VMS DCL命令的最简输入方法

本文给出了在VAX/VMS上用键定义设施和主谓模式实现的一种最简命令输入方法,它能极大地提高计算机系统的利用率和程序员的工作效率。文中给出了全部程序列表和一个应用实例。     

fsh—A functional unix command interpreter

Command interpreters under the UNIX operating system typically employ the syntax and semantics of imperative programming languages. Many of the advantages that functional programming languages hold over imperative languages can be incorporated in a functional command interpreter. Unfortunately, functional command interpreters to date have used the syntax of Backus's FP. The advantages of command expressiveness and composition have not been appreciated. A powerful functional command interpreter, fsh, that overcomes many of the deterrents of previous functional command interpreters is presented. Much of the unnecessary complexity of existing UNIX command interpreters is avoided by following the functional paradigm. fsh has been implemented under the UNIX 4.2BSD and System V operating systems.     

From ethnographic record to system design

This paper explores the issues involved in moving from ethnographic explorations of work in context to a practical contribution to system design. It does so using the example of an interdisciplinary research project involving sociologists and computer scientists in the domain of air traffic control systems. It forms a pair with another paper (Sommerville et al., 1992) exploring these questions from the perspective of our computer science partners. We characterise ethnography as a research method, and consider the differences between undertaking it for strictly sociological or anthropological purposes by contrast with interdisciplinary and design purposes. We summarise some of our results in ethnographic explications of the work of air traffic controllers, and the sociality which it manifests. We describe the dialogues involved in rendering these observations informative for systems design, and the mutual translations implied in attempting to reconcile sociological with software engineering questions about supporting the work. We conclude by specifying some features of cooperative work which an engineering approach is in danger of overlooking; the ways, and limits, in which ethnographers can form a bridge between users and designers; and some of the conflicts of interest entrained in generating technical change.The research is funded by the UK MRC/SERC/ESRC Cognitive Science/HCI Initiative with the title Social Analysis of Control Systems for HCI Design, grant number SPG 8931598. The computer science partners are Professor Ian Sommerville, Dr Tom Rodden, Dr Pete Sawyer and Mr Richard Bentley. Thanks are due to Val King, Kjeldt Schmidt, Ian Sommerville and Tom Rodden for very helpful comments on earlier drafts of this paper.     

浅析在VB中使用ADO开发数据库应用程序

本文解析如何通过ADO对象对数据库进行操作,并介绍了ADO对象群中的几个重要对象Connection、Recordset、Command等。     

飞腾平台中硬件数据压缩的驱动设计与实现

数据压缩是有效处理大数据的关键技术,在飞腾处理器平台上基于zlib库的数据压缩通常采用软件的方式实现,在数据处理量大而且实时性要求较高的情况下,已经难以满足需求。针对这个问题,通过研究zlib编程函数库,结合飞腾处理器的特性,完成了飞腾平台中硬件数据压缩的驱动设计与实现,其中提出了双向DMA传输技术和基于一致性内存的命令环机制,从而进一步提高了基于硬件的数据压缩的效率。通过实验证实了飞腾平台中采用硬件数据压缩改进的有效性。     

国产化计算平台在指挥控制系统中的应用研究

本文阐述了国产化计算平台的概念及主要组成,提出了国产化计算平台在指挥控制系统中的应用设想。最后给出了基于国产化计算平台研发的小型化多雷达点迹航迹混合融合处理设备的设计实现和实际运行效果,验证了本文提出的应用设想。     

乘法器复用技术在滑窗FIR滤波处理中的运用

随着超大规模集成电路的飞速发展,FPGA集成的硬件乘法器越来越多,内核时钟越来越快,使得FPGA在实时信号处理中得到广泛应用。介绍了FIR滤波运算的原理与硬件处理结构,通过乘法器的复用技术,解决了实现滑窗FIR滤波处理时,FPGA内部乘法器的高速运算与外部慢速数据率之间的矛盾。     

RUNA: a multimodal command language for home robot users

This article describes a multimodal command language for home robot users, and a robot system which interprets users’ messages in the language through microphones, visual and tactile sensors, and control buttons. The command language comprises a set of grammar rules, a lexicon, and nonverbal events detected in hand gestures, readings of tactile sensors attached to the robots, and buttons on the controllers in the users’ hands. Prototype humanoid systems which immediately execute commands in the language are also presented, along with preliminary experiments of faceto-face interactions and teleoperations. Subjects unfamiliar with the language were able to command humanoids and complete their tasks with brief documents at hand, given a short demonstration beforehand. The command understanding system operating on PCs responded to multimodal commands without significant delay. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

僵尸网络命令控制机制与检测技术分析

作为攻击者手中一个强有力的攻击平台,僵尸网络为攻击者提供了灵活、高效并且隐蔽的控制和攻击方式。僵尸网络是网络安全领域所关注的重要威胁之一,对我国网络安全的危害尤其严重。首先介绍了僵尸网络的结构和工作机制,然后着重分析了其命令与控制机制,并针对各种命令与控制机制介绍了当前检测僵尸网络的技术和方法。     

利用.Net封装对LDAP目录的访问

活动目录是一种包含服务功能的目录,它是一种数据库,它的目录或数据库的结构类似于UNIX文件系统,具有良好的可扩展性。对活动目录访问通常利用LDAP(轻量级目录访问协议)。一般开发人员直接访问LDAP目录不仅编程难度大,而且造成大量重复性工作,浪费资源。本文运用了·net中访问LDAP目录的相关技术,结合作者在实际项目中的经验,根据LDAP目录树-叶型结构的特点,从子目录节点和用户节点两方面封装了对LDAP目录的访问。利用该封装类访问LDAP目录,降低了一般开发人员的开发难度,同时简化了代码,节省了资源。