1. Faculty of Engineering, University of the Ryukyus, 1 Senbaru, Okinawa 903-0213, Japan
2. Graduate School of Information Science and Electrical Engineering, Kyushu University, Fukuoka 819-0395, Japan
3. Department of Environmental Science and Engineering, Kochi University of Technology, Kochi 782-8502, Japan
4. Department of Display, Hoseo University, Cheonan, Asan 31499, South Korea