1. Research Institute for Industrial Research, Aichi Institute of Technology, 1247 Yachikusa, Yakusa, Toyota 470-0392, Japan
2. Department of Electric Engineering, Aichi Institute of Technology, 1247 Yachikusa, Yakusa Toyota 470-0392, Japan
3. Research & Development Department, Hamamatsu Photonics KK, 314-5 Shimokanzo, Iwata, Shizuoka 438-0193, Japan