Yong Wook Kim, Yongwoo Cho, “System for Smart Library,” Korea Registered Patent, No. 10-2020632, September, 2019.

Youngkook Hong, Heonshik Shin, Sangwook Cho, Heejung Lee, Yongwoo Cho, Kyungtae Kang, “Apparatus for Transmitting and Receiving Device Management Messages in Broadband Wireless Network, and Method Thereof,” Korea Registered Patent, No. 10-1278282, June, 2013.

Yongwoo Cho, Kookjin Lee, Heonshik Shin, “Picture Quality Enhancement for Bi-directional Broadcasting Services using Real-time Feedback,” Korea Registered Patent, No. 10-1025483, March 2011.