1. Assistant Professor, Dept. of Industrial and Management Systems Engineering, West Virginia Univ., Morgantown, WV.
2. Graduate Student, Dept. of Systems Design Engineering, Univ. of Waterloo, Waterloo, ON, Canada.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Waterloo, Waterloo, ON, Canada.
4. Professor, Dept. of Systems Design Engineering, Univ. of Waterloo, Waterloo, ON, Canada.