机械结构对两轮移动足球机器人运动精度影响研究

以自行设计的两轮移动足球机器人的机械结构为对象,从理想情况和实际情况分别进行机器人小车的运动学分析与建模,进行比较并得出结论。分析了驱动轮半径对运动学模型的影响。最后从机械结构的设计上讨论了对小车运动精度的影响,并提出相关改进措施。     

论礼貌制约下英文商务信函词汇的选择

礼貌是确保人类顺畅成功交际的基本手段之一,自上世纪七十年代以来引起学术界广泛关注。英文商务信函作为商务交流的一种重要方式,不仅具有传递信息的功能,还担负着建立、加强业务联系的重任,因而对礼貌具有较高要求。本文以Leech的礼貌原则及Brown和Levinson的面子保全论为理论基础,探讨礼貌因素是如何影响,制约不同类型商务信函中词汇的选择的。     

浅议铁路电气化对通信线路和设备的影响与防护

电气化铁路在铁路运输安全中处于重要的地位。从电气化牵弓l供电对通信线路、信号设备影响的原因入手,着重介绍电气化铁路对通信、信号系统干扰的种类,并结合实际和目前现状讨论对通信干扰所采取防护措施。     

基于MT8880-DTMF的数据采集远程传输系统的设计

本文介绍DTMF收发控制器MT8880的结构特性,设计了基于DTMF的数据采集远程传输系统。由MT8880与单片机80C51组成数据采集远程DTMF传输系统,可应用于遥测遥控领域。文中介绍了80C51与MT8880的硬件接口和收发数据通信的程序设计。     

计算机实验室管理系统安全策略探讨

本文讨论了计算机实验室管理系统中安全方面存在的问题，并从服务器安全、网络安全、数据通信安全和数据库安全等几个方面进行了分析研究，提出了防止计算机实验室管理系统中数据被非法窃取、篡改的几种安全措施，消除了计算机实验室管理系统中潜在的安全隐患问题。     

支持手机检索的技术方案

随着手机的日益普及,人们越来越希望能利用手机从Internet获取各种信息,本文介绍了满足这一需要的两种技术方案。     

基于无线通信设备防雷措施的思考

目前,无线通信已经被广泛应用于许多领域.但是由于雷电的危害,无线通信设备时刻都处在危险当中.本文探讨了无线通信设备的防雷措施.     

基于J2ME的一款手机游戏的实现

Java应用程序产生的手机增值服务逐渐体现出不可估量的影响力。它对丰富人们的生活内容、提供快捷的资讯起着不可忽视的作用,特别是手机性能的逐渐增强,使得手机作为一个游戏平台越来越成熟。     

On Politeness in Classroom Conversational Communication

To make effective communication,Politeness Principle has become an important part in the research of pragmatics.So politeness can first of all be considered as a phenomenon,an observable social phenomenon.According to the Cooperative Principle put forward by Grice,the users of language in communication usually have the desire to cooperate with each other and observe the four maxims of good communicative behavior:Quality Maxim,Quantity Maxim,Relation Maxim,and Manner Maxim.However,people often violate these maxims intentionally,expressing themselves in an indirect way to convey the intended meaning.It is mainly for politeness that speakers tend to talk indirectly.Therefore,I intend to explore how to adopt proper politeness strategies and use English polite language appropriately to make communication successful,especially in classroom daily communication.     

Tocqueville in Cyberspace: Using the Internet for Citizen Associations

Political theorists like Alexis de Tocqueville have long recognized the importance of citizen associations for the practice of democracy. Through participation in associations, citizens both receive an education in public affairs and create centers of political power independent of the state. Essential to participation in an association is participation in a forum, a communication space that allows for many-to-many communication in which citizens can "treat of public affairs in public" (Tocqueville, 1945, p. 109). Participation in forums suffers from numerous barriers, however, such as the need to meet in one common place, the need to meet at one common time, and the potentially high costs of participation. Online forums on the Internet avoid many of these barriers, and thus they hold the promise of facilitating the formation and operation of citizen associations. This was confirmed in 1995 by the experiences of a Boston-based citizen association, the Telecommunication Policy Roundtable-Northeast (TPR-NE). TPR-NE's uses of the Internet suggest that online forums may allow associations to be more responsive, more robust, and able to unite more members.