求真、务实、共享 

Journal of Second Language Studies（JSLS）于2018年由吴诗玉教授（时任《当代外语研究》副主编）联合John Benjamins负责人Kees Vaes创立，上海交通大学（SJTU）外国语学院主办；John Benjamins出版；历经3年JSLS正式成为ESCI和Scopus检索期刊。

基本信息

外国语言文化论坛 第208讲（西安交通大学外国语学院） 

Foreign Languages and Culture Forum No.208

题目：基于文本挖掘的外语课堂师生话语关联度研究

时间：4 月 15 日（周五）14:00-16:00

地点：腾讯会议 210 711 274

主讲人：吴诗玉

中文摘要

题目：基于文本挖掘的外语课堂师生话语关联度研究

摘要：本研究使用基于R语言的文本挖掘的技术手段，以两个平行班级的完整课堂话语作为研究对象，以单词频率（tf）以及单词的tf-idf值为技术指标，研究课堂话语中各角色话语的关联度，从而探讨外语教师课堂话语的促学问题。研究发现，从单词频率的总体指标看，两个平行班级的师生话语都与参照话语显著相关。但是，从课堂话语中各角色话语所用单词所承载的信息权重看，两个平行班级的师生话语都“离题”了，师生话语并没有触及到他们所学课文中由最重要的词语所定义的核心内容，关联度很低。不过，两个平行班级的教师话语都表现出与学生积极互动并对学生积极反馈的促学特征。

关键词：文本挖掘，课堂话语，词频，信息权重，关联度 

英文摘要

Abstract: Via text mining tools with R, this study investigates the correlates in the English as a foreign language (EFL) student-teacher classroom talk with an attempt to address learning-promotion issues in foreign language classrooms. The teaching materials and the transcripts of conversations in two parallel classes were analyzed through term frequency (tf) and inverse document frequency (tf-idf). It was found that the discourse of both classes was significantly correlated with the baseline discourse (i.e., the teaching materials) at the level of the word frequency. However, zooming in on the term weight of the teacher and student talk through tf-idf, the discourse of both classess howed a low degree of relevance to the teaching materials and deviated from the core contents defined by the most important words of the teaching materials. Nevertheless, the teacher talk in both classes demonstrated some learning-promoting characteristics, such as vigorous student and teacher interaction and instant feedback.

Keywords: text mining, classroom discourse, word frequency, term weight, degree of relevance

Journal of Second Language Studies

总主编：

Boping Yuan | University of Cambridge, UK

执行主编：

Shiyu Wu | Shanghai Jiao Tong University, China

Hui Chang | Shanghai Jiao Tong University, China

助理编辑：

Yanjiang Teng | Michigan State University, USA

The Journal Homepage:

https://benjamins.com/catalog/jsls

Submission Website: 

https://www.editorialmanager.com/jl2s

Email: jsls2016@126.com

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    作者：郭芸伊