1. Department of Electrical Engineering and Information Technology, University of Naples Federico II, 80125 Naples, Italy
2. University of Benevento Giustino Fortunato, 82100 Benevento, Italy
3. Department of Engineering, University of Naples Parthenope, 80143 Naples, Italy
4. Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, 80125 Naples, Italy