The identifier 2020.oak/4915/2/U-러닝 환경에서 컴퓨터 교육을 위한 교과 교수 ・ 학습 모형 개발.pdf does not correspond to a valid Bitstream in Repository. This may be because of one of the following reasons:
The URL of the current page is incorrect - if you followed a link from outside of Repository it may be mistyped or corrupt.
You entered an invalid ID into a form - please try again.
If you're having problems, or you expected the ID to work, feel free to contact the site administrators.