曲线的无模式回归

本文提出曲线无模式回归思想、从而避免了曲线模式的选择。通过解带约束级值问题。得到问题的解析解，文中给出了具体回归实例。     

Redhat Linux9超级用户密码与安全

介绍了紧急修复模式和单用户模式两种方法，用于实现Linux超级用户口令的恢复。针对Linux系统的安全性，通过相关命令功能解析和配置实例，给出了防止绕过超级用户的密码验证进入计算机系统的安全解决方案。     

基于代价函数的动态分布式解析映射机制

针对身份与位置的动态解析映射问题,依据终端的移动模式和通信特征,提出了一种基于代价函数的动态分布式移动解析映射机制。该机制将移动终端的通信状态划分为移动更新、均衡传输和解析查询3种通信模式,以最小化解析映射代价为目标,分别提出了基于分布式多播、一致性散列协同和主动式域内共享的解析映射方法,设计了对应的注册更新、解析查询和数据路由解析优化策略。仿真结果表明,该机制实现了移动过程中解析映射代价的最小化,具有较小的解析时延,对网络结构的动态变化具有良好的适应性。     

DNS安全防护探讨

本文主要介绍了DNS的定义、分类、解析过程和查询模式，并针对目前DNS所面临的安全形势，提出了加固DNS安全防护的措施。     

基于规则的域名WHOIS信息抽取技术研究

域名WHOIS数据包含域名所有权的相关信息,包括域名创建信息、注册者信息等,是网络空间实体与社会空间实体相关联的重要数据来源。然而,WHOIS协议仅在传输机制方面具有统一的标准,查询获得的域名注册信息在格式和内容上还存在较大差异,数据呈现多种模式。针对WHOIS数据存在多种模式,难以进行信息准确抽取的问题,设计实现了WHOIS信息的批量获取方法和基于规则的WHOIS信息解析器(rule-based parser),提升了域名WHOIS信息获取效率和分析准确率。通过合理设计解析字段,构建详尽的规则库,解决了不同模式下WHOIS信息解析效率不高的问题。与传统解析器对比,基于规则的WHOIS信息解析器能解析更多的顶级域名WHOIS信息,并能以更高的成功率和更低的时间开销完成对WHOIS信息的解析,能够为网络空间测绘、网络公害治理等方向提供技术和数据支撑。     

非均匀介质中非对称耦合传输线的ABCD参数

采用新的方法推导出非均匀介质中非对称耦合传输线一般A参数(ABCD参数)的解析表达式，给出了以正规模式参量描述的A参数表达式。所得A参数表达式形式简明，物理概念明晰。通过矩阵分块运算，由z参数推导A参数，对所给表达式进行了验证。验证结果表明了所得A参数解析表达式的正确性和本文方法的有效性。并用所推导出的A参数设计计算了非对称支持宽边耦合共面波导开路节级联构成的带阻滤波器。A参数解析表达式的导出为非均匀介质中非对称耦合传输线在三维(多层)微波集成电路中的应用提供了有力的理论工具。     

敏捷工作流模式研究及应用

为了增强工作流系统对业务流程变化的适应性,提出了一种敏捷工作流模式,它是一个模式系统,由工作流体系结构模式、模型描述模式、模型表示模式和模型解析模式组成.深入讨论了这种模式的设计思想,并详细描述了上述4个组成部分.最后,通过该模式在实际开发中的应用表明,敏捷工作流模式对于实现柔性的工作流系统具有很高的应用价值.     

有耗介质中的等离子体波导

分析了有耗介质中等离子波导中存在的一般模式，重点讨论了波导衰减常数随等离子体参数和介质参数的变化，导出了各种模式的模方程，并给出了相应近似解的解析表达式。     

检测设备——microXCT显微CT X光检测系统

microXCT缺陷检测系统运用了非破坏性3D层析技术，检查高级封装的完整构架。不同于传统X光成像系统，microXCT不会在层析过程中损失解析度，相反却能对3D封装进行全解析扫描。多重解析模式使用户得以简易地从30μm导航转换至1微米高解析缺陷定位和表征。     

基础运营商如何与VNO共舞

虚拟电信运营概念解析 虚拟电信运营一般是指虚拟运营商（VNO）不拥有基础电信网络而经营电信基础或增值业务，通过租用基础运营商的基础网络设施或购买业务，将业务细分和个性化，使其更适合于用户需求，然后贴上自己的商标以自己的品牌向用户提供通信服务。当前，国际电信业流行的虚拟运营模式包括代理、转售、提供增值业务等多种业务模式。     

Calculation of the frequency characteristics of the electromagnetic radiation of waveguide-horn antennas

A method for calculation of the frequency characteristics of the electromagnetic radiation of waveguide-horn antennas is proposed. The method is based of frequency expansions of the field of the electromagnetic radiation of the antenna excited by auxiliary finite pulses. This radiation is calculated with the use of the method of nonstationary waveguide equations and the concept of a virtual electromagnetic waveguide. Examples of calculation of the amplitude-phase characteristics of the circuit and radiation patterns at fixed frequencies are presented. It is shown that a high accuracy of determination of frequency characteristics is attainable in rather wide frequency band.     

