Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

Abstract: Internet of Things (IoT) and wireless sensor networks (WSN) have significant potential for a wide range of applications. However, these methods are hindered by resource constraints, ...

Abstract: Real-time precipitation retrieval is crucial for timely warnings of extreme weather events such as heavy rain or floods. Geostationary satellite observations combined with machine learning ...