1. Faculty of Civil Engineering, Universiti Teknologi Malaysia, UTM Skudai, Johor Bahru 81310, Malaysia
2. Department of Civil Engineering, Faculty of Engineering, Universitas Ibn Khaldun, Jalan Sholeh Iskandar, Kedung Badak, Bogor 16162, Indonesia
3. Biosystems and Agricultural Engineering, University of Kentucky, Lexington, Kentucky 40506, United States