基于改进ADC模型的系留升空中继通信系统作战效能评估

科学评估系统和装备的作战效能，对合理使用系统和装备、充分发挥系统和装备作战能力有着重要的实践意义和指导作用。文章分析系留升空中继通信系统作战效能的影响因素，构建包括可用性、可信性、信息通信保障能力和战场环境因子在内的改进ADC评估模型，最后通过实例评估验证改进ADC模型的可行性。评估结果表明，通过增加战场环境因子，系留升空中继通信系统作战效能评估更加贴近实战。     

舰载导航装备综合效能评估指标体系的研究

确定合理的效能评估指标体系是对装备实现科学评估的关键环节。借鉴ADC模型,对舰载导航装备的可用性、可信性、导航能力的含义以及影响因素进行了深入的探讨与分析,并结合舰载武器装备作战对导航信息的需求,对基本ADC模型进行了适当的修正,从而建立了舰载导航装备综合效能评估指标体系。该指标体系较为客观地反映了舰载导航装备的综合效能,为进一步评估其效能并找到提高效能的措施提供了必要的依据。     

运用层次分析法进行通信系统效能评估

军事通信装备是现代化战争的重要保障手段,其作战效能直接影响到作战效果。结合某通信系统的使用背景和特点,在分析效能评估方法的基础上,建立了效能评估体系,并对该通信系统的效能评估过程进行了描述,对类似系统的效能评估具有一定的指导作用。     

一种陆基通信支援侦察系统效能的评估模型

根据通信支援侦察系统构成和主要功能，建立了由系统侦察能力、机动能力、生存能力、可用性及可信性构成的评估指标体系，提出了由指标的重要性和信息量共同确定指标权重的方法，并采用效用函数对各性能指标进行量化，最后给出了系统效能评估模型。     

反舰导弹武器系统效能评估

基于反舰导弹特点,根据ADC模型对系统效能的可用性、可信性和系统能力进行了分析,建立了反舰导弹系统效能评估数学模型,对于反舰导弹作战效能提高有一定指导意义。     

后续备件供应对系统瞬时可用性的影响研究

系统可用性是用来衡量装备效能的主要指标之一。在装备系统的使用过程中,系统可用性随着时间的变化而变化,其中备件供应策略对于系统可用性有着重要的影响。研究了系统的瞬时可用度随时间的变化情况,利用马尔科夫理论推导了瞬时可用度模型,并用仿真手段对数学进行了验证,可以为系统的可用性评估及研究备件的优化配置提供一种新思路。     

基于扩展AHP的电子战仿真效能评估

基于层次分析法（AHP）技术的电子战效能评估系统能很好的针对装备系统的层次性对装备效能做出科学的评价,以电子战仿真效能评估系统为背景,分析了电子战仿真效能评估模型,建立了电子战效能评估的层次模型,同时对层次分析法予以改进,提出扩展的层次分析法,并运用于模型中,根据此模型可得出电子战装备单项作战效能评估结果﹑电子战装备系统作战效能评估结果,为装备计划﹑论证以及作战运用研究提供了有利的参考。王维锋,赵五洲,孙岩     

双通道空面反辐射导弹武器系统效能评估

本文分析推导了双通道空面反辐射导弹武器系统可用性、可信性、系统能力和效能计算公式。讨论了雷达对抗对武器系统效能的影响。     

机载箔条弹投放系统作战效能评估

以美国工业武器系统效能咨询委员会提出的ADC模型为基础,构建了机载箔条弹投放系统作战效能评估的指标体系和评估模型。主要分析其可用度、可信度和能力矩阵的影响因素并建立了计算模型。以某型机载箔条弹投放系统为例,对模型中各有关参数进行了初定,使效能分析的结果更接近实际;并为该机载箔条弹投放系统提供了改进方案,对其作战效能进行了评估,作战效能得到了提升。该模型可为部队训练和作战提供系统的战斗效能数据,找出影响系统作战能力的敏感因素,为装备使用、改进和发展新型装备提供了依据。     

动态平均值法评估航空装备一线维修保障效能

为了提高航空装备一线维修保障的效率,对其特点进行了深入的分析.应用动态平均值法建立了系统效能评价模型,以完好飞机数、外场维修飞机数和中修飞机数作为效能评估指标.引用算例,对比分析了送修飞机需要等待与不需要等待两种情况的效能,并讨论了主要参数对结果的影响.最后可以得到改善一线维修保障工作的具体途径.     

