基于HLA仿真的空战动态效能评估研究

为建立战斗机空战对抗模拟仿真环境,进行战斗机空战动态效能评估和演示验证,方便空战战术技术的研究,分别提取超视距空战和视距内空战阶段的动态评估指标体系,综合考虑对抗过程中的诸多因素,利用HLA/RTI技术,详细设计和开发了仿真系统中各联邦成员仿真对象模型.将现代空战过程划分为若干赋权子阶段,并借助于先进分布式仿真技术的空战效果评估,是实现空战动态效能评估与仿真的一种有效方法.     

超视距空战的几个观点

介绍了超视距空战武器发展和实战应用,提出了和超视距空战有关的几个观点:信息战和网络中心战是如何影响超视距空战,在超视距中指挥协同和信息的问题,超视距空战和多目标攻击的关系,在超视距空战研究中容易忽视的问题——在空战中如何对付敌方超视距武器,评价战斗机超视距空战能力要考虑的问题,超视距和视距内空战的界限可能逐渐模糊以及无人机在超视距空战中的作用。     

基于AHP法的天波超视距雷达作战效能评估模型

根据天波超视距雷达的工作特性和作战任务,运用层次分析法,给出了天波超视距雷达作战效能评估指标的层次结构,确定了各效能指标及相对权重的计算方法,得出了天波超视距雷达作战效能评估的数学模型,为该雷达的发展改进及作战使用提供辅助的决策依据。     

天波超视距雷达作战效能综合评估研究

为全面准确评估天波超视距雷达作战效能,提出了一种基于模糊层次决策的天波超视距雷达作战效能综合评估模型。建立了一种较为系统的天波超视距雷达作战效能综合评估指标体系。将层次分析法与模糊综合评判方法应用到雷达作战效能评估中,介绍了作战效能评估方法和步骤,最后以某型天波超视距雷达为例进行了实例应用与分析。结果表明,该评估模型实用有效,为天波超视距雷达的研制、改进、优化部署以及作战使用提供了辅助的决策依据。     

超视距空战领先能力研究

运用数值仿真法研究了电子对抗条件下歼击机超视距空战中的领先能力.提出了超视距空战效能指标,利用蒙特卡罗法建立了超视距空战仿真流程图.通过算例评估了领先探测效能、领先发射效能、领先击毁效能,分析了脉冲积累、脉冲重复频率、远距支援干扰、自卫干扰以及机载自卫干扰定位技术对效能指标的影响,指出了歼击机在不同电子对抗环境下探测、...     

灰色关联投影法在战斗机空战效能评估中的应用

提出了一种基于多目标决策灰色关联投影的战斗机空战效能评估方法,介绍该方法的基本原理,根据战斗机的机动性、火力、探测目标能力、操纵效能、生存力、航程和电子对抗能力等指标,运用多目标决策灰色关联投影法对现役世界各国主战飞机进行评估。结果合理,说明该方法用于空战效能评估是可行的。     

基于改进ADC模型的天波雷达作战效能评估

天波雷达能够在防空、反导、对海监视等多个领域发挥重要作用,已成为各大国战略预警体系中的重要装备。为全面准确评估天波超视距雷达的作战效能,结合天波雷达作战使用特点,系统分析了电离层状况和电磁环境对天波雷达的影响,建立了天波雷达作战效能评估指标体系,提出了一种改进的ADC模型。采取定量和定性相结合的评估方法,根据有效探测威力、探测精度、发现概率等指标数据,客观评定了雷达作战效能,为作战运用和装备论证提供了科学决策依据。     

基于模糊网络的天波雷达作战效能评估北大核心CSCD

为克服传统天波超视距雷达作战效能评估技术的局限性,提高天波雷达作战效能评估可信度,提出了基于模糊神经网络的作战效能评估模型。该模型将神经网络、专家系统、模糊推理等技术有机结合,既能处理模糊知识,又能进行自学习,克服了人为因素和模糊随机性对评估结果的不良影响。仿真结果表明,评估结果更为合理可信,并具有良好的鲁棒性。该模型可为天波超视距雷达的研制、改进、优化部署和作战使用提供辅助决策依据。     

一种适用于四代机的多目标威胁评估算法

针对传统的空战多目标威胁评估不适于第四代战斗机超视距多目标空战威胁评估的问题, 提出了一种新的适合第四代战斗机超视距多目标空战的威胁评估方法。该方法在传统多目标威胁评估的基础上, 考虑空战高度和第四代战斗机隐身性能, 分别运用模糊优选法和区间层次分析(IAHP)法解算主客观权重, 进而得到综合权重区间, 并运用改进的TOPSIS法进行多目标威胁评估研究。仿真结果表明该算法的有效性和合理性, 适合于第四代战斗机超视距多目标空战的威胁评估。     

歼击机雷达综合瞄准系统超视距空战中的效能

探讨了在超视距空战中歼击机雷达综合瞄准系统(RLPK)的效能评估方法问题。通过分析雷达综合瞄准系统在超视距空战中的典型工作状态,采用概率分析法提出了效能指标。运用概率论相关知识,分别建立了雷达综合瞄准系统在远距导引阶段、搜索与发现/识别阶段、威胁评估/火力分配阶段、小区搜索/截获/跟踪阶段以及空空导弹制导阶段的效能模型。算例表明:系统的工作周期越短,抗干扰能力越强,系统在超视距空战中的效能越大;目标与火力分配环节对单机单目标空战影响不大,但对单机多目标与多机多目标空战影响较大。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks