1. School of Mechanical Engineering; Konkuk University; Seoul 143-701 Republic of Korea
2. Flexible Display Roll-to-Roll Research Center; Konkuk University; Seoul 143-701 Republic of Korea
3. Department of Mechanical Design and Production Engineering; Konkuk University; Seoul 143-701 Republic of Korea
4. Sensor System Research Center; Korea Institute of Science and Technology; Seoul 136-791 Republic of Korea