The paper discusses the Web-based data warehousing and data mining technologies,analyzes the similarities and differences between the traditional data warehousing and data mining and the Web-based data warehousing and data mining.The architecture of the Web-based data warehousing is presented.The problems that should be solved are pointed out and some solutions are given.
The article focuses on the importance and the security problems of information flow in the e government system.Some typical models of information flow control are discussed.Finally,the article proposes a model of information flow control based on Petri nets.
