1. University of Westminster 115 New Cavendish Street,London,UK
2. Fraunhofer Institute for Material and Logistics IML Joseph-von-Fraunhofer-Str. 2-4,Department Enterprise Logistics,Dortmund,GERMANY
3. Institute of Dynamics and Vibration Research, Leibniz University Hannover An der Universität 1,Garbsen,GERMANY