SZ绞成缆设备电控系统的构成及变频器故障分析

SZ绞设备是将单元绞制和缆芯绞制在一道工序完成的一种专业电缆生产设备。SZ绞设备采用了先进的变频调速技术和PLC控制技术,有的还采用了伺服驱动,使其控制快速、精确和可靠。本文就SZ绞设备的电控系统构成及在调试运行中遇到的变频器故障进行了分析。     

ADC系统性能测试及提高

本文简介了一种基于FPGA和DSP,对ADC系统进行性能分析并对其转换后的数字进行数据采集的方法。其中性能分析主要是针对ADC的信噪比和无杂散动态范围。同时,主要介绍了ADC系统中时钟、电源、模拟信号输入等方面性能改善的方法。并以此来提高SNR,实现对有效位数和整体性能的提高。     

基于模糊PI控制的交流调速系统研究

传统PI控制器以固定不变的PI参数去处理变化多端的动态过程,很难满足各种工况下的性能指标。针对这一问题,本文将模糊控制理论引入到交流调速系统的PI控制器中,实现PI参数的实时调整,显著地改善调速系统的动态性能。仿真实验表明,在同等实验条件下,模糊PI控制的动态性能优于传统PI控制的性能。     

Similarity assessment of design behavior data

Understanding the cognitive aspects of design behavior is important in understanding the nature of design ability, and various studies are being conducted to understand the underlying cognitive aspects of design abilities and to develop methods to enhance them. While simple visualization supports in graphical forms are helpful in finding characteristics in protocol analysis, similarity assessment of the protocol data of various designers and various design tasks and situations will also help to understand designers and design problem characteristics. In this paper, we propose similarity assessment methods of design behavior data as support tools for understanding and analysis of the nature of design ability.     

LPP solution schemes for use with face recognition

Locality preserving projection (LPP) is a manifold learning method widely used in pattern recognition and computer vision. The face recognition application of LPP is known to suffer from a number of problems including the small sample size (SSS) problem, the fact that it might produce statistically identical transform results for neighboring samples, and that its classification performance seems to be heavily influenced by its parameters. In this paper, we propose three novel solution schemes for LPP. Experimental results also show that the proposed LPP solution scheme is able to classify much more accurately than conventional LPP and to obtain a classification performance that is only little influenced by the definition of neighbor samples.     

A feature extraction method for use with bimodal biometrics

Bimodal biometrics has been found to outperform single biometrics and are usually implemented using the matching score level or decision level fusion, though this fusion will enable less information of bimodal biometric traits to be exploited for personal authentication than fusion at the feature level. This paper proposes matrix-based complex PCA (MCPCA), a feature level fusion method for bimodal biometrics that uses a complex matrix to denote two biometric traits from one subject. The method respectively takes the two images from two biometric traits of a subject as the real part and imaginary part of a complex matrix. MCPCA applies a novel and mathematically tractable algorithm for extracting features directly from complex matrices. We also show that MCPCA has a sound theoretical foundation and the previous matrix-based PCA technique, two-dimensional PCA (2DPCA), is only one special form of the proposed method. On the other hand, the features extracted by the developed method may have a large number of data items (each real number in the obtained features is called one data item). In order to obtain features with a small number of data items, we have devised a two-step feature extraction scheme. Our experiments show that the proposed two-step feature extraction scheme can achieve a higher classification accuracy than the 2DPCA and PCA techniques.     

移动通讯及动态Web在原油计量中的应用

针对传统人工抄表计量方式存在的不足,利用先进的移动通讯技术和动态Web技术研制开发了新一代油田计量站原油分站计量系统,实现了计量数据的自动采集、无线远程传输和网络发布共享。     

软件技术专业实践教学体系的构建

简要介绍了软件技术专业实践教学体系构建的背景,结合具体课程给出实践教学体系构建过程,实践证明构建合理的实践教学体系是实现软件技术专业工学结合人才培养模式创新的必备条件和关键。     

基于Flex和Java的在线考试系统

随着计算机应用的迅猛发展,网络应用不断扩大,远程教育和虚拟大学的出现等等。传统的考试方式已经不能适应现代考试的需要。该文利用当前流行的Flex技术结合Java技术来构造RIA界面,实现在线考试系统,加强与学生的交互能力,减轻教师的工作负担及提高工作效率,与此同时也提高了考试的质量,从而使考试更趋于公证、客观。     

基于SOA技术的高校URP建设的研究

通过基于SOA技术的高校管理工作一体化信息系统软件的设计,综合性地量化学校各项重要信息,使信息一体化程度更为集中,帮助管理工作者、校务管理人员做出动态的管理决策调整,对于URP流程改造提供具体的实践模型参考。同时研究出一种能够应用于各类普通高校管理工作的无线与网络相结合的软件系统设计模型,提供一种可量化的工作数据系统样本,以比较低廉的代价解决校园信息化过程中的信息孤岛问题,进一步提升校园信息一体化程度。