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, ...

The requirement for an object to be surrounded by empty space when imaged by coherent X-ray diffraction was once thought to be a fundamental limitation. A variant of coherent diffractive imaging ...

Abstract: In the last century, engineering advances have transformed the practice of surgery. Keyhole surgical techniques offer a number of advantages over traditional open approaches including less ...