Determination of the Mode Content in Spurious Microwave Radiation of the Gyrotron with a Straight Axisymmetric Output

The method for determination of the mode content of a spurious microwave radiation of the gyrotron with a straight circular axisymmetrical output is discussed. As demonstrated, in the test task accuracy of this method is several percents. The experimental results on the determination of the mode content at the output of the coaxial gyrotron, operating on the mode TE _14.8 are in a good agreement with the theoretical calculations.     

同轴波导口面的辐射特性研究

为了研究同轴口面的辐射特性,从同轴口面的电磁场的矢量模函数出发,应用口面场的傅里叶变换求解同轴口面的辐射场,研究了同轴区域的电尺寸、同轴喇叭张角与2个常用的高次模辐射特性之间的关系,给出了2个常用模式的比例与辐射方向图的关系和供工程设计用的参考数据。     

多径衰落信道的分数布朗运动模型

本文旨在将分形理论引入多径衰落信道的研究,从非线性科学的角度出发建立了多径信道的分数布朗运动模型.通过探讨多径信号的增量统计分布、统计自相似性、广义功率谱和分形维数,揭示了多径衰落与分数布朗运动间的内在联系;指出信号的分维是描述无线信道传播特性的重要参数;在分形模型的基础上,对多径信号进行了重构.实验结果表明,无线信道的分数布朗运动模型比传统的随机模型能更有效地刻划和描述多径衰落的行为.     

面源红外诱饵技术特性及材料组分研究

介绍了国外2种典型面源红外诱饵的技术特征,对红外成像制导导弹制导过程进行了分析,研究了面源型红外诱饵干扰红外成像制导导弹的干扰模式,分析了面源型红外诱饵的光谱辐射特性、辐射对比度、辐射时间特性和辐射面积特性,探讨了2类主要面源型红外诱饵材料的化学组分及燃烧辐射特性等.     

手征介质圆波导中阶梯不连续性的散射和辐射特性研究

采用多模网络与严格模匹配相结合的方法，对开放型手征介质圆波导中的二种阶梯不连续性的散射和辐射特性进行分析和求解，仔细讨论了手征参数和几何尺寸对散射和辐射特性的影响．给出的结果对手征介质元器件的研究有实际的参考意义．     

SCATTERING AND RADIATION CHARACTERISTICS OF STEP DISCONTINUITY IN LEFT-HANDED SLAB WAVEGUIDE OPERATING IN EVANESCENT SURFACE MODE

The scattering and radiation characteristics of a step discontinuity in left-handed (LH) slab waveguide operating in evanescent surface mode of TE and TM polarization are analyzed by a method, which combines the rigorous mode-matching method with the multi-mode network theory. In the analysis the radiation problem is transformed into a propagation problem so as to tremendously simplify the calculation procedure. The dispersion properties of the grounded planar LH slab waveguide for both ordinary and evanescent surface modes are examined, from which the left-hand property of the operating mode is testified. The relative scattered power and radiation pattern of the step are given for the first time, from which the backward radiation of the stepped LH guide is clearly demonstrated. The frequency scanning characteristics of the step under consideration in this paper are just opposite to that of the ordinary antenna, which makes the considered structure promising candidate for new type of planar antennas.     

Characteristics of millimeter-wave radiation in a corrugatedferrite slab structure

The characteristics of millimeter-wave radiation in a corrugated ferrite slab supported by a grounded dielectric slab are investigated both theoretically and experimentally. Theoretical analysis is performed by the perturbation theory combined with multiple space scales for the transverse electric mode. A pair of amplitude transport equations are derived, and the characteristics of the leaky wave are explained in terms of the radiation angle and the radiation efficiency. Experiments were carried out using a layered structure composed of a corrugated polycrystalline yttrium iron garnet slab and a Teflon slab in the frequency range from 40 to 50 GHz. The experimental results are compared with the theory     

暗室消光性对激光侦察告警辐射仿真测试的影响

研究了利用激光暗室进行的激光侦察告警辐射式仿真测试模式,提出利用激光指示信 号模拟装置的仿真测试方案。分析了仿真测试中暗室漫反射干扰引起的虚警的干扰模式原因和表现,根据激光目标指示器和激光测距机战场使用与大气传输的理论分析,给出了告警激光信号能量功率的仿真计算模型,探讨了激光暗室各个漫反射表面的漫反射特性、漫反射系数(反射率)等因素对激光侦察告警辐射式仿真测试的影响,为进行激光被动侦察告警辐射式仿真测试提供理论依据和参考。     

Radiation characteristics of corrugation loaded dielectric-coated conducting cylinder

The radiation characteristics of a corrugation loaded dielectric coated conducting cylinder are investigated theoretically for the infinite periodic and finite structures. For the infinite periodic structure, the mode matching method is applied. The integral equation is derived for the finite structure by use of the Fourier transform and mode expansion. The influences of the corrugation width, corrugation depth, dielectric thickness, cylinder radius, and finite corrugation number on the radiation characteristics (leakage constant, phase constant, and radiation pattern) are investigated. The results of the finite periodic corrugations are compared with those of the infinite extent structure and good agreement is found. To reduce the high side lobe of the uniform periodic structure, nonuniform quasiperiodic corrugation arrays are considered. The surface wave radiated by the structure having end-fire radiation pattern is also investigated.