1. Department of Electrical and Computer Engineering, Johns Hopkins University, 105 Barton Hall, 3400 N. Charles St., Baltimore, MD 21218, USA
2. AMOLED Group, Samsung SDI, 428-5, Gongsedong, Yongin, 446-577, S. Korea
3. Network Examination Team, Korean Intellectual Property Office, 920 Dunsandong, Seogu, Daejeon, 302-701, S. Korea