1. Ph.D. Student, Dept. of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0150 (corresponding author).
2. Research Engineer, Dept. of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0150.
3. Regents Professor, Dept. of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0150.
4. Graduate Student, ISAE-Supaero, 10 Ave. Edouard Belin, 31400 Toulouse, France.