Affiliation: | a SRAM & Design Group, Foundry Business Team, System LSI Division, Samsung Electronics Co. Ltd., Nongseo-Dong, Giheung-Gu, Yongin-City, Gyeonggi-Do, 446-711, Republic of Korea b Display and Nanosystem Laboratory, College of Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea c School of Electrical Engineering, College of Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea |