1. Department of Applied Physics and Electronics; Umeå University; SE-90187 Umeå Sweden
2. Department of Applied Physics and Electronics; Industrial Doctoral School; Umeå University; SE-90187 Umeå Sweden
3. Department of Forest Technology; Swedish University of Agricultural Sciences; SE-90183 Umeå Sweden
4. Department of Transmission and Hybrid Systems; IAV Automotive Engineering; DE-10587 Berlin Germany
5. Department of Engineering Cybernetics; Norwegian University of Science and Technology; NO-7491 Trondheim Norway