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In this paper, an improved cooperative jamming (CJ) strategy is developed for physical layer (PHY) security in a multi-hop wireless communication system which employs beamforming in the last hop. Users are assigned to independent groups based on the merger-and-split rule in a coalition game. The secrecy capacity for a valid coalition is a non-convex optimization problem which cannot easily be solved...
This paper investigates the effects of underfill epoxy resin and silicone gel elastomer on packaging induced thermal mechanical stresses for a simplified double-sided cooling power package using finite element method. Visco-elastic and hyper-elastic constitutive models were used to simulate the non-linear material properties. The results were compared to the models with linear elastic material.
Super-hydrophobic silicone rubber (SIR) was fabricated by hot-pressing template method, and its surface water droplet contact angle reached 153.5?? and sliding angle 8??. The observation of microstructure showed that there were plenty micrometer-scale papillas and nanometer-scale particles on its surface, the mechanism of superhydrophobicity caused by this micro-nano hierarchical structure was discussed...
Degeneration of inverse synthetic aperture radar (ISAR) image quality may be caused by rotational motion induced quadratic phase error (QPE). Traditional algorithms can't correct the QPE well with smaller number of pulses. In this paper, the Parametric Compressed Sensing Least Square (PCS-LS) is proposed to compensate the QPE on each range bin and to reconstruct the image robustly. Mig-25 data is...
In this article, we present a novel gang control system in drive application for a six-phase induction motor, forcing on the properties of gang Variable Voltage Variable Frequency(VVVF) control system, which is based on integration of power drive modules and power electronic system. The design of VVVF system for six-phase induction motor is set up, the results of theoretical analysis and MATLAB simulation...
In this paper, a control technique is proposed for parallel connected inverters to share linear and nonlinear loads in proportional to their capacities. Using locally measurable feedback voltages and currents without an external communication mechanism, this technique considerably reduces the sharing error of reactive power, output voltage drop and output voltage distortion, which are inherent drawbacks...
We propose a decentralized Peer-to-Peer (P2P) Video-on-Demand (VoD) system. The traditional data center architecture is eliminated and is replaced by a large set of distributed, dynamic and individually unreliable helpers. The system leverages the strength of numbers to effect reliable cooperative content distribution, removing the drawbacks of conventional data center architectures including complexity...
A precise bandgap reference with intrinsic compensation for current-mirror mismatch is presented. In the proposed circuit, the small-signal current variations in the two current paths are self-compensated while in the conventional bandgap core they are multiplied. As a result, error caused by current-mirror mismatch has been much reduced in the proposed circuit. Precise and simple models are developed...
In this paper, a control technique is developed for parallel inverters with no control interconnections in microgrid. The proposed control technique, based on droop control method and virtual impedance method, uses only locally measurable feedback signals to make some of the parallel inverters supply only reactive power equally for loads while the others share only active power. Simulation results...
The main steam pressure control system in power plant is adjusted by the variation of the fuel quantity and give-wind. It is a large inertia, long time-delay system relative to the variation of fuel. Conventional PID cascade control system canpsilat obtain satisfied control performance due to the time-delay characteristic of main steam pressure system which is incarnated mainly on the steam-water...
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