VC++中UDP通信的实现

WINSOCK是在Windows进行网络通信编程的API接口,也是Windows环境下网络编程的事实标准.UDP是通信中常用的协议,文中给出在VC++中用UDP协议开发网络通讯程序的一个框架模型,以该模型为基础可以开发自己的通信程序.通过实验证明该模型方便易行.     

UDP协议使用与分析研究

UDP协议是一种简洁、高效被广泛使用的协议。首先介绍了一种Windows环境下采用UDP协议的网络通信程序的设计方法,然后采用所设计的程序进行了通信试验。通过Sniffer软件捕获通信过程中的报文,对捕获的报文进行了详细分析,验证了网络模型及所介绍的网络通信程序,总结了UDP协议的优缺点。     

基于UDP协议的点对点语音通信软件设计

基于Windows的低层音频服务、UDP用户数据报协议,开发了一个简单的点对点语音通信程序,介绍了语音通信原理并给出了相关功能的实现代码。     

基于RNDIS协议的虚拟网卡程序实现

微软提出的RNDIS协议使得以太网通信能够在USB总线上传输,而微软在实现RNDIS时使用TCP协议,通信效率不高。为略去TCP三次握手过程,提高RNDIS协议的通信效率,论文在USB2.0协议和RNDIS协议的基础上,介绍了RNDIS协议的结构及其在USB网络设备上的应用,分析了RNDIS协议的通信流程,同时结合USB设备主机,设计并实现了基于Windows Mobile设备的虚拟网卡程序。该程序在LIBUSB无驱设计的基础上,实现了基于UDP协议的RNDIS协议的方法,通过测试证明基于UDP协议的RNDIS协议方法比TCP方式的通信效率更高。     

用Borland C＋＋4.5开发Windows通信程序

在Windows操作系统上开发通信软件时,虽然可利用Windows自身提供的通信设备驱动程序Comm. drv进行程序设计,但其专业化程度较高,程序编制复杂。本文介绍了利用Borland C 4.5开发的Windows通信程序,该程序简单适用,便于传输控制信号,特别适用于控制系统中的检测、监控。     

基于UDP协议的主机与频谱分析仪的无连接通信

本文提出了一种在Lab Windows／CVl开发环境下，通过UDP协议实现主机虚拟面板与频谱分析仪通信的方法。作者介绍了如何在Lab Windows／CVI环境下建立UDP协议，并结合设计的虚拟频谱分析仪软面板，说明如何实时跟踪及显示频谱分析仪的频谱。     

VB中基于TCP和UDP协议的通信编程技术

介绍了TCP和UDP协议的特点,讨论了在VB环境下使用Winsock控件编写TCP和UDP协议通信程序的基本技术与方法,并结合实例给出基本的通信程序。最后,总结了对于不同要求的通信环境选择TCP和UDP协议的依据。     

基于UDP组播的局域网聊天室设计

UDP是通信中常用的协议,本文分析了局域网内基于UDP组播通信的优点,阐述了IP网络上UDP套接字编程技术的概念、特点与原理。对IP组播技术、WinSock控件编程原理进行了研究,探讨了在Visual Studio．net 2005的C#环境中实现基于局域网的聊天室的关键技术和步骤,并给出了相应的实例程序。     

基于Android手机与远程PC的UDP文件传输机制

介绍一种Android手机与PC间文件传输的方法及其实现技术.通过分析Android SDK和Windows SDK中相关API接口,实现Android手机应用软件与PC的Windows软件之间的UDP协议文件传输.该机制在手机端采用Eclipse并运用java语言开发,在PC端采用Visual C++并运用C语言开发,同时在机制中增加了各种改进UDP协议的算法.实验结果表明,该机制提高了UDP协议传输的效率和可靠性,能够很好实现文件在手机与PC间的传输.     

使用VC＋＋4.0为Windows NT开发Socket通信程序

Socket是一个通信端点(endpoint of communication),Socket应用程序使用它通过网络发送和接收数据包。每个Socket拥有一个名字,属于某一运行中的进程并具有某种类型。 Socket分为两类:流式(Stream)Socket和数据报(datagram)Socket。两种类型的区别和说明稍后详述。 Windows Sockets定义了一个二进制兼容的网络编程接口,使用Windows Sockets允许你的应用程序在任何支持Windows Sockets的网络上进行通信。很多网络软件提供商在多种不同的网络协议上支持Windows Sockets,如TCP/IP,XNS,DECNetTM,IPX/SPX。本文讨论是在Windows NT 3.51提供的TCP/IP协议上的Windows Socket编程,与其它任何网络协议支持     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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