1. Department of Mechanical and Materials Engineering, University of Turku, Turku, Finland
2. Department of Electrical Engineering, Lappeenranta–Lahti University of Technology, Lappeenranta, Finland
3. Department of Mechanical Engineering, Lappeenranta–Lahti University of Technology, Lappeenranta, Finland
4. Materials and Mechanical Engineering Research Unit, University of Oulu, Oulu, Finland