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退休之后闲来无事,我把这些年来从事科普工作的切身感受写成几篇短文,主要想给搞研究的读者了解实情提供点素材。在科普编辑的编创六艺(编、校、审、写、译、画)中,画画是我的最爱。也许出于天性, 相似文献
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当你任务繁重而时间紧张时,却总有许多与工作无关的杂事:晚餐时来的推销电话,发给户主的直邮广告,尤其是主题为“快速致富”的那些垃圾邮件。 Spam,或称垃圾邮件,是Internet上最令人厌烦的东西之一。随着电子邮件量的增加,收到的垃圾邮件量也在增加。最简单的解决方法就是——甚至不用阅读,只需敲一下Delete键将垃圾邮件删除。但还有更多的方法处理这个问题。 对于初学者来说,可以向你的ISP请求帮助。有三家提供商——EarthLink(www.earthlink.com)、MindSpring 相似文献
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网络世界曾被认为是“江湖”,一是指其变幻无常,凶险与机遇并存;二是指网络世界纵横捭阖,大多出身草根。但是,近年来一批批“国家队”的进入,使得网络世界也出现这样或那样的变数。 相似文献
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瑾瑜 《信息安全与通信保密》2013,(5):26-28
随着移动互联网技术的飞速发展,移动智能系统的逐步成熟,搭载着智能系统的手机、平板电脑大量涌现,于是,智能系统的重要组成部分——APP应用火了。苹果 相似文献
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HDMI是2002年4月由日立、松下、索尼、Thomson(RCA)、TOSHIIA、飞利浦和Silicon Image等共同制订的新一代多媒体接口,它的使命是取代DVD播放机、电视以及视频输出设备的传统接口. 相似文献
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《电子产品维修与制作》2009,(5):15-15
如今,电子邮件已经成为人们互相交流、及时传递信息的重要工具,但僵尸网络横行、欺骗邮件肆虐、70%以上的邮件为垃圾邮件等诸多问题也随之而来。 相似文献
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周光斌 《通信技术政策研究》2004,(2):18-28
分析了垃圾邮件的危害,阐述了“治乱须用重典”的必要性和用高科技手段对付垃圾邮件的重要性,针对我国垃圾邮件的基本状况,提出了我国治理垃圾邮件的相关建议。 相似文献
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The number of electronic mail installations world-wide is growing rapidly, especially in the United States. The paper discusses the need for an international standard for communicating electronic messages and describes the X.400 standard agreed by both the ISO and CCITT for an electronic messaging system. Work going on in the standards bodies to produce extensions to the standard are outlined 相似文献
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描述了在短波信道上进行电子邮件(E-mail)通信的系统构成、提高短波E-mail传输效率的措施、短波E-mail的安全性以及今后的发展趋势等。 相似文献
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目前在很多地方的电信增值业务中,都包含了"语音邮箱"功能.在一些新型的终端设备(如一键通电话)上,已经集成了此功能,但大多数较早的电话机并不具备此功能,因此有客户要求开发一种简单的电话附加装置,以配合这些电话实现语音邮箱指示功能. 相似文献
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Continuing advances in semiconductor memory and microprocessor technology have made possible a class of small, relatively inexpensive, yet electronically sophisticated satellites, referred to as `microsatellites'. In July 1991, Arianespace launched the fifth microsatellite in the University of Surrey's pioneering `UoSAT' series. UoSAT-5 carries a store-and-forward communication payload equipped with a microcomputer, packet-radio interfaces and a 13 Mbyte solid-state storage system, which will provide error-free digital communications to small ground terminals throughout the world. The paper describes the store-and-forward message-switching system and discusses the important considerations encountered when designing advanced computer systems for microsatellites 相似文献
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介绍了语音信箱业务的产生、分析发展、基本原理和组成,阐述了语音信箱业务具备的功能,分析了市场应用及实现的社会效益和经济效益. 相似文献
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A smart boring tool for process control 总被引:6,自引:0,他引:6
A mechatronic metal cutting tool has been developed to improve the accuracy and flexibility of line boring machining in the automotive industry. Laser position sensors and piezoelectric actuator were integrated into the rotating body of the boring tool. To compensate the boring bar droop and effects of cutting forces, a fast tool servo utilizing feedback control of the boring tool insert position was designed and embedded in the rotating tool assembly. In addition to position control, a self-monitoring algorithm that utilizes disturbance estimator has been put together in the controller. Experimental results demonstrated that the developed cutting process controller improves the accuracy of the boring tool as well as reliably detects the process failures, such as tool tip breakage, without additional monitoring equipment. 相似文献
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大型企业邮件系统设计 总被引:1,自引:0,他引:1
对企业邮件系统的需求分析,对邮件系统网络结构包括多种双机模式应用的详细阐述以及邮件系统前后端结构的举例剖析,得出企业邮件系统在稳定性、可靠性、统一企业形象、信息安全等方面拥有巨大的优势. 相似文献
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In the theme park industry, boring means safety and profit. All of the safety systems, distributed E-Stop interface, effect-enable matrix, wind monitoring, extensive fault detection, system self-checks, and more, are all biased to disable the effects if anything unusual happens, It is not enough that the system not notice anything wrong, it must confirm that everything is right before it will enable the effects. 相似文献