一种8mm本振源的设计

介绍一种８ｍｍ本振源的设计方案,并给出研制结果,１ｋＨｚ处的相位噪声达到了－９２ｄＢｃ／Ｈｚ,杂散优于－６０ｄＢｃ;还具有体积小、重量轻等特点。     

雷达频率合成器比较研究

介绍了雷达用频率合成器的三种设计方案，给出了理论分析与实验结果。     

某型接收机中频电路的改进设计

本文介绍了某型机载接收机中频自检电路以及第一、第二本振电路的改进设计方案, 弥补了目前中频电路的缺陷,提高了电路的稳定性。     

L波段射频幅相检测电路的设计

介绍了幅度和相位检测的工作原理，给出了一种单片式L波段幅度及相位检测电路的设计方案，与传统的设计方法相比，单片式L波段幅度及相位检测电路具有体积小等特点。最后给出了测试结果，结果表明射频幅度相位检测电路的设计性能优越、可靠性高。     

用于捷变频雷达的频率合成器的设计

介绍一种X波段频率合成器的设计方案，此方案将直接式和数字锁相相结合，完成快速捷变功能。并对其进行了分析、讨论，最后给出研制结果。     

双电调微波固态源的设计与研制

本文介绍一种双电调S频段微波固态源的设计方案及其主要技术指标。该微波固态源具有参考频率低、取样次数高、可多工作频率输出、频率间隔小、频率稳定度高、频谱纯净、输出功率大及使用操作方便等特点。最后文中给出了主要测试结果。     

用DDS实现快速跳频频综

本文介绍了跳频频率合成器的一种先进的设计方案，它综合了ＤＤＳ与ＰＬＬ的技术，可制成低相噪、小步进、低杂散、快速跳频的频率合成器，在电子对抗与侦收及商用通信等方面有广泛应用。     

Ka波段频率合成器

本文介绍了一种基于毫米波谐波混频、中频锁相的Ｋａ波段频率合成器的设计方案及实现结果。合成器的频率范围为２６．５￣４０ＧＨｚ,输出功率大于＋５ｄＢｍ,频率步进值为１ＭＨｚ,相噪指标为（１０ｋＨｚ）〈－６５ｄＢｃ／Ｈｚ,杂散低于－５５ｄＢｃ。     

基于YIG振荡器实现的X波段频率合成器

本文介绍了一种YIG(Yttrium Iron Garnet)振荡器的X波段频率合成器的设计方案，实验结果表明，该合成器性能稳定可靠。     

双环路集成锁相频率合成器MB15U36的原理与应用

介绍日本富士通(Fujitsu)公司生产的MB15U36双环集成锁相环频率合成器的内部结构及原理，深入研究其结构特点，并在此基础上给出一个基于MB15U36的频率合成器设计方案。设计的环路滤波器可较好地满足工程设计中对相位噪声的要求．     

A composite model of product development effectiveness: application to services

This paper explores the extent to which an enlarged, generic version of a "composite" model of concurrent product development previously tested for goods industries also applies to services. The model is comprised of four types of building blocks commonly used in theories of organization design. The operating core of the model includes a troika of practice sets dealing with the organization of cross-functional teams, discipline by structured development processes, and the use of enabling tools/technologies. Concurrent strategy focuses core operations on fast, reiterative cycles of product development. The model postulates that synergy among its constructs have an impact on product development effectiveness. This postulate is tested by multiple regression analysis of 62 large service enterprises in the New York area. All four components of the model had main effects on performance measured as time compression and cost reduction in product development, signature indicators of the effectiveness of concurrent methods of product development. Interaction effects were observed among the constructs of strategy, organization, and process, which suggest synergies. However, tools/technologies lacked significant interactions. With this exception, the results for services parallel those of other studies of goods industries. These findings suggest that concurrent methods of product development are robust, as well as reliable. A generic model of product development is important for managing innovation because goods and services are increasingly commingled in many enterprises and sold as a bundle. Thus, the four building blocks of the model are important for managers to consider deploying in synergistic ways to speed time to market and achieve cost efficiencies.     

Effects of concurrent engineering on make-to-order products

An increasing number of manufacturing organizations are using concurrent engineering product development processes, which rely on parallel scheduling of activities throughout the product development cycle. This study examines the impact of such practices on product development time, product quality, and delivery leadtime. Using data obtained from structured interviews with product managers and engineers, six hypotheses are tested using a sample of 31 make-to-order (MTO) products from several industries. The results suggest that concurrent engineering may he appropriate for incremental innovation, but may have some “hidden costs” in the form of increased defects when applied to new “breakthrough” innovations. However, this strategy may be entirely suited to a specific customer segment that is willing to work with the manufacturer on debugging the product in the field. The study points out the importance of considering the hidden costs of concurrent engineering, and discusses the strategic implications of such decisions for technology managers     

