Browsing by Author "Chang, C. K."

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Development of a reading material recommendation system based on a knowledge engineering approach.�
(ELSEVIER, 2010-08-01) Hsu, C. K.; Hwang, G. J.; Chang, C. K.
In a language curriculum, the training of reading ability is one of the most important aspects. Previous studies have shown the importance of assigning proper articles to individual students for training their reading ability; nevertheless, previous experience has also shown the challenges of this issue owing to the complexity of personal factors as well as the diverse properties of the candidate articles to be taken into consideration. This study proposes a knowledge engineering approach for developing reading material recommendation systems by eliciting domain knowledge from multiple experts. Experimental results on 29 senior high school students show that the developed system is able to provide expert-like recommendations to the students by taking preferences and knowledge levels of individual students as well as categories and traits of articles into consideration.
Effects of Video Caption Modes on English Listening Comprehension and Vocabulary Acquisition Using Handheld Devices.�
(International Forum of Educational Technology & Society, 2013-01-01) Hsu, C. K.; Hwang, G. J.; Chang, Y. T.; Chang, C. K.
This study investigates the effects of different display modes of video captions on mobile devices, including non-caption, full-caption, and target-word modes, on the nglish comprehension and vocabulary acquisition of fifth graders. During the one-month experiment, the status of the students' English listening comprehension and vocabulary acquisition was evaluated on a weekly basis. From the experimental results, it was found that the learning achievement of the English target-word group was as good as that of the full-caption group in terms of vocabulary acquisition, while both groups outperformed the non-caption group. When the students’ learning preferences were taken into consideration, the visual style students in both the English target-word group and the full-caption group showed significantly better learning effectiveness in terms of vocabulary acquisition than those in the control group. Furthermore, in terms of listening comprehension, the students in all three groups made remarkable progress.
Effects on learners' performance of using selected and open network resources in a problem-based learning activity.
(British Educational Research Association, 2012-01-01) Hsu, C. K.; Hwang, G. J.; Chuang, C. W.; Chang, C. K.
A Mobile-assisted Synchronously Collaborative Translation-Annotation System for English as a foreign language(EFL) Reading Comprehension.
(Routledge, 2011-03-22) Chang, C. K.; su, C. K
This research introduced mobile devices into an intensive reading course and allowed functions that are usually found only in the language laboratory to be easily and flexibly utilized in the general classroom. To enhance and improve the reading comprehension of English as a foreign language (EFL) readers, a computer-assisted-language-learning (CALL) system for use on PDAs, integrating an instant translation mode, an instant translation annotation mode, and an instant multi-users shared translation annotation function was developed to support a synchronously intensive reading course in the normal classroom. Experiments were conducted to analyze the usage of the system, including the attitude and satisfaction of users. Moreover, the study determined the optimum number of users in each group for the system to work most efficiently, and for students to improve their reading comprehension. Experimental results indicated that those students who were grouped into twos, threes, and fours had significantly higher levels of comprehension than individual students, but those grouped into fives did not. Overall, on average around 70% of the students agreed that the system was useful, 75% of the students agreed that the system was easy to use, and 66% of the students perceived satisfaction with the system. The user intentions were also further analyzed in light of a path analysis method.
A personalized recommendation-based mobile learning approach to improving the reading performance of EFL students.�
(ELSEVIER, 2013-04-01) Hsu, C. K.; Hwang, G. J.; Chang, C. K.
In this paper, a personalized recommendation-based mobile language learning approach is proposed. A mobile learning system has been developed based on the approach by providing a reading material recommendation mechanism for guiding EFL (English as Foreign Language) students to read articles that match their preferences and knowledge levels, and a reading annotation module that enables students to take notes of English vocabulary translations for the reading content in individual or shared annotation mode. To evaluate the effectiveness of the proposed approach, an experiment was conducted on a senior high school English course by assigning three classes of students to two experimental groups and a control group. One experimental group learned with the recommendation system with the individual annotation function, the other experimental group learned with the recommendation system with the shared annotation function, while the students in the control group learned with the individual annotation function, but without the recommendation system. The experimental results show that both experimental groups outperformed the control group, but there was no difference in learning outcome between the two experimental groups in terms of learning achievements.
Providing adequate interactions in online discussion forums using few teaching assistants.�
(TOJET, 2011-01-01) Chang, C. K.; Chen, G. D.; su, C. K.�
In order to encourage students to participate in online learning forums, prompt responses to their questions are essential. To answer students’ online questions, teaching assistants are assigned to manage discussions and answer questions in online learning forums. To minimize the response time, many teaching assistants may be needed to interact with learners. We investigated the trade-off between the request-response time and the cost of labor for handling the requests since this has become a challenging and important issue for education managers. In this study, a queuing-based model is proposed to construct the relationship between response time and the human resource requirement in a learning forum. In addition, an experiment using students in a Computer Science Introduction course at a vocational high school was conducted to verify the model and determine the average number of assistants required so that the students’ questions can be answered within an acceptable time interval, providing valuable information for managing online discussion forums for educational purposes. Finally, the participants’ perceptions were investigated using a questionnaire revised from the Technology Acceptance Model (TAM) in order to identify whether feelings of the perception-of-usefulness and the perception-of-satisfaction during the response wait time showed significant differences when the number of teaching assistants was reduced. The results revealed no significant difference in learners’ perceptions after reducing the number of teaching assistants. It confirms that using the model to predict the umber of required teaching assistants is highly reliable, and effective in reducing labor costs without jeopardizing student satisfaction.