Outdoor Operation of Structured Light in Mobile Phone. - Byeonghoon Park; Yongchan Keh; Donghi Lee; Yongkwan Kim; Sungsoon Kim; Kisuk Sung; Jungkee Lee (ICCV Workshops, 2017)

A family of two-generator non-Hopfian groups. - Donghi Lee; Makoto Sakuma (Int. J. Algebra Comput., 2017)

Construction of non-Hopfian groups as direct limits of relatively hyperbolic groups. - Jan Kim; Donghi Lee (Int. J. Algebra Comput., 2022)