**Author details**

Hirotaka Ihara1,2\*, Makoto Takafuji2 and Yutaka Kuwahara2

1 National Institute of Technology, Okinawa College, Nago, Japan

2 Kumamoto University, Kumamoto, Japan

\*Address all correspondence to: ihara@kumamoto-u.ac.jp

© 2021 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
