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Photoplethysmogram (PPG) signals acquired by smartphone cameras are weaker than those acquired by dedicated pulse oximeters. Furthermore, the signals have lower sampling rates, have notches in the waveform and are more severely affected by baseline drift, leading to specific morphological characteristics. This paper introduces a new feature, the inverted triangular area, to address these specific...
To quantify the impacts of random inputs on hybrid electromagnetics (EM)-circuit systems or EM scattering from objects, an adaptive hierarchical sparse grid collocation (ASGC) algorithm combined with discontinuous Galerkin time-domain (DGTD) method is presented in this work. As a stochastic polynomial chaos modality, the ASGC method approximates the interested stochastic observables using interpolation...
Aiming at the international engineering contractors' legal risk problem, based on the analysis of a large number of cases and literature review, we count the factors effecting legal risk from the contractor's perspective. And then we transform the existing legal risk management process by using the method of IDEF0 system. From the process planning, process design, process evaluation, process implementation...
In this paper we try to combine HDR Mapping and Maxwell renderer, which is simulating real light physical characteristics, by collecting, processing and applying HDR Mapping. Specifically, we combine many methods to realize the layer rendering, including setting the parameter that is the simulation of real world, adding the HDR mapping rendering and simulating the effect of video lens. Therefore,...
The beam-switching characteristics of Magneto-Electric (ME) dipole antenna array is presented based on differentially exciting the two ports of the array with different polarities. The proposed principle is demonstrated using full-wave simulations that the depending on the polarity of the two excitations, either a magnetic-dipole or an electric-dipole radiation can be selectively achieved.
Uncertainties in realistic lumped and distributive circuit systems are of great importance to today's high yield manufacture demand. However, evaluating the stochastic effect in the time domain for the hybrid electromagnetics (EM)-circuit system was seldom done, especially when Monte Carlo is too expensive to be feasible. In this work, an adaptive hierarchical sparse grid collocation (ASGC) method...
The intentional and unintentional radiations are of great importance to electromagnetic coupling and radiation problems in both high and low frequency regimes. However, conventional computational methods emphasize the port-to-port performance instead of the detailed radiation mechanism that is critical to designs and optimizations. In this paper, we employ the PEEC method to quantitively analyze,...
Most current approaches in action recognition face difficulties that cannot handle recognition of multiple actions, fusion of multiple features, and recognition of action in frame by frame model, incremental learning of new action samples and application of position information of space-time interest points to improve performance simultaneously. In this paper, we propose a novel approach based on...
Periodic structures have attracted much attention in the past decades due to numerous applications such as metamaterials, antenna arrays, frequency selective surface (FSS), photonic band gap (PBG) or electromagnetic band gap (EBG) structures, etc. Infinite periodic structures are impossible in a realistic fabrication. When truncating infinite periodic structures, discontinuities occur at the interface...
In this work, the Fock currents on the convex cylinders are comprehensively studied. The contour deformation method is invoked to calculate the highly oscillatory Fock currents. The computational process is frequency independent in workload. Then, quadratic phase approximation is proposed to efficiently solve the highly oscillatory scattered field. Numerical results for the high frequency scattered...
A discontinuous Galerkin time-domain (DGTD) method is proposed for analyzing electromagnetic field interactions on graphene from microwave to terahertz frequencies. An impedance boundary condition (IBC) is utilized to model the graphene within the DGTD framework. The numerical flux is reformulated to take into account the IBC. Highly dispersive surface conductivity of graphene present in the resulting...
Metals are centrosymmetric materials which only posse local surface second-harmonic (SH) nonlinearities due to the symmetry broken at the surface. In this work the surface integral equation (SIE) is used for evaluating SH radiation generated from metal nanoparticles with arbitrary shapes. The whole SIE system is solved by employing the Galerkin testing procedure and Rao-Wilton-Gillson (RWG) basis...
A 2-D slot array structure to achieve near-field beam focusing, with a linear polarization, is proposed and demonstrated using full-wave simulations. The proposed structure has a negligible cross-polarization and its far-field gain is lower by 10 dB compared to the non-focus case, indicating a good focusing in the near-field of the structure.
Two widely used algorithms in computational electromagnetics (CEM) society, namely the asymptotic waveform evaluation (AWE) technique and the model order reduction (MOR) mode matching method, are employed to calculate electron wave propagation in novel nanoelectronic devices.
This paper presents an algorithm hybridizing discontinuous Galerkin time domain (DGTD) method and time domain boundary integral (BI) algorithm for 3-D open region electromagnetic scattering analysis. The computational domain of DGTD is rigorously truncated by analytically evaluating the incoming numerical flux from the outside of the truncation boundary through BI method based on the Huygens' principle...
A meandered version of the phase-reversal leaky-wave antenna is introduced to reduce the permittivity requirement εeff > 4 for single-beam full-space scanning.
The intentional and unintentional radiations are of great importance to wireless power transfer at the low frequency regime and antenna signal transportation at the higher frequency regime. Due to the rising speed of digital systems and thereby broad bandwidth of signal channels at all levels of electronic devices, it becomes more essential than ever to quantitively analyze, model, and illustrate...
Micrograsping devices and methodologies play an important role in the performance of high precision positioning systems as they contact the objects to be grasped directly. The polarization maintaining optical fiber's asymmetry structure generated a polarization axial, so rotational alignment is an extremely important issue to be concerned. To fulfill the demand of grasp and rotation in optical fiber's...
Based on the banded symmetric and Toeplitz matrix model for the mutual coupling of uniformly linear array (ULA), a reduced dimensional angle estimation and mutual coupling self-calibaration algorithm is proposed for bistatic MIMO radar. The new algorithm combines the angles with mutual coupling parameters but decouples them, which can provide accurate angle estimation without the knowledge of mutual...
Accurate segmentation of the prostate in computed tomography (CT) images is very important in image-guided radiotherapy. In the current study, an automatic framework is proposed for prostate segmentation in CT images: first, we propose a novel image feature extraction method, namely, variant scale patch, which can provide rich image information in a low dimensional feature space; second, we take the...
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