1. Ph.D. Senior Researcher, Korea Highway Corporation, 50-5, Sancheok, Dongtan, Hwaseongi, Gyeonggi, South Korea, 445-812 (corresponding author).
2. Associate Researcher, Korea Highway Corporation, 50-5, Sancheok, Dongtan, Hwaseongi, Gyeonggi, South Korea, 445-812.