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Nonintrusive efficiency evaluation method based on the air gap torque and rotor slot frequency is generally used in industry application. However, this method has the following problems: 1) the number of rotor slots should be given in advance; 2) with some special number of pole pairs and rotor slots, the stator and rotor slot harmonics may be aliasing, which may lead to great errors in identification...
A surface lumped circuit model is formulated for the discontinuous Galerkin time-domain modeling of devices with lumped elements. A leap-frog algorithm is used for time integration, resulting in an explicit and conditionally stable time-marching algorithm. A microstrip filter with four ports and two lumped elements is simulated to validate the proposed method.
An accurate and fast algorithm is proposed to evaluate the specific absorption rate (SAR) in an anatomically realistic human head model exposed to a wideband antenna. The algorithm is based on the discontinuous Galerkin time domain (DGTD) method using hybrid meshes. Hexahedral and tetrahedral meshes are used, respectively, to model the human head with a voxel data format and the wideband antenna with...
Aiming at the real-time monitoring of Sewage in the service area. This paper presents a sewage quality monitoring system based on ZigBee wireless sensor network. Wireless sensor networks adopt star structure, the system consists of data acquisition terminal node, the coordinator node and the monitoring center. The terminal node sends the collected data to the coordinator node, Coordinator node sends...
The wireless monitoring and management system of tower crane based on Modbus / TCP protocol is designed for the distributed, efficient and safe operation of tower crane. Designing monitor surveillance terminal with Cortex A8 and WinCE6 as platform for real-time monitoring of state information of tower crane operation. And then, Using Modbus / TCP protocol to design a wireless communication message,...
Discontinuous Galerkin time domain (DGTD) offers attractive properties when it is applied to solve Maxwell's equations. The DGTD method is originated from the finite volume time domain (FVTD) and finite element method (FEM), and has the advantages of the two methods; furthermore, it is more flexible and accurate, and provides an embarrassingly parallel characteristic than FVTD and FEM. In this chapter,...
In this paper, we present a hardware acceleration technique using the SSE (streaming SIMD (single instruction multiple data) extensions) instruction set to improve discontinuous Garlekin method Time Domain (DGTD) for solving Maxwell's equations. The improvement performance of the DGTD methods is investigated via some typical examples. The numerical results of the SSE accelerated DGTD method on the...
An efficient algorithm based on the discontinuous Galerkin time-domain (DGTD) method with a hybrid mesh is proposed to simulate electromagnetic problems. To validate the algorithm and demonstrate its efficiency, a spherical cavity and a horn antenna are simulated using hybrid meshes.
The safety is an important issue in robot-assisted rehabilitation systems. In this paper, we present a therapist-joined hybrid control method to improve the safety of a robotic ankle-foot system for post stroke rehabilitation, combining therapist-joined zero torque control and proxy-based sliding mode control in the continuous passive motion based rehabilitation. The zero torque control is applied...
Noise artifacts in magnetic resonance (MR) images increase the complexity of image processing workflows and decrease the reliability of inferences drawn from the images. To reduce noise, the non-local means (NLM) filter has been shown to yield state-of-the-art denoising performance. However, NLM relies heavily on the existence of recurring structural patterns and this condition might not always be...
Automatic Dependent Surveillance-Broadcast (ADS-B) is vulnerable to spoofing interference which will lead to the failure of Air Traffic Management (ATM) systems. This paper proposed an effective approach to detect and suppress the spoofing interference based on a cross-antenna array without estimating the direction of arrival (DOA) of the received signal. Firstly, the location of target is received...
The weakness of ADS-B signals makes it vulnerable to jamming. In order to suppress jamming, the paper proposes an ADS-B anti-jamming approach with low-complexity based on a cross-antenna array. First, down-sampling the digital IF signals received by array, and estimating the covariance matrix using the down-sampled snapshots. Because of the different duration and different features of DOAs between...
➢ Automatic Dependent Surveillance-Broadcast (ADS-B) is an Air Traffic Management (ATM) Surveillance system that is intended to replace traditional radar based system.
In this paper a chaos-based digital image encryption scheme by a permutation-substitution structure is proposed. Its design and implement have been detailed discussed and tested. The results of simulation and analysis show that the proposed image encryption scheme provides a secure way for image encryption.
This paper presents a sub-channel allocation algorithm for OFDMA-based multi-cell networks where co-channel interference from nearby cells is serious in the downlink transmission. The algorithm is semi-distributed in the sense that the sub-channel allocation can be split between radio network controller (RNC) and base stations (BSs). RNC will decide the sub-channels used by each BS at the super-frame...
The ever-growing complexity of automotive software is becoming the bottleneck of cars' innovation. AUTOSAR, as a worldwide accepted solution, provides a novel methodology to support component-based application design and distributed computation. Acting as the infrastructure to put this into action, Run-Time Environment (RTE) is required to deal with various scheduling and communication demands. One...
This paper proposes a preset threshold based cross-tier handover algorithm for uplink co-channel interference mitigation in two-tier Femtocell netowrks. The proposed cross-tier handover algorithm introduces a preset threshold cross-tier handover policy, which takes into account both the Time-to-Stay (TTS) in the Macrocell/Femtocells and the received Signal to Interference plus Noise Ratio (SINR) at...
This paper studies the handover decision problem in multi-cell networks and proposes a handover decision algorithm, which jointly uses location information and the network load to decrease handover numbers and maintain user's quality of service (QoS). With the help of GPS, it is feasible to obtain location records of each user in recent times. The user's next movement direction angle can be calculated...
In this paper, we propose a dynamic bandwidth allocation algorithm based on the transmission rate adaptation to guarantee the quality of service (QoS) for multi-services in heterogeneous wireless networks. Based on the proposed transmission rate-based priority decision model, an optimal bandwidth reallocation matrix can be obtained by adaptively adjusting users' transmission rates according to the...
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