1. Associate Professor, Dept. of Engineering Innovation, Univ. of Lecce, Via per Arnesano, 73100 Lecce, Italy (corresponding author). E-mail: antonietta.aiello@unile.it
2. Ph.D. Student, Dept. Engineering Innovation, Univ. of Lecce, Via per Arnesano, 73100 Lecce, Italy. E-mail: marianovella.leone@unile.it
3. Full Professor, School of Engineering, Univ. of Sannio, Benevento, Italy. E-mail: pecce@unina.it