基于DSP的足球机器人控制系统的设计

对微型足球机器人底层控制系统进行了研究,分析了用普通单片机控制的足球机器人在比赛中的利弊,给出了一种基于DSP的足球机器人控制系统的实现方案。采用DSP芯片构造足球机器人后,不仅简化了系统外围设备,降低了系统的损耗,而且提高了系统的准确性和实时性,获得更好的控制效果。详细描述了基于DSP的足球机器人控制系统组成的各个模块的硬件实现,并给出了相应的软件设计方案。最后通过机器人左右轮设定速度与测量转速关系曲线证明了设计方案的有效性。     

智能风扇控制系统设计

本文是利用单片机为核心设计风扇的控制系统，以STC89C52单片机控制芯片，通过DS18B20温度传感器采集实时温度，再利用脉冲宽度调制PWM的方式，达到调节风扇的温度的作用。可以通过按键对最低温度进行设置，同时可以调节风扇初始速度；对芯片导入软件编好的各个模块的程序并运行，使得风扇转速跟随温度的变化而变化的；风速的变化不仅可以自动控制，还有通过按键挡位设置，并配有定时功能，从而实现STC89C52单片机对风扇的智能控制。     

基于单片机的自适应温度控制系统

人体生物知性检测要求较高的温度准确度和稳定度，针对该应用设计了一个温度控制器；用现代控制理论分析了该系统；建立了系统的数学模型，并推导出其状态空间方程。从而提出了先使温度快速稳定在目标温度附近，然后通过自调整参数达到目标温度的自适应温度控制方案。仿真计算的结果证明了方案的可行性和对环境温度变化的适应能力。最后以PIC1672A单片机为核心，具体实现了一个使用该控制方案的温度控制系统。实验结果表明该方案可以取得满意的准确度和稳定度。     

电渣炉单片机控制系统的研究与设计

本文介绍了一种基于单片机控制的电渣重熔过程自动控制系统，研究一种适合于电渣炉，电弧炉等过程实现自动化控制的一般设计方法，并给出了电渣炉单片机控制系统的硬件组成及软件流程。     

带式过滤机控制系统的设计与实现

本文介绍了用单片机实现带式过滤机自动控制系统的软／硬件方案，重点叙述了过滤机的四路纠偏控制、四路排液控制、电动机主控回路的控制技术和实现过程。     

微型燃气轮机控制及电力变换系统的研制

阐述了发电用100kW级微型燃气轮机控制过程及其电力变换系统的设计和集散控制方法，描述了其结构与功能特点。针对微型燃气轮机的控制特点，提出了异于传统控制方法的有效控制方案，即燃机点火后的闭环控制方法。采用中性点可控的解耦控制方法解决了电力变换系统中的三相逆变电源的不对称问题。理论分析和实验表明，该控制系统稳态和动态控制性能良好，达到了各项技术指标，实现了全部设计功能，具有广阔的应用前景。     

国旗升降控制系统的设计与实现

本文介绍了一款基于单片机的国旗升降控制系统的设计与实现，给出了系统设计的基本要求、方案、硬件设计及单片机程序流程。系统采用AT89C51单片机作为主控制芯片，采用光电传感器检测旗帜高度，使用H型驱动电路驱动直流电机，利用8255A和相关电路实现键盘、显示功能，完成了升降旗控制的基本要求。系统具有集成度高，操作简单方便等特点，能够快速、稳定、安全、可靠地对国旗升降进行智能化控制。     

四旋翼微型飞行器控制系统设计

四旋翼微型飞行器是一种以4个电机作为动力装置,通过调节电机转速来控制飞行的欠驱动系统;为了实现四旋翼微型飞行器的自主飞行控制,对飞行控制系统进行了初步设计,并且以C8051F020单片机为计算控制单元,给出了飞行控制系统的硬件设计,研究了设计中的关键技术;由于采用贴片封装和低功耗的元器件,使飞行器具有重量轻、体积小、功耗低的优点;经过多次室内试验,该硬件设计性能可靠,能满足飞行器起飞、悬停、降落等飞行模态的控制要求。     

基于单片机控制的LED灯具智能开关控制系统

该文提出了基于单片机控制的LED灯具智能开关控制系统设计的基本思路,以单片机、红外传感器和光敏电阻为主要器件,从硬件电路和系统软件两方面实现了对控制系统的设计。     

单片机控制的光自动跟踪控制系统

阐述了用单片机控制的光电跟踪控制系统的硬件设计及提高信号转换精度的方法,具有介绍了系统组成及工作原理,信号转换电路,单片机采样处理方法及软件设计。     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

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.     

法律信息库系统

本文分析了法律数据库的结构和特点，介绍了采用面向对象设计方法和超文本数据库技术开发和实现法律信息库系统将作为重要网络资源之一为不同用户进行法律咨询服务。     

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.     

International Journal of Automation and Computing Table of Contents

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Information for authors

正SCIENCE CHINA Information Sciences(Sci China Inf Sci),cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press,is committed to publishing highquality,original results of both basic and applied research in all areas of information sciences,including computer science and technology;systems science,control science and engineering(published in Issues with odd numbers);information and communication engineering;electronic science and technology(published in Issues with even numbers).Sci China Inf Sci is published monthly in both print and electronic forms.It is indexed by Academic OneFile,Astrophysics Data System(ADS),CSA,Cabells,Current Contents/Engineering,Computing and Technology,DBLP,Digital Mathematics Registry,Earthquake Engineering Abstracts,Engineering Index,Engineered Materials Abstracts,Gale,Google,INSPEC,Journal Citation Reports/Science Edition,Mathematical Reviews,OCLC,ProQuest,SCOPUS,Science Citation Index Expanded,Summon by Serial Solutions,VINITI,Zentralblatt MATH.     

Erratum to: Fast global kernel fuzzy c-means clustering algorithm for consonant/vowel segmentation of speech signal

正Erratum to:J Zhejiang Univ-Sci C(ComputElectron)2014 15(7):551-563doi:10.1631/jzus.C1300320The original version of this article unfortunately contained mistakes.Algorithm 6 should be as follows:Algorithm 6 FGKFCM-F clustering Input:(1)X={x_1,x_2,…,x_N},,x_iR~d,i=1,2,…,N,the dataset;(2)C,1C≤N,the number of clusters;(3)ε0,the stopping criterion;     

Journal of Zhejiang University-SCIENCE C (Computers & Electronics) Total contents

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A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.