1. Ph.D. Student, Dept. of Engineering, Roma Tre Univ., via Vito Volterra 62, Rome 00146, Italy (corresponding author).
2. Postdoctoral Researcher, Istituto per le Applicazioni del Calcolo CNR, via dei Taurini 19, Rome 00185, Italy.
3. Full Professor, Dept. of Engineering, Roma Tre Univ., via Vito Volterra 62, Rome 00146, Italy.
4. Associate Professor, Dept. of Engineering, Roma Tre Univ., via Vito Volterra 62, Rome 00146, Italy.