Affiliations: Research and Development Center, Ricoh Co., Ltd.,
Shinei-cho16-1, Tsuzuki-ku, Yokohama-shi, Kanagawa, 224-0035, Japan. E-mail:
[email protected] | Department of Environmental Studies School of Frontier
Sciences The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656,
Japan