家庭远程控制系统研究

文章采用以STC单片机为控制核心,通过硬件电路和软件编程设计,实现远程用户对家电的远程控制。远程用户电话信号经过振铃检测、模拟摘挂机电路后,双音多频解码芯片将电话线上的DTMF信号解码并传送到单片机,单片机控制语音芯片播放语音提示远程用户通过电话按键输入相应的电器控制信号,控制信号通过电话线送到DTMF解码被单片机识别,单片机控制继电器来控制家电。     

远程通信技术在井下微震监测系统中的应用

利用调制解调器和电话线构成拨号网络,采用Internet Transfer控件编程,实现井下微震监测系统与地面计算机控制中心连接,从而很好地解决了把井下微震监测系统现场采集数据实时传送到地面信息管理系统的技术难题。利用这一技术还可实现在地面控制井下微震监测系统的运行。     

井下微震监测系统中远程串行通讯方案的设计与实现

为适应井下微震监测系统的远程高速传输数据的要求,在分析井下现有通讯设施的基础上,利用调制解调器和电话线构成拨号网络,采用Internet Transfer控件编程,实现井下微震监测系统与地面计算机控制中心连接,解决了把井下微震监测系统现场采集数据实时传送到地面信息管理系统的技术难题,利用这一技术还可实现在地面控制井下微震监测系统的运行。     

A facsimile-based graphics editing system by auxiliary mark recognition

This paper describes a facsimile-based graphics editing system using handwritten mark recognition, and presents some experimental results with the system. In a manner different from usual graphics editors based on CRT displays and data tablets, only facsimiles are used as input and output devices in this system. As the first stage in processing, a graphic subject is first given as a set of line drawings and characters handwritten on a sheet of paper, and it is then input into the computer as a binary picture from a facsimile transmitter. Auxiliary editing information is input into the computer as handwritten marks or seal marks prepared on a separate sheet of paper. As the second stage, the marks are recognized and used to create a mark parameter list for the graphics editing. Third, referencing the mark parameter list, the graphics are expressed by using a set of graphic commands, and edited by the computer. Finally, a correct edited copy of the graphics is constructed by picture processing based on graphic commands, and it is output to a facsimile receiver. Very good results have been obtained for various kinds of hand-written graphics by using the system described here.     

大型设备噪声远程控制系统设计

针对当前对大型设备噪声控制精度偏低,影响设备利用率,提出大型设备噪声远程控制系统设计方法。RFID模块主要实现数据的查询、显示和储存,MFRC522信息采集模块通过读写器发送的电磁波信号与Mifare卡进行信息传递,接收器对Mifare卡信号进行进一步处理,完成译码和解调电路的设计。开关量模块采集电源线电流信号,对系统运行状态进行判断。系统的软件部分通过数据传输方法将设备的各种数据传送到系统的主机,完成设备的噪声远程控制。实验结果表明,所设计系统能够对大型设备噪声进行高效远程控制,保障了大型设备噪声远程控制系统安全稳定的运行。     

基于单片机控制的视频远程传输系统

介绍了以单片机为主处理器、DSP为辅助处理器所设计的、借助于公共电话网传输的视频远程传输系统.     

一个基于IP技术的传真网关的设计与实现

ＩＰ技术正在改变全球的通信方式。Ｉｎｔｅｒｎｅｔ的出现,使得在国际间使用ＩＰ网络作为收发传真的传输媒体成为可能。讨论在ＴＣＰ／ＩＰ协议下一个传真网关的设计框架,并阐述该传真网关系统实现中涉及的一些关键性问题及其解决办法。     

VoIP网关实时网络传真的设计与实现

本文首先说明了网络传真的现状,分析了网络传真的不同实现技术,在SIP协议与T.38规范之间的交互流程还没有完全标准化的情况下,提出了在基于嵌入式Linux操作系统的VoIP网关中,如何通过SIP信令和T.38规范实现传统的PSTN数据传真通信线路与IP网络链路无缝连接方案,从而实现IP网络实时传真。     

计算机集散控制与模块化结构在公用电话集中计费与管理系统中的应用

介绍了一种应用计算机集散控制技术和模块化结构技术的公用电话集中计费管理系统．系统采用了独特的接入网方式，将有人职守的公用电话纳入网络中，利用计算机网络和通信技术，实现了实时和在线的管理．     

Marketing information systems in Fortune 500 companies: a longitudinal analysis of 1980, 1990, and 2000

Soon after the MIS concept was formed in the mid-1960s, the marketing function applied it to its own information needs, creating a formal effort called the marketing information system, or MKIS. This study surveys Fortune 500 companies to reveal their pattern in MKIS usage. The findings are compared to two previous studies a decade apart. It provides a gauge of the evolution of computer use not only in marketing but also in large firms. This study is the first where the marketing managers reported a decrease in the existence of an MKIS in their firms. Nonetheless, the study found that many firms are linking their marketing plans with their information resources. Besides telephone, facsimile, and e-mail, electronic commerce is widely adopted in these large firms. Most importantly, many marketers today are using computers and the Internet. They are more and more knowledgeable about computer technologies and actively taking part in creating computer applications to meet their own information needs.     

