E-learning环境下的异步答疑系统的研究(英文)

The Research of Supporting Platform of Asynchronous Q&A for E-learning

目前E-learning环境下常用的异步答疑算法存在实现复杂、时间代价消耗高的问题,介绍了基于答案的关键字和权值进行信息检索的算法.使用此算法,教师不仅能够为学习者提供文本资料,还可以提供其他的比如视频、音频和图片等资料,教师只需要为相应的答案提供一些参考关键字和设定权值即可.因为学习者抽取答案的关键字的能力是有限的,由教师来做此工作更加合适.试验证明此算法实现容易,查找效率高,能够较好地满足E-learn-ing环境下的异步答疑的需求.

Aimed at the problems of great complexity of retrieval algorithms and high cost of time consumption in asynchronous question and answer（Q＆A） system for E-learning, the reversal retrieval algorithm based on answers＇ keywords and weight values is put forward to solve it. By using this algorithm, the authors can present not only texts for learners, but also other format materials, such as audio, video and images, etc, which only needs authors to offer keywords and weights just like texts. Because learners＇ ability to extract keywords from natural language is limited, it will be advisable to let authors offer keywords and weights for answers. In addition, a supporting platform of asynchronous Q＆A for E-learning has been designed and developed, which employs the algorithm proposed, and the operational results of platform have proved that the reversal retrieval algorithm is simple, easy to operate and runs with great efficiency and speed ,and can satisfy the requirements of retrieval answers in asynchronous Q＆A system well.