1. Graduate Student, Dept. of Mechanical and Aerospace Engineering, California State Univ. Long Beach, 1250 N. Bellflower Blvd., Long Beach, CA 90840.
2. Assistant Professor, Dept. of Mechanical and Aerospace Engineering, California State Univ. Long Beach, 1250 N. Bellflower Blvd., Long Beach, CA 90840 (corresponding author).