부) | Youn-Suk Son (Division of Earth Environmental System Science, Pukyong University) Corresponding author
• 최인영(건국대학교 사회 환경공학부) | In-Young Choi (Department of Civil and Environmental Engineering, Konkuk University)
• 딘브엉(건국대학교 사회 환경공학부) | Trieu-Vuong Dinh (Department of Civil and Environmental Engineering, Konkuk University)
• 정상귀(건국대학교 사회 환경공학부) | Sang-gui Jung (Department of Civil and Environmental Engineering, Konkuk University)
• 김조천(건국대학교 사회 환경공학부) | Jo-Chun Kim (Department of Civil and Environmental Engineering, Konkuk University) Corresponding author