剪枝

This thesis discusses firstly the IGMP, describes the specification of the protocol and explains the differences between the three different versions of protocol. Then the RPF rule used by the router to forward multicast packets and the multicast forwarding tree are discussed. The process of building SPT and RPT is also illustrated. In this thesis, we also discuss the mechanism of Flooding and Pruning in Dense-Mode multicast routing protocol and the process of switch from RPT to SPT in Sparse-Mode routing protocol.

本论文讨论了实现IP组播的IGMP协议，对IGMP协议的协议规范进行了描述，并对IGMP三个版本的不同点作了详细说明；讨论了进行组播数据包进行转发的RPF基本原理、组播转发树的类型，并对SPT树和RPT树的建立过程进行了探讨；并分别对密集模式组播路由协议的扩散和剪枝机制、稀疏模式组播路由协议中的RPT树到SPT树的切换过程进行了详细的探讨。

A fine-grain ed inference control model was proposed and its implementation mechanism of XML document was given.

提出了一种细粒度的XML推理控制模型及实现机制，解决了强制访问控制所不能解决的敏感信息推理问题；改进了算法，可快速获得解决敏感信息泄露的最佳方案；引入剪枝策略，实现了安全信息最大化发布。

The corresponding color weighted diagraph was setup in dependence on the inference relation of the security holes in the intruded machine. With the vulnerability-log relation matrix, we searched different forensic information source and got the corresponding support value which could help to prune the false relation between the nodes and get the remote suspicious host. Then analyzing the suspicious host in the same way.

以漏洞间推理关系为前提，从受害主机入手，构造有色加权有向图，在多日志中查找漏洞被利用的解释信息，并由查找结果对漏洞链动态剪枝，得到主机漏洞攻击链和攻击该受害主机的嫌疑主机，对嫌疑主机迭代分析，推理出网络漏洞攻击链。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。