stored in a retrieval system or transmitted in any form or by any means without permission of the author. Alle rechten voorbehouden. Niets uit deze uitgave mag worden vermenigvuldigd, in enige vorm of op enige wijze, zonder voorafgaande schriftelijke toestemming van de auteur.
GRADUATION COMMITTEE:Chairman/secretary prof.dr.ir. J.N. Kok Supervisor dr.ir. H.G. Kerkhoff Members prof.dr.ir. G.J.M. Smit prof.dr.ir. A. Pras prof.dr. J. Figueras Pamies prof.dr.ir. S. Hamdioui prof.dr. J.L. Hurink dr. J. Bisschop My sincere thanks go to my wife, Jifeng Tang, for her countless efforts and time spent on taking care of family during my thesis writing. Without her help, I could not have made it.Also appreciation for my parents for their understanding when i was busy with my thesis and could not go back to visit them.I would like to show my gratitude particularly to my supervisor Hans Kerkhoff for his mentorship and support throughout my PhD work. Furthermore for his great patience and tremendous amount of time spent on reviewing my thesis. Also thanks to Prof. Gerard Smit for his reviewing of my thesis. I also would like to thank my colleagues at the University of