H.T. obtained a Ph.D. from Tokyo Tech (Japan) in 1997 and is currently a professor at Gifu University (Japan). K.I. and T.S. are currently senior students at Gifu University (Japan). W.L. obtained a Ph.D. from Gifu University (Japan) in 2022 and is now an engineer at Kawamura Electric Inc. (Japan). M.S. obtained a Ph.D. from Tohoku University (Japan) in 1985 and is now a Professor Emeritus at Gifu University (Japan).