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, ...

Within each content area, there are one or more tutorials. Each tutorial consists of lessons. Each lesson should be a page detailing the concept being taught, along with sample code. Lesson and page ...

Hob3l is a command line tool for reading SCAD files and writing STL files for 3D printing. The focus is on speed and robustness. OpenSCAD can convert SCAD to STL, too, but it is very slow, because it ...