1. Institute of Sustainable Energy, Universiti Tenaga Nasional , Kajang , 43000 , Malaysia
2. School of Engineering and Technology, Sunway University, Bandar Sunway , Petaling Jaya , 47500 , Malaysia
3. School of Civil and Environmental Engineering, University of Technology Sydney , Ultimo , NSW 2007 , Australia
4. School of Electrical Engineering, Korea University , Seongbuk-Gu , Seoul , 136-701 , Republic of Korea