并在此基础上提出了基于栈结构的支持度计算算法，该算法仅对数据库进行一次扫描，即可实现候选序列的计数操作。

Then it presents a support computing algorithm based on stack structure, which can count the candidate sequences by scanning the database only once.

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文章针对满足支持度要求的系统调用短序列，给出了特征模式的概念，并以此为基础提出了基于改进的隐马尔科夫方法(IHMM)。

In this model, the authors defined the short sequence of system calls as a character pattern if this sequence satisfied the certain support degree, and propose an improved HMM (IHMM) on this basis.

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