K. Y. Kim, Y. S. Kim, Y. M. Roh, C. M. Lee, C. N. Kim, "Spatial distribution of particulate matter (PM10 and PM2.5) in Seoul Metropolitan Subway stations," Journal of Hazardous Materials, vol. 154, no. 1-3, pp. 440-443, 2008.

Y. Lee, Y.-C. Lee, T. Kim, J. S. Choi, D. Park, "Sources and characteristics of particulate matter in subway tunnels in Seoul, Korea," International Journal of Environmental Research and Public Health, vol. 15, no. 11, 2018.

International Agency for Research on Cancer (IARC), "Outdoor air pollution a leading environmental cause of cancer deaths," 2013. IARC Press Release no. 221

D. Park, T. Lee, D. Hwang, W. Jung, Y. Lee, K. Cho, D. Kim, K. Lee, "Identification of the sources of PM10 in a subway tunnel using positive matrix factorization," Journal of the Air & Waste Management Association, vol. 64, pp. 1361-1368, 2014.

E.-S. Lee, T.-J. Lee, M.-B. Park, D.-S. Park, D.-S. Kim, "Characteristics of Particulate Matter Concentration and Classification of Contamination Patterns in the Seoul Metropolitan Subway Tunnels," Journal of Korean Society for Atmospheric Environment, vol. 33, no. 6, pp. 593-604, 2017.

S. Park, T.-J. Lee, H.-K. Ko, S.-J. Bae, S.-D. Kim, D. Park, J.-R. Sohn, D.-S. Kim, "Identification of PM10 Chemical Characteristics and Sources and Estimation of their Contributions in a Seoul Metropolitan Subway Station," Journal of Korean Society for Atmospheric Environment, vol. 29, no. 1, pp. 74-85, 2013.

H.-R. Cho, I.-C. Kim, H.-M. Park, K.-W. Lee, C.-M. Park, W.-S. Oh, J.-I. Youn, J.-R. Kim, J.-M. Kim, "A Study on the Contact Characteristics of the Contact wire and the Pantograph in the Curved Section of the Rigid Overhead Catenary," pp. 1898-1900, Proceedings of the 52nd KIEE Summer Conference, 2021.

H.-R. Cho, J.-I. Youn, J.-M. Kim, "A Study on the Cause of Uneven Wear of the Catenary in the Curved Section of the R-bar Catenary," The Transactions of the Korean Institute of Electrical Engineers, vol. 71, no. 2, pp. 463-467, 2022.

Y. Park, H.-C. Kim, J.-U. Kim, C.-M. Park, H.-S. Jung, W.-S. Choi, Y.-S. Choi, "Polymer Insulator for Electric Railway Comprising Hydrophobic Coating Layer and Method for Preparing the Same," Korean Patent Application Publication KR20140009864A, 2014.

MOLIT Notification No. 2018-27, "Technical Standards for Railway Facilities," Ministry of Land, Infrastructure and Transport (MOLIT), 2018. MOLIT Notification No. 2018-27

S.-H. Woo, G.-N. Bae, J. B. Kim, M. R. Kim, H. G. Park, H. R. Jang, H.-H. Yoon, M. S. Hwang, "Hybrid Dust Collector for Removing Subway Tunnel Particle," pp. 797-802, Proceedings of the KSR Spring Conference, 2016.

J.-H. Park, D.-S. Park, "Evaluating the Methods for Removing PM10 in Subway Stations," pp. 144-149, Proceedings of the KSR Spring Conference, 2014.