主題：Mobile computing ; Ubiquitous computing ; Wireless communication systems ; Computer Science. ; Algorithm Analysis and Problem Complexity. ; Computer Communication Networks. ; Information Systems Applications (incl.Internet) ; Performance and Reliability. ; Software Engineering. ; System Performance and Evaluation.
主題：Cable television|--United States. ; Cable television|--Government policy|--United States. ; Broadband communication sytems|--United States. ; Broadband communication systems|--Government policy|--United States.
主題：Wireless communication systems|Security measures. ; Engineering. ; Communications Engineering, Networks. ; Signal, Image and Speech Processing. ; Data Structures, Cryptology and Information Theory. ; Data Encryption.
主題：Data encryption (Computer science) ; Wireless communication systems|Security measures ; Computer Science. ; Coding and Information Theory. ; Computer Communication Networks. ; Computer Systems Organization and Communication Networks. ; Data Encryption. ; Data Structures, Cryptology and Information Theory. ; Systems and Data Security.
主題：Government communication systems. ; Public administration|Data processing. ; Semantic Web. ; Computer Science. ; Artificial Intelligence (incl. Robotics) ; Business Information Systems. ; Computer Appl. in Administrative Data Processing. ; Information Systems Applications (incl.Internet) ; Organization/Planning.
