1. Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of Delaware, Newark, DE 19716.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Delaware, Newark, DE 19716 (corresponding author).
3. Graduate Student, Dept. of Electrical and Computer Engineering, Univ. of Delaware, Newark, DE 19716.
4. Institute of Electrical Engineering, Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
5. Professor, Dept. of Electrical and Computer Engineering, Univ. of Delaware, Newark, DE 19716.