Affiliation: | 1. Graduate Institute of e-Learning Technology, National Hsinchu University of Education, Hsinchu, Taiwan 2. Department of Applied Science, National Hsinchu University of Education, Hsinchu, Taiwan 3. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan 4. Department of Computer Science and Information Engineering, National Central University, Jhongli, Taiwan
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