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Anomaly traffic detection of database network based on flow statistical features

Frontiers of Electrical and Electronic Engineering in China 2010年第1期5卷 85-90页

作者： Xinliang WANG Fang LIU Luying CHEN Zhenming LEI School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

The traditional intrusion detection system has the problem of high false positive rate and false negative *** paper deeply analyzes the differences of statistical features between single-flow and multi-flow on the database network,and presents a group of features that are easy to acquire and can be used to detect the anomaly in database network *** applying this group of features in Fisher algorithm for anomaly detection,the false positive rate and false negative rate are dramatically ***,the model made by using the group of features has the advantages of low algorithm complexity,good detection result and strong generalization *** results show that there is higher accuracy when using the features of single-flow and multiflow to construct the anomaly detection model than only using single-flow features.

关键词： anomaly detection flow statistical feature Fisher statistical package for social sciences(SPSS)

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Spur Gear Tooth Pitting Propagation Assessment Using Model-based Analysis

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Chinese Journal of Mechanical Engineering 2017年第6期30卷 1369-1382页

作者： Xi-Hui Liang Zhi-Liang Liu Jun Pan Ming Jian Zuo Department of Mechanical Engineering University of Alberta School of Mechatronics Engineering University of Electronic Science and Technology Key Laboratory of Reliability Technology for Mechanical and Electrical Product of Zhejiang Province Zhejiang Sci-Tech University

Tooth pitting is a common failure mode of a gearbox. Many researchers investigated dynamic properties of a gearbox with localized pitting damage on a single gear tooth. The dynamic properties of a gearbox with pitting distributed over multiple teeth have rarely been investi- gated. In this paper, gear tooth pitting propagation to neighboring teeth is modeled and investigated for a pair of spur gears. Tooth pitting propagation effect on time-vary- ing mesh stiffness, gearbox dynamics and vibration char- acteristics is studied and then fault symptoms are revealed. In addition, the influence of gear mesh damping and environmental noise on gearbox vibration properties is investigated. In the end, 114 statistical features are tested to estimate tooth pitting growth. statistical features that are insensitive to gear mesh damping and environmental noise are recommended.

关键词： Mesh stiffness Mesh damping Geardynamics Vibration statistical feature Dynamicsimulation

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RELATIONSHIP BETWEEN THE 30 TO 60 DAY OSCILLATION OF ATMOSPHERIC HEAT SOURCE AND THE DROUGHT AND FLOOD EVENTS IN JUNE IN THE SOUTH OF CHINA

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Journal of Tropical Meteorology 2012年第3期18卷 332-340页

作者：高斯简茂球乔云亭 Centre for Monsoon and Environment Research Department of Atmospheric SciencesSchool of Environmental Science and EngineeringSun Yat-sen University

Based on the NCEP/NCAR reanalysis data and the observed precipitation data in the south of China from 1958 to 2000,the impact of 30 to 60 day oscillation of atmospheric heat sources on the drought and flood events in June in the south of China is *** the flood(drought) events,there exists an anomalous low-frequency anticyclone(cyclone) at the low level of the troposphere over the South China Sea and the northwestern Pacific,accompanied with anomalous low-frequency heat sinks(heat sources),while there exists an anomalous low-frequency cyclone(anticyclone) with anomalous heat sources(sinks) over the area from the south of China to the south of *** average,the phase evolution of the low-frequency in drought events is 7 to 11 days ahead of that in flood events in May to June in the south of *** flood events,low-frequency heat sources and cyclones are propagated northward from the southern South China Sea,northwestward from the warm pool of the western Pacific and westward from the northwestern Pacific around 140°E,which have very important impact on the abundant rainfall in June in the south of ***,in drought events,the northward propagations of the low-frequency heat sources and cyclones from the South China Sea and its vicinity are rather late compared with those in flood events,and there is no obvious westward propagation of the heat sources from the northwestern *** timing of the low-frequency heat source propagation has remarkable impact on the June rainfall in the south of China.

关键词： climatology statistical feature atmospheric heat source 30-60 day oscillation flood and drought the south of China

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