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In the integral equation method for solving electromagnetic problems with thin conducting structures, there are several unfavorable factors. The individual electric field integral equation (EFIE) and magnetic field integral equation (MFIE) may deteriorate the conditioning of matrix equations due to their degeneration when the thickness reduces. Also, there are more near-interaction evaluations in...
Reconstructing unknown dielectric objects by integral equation approach requires an efficient solution of volume integral equations (VIEs) and the widely-used method of moments (MoM) with the Schaubert-Wilton-Glisson (SWG) basis function may not be appropriate in such a scenario due to the unknown profile of objects in the imaging domain. In this work, we develop a meshless scheme for solving the...
Ray tracing within a uniform grid volume is a fundamental process invoked frequently by many radiation dose calculation methods in radiotherapy. Recent advances of the graphics processing units (GPU) help real-time dose calculation become a reachable goal. However, the performance of the known GPU methods for volume ray tracing is all bounded by the memory-throughput, which leads to inefficient usage...
Incorporating biomedical information into nonrigid image registration is an important approach to improve the registration quality and provide realistic results. However, previous tissue-dependent deformation field filtering incur a relatively high computation cost in order to obtain results of improved quality. In this paper, we propose a collapsed-cone based adaptive filtering method to reduce the...
In this paper, we propose effective modeling and novel spectral-based propagation schemes to address the general problems of time-dependent quantum simulations. The integral solution of the time-ordered evolution operator is obtained accurately via direct Hamiltonian diagonalizations performed using the new eigenvalue solver FEAST. In addition, we have designed a new highly efficient basis transformed...
A multiscale model of blood clot (thrombus) formation is extended by adding a sub-model of the tissue factor (TF) pathway of blood coagulation to provide more biologically relevant description of coagulation process. A combination of experimental approach, image analysis and a multiscale modeling is used for studying role of factor VII and fibrin in limiting growth of a blood clot. The simulations...
A compact trench-gate IGBT model that captures MOS-side carrier injection is developed. The model retains the simplicity of a one-dimensional solution to the ambipolar diffusion equation, but at the same time captures MOS-side carrier injection and its effects on steady-state carrier distribution in the drift region and on switching waveforms.
This paper focuses on the development of maximum wind power extraction strategies for variable speed constant frequency (VSCF) grid-connected wind power generation systems with a doubly fed induction generator (DFIG). A new optimal control method is proposed by controlling the generator stator active and reactive power, which is based on the condition of the system operation for not only the extracted...
With the development of power electronic techniques, more and more attention has been paid to DC power systems. This paper analyzes the load flow issues containing DC/DC converters in a DC power system. The load flow model of DC/DC converters, which considers the power losses and control strategy of the converter, has been presented and integrated into the traditional load flow algorithm by modifying...
Summary form only given. We demonstrate, for the first time to our knowledge, stable partially incoherent anti-dark solitons in non-instantaneous nonlinear media. Experimental results and computer simulations indicate that the instability affecting an anti-dark soliton can be totally eliminated by properly engineering the incoherence of its background beam with respect to the threshold required for...
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