1. Earth and Environmental Engineering Department, Earth Engineering Center, Columbia University, New York, NY 10027, USA
2. Department of Electrical and Electronics Engineering, School of Engineering, University of West Attica, Campus 2 Thivon 250, 122 44 Aigaleo, Greece
3. Department of Industrial Design and Production Engineering, School of Engineering, University of West Attica, Campus 2 Thivon 250, 122 44 Aigaleo, Greece