A Study on the Improvements of Elementary Science Digital Textbook for Self-Directed Learning

2016 ◽  
Vol 16 (12) ◽  
pp. 1065-1100
Author(s):  
Hyun-Woo Kim ◽  
◽  
Jihyun Yoon ◽  
Seong-Joo Kang ◽  
◽  
...  
2020 ◽  
Vol 36 (1) ◽  
pp. 1-31
Author(s):  
Yoonhee Ham ◽  
Jinhee Kim ◽  
Sun Young Huh ◽  
Hyeong Jong Han ◽  
Seoyeon Choi

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