1. NIIGATA UNIVERSITY, Graduate School of Science and Technology(8050, Ikarashi Nino-cho, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan)
2. NIIGATA UNIVERSITY, Faculty of Engineering(8050, Ikarashi Nino-cho, Nishi-ku, Niigata-shi, Niigata 950-2181, Japan)