大规模定制环境下 ERP 的发展

ERP─EnterpriseResourcePlanning企业资源计划系统 ,是指建立在信息技术基础上 ,以系统化的管理思想 ,为现代企业决策层及员工提供决策运行手段的管理平台。从竞争环境的角度出发 ,提出了大规模定制已经逐渐成熟并最终取代大规模生产成为新的生产经营模式的观点 ,同时 ,分析了在大规模定制下传统ERP的局限 ,从管理和技术的角度探讨新一代ERP的特点及发展。     

基于单片机控制的实验线路故障诊断系统

介绍了基于单片机控制技术的强电实验线路故障自动诊断系统的结构及功能,阐述了系统硬件设计、软件设计的基本原理．     

多路FM－SCM光波系统研制

介绍我们研制的多路ＦＭ－ＳＣＭ（调频副载波复用）光波系统及其性能，讨论了ＳＣＭ光波系统的噪声。该系统主要可用于多路ＣＡＴＶ光纤传输。采用Ｆ－Ｐ腔ＬＤ和ＰＩＮ－ＦＥＴ接收组件，通过系统优化，实现了接收端输出电视图象信号ＳＮＲ＞５５ｄＢ。     

Influence of SMA content on the electro-optical properties of polymer-dispersed liquid crystal prepared by monodisperse poly(MMA-co-SMA)/LC microcapsules

Monodisperse poly(methyl methacrylate) (PMMA) particles containing various concentrations of stearyl methacrylate (SMA) were prepared, and a liquid crystal (LC) was swollen into the particles using a solute co-diffusion method (SCM). Phase separation behaviors between the polymer and LC were monitored by utilizing an optical and a polarized microscope (OM/POM). The monodisperse LC microcapsules were then applied to a polymer-dispersed liquid crystal (PDLC), and the electro-optical properties were investigated. As a result, the threshold and driving voltages were improved when the SMA content increased. The long alkyl chains of SMA in the capsules should exist at the interface of the LC and polymer resulting in an enhancement of phase separation between the polymer and LC, which largely influences the electro-optical properties of PDLC.     

MPOF切割机温度控制系统的设计

微结构聚合物光纤(MPOF)是一种新型的聚合物光纤,其主要特征是在包层中有形状、大小、排列不同的空气孔.因为材料的特性,聚合物光纤的切割以及端面处理要比石英光纤复杂得多,尤其对于具有微结构的聚合物光纤更是如此.影响光纤切割质量的因素很多,其中切割时切割机的温度是决定光纤切割质量的关键.因此,设计了一种以单片机作为核心部件的切割机温度精确控制系统.该系统工作稳定,性能可靠,能够满足实验需要.     

光副载波复用系统中偏振模色散对偏振度的影响

在光副载波复用系统中若使用偏振度作为偏振模色散的监测信号将会遇到灵敏度低的问题.本文首先讨论了色度色散和初始啁啾对偏振度的影响,然后找出了影响监测信号灵敏度的因素,并提出了相应的解决方法.使用一个窄带滤波器用来平衡光载波和边带的功率,偏振度对偏振模色散的灵敏度将会明显的增长.     

基于C8051F410单片机的光纤传输组件设计

光纤通信带宽大、信噪比低、抗干扰能力强,在现代通信领域发挥着重要作用。文中选用C8051F410单片机作为微处理器,结合其他外围电路设计出一款光纤传输组件,并介绍了包括模块的整体架构、硬件电路搭建、软件开发设计和实验数据记录等内容。该组件具有体积小、精度高、操作简单的特点,实用价值明显。     

Signal noise perturbation on automotive mixed-mode semiconductor device generated by graded substrate defect

The semiconductor technologies evolution allows greatly reducing noise impact on products and many structures have been created to reduce its effect. However, this paper presents the apparition of a noise issue during the production of a mixed-mode device dedicated to automotive applications. The research investigations concerned the fact that failure was not detected at test level but at customer level; therefore, it was determinant to understand the root cause of this failure mode to drive corrective actions in order to secure customer. The challenge was to analyse noise in Failure Analysis (FA) without fault spatial localization results. Indeed, Light Emission Microscopy (EMMI) and Thermal Laser Stimulation (ex: Soft Defect Localization – SDL) were unable to provide any defective area in the product. The lack of failing device identification led us to combine electrical and design analyses in order to define hypothesis on the failure origin. It was then possible to drive physical investigations through different approaches, using physical cross-section, Secondary Ion Mass Spectrometry (SIMS) and Scanning Capacitance Microscopy (SCM) techniques. Finally, the obtained complementary results will be discussed and an explanation of the failure mechanism will be presented as the root cause issue, allowing defining the defective step in production process.     

3D SCM及其城市宏小区安全容量评估

三维波束成型是MIMO一种富有潜力的实现方式。它通过主动的天线阵列来控制天线的辐射方向,从而提高小区用户的安全容量。文章在2D SCM基础上,考虑了垂直维度的功率谱,给出了详细的3D SCM的参数描述。其次,考虑在城市宏小区环境中,评估了在不同的系统参数下的小区用户的安全容量,对比了在2D和3D两种信道模型下安全容量的改变。最后提出一种基于人工噪声的3D SCM加密算法。     

基于MPU6050模块的飞行姿态记录系统设计

为了实现对固体燃料低空模型火箭飞行姿态自动记录的需求,提出了一种基于MPU6050模块的飞行姿态记录系统设计方案,并完成系统的软硬件设计.该系统的硬件部分主要用来采集加速度模拟量并进行存储,软件部分采用C语言进行编程,完成数据读写和上传,数据处理借助上位机软件进行,还原实际飞行姿态.实际应用表明,该系统具有成本低廉、灵敏度高的特点,达到了设计要求.