基于识别技术的环形生产线监控系统

使用图像识别技术,提出了一种应用于环形工业生产线仪表数据采集与自动监控的系统架构,并结合实际的环形生产线平台,给出了详细的硬件设计和软件设计。针对工业现场仪表样本采集困难的弱点,为保障系统的识别率,利用虚拟样本改进的BP神经网络设计了模式分类器,并移植到FPGA上,发挥其并行计算能力,实现了对生产线的实时、高效监控。     

Low-power survivor memory architecture for DFSE in 1000BASE-T transceiver

A novel approach to survivor memory unit of Decision Feedback Sequence Estimator （DFSE） for 1000BASE-T transceiver based on hybrid architecture of the classical register-exchange and trace-back methods is proposed. The proposed architecture is investigated with special emphasis on low power and small decoder latency, in which a dedicated register-exchange module is designed to provide tentative survivor syml~ols with zero latency, and a high-speed trace back logic is presented to meet tile tight latency budget specified for 1000BASE-T transceiver. Furthermore, clock-gating register banks are constructed for power saving. VLSI implementation reveals that, the proposed architecture provides about 40% savings in power consumption compared to the traditional register-exchange architecture.     

Study on tribological behaviors of short glass fiber and polytetrafluoroethylene reinforced polycarbonate composites via a d‐optimal mixture design

This study analyzed variations of tribological behaviors that depend on the injection molding techniques during the blending of short glass fiber (SGF) and polytetrafluoroethylene (PTFE) reinforced polycarbonate (PC) composites. The proposed planning of blending experiments is to use a D‐optimal mixture design (DMD). The tribological behaviors of friction coefficient and wear mass loss were selected for discussion. Nine experimental runs, based on a DMD method, utilized to train the back‐propagation neural network (BPNN) and then the simulated annealing algorithm (SAA) approach is applied to search for an optimal mixture ratio setting. In addition, the result of BPNN integrating SAA was also compared with response surface methodology (RSM) approach. The results of confirmation experiment show that DMD, RSM, and BPNN integrating SAA method are effective tools for the optimization of reinforced process. Furthermore, the scanning electron microscope (SEM) images show that the abundant debris are peeled off from the matrix materials and predominant delamination mechanisms and plastic deformation are shown on the worn surface after tribological behavior tests. Copyright © 2010 John Wiley & Sons, Ltd.     

浅谈SDH系统故障定位及排除方法

根据多年SDH系统的调试及维护经验,概括了SDH系统故障定位的基本思路及常用排除方法,并结合案例分析介绍了SDH系统故障定位最常用的环回法。     

基于改进BP神经网络的数字识别

针对BP(Back Propagation)神经网络易陷入局部极小、收敛速度慢的缺点,提出了一种新的BP神经网络改进算法.与标准BP算法比较,该系统通过结合附加动量法和自适应学习速率形成新的BP改进算法.附加动量法虽然可以使BP算法避免陷入局部极小,但是对初始值的选取比较敏感,而且选取合适的学习速率比较困难.而自适应学...     

RFID高频读写器防碰撞算法研究

基于对RFID(无线射频识别,Radio Frequency Identification)高频读写器防碰撞性能提高的目的,介绍了二进制搜索算法原理,并基于二进制搜索算法详尽研究了一种符合ISO/IEC 14443A规范的比特帧防碰撞算法,比特帧防碰撞算法能有效的实现高频读写器的防碰撞功能。此方法为解决RFID高频防碰撞问题,提高高频读写器性能具有重要的实用意义和指导意义。     

Robust airfoil optimization based on improved particle swarm optimization method

A robust airfoil optimization platform is constructed based on the modified particle swarm optimization method (i.e., the second-order oscillating particle swarm method), which consists of an efficient optimization algorithm, a precise aerodynamic analysis program, a high accuracy surrogate model, and a classical airfoil parametric method. There are two improvements for the modified particle swarm method compared with the standard particle swarm method. First, the particle velocity is represented by the combination of the particle position and the variation of position, which makes the particle swarm algorithm a second-order precision method with respect to the particle position. Second, for the sake of adding diversity to the swarm and enlarging the parameter searching domain to improve the global convergence performance of the algorithm, an oscillating term is introduced to the update formula of the particle velocity. At last, taking two airfoils as examples, the aerodynamic shapes are optimized on this optimization platform. It is shown from the optimization results that the aerodynamic characteristic of the airfoils is greatly improved in a broad design range.     

新型TFT-LCD黑矩阵的细线化研究

介绍了新型TFT-LCD黑矩阵细线化研究。在原有工艺设备的基础上,突破设备局限和工艺瓶颈,通过引入相掩膜技术和背面曝光设备,达到进一步减小黑矩阵线宽的效果。实验测试结果显示:在普通掩膜板设计上应用相位移掩膜板技术,降低透光区边缘衍射和散射现象,使曝光后黑矩阵线宽降低1.0~1.5μm。在原有工艺基础上添加背面曝光工艺,使黑矩阵材料在显影后进行背面曝光预固化,改善黑矩阵图形形貌,进一步减小黑矩阵线宽达到0.3~0.5μm。通过新工艺和新设备的引入和应用,黑矩阵线宽整体降低1.5~2.0μm,达到5.0~5.5μm,可以满足目前高PPI(单位面积像素个数)产品对透过率和对比度要求。     

450 mm晶圆CMP设备技术现状与展望

分析化学机械平坦化(CMP)耗材发展现状及趋势,推断450 mm晶圆的CMP设备及技术的迫切性;在此基础上,展望450 mm晶圆将会采用系统集成技术、多区域压力控制承载器技术、抛光垫修整技术、终点检测技术、后清洗技术,并初步分析以上这些技术的特点。最后指出随着晶圆制造厂激烈竞争和持续投资,对450 mm的CMP设备要求必有所突破。     

基于MSP430自动往返小车的设计

设计了一个自动往返和智能控制的小车。采用MSP430F149为核心芯片,选用双全桥驱动芯片作为小车电机驱动,利用PWM技术动态控制电动机的转速,红外线光电传感器检测标识线,U型红外光电传感器测量路程。 MCU判断和处理各种传感器传回的信息,向电机驱动器发出指令,控制小车在往返过程中实现自动加速、限速、减速、刹车、倒车和在液晶显示器上显示行驶时间,行驶路程等相关数据。