Underwater acoustic channels are band-limited and reverberant, posing many obstacles to reliable, phase-coherent acoustic communications. While many high frequency communication experiments have been conducted in shallow water, few have carried out systematic studies on the channel properties at a time scale relevant for communications. To aid communication system design, this paper analyzes at...

In this paper we present a new model for the lifetime of wireless sensor networks used for sea water communications. The new model for power communications takes into consideration parameters such as power consumption for the active mode, power consumption for the sleep mode, power consumption for the transient mode, transmission period, transient mode duration, sleep mode duration, and active ...

SHORT COMMUNICATIONS

Technologies enable new modes of perception, which transform the imagination and inspire the arts. A vivid example of this process is the transvaluation of the underwater environment in the Western imaginary. For millennia, there were only very rudimentary technologies to observe this realm of our planet that is inhospitable to human physiology for longer than a breath of air.1 Humans understoo...

Microresonator optical frequency combs based on cascaded four-wave mixing are potentially attractive as a multi-wavelength source for on-chip optical communications. In this paper we compare time domain coherence, radio-frequency (RF) intensity noise, and individual line optical communications performance for combs generated from two different silicon nitride microresonators. The comb generated...

Data communications at sea nowadays depend on mainly satellite and radio media which are, however, not adequate to exchange massive information due to its own high cost and low bandwidth. Ships at sea in the near future would need broad and stable maritime data communication systems like on land. In this paper, we propose multi-carrier-based ad hoc network model and multi-carrier-based ad hoc r...

organizations are networks of unites and individuals enhancing organizational performance through cooperation and synergy. it is achieved by developing meaningful and purposeful communications of unites and individuals .thus, it is essential to make organizational communications efficient in order to achieve organizational purposes. in this essay, we examined the variables and factors affecting...

with the advent of digitalization, information and communications technology facilities have become an indispensable part of education especially at the universities. this study has been undertaken with dual purposes - to find the existing scenario of information and communications technology facilities and to gauge the perception of the students onthe quality of those facilities - at the unive...