*Tsutomu Tanabe1, Atsushi Honma2, Teiji Sota3, Koji Mochida4, Paul Marek5
(1. Kumamoto University (Japan), 2. University of the Ryukyus (Japan), 3. Kyoto University (Japan), 4. Nagasaki Institute of Applied Science (Japan), 5. Virginia Tech (United States of America))