基于agent的信息融合与信息过滤机制的研究与实现

【作者】 郝彦彬；

【导师】 谷建华；

【作者基本信息】 西北工业大学 ， 计算机应用技术， 2003， 硕士

【摘要】 随着数字电视的逐步普及，面向数字电视的智能化信息服务系统逐渐成为研究的热点。既提供个性化又提供大众化的服务是这种系统的目标，该系统涉及的许多相关领域值得深入研究。 西北工业大学与philips公司合作对面向数字电视的智能化信息服务系统进行了相关研究。在该课题的基础上，本文对面向数字电视的智能化信息服务系统的关键技术，包括信息过滤技术、信息融合技术以及系统的体系结构等方面做了研究，并提出了相应算法，最后利用agent技术实现了原型系统。本文主要的研究工作如下： 研究了信息过滤技术的模型，方法以及相关理论。针对数字电视的智能化信息服务的特点，使用空间向量模型实现系统的信息过滤，提出了负反馈阈值确定法，建立了反馈学习公式，很好地解决了本系统中的信息过滤的实现问题。 研究了信息融合的策略、方法以及相关理论。根据信念修正理论设计了基于总体距离最小的多用户偏好信息的融合算法，该算法满足信念修正理论中带完整性约束的基本公设以及Majority公设。由于利用传统的对称距离概念进行融合计算时，融合结果不能符合人们的通常心理。为此，提出了“不对称距离”的概念。将不对称距离的概念应用到融合算法中，收到了较好的融合效果，更符合人们的通常心理。 提出了面向数字电视的智能化信息服务系统的设计目标和体系结构。利用Agent技术实现了面向数字电视的智能化信息服务系统，该系统具有可扩展性，易移植性和比较高的效率。更多还原

【Abstract】 With popularization of DTV (Digital Television) , DTV-oriented intelligent information service system gradually becomes the focus of research. The system aims at providing both individualized and popular service. Many subjects related to this system deserve to study.Based on the project, the key technologies of the system including information filtering technology and information merging technology are studied in this paper. The architecture of the system is designed and the corresponding algorithm is given as well. At last prototype of the system is realized with Agent technology. The main content of the paper is as follows:Firstly, the model, method and corresponding theory of information filtering are studied. Information filtering is realized by using VSM (Vector Space Model) according to the characteristic of DTV-oriented intelligent information service system. Negtive feedback threshold-obtaining method is brought forward and the feedback learning formulation is established.Secondly, the policy, method and and corresponding theory of information merging are studied. Multiple user preferences information merging algorithm based on total distance minimization is designed according to belief revision theory. The algorithm satisfied IC (Integrity Constraints) postulates and Majority postulate in belief revision theory. Because the calculation result using the traditional symmetry-distance is not fit to human being’s common mentalities, the new concept of asymmetry-distance is brought forward. The better merging result is achieved which is fit to human being’s common mentalities with the concept of asymmetry-distance applied in merging process.Lastly, the design goal and architecture of the DTV-oriented intelligent information service system are put forward. The prototype system is realized with Agent technology applied. The system is efficient and easy to extend and transplant.更多还原