In this paper, we first briefly introduce the concepts of clickstream data and data warehouse, analyze twoexisting clickstream star schema click star schema and session star schema in webhouse, then induce a new mod-el transaction star model based on them, and expressed the method of bringing out the model. Comparing withthe two schemas mentioned above, its most apparent speciality is that it includes a series of meaningful page-view se-quence rather than a single click. Thus, on the one hand it improves the query performance of data, on the other handit is in favor of executing more deepen analysis data mining, and simplifies the process of data pretreatment. Atlast ,the paper verifies its' feasibility and validity using association rules based on the model.
无线组网技术当前主要有Sensor Network和Ad hoc Network两种。与传统的有线网络相比,无线网络同样使用类似于TCP/IP的分层协议进行通信。这样无线网络不仅继承了大部分有线网络的安全缺陷,而且由于使用无线信号传输数据,又使它具有了一些特有的安全问题。本文从信息安全学的角度,系统地综述了无线组网技术中的安全问题及对策,为这个领域的研究提供了清晰的问题结构。
