随着网络数据量的日益增大从而导致计算复杂和时间复杂度高的问题,特征选择是降低高维数据计算复杂度的有效方法之一,本文提出一种面向入侵检测领域的两阶段特征选择方法,通过Relief F消除冗余特征和FCBF算法选择特征子集的结合方法,目...随着网络数据量的日益增大从而导致计算复杂和时间复杂度高的问题,特征选择是降低高维数据计算复杂度的有效方法之一,本文提出一种面向入侵检测领域的两阶段特征选择方法,通过Relief F消除冗余特征和FCBF算法选择特征子集的结合方法,目标是达到在不减少入侵检测效果的情况下通过降维减少时间复杂度。实验采用KDD CUP 99数据集,对数据的41维特征进行选择,采用支持向量机作为分类器,结果表明所提出的方法能够在保证分类准确率的情况下,减少至少20%计算时间。展开更多
A novel latent thermal initiator, ferricenium tetrafluoroborate salt (FcBF4), for cationic polymerization of epoxides is reported. The activities of FcBF4 for different epoxides, including bisphenol-A-type epoxy oligo...A novel latent thermal initiator, ferricenium tetrafluoroborate salt (FcBF4), for cationic polymerization of epoxides is reported. The activities of FcBF4 for different epoxides, including bisphenol-A-type epoxy oligomer E44, cycloaliphatic epoxy ERL4221, and glycidylether epoxy GGE, were evaluated by differential scanning calorimetry (DSC). The results showed a moderate thermal initiation activity for E44 and GGE at 78℃ and 108℃ respectively. When adding GGE to E44, the reaction was enhanced. The temperature of thermal degradation of the cured specimens for the system of E44/FcBF4, E44+10%GGE/FcBF4 and E44+10%ERL4221/FcBF4 is higher than 350℃.展开更多
文摘随着网络数据量的日益增大从而导致计算复杂和时间复杂度高的问题,特征选择是降低高维数据计算复杂度的有效方法之一,本文提出一种面向入侵检测领域的两阶段特征选择方法,通过Relief F消除冗余特征和FCBF算法选择特征子集的结合方法,目标是达到在不减少入侵检测效果的情况下通过降维减少时间复杂度。实验采用KDD CUP 99数据集,对数据的41维特征进行选择,采用支持向量机作为分类器,结果表明所提出的方法能够在保证分类准确率的情况下,减少至少20%计算时间。
文摘A novel latent thermal initiator, ferricenium tetrafluoroborate salt (FcBF4), for cationic polymerization of epoxides is reported. The activities of FcBF4 for different epoxides, including bisphenol-A-type epoxy oligomer E44, cycloaliphatic epoxy ERL4221, and glycidylether epoxy GGE, were evaluated by differential scanning calorimetry (DSC). The results showed a moderate thermal initiation activity for E44 and GGE at 78℃ and 108℃ respectively. When adding GGE to E44, the reaction was enhanced. The temperature of thermal degradation of the cured specimens for the system of E44/FcBF4, E44+10%GGE/FcBF4 and E44+10%ERL4221/FcBF4 is higher than 350℃.