1. Senior Research Engineer, Emerging Technologies, Advanced Engineering, Volvo Construction Equipment, 312 Volvo Way, Shippensburg, PA 17257 (corresponding author).
2. Gerald Tuma Presidential Professor, School of Electrical and Computer Engineering, 110 W. Boyd St., DEH 432, Univ. of Oklahoma, Norman, OK 73019.
3. Associate Dean for Research and Graduate Programs, College of Engineering, and David Ross Boyd Professor and Aaron Alexander Professor, School of Civil Engineering and Environmental Science, 202 W. Boyd St., Room CEC 107, Univ. of Oklahoma, Norman, OK 73019.
4. Graduate Student, School of Electrical and Computer Engineering, 110 W. Boyd St., DEH 432, Univ. of Oklahoma, Norman, OK 73019.