嵌入式高速低功耗ROM设计研究

提出了一种改进的单相钟控的并联型ROM电路 ,该结构缩小了位线的电压摆幅 ,使电路速度提高 ,功耗降低 ,周边接口规整 ,连接方便 ,特别适合作为嵌入式ROM集成于片上系统 (SOC)中 .用 0 6 μmCMOS标准工艺设计了 1k× 2 8bitROM ,并嵌入微处理器芯片设计中 .模拟和流片结果表明 ,该ROM的读取时间小于等于 12ns ,功耗约为 0 82mW /MHz ,面积为 (0 6 4× 0 6 3)mm2 .     

一类高阶非线性摄动微分方程的振荡定理

对一类高阶非线性摄动微分方程［ａ（ｔ）φ（ｘ（ｎ）（ｔ））ｘ（ｔ）］－ｍ（ｔ）φ１／２（ｘ（ｎ）（ｔ））ｘ（ｔ）＋Ｑ（ｔ,ｘ,ｘ）＝０（ｎ＝０,１,…）在满足一定的条件下,建立了若干使该方程解振荡的充分条件．该结果推广了原有结论,扩大了应用范围     

A Parallel Decision Model Based on Support Vector Machines and Its Application to Fault Diagnosis

Many industrial process systems are becoming more and more complex and are characterized by distributed features. To ensure such a system to operate under working order, distributed parameter values are often inspected from subsystems or different points in order to judge working conditions of the system and make global decisions. In this paper, a parallel decision model based on Support Vector Machine (PDMSVM) is introduced and applied to the distributed fault diagnosis in industrial process. PDMSVM is convenient for information fusion of distributed system and it performs well in fault diagnosis with distributed features. PDMSVM makes decision based on synthetic information of subsystems and takes the advantage of Support Vector Machine. Therefore decisions made by PDMSVM are highly reliable and accurate.     

Detecting DDoS Attacks against Web Server Using Time Series Analysis

Distributed Denial of Service （DDoS） attack is a major threat to the availability of Web service. The inherent presence of self-similarity in Web traffic motivates the applicability of time series analysis in the study of the burst feature of DDoS attack. This paper presents a method of detecting DDoS attacks against Web server by analyzing the abrupt change of time series data obtained from Web traffic. Time series data are specified in reference sliding window and test sliding window, and the abrupt change is modeled using Auto-Regressive （AR） process. By comparing two adjacent nonoverlapping windows of the time series, the attack traffic could be detected at a time point. Combined with alarm correlation and location correlation, not only the presence of DDoS attack, but also its occurring time and location can be deter mined. The experimental results in a test environment are illustrated to justify our method.     

以固载杂多酸盐TiSiW12O40/TiO2做催化剂合成DPOMA

以自制的固载杂多酸盐TiSiW12O40/ TiO2做催化剂,用双环戊二烯、乙二醇和甲基丙烯酸为原料合成了甲基丙烯酸双环戊二烯氧基乙酯(DPOMA),并用红外光谱对目标产物及TiSiW12O40/ TiO2进行了表征.结果表明,固载杂多酸盐催化剂对酯化合成DPOMA具有催化活性高、酯收率大、产品后处理简单且具有易于回收、可多次重复使用和不污染环境等优点.     

Fe—Cr—Ni—Mn—Si不锈铁基合金的形状记忆效应

利用热膨胀仪、光学金相和透射电子显微镜、Ｘ射线衍射仪等测试方法研究了Ｆｅ－Ｃｒ－Ｎｉ－Ｍｎ－Ｓｉ不锈铁基合金的形状记忆效应，探索了形变量、形变温度和热处理工艺等因素对其形状记忆效应的影响规律、并对不锈铁基合金的形状记忆机理进行了初步探讨。试验结果表明，经１０５０℃固溶处理，室温拉伸形变在２％（或弯曲角在１２０°）以内，于３５０℃回复后，可获得较好的形状记忆效应。其形状记忆效应来源于形变时产生的大量     

白云凹陷断裂特征及对构造与沉积控制的作用

南海北部珠江口盆地白云凹陷的地震资料分析显示,该区域自始新世以来断裂系统十分发育.断层表现出张性或张扭性特征并具有多期活动的特点.在平面上,断裂主要为NWW、近EW和 NE向.根据断层平面展布及组合形态,可将它们分为平行断层系、雁列断层系和树枝状断层系3种组合形式.根据断裂发育时间及规模,可将断裂的活动期次划分为以下几个阶段：剧烈活动期（Tg—T8）、较强中等活动期（T8—T6）、平静稳定期（T6—T2）、再度活化期（T2—T1）.断裂发育的时间及特点对凹陷的构造演化和沉积过程起着重要的控制作用.     

方程与粒子穿透几率

在一般情况下,导出了抛物线位垒的穿透几率,并在特殊情况下再现了半经典结果。引入镜像算符讨论了势垒和势阱的互补性,以及Weher方程与Schordinger方程、Hermite方程之问的关系。     

Research on android malware detection and interception based on behavior monitoring

Focusing on the sensitive behaviors of malware, such as privacy stealing and money costing, this paper proposes a new method to monitor software behaviors and detect malicious applications on Android platform. According to the theory and implementation of Android Binder interprocess communication mechanism, a prototype system that integrates behavior monitoring and intercepting, malware detection, and identification is built in this work. There are 50 different kinds of samples used in the experiment of malware detection, including 40 normal samples and 10 malicious samples. The theoretical analysis and experimental result demonstrate that this system is effective in malware detection and interception, with a true positive rate equal to 100% and a false positive rate less than 3%.     

半刚性基层抗冲刷性能分析

文章分析半刚性基层的裂缝产生原因,大多数并非承栽力不足引起,而是抗冲刷能力不足导致使用寿命缩短,进一步通过冲刷试验来分析基层抗冲刷性能特点,同时得出从冲刷试验到数据处理方面相关建议.