[1] Institute of Materials Research and Engineering, Level 3, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119 260, Singapore
[2] Liburdi Engineering Ltd., 400 Highway 6 North, Dundas, Ont. L9H 7K4, Canada
[3] Division of Materials Engineering, School of Applied Science, Nanyang Technological University, Singapore 639 798, Singapore