1. Associate Professor, Dept. of Civil Engineering, National Univ. of Singapore, Singapore 119260.
2. Research Scholar, Dept. of Civil Engineering., National Univ. of Singapore, Singapore 119260.
3. Associate Professor, Dept. of Mathematics, National Univ. of Singapore, Singapore 119260.
4. Senior CAD/CAM Specialist, National Univ. of Singapore, Singapore 119260.