集中式应用共享中的模拟键盘操作的实现

介绍基于TCP／IP协议的Windows Socket的组成结构；阐述了利用Windows Socket接口开发网络应用程序的一些方法和技术；结合回调函数，以模拟键盘操作为例，讲述如何实现集中式应用共享。     

一种可红外遥控和定时的智能插座

针对普通插座功能单一,无法遥控及控制通断电时间的问题。设计了一种可红外遥控并通过按键设置在24 h内的任一定时时段自动通、断电的智能插座。该智能插座以STC89C52单片机为核心,外围电路采用键盘、LCD1602液晶显示器及红外遥控模块,实现了远距遥控该插座的通断电,及在预先定时时段的自动通、断电控制,而无需拔掉插头。从而减少了电器的待机损耗,达到智能控制与节能的目的,弥补了普通插座功能的不足。     

Linux下的socket网络编程在STM-1 IMA数据采集卡中的应用

Linux操作系统具有良好的稳定性和出色的网络性能,因此被广泛应用于网络服务领域。而在Linux下开发高性能的网络通讯程序,是充分发挥Linux网络特性的一个关键因素。文章通过对Socket通讯模型的分析和比较,阐述了在数据采集系统中采用Socket通讯技术的必要性,并且以STM-1 IMA数据采集卡为例,详细说明了如何在Linux下利用Socket通讯技术进行网络通讯程序的开发。     

基于CSTA协议的CTI应用

介绍了一种小型客户服务中心的构建方案和相应的软硬件设计结构。方案参照了目前计算机网络和通信网络的接口标准CSTA协议,提出了应用CTI技术建立客户服务中心的可行方案,并和其他模型相比较,探讨其经济性和实用性。     

基于JMF的局域网视频电话(会议)系统开发

局域网（LAN）视频电话（会议）系统有广阔的应用前景,而基于Java实现的应用系统,具有跨平台等诸多优点.本文介绍了实际开发局域网视频电话（会议）系统的基本构成和主要功能,重点描述了服务器客户管理、系统通信控制和客户多媒体处理方案.该系统采用Java多媒体框架（JMF）类库和纯Java编程,界面友好、功能强大.     

市售电源插座安全性的综合分析评判

排插直接关系到电器和用户的用电安全.该文详细阐述了各个品牌的排插在4种安全检测中的表现,只有对排插产品有了全面的了解,才能有效抵制劣质排插,提升用电安全.     

A study on a receiver‐based management scheme of access link resources for QoS‐controllable TCP connections

Although the bandwidth of access networks is rapidly increasing with the latest techniques such as DSL and FTTH, the access link bandwidth remains a bottleneck, especially when users activate multiple network applications simultaneously. Furthermore, since the throughput of a standard TCP connection is dependent on various network parameters, including round‐trip time and packet loss ratio, the access link bandwidth is not shared among the network applications according to the user's demands. In this thesis, we present a new management scheme of access link resources for effective utilization of the access link bandwidth and control of the TCP connection's throughput. Our proposed scheme adjusts the total amount of the receive socket buffer assigned to TCP connections to avoid congestion at the access network, and assigns it to each TCP connection according to characteristics in consideration of QoS. The control objectives of our scheme are (1) to protect short‐lived TCP connections from the bandwidth occupation by long‐lived TCP connections, and (2) to differentiate the throughput of the long‐lived TCP connections according to the upper‐layer application's demands. One of the results obtained from the simulation experiments is that our proposed scheme can reduce the delay of short‐lived document transfer perceived by the receiver host by up to about 90%, while a high utilization of access link bandwidth is maintained. Copyright © 2006 John Wiley & Sons, Ltd.     

基于嵌入式Linux的网络视频点播系统设计

研究设计了一种基于嵌入式的网络音视频点播系统,该系统提供了美观、友好的图形用户界面。视频服务器端通过以太网接口可以与多个客户终端进行点对点的网络连接,客户端利用Qtopia开发设计播放器终端,移植到ARM平台的Linux系统。详细论述了系统设计、硬件设计和软件设计,并实现了远程网络视频的在线点播。     

一种基于组播技术的通信软件的设计与实现

IP组播技术实现了IP网络中点到多点的高效数据传送.因为组播能够有效地节约网络带宽、降低网络负载,所以在实时数据传送、多媒体会议、数据拷贝、游戏和仿真等诸多方面都有广泛的应用.文章简要介绍了组播的基本概念,并阐述了一种基于组播技术的支持多平台的通信软件解决方案.     

An implementation and performance evaluation of kernel‐level RTP supporting the BSD socket API

RTP (Real‐time Transport Protocol) has been designed for efficient transmission of real‐time multimedia data on the Internet by Internet Engineering Task Force (IETF). Different applications tend to implement separate RTPs as a library. In order to resolve this problem, embeddedRTP was proposed as an RTP‐based kernel‐level protocol. This paper proposes the ExtendedERTP protocol based on the embeddedRTP protocol. This new protocol deals with a couple of issues, such as packet processing overhead and buffer requirement, and combines its Application Programming Interface (API) with Berkeley Software Distribution (BSD) socket's which have been widely utilized in network applications. This paper demonstrates that this integration makes it possible to transmit real‐time multimedia data through the existing interface of BSD socket API with nominal extra overhead. This paper also shows that the time and memory requirement for packet processing can be reduced by about 15–20% and by 3.5%, respectively, compared with those of embeddedRTP. Copyright © 2010 John Wiley & Sons, Ltd.