基于Windows多线程开放数控主控系统的实现

文中讨论了如何在Windows环境下，用VC＋＋实现开放式数控的主控系统。主要介绍了如何用多线程机制实现数控系统的多任务，以及多任务之间的协调和同步问题。同时，还讨论了实现数控机床上位机（Windows）和下位机（DOS）之间的串口通信问题。该主控系统已经用于一台数迭机床的改造实验，并且取得了良好的效果。     

Windows多任务调度机制中的核心技术分析

本文主要基于Windows的多任务调度机制,通过对Windows内核中未公开的任务调度程序及相关函数的分析,揭示了Windows抢先式和非抢先式调度过程的内部工作原理。     

基于Windows+RTX的CNC实时多任务调度设计

基于Windows.NET开发平台及实时扩展内核RTX构建了全软件数控系统基本原型,结合非实时任务组件和实时任务组件技术对系统功能进行了模块划分,深入讨论了多任务调度策略,并引入多线程技术和实时技术完成系统的通信任务。     

临界区机制剖析与自定义实现

在Windows操作系统扩展过程中,由于自定义调度需要自定义的线程同步,因此需要定制同步机制。经过剖析原有临界区的实现机制,设计实现了自定义临界区。在自定义临界区中,利用内核驱动程序提供调度;用无符号整数原子操作,保证内核对象操作原子性;应用内存映射机制将内核对象地址映射为用户态地址,使得操作可在用户态完成从而提高操作效率。实验结果表明,自定义的临界区可以实现线程同步。     

基于Windows的开放式数控系统实时任务调度研究

对以Windows操作系统为平台的开放式数控系统实时多任务处理方案进行了研究。在探讨了基于Windows的多任务和多线程的实现方法、Windows的任务调度模式和实时性的实现形式的基础上,应用VC++6.0编程,给出了基于Windows XP开发的开放式数控系统的模块框架、多任务调度实现方案,并提出了一种新的处理实时性任务的方法;实现了数控总控软件的实时任务调度和多线程的应用。     

基于微控制内核的开放式数控系统的研究与实现

提出了一种运行于WindowsNT平台,基于软件实现的开放式数控系统:MAGIC,该系统基于微控制内核-可装配命令解释器体系结构,可装配命令解释器完成对单个控制部件的控制抽象,借助微控制内核提供的对象并发运行机制及同步机制,多个命令解释器可实现I/O与轴之间的精确同步关系及复杂的多轴联动控制,通过使用统一解释器指令集可实现用一致的编程接口来控制抽象硬件。该数控系统已成功地在HRP系列快速成形机上应用。     

多任务编程技术的最新发展:作业对象和纤程

通过对最新Windows系统所支持的作业对象和纤程的实例分析，介绍了作业对象和纤程的主要特点、使用方法和适用场合，揭示了Windows系统多任务编程机制的最新发展和总体框架。     

基于WindowsNT的高精度软定时器的实现

本文讨论了如何在Windows NT平台上,通过内核Timer对象和Event同步对象编写内核驱动程序实现高精度定时器的方法。这种方法定时精度较高,基本可以代替硬件定时器。     

多线程快速文件搜索器

简要介绍多线程同步机制,用户方式中的线程同步、线程与内核对象的同步、包括原子访问一互锁的函数家族、关键代码段、事件内核对象、等待定时器内核对象、信标内核对象、互斥内核对象,讲述快速文件搜索的实现原理,并且利用关键代码段实现多线程同步,给出了快速文件搜索器的主要实现过程。     

嵌入式实时多任务操作系统核心MOS96的研制

文中介绍了嵌入式实时操作系统内核--MOS96,描述MOS96内核以及与之配套的实时多任务开发系统的设计思想及实现方法,内核系统的一些主要部分如任务状态,任务调度算法,任务间同步和通信的方法等.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

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.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

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。     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

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。     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

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.