Ultrasonics
Mami Matsukawa, Pak-Kon Choi, Kentaro Nakamura, Hirotsugu Ogi, Hideyuki Hasegawa, Mami (Doshisha University (Japan)) Matsukawa, Pak-Kon (Meiji University (Japan)) Choi, Kentaro (Tokyo Institute of Technology (Japan)) Nakamura, (Japan)) Ogi, Hirotsugu (Osaka University, Hideyuki (University of Toyama (Japan)) Hasegawa