*Kei Sato¹, Davin H.E. Setiamarga², Hiroshi Yonemitsu², Keita Higuchi³, Yasunori Iwahashi³, Kiyohito Nagai³ (1.Faculty of Education and Integrated Arts and Sciences, Waseda University, 2.National Institute of Technology, Wakayama College, 3.MIKIMOTO Pearl REsearch Laboratory)