Affiliation: | 1. Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan;2. Department of Oral Biochemistry, Collage of Dentistry, Chosun University, Gwangju 501-759, Republic of Korea;3. Institute of Carbon Science and Technology, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan |