基于CORBA的移动agent通信模型的设计

移动agent技术是目前比较热门的分布式技术,其通信机制是其重要的组成部分.文中为了解决agent的运行平台和底层通信机制的异构性问题,专门针对移动终端为PDA而提出的基于CORBA的移动agent通信模型.该通信模型屏蔽了运行平台和底层通信机制,能够有效的解决移动agent的通信问题.     

基于Agent分布交互式仿真中数据通信可靠性研究

在视景仿真领域中,基于Agent的分布式仿真系统是重要的研究和应用方向,具有广阔的应用前景。如何实现各个Agent之间的数据通信和数据过滤是分布式仿真中的重要问题。现有的Agent信机制在如何解决多个Agent之间通信的可靠性和同步性上存在一定的不足。该文在详细分析基于消息的通信机制的基础上提出一种新型的主动通信机制,该机制有效的解决了分布式仿真系统中Agent之间的可靠通信问题,最后从理论上给出了该通信机制的可靠性分析及验证。     

基于Agent和XML的普适计算上下文集成框架

普适计算是一种新的计算模式,目的是根据用户需要提供随时随地的服务.为实现这种服务,需要多种设备和软件平台的参与,而这些设备和平台提供的上下文往往是异构且冗余的,不利于上下文信息的访问.设计一个集成框架,以解决以上问题.方法是利用Agent采集底层上下文信息,并将其转换成各种应用程序或中间件能够理解的格式,屏蔽数据异构.在高层,采用Agent技术,并使用XML作为移动Agent通信语言,实现上下文信息的交流,完成上下文的高层集成,解除平台异构,从而简化应用程序的设计,更有效地支持普适服务.     

基于Agent和XML的普适计算上下文集成框架

普适计算是一种新的计算模式,目的是根据用户需要提供随时随地的服务。为实现这种服务,需要多种设备和软件平台的参与,而这些设备和平台提供的上下文往往是异构且冗余的,不利于上下文信息的访问。设计一个集成框架,以解决以上问题。方法是利用Agent采集底层上下文信息,并将其转换成各种应用程序或中间件能够理解的格式,屏蔽数据异构。在高层,采用Agent技术,并使用XML作为移动Agent通信语言,实现上下文信息的交流,完成上下文的高层集成,解除平台异构,从而简化应用程序的设计,更有效地支持普适服务。     

基于Agent的分布式入侵检测系统通信机制设计

分布式环境下的入侵检测系统是入侵检测的研究热点,系统中各Agent运行于不同的平台上,具有不同的数据表达格式,这需要有效的通信机制保障Agent间的通信与协作.本文在入侵检测标准化组织现有文档的基础上,提出了一个具有通用性的分布式入侵检测系统通信机制框架.Agent间的消息交换格式参照IDMEF标准,并根据入侵检测Agent通信需求扩充了警报数据的XML描述.框架还给出了Agent通信安全机制,使通信机制总体上满足了分布式入侵检测系统警报信息量大、实时通信、安全性高的特点.     

基于OPC DA Server的分布式多Agent信息融合机构

为解决过程控制系统的互联互通问题,将OPC技术与分布式Agent理论相结合,提出了一种以OPC数据访问服务器为核心的分布式多Agent信息融合机构。探讨了该信息融合机构的研发策略、实现过程,以及多Agent间的通信机制。     

基于移动Agent的分布式仿真节点间通信机制的研究

本文引入了各类功能各异的移动Agent,提出了一个能够保证移动Agent之间可靠、高效地进行通信的面向消息的主动通信机制,在基于Agent的分布式仿真体系平台上,实现了一个网络性能管理系统。     

基于JADE平台的分布式SYN Flood仿真

针对分布式SYN Flood攻击的特点,采用多Agent的方法对其进行建模仿真。通过构建系统整体框架,分析Agent通信和行为,基于JADE平台构建了一个多Agent的SYN Flood攻击仿真系统,解决了从底层开发该类型的仿真系统存在难度大、周期长的问题,为一些耗时的网络研究提供了一种方法。     

