A highly accurate piezoelectric actuator driver IC for auto-focus in camera module of mobile phone. - Chanwoo Park; Sanghyun Cha; Yuenjoong Lee; Ohjo Kwon; Deukhee Park; Kyoungsoo Kwon; Jaeshin Lee (ISCAS, 2010)

AC/DC converter free LED driver for lightings. - Sanghyun Cha; Deukhee Park; Yuenjoong Lee; Changseok Lee; Joongho Choi; Jaeshin Lee; Hyobum Lee (ICCE, 2012)