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。     

陶瓷多层布线模块

前言半导体单片集成电路的发展大大地改变了电子计算机的面貌,大面积、超大面积集成电路的研制和生产,为提高计算机性能,为计算机的普及应用提供了必要的前题,而且也对计算机的组装方式提出了新的要求。     

组件计算机

四十年代末期,电子学中的两个重要的新技术:(一)半导体晶体管和(二)电子计算机初露苗头,经十几年的发展已成为互相有关的两个重要科学技术领域和电子工业生产体系。目前,计算机中的主要有源元件是用半导体材料制成的。通过这些年来的实践,人们发现:(一)计算机性能的提高首先要考虑机器的稳定可靠性,计算容量的增大和计算速度的加快;(二)半导体器件的优越性主要是通过半自动化生产技术中工艺的精确性,可重复性及可控制性来实现的;(三)计算机及半导体器件两者的设计的改进是相互制约的,如晶体管线路开关速度的提高受到导线的传输时间所制约;系统的增大受到器件及组装的稳定性、体积及     

高计算密度服务器组装结构分析

随着高计算密度服务器的峰值性能急剧提高,服务器的体积和功耗也急剧增加。因此,高计算密度服务器必须关注组装结构设计,以减小服务器的性能体积比、性能功耗比。根据计算节点板的布局,本文提出将高计算密度服务器的组装结构分为四类,详细描述了正在发展的有背板双面插箱（件）的组装结构;列举了最新的高计算密度服务器系统统的组装结构参数,对各种组装结构进行了分析,并指出了高密度组装的发展趋势。     

组装技术中的电磁兼容

本文简要介绍电磁兼容性技术在电子设备组装结构设计技术中的应用，对电子设备的电磁干扰和干扰源进行了分析，并提出了一些可用于电子设备组装结构设计技术中的电磁兼容性设计方法。这些方法多年来用于多种型号计算机的研究和制造，取得了良好的效果。     

计算机数字控制系统性能评价研究

性能评价对ＣＮＣ系统具有重要意义。本文讨论了计算机性能评价在ＣＮＣ系统中的实现和应用，并结合具体的ＣＮＣ系统，对性能评价的目的、对象、指标、环境以及手段进行了详细论述。     

计算机应用系统的设计与实现

随着电子计算机速度的提高和可靠性的改进以及存贮量的扩大和外设的配套使用,给计算机实时应用系统开辟了广阔的前景。目前,计算机应用系统已经在数据通讯、过程监测、军事工程及事务处理等领域迅速发展,大大提高了工作效率和生产水平,加速了我国四个现代化的进程。 本文以信息传递计算机实时应用系统这一实际课题为背景,阐述了计算机应用系统的设计原理,提出了系统设计各阶段的任务,说明了系统开发的一般方法。本文也讨论了计算机应用软件研制和开发,强调了软件的模块结构设计方法。最后,本文也详细描述了信息传递计算机实时应用系统的具体实现方法及其收到的良好效果。     

分布计算多微处理器数字测图系统

一、前言摄影测量的任务是利用航空和航天摄影资料及立体测图仪器测制地形图。数字测图系统是利用电子计算机建立和解算数学模型以完成测绘地图的目的。现今的数字测图系统基本上由一台容量大、速度快、功能强的电子计算机组成。在实际应用中,这样的系统存在下列缺点: 1) 由于对计算机性能要求高,需要购买价格贵的计算机。     

计算机互连系统中插针干扰的分析

一、引言随着计算机速度的提高和组装密度的增加,使计算机内部信号之间的连接变得更为复杂。要想使所设计的系统发挥出最佳性能,就必须慎重对待工程上的每一个环节。如何降低系统中的干扰,就是需要考虑的重要环节之一。在计算机系统中,电路彼此之间的干扰可能由很多因素造成。底板布线及接插件插针的安排,电源系统及地系统的布局,印制板内部走线及电路分布都是直接影响干扰性能的重要     

LSI对高速计算机组装的影响

现有的高速计算机的一个共同点是必须克服系统环境中的信号传输延迟和负载延迟;如果不提高组装密度,性能增长速度就不能继续提高。故寄希望于LSI在增加组装密度和自身的电路速度上发挥重要作用。然而电路速度和组装密度之间的最佳平衡     

School children's attitudes towards computers as a function of gender, course subjects and availability of home computers

Abstract The attitudes of 328 British Secondary School children towards computers were examined in a cross-sectional survey. Measures of both general attitudes towards computers and affective reactions towards working with computers were examined in relation to the sex of the subject, courses studied (computer related/noncomputer related) and availability of a home computer. A differential pattern of results was observed. With respect to general attitudes towards computers, main effects were found for all three independent variables indicating that more favourable attitudes increased as a function of being male, doing computer courses and having a home computer. In contrast to this, affective reactions to working with computers was primarily related to doing computer courses, such that those doing computer courses reported more positive and less negative reactions. The practical and theoretical implications of these results are discussed.     

