基于AutoCAD信号控制电路绘图及仿真系统的研究

为了解决现在铁路信号控制电路设计软件效率低、功能单一的弊端，以美国的Ａｕｔｏｄｅｓｋ公司１９９２年推出的ＡｕｔｏＣＡＤＲ１２作为主要操作平台，建立了ＶｉｓｕａｌＣ＋＋、Ｅｘｃｅｌ、ＶｉｓｕａｌＢａｓｉｃ、Ｆｏｘｐｒｏ、ＡｕｔｏＬｉｓｐ协同工作的铁路信号控制绘图及仿真软件包。此软件包性能优越、界面友好、操作简单。     

EXCEL在离散事件系统仿真中的应用研究

该文将Ｍｉｃｒｏｓｏｆｔ Ｅｘｃｅｌ应用于离散事件系统仿真中,以Ｅｘｃｅｌ的工作表作为输入和输出界面,采用宏语言（ＶＢＡ）编写仿真代码,对单服务排队系统进行了仿真研究,文中内容可为离散事件为系统仿真和教学提供参考。     

用VisualBasic编写控制程序方法

ＶｉｓｕａｌＢａｓｉｃ是设计Ｗｉｎｄｏｗｓ程序的强有力的工具，一般都被用来开发应用程序，很少被用来开发工业控制程序。本文根据一般的工业控制模型，提出了用ＶｉｓｕａｌＢａｓｉｃ开发控制程序的方法。由于ＶｉｓｕａｌＢａｓｉｃ不能直接对寄存器进行操作，所以必须借助动态连接库来实现对寄存器的操作。文中以ＡＤＡＭ４０１８为采样输入模块（Ａ／Ｄ）、ＰＣＬ８３９为控制输出模块（Ｄ／Ａ）为例，详细说明用Ｖｉ ｓｕａｌＢａｓｉｃ开发Ｗｉｎｄｏｗｓ控制程序的方法。     

Visual Basic4.0在开发分析化学实验仿真多媒体CAI中的应用

大学化学实验的多媒体仿真模拟是ＣＡＩ研究的一个重要领域。Ｖｉｓｕａｌ Ｂａｓｉｃ的“可视性”和“面向事件，”且功能强大易于使用特征，十分适合化学工作者开发本专业的多媒体ＣＡＩ课件。本文结合作者开发分析化学实验仿真系列课件的体会，讨论在建立化学实验仿真ＣＡＩ过程中，如何利用ＶＢ４．０各种控制的属性、事件和方法。文中讨论了分析化学仿真系统的标准化图像用户界面的建立，互动的实现方法，动画的作用及分析学实     

热点视界

互联网ＰＣＩＢＭ 推出 ＮｅｔＶｉｓｔａ Ａ２０ｉ 产品 本刊讯ＩＢＭ公司３月１２日发布全新的互联网 ＰＣ——多媒体桌面机 ＮｅｔＶｉｓｔａ Ａ２０ｉ。新品在网络方面应用了ＩＢＭ的多项专利,包括５个自定义彩色上同热键, ＩＢＭ第三代Ｒａｐｉｄ Ａｃｃｅｓｓ键盘、支持３６０度旋转的ＩＢＭＳｃｒｏｌｌＰｏｉｎｔ Ⅱ鼠标等。另外,ＮｅｔＶｉｓｔａ Ａ２０ｉ还预装了一系列优秀上网软件,如ｉＷＰＳ和网络蚂蚁等． 新款ＮｅｔＶｉｓｔａ Ａ２０ｉ还全面提升了产品配置,采用奔腾Ⅲ８６６／９３３ＭＨｚ处理器, ６４ＭＢ／１２８…     

ActiveX技术综述

本文结合目前Ｉｎｔｅｒｎｅｔ（ＷＥＢ）技术发展动向,简略介绍了Ｍｉｃｒｏｓｏｆｔ提出的ＡｃｔｉｖｅＸ技术的内容,阐述了ＡｃｔｉｖｅＸ技术与ＷＥＢ站点建设和桌面程序开发的关系,以及利用ＶｉｓｕａｌＣ＋＋和Ｖｉｓｕａｌ开发ＡｃｔｉｖｅＸ部件的步骤和方法,并给出了在ＷＥＢ网页中使用ＡｃｔｉｖｅＸ部件的例子。     

用数据报表设计器创建报表

数据环境设计器（Ｄａｔａ　Ｅｎｖｉｒｏｎｍｅｎｔ　ｄｅｓｉｇｎｅｒ）与数据报表设计器（Ｄａｔａ　Ｒｅｐｏｒｔ　ｄｅｓｉｇｎｅｒ　）均是Ｖｉｓｕａｌ　Ｂａｓｉｃ６．０的新增功能,它们的出现大大增强了Ｖｉｓｕａ　Ｂａｓｉｃ　处理数据的能力。在以往的Ｖｉｓｕａ　Ｂａｓｉｃ　版本中,制作报表都是通过第三方产品来完成并通过Ａｃｔｉ　ｖｅＸ控件输出的。这两种设计器的出现,使得Ｖｉｓｕａｌ　Ｂａｓｉｃ　程序员再也不用考虑选择一个什么样的第三方工具设计报表了,所有的设计全部在Ｖｉｓｕａｌ　Ｂａｓｉｃ　内部完成,…     

控制系统计算机仿真CAI软件的研制

本文介绍了研制的一套内容丰富,功能强,适合于自动化专业本科生、研究生学习使用的控制系统计算机仿真辅助教学软件,它是基于计算机仿真,控制原理,控制工程,系统辨识,优化技术,计算机软件技术,计算数学等有关学科的基本知识,结合人工智能的方法,采用Ｖｉｓｕａｌ Ｂａｓｉｃ与ＭＡＴＬＡＢ语言制作的包含控制原理学习模块,控制系统仿真学习模块,控制系统参数优化学习模拟以及高级控制系统学习模块的软件。实验结果表明     

在AutoCAD下用VB程序实现数据库数据的查询与传递

介绍了在标准图形绘制参数化中，以ＡｕｔｏＣＡＤＦｏｒＷｉｎｄｏｗｓ为平台，用ＶｉｓｕａｌＢａｓｉｃ（ＶＢ）中实现标准件标准值的查询，并把查询结果用ＶＢ的ＤＤＥ功能传递给ＡｕｔｏＣＡＤ为ＡｕｔｏＣＡＤ的二次开发提供了一种新方法。     

也谈利用VB实现图象的存储浏览

《电脑技术》１９９９年第１期上的《利用ＶｉｓｕａｌＢａｓｉｃ３．０实现图象浏览》（以下简称《ＶＢ３．０》）一文所说实例,本人在Ｗｉｎｄｏｗｓ９５／９８环境下用ＶＢ５．０实现时存在问题,经过探索研究找到了问题的根源,并顺利实现了图象的存储及浏览。下面说明问题所在并通过一个实例给出解决方法。存在的问题ＶｉｓｕａｌＢａｓｉｃ中的数据库专用工具来源于ＭｉｃｒｏｓｏｆｔＡｃｃｅｓｓ数据管理系统,在这个数据库上可以创建Ａｃｃｅｓｓ数据库,其数据库字段类型Ｂｉｎａｒｙ 具有存储图象数据的功能,但问题在于：在Ｂ…     

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.