Structure for automated architectural sketch design

This paper outlines a structure for automated architectural sketch design, examines its theoretical basis, and indicates some general features of its computer implementation. Design goals are identified as fulfilling a central role in the creation of suitable mechanisms for generating, evaluating and selecting design solutions. It is suggested that these mechanisms should operate at each of the levels of a hierarchial architectural sketch design decision-making structure.     

AUTOMATA AND DIGITAL COMPUTERS

A discrete time system representation of automata and abstract digital computers is investigated. Morphisms between these time systems recapture the hierarchial ordering of the classical automata. Digital computers may be also viewed as discrete time systems. The relationship between computers may be also viewed as discrete time systems. The relationship between computers so viewed and automata is investigated.     

Implementation of structured display files in interactive colour graphics

This paper discusses the various types of data structure used in computers, analyses their advantages and disadvantages, and assesses their suitability for use in microprocessor-based interactive computer graphics. Its main purpose is to define a display file structure which introduces levels of hierarchy amongst the elements of computer-generated images. The use of structured display files arises from the need to assist the user of an interactive system by supplying the software tools required to allow easy manipulation of the image contents.     

脉冲发电机组计算机控制系统的研究

介绍了一种脉冲发电机组的计算机控制系统, 介绍了该系统的励磁控制系统、模式识别系统和工业控制网络, 介绍了该系统的软、硬件设计以及控制系统特点。     

分布式仓库监控系统通信接口设计与实现

介绍了在由ＰＣ机及单片机组组成的分布式仓库监控系统中,主控单片机与ＰＣ机及多台从机实现实时通信的方法,给出了其硬件结构,并详细讨论了通信原理及设计思想。     

基于工作站和EUCLID-IS的计算机组装结构CAD系统研究

随着集成电路技术的发展及计算机性能的不断提高，计算机组装结构设计在计算机，总体设计中的地位越来越重要，它直接影响到计算机性能的提高。本文针对一个基于工作站和ＥＵＣＬＩＤ－ＩＳ软件的电子计算机组结构ＣＡＤ系统，从软、硬件平台，系统功能及实现等方面进行了讨论，旨在为电子计算机组装结构设计提供一种强有力的、方便的设计工具，有利于增强国产计算机的市场竞争能力。     

新型联动报警系统

提出对传统报警系统改进的办法:用PC机作为主机,用AT89S52单片机作为从机,采用RS485总线型网络系统。该系统的特点:(1)不仅主机可以呼叫从机,从机在必要时可以主动呼叫主机,避免了从机只能等待主机轮询访问的弊端,从而提高了系统实时性和可靠性;(2)由于报警的时间毕竟很少,因此没有必要让主机无休止地轮询访问各个从机。而且轮询的方式效率很低,主机未必能从多台从机中立刻定位到报警的那台从机。     

Product-Form Synthesis of Queueing Networks

The mathematics of product-form queueing networks has traditionally dealt with the "analysis" of computer systems. That is, the system is assumed to be given and the question of how it performs is answered. In this paper the opposite process of system "synthesis" is dealt with: i.e., we answer the question of what the system topology and parameters should be in order to achieve a given performance objective. Possible research and industry applications range from the hierarchial top-down design of software systems to the management and design of computer installations.     

Wearable computers: Information tool for the twentyfirst century

The wearable computer is a portable computer that is actually worn on the user's body. Ergonomics is therefore a vital feature of its design. Since humans naturally communicate with voice, a wearable computer also responds to the voice. Wearable computers and global wireless networks make it possible to bring exciting capabilities to the individual. Until recently, wearable computer development has been restricted to academic and military laboratories. Now, technological advances and reduced cost have ignited investor excitement about wearable computers. Wearable system applications in manufacturing, logistics, medicine, training, quality control, communications and even entertainment are now becoming widespread. The earliest development of wearable computers occurred in the 1960s. All of the elements of the modern wearable computer were in place in the Eudaemons system for predicting outcome on a roulette wheel. Since then, wearable computer development has paralleled advances in microprocessor technology. After addressing the important distinction between wearable and mobile computers, this paper will look at wearable computers as an information tool for industry. A short history of wearable computers will trace development from the early single application attempts to today's feature-rich systems. A discussion on current and anticipated applications is then followed by an overview of important related technologies. Finally, the paper will assess how wearable computers could impact twentyfirst century industry and society.     

开放式计算机实验室监控管理系统的设计与实现

描述了一套能够监控和管理学生在开放式计算机实验室上机的软件系统的设计原理、总体结构及关键部分的实现.系统实现了自动安排学生上下机,自动检测学生在上机过程中玩电脑游戏并给予警告处理,保证了正常的上机实践教学秩序.系统采用分段管理策略,有效地监控管理分散在不同地方的实验室.     

