[1] Nanyang Technol Univ, Interdisciplinary Grad Sch, 21 Nanyang Link, Singapore 637371, Singapore
[2] Nanyang Technol Univ, NEWRI, 1 Cleantech Loop,CleanTech One, Singapore 637141, Singapore
[3] Nanyang Technol Univ, Sch Civil & Environm Engn, EBiG, 50 Nanyang Ave, Singapore 639798, Singapore