*Oktanius Richard Hermawan¹, Takahiro Hosono², Jun Yasumoto³, KE-HAN SONG⁴, Ryuichi Shinjo⁵, Takada Ryogo⁶ (1.Graduate School of Science and Technology, Kumamoto University, 2.Faculty of Advanced Science and Technology, Kumamoto University, 3.Department of Regional Agriculture Engineering, University of the Ryukyus, 4.Graduate School of Engineering and Science, University of the Ryukyus, 5.Research Institute for Humanity and Nature, 6.Center for Strategic Research Projects, University of the Ryukyus)

*KE-HAN SONG¹, Yuto Ito¹, Yumi Moromizato¹, Ryuichi Shinjo², Ryogo Takada³, Jun Yasumoto⁴ (1.Physics and Earth Sciences Course, Graduate School of Engineering and Science, University of the Ryukyus, Senbaru 1, Nishihara, Okinawa 903-0213, Japan, 2.Research Institute for Humanity and Nature, Motoyama 457-4, Kamigamo, Kita-ku, Kyoto 603-8047, Japan, 3.Center for Strategic Research Projects, University of the Ryukyus, Senbaru 1, Nishihara, Okinawa 903-0213, Japan, 4.Department of Regional Agricultural Engineering, Faculty of Agriculture, University of the Ryukyus, Senbaru 1, Nishihara, Okinawa 903-0213, Japan)