a technique for detecting malicious documents based on calculation of vector spaces

通过对恶意文档的攻击方式、组成结构和攻击代码的全面分析,提出了一种基于空间向量计算的检测方法,针对典型的变形手段提出了有针对性的改进.对119个文档进行了检测,结果表明,与传统检测软件相比,该算法对恶意文档检测在漏报率和误报率上均具备一定优势

Settlement and Metamorphosis of Actinula of Tubularia mesembryanthemum and Effect of Temperature and Salinity

研究了中胚花筒螅辐射幼体的附着和变态过程以及不同温、盐度对辐射幼体附着和变态的影响.结果表明幼体的附着分为暂时性附着及永久性附着两个阶段;幼体附着变态的适宜盐度范围为23~41;适宜温度范围为13~21℃;在较低温度下(9~17℃),幼体可逆性ATT附着时间延长,有利于幼体对附着基底的选择及幼体的扩散.The processes of settlement and metamorphosis of actinula of Tubularia mesembryanthemum and the effects of temperature and salinity on settlement and metamorphosis were investigated.The results showed that the settlement contained two successive processes: temporary settlement and permanent settlement.Acinula could conduct settlement and metamorphosis at the salinity range of 23~41 and the temperature range of 13~21℃,respectively.It woule take more time for actinula to settle at lower temperatures(9~17℃),which provided more opportunities for actinula to disperse and detect for a fitted substratum.国家自然科学基金(40276041)资