移动代理系统的评测基准

移动代理技术已经成为设计、实现分布式应用的一种极具前景的技术,现有许多移动代理系统已经在研究及商业领域得以实现.但是移动代理系统至今仍然没有得到很广泛的应用,其原因除了使用移动代理系统所涉及的安全性问题之外,另一个主要因素就是缺少一个对移动代理系统性能进行量化评价的基准.本文对于现有的能够对各种不同移动代理系统进行量化评测的基准进行综述,并且讨论哪些因素会对移动代理架构性能产生根本的影响.     

一种基于代理技术的分层入侵监测方法

对现有的入侵监测系统做了一些介绍，提出了一个基于移动代理技术来实现入侵监测系统安全的方法．并对此系统的优缺点做了分析，对研究基于移动代理技术的入侵监测系统有一定的指导作用，最后，简单介绍利用代理实现安全的一些方案。     

CORBA和移动代理在电信网络管理中的应用研究

对CORBA和移动代理技术进行了深入研究，在分析了两种网管技术的优势和不足的基础上．提出了一个基于CORBA和移动代理技术的综合网管模型。网管模型利用Java虚拟机作为运行平台．ORB作为底层通信设施，根据网络规模对两种网管模式性能的影响，在不同网管任务中分别使用CORBA对象和移动代理。     

移动代理在网络性能管理中的应用研究

将移动代理技术应用到网络性能管理中,可以在增强性能管理功能的同时提高网络性能和准确性.文章给出了一个基于移动代理的网络性能管理系统Perma,并对该系统进行分析.     

移动代理技术在UMTS系统中的应用

移动代理技术在移动智能网中的应用，是目前移动通信领域研究的热点之一。虚拟归属环境概念的提出为在第三代移动通信系统中应用移动代理技术提供了可能。本在重点介绍移动代理技术的基础上，阐述了移动代理技术在第三代移动通信系统UMTS中的应用：首先必须构造一个分布式的移动代理环境(DAE)，再实现基于移动代理技术的虚拟归属环境，从而完成出入呼叫处理。     

一个用于VPN安全机制的移动代理系统

在虚拟专用网中，提出了一个基于移动代理技术的VPNAgent系统，分析了其体系结构并讨论了实现方法。该系统中的移动代理负责到客户端检测数据，为合法的数据加密和签名。然后护送数据包返回．向工作在防火墙处的静态代理出示签名。静态代理检测该签名，将通过检测的数据包除去签名部分．交与目的主机。实现了虚拟专用网中的合法数据包不必解密即可通过防火墙。     

移动代理安全攻击手段与防止技术分析

移动代理系统的安全问题是制约移动代理技术应用推广的一个重要因素。任何技术和模型的提出都是基于一定的攻击而言的,本文力图从攻击手段和防止技术两方面联系,分析出移动代理安全问题的重点和实质。详细分析了移动代理系统可能受到的攻击,指出了这些攻击的产生原因,并分析了现有的各种移动代理保护技术的实质和对移动代理系统本身的影响,以及目前移动代理安全研究的难点和今后移动代理安全技术研究的方向。     

Mobile Agent技术的应用

随着网络与移动通信技术的发展，Internet技术，分布式对象技术以及移动代理技术等已经得到了广泛的应用，而目前研究比较热门的技术之一就是移动代理技术。移动代理技术是分布式系统的一个新体系结构和实现方法，其应用非常广泛，包括：网络管理、远程设备控制、电子商务、移动计算等等。本文就移动代理技术在应用上的一些优势所展开讨论。     

基于网管应用的移动代理和CORBA性能比较研究

对基于移动代理和CORBA的网管应用分别建立了数学模型和原型系统,对两种分布式技术在网管应用中的性能进行了比较分析。仿真结果表明两种技术的性能比较应综合考虑多种因素。此外,利用移动代理可以实现更为灵活的网络管理机制。     

