基于VPRSM和相对熵排序法的辐射源威胁评估

辐射源威胁评估属于多属性决策问题,逼近理想解排序(TOPSIS)法作为经典的多属性决策方法,在威胁评估中应用广泛,但TOPSIS存在人为设定权重和位于正、负理想点中垂线上的对象无法进行区分排序的问题。针对TOPSIS法的问题,提出了基于变精度粗糙集模型(VPRSM)和相对熵排序法的辐射源威胁评估方法。该方法首先基于VPRSM利用先验辐射源数据信息确定权重;然后,将相对熵引入TOPSIS法对其加以改进,通过相对熵排序法完成威胁评估。实例仿真验证了所提方法的有效性和适用性。     

基于组合赋权TOPSIS的海上目标威胁评估

提出一种基于融合主客观信息组合赋权逼近理想解(Technique for Order Preference by Similarity to an Ideal Solution, TOPSIS)的海上目标威胁评估模型。从目标的作战能力、活动情况和其他影响因素构建海上目标威胁评估指标体系;在层次分析法(Analytical Hierarchy Process, AHP)和熵权法的基础上运用线性加权组合法确定主客观综合指标权重;利用TOPSIS法计算各目标的正负理想解相对贴近度,获得目标的威胁度排序。通过仿真实例证明了所提海上目标威胁评估方法的有效性。     

基于TOPSIS法的弹道导弹动态航迹质量评估

导弹航迹质量的动态评估是选主站数据融合模式下反导预警态势生成的重要环节.根据各雷达对导弹目标在瞬时状态和一定时间段内的探测情况,构建了航迹质量评估指标体系,基于熵权法确定了各指标的客观权重,并将所得权重应用逼近理想解排序法(TOPSIS)进行排序,由此得出航迹质量的优劣.该方法解决了在没有真值信息比对下的实时航迹质量评...     

一种基于凸优化的装备能力指标权重赋值方法

针对装备能力评估中指标权重配置问题,提出了一种基于凸优化的指标权重赋值方法。首先,介绍了装备能力评估的指标体系设计原则及流程,并以机载雷达系统为例设计了其能力评估指标体系;然后基于极大熵准则,以最大化各指标权重的熵值总和作为目标函数,专家/历史经验知识等先验信息作为约束条件,构建指标权重配置凸优化模型,并利用凸优化工具箱求解指标权重;最后,通过案例分析验证该方法的有效性与合理性。     

面向认知通信防护的穿透式干扰效能评估方法

在认知通信对抗场景下,为了支撑“通信模块/参数与干扰的多维正交配置式通信防护”的实施,干扰效能需要具备模块级响应能力,提出一种穿透式干扰效能评估方法。首先,选取各信号处理模块的核心参数作为评估参量;然后,采用层次分析法和熵权法确定指标权重,通过专家权重分配解决了层次分析法中的协同问题,通过非均匀映射解决了熵权法中的权重分配问题;最后,通过博弈论权衡主客观权重,利用优劣解距离法判断干扰效能;并对Link16数据链的干扰效能进行评估实验,综合考虑了干扰类型、干扰频点个数、干扰时间和系统类型等多个方面。实验结果表明,穿透式干扰效能评估方法不仅可以直观展示评估结果与指标参数之间的关系,而且具有良好的干扰区分能力。     

信息不完备条件下基于IOWA-TOPSIS的辐射源威胁评估

针对信息不完备条件下的辐射源威胁评估问题,提出一种基于IOWA-TOPSIS的评估算法。首先,针对实际作战过程中易出现的敌方辐射源信息不完备情况,引入诱导有序加权平均(IOWA)空值估计算法,基于属性集的关联性预测缺失数据;然后,采用改进的基于指标相关性的指标权重确定(CRITIC)分析不同属性对评估过程的影响程度,客观分配权重;最后,通过逼近理想解排序(TOPSIS)算法度量不同辐射源威胁程度,并进行威胁等级排序。仿真实验结果表明,所提算法能有效实现辐射源威胁评估,相较于传统评估方法,结果更加客观、可靠。     

基于IVIF-VIKOR的雷达辐射源信号分选识别特征性能综合评价方法

为解决雷达辐射源信号分选识别特征评价不够客观和缺乏评价依据等问题,提出了一种基于区间模糊原理、模糊交叉熵和多准则折衷法的特征评价方法. 首先通过区间模糊原理建立信噪比分级评价模型,并基于汉明距离进行寻优得出信噪比权重;其次结合信噪比权重和区间直觉模糊加权平均算子将分级模型整合成群决策矩阵,使用熵最大化法计算属性权重;最后基于多准则折衷法框架,采取模糊交叉熵实现特征方案排序. 仿真实验结果表明,所提方法能够给出与实际仿真实验相一致的分选识别特征评价排序结果,并优于逼近理想点方法,验证了所提方法的可行性和有效性.     

基于灰色关联算法的雷达反隐身性能评估

雷达反隐身的性能评估对现代空防战争具有重要意义。在深入分析雷达反隐身技术及相关基础理论基础上建立了雷达反隐身性能指标体系,提出了采用基于自适应熵权的灰色关联算法来进行雷达反隐身性能评估,解决了评价权重模糊问题,并结合经典最小二乘法和拉格朗日函数建立了优化评估模型,最后通过算例分析给出了该算法模型的应用过程,分析结果表明该算法能有效实现对雷达反隐身性能的排序和优选。     

基于实码加速遗传算法改进TOPSIS法在房地产预警体系中的应用

采用实码加速遗传算法来解决传统TOPSIS 算法在方案评选过程中存在方案距离理想解与负理想解同样近及指标权重选取主观两个问题,方便地获得了兼具决策方法适应性和决策者偏好的指标综合权重。应用实例证明了该方法的可行性和有效性。     

基于遗传算法的ISAR运动补偿新算法

提出了基于遗传算法进行逆合成孔径雷达运动补偿的新算法.针对遗传算法解的收敛性问题,在遗传算法中采用了最优个体保存策略,使得解以概率1收敛于全局最优解;针对遗传算法运算量大的问题,提出了采用运动补偿后最小熵和最小距离作为适应度函数,由此形成2种称为GAMCE和GAMCD的ISAR运动补偿新算法.仿真数据和实测数据验证了所提新算法的有效性.     

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.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

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.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.