DECnet—DOS不透明任务—任务通信的实现

许多领域对VAX同PC的高速通信都有较大需求,笔者利用DECnet—DOS开发的不透明任务一任务的通信,使MicroVAXⅡ同 Compam 286的数据交换速率可以达到17K字节/秒.本文首先简要介绍DECnet和DECnet—DOS;然后介绍了如何实现不透明任务—任务的通信;最后给出了数据交换速率的测试及结果.     

初尝Mylar——专注任务的编程

在我们的程序开发过程中,也许常会遇到这样的情形：遇到一大堆任务却不知如何着手；工作中时常在不同的视图中反复切换,以致失去方向；你时常痛恨自己工作不集中,效率不高,却毫无办法……。面对这样的情形,有解决方案吗?有,就是Mylar,它为我们提供的解决方案是：专注于任务编程(Task-fo-     

无尽的任务Next——跨时代的网游体验

在去年9月，Sony Online Entertainment（以下均简称SOE）对外曝光了自家知名网游《无尽的任务》（EverOuest，以下均简称为EO）系列最新续作《无尽的任务Next》（Ever Quest Next，以下均简称为EON），其时恰逢暴雪名下超人气网游《魔兽世界》迎来第四部资料片《熊猫人之谜》，此番叫板意味鲜明的举动无疑昭显了SOE对这款作品的满满信心，更成功撩拨起广大玩家对EQN的好奇与期待。千呼万唤始出来，就在不久前，官方高调放出了本作的海量讯息，现在就让我们来一探究竟吧!     

谈谈SIMUL—TASK 386仿真任务

Simul-Task386是UNIX系统的一个实用软件,它提供了一个多任务、多用户的MS-DOS环境。它允许多个MS-DOS和/或者UNIX应用程序同时运行。本软件由两张软盘(1.44兆/盘)的内容构成。它的主要功能有:·支持从UNIX系统命令行中引用MS-DOS命     

DECnet-DOS网络文件访问和任务—任务通信程序开发方法及技巧

在对DECnet-DOS进行分析的基础上,讨论了利用MicrosoftC6.0开发DECnet-DOS透明文件访问和透明任务—任务程序的方法和技巧.     

Eduoffice——帮你方便地完成数字化教学任务

如今,中小学校大都给老师配备了计算机,老师们虽经过一些短暂的学习也只学会了打字和一些最基本的操作,但要完成计算机教学却还有一些难度。为了能让老师们用现有的少量计算机知识完成复杂的数字化教学,洲洋伟业信息技术有限公司开发出了教师专业工具软件——EduOffice。它的最大特点是——针对只会计算机打字的老师,简单操作就能完成数字教案编辑和演示以及数字作业、试卷编辑和批改等工作。比如语文老师授课,把要输入的资料用任意的输入法直接录入到文本区(如图1),选中要标注的文字,点击工具栏中“添加拼音”按钮,所有的字便会自动标注拼…     

基于事件—条件模式的PLC任务描述

介绍了基于事件－条件模式的ＰＬＣ任务描述方法：采用控制任务表（ＣＴＴ：Ｃｏｎｔｒｏｌ Ｔａｓｋ Ｔａｂｌｅ）描述ＰＬＣ控制任务。ＣＴＴ是一种面向控制对象、人－机交互式程序设计方法,方便而直观;ＣＴＴ与目标ＰＬＣ无关,用户选定模型库中ＰＬＣ模型后便可自动将ＣＴＴ转换成目标代码,因而具有很强的通用性,且摆脱了代码调试的麻烦;ＣＴＴ的事件－条件模式的运用网论,进行离线实时图形仿真提供了良好的基础。     

ESDT—HKD系统任务的调度及推理

专家系统开发工具的ＥＳＤＴ－ＨＫＤ是一个通用知识工程语言，它以规则＋框架＋黑板作为系统的知识结构。本文详细地介绍ＥＳＤＴ－ＨＫＤ系统在咨询过程中任务的调度及推理。     

