1. Graduate
School of Engineering, Department of Applied Physics, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
2. Max Planck Institute
for Polymer Research, Ackermannweg
10, D-55128 Mainz, Germany
3. Faculty of
Science and Technology, Department of Applied Chemistry and Bioscience, Chitose Institute of Science and Technology, Bibi 65-758, Chitose, Hokkaido 066-8655, Japan