基于无线传感网络技术的糖厂pH值测量

针对无线传感网络技术在糖厂澄清工段pH测量上的应用,研究并改进了pH测量装置,以提高其抗干扰能力。将无线传感网络技术应用其中,实现了测量数据的实时传递,使得糖厂澄清工段pH测量数据的传输摆脱了线缆的束缚,很大程度上提高了系统的可扩展性,方便了系统的维护。     

基于广义预测一碳饱充过程的控制研究

糖厂澄清工段一碳饱充过程是一个具有强非线性、多输入等特点的复杂系统,存在很多不确定因素,所以一直以来都没有很好地解决澄清过程的稳定控制问题.针对上述问题,采用数据的建模方法,对糖厂澄清工段一碳饱充进行BP神经网络建模,然后把模型作为广义预测控制的预测模型,将广义预测控制算法对糖厂澄清工段一碳饱充进行优化控制.在Matlab上进行仿真,结果表明,BP神经网络的广义预测控制算法具有鲁棒性强、控制精度高等优点,并使糖厂澄清工段一碳饱充系统输出很快稳定到设定值,实现了优化控制,减少能耗.     

基于KF与ESN的糖厂澄清工段在线预测

糖厂澄清工段是甘蔗制糖的重要工艺环节之一,是一个复杂的物理、化学过程,具有非线性、大时滞、时变等特点.而且不同的榨季、甘蔗的品种、新技术的应用等情况,都可能导致过去良好的控制模型往往不能及时适应新情况的发生.基于大量离线、在线数据,结合回声状态网络(ESN)和Kalman滤波(KF)的特点,设计了应用于糖厂澄清工段的在线自适应预测方法.该方法将Kalman滤波应用于ESN的高维状态空间中,可以直接对网络的输出权值进行更新.将仿真结果与基于EKF的RBF网络相比较,说明了基于KF与ESN的糖厂澄清工段在线预测模型的优越性.     

基于USB的pH值控制器数据通讯的实现

介绍了基于ATMEL公司的AT91M55800的糖厂pH值控制器与上位机USB通讯的实现.包括三个方面:一是AT91M55800上USB软硬件的设计;二是上位机上USB驱动的编写;三是上位机应用软件的实现.采用USB方式传输现场数据,具有数据传输快速稳定,使用方便、即插即用、支持热插拔等等优点.配合上位机软件,可以清晰直观的采集和显示现场澄清工段的pH值数据.     

启发式动态规划在糖厂澄清工段pH值控制中的应用

糖厂澄清工艺是一个复杂的物理化学反应过程,具有强非线性、时变大时滞、多输入输出等特点,对其建立精确的数学模型和实现pH值的稳定控制非常困难.为此,基于模糊神经网络和启发式动态规划(HDP)控制器,构建了模糊神经网络模型.该模型的具体实现过程是将HDP优化方法应用于澄清工段,模拟试验装置中的中和pH值控制.试验表明,该控制系统取得了很好的控制效果,具有很强的鲁棒性.     

制糖过程中递归模糊神经网络软测量技术

糖厂澄清工段过程包含复杂的物理和化学反应,具有非线性、大滞后和不确定性的特点,难以建立精确的机理模型.常规神经网络建模是静态映射,实际应用中,权值的调节不能充分利用工业生产现场的动态数据信息,效果不理想.为此,提出了含有递归环节的T-S模糊神经网络(TSRFNN)结构,采用混沌BP学习算法引入非线性自反馈项获得复杂系统的动力学特征,通过与常规T-S模糊神经网络(TSFNN)在糖厂澄清工段过程的建模与仿真试验中进行比较,结果表明,在处理这类时变复杂系统建模方面TSRFNN表现出更加优越的性能,获得了非线性系统的全局最优模型.     

井口填罐监控系统中PLC和嵌入式PC/104+的通信实现

文章阐述了井口填罐监控系统的整体结构,主要介绍了井口填罐监控系统中PLC和嵌入式PC/104+的通信实现方式:PLC和嵌入式PC/104+编程软件的通信、PLC和嵌入式PC/104+监控程序的通信。该通信方法对相近系统的设计有着重要的参考意义。     

PC104故障监控平台FPGA程序设计

PC104总线是专为嵌入式控制系统定义的一种工业控制线,其应用广泛,但是内部结构复杂,出现故障不易检测。设计了一种基于FPGA的PC104总线故障自动监控平台,对PC104总线信号进行实时监控和故障检测。该平台利用FPGA程序采集和处理总线信号,并传至上位机处理显示。系统中利用FPGA程序实现其功能模块,包括捕获POST上电自检指令和BIOS自检端口代码、监测总线电压水平、监控时钟和复位等关键信号的质量、控制PC104的自动复位和BIOS设置模式等功能。给出上位机监控结果和FPGA实时检测得到的时序图,反映了该FPGA程序在本系统中满足PC104总线检测的技术要求。     

列车运行监控系统设计与实现

PC/104总线秉承了许多IBM-PC开放式总线结构的优点,针对列车运行的特点和安全性的要求,设计了基于PC/104总线的列车运行监控系统,给出了列车运行监控系统的基本组成和软件结构设计,介绍了系统各模块的构建方法,以可靠性、模块化等软件工程理论为指导,采用标准C语言设计了实时性好、监测控制高效可靠、数据记录准确的列车运行监控软件,实现了对列车运行系统进行实时监控,试验结果表明,该监控系统设计方案合理可行,有效的保障了列车运行安全,促进了列车运行管理自动化和列车操纵规范化.     

采空区瓦斯抽采实验监控系统的设计

为了实时掌握采空区瓦斯抽采实验系统的运行状况,设计了一套采空区瓦斯抽采实验监控系统。该监控系统采用EDA9017和EDA9150采集巷道瓦斯流量和浓度、风流静压力、风速值和风机的运行状态信息,并将采集的数据通过RS485总线传入PC机,使操作者通过监控界面即可了解整个采空区瓦斯抽采实验系统的运行状况。实际应用验证了该监控系统的有效性、稳定性和可靠性。     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

Call for papers Special issue on Modeling and control technologies for civil,energy,and power systems

正The control of civil,energy,and power systems presents significant new challenges for modeling and control theory.The purpose of this special issue is to provide a forum for researchers and practical engineers to discuss the recent advances in modeling and control technology development for civil,energy,and power systems.Prospective authors are invited to submit their original contributions with the focus on theory or applications of modeling,control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate and promote academic exchange between Chinese and foreign scientists everywhere.