摘要
介绍了简化EJB(enterprise javabean)开发的最新设计模式,即EJB委派技术;结合EJB委派技术研究了在线测试中抽题组卷策略,提出一种在线自动随机抽题策略(SOREI),即按照题库中"被抽次数"少的题目优先被抽的策略加约束条件来抽题,实验数据表明:该策略所需抽题时间少于传统策略所需抽题时间的1/2左右,随着题库数量的增加,SOREI策略的优势越明显。同时,EJB委派保证了在线抽题的安全性。按照研究的策略,在J2EE平台上,实现了在线抽题组卷系统,并分别在含2 200和5 500道试题的试题库中进行了实验,验证了其合理性和正确性,二者的结合使得在线组卷既保证了效率,又保证了安全性。
The paper introduces the newest method of predigesting EJB, namely the technology of developing EJB delegate. At the same, it researches the strategy of online extracting and assembling subject, and brings forward the algorithm of online random extracting item （SOREI）. The algorithm greatly enhances efficiency of extracting and assembling subjects as well as insures security mechanism. The strategy is designed on J2EE besed on the research. The respective experiment in item-banks including 2 200 items and 5 500 items prove the rationality and the validity of this strategy.
出处
《北京信息科技大学学报（自然科学版）》
2009年第2期71-74,共4页
Journal of Beijing Information Science and Technology University
基金
北京市属市管高校人才强教计划资助(PHR)
