【作者】 王涛；

【导师】 徐宝祥；

【作者基本信息】 吉林大学 ， 情报学， 2007， 硕士

【摘要】 随着网络技术的快速发展,传统的网络信息检索技术的缺点明显地暴露出来。如何解决网络信息检索技术存在的问题被提上了日程。本文分析了传统的网络信息检索技术的特点、分类、体系结构及其关键技术等,指出了其存在的不足。概要介绍了分布式人工智能领域的移动智能体技术的基本理论及其技术优势。在此基础上,提出了一种解决传统网络信息检索技术缺陷的新思想——将移动智能体技术引入网络信息检索领域中,构建基于移动智能体的网络信息检索系统。论文在构建了基于移动智能体的网络信息检索系统的系统模型后,对其运行机制进行了详细的阐述,并给出一个基于Aglet平台上的开发实例。对于系统中的几个非常关键的技术,本文也给出了详细的介绍。论文的最后给出了对本文研究成果的简单总结,并对下一步的研究工作进行了展望。更多还原

【Abstract】 With the web information retrieval technology’s running to today, it has indubitably brought large convenience to the information user. However, with the development of network and web technology, the web environment has grown up increasingly, the traditional web information retrieval technology couldn’t meet the demand of information user yet. It has shown itself a good many defects, especially under the distributed web environment, that is: The traditional web information retrieval technology takes two kinds of mode essentially which is client/server or code-on-demand mode, under these two kinds of mode, the web information retrieval takes too many network bandwidth, the network’s flux is too heavy, and it relies on the network connections’stability excessively; It can’t guarantee the information retrieval’s efficiency; The information retrieval’s intelligence degree is too low; It lacks of the self learning ability and so on. Traditional web information retrieval technology shows itself the above defects, so how to resolve these problems becomes a very imminency problem in the correlative areas, the researches of this thesis just expands based on this problem.Mobile agent technology is a new technology in the distribute artificial intelligence area, it is an application branch of the agent technology and springs up not for long. At present, the definition of mobile agent is not unitive, different application environment gives it a different definition. Synthetically, this thesis consider mobile agent a kind of agent which has the mobility, it can move from one computer to another independently, it fulfill the user’s appointed assignment. The mobile agent technology’s rise is not for long and is not very mature, but its application experience in many areas shows that mobile agent technology has a very powerful technical dominance and application foreground, its technical dominance is that: mobile agent technology can reduce the network load, save the network bandwidth; it sustains long-distance alternation; encapsulate network protocol; sustains asynchrony independent execution; it sustains not-on-line computation; it doesn’t depend on the flat roof and has the dynamic adaptability; it is prone to distribute services and it can buildup the muscularity and fault-tolerant ability of the system; it can provide individual services and so on. These advantages of mobile agent technology make it have a very wide application foreground. It is also this technology’s rise provides a new way for the problems of the web information retrieval technology in this thesis.The researches in this thesis expand by surrounding the problem how to solve the defects in the traditional web information retrieval technology, it has creativity to import the mobile agent technology in the DAI to the web information retrieval area, it tries to resolve the problems in the web information retrieval area by this new technology, this is a kind of trialed research and is an innovation of this thesis.After analyzing the defects of the traditional web information retrieval technology and introducing for the mobile agent technology, this thesis integrates these two technologies, and constructs a web information retrieval system model based on mobile agent, this is a production of the thesis. This system model has four layers, those are application layer, agent layer, system flat roof layer and network layer, each layer has its application respectively. In this process, the thesis has introduced the main module’s structure, principle and function amply, including mobile agent server, retrieval mobile agent, service agent, web service agent and yellow page server. Above this foundation, the thesis expatiates the system’s executing mechanism. Theoretic research must have a demonstrative research to support. Accordingly, this thesis gave a example which is a web information retrieval system based on IBM’s Aglet platform, expatiated the realization of main module on the Aglet platform. At last, the thesis introduced several key issues in the system, it includes the agent’s mobility, communication mechanism, the system’s fault-tolerant mechanism, its security and so on.Make a comprehensive view for this thesis, this thesis imported the mobile agent technology to the web information retrieval area aim at its defects, gave a new resolved precept which is web information retrieval technology based on mobile agent. This new precept can resolve the problem in traditional web information retrieval technology and have a lot of technical dominance, such as dynamic executing, asynchronous computing, choosing route independently and parallel searching. Thereby, this precept’s putting forward certainly will promote the mobile agent technology’s rapid development in the web information retrieval technology, at the same time, it made this research have both academic significance and practical significance. The penman believes that this created research certainly will arouse the attention for it in the relative academic area, and will raise the research upsurge for it, this research will promote the web information retrieval technology’s development rapidly and much better, make it undergo the essential changing.更多还原