1. Director of Project Based Learning Laboratory (PBL Lab), Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305-4020, USA
2. School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
3. Graduate School of Economics, Osaka University, 1-7 Machikaneyama, Toyonaka, Osaka 560-0043, Japan