Óÿ '#º t°ÿý&wT¥ GBx š ‰"H¿ c Ü$ÁxÏðæôokU7GUýwG€_¦,' Œ±sù3GÑ =wÁ˜Ý"B 91S ÜÀ aÛ »?'zðÀGQïíÌÇc ž,BY E˜úÑ ðî3Mˆç²YÍ!ÞMÍSbŒûßùý&6ƒ jϹ® ° 2÷×°¥¡ØÒŸð›V^J³ýzuˆŒâðÎÑñP` ÷U ?gÇq6("®ÛÂB m´G¯ „«ŒÖp Äq fÐ'¡ ßÓÑRw‹_" ïšpÿ°t øŒ¯™"Êo`Àû¸{SnJ þ¯ ÑÓQùŸE?2k iZòF žzIntegrated eServices, Amsterdam, 2nd Jul 09 iv ACKNOWLEDGMENTS This thesis would have not been possible without the support of many people Firstly and mostly, I would like to thank the Egyptian Ministry of Higher Education, and my home university, Ain Shams University, in Egypt, who offered me the opportunity to pursue my PhD studies in the United Kingdom by granting me aHOME @> @ A e B X g @> @ { l A e B X g @> @ P M i Ђ߂ @ j P M o g n @ s a @1 12 @ R r t ^ @AB ^ g @157cm ̏d @44kg T C Y @86/58/ C @225cm @ @ s A C A d b D ȐH ו @ Ԃ ԁA u D� Speciale Tekens Typen Op De Mac De Toetscombinaties Gp miami