1. Deputy Director, Construction Technology Examination Division, Korean Intellectual Property Office, Government Complex Daejeon Building 4, 920, Dunsan-dong, Seo-gu, Daejon City, South Korea. E-mail: moorakson@empal.com
2. Emeritus Professor, Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, 205 N. Mathews Ave., Urbana, IL 61801. E-mail: ecording@uiuc.edu