一种基于情景感知的学习服务发现算法  

E-Learning Services Discovery Algorithm Based on Context Aware

作　　者：朱郑州[1] 

机构地区：[1]北京大学软件与微电子学院,北京100871

出　　处：《计算机科学》2012年第2期132-135,147,共5页Computer Science

基　　金：国家"十一五"重大科技攻关项目(2006BAH02A24-6);国家自然科学基金项目(60803027)资助

摘　　要：针对学习者对e-Learning服务发现系统提供的学习服务不满意或者满意程度不稳定的问题,引入了情景因子,设计了一个学习服务发现算法———eLSDACA。该算法感知学习者的学习情景,形成学习者情景本体,参与服务发现的过程。情景因子有两个作用:一是作为输入和学习者输入同时输入学习服务发现系统;二是作为学习服务发现系统的修正因素,利用修正函数对已发现的发布服务的综合匹配度进行更新,并给出相应的输出。仿真实验表明,在学习者进行学习服务发现的次数超过10时,该算法的查全率和查准率均达到90%以上,优于传统的学习服务发现算法。Based on e-Learning service discovery system,an e-Learning service discovery algorithm-eLSDACA was proposed.The algorithm awares the learning context of learners,and then comes into students context ontology.E-Learning context element is used in 2 aspects.The first is that it is used as input properties.The second is that it is the modification element for the e-Learning service discovery system.With the help of the amendatory function,the total matching degree of discovered advertised e-Learning services is modified.Simulation experiments indicate that this algorithm＇s precision and recall of e-Learning service discovery are all over 90%,and they are all better than the traditional algorithms,after times that learner uses the system to discovery e-Learning service are more than 10.

关 键 词：学习服务 领域本体 服务发现算法 情景感知 修正函数 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]