逆合成孔径雷达运动补偿中一种包络对齐新方法

逆合成孔径雷达(ISAR)成像中,包络对齐是初相校正和图像重构的基础。基于刚体模型的包络相关法对具有大动态范围的回波处理时对齐效果较差,针对这一问题,本文提出了一种基于自适应幂变换的相关包络对齐新方法,对齐质量明显提高,大量实测数据验证了该方法的有效性。     

目标高速运动对宽带一维距离像的影响及补偿方法研究

从宽带线性调频雷达信号目标回波的精确模型入手,分析了目标速度、信号时宽带宽积对目标一维距离像的影响,为提高一维距离像的质量,提出了有效的运动补偿方法,最后给出了仿真结果,验证了本文的分析结果的正确性。     

探讨虚拟仪器与传统仪器的关系

通过论述虚拟仪器和传统仪器的特点,并进行了比较,提出在基础实验室和专业实验室中应如何有效地配置虚拟仪器和传统仪器。     

多方数据共享环境下匿名化数据的安全性量化方法(英文)

This paper aims to find a practical way of quantitatively representing the privacy of network data. A method of quantifying the privacy of network data anonymization based on similarity distance and entropy in the scenario involving multiparty network data sharing with Trusted Third Party (TTP) is proposed. Simulations are then conducted using network data from different sources, and show that the measurement indicators defined in this paper can adequately quantify the privacy of the network. In particular, it can indicate the effect of the auxiliary information of the adversary on privacy.     

基于TM1300视频编码盒的码率控制算法研究

本文以基于TM1300视频编码盒为硬件平台,分析传统的H.263视频编码控制算法,对TMN5和TMN8算法进行折衷,提出一种新的算法,该算法计算较简单,且缓存的充盈度较平稳,能满足低时延缓存的码率输出要求。     

层次化跨区域SDN验证示范系统的设计与建设

软件定义网络（SDN）架构给网络带来了卓越的灵活性和可管理性。为了给新型SDN技术与应用提供大规模可行性验证试验床与试点部署平台,提出了依托于CERNET的层次化跨区域SDN 异地验证示范网络试验系统的总体架构,建设了9个城市、13个节点的SDN验证示范核心网与包含3个数据中心的接入网,并对基于SDN的vCPE智能专线业务、IPv4/IPv6过渡技术、流量监控调度应用和数据中心应用进行验证与示范。     

基于流标签的新型可降维IPv6报文分类算法

Traditional packet classification for IPv4 involves examining standard 5-tuple of a packet header, source address, destination address, source port, destination port and protocol. With introduction of IPv6 flow label field which entails labeling the packets belonging to the same flow, packet classification can be resolved based on 3 dimensions: flow label, source address and destination address. In this paper, we propose a novel approach for the 3-tuple packet classification based on flow label. Besides, by introducing a conversion engine to covert the source-destination pairs to the compound address prefixes, we put forward an algorithm called Reducing Dimension (RD) with dimension reduction capability, which combines heuristic tree search with usage of buckets. And we also provide an improved version of RD, called Improved RD (IRD), which uses two mechanisms: path compression and priority tag, to optimize the performance. To evaluate our algorithm, extensive experiments have been conducted using a number of synthetically generated databases. For the memory consumption, the two proposed new algorithms only consumes around 3% of the existing algorithms when the number of filters increases to 10 k. And for the average search time, the search time of the two proposed algorithms is more than four times faster than others when the number of filters is 10 k. The results show that the proposed algorithm works well and outperforms many typical existing algorithms with the dimension reduction capability.     

基于Web Services服务管理协议的设计与分析

该文提出基于Web Services的服务管理协议(WSSMP),用于有效地管理跨不同管理域的服务。利用Petri网对WSSMP进行了形式化描述,并利用Petri网的可达性分析对此协议进行了逻辑正确性验证,确保了此协议具有有界性、活性、完整性、前进性等性质,从而减少了协议设计中潜在的错误。并在仿真平台上进行了协议测试,测试表明读取大量对象时,随着读取对象数的增多,压缩WSSMP所使用的带宽增加很少,该协议适应服务管理需要大量处理数据的特性。     

图像处理技术在ATM监控系统中的应用

将图像处理技术运用于ATM自动柜员机数字监控系统,可突破传统监控系统的局限性。本文介绍了该系统的硬件组成,并给出了一种高效的基于小波变换的彩色图像压缩算法,有效的节约了存储空间。     

利用RCS序列估计空间目标尺寸的方法研究

目标RCS包含了丰富的目标信息,由目标RCS推求目标结构和尺寸信息却非常困难。针对这一问题,本文 先将空间目标简化为一椭球体,在此基础上提出了一种利用目标RCS序列估计目标长轴和短轴尺寸的方法。实测数据处 理结果表明,该方法能有效估计出目标的长轴和短轴尺寸,而且估计尺寸稳定性好,有利于空间目标的分类和识别。