1. Institute of Industrial Science, the University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505 Japan
2. Department of Materials Engineering, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan
3. Idemitsu Kosan, Co., Ltd., 1280 Kamiizumi, Sodegaura-shi, Chiba, 299-0293 Japan