Some images are disappearing from the preview. Some of them had a "double extension," but even after correcting them, they still don't appear. These errors are detected in this file. The images with ...

Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

Hi, We are attempting to perform an unattended installation of eXelearning 3.0.1, but it does not install for all users on a computer. We have tried the following parameters with the .exe installer ...