基于Agent的Jabber即时消息系统研究及其实现

Jabber是一种开放的可扩展即时消息服务(IM)协议。应用Agent风格软件体系结构设计Jabber协议机,通过服务器端Agent构件仿真异构IM客户端,实现异构即时消息传递系统集成,为用户提供透明的跨平台即时消息对等通信服务,给出了基于Web服务模型的Jabber实现。整合到企业信息平台应用系统中的实践表明,Agent软件体系结构Jabber即时消息系统设计先进,具有强大的跨平台功能和实用性。     

即时通信蠕虫研究与发展

随着即时通信(instant messaging)应用的日益广泛和用户数量的迅速增加,即时通信蠕虫(IM蠕虫)的发生频率也相应提高,传播范围变广以及危害程度加深,其正成为网络安全的重要威胁.首先综合论述IM蠕虫的研究概况;然后剖析IM蠕虫的基本定义、功能结构和工作机理以及IM蠕虫与其他网络蠕虫的区别与联系;讨论IM蠕虫的网络拓扑和传播模型;归纳目前防范IM蠕虫的最新技术;最后给出IM蠕虫研究的若干热点问题与展望.     

即时消息交换系统服务器设计与实现

即时消息传递(IM——Instant messaging)是Internet上日渐普及的一种通信方法。当前有许多被使用的IM协议，但它们之间的互通性比较差。为了推动IM的进一步发展，提出了一个针对企业级应用的即时消息交换系统模型，介绍了模型所用的通信协议，并详细讨论了消息服务器的设计和在Windows平台上的具体实现。通过理论分析和实际应用，证明了所做的研究是可行的。     

The role of presence awareness in organizational communication: An exploratory field experiment

Millions of adults currently use instant messaging (IM) in the workplace, and yet there is very little research examining how use and perceptions of this new medium affect intra-organizational communication. While one of the characteristics of instant messaging is the ability to exchange real-time communication, what truly distinguishes instant messaging from other widely adopted forms of mediated communication is the integration of presence technology, which allows parties to detect if others are online and available to communicate. In this paper, we propose a theory of productivity benefits of presence-aware communication technology, building upon past research. Based on this model, we use a quasi-experimental longitudinal research design to test how providing instant messaging to selected workgroups at a Fortune 500 company impacts employees' attitudes and work behavior.

Results suggest that IM use had a positive effect on improving productivity with participants citing reductions in voice mail and phone tag, improvements to how easy it was to see if colleagues were online and available to communicate as well as increased productivity served by back-channel communications conducted via IM. Results and future research directions are discussed.     

即时消息传递系统的安全性

即时消息传递(IM——Installt messaging)是Internet上日渐普及的一种通信方法。在介绍IM系统工作方式的基础上，讨论了当前IM系统由于设计上的脆弱性而导致的各种潜在的安全威胁，对如何保障IM系统的安全提出了一些方法和建议。     

基于DPI技术的IM协议识别系统研究

针对不法分子利用IM协议通信软件泄露国家和企业机密以及传播反动言论的问题,文中在深入研究和分析多种即时通信软件的IM协议的基础上,总结以往IM协议识别系统的缺陷,配合DPI技术的应用设计了一个全新的IM协议检测系统,即基于DPI技术的IM协议识别系统,该系统能够有效地对多种即时通信软件进行识别和监控。通过实验对多种即时通信软件如QQ,fetion,MSN,新浪微博桌面版,googletalk,yahoomsg等的文本信息进行实时监控,验证了该系统对IM协议识别具备极高的识别率以及优越的稳定性。     

即时消息系统的好友关系网络拓扑建模与分析

即时消息系统目前已成为人们交友和沟通的主要工具,建模和理解其中的好友关系网络的建立和演化规律对于设计更加友好的即时消息系统很有益处.针对世界最大的即时消息系统之一的QQ,分析了好友关系网络的特点,统计了QQ用户的交友取向特征,考虑了实际的QQ联系人作为节点的出度和入度情况.不同于传统的基于节点度的优先附着规则,提出了即...     

Towards an open protocol for secure online presence notification

It is important to know the presence of other concurrently online users before real-time communication can be established with them. While many instant messaging (IM) systems are available, there is no standard protocol for online presence notification due to the proprietary nature of such systems. These systems generally have many security weaknesses such as anonymous messaging, message spoofing, account hijacking and authorization overriding because they depend heavily on client-side operations. This paper proposes an open protocol for online presence notification that also provides negotiation support for real-time communication services. The open nature of the protocol promotes interoperability, but demands higher levels of security than proprietary ones. The separation of instant messaging from online presence notification also distinguishes this open protocol from others. Furthermore, a relatively secure presence notification system based on the proposed protocol has been implemented with its performance evaluated.     

Streaming XML with Jabber/XMPP

Jabber is an open alternative to closed instant messaging (IM) and presence services. At its core is the extensible messaging and presence protocol (XMPP), which defines how to stream XML content and is being used to build not only a large open IM network but also a wide range of XML applications. This article provides an overview of Jabber/XMPP protocols and technologies, as well as an introduction to XMPP-based applications.     

