A NOVEL METHOD FOR NETWORK WORM DETECTION BASED ON WAVELET PACKET ANALYSIS

Objective To detect unknown network worm at its early propagation stage. Methods On the basis of characteristics of network worm attack, the concept of failed connection flow （FCT） was defined. Based on wavelet packet analysis of FCT time series, this method computed the energy associated with each wavelet packet of FCT time series, transformed the FCT time series into a series of energy distribution vector on frequency domain, then a trained K-nearest neighbor （KNN） classifier was applied to identify the worm. Results The experiment showed that the method could identify network worm when the worm started to scan. Compared to theoretic value, the identification error ratio was 5.69%. Conclusion The method can detect unknown network worm at its early propagation stage effectively.     

数字监控智能管理系统在公路交通领域中的应用

介绍了数字监控智能管理系统通过采用计算机、通讯、视频监控、信息处理等技术，在公路交通运输领域中的应用。     

基于计算机数值模拟技术确定围岩岩体力学参数的探讨

针对目前岩石力学处理工程问题的缺陷，探讨如何将前沿的计算技术与传统的力学实验相结合，以确定隧道工程中的围岩岩体力学参数，并提出了一些建议和方法。     

天津港水工设施档案动态管理系统

天津港利用计算机技术建立了水工设施档案动态管理系统，提高了管理水平，为将来建立港口设施档案数字图书馆奠定了基础。本文介绍了“天津港水工设施档案动态管理系统”的基本功能及其实现方法。     

计算机技术在三表检测中的应用

铁路各站段计量部门每年需耗费大量的时问和人力对各种型号的万用表进行检则。在按传统方法的检定过程中这一系列工作都由人工完成，人为误差在所难免，且存在检定程序不规范的问题(不按国家检定规程操作)，使被检表的可靠性降低，并且检定速度慢、工作量大、检测效率低下。把计算机技术应用于万用表的检测工作是解决这个问题的最好途径。     

Binary Image Watermarking Algorithm Using Matrix of Complexity Index

A new watermarking algorithm of binary image is proposed.The complexity index of pixels is presented to reflect the change degree of pixels and to evaluate the modifiable degree of pixels.Firstly, in a small image block, the complexity index of"jumping-change"is calculated in vertical and horizontal direction.Secondly, the matrix of the complexity index is calculated by integrating the complexity index of pixels in two directions.Finally, the matrix of the complexity index is used to embed the watermark in binary images.Experimental results show that the proposed algorithm has a good performance.     

利用计算机技术建立低频节距内平衡新模式

电缆低频四芯组节距内平衡，具有大量数据运算的特点。人工操作在现场不可能进行全面的计算，也就难以得到最佳交叉方案。计算机技术的引入解决了这个问题。不仅如此，测试点相对时间的剩余又引发了新施工模式的建立。     

智能型客车空调控制柜的研制

智能客车空调控制柜采用可编程控制代替了传统的继电器逻辑控制，具有故障诊断及预报警功能，提高了功能强度，降低了维修量，而且增加了通讯联网功能，便于实现车辆级、列车级乃至更大范围的全数字通信及智能化。