基于DSGA的航空作战平台作战联盟形成策略

作战联盟是一种适应分布式网络化作战的重要作战样式。以航空作战平台执行突击作战任务为背景,分析任务资源能力需求与作战平台能力属性匹配特点,建立航空作战平台作战联盟形成问题的数学模型。针对模型特点,采用一种双串编码遗传算法(DSGA)对模型进行求解,并制定部分匹配交叉策略、均匀变异策略以及混合选择算子。案例实验结果表明,算法能够有效解决问题模型,且具有较好的可靠性和时效性。     

考虑温度影响的高灵敏度微压力传感器

提出了一种考虑温度影响的基于光子晶体的微压力传感器,传感器由微压力传感和温度传感两部分构成,其中微压力传感部分测量的是所处温度环境下的压力值.两部分传感器均利用波导和腔的耦合实现带阻滤波功能,根据带阻滤波器的模式在所处温度下线性红移,分别计算相应的温度值和该温度下的压力值,并通过热光效应和热膨胀效应计算出温度对器件材料折射率的影响,从而得到真实的微压力.文中对结构参数进行了优化设计,实现了1.33 nm/μN的微压力灵敏度.     

基于模糊因果图的故障诊断

因果图理论是一种基于概率论的不确定推理模型,能够进行在线动态推理和对复杂系统进行故障诊断,但在因果图模型中,要求事件的发生概率为精确值.针对实际情况事件发生概率具有模糊性和不确定性的特点,文章将模糊数引入因果图中,解决了获取事件发生概率精确值的难度,又使因果图能处理带模糊性和不确定性的问题.实例表明,该方法不但比故障树分析(FTA)更有效,而且能进行故障树分析不能进行的诊断推理和辩解推理.     

连续因果图的推理及参数学习

因果图理论是利用图形化和直接因果强度来表达知识和因果关系的一种基于概率论的推理方法，而对于连续的因果图连接事件的概率密度函数（或可能性密度函数）是连续因果图能进行推理的关键，一般都是假定它们可由领域专家给出。这在实际中很难办到。文章首先给出了连续因果图的推理过程，然后讨论了如何利用已知数据集。在因果图结构已知的条件下利用参数、非参数、半参数化方法估计出连接事件的概率密度函数的途径。     

基于轻型机步野战场景的DTN通信策略设计与性能分析

通过对基于轻型机步野战场景的DTN通信策略的研究,提出了一种新的DTN通信策略,根据排队论G/G/1模型和切比雪夫不等式对提出的DTN通信策略进行了建模和关键参数的理论值推算,利用ONES架构对轻机步DTN场景进行了仿真实验,将得到的实验数据与预期值进行对比和分析,验证了通信策略的正确性,确定了影响系统传输效率的关键因素,并在相同仿真场景下与感染路由策略做了性能比较。     

CtoG国际漫游网络优选研究

网络优选技术越来越广泛地应用在国际漫游服务之中,可在不明显降低服务质量的前提下,控制漫游用户优先接入到合作伙伴的网络中。分析了网络优选技术的2种主要实现思路,列举了采用SS7方式时CtoG网络优选平台的实现方式及部分干扰策略,并对网络优选功能使用后的不利影响进行了探讨,提出了CtoG网络优选功能的开通建议。     

天线与天线罩的矩量法严格建模分析

传统计算天线罩对天线性能的影响,是基于天线的辐射场已知的条件下进行的。这样的计算没有考虑天线罩对天线本身电流分布的影响,尤其当天线罩位于天线近场区域的时候,这样的建模方式将带来严重的误差。利用等效原理和矩量法(MoM)对天线和天线罩进行了严格建模,并研究了天线罩对天线电流及辐射特性的影响。数值计算结果与相关参考文献的结果吻合良好。     

CtoG国际漫游网络优选研究

网络优选技术越来越广泛地应用在国际漫游服务之中，可在不明显降低服务质量的前提下，控制漫游用户优先接入到合作伙伴的网络中。分析了网络优选技术的2种主要实现思路，列举了采用SS7方式时CtoG网络优选平台的实现方式及部分干扰策略，并对网络优选功能使用后的不利影响进行了探讨，提出了CtoG网络优选功能的开通建议。     

一种无线传感器网络中目标跟踪的自适应节点调度算法

在无线传感器网络目标跟踪的过程中进行节点调度,可以综合考虑跟踪误差和能量消耗,延长传感器网络的使用寿命。为了综合考虑节点调度的短期和长远损失,该文将问题建模为部分可观测马尔科夫决策过程(POMDP)以得到更优的调度策略,并提出一种近似求解算法C-QMDP。该算法利用马尔科夫链蒙特卡洛方法(MCMC)推导连续状态空间的置信状态的转移,并计算瞬时代价。使用状态离散化方法,基于马尔科夫决策过程(MDP)值迭代求解未来代价的近似值。仿真结果表明,相比现有POMDP近似算法,该文算法既可以降低跟踪过程中的累积损失,又可以将大量运算进行离线计算,减小了在线决策时的计算量。     

一种基于奖励机制的agent联盟形成策略

 为了解决多智能体系统中agent在形成联盟的时候不能同时保持系统全局优化解和联盟的稳定性问题,提出了一种联盟形成时的奖励策略,对于在联盟中执行任务的agent给以适当奖励,从而使得联盟在达到全局最优化解的同时保持稳定.在实验中,以Postman问题作为例子,对三种联盟形成策略即Shapley值策略、均分策略和奖励策略进行了比较.数据表明Shapley值策略和均分策略的时效性差,并且不能保证联盟的稳定性.相反,奖励策略是最有效的,它可以使得联盟达到全局优化解的同时保持稳定,并且时效性好.最后对奖励策略进行了性能分析,从理论上证明了奖励策略的优越性.     

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.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

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.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

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.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

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.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.