1. a Department of Aerospace Engineering, Tohoku University, Aoba 6-6-01, 980-8579 Sendai, Japan;, Email: eric@astro.mech.tohoku.ac.jp
2. b Department of Engineering for Innovation, University of Salento, Via Arnesano, 73100 Lecce, Italy
3. c Department of Aerospace Engineering, Tohoku University, Aoba 6-6-01, 980-8579 Sendai, Japan