1. Research Scientist, Institute for Combustion Science and Environmental Technology, Western Kentucky Univ., 2413 Nashville Rd., Bowling Green, KY 42103.
2. Graduate Research Assistant, Dept. of Civil and Environmental Engineering and Geodetic Science, The Ohio State Univ., 470 Hitchcock Hall, 2070 Neil Ave., Columbus, OH 43210.
3. Research Scientist, Dept. of Civil and Environmental Engineering and Geodetic Science, The Ohio State Univ., 470 Hitchcock Hall, 2070 Neil Ave., Columbus, OH 43210.
4. Professor, Dept. of Civil and Environmental Engineering and Geodetic Science, The Ohio State Univ., 470 Hitchcock Hall, 2070 Neil Ave., Columbus, OH 43210.