Todd Simmermacher, Sandia National Laboratories, Albuquerque, USA. Scott Cogan, CNRS, University of Franche-Comte, Besançon, France. Babak Moaveni, Department of Civil and Envt. Eng., Tufts University, Medford, USA. Costas Papadimitriou, Department of Mech. & Industrial Eng., University of Thessaly, Volos, Greece.