具有新型电子传输层的有机薄膜电致发光器件

将8-hydroxy-quinolinato lithium(Liq)掺入4'7-diphyenyl-1,10-phenanthroline(BPhen)作为n型电子传输层(ETL),将tetrafluro-tetracyano-quinodimethane(F4-TCNQ)掺入4,4',4"-tris(3-methylphenylphenylamono)triphenylamine(m-MTDATA)作为p型空穴传输层(HTL),制作了p-i-n结构有机电致发光器件.为了检验传输层传导率的改善情况,制备了一系列单一空穴器件和单一电子器件.在引入BPhen:33wt% Liq作为ETL后,x% F4-TCNQ:m-MTDATA作为HTL后,器件的电流和功率效率明显改善.与控制器件(未掺杂)相比,性能最佳的掺杂器件的电流及功率效率分别提高了51%和89%,电压下降了29%.这是由于传输层传导能力的提高使得载流子在发光区域达到有效平衡.     

具有新型电子传输层的有机薄膜电致发光器件

将8-hydroxy-quinolinato lithium(Liq)掺入4'7-diphyenyl-1,10-phenanthroline(BPhen)作为n型电子传输层(ETL),将tetrafluro-tetracyano-quinodimethane(F4-TCNQ)掺入4,4',4"-tris(3-methylphenylphenylamono)triphenylamine(m-MTDATA)作为p型空穴传输层(HTL),制作了p-i-n结构有机电致发光器件.为了检验传输层传导率的改善情况,制备了一系列单一空穴器件和单一电子器件.在引入BPhen:33wt% Liq作为ETL后,x% F4-TCNQ:m-MTDATA作为HTL后,器件的电流和功率效率明显改善.与控制器件(未掺杂)相比,性能最佳的掺杂器件的电流及功率效率分别提高了51%和89%,电压下降了29%.这是由于传输层传导能力的提高使得载流子在发光区域达到有效平衡.     

Efficient coding of shape and transparency for video objects.

A novel scheme for coding gray-level alpha planes in object-based video is presented. Gray-level alpha planes convey the shape and the transparency information, which are required for smooth composition of video objects. The algorithm proposed is based on the segmentation of the alpha plane in three layers: binary shape layer, opaque layer, and intermediate layer. Thus, the latter two layers replace the single transparency layer of MPEG-4 Part 2. Different encoding schemes are specifically designed for each layer, utilizing cross-layer correlations to reduce the bit rate. First, the binary shape layer is processed by a novel video shape coder. In intra mode, the DSLSC binary image coder presented in [3] is used. This is extended here with an intermode utilizing temporal redundancies in shape image sequences. Then the opaque layer is compressed by a newly designed scheme which models the strong correlation with the binary shape layer by morphological erosion operations. Finally, three solutions are proposed for coding the intermediate layer. The knowledge of the two previously encoded layers is utilized in order to increase compression efficiency. Experimental results are reported demonstrating that the proposed techniques provide substantial bit rate savings coding shape and transparency when compared to the tools adopted in MPEG-4 Part 2.     

A study of the influence of inter-metal dielectrics on electromigration performance

The relative electromigration performance of test structures with a common Ti/TiN-Al-1% Cu-TiN metallization scheme and with three different inter-metal-dielectric (IMD) layers is compared. Differences in lifetimes are observed which are attributable to the influences of the different IMD layers. The IMD layers in question are (a) polyimide, (b) a flexible inorganic dielectric layer, and (c) a rigid inorganic dielectric layer. A matrix of conventional electromigration tests has been carried out. The possible influence of stress migration is investigated and an explanation for the relative behaviour is proposed.     