基于固定模糊度技术的精密单点定位性能分析

模糊度固定是影响精密单点定位精度和快速收敛的主要问题之一,而相位偏差的有效分离是模糊度固定的关键因素,采用包含相位偏差的钟差和与之耦合的轨道来完成模糊度的固定,基于全球分布的5个IGS连续跟踪站5 d的观测数据,采用采样间隔为30 s的高精度精密钟差产品,研究精密单点定位(PPP)的整周模糊度在固定解模式和浮点解模式下的定位精度,并对这2种模式的定位结果进行比较试验。验证结果表明,模糊度固定模式下,定位精度在X,Y两个方向的RMS平均提高59%,38%,Z方向的提升幅度相比X,Y两个方向较小,为13%,且固定模式下模糊度的固定率都在95%以上。     

Distance based kernels for video tensors on product of Riemannian matrix manifolds

In this paper, we explore the inherent geometry of video tensors by modeling them as points in product of Riemannian matrix manifolds. A video tensor is decomposed into three modes (factors) using matrix unfolding operation and each mode is represented as a point in a product space of Grassmannian and symmetric positive definite (SPD) matrix manifold. Hence a video is represented as a point in the Cartesian product of three such product spaces. Being a manifold valued (non-Euclidean) representation, application of several state-of-the-art Euclidean machine learning algorithms lead to inferior results. To overcome this, we propose positive definite kernels which map the points from product manifold space to Hilbert space. The proposed kernel functions implicitly make use of geodesic distance on product manifold to obtain a similarity measure and generate a kernel-gram matrix. In addition, we generate a discriminative feature representation for each manifold valued point using kernel-gram matrix diagonalization. Classification is performed in a sparse framework. The proposed methodology is tested over three publicly available datasets for hand gesture, traffic signal and sign language recognition. Experimentation performed over these datasets show that the proposed methodology is powerful in terms of classification accuracy in comparison with the state-of-the-art methods.     

理解测试实质,应对EN55020要求

本文从产品设计的角度介绍了EN55020:2002的测试实质,阐述了该标准的测试中被测设备受干扰的原理,并分析了如何在设计中采取有效的应对措施,使设计出的机器满足标准要求.     

Evaluating Different Strategies for Testing Software Product Lines

The Software Product Line (SPL) approach is associated with many benefits, and with some challenges too. In the SPL testing, a great challenge is the integration of test methods and techniques with the SPL engineering. To do this, some strategies have been proposed, however, they have not been properly evaluated and compared. In this paper a case study is described comparing three different test strategies: the product by product strategy that tests each product individually; an incremental strategy that tests the products reusing test cases from products previously tested; and a strategy that instantiates test data derived in the domain engineering, considering SPL commonalities and variabilities. In the study an SPL from the games domain was used, and the test data were generated from use cases. The results show that SPL oriented strategies are associated to greater percentages of reuse, and consequently, with lower effort to write test cases.     

Boundary scan based interconnect testing design for silicon interposer in 2.5D ICs

Interposer-based 2.5-dimensional integrated circuit (2.5D IC) is considered as a promising solution to problems like wire delay and power consumption faced by the semiconductor industry today. Since the interconnect wires in the silicon interposer may be defective during fabrication and assembly, they must be adequately tested to ensure product qualification. This paper presents an efficient interconnect test architecture to detect open, short and delay faults, which is compatible with the IEEE 1149.1 standard. It provides a new boundary scan structure with low test power consumption. To reduce the overall test cost, a data-package based test structure is proposed to match the test data transfer volume between TSVs and scan chains. Interconnects of multiple dies can be tested simultaneously under constrains of test power with minimum external test pins. The simulation results validate the effectiveness of the proposed test method. We also present synthesis results to evaluate the area overhead.     

基于Turbo乘积码的MIMO-OFDM系统在IMT2000信道下的性能研究

为了提高无线通信系统的可靠性,采用极具纠错性能的Turbo乘积码与空时分组码级联,构成Turbo乘积码编码的MIMO-OFDM系统。测试了采用三种Turbo乘积码的两发两收MIMO-OFDM系统在通过IMT2000信道后的性能。仿真结果表明采用Turbo乘积码后的MIMO-OFDM系统性能有明显改善。     

Composite forms of organization as a strategy for concurrentengineering effectiveness

This paper proposes a “composite” form of organization as best for reducing product development time and costs. This composite is a meld of three sets of concurrent engineering (CE) practices: early simultaneous influence (ESI) in product design decisions by multiple functions, in-process design controls (IDC), and computer and information technology (CIT). The importance of these practices was suggested by case studies of CE practices in 12 major US companies. The separate and interaction effects of each of these three practices is tested statistically using data from a survey sample of 74 companies. The results show statistically significant interaction effects among the three core CE practice sets. This suggests synergistic benefits from simultaneously achieving high levels of these three practices     

基于LabVIEW平台的电子设备测试系统的研究与开发

开发一项武器装备的自动测试系统要经过该电子装备的摸透分析、所需激励信号和测试信号的分析、市场配套硬件产品的采购和调理电路的设计,然后进入软件设计阶段,最后软硬件和设备总体联调。在此介绍了基于LabVIEW平台的电子设备自动检测系统的设计和实现,利用LabVIEW程序对测试数据进行分析处理。