Current-sensing technique for current-mode DC-DC buck converter with offset-voltage compensation. - Jungeui Park; Jungsoo Choi; Wooju Jeong; Sangduk Yu; Kichang Jang; Youngchan Choi; Joongho Choi (APCCAS, 2008)

A piezoelectric actuator driver circuit for automatic focusing of mobile phone cameras. - Sangduk Yu; Kichang Jang; Sanghyun Cha; Yeonjung Lee; Ohjo Kwon; Kyoungsoo Kwon; Joongho Choi (ISCAS, 2008)