1. Graduate School of Engineering and Science, University of the Ryukyus,Okinawa,Japan
2. Institute of Materials and Systems for Sustainability, Nagoya University,Nagoya,Japan
3. SASTRA Deemed University,Department of Electrical and Electronics Engineering,Thanjavur,India
4. Fuji Electric Co., Ltd.,Tokyo,Japan
5. University of the Ryukyus,Faculty of Engineering,Okinawa,Japan