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37th Annual International Conference of the IEEE-Engineering-in-Medicine-and-Biology-Society (EMBC)

作者： Shariat, M. H. Gazor, S. Redfearn, D. Queens Univ Arrhythmia Res Ctr Kingston ON Canada Queens Univ Dept Elect & Comp Engn Kingston ON Canada

ISBN: (纸本)9781424492701

Atrial fibrillation (AF), the most common sustained cardiac arrhythmia, is an extremely costly public health problem. Catheter-based ablation is a common minimally invasive procedure to treat AF. Contemporary mapping methods are highly dependent on the accuracy of anatomic localization of rotor sources within the atria. In this paper, using simulated atrial intracardiac electrograms (IEGMs) during AF, we propose a computationally efficient method for localizing the tip of the electrical rotor with an Archimedean/arithmetic spiral wavefront. The proposed method deploys the locations of electrodes of a catheter and their IEGMs activation times to estimate the unknown parameters of the spiral wavefront including its tip location. The proposed method is able to localize the spiral as soon as the wave hits three electrodes of the catheter. Our simulation results show that the method can efficiently localize the spiral wavefront that rotates either clockwise or counterclockwise.

关键词： electrocardiography medical disorders medical signal processing Archimedean spiral wavefront IEGM activation time arithmetic spiral wavefront atrial fibrillation atrial intracardiac electrograms catheter based ablation catheter electrode location computationally efficient method contemporary mapping methods minimally invasive procedure rotor source anatomic localization spiral rotor source localisation spiral wavefront rotation sustained cardiac arrhythmia synthetic intracardiac electrograms Cardiology Catheters Electrodes Europe Guidelines Rotors Spirals

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A method for Evaluating the Worst-Case Cogging Torque Under Manufacturing Uncertainties

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IEEE TRANSACTIONS ON ENERGY CONVERSION 2020年第4期35卷 1837-1848页

作者： Yang, Yongxi Bianchi, Nicola Zhang, Chengning Zhu, Xiaofeng Liu, Haipeng Zhang, Shuo Beijing Inst Technol Sch Mech & Vehicle Engn Beijing 100811 Peoples R China Univ Padua Dept Ind Engn I-35122 Padua Italy Southeast Univ Nanjing 210096 Peoples R China

Permanent-magnet (PM) motors have been widely used in industrial applications and automobiles. However, owing to the design tolerances, manufacturing uncertainties, and material inconsistency, deviations from the ideal motor inevitably occur with parasitic effects, such as additional cogging torque and vibration. One of the most significant obstacles for evaluating these uncertainties is the large computational burden caused by the countless uncertain combinations, which must be computed via the finite-element method (FEM). Herein, a worst-uncertain-combination-analyze (WUCA) method is proposed to significantly reduce the computational cost. A widely used analytical method is modified to identify the origin of additional cogging-torque harmonics caused by uncertainties. Different types of uncertainties for the surface-mounted PM machine and interior PM machine can be analyzed simultaneously. With the WUCA method, the worst-case combinations can be confirmed theoretically;thus, FEM calculations for only a few combinations of uncertainties are required, rather than thousands. Compared with the widely adopted design of experiments based uncertain combining methods, the worst-case cogging torque obtained from the WUCA is higher. FEM verification of different pole/slot configurations revealed that the WUCA method was a general and effective method for quickly estimating the worst-case cogging torque under manufacturing uncertainties.

关键词： Uncertainty Torque Forging Stators Robustness Finite element analysis Manufacturing uncertainties worst-case cogging torque computationally efficient method analytical method robust evaluation

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Calculation and error bound of Min-approximated bitwise log-likelihood ratios of generalised M-ary PAM

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JOURNAL OF ENGINEERING-JOE 2020年第3期2020卷 104-106页

作者： Park, Sung-Joon Lee, Daniel C. Gangneung Wonju Natl Univ Dept Elect Engn Kangnung South Korea Simon Fraser Univ Sch Engn Sci Burnaby BC Canada

In modern digital communication systems, a high-order modulation and advanced channel coding are often jointly used to increase the spectral efficiency and coding gain. In this work, the authors investigate a computationally efficient method for evaluating the bitwise log-likelihood ratios of generalised M-ary pulse amplitude modulation (PAM) signals with the Min approximation. The proposed scheme is simple and can be applied to demodulate the M-ary PAM having an arbitrary symbol spacing and a bit stream mapping. The computational complexity and upper bounds of the approximation error are also provided for a better understanding of the proposed scheme.

关键词： computational complexity channel coding digital communication pulse amplitude modulation channel coding spectral efficiency coding gain computationally efficient method ary PAM signals Min approximation computational complexity upper bounds approximation error Min-approximated bitwise log-likelihood ratios modern digital communication systems high-order modulation

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An efficient method for computing atmospheric radiances in clear-sky and cloudy conditions

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JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER 2011年第1期112卷 109-118页

作者： Chen, Xiuhong Wei, Heli Yang, Ping Jin, Zhonghai Baum, Bryan A. Chinese Acad Sci Key Lab Atmospher Composit & Opt Radiat Anhui Inst Opt & Fine Mech Hefei 230031 Anhui Peoples R China Texas A&M Univ Dept Atmospher Sci College Stn TX 77843 USA Analyt Serv & Mat Inc Hampton VA 23666 USA Univ Wisconsin Ctr Space Sci & Engn Madison WI 53706 USA

