两种自旋弹头ISAR成像方案性能的比较分析

为了对弹头目标的逆合成孔径雷达(ISAR)成像方法提供较好的选择方案,结合自旋弹头目标的运动特性,首先对基于轨道运动旋转分量的ISAR成像和基于自旋运动的ISAR成像方法作了简单的介绍,然后对这两种成像方案的性能在成像积累时间、成像算法复杂度和相同信噪比下的成像质量三个方面作了比较分析。分析结果表明:同等条件下基于自旋运动的ISAR成像效果较好,实时性较强。     

Performance Assessment of Run-to-Run EWMA Controllers

An iterative method is developed to optimize a performance criterion for best achievable performance for discrete integral controllers used in run-to-run control. An analytical expression is derived so that a realistic assessment of the given integral controller is obtained. Using the theoretical equivalence of discrete integral and exponentially weighted moving average (EWMA) controllers, the method is then extended to performance assessment of EWMA controllers. A semiconductor manufacturing example is used to illustrate the utility of the method.     

On a More Accurate Assessment of Scaled Copper/Low-k Interconnects Performance

Interconnect RC delay, predominantly affected by the effective dielectric constant (k-value) and by the copper resistivity (rho_Cu), is an important performance metric for back-end-of-line (BEOL) process assessment. As process technology scales, interpretation of fundamental process-induced RC delay variations becomes a challenge as the relative importance of statistical process-induced fluctuations (variation of critical dimensions during plasma etching of low-k materials, line profiles, thickness nonuniformity, etc.) grows rapidly and begins to show. A more accurate interpretation of experimental data and prediction of future performance trends requires a more realistic assessment that accounts for such statistical fluctuations. In this paper, an inventory of the most common possible sources of statistical process-induced RC delay variations is made, parameterized, and subsequently used to generate a realistic 2-D interconnect model from which, R and C, and thereby RC delay, are computed. For both wire resistivity and RC, response surface models (RSM) are subsequently generated based on the results of a full factorial design-of-experiment analysis with these input parameters. Finally, based on the RSMs, an improved methodology of interconnect performance evaluation is proposed.     

论绩效评估中的全面质量管理

本文从案例分析角度入手,剖析了绩效考核中存在的问题,引出绩效考核中全面质量管理的概念,并且从全面的、全过程的、全员参与的、全方法的四全角度出发,论述了提高绩效管理的新思路.     

雷达信号处理机性能的模糊综合评判

将雷达信号处理机指标按层次分类，采用多级模糊综合评判的方法对其性能进行评判。提出了一种以测试数据为基础的针对每一个因素的单因素评判方法，并具体介绍了每一级评判的权值选取方法。以具体的雷达信号处理机为例，给出了进行多级模糊综合评判的详细过程。     

再流焊接设备性能评估方法

再流焊接工艺是电子组装三大工序之一,其工艺的精确性直接决定了产品焊接质量。但由于再流焊接工艺的不可视化,使其成为工艺控制的难点。参考IPC-9853标准可对再流焊设备及工艺进行科学的量化评估,使其透明可视化,有助于工艺优化及控制。     

一种互操作协议性能评估方法

在异构网络环境下。互操作协议对应用系统具有重要意义，互操作协议的性能对应用系统的性能也起着举足轻重的作用．为确定应用系统性能瓶颈，必须评估互操作协议性能．本文提出了一种互操作协议性能评估方法．该方法针对实际应用系统中的互操作协议，提出符合实际的评估指标，对协议性能进行定性分析和定量分析．在定性分析中得出安全性、容错能力、可扩展性等性能指标．在定量分析中，建立仿真实验模型与排队论数学模型相结合的混合模型。得出网络带宽占用、响应时间与吞吐量等性能指标．综合这些指标，我们给出互操作协议性能评估的结果．     

基于加速性能退化试验的板级可靠性评估

传统的可靠性评估方法一般基于失效寿命数据,而目前对于高可靠长寿命的电子产品,很难通过加速试验获得其失效寿命时间。为解决这一矛盾,将性能退化理论引入到传统可靠性评估中,提出了基于失效数据及加速性能退化的可靠性评估的新方法。应用某型雷达24V/2A稳压电源板加速性能退化试验进行验证,结果表明该方法用于高可靠长寿命电子装备的可靠性评估是正确有效的。     

Performance Assessment of Band-Limited Limiting and Blanking Communication Systems

This paper presents a general formulation of piecewise linear (PWL) models of voltage transfer functions to characterize channel nonlinearities in satellite digital communication systems. This formulation provides a tractable approach to evaluate the performance of such systems with band-limited PWL limiters, channel blanking, and hardlimiters. The envelope characteristics of the PWL models are derived in terms of breakpoints and slopes of PWL segments. Intermodulation (IM) products, their statistical properties, and the resultant error probability performance of such BPSK systems, subject to CW interference, are numerically illustrated through these PWL models.     

Fuzzy Multi-State Systems: General Definitions, and Performance Assessment

Compared with a binary system model, a multi-state system model provides a more flexible tool for representing engineering systems in real life. In conventional multi-state theory, it is assumed that the exact probability and performance level of each component state are given. However, it may be difficult to obtain sufficient data to estimate the precise values of these probabilities and performance levels in many highly reliable modern engineering systems. New techniques are needed to solve these fundamental problems. A general fuzzy multi-state system model is proposed in this article to overcome these deficiencies. The basic definitions and assumptions of such systems are introduced. The concepts of relevancy, coherency, and equivalence are used to characterize the properties of such systems. Future research directions include performance evaluation algorithms for the defined fuzzy multi-state systems.      

