alert rate

Too high false alert rate and the presence of large number of redundant information, result in overburdened system administrators. So they can not fully understand the security situation of the network to make appropriate response in time.

误警率过高，大量冗余信息的存在，导致系统管理员不堪重负，并使他们不能充分的了解网络的安全状况以便及时做出恰当的反应。

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However those faults such as high fault alert rate, lack of inter-operation ability, lack of overall profile and alert correlation, have held back the development and application of IDS.

但目前入侵检测系统存在的高误报率、缺乏互操作能力、缺乏全局视图和警报关联等问题，已严重限制了入侵检测系统的发展和应用。

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In our model, special function module for intrusion detection is designed. It combines the the misuse intrusion detection and anomaly intrusion detection techniques, and lowers the the false alert rate and the missed alert rate of intrusion detection.

模型还设计了专门的混合式入侵检测模块，结合误用入侵检测和异常入侵检测技术，降低了入侵检测的误警率和漏警率。

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Meanwhile, if we take syslog as a source for IDS, we can increase the efficiency of IDS and decrease IDS's alert error rate This article mainly talks about the building and realization of the syslog data acquisition engine in the network.

同时，如果将syslog作为IDS的数据源之一，可以提高IDS的效率及降低误报率。本文着重介绍syslog数据采集引擎在网络中的架构与实现。

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Aiming at the problem of traditional intrusion system, such as high false alert rate, alert torrent, alert isolation, a data fusion model in distributed intrusion detection is put forward.

针对传统的入侵检测系统存在的误警率高、存在告警洪流、告警孤立等缺点，引入了数据融合方法，提出了一个分布式入侵检测中的数据融合模型。

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We can make the alert rate of the three types of asymmetrical range charts reach 0.27%, which is much lower than the one of range chart of National Standard.

使用这三种非对称极差控制图可以使真实报警率达到0.27%，远小于现有的国家标准极差控制图的真实报警率。

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A three-level B-P neural network that can alert learning rate and momentum coefficient automatically was taken to do it. There were 6 nods in input layer, 8 in hide layer and 2 in output layer.

改进后的B-P网络为3层网络，输入层6个结点，隐形层8个结点，输出层2个结点，并且可以在线调整学习速率η。

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Finally, to verify the validity of the model, I used historical data back to the early warning model for sub-test, binary logistic model to calculate the overall accuracy rate and false alert rate.

最后，为了验证模型的有效性，笔者利用历史数据对预警模型进行回判测试，计算出二元逻辑斯蒂模型的总体预警准确率和误判率。

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The false alert rate, average run length of the control charts' eight criteria are studied and the application of the eight criteria is illustrated.

由此，对控制图的八个判异准则的虚报率、平均链长等进行了分析研究，并说明了八个判异准则在实际中的应用。

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