基于B+树的多媒体教育资源层次化索引模型

Hierarchical Index Model of Multimedia Educational Resources Based on B + Tree

为了能够在海量的多媒体教育资源中快速且准确地检索出所需要的部分,提高教育资源利用率,设计一种基于B+树的多媒体教育资源层次化索引模型。首先对多媒体教育资源属性进行判断,并对数值型资源进行标准化和离散化处理,然后利用B+树建立其索引以及索引库,最后设计相应的检索算法,完成资源查找。结果表明:与R树索引模型、四叉树索引模型、多哈希表索引模型、网格索引模型、B-树索引模型相比,所设计的索引模型占据存储空间最小,检索时间最短,NDCG值较高,综合表现好。

In order to quickly and accurately retrieve the needed parts from the massive multimedia educational resources and improve the utilization rate of educational resources,a hierarchical index model of multimedia educational resources based on B + tree is designed.Firstly,the attribute of multimedia education resources is judged,and the numerical resources are standardized and discretized.Then the index and index database are established by using B + tree.Finally,the corresponding retrieval algorithm is designed to complete the resource search.The results show that:compared with R-tree index model,quadtree index model,doha table index model,grid index model,b-tree index model,the designed index model occupies the smallest storage space,the shortest retrieval time,the higher ndcg value,and the better comprehensive performance.