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Energy-efficient design has emerged as a promising technique in heterogeneous networks. We study the energy efficiency problem of joint user association and power allocation in a two-tier heterogeneous network with small cells. The energy efficiency is maximized under certain prescribed quality-of-service requirement and maximum power limit constraint. The original optimization problem is a nonconvex...
Proton Exchange Membrane Fuel Cells (PEMFCs) are promising energy devices that can be used as the power sources in many applications. But short life duration of the PEMFCs still limits their large scale commercialization. The prognostics and health management (PHM) is a series of methods that not only monitor the state of health (SOH), but also take proper actions to extend the remaining useful life...
With emerging synchronized phasor measurement technology, estimating dynamic state in real time (post fault) for the grid operation become feasible. However, PMU measurements undergo random errors and bad data unavoidably caused by the sensor errors, disturbances, etc. The traditional centralized state estimation methods for power system static state are not applicable for the electro-mechanical transient...
In this paper, linear elevator driven by permanent magnet synchronous linear motor (PMLSM) is used in fuzzy PID control method, in which it is to adopt the magnetic guidance system to control the PMLSM gap which changed frequently, and it can impact the vertical thrust and control the level vibration and noise in the process of start, operation, and stop to make passenger comfortable. Matlab modeling...
Nowadays, many researches have been carried out to simulate people's movement behaviors under emergencies. This paper proposes a feasible way for pedestrian evacuation guidance service and developed an evacuation simulation and guidance system. The system takes a real building as its base-map; CA model is used to simulate the pedestrians' movements; different fire models are developed in consider...
Secure and efficient trust model is one of vital means for guaranteeing data authenticity in P2P network. An anonymous trustful-agents-based trust model is proposed in this paper, which comes from construction approach of trust relations in the social network. This model uses several public/private key pairs and onion routing, as a result, which is capable of commendably guaranteeing peer anonymity...
In this paper, the design and implementation of a high performance soft LDPC-CC decoder IP generator is presented. The proposed design is based on quasi-cyclic (QC) low-density parity-check matrices. These matrices not only simplify decoder design but also require less memory storage. A special digital processor is proposed to reduce the critical path and enhance the throughput. In addition, we have...
Harmonic pollution and reactive power compensation are the important power quality problems. This paper proposes a combined power filter system consisting of the parallel operation of a hybrid active power filter (HAPF) and the passive power filters or capacitors. The HAPF is formed by a single tuned LC filter per phase and a small-rated three-phase active filter, which are directly connected in series...
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