信息共享联盟模型研究及其在农业领域的应用

本文提出了一种信息共享联盟模型UIS,对模型的结构、功能框架以及相关核心技术,包括异构数据库的标准化处理、URI远程访问技术、快速查询算法等进行了详细讨论.UIS的一个重要特点是:在逻辑上将各个信息资源的异构数据连接在一起,在物理上则对加盟数据按照元数据规范标准进行整合,并备份上传至联盟.该模型通过多主体协作,能够有效地整合异构、分散的数据库,实现信息资源的有效共享和有效检索.模型服务提供了多种模式的信息检索接口.对于已经共享的多媒体资源,通过引入颌域专家的知识问答命题来引导用户的学习,由此实现了教与学之间的互动,提高用户的学习质量.目前UIS已在中国农村科技信息网中进行实验和应用,实现了包括位于北京的"中国现代农业科技信息共享示范网"、"九亿网"、"国家农业科技园区网"等多家网站在内的数据库资源的信息共享,并且在河北省进行了试点,初步建立了中国农业信息共享联盟体系.

The Research on the Model of Union of Information Sharing and its Application in the Agriculture

In this paper,a model of UIS(Union of Information Sharing)is proposed,which can efficiently integrate and share heterogeneous databases geographically distributed and resided in different environments with the multi-agent cooperation.We present the structure and major components of this model,including standardization of heterogeneous databases,URI remote accessing,efficient query,and natural language interface.Based on the multimedia resources which have been shared,the model service introduces expertise''s knowledge question-answer proposition to guide user''s study.And the statistical analysis of the users'' answer in their study will also react to the expertise''s further proposition.As a result,this service will reach the interaction between the teaching and learning and finally enhance the user''s study efficiency and the study quality.At present,the whole system is implemented and applied in the area of agricultural information sharing,and currently contains databases from several Websites.