1. Department of Structural Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92037, USA
2. Department of Modern Mechanical Engineering and Waseda Institute for Advanced Study, Waseda University, 1-6-1 Nishi-Waseda, Shinjuku-ku, Tokyo 169-8050, Japan
3. Mechanical Engineering, Rice University–MS 321, 6100 Main Street, Houston, TX 77005, USA