一种高效可靠的移动Agent间通信机制

作为未来分布式系统的一种主流计算模式,移动Agent技术具有广阔的研究前景.协作与通信是移动Agent系统必不可少的组成部分.然而由于Agent的移动性和自主性,现有研究工作所提出的移动Agent间通信机制在可靠性尤其是有效性上存在着一定的不足,如不能够在底层理想地解决通信失效等问题.针对上述问题,设计了一种具有高度自适应性的消息传递机制--EMFS(efficiently message forwarding scheme).该协议在Agent寻址上采取指针寻址和集中式寻址相结合的方式;而对于通信失效的解决则采用了以检测法为主,辅以同步的方法,从而能够在彻底解决通信失效的基础上,较大地提高整个通信系统的性能.此外还对协议的主要参数进行了讨论,从理论上分析比较了EMFS的性能,并给出了模拟实验数据,说明了协议的正确性和高效性.     

基于信息表的移动Agent通信机制

通信是移动Agent必不可少的组成部分.许多研究者针对这一问题进行了深入的研究,并提出了一些移动Agent的通信机制,但是现有的这些通信机制在解决通信失效和消息追逐上都存在着一定的不足.针对这些问题,通过将信息表引入移动Agent的通信机制中,提出一种基于信息表的移动Agent通信机制.在这种通信机制中,把移动Agent要接收的消息按照其特性分为主动消息和被动消息,利用动态改变路标中信息表参数的方法来解决移动Agent之间通信所面临的难题.     

Applying information agent in open bookmark service

As the Web grows, the massive increase in information is placing severe burdens on information retrieval. Automated search engines and information directories with small editorial staffs are unable to keep up with the increasing submissions of Web sites. To address the problem, this article introduces Open Bookmark service based on information agent. In Open Bookmark service, one can record favorite URLs and easily manage them. All the records are stored in a directory-tree, with different types of records in different directories. To perform information filtering, information agents are established to extract the user's profile from his bookmark records, which represent his interests. This makes it possible for personal and active information service. The agents are trained through interaction with the user so as to represent his interests more exactly. Open Bookmark service is also an open framework, in which information agents communicate with each other and exchange valued information. Thus, the quality of information service can be greatly improved.     

Common understanding in a multi-agent system using ontology-guided learning

Traditionally, communication among agents has been established based on the group commitment to a common ontology which is unfortunately often too strong or unrealistic. In the real world of communicating agents, it is preferred to enable agents to exchange information while they keep their own individual ontology. While this assumption makes agents represent their knowledge more independently and give them more flexibility, it also adds to the complexity of communication. We believe that agents can overcome this complexity by using their learning capability. The agents can learn any concept they do not know but want to communicate about with other agents in the multi-agent system where they work in. Our goal in this paper is to present a general method for agents using ontologies to teach each other concepts to improve their communication, and therefore cooperation abilities. In our method, a particular agent that understands a concept only ambiguously intends to learn it by receiving positive and negative examples for that concept from the other agents. Then, utilizing one of the known concept learning methods, the agent learns the concept in question. In case of conflicts in the received set of examples, the learning agent asks other agents again to get involved in the learning process by taking votes. While this method allows agents not to share common ontologies, it enables agents to establish common grounds on the concepts known only by some of them if these common grounds are needed during cooperation. In fact, the learned concepts by an agent are compromised among the views of other agents the method improves the autonomy of agents using them significantly.     

Efficient communication architecture for the C2C agent

In C2C communication, all necessary information must be collected promptly when a buyer and a seller communicate. That is, an intelligent C2C agent is needed to provide information to buyers and sellers. Along with the evolution of computing technology, C2C agents can exploit the efficient delivery capabilities of peer-to-peer (P2P) technology. However, P2P also increases traffic between agents, but communication faults are a fatal problem for C2C business. This study proposes a robust communication architecture based on current P2P content-delivery standards and its efficiency and robustness have been verified from an experiment.     

