Affiliation: | Faculty of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga, 525-8577 Japan,;Graduate School of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga, 525-8577 Japan;and Research and Development Center, Koyo Seiko Co. Ltd, 24-1 Kokubuhiganjo-cho, Kashiwara, Osaka, 582–8588 Japan |