In ad hoc networks, relay nodes use their limited resources such as battery capacity, CPU, buffer, etc. to support other nodes' communications. This discourages users from joining an ad hoc network and becoming a relay node. Receiving a reward for supporting relay may encourage users to join such networks. This research focuses on the factors of residual battery power, and time during which AC ...

All the internet services available these days are dependant and running in data centers. Companies like Google, Facebook, and Microsoft hosts millions of servers in their data centers to provide services to their users [19]. The enormous size of data centers leads to huge energy consumption. According to a news article, Google drew 260 MW of power in 2011 [6] that cost millions of dollars. Rec...

This paper introduces a communication system model with renewable power supply. As we assumed a battery-free microgrid system with conventional power as a backup power supply, we propose a method of power state and data transmission scheduling for delay-tolerant communication networks, which reduces conventional power consumption by operating adaptively to changes in renewable power. We found t...

A mathematical model of an output multiple-filter for three-phase voltage source uninterruptible power supply (UPS) inverter with state-space technique is described in this paper. Performance of the proposed filter is then predicted and result is compared with that of the LC output filter. Simulation results show the harmonic reduction in the output voltage waveform of the UPS due to the applic...

The transportation industry consumes about 28% of the total energy consumed by all sectors in the United States. This paper proposes a renewable wind power system (RWPS) as an alternative power source for signalized traffic intersections. The proposed system can be mounted onto the existing transportation infrastructure to provide reliable green electricity. Large-scale implementation of such a...

A novel scheme of the well-known technique for parallel operation of uninterruptible power supply systems, namely frequency and voltage droop control method, is presented. The innovation relies on active power estimation, together with the use of a piecewise-continuous nonlinear function, in order to eliminate the need for costly cascaded low-pass filters usually employed to estimate the reacti...

In this paper, a simpler implementation of the well-known droop method for the control of parallel Uninterruptible Power Supply (UPS) systems is presented. In this method, in the power-sharing control scheme, the output current is calculated by software without the need for a current sensor, resulting in a simpler and cheaper structure. By doing so, the number of feedback sensors is reduced fro...