聚丙烯纤维网加强混凝土在交通工程中的应用研究

阐述了聚丙烯纤维网对应用在交通工程中混凝土性能的影响，并与钢纤维、钢筋网等材料进行了对比；简要介绍了聚丙烯纤维混凝土的施工方法以及若干国内外典型的应用实例。     

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.     

乡村振兴与“四好农村路”建设

首先从促进“产业兴旺”和“生活富裕”、促进“生态宜居”、促进“乡风文明”和“治理有效”等方面,论述了“四好农村路”在乡村振兴战略中的地位和作用;然后剖析了当前农村公路交通面临的不平衡不充分发展问题;最后坚持问题导向和需求导向,提出了服务支撑乡村振兴战略推进“四好农村路”建设的总体思路、主要任务方向和相关措施建议。