The presence of errors may result in a false anomaly or a false trend, which influence the effect of geological interpretation and even cause serious mistakes.
误差的存在，有可能造成假的异常或假的趋势，影响地质解释的效果，甚至会出现严重的错误。
Although the filtering method in frequency domain can solve the time variant filtering problem based on Fourier transform, the method may appear a false anomaly in conjunct part between Windows.
频率域滤波方法虽然可解决时变滤波问题，但这种方法是基于傅里叶变换，在窗口与窗口之间的接合部位会出现假异常。
For reducing the false alarm, we adopt hierarchical alert classifier which combined misuse intrusion detection and anomaly intrusion detection.
并且采取结合了不当行为与异常行为侦测的阶层式警报分类器来降低假警报。
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