1. Division
of Electrical Engineering and Computer Science, Kanazawa University, Kakuma-machi, 920-1192 Kanazawa, Japan
2. Research
and Development Group, Center for Technology Innovation - Materials, Hitachi, Ltd., 319-1292 Hitachi, Japan
3. EBARA Corporation, 144-8510 Tokyo, Japan
4. ACT-C, Japan Science and Technology Agency, Honcho 4-1-9, 332-0012 Kawaguchi, Japan