A computationally efficient method is developed to simulate the radiances in a scattering and absorbing atmosphere along an arbitrary path in the spectral region ranging from visible to far-infrared with a spectral resolution of 1 cm(-1), For a given spectral region, the method is based on fitting radiances pre-calculated from the discrete ordinate radiative transfer (DISORT) at several wavenumbers. Radiances at other wavenumbers are interpolated based on the pre-computed total absorption and scattering optical thicknesses and the surface albedo. The computational efficiency and accuracy of the method are tested in comparison with rigorous simulations for various scenarios under the same conditions. For both clear-sky and cloud atmospheres, the present method is at least 140 times faster than the direct application of DISORT. Across the spectral range, the standard relative differences between the new method and the DISORT are less than 2% for clear-sky conditions. Root-mean-square (RMS) differences of the top of the atmosphere (TOA) brightness temperatures between the new method and DISORT, for atmospheric infrared sounder (AIRS) channels over clear-sky, ice cloudy and water cloudy skies, are within the noise equivalent differential temperature (NEDT) of the AIRS sensor. The fast method is also applied to simulations of the spectral downwelling radiance measured by the Fourier transform infrared (FTIR) interferometer, and to the simulations of the AIRS upwelling radiances under clear-sky and cloudy conditions. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： computationally efficient method Spectral radiances Multiple scattering

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Summation methods of Coulomb interactions in computer simulations of a system with one-dimensional periodic boundary conditions

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MOLECULAR PHYSICS 2003年第21期101卷 3177-3184页

作者： Bródka, A Silesian Univ Inst Phys PL-40007 Katowice Poland

The Ewald-type method, its modified version and the Lekner-type method for summing Coulomb interactions in a system periodic along one direction are presented and compared. Advantages and disadvantages of these methods are discussed, and the methods are tested in molecular dynamics simulations of acetone molecules confined to cylindrical silica pores.

关键词： computationally efficient method Molecular-dynamics simulation Point-dipolelattices Ewald-type summation Electrostatic interactions 3-dimensional system Liquid acetone 2directions Quasi-2-dimensional simulations 2-dimensional periodicity

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Subspace training method for multiuser detection in dispersive CDMA channel

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ELECTRONICS LETTERS 2000年第15期36卷 1315-1317页

作者： Zhang, YR Bi, GA Ng, BP Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore

A subspace training method is presented for multiuser detection in dispersive DS-CDMA channels with the presence of multiple access interference (MAI). By using a small number of training symbols of the desired user, ... 详细信息

关键词： multiuser detection dispersive CDMA channel subspace training method multiple access interference code division multiple access dispersive channels near-far resistant method training symbols DS-CDMA channels signal detection MAI computationally efficient method radiofrequency interference

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Novel method for super-resolution in radar range domain

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IEE PROCEEDINGS-RADAR SONAR AND NAVIGATION 1999年第1期146卷 40-44页

作者： Liu, S Xiang, J Univ Elect Sci & Technol China Inst Elect Engn Chengdu 610054 Peoples R China

A method based on adaptive regularisation for range super-resolution is presented. The method is computationally efficient and has low SNR threshold close to that of the maximum likelihood (ML) method. The method can simultaneously estimate the number and time delays of the overlapping echoes, whereas determining the number of echoes in ML-type algorithms is difficult. Numerical simulation results demonstrate the performance and show that the method is capable of simply and effectively achieving enhanced range resolution.

关键词： computationally efficient method adaptive regularisation adaptive signal processing radar resolution overlapping echoes Radar theory maximum likelihood estimation numerical analysis Signal processing and detection numerical simulation results maximum likelihood method ML-type algorithms radar range domain MLE super-resolution low SNR threshold performance Other topics in statistics delay estimation time delay estimation

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Transient simulation of lossy coupled transmission lines using iterative linear least square fitting and piecewise recursive convolution

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS 1996年第11期43卷 923-932页

作者： Chang, EC Kang, SM UNIV ILLINOIS DEPT ELECT & COMP ENGN URBANA IL 61801 USA UNIV ILLINOIS COORDINATED SCI LAB URBANA IL 61801 USA

We present a computationally efficient method to stimulate lossy transmission lines using iterative linear least square fitting (ILLSF) model synthesis and piecewise recursive convolution (PRC). Based on the generalized method of characteristics, transmission lines are modeled with characteristic impedances and waveform generators. Thus the first major task involves network synthesis. The second is efficient computation of the synthesized waveform generators which requires computationally expensive convolution integral evaluation during transient simulation of transmission lines. The superior performance of ILLSF and the efficiency of PRC will be demonstrated for the transient simulation of coupled lossy transmission lines.

关键词： circuit analysis computing convolution integrated circuit interconnections iterative methods least squares approximations transient analysis ILLSF model synthesis characteristic impedances computationally efficient method iterative linear least square fi Convolution lossy transmission line coupled transmission lines Transient analysis Characteristic impedance circuit analysis computing Least squares method waveform generators iterative methods integrated circuit interconnections Transmission Lines least squares approximations PERIODIC REVERSAL

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APPLICATION OF THE GENERALIZED BICONJUGATE GRADIENT FFT method FOR ANALYZING PLANAR FREQUENCY SELECTIVE SURFACES

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ELECTRONICS LETTERS 1988年第9期24卷 565-566页

作者： PETRE, P ZOMBORY, L TECH UNIV BUDAPEST DEPT ELECTROMAGNET THEORYH-1521 BUDAPESTHUNGARY

A computationally efficient method is presented for analysing the scattering from frequency selective surfaces (FSS) composed of arbitrarily shaped patches with finite conductivity. In this technique the generalised biconjugate gradient (BiCG) method and fast Fourier transform (FFT) are used to solve for the induced current densities. It is shown that this method requires fewer iterations than the conjugate gradient (CG) or the preconditioned CG method

关键词： arbitrarily shaped patches computationally efficient method electromagnetic wave scattering fast Fourier transforms finite conductivity generalized biconjugate gradient FFT method induced current densities iterations planar frequency selective surfaces

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