外太空有源假目标的运动学特性

弹道导弹突防过程中释放的有源干扰装置能够产生在能量、波形和相位调制等方面与目标回波高度逼近的假目标,这些假目标会共享雷达信号处理器的相干处理增益,使得传统的信号处理鉴别方法失效,并在数据处理层形成大量虚假航迹。该文从理论上分析了外太空有源假目标的运动学特性,推导了其在典型坐标系下的运动方程,揭示了有源假目标在运动学特性上和实体目标间的根本差异。首先,建立了统一的数学描述模型,推导了假目标在雷达站直角坐标系、雷达站球坐标系和地心坐标系下的运动方程;其次,根据运动方程分析了假目标的轨道、速度和加速度特性;最后,研究了相关因素对假目标运动学特性的影响。该文的分析结果可以为基于运动学信息鉴别有源假目标的系列方法提供理论指导。     

考虑工艺波动影响的RLC互连统计延时

该文提出了一种考虑工艺波动的统计RLC互连延时分析方法。文中首先给出了考虑工艺波动的寄生参数和矩的构建方法,然后基于Weibull分布给出了RLC互连的统计延时模型。所提方法同样适用于已有的延时模型如Elmore模型,等效Elmore模型和D2M模型。通过对几种模型的比较,表明,基于Weibull分布的RLC互连的统计延时模型是最精确的,和HSPICE相比,50%延时误差最大0.11%,蒙特卡洛分析中的均值和平均偏差误差最大2.02%。     

An Efficient Time-Domain Algorithm for the Simulation of Heterogeneous Dispersive Structures

In this paper a new general numerical algorithm for the simulation of heterogeneous dispersive structures is presented. The general algorithm is based on the ADE-FDTD approach. It finds its strength in the simulation of cases where different materials with different dispersion types are present. Several numerical examples are presented and results are compared to analytical solutions. While having the same level of accuracy, the proposed algorithm offers savings in both memory and computational requirements, compared to other ADE-based methods.     

基于家庭关联关系识别模型的电信融合套餐营销

本文回顾了中国电信承接原联通C网以来的全业务融合套餐现状,分析了识别原有CDMA手机号码与固定电话号码的关联关系对于电信融合套餐营销的意义,详细描述了利用决策树算法来构建家庭关联关系识别模型的过程和方法,并简要介绍了如何应用模型结果进行融合套餐的针对性营销.     

Consensus Based Least Squares Estimation for Single-Integrator Multi-Agent Systems with a Time-Varying Reference State

This paper discusses consensus tracking of single-integrator multi-agent systems with a time varying reference state based on the least squares estimation theory to deal with the case of communications disturbance. Since none of the followers can communicate with the leader within the accepted time due to communications disturbance, least squares estimation is applied for online estimation of the time varying reference state and reducing the tracking errors occurred due to communications disturbance. A theoretical proof is provided under some assumptions while the necessary and sufficient conditions are demonstrated for which consensus is reached on the time-varying reference state in case of communications disturbance. Finally, a Matlab example is given to validate the effectiveness of the proposed approach.     

VR技术助力虚拟实验教学平台发展的策略研究

虚拟现实已成为当今时代的热点话题,并渗透很多行业、领域,无形中给人们带来了较多方便与益处。文章主要研究虚拟现实技术在货币知识教学中的应用,通过VR技术开展中国货币发展史的虚拟教学研究,也让VR技术助力于虚拟实验教学平台的发展。     

标准模型下增强的基于身份的认证密钥协商协议

密钥抽取是密钥协商协议的一个重要环节,该文指出2007年王圣宝等人提出的标准模型下基于身份的认证密钥协商协议在该环节存在重要缺陷;并根据密钥抽取函数的不同功能,将标准模型下密钥抽取细化为随机提取和密钥抽取两个步骤,并基于Kiltz等人提出的基于身份的加密方案,设计了一个新的认证密钥协商协议IBAKE,其安全性证明规约更严谨,协议执行效率更高。     

泛在网络资源管理模型的研究

泛在网络作为未来网络,存在自治性、异构性、复杂性、混沌性等挑战。泛在网络计算环境下资源的组织与管理、竞争与共享、分配、负载均衡等问题成为泛在网络发展的障碍。结合移动Agent技术,提出了一种基于移动Agent的泛在网络资源管理层次模型,为使用者提供一个分布的、易于扩展的、高效实用的泛在网络计算环境。     

Effective appearance model for probabilistic object tracking

This paper presents a robust object tracking approach via a spatially constrained colour model. Local image patches of the object and spatial relation between these patches are informative and stable during object tracking. So, we propose to partition an object into patches and develop a Spatially Constrained Colour Model (SCCM) by combining the colour distributions and spatial configuration of these patches. The likelihood of the candidate object is given by estimating the confidences of the pixels in the ...     

AlGaN/GaN HEMT 小信号模型提取方法的改进

The accurate extraction of AlGaN/GaN HEMT small-signal models, which is an important step in largesignal modeling, can exactly reflect the microwave performance of the physical structure of the device. A new method of extracting the parasitic elements is presented, and an open dummy structure is introduced to obtain the parasitic capacitances. With a Schottky resistor in the gate, a new method is developed to extract Rg. In order to characterize the changes of the depletion region under various drain voltages, the drain delay factor is involved in the output conductance of the device. Compared to the traditional method, the fitting of S 11 and S 22 is improved, and fT and fmax can be better predicted. The validity of the proposed method is verified with excellent correlation between the measured and simulated S-parameters in the range of 0.1 to 26.1 GHz.