1. Graduate Research Assistant, Dept. of Computer Science, Michigan Technological Univ., 1400 Townsend Dr., Houghton, MI 49931.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Michigan Technological Univ., 1400 Townsend Dr., Houghton, MI 49931 (corresponding author).
3. Associate Professor, Dept. of Computer Science, Michigan Technological Univ., 1400 Townsend Dr., Houghton, MI 49931.
4. Associate Professor, Dept. of Civil and Environmental Engineering, Michigan Technological Univ., 1400 Townsend Dr., Houghton, MI 49931.