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Vol. 10, No. 4 pp. 420-430 (in Korean).Park, J. S., Kim, T. H., Yoon, S. H. and Bae,
G. O. (2007). “Study on characteristics of subway user services using IPA analysis.”
Proceedings of Korean Society for Railway, Vol. 10, No. 4 pp. 420-430 (in Korean).