Mobile Commerce has staged a remarkable come-back. Driven by the technological innovations in the field of telecommunications, it is showing signs of a healthy recovery. The collapse of the dot-com boom in 2001/2002 had dealt a severe blow not only to Electronic Commerce but also to Mobile...

An internationally harmonized regulation permitting unlicensed transmission in the lower UHF bands is proposed. Such a regulation is expected to create a new market for high range WLAN and digital PMSE devices, closing one of the last gaps of unlicensed wireless communication.

This paper generalizes the approach of Zhou, van den Akker, Werker (2019), which was designed to derive semiparametric power envelope and construct efficient rank-based tests for the univariate unit root testing problem. The generalization is threefold. First, it becomes a unified method...