1. Computer Science Department, University Politehnica of Bucharest, 060042 Bucharest, Romania
2. Department of Information, Infrastructure and Sustainable Energy Engineering (DIIES), University Mediterranea of Reggio Calabria, 89124 Reggio Calabria, Italy
3. Department of Civil, Energy, Environmental and Material Engineering (DICEAM), University Mediterranea of Reggio Calabria, 89124 Reggio Calabria, Italy
4. Department of Computer Engineering, Modeling, Electronic and System Engineering, University of Calabria, 87036 Arcavacata, Italy
5. National Inter-University Consortium for Telecommunications (CNIT), 43124 Parma, Italy