1. Ph.D. Research Fellow, Dept. of Engineering Sciences, Univ. of Agder, Jon Lilletuns vei 9, Grimstad 4879, Norway (corresponding author). ORCID: .
2. Associate Professor, Dept. of Engineering Sciences, Univ. of Agder, Jon Lilletuns vei 9, Grimstad 4879, Norway. ORCID: .