1. a Department of Civil and Environmental Engineering , University of Ulsan , Ulsan , Korea
2. b National Institute of Technology Karanataka–Surathkal , Mangalore , India
3. c Energy Conservation Research Department, Clean Energy System Research Center , Korea Institute of Energy Research , Daejeon , Korea
4. d Clean & Green Tech, Ungchon-myun , Ulju-gun , Ulsan , Korea