项目导向的计算机审计教学方法的创新与探索

针对目前计算机审计课程教学过程中存在课堂教学与计算机审计实践脱节问题,笔者根据自身教学经验,并结合参与国家审计署项目审计的经历,提出以项目为导向、整体模块化、模块多样化的计算机审计教学方法,实现教学理论与审计实践的较好结合,充分调动教学中两个主体的主观能动性,提高了教学质量。     

二语词汇习得石化消解的认知语言学研究

词汇习得过程分析表明母语介入是二语词汇习得石化的主要原因,用认知语言学理论指导二语词汇习得石化消解研究具有重要的理论和现实意义。典型理论、隐喻、转喻与意象图式结合起来可较好地解释多义词义项之间的理据及不同词汇之间的关系。认知语言学角度的二语词汇习得有助于学习者构建较为系统的词汇网络,习得语言事实背后的认知机制,加强二语词汇的语义与二语概念直接紧密的相通,理解和生成词汇,提高词汇能力,防止词汇习得中的石化现象。     

HIGH RESOLUTION REAL-TIME MEDICAL IMAGING BASED ON PARALLEL BEAMFORMING TECHNIQUE

Improvement of frame-rate is very important for high quality ultrasound imaging of fast-moving structures.It is also one of the key technologies of Three-Dimension (3-D) real-time medical imaging.In th...     

A real time FFT-based impedance meter with bias compensation

A real time FFT-based impedance meter is here presented. It is realized simply by a standard PC in addition to a low cost two channels hardware device, and is based on a cost-effective algorithm to meaningfully reduce the known problem of the bias introduced by the relative phase and amplitude error between channels. The impedance meter exploits the implementation of an ad hoc cost-effective algorithm and a synchronous sampling allows eliminating the leakage error. The aliasing and the spectral interference are eliminated by means of an anti-aliasing filter and the use of very low distortion sinusoidal signals. Automatic measurements can be managed too, capturing different measures at different test frequencies and displaying them graphically on the PC screen. To validate the measured results comparative test were performed with respect to certified and calibrated commercially available multimeters known with good accuracies.Finally, this novel impedance meter integrates a home-made software, previously reported [1] capable to implement real time virtual instruments.     

Design and performance of vacuum capable detector electronics for linear position sensitive neutron detectors

We describe the design and performance of electronics for linear position sensitive neutron detectors. The eight tube assembly requires 10 W of power and can be controlled via digital communication links. The electronics can be used without modification in vacuum. Using a transimpedance amplifier and gated integration, we achieve a highly linear system with coefficient of determinations of 0.9999 or better. Typical resolution is one percent of tube length.     

基于AT89S52的振动数据采集系统

本文介绍了一个基于AT89S52的振动数据采集系统。该系统用单片机控制891型拾振器对结构振动信号进行采集,并将采集到的数据经过处理,通过串口发送到PC机。文中对系统的硬件组成结构予以详细介绍,并给出了软件流程。     

基于DSP的电网谐波信号采集系统设计

设计了基于DSP的电网谐波信号采集系统。详细介绍了模数转换采样结果校正的方法,通过校正可降低增益误差和偏移误差,使采样误差低至0.5%以下。讨论了DSP串口通信的设计方法和整个软件系统编写、调试的方法及其优点。实验结果验证了系统设计的合理性和可行性,精度高、可靠性高。     

基于Colley-Tukey算法对GPS捕获过程的优化

根据GPS捕获过程中相关运算的计算速度要求,针对常用的频域FFT算法速度快但规定采样点的点数N必须为2的整数幂的缺点,分析了如何利用Colley-Tukey算法对部分可分解的N值的相关运算进行优化,从而在时域算法保证精确度,同时又在速度上接近FFT算法.最后在Matlab环境下对算法进行了验证.     

玻璃瓶字符识别中运动图像的获取技术

针对啤酒瓶在线识别系统中采集运动图像的需求,提出了一种合理且实用的实时获取运动图像的解决方案,包括:摄像头、镜头和图像卡的选取、摄像机的位置标定、镜头焦距、摄相机快门速度以及光源的配置等几个方面,详细论述了奇偶场校正技术在恢复最终运动模糊图像采集中的应用及实现,并成功地应用到啤酒瓶在线识别系统中。     

应用Smartio C104H多串口卡实现多路信号采集及处理

本文论述了利用Smartio C104H多串口卡的串口通信技术,实现了多路岩石热解信号的采集分析处理。文中还对Smartio C104H多串口卡在YKR-Ⅰ岩石快速热解仪的应用进行了研究,并介绍了基于visualc++实现的上位机通信设计原理。