A Study on the Twofish Security Processor Design Using USB Interface Device. - Seon-Keun Lee; Sun-Yeob Kim; Yoo-Chan Ra (ICHIT (2), 2011)

A Study on Visitors Tracking Method Using Wireless Communication. - Shin-Hyeong Choi; Sun-Yeob Kim; Yoo-Chan Ra (ICISA, 2013)