It is quite a challenge to select high quality Web pages(key resource pages)query-independently.

A new reduction method based on critical resources and primary resources is proposed.

Aiming at the problem,an job selection algorithm with critical resource constraints is presented,whose purpose is to take maximum profit under due-date limit.

Uncertainty arising from two way: first,the property characteristics in critical resources.

The mistake arrangment comes from unclearness of firm s critical resource.

A website categorization system based on key resource;

Research on key resources can be used to construct the website.

The growth mechanism and the disposition mechanism of key resources in enterprises;

,the power to get access to and use the key resources.

This paper carries on a thorough research on the access control of the key resource on the Windows OS,and put forward a kind of method of protecting the key resources of the system,which adopts the technique of Windows drivers and system call interception in kernel,implementing the strengthen access control of the key resources such as the file,register table and progress.

In order to take fine-grained and transparent access control for dynamic Web pages resource,this paper defines "fragment",presents an approach of fragment-level access control for Web pages resources based on data stream analysis,which analyses the relation between request and response fragments,and designs and realizes two kinds of arithmetic for fragment identify.