Masakazu Soshi (Associate Professor, Hiroshima City University) Shoichi Hirose (Professor, University of Fukui) Hiroyuki Okazaki (Assistant Professor, Shinshu University) Masakazu Soshi (Associate Professor, Hiroshima City University) Shoichi Hirose (Professor, University of Fukui) Hiroyuki Okazaki (Assistant Professor, Shinshu University)