In makes an applied multi-level relation model to be basement of security database for following the BLP model.
为了适应BLP 模型，采用一种实用的多级 关系 模型作为安全数据库的基础，这是原有 关系 模型的扩展。
It is proved that the extended BLP model can enhance both the confidentiality and usability of the database system.
经过证明，扩展后的BLP模型不仅增强了数据库系统的机密性而且增强了可用性。
The mechanism of buffer overflow from the point of view of security operating system is analyzed, buffer overflow with BLP model is formalized.
首先分析了操作系统中客体的类型，将客体分为静态客体和动态客体，然后总结了安全操作系统中对客体的处理存在的问题。
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