| A Study on Design and Implementation of the Ubiquitous Computing Environment-based Dynamic Smart On/Off-line Learner Tracking Sy Recent countries visiting this post |  |
 | 7 | United States |
 | 2 | |
 | 1 | Russian Federation |
| A Study on Design and Implementation of the Ubiquitous Computing Environment-based Dynamic Smart On/Off-line Learner Tracking Sy Recent countries visiting this post | |
| 7 | United States |
| 2 | |
| 1 | Russian Federation |