1. Soft I/O Interface Research Section; Electronics and Telecommunications Research Institute (ETRI); Daejeon 34129 Republic of Korea
2. Department of Electrical Engineering; Korea Advanced Institute of Science and Technology (KAIST); Daejeon 34141 Republic of Korea
3. Department of Flexible and Printable Electronics, Polymer Materials Fusion Research Center; Chonbuk National University; Jeonju 54896 Republic of Korea