1. Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu, Kitakyushu 8080196, Japan
2. Laboratory for Organic Electronics, Division of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
3. Department of Computer Science and Electronics, Kyushu Institute of Technology, 80-4 Kawazu, Iizuka 820-8502, Japan