SECCL-based research on prefabricated chunks in achieving oral English fluency

Fluency on oral English has always been the goal of Chinese English learners. Language corpuses offer great convenience to language researches. Prefabricated chunks are a great help for learners to achieve oral English fluency. With the help of computer software, chunks in SECCL are categorized. The conclusion is in the process of chunks acquiring, emphasis should be on content-related chunks, especially specific topic-related ones. One effective way to gain topic-related chunks is to build topic-related English corpus of native speakers.

英语专业四级口试的效度研究

本研究通过收集内容相关性与标准关联性两方面的证据,检验了2007年全国英语专业四级口语测试的效度。就内容相关性证据而言,三项口试任务符合《大纲》要求,具有交际价值;三项任务之间的相关系数中度偏强,但因子分析结果表明三项任务仍旧是3个独立因子;就标准关联性而言,某重点高校62名英语专业学生2007年的口试成绩能够解释其当年四级笔试成绩中58.5%的差异性。依据这两方面的证据,可以断定2007年全国英语专业四级口试具有较高的效度。

基于视觉内容语义相关度的图像标签自动排序方法

提出一种基于视觉内容语义相关度的图像标签自动排序方法.该方法按照标签与图像内容的语义相关程度对网络共享图像的标签进行排序.首先,算法基于贝叶斯理论给出标签与图像内容语义相关度计算的概率表述.然后,融合多种视觉特征以实现对不同语义的标签与图像内容相关度概率的准确估计,具有较高的可扩展性.实验数据采用149 915幅Flickr网站下载图像,实验结果验证了本文方法的有效性.

基于概念的视频检索中概念语义匹配算法研究

为了实现基于概念视频检索中从底层内容到查询的语义贯通,应用基于WordNet词典的语义相似度算法,通过对三种不同原理的算法对比应用,得出基于信息量算法在本应用中更有优势,语义匹配可以提高检索精度,最优映射数目为2至3个,以及在目前发展水平下,映射到合适的概念比检测器精度更合适四个重要结论.

A Study on Human-Computer Interaction Mechanism in an Intelligent Tutoring System

Discussion is a common and important learning process.Involvement of a virtual agent can provide adaptive support for the discussion process.Argumen-tative knowledge construction is beneficial to learners’acquisition of knowledge,but the effectiveness of argumentative scaffolding in existing studies is not consistent.Based on an intelligent discussion system,a total of 47 undergraduate students took part in the experiment and they were assigned to three different conditions:content-related plus content-independent scaffolding condition,content-related scaffolding condition,and the control condition.Under the content-related and content-independent scaffolding condition,the computer agent provided an idea from semantically different categories(content-related scaffolding)according to the automatic categorization of the current contributions,and further inquired the participants about their attitudes and reasons(content-independent scaffolding).Under the condition of content-related scaffolding condition,the virtual agent only provided semantically different viewpoints.Under the control condition,the subjects expressed their opinion independently without the participation of the virtual agent.Findings revealed that compared with the control group,when the virtual agent provided semantically different ideas(content-related scaffolding),the discussion breadth(number of categories)was improved and the subjects felt that they had a more comprehensive understanding of the problem.Compared with the content-related scaffolding condition,when the virtual agent provided semantically different ideas and further asked about the attitudes and reasons,the subjects expressed more agreement with these views,but mentioned fewer categories during the discussion.This study suggests that the content-related scaffolding can facilitate the cognitive processing effect relevant to the topic of discussion.When the content independent scaffolding is added,it can promote the argumentative processing,but may have a negative effect on the cognitive processing related to the topic discussed.

多元化测量方法的内涵和理论视角:对内容效度的考查

目前有关企业多元化的实证文章使用和选择多元化测量指标时,大多忽略了所要测量的多元化概念与其测量方法之间的逻辑关系,导致测量方法存在着内容效度的问题。本文试图理清目前各种多元化测量方法所对应的多元化内涵。系统地分析表明,不同的多元化测量方法不仅其内涵不同,而且其所考察的对象和背后的理论视角均不同。因此,本文建议以后的多元化研究应该根据其理论视角以及研究的问题选择合适的多元化测量方法,而非简单采用目前常用的熵指数法。