基于HPC的远程监护系统研究

针对当前远程监护系统中的一些缺点，作者利用HPC的RAS，网络通信及串行通信功能，结合我国发达的公用电话网，成功地设计并实现了一套可以传输多种生理参数的远程监护系统。     

EPC Gen2系统读卡效率与距离的关系研究

在EPC Gen2系统应用中,发现标签卡与读卡器间的距离对EPC Gen2系统读卡效率影响较大:距离增大使部分标签卡反馈给读卡器的信号变得很弱而无法识别;需要并发识别多张标签卡时,距离增大使反射信号相对较弱的部分标签卡发出的信号更难到达读卡器。对上述问题进行了量化实验,得到如下结果:当标签卡与读卡器间的距离为3 m时,没有出现漏读标签卡的情况,并且读取时间较短;当标签卡与读卡器间的距离为5 m时,出现个别标签卡在2 min内无法读取到的情况。实验结果表明,随着标签卡与读卡器间的距离增大,EPC Gen2系统读卡速率和读取率明显下降,EPC Gen2系统不适用于需要远距离并发识别多张标签卡且可靠性要求较高的场合。     

低压远程载波抄表系统设计与实现

介绍了一种利用现有的低压电力网和公共电话网作为数据采集与传输通道,结合现有单片机技术来实现低压电力线载波远程抄表技术。从系统构成、实现原理、设计方案和实现方法等方面进行了详细的阐述,系统已经成功实现,并在河南郑州、济源、周口等地市使用,抄表成功率在99.8%以上,达到了用户要求。     

实时传真功能在SIP UA端的设计和实现

总结IP传真通信技术,提出一种在SIP UA端实现T.38终端的方法,该T.38终端以SIP作为线路控制信令是一个同时具备T.38网关和T.30传真设备功能的实体.扩展后的SIP UA能和三类传真设备交互,实现实时收发传真功能.     

On the design of human-computer interaction for administrative offices

Abstract

After pilot research in public sector administration offices of the FRG state Baden-Württemberg, the registration and update of personnel data was simulated in an experimental terminal station. The dialogue style was varied: (a) Transaction-oriented: In this mode the data of a complete mask are sent widespread to a host and checked there for input errors. The feedback is then sent back to the terminal, (b) Field-oriented: In this mode the data of every field or character is checked and feedback is sent back immediately. 25 administration officials participated in the trial sessions. They solved real tasks (full case, update) with the different program versions. The experimental data consisted of behaviour registration and interviews about learning, working style and system features. From the results certain design principles were formulated.     

轻量级RFID标签组证明协议

目前,RFID（射频识别）技术已大量应用于物品识别、供应链管理、电子票证等领域。为向第三方证明一组RFID标签已被阅读器同时扫描过,针对低性能标签,提出了一个基于ElGamal加密方案的轻量级RFID标签组证明协议。该协议执行时,阅读器首先与主标签进行认证,然后转发主标签的部分输出信息至标签组中的第一个标签,该标签对输入信息进行哈希运算后,再产生输出信息并由阅读器转发至第二个标签。第二个标签再对输入信息进行哈希运算,其输出再被阅读器转发至第三个标签。此过程重复执行,直至标签组中最后一个标签的输出信息被阅读器转发回主标签。最后,阅读器记录所有标签的输出信息并形成标签组证明,该证明可交由第三方验证。所提出的协议需要阅读器执行ElGamal加密算法,主标签执行轻量级对称加密运算,而标签组中的所有普通标签只需执行哈希运算。经分析,所提出协议满足相应安全要求,且性能优于对比协议。     

远程智能监控系统的设计与实现

设计了一种无线、全方位监控的智能安全系统。以单片机AT89C52、无线传输PT2262/PT2272编解码芯片、双音多频(DTMF)芯片MT8888、模拟电话接口PH8809、语音录放芯片ISD1420为核心,通过公用电话网络进行远程控制和报警。     

基于无线通信网络的G3传真终端的实现

无线通信技术已经广泛应用于社会各个方面,无线传真业务更是扩展了无线通信技术的应用范围。本文介绍了传真业务在CDMA,GSM等无线网络中的实现,设计了基于GSM的无线传真通信规程以及无线传真终端,并通过实验完成了无线传真的接收与发送,收到了满意的效果。     

基于短信息的温度与振动实时监测系统

提出了一种基于手机短信息的温度与振动实时监测系统。该系统利用基于移动网络的手机短信将被监测对象的报警数据实时发送给设备管理人员,从而实现了设备现场信息与管理员之间的双向传递。该系统使得管理人员无需到生产现场就可实现对生产现场设备运行状态的监测与管理。     

A unified messaging system on the Internet

Messaging is an essential aspect of human communication and with the advance in technology and the merging technologies in telecommunications and computers, unified messaging has become very popular. Products that can unify email, voice mail and facsimile are reaching the market. These products will allow users to save time and money and provide them with an efficient way to manage different forms of information. This paper proposes a unified messaging system, UniMail, which is hosted on a PC platform. Access by client is primarily via the web browser with alternative access to voice messages, emails and fax messages by the telephone. A comparison between UniMail and existing unified messaging solutions is also made to provide an insight into the relative strengths of this new system.