基于OSPF的ASON路由的一种加密方案

自动交换光网络(ASON)控制协议采用通用多协议标签交换(GMPLS)控制协议族,其路由部分主要为开放式最短路径优先(OSPF)协议.文章分析了OSPF协议加密措施存在的安全隐患,并对现有的加密方案进行了改进.针对OSPF协议的安全模式,提出了一种可以应用于ASON中路由技术的新的安全性方案.基于数论算法,实现S盒动态调整,通过动态产生的子密钥,在迭代过程中对分组进行加密.     

OPC 技术与应用

OPC规范是应用软件与数据源的通用接口标准，实现了应用软件与现场设备的开放的、无缝隙的联接。OPC作为新技术，在工业自动化中占重要的地位。分析了OPC技术及其在工控中的应用。     

基于微控制器的AES激光注入攻击研究

密码设备面临故障攻击的威胁,针对密码芯片的故障攻击手段研究是密码学和硬件安全领域的重要研究方向。脉冲激光具有较好的时空分辨性,是一种准确度较高的故障攻击手段。该文详细描述了激光注入攻击的原理和方法,以集成AES-128算法的微控制器(MCU)为例实施了激光注入攻击实验。实验以微控制器的SRAM为攻击目标,分别成功实现了...     

关于智能电度表的误差分析与修正

本文详细介绍了多功能智能电度表在研制过程中，分析与修正了由计算机采样与计算所引起的电量值误差的原因，并由此研制出一种多功能智能电度表，以及一种简单易行的误差修正的编程算法。     

电子在磁镜系统中的运动

本文研究具有任意初始入射条件的电子在磁镜系统中的运动。研究发现,在中心轨道确定之后,任何其它轨道可以区分为正常轨道或非正常轨道。在正常轨道上运动的电子接受动量选择狭缝的选择,而在非正常轨道上运动的电子不受动量选择狭缝的作用。文中给出了正常轨道上的任一微分弧元在中心轨道坐标系中的投影的计算方法,并且经大量的数值计算证明是可靠的。这一工作对于了解带电粒子束在通过磁镜系统时的运动的详细过程有重要意义。     

Male european corn borer,Ostrinia nubilalis (Hübner), antennal responses to analogs of its sex pheromone

Experiments were conducted to (1) determine whether the electroantennogram (EAG) can detect differences among the responses of antennae from males derived from the three strains ofOstrinia nubilalis (Hübner), and (2) characterize the EAG responses of each strain to isomeric forms of the natural pheromone, (E)- and (Z)-11-tetradecen-1-ol acetate (TDA), and analogs possessing differences in the terminal alkyl group, cyclopropyl (CPA), ortert-butyl (TBA).EAG responses differed among the strains in two ways: (1) Antennae fromZZ males always produced an EAG to (Z)-TDA with an extended duration of response. This signature EAG response was found to be unique to the antennal response ofZZ males to (Z)-TDA, thus providing a relatively easy method of distinguishing liveZZ males fromEE orZE males. Correlated with this longer EAG response was a longer disadaptation time, i.e., the EAG response ofZZ antennae disadapted more slowly (ca. 10 min) than the response ofEE antennae. (2) Strain differences in the relative EAG amplitudes to isomers and analogs were observed at the stimulus amounts eliciting the peak EAG amplitude as follows: TDA CPA > TBA forZZ males and both isomers; TDA > CPA TBA and CPA TDA > TBA forEE males and theE andZ isomers, respectively; CPA > TBA TDA forZE males and both isomers. Dose—response relationships were seen for all compounds if amplitude (peak height) of the EAG was used as a measure of response. However, if width of the EAG at half the peak height (peak width) was used, then only theZZ antennal response to (Z)-TDA resulted in a meaningful dose-response relationship. For all strains, the EAG amplitudes elicited by theZ isomers of any of the tested compounds were greater than those elicited by the correspondingE isomers. Therefore, correlations between the relative EAG and upwind flight responses were observed in theZZ (r = 0.86) andZE (r = 0.80) strains but were not correlated in theEE strain (r = 0.18). Temporal studies showed that adaptation, not postexcision deterioration, was responsible for the observed decreases in the EAG amplitude after repetitive stimulation or after stimulation with amounts in a descending order. Disa-daptation required at least 20 min for a moderate dose (10 g for 1 sec). Developmental studies showed that antennae from 2-day-old adults had the greatest EAG response.     

轨道交通安全性标准简介

建立以轨道交通为主的交通系统是改善城市交通的有效途径,其运营工作牵涉到千百万乘客的安全出行,因此．轨道交通系统的安全运行是轨道交通领域亟待解决的问题,该文将简单介绍与轨道交通安全性相关的IEC国际标准、欧洲标准以及国家标准。     

H.264编码器中1/4像素精度插值算法的VLSI实现

H.264视频编码标准中引入了1/4像素精度插值算法,大大提高了压缩效率,但同时使运算复杂度增加、存储带宽增大。针对以上问题,从运动估计的角度出发,采用一步插值法和数据复用技术,可使带宽减少26%,处理周期可减少45%;设计了相应的硬件结构:采用了5级流水线实现一步插值算法,通过输入缓冲单元实现了参考数据的复用;针对插值过程中产生的大量数据,采用乒乓操作结构,保证数据及时传递。该结构可以显著降低带宽,提高吞吐率,完全可以应用于实时编码器中。     

基于空间场屏蔽效能测试方法研究

基于空间电磁场屏蔽效能测试中,目前存在着各种测试标准,虽然每种方法都能获得实验数据,但是不同测试方法下的实验数据差异性很大,不具有可比性。针对以上问题,该文对各种方法的选用、原理以及优缺点展开详细的研究和分析,并对基于空间电磁场屏蔽效能测试方法标准的统一性和规范化做了相应的建议和尝试,来优化和控制屏蔽部件、屏蔽材料和屏蔽实体的屏蔽效能测试,使测试标准更加符合实际测试和生产实践。     

新一代静止图像编码系统-JPEG2000

JPEG2000是最新制定的静止图像编码国际标准，JPEG2000不仅提供的率失真性能和主观图像质量优于原JPEG标准，而且在支持渐进图像传输、感兴趣区图像编码和抗误码性能上也优于传统的JPEG标准和其它编码方法。本文对JPEG2000系统的结构、特性以及其编码算法进行了分析，并给出JPEG2000与原JPEG标准的性能比较。