Sincethepublicationofthefirstedition,Ihavereceivedmanycommunicationsfromreadersallovertheworld.Itismygreatpleasuretothankthefollowingpeoplefortheircomments,correctionsandencouragements:Prof.JimAustin,Prof.FriedrichL.Bauer,Dr.HassanDaghighDr.DenizDeveci,Mr.RichFearn,Prof.MartinHellman,Prof.ZixinHou,Mr.WaseemHus-sain,Dr.GerardR.Maze,Dr.PaulMaguire,Dr.HelmutMeyn,Mr.RobertPargeter,Mr.Mok-KongShen,Dr.PeterShiu,Prof.JonathanP.Sorenson,andDr.DavidL.Stern.SpecialthanksmustbegiventoProf.MartinHellmanofStanfordUniversityforwritingthekindForewordtothiseditionandalsoforhishelpfuladviceandkindguidance,toDr.HansWSssner,Mr.AlfredHofmann,Mrs.IngeborgMayer,Mrs.UlrikeStricker,andMr.FrankHolzwarthofSpringer-Verlagfortheirkindhelpandencouragementsduringthepreparationofthisedition,andtoDr.RodneyColeman,Prof.