1. Institute of Mechanics, Materials and Civil Engineering (iMMC); Université catholique de Louvain; Bâtiment Euler, Avenue Georges Lemaître 4; 1348 Louvain-la-Neuve; Belgium
2. LTAS; Université de Liège; Liège; Belgium
3. Department of Electrical Engineering and Computer Science, Montefiore Institute B28; Université de Liège; Grande Traverse 10; 4000 Liège; Belgium