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This study proposed the ubiquitous learning system by finding the difficulties which students have in ∙1 :  ∙ :  ∙ : 2014. 8. 24,  : 2014. 9. 12,  : 2014. 10. 2. *  (Dept. of Computer Science, Inha University) 136 Journal of The Korea Society of Computer and Information October 2014 learning the course of science and analyzing the current learning applications that are used commercially. Through case studies, we found 4 problems. First, the request of long learning time by most of the existing video-based learning applications. Second, it is impossible to know their level of learning due to the lack of open learning contents. Third, it is difficult for learners to participate in interactive learning. Fourth, there are educational contents without considerations on the level of learners. To refine the difficulties due to these problems, we designed and implemented a new ubiquitous learning system which applies the small learning contents for short-term learning, open learning system and enhanced hierarchical learning contents. The system was implemented based on Android. It provides learners with useful science education. We conducted a questionnaire for third grade middle school students in order to show that the proposed system has a good educational effects. The questionnaire asks for the differences between the proposed ubiquitous learning system and the existing learning application. We concluded that the proposed system is better than the existing application by using t-test for improvement of learning effects using feedback with which students participate in interactive learning but not in unidirectional learning, and share the learning result. ▸

Design and Implementation of Android-based Open U-Learning System for Improve Learning Effect : Focusing on 2009 revised science education courses