Source︰ Computers & Education Author︰ Chih-Ming Chen , Ching-Ju Chung Date︰ 2008 Reporter ︰ 鍾岳豪

1. Personalized mobile English vocabulary learning systembased on item response theory and learning memory cycle Source︰ Computers & Education Author︰ Chih-Ming Chen , Ching-Ju Chung Date︰ 2008 Reporter ︰ 鍾岳豪

2. Outline • 1. Introduction • 2. System design • 3. Experiments • 4. Conclusions

3. Introduction • Huckin, Haynes, and Coady (1993) indicated that reading ability and vocabulary knowledge are two of the most important components of performance in a second language. • To read English articles fluently, a learner must understand at least 2000 commonly used English words. ● TOEIC 700 UP , need 7000~10000 vocabularies

4. Introduction • Oxford (1990a) pointed out that language learners typically have significant difficulty remembering large vocabularies. The brain when information is learned, gradually disappear over time. • German philosopher Hermann Ebbinghaus (1885). Ebbinghaus, based on experimental results, proposed the forgetting curve.

5. forgetting curve

6. Introduction • Item Response Theory (IRT): It is a widely used theory in education measurement, typically applied in the field of Computerized Adaptive Testing (CAT) (Horward, 1990; Hsu & Sadock, 1985) to select the most suitable items for examinees based on individual abilities. It is a body of theory describing the application of mathematical models to data from questionnaires and tests as a basis for measuring abilities, attitudes, or other variables. (wiki)

7. System design • The client mobile learning system, which consists of three intelligent agents and three databases. ●vocabulary recommendation agent ●learning performance assessment agent ●test agent • support off-line learning ●Data synchronized agent • Test:

8. System design

9. System design

10. System design

11. System design

12. System design

13. System design

14. Experiments • 15 three-year university students who were majoring in the Department of English Teaching at National Hualien University of Education. ●two male and 13 female ● received the two hours PDA training course • Experiments Time: Five weeks ●e-mail to remind • Test:15 multiple-choice questions and 15 cloze questions averagely selected from three vocabulary levels of GEPT in Taiwan.

15. Experiments

16. Experiments

17. Experiments

18. Experiments • Questionnaire analysis: ( questionnaire which involves 18 questions) ● the investigation of the learners’ learning attitude towards using the proposed learning system ● the suggestions from learners’ feedback responses ● self-assessment of learners’ English vocabulary ability

19. Experiments

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21. Experiments

22. Experiments

23. Conclusions • Experimental results demonstrated that most learners believe the review strategy is very helpful when learning English vocabulary. • Personalized mobile English vocabulary learning system facilitates English learning without constraints of time or place by mobile devices.