移动代理技术在Ad Hoc无线网络中的应用研究

Ad Hoc无线网络是一组具有路由和转发功能的移动节点组成的一个多跳的临时性自治系统,是一种无中心的无线网络。现有的主动路由协议或者按需路由协议都不能很好地满足Ad Hoc网络的需要。介绍了Ad Hoc无线移动网络和移动代理技术。在分析了现有的2种路由协议后,提出了在按需路由协议中加入移动代理技术来增强Ad Hoc无线网络的性能。在这些结果的基础上,提出了移动代理通信协议。     

Mobile agents can benefit from standards efforts on interagentcommunication

On the road to the future success of mobile agents, we believe that interagent communication is an issue that has not been adequately addressed by the mobile agents community. Supplementing mobile agents with the ability to interact with other mobile or static agents, or agentified information sources is a necessity in the vastly heterogeneous arena in which mobile agents are called to compete. Thus, an agent communication language should be interpreted as a tool with the capacity to integrate disparate sources of information. We argue that mobile agents can benefit from current standards efforts on agent communication since the focus of such work is to address heterogeneity by defining a “common language” for communicating agents. We discuss ongoing research on agent-to-agent communication and present current standards efforts relevant to agent communication     

可信移动Agent的研究及在分布式网络管理中的应用

为解决分布式网络管理的安全问题,利用移动Agent框架作为底层平台,应用VMC概念将移动Agent和SNMPAgent相融合,构建一种基于可信移动Agent的安全体系结构。实验结果表明,采用此体系结构的网络管理系统能够确保移动Agent的可信性。因此,该体系结构在受到Agent到Agent平台或Agent到Agent攻击情况下的安全性得到评估,证明在网络管理任务中其性能是可信的。     

Applications and design issues for mobile agents in wireless sensor networks

Recently, research interest has increased in the design, development, and deployment of mobile agent systems for high-level inference and surveillance in a wireless sensor network (WSN). Mobile agent systems employ migrating codes to facilitate flexible application re-tasking, local processing, and collaborative signal and information processing. This provides extra flexibility, as well as new capabilities to WSNs in contrast to the conventional WSN operations based on the client-server computing model. In this article we survey the potential applications of mobile agents in WSNs and discuss the key design issues for such applications. We decompose the agent design functionality into four components, that is, architecture, itinerary planning, middleware system design, and agent cooperation. This taxonomy covers low-level to high-level design issues and facilitates the creation of a component-based and efficient mobile agent system for a wide range of applications. With a different realization for each design component, it is expected that flexible trade-offs (e.g., between energy and delay) can be achieved according to specific application requirements.     

Model-based performance evaluation approach for mobile agent systems

Claimed as the next generation programming paradigm, mobile agent technology has attracted extensive interests in recent years. However, up to now, limited research efforts have been devoted to the performance study of mobile agent system and most of these researches focus on agent behavior analysis resulting in that models are hard to apply to mobile agent systems.To bridge the gap, a new performance evaluation model derived from operation mechanisms of mobile agent platforms is proposed. Details are discussed for the design of companion simulation software, which can provide the system performance such as response time of platform to mobile agent. Further investigation is followed on the determination of model parameters. Finally comparison is made between the model-based simulation results and measurement-based real performance of mobile agent systems. The results show that the proposed model and designed software are effective in evaluating performance characteristics of mobile agent systems. The proposed approach can also be considered as the basis of performance analysis for large systems composed of multiple mobile agent platforms.     

A framework for linking distributed simulations using softwareagents

The paper presents the basic ideas behind the use of software agent technology for distributed simulation and data assimilation. A software agent is an autonomous computer program that operates on behalf of someone or something. A mobile agent has the ability to migrate during execution from machine to machine in a heterogeneous network, while a stationary agent executes only on the system on which it began execution. To understand the role of agents in distributed simulation, note that simulations often operate on static datasets and data sources. Many simulations would produce more accurate results if they could access dynamically changing data from other sources, such as sensors or even other simulations. From the perspective of one simulation, other simulations are data resources, producing information possibly relevant to the past, present, or future of the system being modeled. Software agents allow dynamic linking between distributed simulations and efficient monitoring of and access to remote data resources. Specifically, they conserve bandwidth, provide custom operations without precompiling or preloading, and adapt to support disconnected operations. The paper describes the development of a software agent based framework for dynamically linking distributed simulations and other remote data resources. The framework called ABELS (Agent-Based Environment for Linking Simulations) allows independently designed simulations to communicate seamlessly with no a priori knowledge of the details of other simulations and data sources. We discuss our architecture and current implementation developed using the D'Agents mobile agent system     

