1. Assoc. Res. Ofcr., Innovation Ctr., National Research Council of Canada, 3250 East Mall, Vancouver, B.C., Canada V6T 1W5.
2. Prof., Dept. of Mechanics, Jilin Univ. of Technology, Changchun 130022, China.
3. PhD Student, Innovation Ctr., National Research Council of Canada, 3250 East Mall, Vancouver, B.C., Canada.