Performance Monitoring and Assessment of Embedded HW/SW Systems

Performance assessment of embedded HW/SW systems built with various types of VLSI components, i.e. heterogeneous multi-processor architectures, is important to help the development of complex real-time applications. To design such a tool, two issues must be solved: the gathering of relevant information simultaneously on several components without disturbing the application behavior, display of the performance results in a way that can be easily interpreted by designers. This paper presents a significant solution for the two above issues. We first describe what the goal for designers is and what kind of applications are concerned. Then we describe the principle of collecting an event trace and the technique to evaluate the selected performance indexes. The monitoring technique, based on a specific ASIC, is non-intrusive and allows our tool to capture real-time event occurrences from software tasks, and even from hardware functions implemented in ASICs. Each event is automatically time-stamped, collected and processed in real-time to evaluate the performance indexes selected by the designer. We also describe the display tool which clearly shows the results to the designer according to different representations. This technique and the associate real-time performance analyzer are integrated in a complete development process based on the MCSE methodology.     

基于TD的3G无线网性能测试评估体系

结合国家重要专项测试项目对网络的评估要求,从TD-SCDMA网络评估内容与测试方法出发,详细介绍了TD-SCDMA网络所需要评估的内容,以及评估指标的定义。最后,对TD-SCDMA网络指标的量化评估进行了研究分析,结合网络和项目实际情况,选取了若干个关键网络指标,通过加权平均的方法建立网络评估模型。     

基于仿真计算的飞行器雷达隐身性能评估

从飞行器雷达散射截面的计算机仿真出发,对运动飞行器的RCS动态特性和复杂电磁环境下的隐身性能进行研究.基于运动目标姿态参数的转换原理,得到运动目标的动态RCS特性,通过相对计算方法计算雷达的瞬时探测概率,并给出有源和无源干扰条件下探测概率的计算方法;以单部雷达的目标检测准则为基础,给出了雷达组网模式下的综合检测准则;考...     

火电机组蒸汽温度控制系统性能评估

蒸汽温度控制对提高电厂功率机组的效率、延长使用寿命有着重要作用。为了保持蒸汽温度回路控制性能,传统方法使用最小方差法,但其难以得到控制系统的延时。在实际应用中通常使用扩展时域法来代替最小方差评估方法。例如在湛江300~660 MW火电机组蒸汽温度控制回路中采用了扩展时域法,评估出改进控制策略前后系统的控制性能提升了7.8%。湛江电厂回路评估结果表明,扩展时域法可较好地评估火电机组蒸汽温度控制回路的性能。     

测量LED用高精度光度探头及其性能评价

测量LED用高精度光度探头是准确测量和评价LED品质的关键基础测光部件，其性能好坏将直接影响测量和评价结果。文章详细介绍测量LED用高精度光度探头的国内外近况、和其主要性能参数测试方法．并介绍了作者在测量LED用高精度光度探头研究方面的最新进展，讨论了国际最新关于专用于各种LED光源测试的光度探头的评价方法，同时提出了作者的评价公式。     

电子战在线效能评估中评估素材的时效性

电子战在线效能评估利用电子战平台产生的各类数据作为评估素材,完成各项评估指标计算.评估素材时效性对评估结果有着显著的影响,随着时间的推移,评估素材与实时战况的匹配性也不断降低.基于电子战在线效能评估架构建立了评估素材时效性模型,提出了一种时效性量化方法以及三种评判评估素材处理机制的指标,并且给出了基于上述评判指标的最优时效性评判方法,最后通过仿真对上述方法的性能进行测试以及结果分析.     

基于802.11协议的无线Mesh网络搭建与性能测试

建立一个以802.11协议为基础的无线Mesh试验网络在实际应用环境中评价无线Mesh网络的性能[1]。试验网包含Mesh路由器和Mesh客户端两部分。Mesh路由器是基于MIPS构架的嵌入式linux硬件开发板为核心做成;Mesh客户端则是由基于x-86体系的笔记本充当的。通过测试网络中源节点和目的节点的传输速率＂带宽＂来评价Mesh网络的性能,并且通过实时的视频传输来评价网络的稳定性和鲁棒性。     

PCB制造业员工绩效考核体系探析

如何开发人力资源,同样是摆在PCB制造业经营管理者面前的战略问题。文章通过探讨企业员工绩效考核的作用、员工绩效考核中的常见问题以及建立PCB制造业员工绩效考核体系的方法,来阐述如何利用对员工绩效实施科学管理这一工具,不断激励员工,达到育才、用才、留才的目的,最终支持企业实现可持续发展。     

全球信息栅格中的性能评估体系结构研究

GIG性能评估体系结构主要应用在战术级网络和信息融合两方面.首先,利用GIG技术对端对端端口的应用和服务性能进行评估.其次,通过建立战术级实例来定义GIG作战想定环境,并且通过假设的模型来预测端与端性能的优劣.最后,应用性能评估工具对GIG性能进行快速的评估和参数分析.该系统的研究对我军信息化建设具有重大意义.     

液晶电视显示器基本性能评价要素探讨

根据液晶电视显示器的发展现状及CRT电视显示器和液晶电视显示器的成像原理及基本特性,提出能反映液晶电视显示器基本性能的评价要素.