1. Professor, Dept. of Aerospace Engineering, San Diego State Univ., San Diego, CA 92182 (corresponding author).
2. Distinguished Professor and Fellow in the Engineering Mechanics Institute, Dept. of Aeronautics and Astronautics, Air Force Institute of Technology, Wright-Patterson AFB, OH 45433.
3. Ph.D. Candidate, Dept. of Aerospace Engineering, San Diego State Univ., San Diego, CA 92182; Ph.D. Candidate, Dept. of Structural Engineering, Univ. of California San Diego, La Jolla, CA 92093.