VAX和PC之间任务─任务的通信

本文介绍了ＶＡＸ和ＰＣ之间透明的任务─任务的通信和不透明的任务─任务的通信，以及它们的程序设计方法。     

Advancements of the KUCIM automated flexible manufacturing workstation

Incremental automation, i.e. adding capabilities over time, is an alternative for small mannfacturers to large scale automation projects as a method of achieving automated manufacturing. As an example of incremental automation, the University of Kansas Computer Integrated Manufacturing (KUCIM) workstation has developed over time into an unmanned flexible machining workstation. Presently, the workstation contains a Hurco three-axis milling machine, an American Robot six-axis robot, a Sun 4/260, a versatile fixturing system, an IBM PC-AT compatible computer, and an interface between the milling machine and PC. The control architecture is based on the National Institute for Standards and Technology (NIST) Automated Manufacturing Research Facility (AMRF) manufacturing control hierarchy. The workstation controller employs three software modules: the Supervisor, the Robot Foreman, and the Fixture/Machine Tool Foreman. At the equipment level, two modules are used: the Robot Command Interpreter and the Fixture/Machine Tool Command Interpreter. The three functions that the KUCIM workstation performs to produce parts are: processing an input file, performing tool zeroing and performing machining cycles.     

实现对等通信的软件接口技术

各网络节点之间的对等通信是实现Ｃ／Ｓ应用的基础。在异构网络中需要在不同的网络节点上支持同一种对等通信协议。为此，本文在简要介绍Ｓｕｎ ＯＳ下用ＮＩＴ进行链路层网络存取的方法和ＮｅｔＷａｒｅ ＮｅｔＢＩＯＳ各种包格式的基础上，给出了一种在ＵＮＩＸ工作站上实现的ＮｅｔＢＩＯＳ功能，以支持在ＵＮＩＸ工作站和ＤＯＳ ＰＣ之间用ＮｅｔＢＩＯＳ进行对等通信。     

PC工作站在DWCS软基站中的应用

分布式无线通信系统（Distributed Wireless Communication System,DWCS）是近几年提出的一种新型无线通信体系结构,系统采用网络无线电技术,信号处理和控制模块均在PC工作站中完成.本文结合软件无线电相关技术,研究PC工作站在DWCS基站中的应用.本文将详细分析软基站设计及实现的关键问题,并给出软基站系统的实测性能.     

Performance evaluation of high-speed interconnects using dense communication patterns

We study the performance of high-speed interconnects using a set of communication micro-benchmarks. The goal is to identify certain limiting factors and bottlenecks with these interconnects. Our micro-benchmarks are based on dense communication patterns with different communicating partners and varying degrees of these partners. We tested our micro-benchmarks on five platforms: an IBM system of 68-node 16-way Power3, interconnected by a SP switch2; another IBM system of 264-node 4-way Power PC 604e, interconnected by an SP switch; a Compaq cluster of 128-node 4-way ES40/EV67 processor, interconnected by an Quadrics interconnect; an Intel cluster of 16-node dual-CPU Xeon, interconnected by an Quadrics interconnect; and a cluster of 22-node Sun Ultra Sparc, interconnected by an Ethernet network. Our results show many limitations of these networks including the memory contention within a node as the number of communicating processors increased and the limitations of the network interface for communication between multiple processors of different nodes.     

Design and Implementation of Secure Xenix

Secure Xenix™ is an experimental system designed to run on IBM PC/AT workstations. Like Xenix, it is a Unix™ System V implementation on the PC/AT workstation; unlike Xenix, it eliminates the Unix security deficiencies and it enhances security policies. In this paper, we present the design features of Secure Xenix, their integration within Xenix, and some of the lessons learned from this experiment to date.     

A Bridge from Full-Function to Reduced-Function Workstations

This article describes a system that allows a reduced-function workstation, an Apple Macintosh, to perform as a low-end node in an Apollo Domain workstation network. Programs that run in the Apollo environment do not have to be modified to be accessed from the Macintosh; the appropriate system subroutines are intercepted and recast into a suitable form. Each Apollo workstation can support from two to three Macintosh PCs, making the average cost per console as little as $5000. A similar project is underway for the IBM PC family of computers.     

An interface between the IBM PC/XT and the PAR model 273 potentiostat/galvanostat

An interface between an IBM PC/XT and a Princeton Applied Research (PAR) model 273 Potentiostat/Galvanostat using serial communication is described. Instrument control and data processing are achieved with the ASYST programming language. Data are filtered by the potentiostat with point averaging, and by the microcomputer with software smoothing. An application is presented whereby cholesterol is determined by the amperometric detection of hydrogen peroxide following an enzymatic reaction with cholesterol oxidase.