1. Dept. of Geological Engineering, Missouri Univ. of Science and Technology, 129 McNutt Hall, 1400 N. Bishop Ave., Rolla, MO 65409 (corresponding author).
2. Professor of Geological Engineering, Dept. of Geological Engineering, Missouri Univ. of Science and Technology, 129 McNutt Hall, 1400 N. Bishop Ave., Rolla, MO 65409.
3. Professor of Electrical Engineering, Dept. of Computer and Electrical Engineering, Missouri Univ. of Science and Technology, 305 McNutt Hall, 1400 N. Bishop Ave., Rolla, MO 65409.