A simple analytical model of thin films crystalline silicon solar cell with quasi-monocrystalline porous silicon at the backside

An analytical model that simulates the performance of an elementary thin silicon solar cell with a thin film quasi-monocrystalline porous silicon (QMPS) at the backside reflector is developed. A complete set of equations for the photocurrent generated under the effect of the reflected light is solved analytically in each region. The collection of the light absorbed by the QMPS layer has been discussed and the analytical solution of the light-generated current in this layer is derived. The maximum of the photocurrent density calculated in the present study is in accordance with the numerical values established by Bergmann et al. Furthermore, the influence that the layer's number of double porosities and high porosity have on the photovoltaic parameters is studied. It is demonstrated that the photovoltaic parameters increase with the number of double porosities that the layer might have in a given structure. When the QMPS layer is formed by three double-porosity layers 20%/80% and for a 5-μm-thick film c-Si, the backside reflector gives a total improvement of about 6 mA/cm² for the photocurrent density and 3.2% for the cell efficiency.     

电离效应对EBCMOS中电子倍增层增益的影响研究

采用蒙特卡罗模拟方法研究了电子轰击互补金属氧化物半导体(EBCMOS)成像器件中高能电子轰击半导体时产生的电离效应对电荷收集效率和电子倍增层增益的影响。分析了入射电子能量、p型衬底层掺杂浓度、电子倍增层和钝化层厚度对电荷收集效率和增益的影响。结果表明,增加入射电子能量(小于4 keV)、减小电子倍增层和钝化层厚度、降低掺杂浓度等是提高电荷收集效率和电子倍增层增益的有利途径,可为获得高增益的EBCMOS器件提供理论支撑。     

基于Firpic发光的高效率蓝色有机发光器件

为了充分利用发光层中主客体间的能量转移和空穴阻挡层（HBL）的空穴阻挡作用,制作了结构为ITO/m-MTDATA（25 nm）/NPB（15 nm）/Ir（ppz）3（10 nm）/Simcp：Firpic（30 nm,6%）/HBL（35 nm）/LiF（1 nm）/Al（200 nm）的高效率蓝光器件,研究了3种类...     

Layered motion estimation

A layered motion estimation algorithm is proposed that permits quasisimultaneous motion estimation/segmentation up to a fixed maximum number of layers. The estimation results in one motion parameter set per layer, and a segmentation map that assigns these sets to different parts of the image (motion layers). Motion in a layer is modelled with at maximum four parameters capable of describing pan, tilt and zoom. The concept shows some hierarchy, i.e. a ranking of the motion layers. In this way the motion parameter estimation concerning one layer excludes those parts of the image that have been described by a layer ranked higher in the hierarchy and are not polluted by parts of the image that are better described by layers ranked lower in the hierarchy. The concept results in a very low operations count. It has been shown to perform well even in critical scan rate conversion applications, particularly in picture rate up-conversion. A variant including three layers has been scheduled to run in real-time on a Philips TriMedia processor.     

不同旋涂速率对聚合物太阳电池性能的影响

以聚3己基噻吩(P3HT)和[6,6]-phenyl-C61-butyric acid methyl ester(PCBM)为活性层材料制成聚合物太阳电池,通过控制活性层旋涂速率控制活性层厚度。从不同活性层厚度器件的吸收光谱、原子力及器件各项性能参数详细分析了不同活性层旋涂速率对太阳电池性能的影响。结果表明:旋涂速率为1 000 r/min时,电池具有最佳性能,光电转换效率最高为1.54%。     

Precipitation of arsenic in doped GaAs

Precipitation processes in the p-type, n-type, and intrinsic GaAs layers grown by molecular beam epitaxy at a low temperature were studied by transmission electron microscopy. The average spacing, average diameter, and volume fraction of precipitates were measured as a function of the annealing time for the annealing temperature of 700°C. Volume fractions of precipitates are nearly constant in each layer over the period of annealing, implying that the precipitation process has reached the coarsening stage in the annealing times used in the study. The volume fraction of precipitates in the n-type layer is about a half of those in the p-type and intrinsic layers, suggesting that the incorporation rate of excess As into the n-type layer during the growth is lower than those into the p-type and intrinsic layers. Despite a large difference of amounts of excess As in as-grown n-type, p-type, and intrinsic layers, the average spacings and, hence, number densities of precipitates in three layers are nearly identical for each of the annealing conditions.