1. School of Computing, Engineering and Mathematics;
2. Institute for Infrastructure Engineering, University of Western Sydney, Locked Bag 1797, Penrith, New South Wales 2751, Australia e-mail:
3. School of Computing, Engineering and Mathematics, University of Western Sydney, Locked Bag 1797, Penrith, New South Wales 2751, Australia
4. Institute for Infrastructure Engineering, University of Western Sydney, Locked Bag 1797, Penrith, New South Wales 2751, Australia