1. Ph.D. Candidate, School of Civil and Environmental Engineering, Yonsei Univ., 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.
2. Professor, School of Civil and Environmental Engineering, Yonsei Univ., 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea (corresponding author).
3. Ph.D. Student, Dept. of Computer Science, Yonsei Univ., 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.
4. Professor, Dept. of Computer Science, Yonsei Univ., 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea.