Brillouin precursors propagation through sea water at GHz frequency

Abstract

Precursor fields in lossy Debye media have been shown to have a sub-exponential attenuation rate, thus they are good candidates for underwater communications. In this paper, we investigate the propagation of Brillouin precursors through sea water with static conductivity using the dielectric models proposed by Meissner and Wentz. A fast-Fourier-transform method is used to analyze the peak amplitude decay and pulse broadening related to the precursor. The sea water salinity considered is between 25 and 50 ppt. The performance is evaluated at frequencies between 1GHz and 32GHz, as they have been allocated for short distance underwater communications.

Identity driven capability based access control (ICAC) scheme for the Internet of Things

“…Recent NIST [7] gives detailed assessment of all access control approaches but beside these established approaches, there are several applications and scenario specific access control schemes have been developed. Extended role based access control model for IoT by incorporating the context information is presented in [8]. In [8], authors have considered IoT users rather than device.…”

“…Extended role based access control model for IoT by incorporating the context information is presented in [8]. In [8], authors have considered IoT users rather than device. Furthermore, presented model have been demonstrated with the case studies than implementation.…”