Gender,Internet and computer attitudes and experiences

It is widely assumed that participation by females on the Internet is hampered by their attitudes towards computers, which in turn is reflective of their attitudes towards new technology. Research generally supports that females have less overall experience with computers and are more likely than males to have negative attitudes towards computers. Although limited, research on Internet experiences and attitudes has found parallel gender differences, with females reporting lower levels of experience and more negative attitudes. This paper explores whether Internet and computer experiences, skills and attitudes are related, using evidence from two studies of incoming college students, in 1989/90 and 1997. There were significant gender differences in many computer experiences and attitudes of incoming students in 1989/90. Males were more experienced with computers, more likely to have taken high school courses requiring computer use, and reported higher skill levels in applications such as programming, games and graphics than females. By 1997, incoming students were more experienced with using a computer than the earlier students. However, gender differences in computer experience and skill levels had diminished in some areas. The 1997 survey also assessed Internet experiences, skills, competence and comfort. Students had more exposure to computers than to the Internet. Males were more experienced and reported higher skill levels with the Internet than females, with the exception of e-mail. The overall competency and comfort level for students in 1997 was significantly higher for computers than for the Internet; 19% of the students did not feel competent and/or comfortable with the computer compared to 36% with the Internet, with females reporting higher levels of incompetence and discomfort for both. Competence and comfort levels with the Internet and computers were highly intercorrelated, and both predicted Internet skills and experiences.     

基于Sniffer技术的教学监控系统的设计与实现

如何实时监控学生机的状态,是机房教学中需要解决的关键问题.根据局域网的工作原理,给出了教学监控系统的结构设计,并通过采用Sniffer技术,实现了实时监视学生的上课行为,包括网上签到、抓取学生的屏幕、查看学生访问的IP、查看学生运行的程序等功能.     

基于SERCOS总线的分布式控制系统设计

SERCOS总线是目前用于数字伺服和传动数据通信的唯一国际标准,具有开放性、兼容性、实时性等优点。本文设计了基于SERCOS总线的分布式控制系统,采用上位机和下位机结构,利用配置了SERCOS接口卡的PC机作为上位机,通过光纤环路向下位机发送指令。下位机由DSP控制器、电机驱动和反馈电路等组成,对电机进行位置闭环控制。实验结果表明,SERCOS总线成功地实现了上位机对电机的实时监控。     

主机和网络设备：分类,产品及其容错问题

本文针对计算机通信网络（计算机网络）中的主机和主要网络设备（包括集线器、路由器和交换机）的大量现有产品，提出了多种分类方法。按不同的分类法对设备进行分类，既有利于深刻理解它们的工作原理，掌握其结构上的特点，又有利于新产品的研制。文章还讨论了提高网络可信性所必须解决的如下容错问题：计算机网络可信性评估与分配、网络节点计算机的容错结构、容错计算机在网络中的应用实例分析、网络软件的实时容错结构以及网络通信协议及其容错机制。     

基于BASCOM-AVR的多路数据采集系统

介绍了一种使用BASCOM-AVR软件仿真平台开发的总线型数据采集系统.包括上位机PC一台和下位机AT89c52若干.上位机通过用LabVIEW设计的软件模板控制下位机进行数据采集和测量.下位机可以单独测量也可以与上位机组成网络进行远程测量.上位机与下位机之间既可通过RS485口通讯,也可以通过USB接口通讯.     

On the development of hierarchial solution strategies for nonlinear finite element formulations

This paper develops a hierarchial type solution scheme which can handle the field equations associated with nonlinear finite element simulations. The overall procedure possesses various levels of application namely degree of freedom, nodal, elemental, substructural as well as global. In particular iteration, updating, assembly and solution control occurs at the various hierarchial levels. Due to the manner of formulation, the degree of matrix inversion depends on the size of the various hierarchial partitioned groups. In this context, degree of freedom partitioning requires no inversion. To benchmark the overall scheme, the results of several numerical examples are presented.     

Assessing the physical loading of wearable computers

Wearable computers enable workers to interact with computer equipment in situations where previously they were unable. Attaching a computer to the body though has an unknown physical effect. This paper reports a methodology for addressing this, by assessing postural effects and the effect of added weight. Using the example of arm-mounted computers (AMCs), the paper shows that adopting a posture to interact with an AMC generates fatiguing levels of stress and a load of 0.54 kg results in increased level of stress and increased rate of fatigue. The paper shows that, due to poor postures adopted when wearing and interacting with computers and the weight of the device attached to the body, one possible outcome for prolonged exposure is the development of musculoskeletal disorders.     

直升机机务训练和故障诊断仿真系统研究

随着仿真技术的发展，在计算机上建立直升机的仿真模型并依据需要模拟各类故障现象已成为可能，因而，可以在虚拟的环境中对机务人员进行系统培训并用计算机来辅助排除直升机故障，该文提出了建立直升机机务训练和故障诊断仿真系统的思想，描述了系统的结构，提出了详细的实现方案，并对其中涉及的关键技术进行了简要分析。     

基于C/S结构的卫星联网寻呼系统的分析与设计

介绍了一个卫星联网寻呼系统的分析与设计过程,给出了该系统的本地计算机网络拓扑结构、卫星联网方案。在设计中,按照客户/服务器体系结构对系统任务进行了划分,并设计了符合TNPP规范的寻呼联网通信协议。     

Hierarchial implicit dynamic least-square solution algorithm

This paper develops an implicit type transient solution strategy which possesses hierarchial levels of application. In particular, due to the manner of formulation, stiffness updating, assembly inversion, solution constraint, as well as iteration are all performed at a localized level. The level of iterative calculations depends on the type of hierarchial partitioning employed, namely degree of freedom, nodal, elemental, material/nonlinear group, substructural, and so on. Since the iterative solution process and application of constraints are applied at a local level, the resulting so-called hierarchial implicit solution algorithm possesses very stable and efficient numerical properties and is highly storage efficient. To demonstrate the scheme, the results of several benchmark examples are presented. These enable comparisons with the Newton-Raphson solved implicit transient solution method. Overall the comparisons illustrate the superior stability and efficiency of the hierarchial scheme.