Building reusable mobile agents for network management

Mobile agents can migrate among nodes to perform a set of management tasks at each of the visited nodes. Existing mobile agent-based network management systems often assume that their mobile agents are designed to work in particular networks to raise the efficiency of agent migration among multiple nodes. Unfortunately, such mobile agents cannot be reused in different networks. This paper proposes a framework where a mobile agent for network management is composed of two kinds of software components, an itinerary part and a behavioral logic part. Both components are implemented as mobile agents. The former is a carrier designed for particular networks, and it can efficiently navigate other mobile agents among nodes in its target network. The latter defines management tasks performed at each node independently of any local network. This framework allows a mobile agent for network management to be reused in various networks without being modified. A prototype implementation of this framework and its application were built on a Java-based mobile agent system.     

Mobile agent security

The agent paradigm is currently attracting much research. A mobile agent is a particular type of agent with the ability to migrate from one host to another, where it can resume its execution. We consider security issues that need to be addressed before multi-agent systems in general, and mobile agents in particular, can be a viable solution for a broad range of commercial applications. This is done by considering the implications of the characteristics given to agents and the general properties of open multi-agent systems. The paper then looks in some more detail at security technology and methods applicable to mobile agent systems.     

基于加密电路构造的移动代理保护安全模型的研究

本文主要讨论保护移动代理免受恶意主机攻击的问题.在指出现有的基于"加密函数"的移动代理保护方法不足的同时作者提出了一种基于可信任元素的安全代理保护模型.这种可信任元素不同于可信任硬件如智能卡和协处理器,它是一种基于加密电路构造的第三方服务称为可信任服务.文中给出了移动代理计算的形式化描述,并说明了纯软件保护方法是不可行的,在介绍完加密电路构造方法后给出了基本模型来说明如何借助于可信任服务实现安全性,并对模型进一步扩充,最后给出应用该模型的一个实例分析.     

Mobile Agents in the Mobile Telephone Network Management

The paper discusses the application of mobile agents in the management of mobile telephone (cellular) networks. We propose the use of mobile agents for collecting subscriber information, such as location area identifier and cell identifier. By using a subscriber profile containing these data the signaling messages caused by location update could be reduced. We also propose a method to improve the quality of network coverage by collecting measurements data by a mobile agent in the mobile station (mobile phone) or at the mobile switching center. By analyzing these data the network provider would be able to discover areas without proper radio signal coverage (black holes), thereby avoiding expensive and time-consuming measurements done by specially equipped vehicles. In addition, we discuss the basic infrastructure requirements for deployment of the mobile agent technology in cellular networks.     

Business-to-Consumer Mobile Agent-Based Internet Commerce System (MAGICS)

We present MAGICS, a mobile agent-based system for supporting business-to-consumer electronic commerce (e-commerce) or mobile commerce (m-commerce) applications. To use the system, consumers first provide their buying requirements to a proxy/agent server through a Web browser or a wireless application protocol (WAP) terminal. Having obtained the requirements, mobile agents are generated to carry out tasks for the consumers including getting offers from merchants, evaluating offers, and even completing purchases. In the case of mobile commerce, consumers can generate a mobile agent to conduct a search and evaluation in the digital marketspace before making a purchase in the physical marketplace. To make it possible to choose an offer that best satisfies the consumer's requirement(s), we present a mathematical model for evaluating multiple decision factors. To test the basic functions of the mobile agent-based Internet commerce system (MAGICS), we have built a prototype system. To minimize the average cost of a product (including the cost of sending agents), we have also developed an analytical model that can determine how many agents should be sent to compare prices. Four different price distributions and some real price information are analyzed based on the model. The analysis provides valuable insights into the design of mobile agent-based shopping applications for m-commerce, in particular, and for e-commerce, in general.