摘要
依据多媒体教育资源各层次特征及其关系,通过定义资源媒体特征空间,构建了教育资源库层次索引模型,各层次特征间的映射规则将资源的高层语义特征映射到低层媒体特征,达到了扩充描述语义的目的,提高了查全率;结合学科本体,规范了资源标注内容和用户查询条件的描述,减少了人为因素对查询项和索引项匹配相似度计算的影响,提高了查准率.
The feature-space of multimedia resources was defined. A hiberarchy index model was proposed to reduce the semantic gap by mapping the semantic concept from the domain knowledge ontology to the low-level features. The description of the resources was extended and the recall was improved. Both the annotation of the resources and the query requirement were standardized by the subject ontology. The precision was improved too.
出处
《武汉大学学报（理学版）》
CAS
CSCD
北大核心
2007年第5期553-557,共5页
Journal of Wuhan University:Natural Science Edition
基金
国家高技术研究发展计划(863)项目(2003AA001032
2002AA111010)
关键词
教育资源库
层次索引
模型
学科本体
educational resources database
hiberarchy index
model
subject ontology
