一、引言在当今社会，信息已成为一种至关重要的资源，为使各种信息能在“地球村”的任何地方、任何时间都能高速、准确的传递，为人们提供优质的服务，各国都在积极建设信息高速公路、多媒体通信网和综合业务数字网等等。与此同时，为适应信息服务范围不断拓宽的需要，智... I. INTRODUCTION In today’s society, information has become a crucial resource. In order to enable all kinds of information to be delivered at high speed and accuracy anywhere in the “global village” at any time and provide people with quality service, all countries Are actively building information superhighway, multimedia communication network and integrated business digital network and so on. At the same time, in order to meet the needs of expanding the scope of information services, intellectual ...