基于MATLAB的FIR/IIR滤波器分析与设计研究

数字滤波器在数字信号处理领域中已经得到广泛应用,利用MATLAB的数字滤波器设计工具箱可以快速有效地设计各种FIR/IIR数字滤波器,设计简单方便。在设计过程中可以随时对比设计要求和滤波器特性,并可通过不断调整参数,以使滤波器的设计达到最优化。     

Enhancing the quality metric of protein microarray image

The novel method of improving the quality metric of protein microarray image presented in this paper reduces impulse noise by using an adaptive median filter that employs the switching scheme based on local statistics characters; and achieves the impulse detection by using the difference between the standard deviation of the pixels within the filter window and the current pixel of concern. It also uses a top-hat filter to correct the background variation. In order to decrease time consumption, the top-hat filter core is cross structure. The experimental results showed that, for a protein microarray image contaminated by impulse noise and with slow background variation, the new method can significantly increase the signal-to-noise ratio, correct the trends in the background, and enhance the flatness of the background and the consistency of the signal intensity.     

基于UML的防火墙模型的构造

针对Internet面临的安全问题，阐述了设置防火墙的目的和作用，介绍了防火墙技术的基本概念和基本结构，讨论和分析了实现防火墙的主要技术手段和各自的优缺点；并在此基础上通过UML构造了相应防火墙的安全模型，使用类图解释了防火墙模型的工作过程，以序列图定义和构造了相应的规则和方法，使基于角色访问防火墙的控制变的更为方便．     

F-P滤波器解调FBG传感器的数据处理方法研究

使用可调谐F-P滤波器解调FBG传感器的方案具有测量系统体积小、波长分辨力高等优点,是目前技术较为成熟、实用性较好的解调方案.为了进一步提高解调准确度和精确度,滤波器透射峰值的计算方法和滤波器特征曲线的数学模型被不断改进.本文对这些处理方法进行了介绍和分析.     

高校科研项目的筛选与立项管理刍议

科研项目管理是科研管理工作中的重要环节,是一个系统工程,贯穿于项目活动的全过程,渗透在项目的申报立项、实施、验收鉴定每一环节中,每一个环节的管理工作都对项目的顺利实施完成产生一定的影响。本文着重分析了当前影响高校科研项目申报质量的主要原因,提出如何加强科研项目在申请过程中的筛选、审核与立项等问题。     

基于小波变换的语音增强算法

结合小波技术对传统的维纳滤波算法进行改进,对语音信号进行离散小波变换,求得小波系数,计算小波系数的阈值,然后利用阈值对小波系数进行过滤,再对小波重构信号,信号经过维纳滤波器模型达到去噪效果。最后对算法进行了仿真试验。     

Effect of endpoint conditions on position and velocity near impact in tennis

Smoothing to obtain accurate position and velocity data near impacts in sport biomechanics studies is complicated by the accelerations of impact, endpoint effects and the smoothing technique used. Wrist goniometric data with two levels of random noise added were used to examine three endpoint modelling conditions for obtaining accurate position and velocity data at impact in the tennis forehand. The common approach of smoothing through impact created distortions of the position signal up to 100 ms before impact and resulted in consistent underestimations (-3.2%) of wrist angle and angular velocity (-67.9%) at impact. New linear and polynomial extrapolation conditions smoothed with all techniques provided lower root mean squared errors than the smoothing-through-impact condition, with discrete wrist positions at impact within 1.1% of the criterion data. Both the new linear and polynomial conditions can be used to make more accurate angular position and velocity estimates for tennis impacts, whereas the smoothing-through-impact condition creates spurious decreases in speed before impact that in the past have been assumed to be aspects of skilful movement.     

一个8031单片机控制的数字滤波系统

本文提供一个设计IIR数字滤波器的实例,并用MCS—51汇编语言程序实现这个数字滤波器;介绍一个由A/D转换器、8031单片机和D/A转换器构成的实际信号处理系统;最后,对该系统进行试验。     

低对比度图像增强与边缘提取

针对低对比度图像增强和边缘检测问题，提出基于小波变换并结合中值滤波增强和Sobel算子边缘检测的变换处理方法，能获得尽可能完整的图像特征。     

克拉申的“情感过滤假说”与二语习得研究现状综述

情感因素是语言学习过程中必不可少的因素。克拉申（Krashen）的情感过滤假说揭示了语言习得中的过滤作用,文章以＂情感过滤假说＂和＂二语习得＂为关键词在CNKI中进行检索,并对搜索到的44篇期刊文章及1篇硕士论文（2002-2010）进行了概括分析。