Performance based design of high-level language-directed computerarchitectures

This paper is concerned with the analytical modeling of computer architectures to aid in the design of high-level language-directed computer architectures. High-level language-directed computers are computers that execute programs in a high-level language directly. The design procedure of these computers are at best described as being ad hoc. In order to systematize the design procedure, we introduce analytical models of computers that predict the performance of parallel computations on concurrent computers. We model computers as queueing networks and parallel computations as precedence graphs. The models that we propose are simple and lead to computationally efficient procedures of predicting the performance of parallel computations on concurrent computers. We demonstrate the use of these models in the design of high-level language-directed computer architectures.     

Gender differences and similarities in attitudes toward computers

Gender differences among university students in attitudes toward and involvement with computers were examined. Males were found to have taken more computer science courses, to be more knowledgeable about computer languages, to be more likely to want to major in computer science, and to have played video games more than females. There were no gender differences in reported nonvideo-game computer use or in exposure to computers in noncomputer science courses. Males and females did not differ on their reported personal interest in and enjoyment of computers. Consistent with previous research, however, males reported more comfort and confidence with computers and more positive attitudes toward mathematics than did females. Women believed more strongly than men that females should learn and are as capable of learning about computers and science as are males. It appears that these university women were as intrigued by computers as the men were. However, they were apparently somewhat inhibited from the pursuit of specialized training and careers in computer science. This inhibition may be linked to their anxiety about their own skills and to the communication, by male peers, of the attitude that women are less capable than men of learning about computers.     

A data mining technique for discovering distinct patterns of hand signs: implications in user training and computer interface design

Hand signs are considered as one of the important ways to enter information into computers for certain tasks. Computers receive sensor data of hand signs for recognition. When using hand signs as computer inputs, we need to (1) train computer users in the sign language so that their hand signs can be easily recognized by computers, and (2) design the computer interface to avoid the use of confusing signs for improving user input performance and user satisfaction. For user training and computer interface design, it is important to have a knowledge of which signs can be easily recognized by computers and which signs are not distinguishable by computers. This paper presents a data mining technique to discover distinct patterns of hand signs from sensor data. Based on these patterns, we derive a group of indistinguishable signs by computers. Such information can in turn assist in user training and computer interface design.     

A data mining technique for discovering distinct patterns of hand signs: implications in user training and computer interface design

Hand signs are considered as one of the important ways to enter information into computers for certain tasks. Computers receive sensor data of hand signs for recognition. When using hand signs as computer inputs, we need to (1) train computer users in the sign language so that their hand signs can be easily recognized by computers, and (2) design the computer interface to avoid the use of confusing signs for improving user input performance and user satisfaction. For user training and computer interface design, it is important to have a knowledge of which signs can be easily recognized by computers and which signs are not distinguishable by computers. This paper presents a data mining technique to discover distinct patterns of hand signs from sensor data. Based on these patterns, we derive a group of indistinguishable signs by computers. Such information can in turn assist in user training and computer interface design.     

计算机软件的日常管理与维护研究

随着科技的高速发展,计算机已经变得与我们的生活息息相关.而针对于计算机的使用,我们除了了解正确的使用方法,更要明白计算机的日常管理与维护.计算机的软硬件对于计算机而言是不可或缺的两个部分.计算机软件,是指计算机程序中的数据文档和程序.软件是以及计算机及计算机正常运营的重要依据.所以,我们在使用计算机软件的时候,也必须主义对于计算机软件日常管理和维护的进行深入研究.     

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.     

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.     

Gender differences in children's reactions to success and failure with computers

This study examined an attributional style explanation for gender differences in computer use and attitudes. A total of 127 Grade 5 subjects filled out questionnaires assessing computer experience. Surprisingly, there were no gender differences in liking for computers. However, consistent with previous research, boys thought that they had more ability with computers, boys used computers more frequently, and more boys had computers at home. Subjects were then randomly assigned to use either a “failure” computer program, a “success” program, or no program. Results showed that boys provided unstable attributions for failure with the computer (e.g., bad disk, lack of effort) more often than girls did, whereas girls provided unstable attributions for success (e.g., easy program, effort) with the computer more often than boys did. Both boys and girls who made stable attributions for success or unstable attributions for failure were more enthusiastic about using computers in the future, indicating that gender differences in attitudes toward computer use can be explained by gender differences in attributions for performance. The data also suggest that gender differences in relaxation and expectations for improvement were due to gender differences in stability of attributions, frequency of previous computer use, and perceived competence with computers.     

A computer hierarchy structure for electric power utility

This paper presents a layout for a hierarchial computer system structure for electric power utility. The pyramidal control structure or hierarchial computer system is divided into four levels. These levels include: 1) Corporate computer, 2) Factory computers, 3) Center computers, and 4) Cell/Remote computers. The paper also discusses the domain and the components of the proposed structure.