Extending Answer Sets for Logic Programming Agents

We present systems of logic programming agents (LPAS) to model the interactions between decision-makers while evolving to a conclusion. Such a system consists of a number of agents connected by means of unidirectional communication channels. Agents communicate with each other by passing answer sets obtained by updating the information received from connected agents with their own private information. We introduce a credulous answer set semantics for logic programming agents. As an application, we show how extensive games with perfect information can be conveniently represented as logic programming agent systems, where each agent embodies the reasoning of a game player, such that the equilibria of the game correspond with the semantics agreed upon by the agents in the LPAS.     

Minimal communication in a distributed discrete-event system

This paper deals with distributed discrete-event systems, in which agents (or local sites) are required to communicate in order to perform some specified tasks. Associated with each agent is a finite-state automaton that captures the required tasks to be performed at that site. The problem considered is that each agent must be able to distinguish between the states of its automaton. To help it disambiguate states, an agent uses a combination of direct observation (obtained from sensor readings available to that agent) and communicated information (obtained from sensor readings available to another agent). Since communication may be costly, a strategy to minimize communication between sites is developed. The complexity of the solution reflects the interdependence of the agents' communication protocols. That is, the decision to communicate the occurrence of an event relies on which event sequences are indistinguishable to an agent, which, in turn, is a result of what has already been communicated to that agent.     

A Reliable Communication Protocol for Multiregion Mobile Agent Environments

A mobile agent system is regarded as an attractive technology when developing distributed applications. However, mobility makes it more difficult to trace agents. It is also more complex for agents to communicate with each other in a reliable manner. Therefore, a reliable communication protocol is necessary to control and monitor mobile agents and deliver messages between them. In this paper, a new Reliable Communication Protocol (RCP) is proposed for a multiregion mobile agent computing environment. RCP is implemented on the ODDUGI mobile agent system. Analysis and evaluation show that RCP fulfills the following design goals: reliability, asynchrony, timeliness, location dependency, scalability, and communication cost.     

一种基于OWL的入侵防御Agent通信机制

为了解决基于智能体Agent的分布式入侵防御系统中智能体之间由于语义通信能力差面导致难以沟通和协作等问题，该文设计并实现了一种善于OWL的入侵防御Agent通信机制。通过将OWL语言作为智能体KQML通信语言的内容语言来提高入侵防御系统中智能体Agent之间语义通信的能力。     

移动Agent发送包通信研究

通信是移动Agent系统的关键技术之一。目前为止已有很多相关研究人员提出了一些比较好的通信机制,基本上已经可以满足Agent通信的一些要求。但是如何能有效的实现已提出的机制,这方面的研究还不多。本文提出发送包方法来进行移动agent通信,采用一个HomeServer来记录每个代理的位置和状态信息,HomeServer配有一张事件列表配合每台主机通信平台的SendBox来处理未发送成功的消息。当通信双方驻留在主机上时,通信双方直接通信;当通信双方中有一方在迁移时,则将未发送成功的信息存入发送方通信平台上的SendBox,并在HomeServer的事件列表中增加一条记录,当迁移中的移动代理驻留在某一方的主机上时,由先前发送方平台的SendBox向接收方发送信息。采用发送包方法进行Agent通信能有效地实现位置透明性、异步性、可靠性和降低网络负载。     

基于SSL的Agent安全通信

Agent平台之间通过公共通信设施进行通信。Agent和通信服务协议自身不提供加密和签名等功能,这给Agent的通信带来了威胁。SSL是一种在客户端和服务器端建立安全通道的协议,通过对SSL协议的分析,认为SSL的加密套件与身份认证安全机制可以为Agent平台之间的通信提供安全通道,提出了将SSL协议架设在Agent平台之下通信协议之上的安全通信方案,给出了基于SSL协议的Agent通信代码,保证了Agent平台间的通信安全。