SIP视频会议系统中存在服务和即时消息服务的研究

如今即时通信软件和视频会议也开始出现了相互接近和融合的趋势,把即时通信融合到视频会议系统中,这样的系统即可以满足用户的即时通信需求,还可以满足中小型商务、企业和组织用户的视频会议需求。通过介绍分析SIP技术优势以及存在和即时消息服务的实现机制,提出了如何在一般的SIP会议系统中实现存在和即时消息服务。     

基于即时通信技术的群体决策支持系统

群体决策支持系统是一种强调决策者之间通信、协作、交流与知识共享的系统。伴随因特网产生的即时通信技术是增强群体决策支持系统的有效技术。阐述了即时通信技术在群体决策支持系统中的研究与应用。     

Presence technology: more than just instant messaging

Presence technology has long been an integral part of instant messaging. The technology lets users determine if their contacts are online, signed onto their IM applications, and ready to receive messages. This makes IM different from traditional forms of communication, in which users send out messages or calls without knowing whether the recipient is present to receive them. Now, presence technology is starting to appear in numerous programs other than IM. For example, Microsoft is adding presence to Word, Excel, and other applications. In addition, IBM is adding presence capabilities to Lotus Notes 6.5. Thus, for example, when the scheduled starting time for a user's meeting arrives, the system could show people that the user is unavailable.     

基于即时通信的安全保护策略

分析了IM面临的主要安全威胁及其特点,阐述并借鉴了现有的解决方案,提出了一套即时通信(IM)安全保护策略,利用公钥基础设施机制、“安全套接字层”、CAPTCHA等技术,通过加密、签名、验证签名、解密、CAPTCHA验证和IM消息流量监控等方法,保障了IM的连接安全和数据交换安全,保护了IM系统的配置信息和通信记录,减轻了病毒和蠕虫的威胁。     

基于XMPP的即时通信网关应用研究

XMPP最终要实现不同即时通信系统间的互通。主要介绍对XMPP与其他IM互连互通的网关原理及其应用进行的研究讨论,并以jabber系统与MSN Messenger进行互发信息作为实例进行详细阐述。     

信任机制在即时通信系统中的应用研究

即时通信（instant messaging，IM）的发展和广泛应用，极大地改变了人与人之间的信息交流方式，但也带来了一系列新的安全问题。本文首先分析了使用IM系统时存在的安全问题，研究了现有解决方法存在的不足，论述了如何将信任机制应用到IM系统中的设想，从而防止恶意代码传播、身份伪冒和垃圾信息等安全问题，并给出信任模型的建立方法。     

B/S模式下基于Jabber的IM系统的构建方法

传统的即时通信系统大都使用C／S模式,用户需要下载并安装客户端后才可以使用。随着Web技术的发展,人们越来越习惯于使用基于B／S模式的应用来进行工作,而即时通信作为一种方兴未艾的互联网通信服务,如果也能够工作于B／S模式下,必将给人们带来更大的方便。描述了一种B／S模式下的基于Jabber的IM系统的构建方法。通过采用BOSH技术,结合实际校园项目构建了B／S模式下基于Jabber的IM系统。     

一个基于MAS的公共即时通信系统接入方案

企业应用系统接入各公共即时通信系统(IM)的难点在于如何无缝集成这些不同的IM,同时又具有良好的扩展性.提出一个基于多Agent系统(MAS)的接入框架并给出其形式化描述.在这个接入框架中,企业应用系统Agent( EA Agent)负责连接企业应用系统,即时通信系统Agent(IM Agent)负责接入对应的IM,基于黑板模式的消息代理负责EA Agent和IM Agent之间的通信.实际应用验证了该框架的有效性.     

Why shy people use instant messaging: Loneliness and other motives

Existing research suggests shy people may satisfy their affiliation needs through computerized forms of communication such as instant messaging (IM). Fifty-five undergraduates completed an IM use index, the Cheek and Buss (1981) shyness scale and a motives for IM use scale developed for this study. It was found that the strongest motives for IM use were to increase personal contact as opposed to gain social ease or to decrease loneliness. While a direct association between shyness and IM use intensity was not found, shyness was associated with using IM to decrease loneliness in comparison to other motives. It was concluded that shyer people have multiple motives for using IM, but that decreasing loneliness is particularly important for them. Future research could examine how IM and other computerized communications compare to face-to-face interactions between shy and non-shy people.     

IM中一种新的群拓扑结构——三层K叉树

目前一些主流即时通信软件已经嵌入了聊天群，但都过分地依赖中心服务器，使得聊天群的应用受到限制。给出了聊天群的一种新的拓扑结构——三层K叉树，将中心服务器的负载分担到一些选定的即时通信客户端，以减轻中心服务器的负载，增强聊天群的扩展性。分析和仿真结果表明三层K叉树在不降低聊天群性能的情况下确能达到以上目的。