Namkung, O., Shin Y., & Ahyun, K., (2018), Universal Design Project for Seoul Subway: Development of a Subway Transfer Map for the

                         Mobility Handicapped, Routes/Roads Magazine, No. 378 (ongoing).

 Namkung, O. & Chang, J. S. (2017). Examining Users’ Opinion on Statistical Yearbook of Railroad: Using Focus Group Interviews of 2007

                         and 2017. Journal of Transport Research. 24(3), 75-86.

UNIVERSAL DESIGN FOR ALL INCLUDING THE MOBILITY HANDICAPPED