1. Division of Materials Science & Engineering and the Research Institute of Industrial Science; Hanyang University; Seoul 133-791 South Korea
2. Departments of Aerospace & Mechanical Engineering and Materials Science; University of Southern California; Los Angeles CA 90089-1453 USA
3. Departments of Materials Science and Engineering and Energy Systems Research; Ajou University; Suwon 443-749 South Korea
4. Department of Materials Engineering; Indian Institute of Science; Bangalore 560012 India
5. Materials Research Group, Faculty of Engineering and the Environment; University of Southampton; Southampton SO17 1BJ UK