1. Professor, Dept. of Mathematical Sciences and Centre for Ships and Ocean Structures (CeSOS), Norwegian Univ. of Science and Technology, NO-7491 Trondheim, Norway (corresponding author).
2. Senior Research Engineer, Marintek, NO-7491 Trondheim, Norway.
3. Postdoctoral Research Associate, Centre for Ships and Ocean Structures, Norwegian Univ. of Science and Technology, NO-7491 Trondheim, Norway.