多媒体内容检索是互联网应用的一种重要方面，如何准确的描述多媒体信息特别是图像信息是多媒体信息检索必须要解决的问题。本文提出了一种基于MPEG-7标准的图像内容的描述方案，可以用于多媒体内容检索中的图像检索。本文首先介绍了MPEG-7标准以及MPEG-7标准中的多媒体描述方案；然后叙述基于MPEG-7的图像描述方案的技术与相关特征；最后给出了一个具体的基于MPEG-7的图像描述方案的实际例子。

根据模糊数学的理论建立了一种信息系统开发的动态风险估测算法以及该算法在信息系统开发的风险估测中的应用。

The query conditions are imprecise or uncertainty in multimedia information retrieval. So it is impossible to get completely information by using traditional retrieval method and new techniques must be developed in order to get the best similar retrieval results under the inaccurate or incomplete retrieval conditions given. In this paper, a fuzzy semantic distance model and a concept of fuzzy similarity are first proposed and fuzzy query processing in fuzzy space is described; then, the algorithm of information retrieval in multimedia databases based on fuzzy similarity is provided; finally, an example is used for explanation the algorithm.

MPEG27称为/多媒体内容描述接口0，主要由描述器，描述方案和描述定义语言组成。MPEG27与数字图书馆之间具有许多协同性，MPEG27中定义的多媒体内容描述将使数字图书馆的信息检索具有更大的效率，也可以较好地解决目前不同数字图书馆中的互操作性和没有统一标准的问题。

Government procurement, known as the "Under Sunshine" system in China, has saved millions of US dollars of government expenditure. China will gradually expand the scope and scale of government purchase after the country's first Government Procurement Law took effect on January 1, 2003. Compared to the developed countries, the technology applied in government procurement is obsolete. Government electronic procurement auctions are irregular, and the government electronic procurement auction systems are not completely implemented. In this paper, we analyze the current situation of government procurement in China, and support that establishing government procurement electronic auction system is the best way to solve problems such as unfairness, collusion, inequality and inefficiency. Then, we give a detailed discussion about the framework of government procurement electronic auction system and the features of each subsystems and modules. Finally an actual application of this system is given, and an auction algorithm is also developed. We also provide directions for further studies about government procurement and the application of electronic commerce in this field.