MOTOROLA GP88s手持台的选呼与组呼功能的实现

介绍了如何利用GP88s手持台的二次开发接口和控制协议,实现选呼、组呼、全呼功能,并通过按键编程方式写入手持台的本机号、分组号.     

一种基于程序行为模糊模式匹配的病毒检测方法

根据典型病毒的行为特征,提取病毒程序的系统API调用序列,用来分类量化病毒的程序行为。模糊分类后建立病毒行为特征库,对可疑程序进行模糊模式匹配。模拟中选取了3种典型计算机病毒样本,在不同阈值下对20个程序进行检测,结果表明,有效识别率可达90％。     

Correlation between echolocation calls and morphological features among three kinds of bats

The correlation between echolocation sound and morphological features of 18 species of bats, which are subordinated to 3 families including rhinolophidae, hipposideridae and vespertilionidae is studied. Pearson's correlation and regression analysis are adopted to analyze the correlations between noseleaf width (NW) and forearm length (FAL), NW and dominant frequency (DF), FAL and DF. The results show a positive correlation between NW and FAL and a negative correlation between NW and DF in Rhinolophidae. In each family, there is a negative correlation between FAL and DF. Some species have a higher or lower frequency than predicted one according to their body size. There are significant differences of the regression equation of FAL and DF among the three families. For the bats with the same body size, the order in frequency is: hipposiderid bats＞ rhinolophid bats＞ vespertilionid bats. The mechanism of interrelationship between FAL and DF of bats, the reason why these deviations occur in correlativity of the three families and the mechanism of the interaction between morphological, physiological and ecological characteristics are discussed.     

n组元网络随机连接特性研究

介绍了以ＲＡＭ实现的人工神经元和网络，着重分析了以随机方式连接的网络形态及其动态特性。概率分析结果表明，其动态特性可以预测，从而为网络自适应行为提供了一种测试手段。     

基于支持向量机的异常检测

提出一种使用支持向量机(SVM)进行计算机系统实时异常检测的方法，内容涉及到一种对支持向量机方法的改进算法、对数据预处理的方法及SVM核函数的选取．试验结果表明采用这一算法进行入侵检测具有准确率高、计算简单、占用的存储空间小等优点．     

毛腿鼠耳蝠回声定位声波的分析

毛腿鼠耳幅(Myotis fimbriatus)为中国特有编幅、在飞行及悬挂状态下发出的回声定位叫声为调频声．叫声主要包括2个谐波，其中第1谐波较强，飞行时第1谐波调频范围为39—93kHz，第2谐波调频范围为70—122kHz；叫声的持续时间10．6ms．结合回声定位叫声的声波特点分析，推断毛腿鼠耳幅多生活于阴暗潮湿、通风良好的山洞中，飞行速度轻侵，灵活性较差；多在树林的边缘或上空、农田、草地或水面上等不太复杂的近距离环境中捕食，捕食方式可能为空中捕食或掠食，捕食对象是中等大小的静止猎物，主要是双翅目的昆虫．     

中国凹耳蛙用高频声进行种内通讯

与绝大多数蛙不同,凹耳蛙发出高频叫声,以避开强环境噪声的掩蔽;雌蛙排卵前产生高频求偶声,诱发雄蛙以超精确度趋近雌蛙;雄蛙能自主开闭咽鼓管,以调谐高频听觉。凹耳蛙进化的这些特征是对嘈杂生境的适应,在其他两栖动物中尚未发现,这对研究动物声通讯进化很有价值。鉴于凹耳蛙为中国特有,数量稀少,分布地区狭窄,建议将它列为稀有濒危物种予以保护。     

"免疫系统"方法在系统级入侵检测中的应用

"免疫系统"方法是在研究了特权程序对应的系统调用短序列具有很强的稳定性的基础上提出的.一个基于"免疫系统"方法的 Linux 系统级入侵检测模型,并讨论了此入侵检测模型的实现技术.     

Echolocation calls ofMyotis frater (Chiroptera: Hipposideridae) during search flight

Echolocation calls ofMyotis frater emitted during the search phase consist of brief frequency-modulated pulses. The sound signals are comprised of three harmonics of which the first one is of the highest intensity and occurs in all echolocation calls. The frequency of this fundamental harmonic ranges from 110.8 to 50.2 kHz, and its duration is about 3.5 ms. The second and the third harmonics are relatively weak, occurring in 50.0% and 25.0% of echolocation calls respectively, with frequencies ranging from 138.4 to 116.6 kHz for the second harmonic and from 193.6 to 170.8 kHz for the third harmonic. We presume that, according to the echolocation call features,Myotis frater probably forages the insects on the ground of complex environments.