1. Associate Professor, Dept. of Civil and Environmental Engineering,
Pusan National Univ., Busan 609735,
South Korea.
2. Manager, Road Planning and Management Division, Busan Metropolitan City, Busan 612735,
South Korea.
3. Postdoctoral Researcher, Dept. of Civil and Environmental Engineering,
Pusan National Univ., Busan 609735,
South Korea (corresponding author).