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We proposed a gating exposure technique for femtosecond laser direct writing. The average laser power could be linearly controlled with the scanning speed while maintaining the exposure dose on the scanning path.
Crowd motion segmentation problem is a hot issue in crowd behavior analysis and action recognition. A number of methods have been proposed to tackle this problem. Among the existing methods, most used flow dynamics to model the crowd motion, with only a few taking the collective property into consideration. In this paper, we proposed a crowd motion segmentation approach based on streak flow and crowd...
In this work, we extend the idea of generalized Debye sources (GDS) method to electric field integral equation (EFIE) and establish a new well-conditioned GDS-EFIE. The principal challenge in implementing this approach arises from the difficulty in developing a robust solver for the surface Laplacian equation. In this paper, we propose using subdivision surfaces that permits such a solution due to...
Orbital angular momentum (OAM) is generated from a defect in two-dimensional (2-D) photonic crystals (PC). By breaking the translation symmetry along the two orthogonal directions, the localized defect states can be supported within photonic bandgap of the PC. Particularly, we examine the characteristics of the point defect states along the azimuthal direction by the finite-difference (FD) based eigenvalue...
The electrostatic tunability of graphene possesses interesting potential for microwave applications. We systematically investigate the electrical tuning response of the monolayer CVD grown graphene on a 500 um thick high-resistivity silicon (HRS). Coplanar transmission line embedded with 48 × 48 um2 graphene flakes is manufactured through standard microfabrication process and utilized to measure the...
This paper presents a high impedance surface (HIS) based leaky-wave antenna excited by collimated surface-wave (SW). The proposed antenna consists of a novel SW launcher (SWL) and a carefully designed HIS structure. The SWL employs a substrate-integrated waveguide (SIW) based 2-D offset-fed parabolic reflector and can efficiently generate collimated SW with TM0 mode. On the other hand, the HIS structure...
This paper proposes a novel method by rethinking the method of moments (MoM) solving process into a machine learning training process. Based on the artificial neural network (ANN), the conventional MoM matrix is treated as the training data set, based on which machine learning training process becomes conventional linear algebra MoM solving process. The trained result is the solution of MoM. The multiple...
Traditionally, Radiative Transfer (RT) formulation has been used to simulate scattering from snow layer with the incorporation of phase matrix of scatterers in the formulation. Typically, spherical scatterers were assumed to represent the ice particles embedded inside the air medium and Mie phase matrix was applied. However, the real scatterers in the actual snow are generally more irregular than...
In recent years, the human-computer interaction (HCI) systems (especially the exoskeletal rehabilitation systems) based on surface electromyography (sEMG) signals have been an important research direction. As previous researches indicated, some disabled individuals are unable to contract their muscles by themselves, but their sEMG signals do exist. If we can develop a follow-up control system based...
To date, surface electromyography (sEMG) signals have already been widely and effectively used for the detection and recognition of human limb movements, and applied as control signals in human-computer interaction (HCI) systems. Current trends indicate that taking natural human motion mode as input signals to control peripheral equipments, such as a robot or a mechanical arm, is one of the major...
In conjugation with the method of moments, the Bayesian compressive sensing algorithm is utilized to fast analyze the monostatic electromagnetic scattering problem. Different from the orthogonal matching pursuit based compressive sensing approach that cannot determine the required measurement times, the proposed method overcomes the difficulty by adopting the Bayesian framework to recover the underlying...
Besides amplitude, phase and polarization, wavefront is an important property of electromagnetic (EM) waves. EM waves with twisted wavefronts are known to carry orbital angular momentum (OAM). In this paper, a complementary-type metasurface is proposed to generate an OAM beam at microwave regime. Two metasurfaces that can produce OAM of order 2 and 4 are designed. By using our novel design methods,...
We investigate the influence of the finite width of the metamaterial slabs. The surface waves excited in finite-width slabs are numerically extracted by the rigorous coupled-wave analysis method. The magnitudes and decay rates of surface waves are analyzed for different materials and geometries. A general homogenization method based on the analysis of appropriately defined macroscopic fields in metamaterial...
A methodology to control the frequency transmission zeroes (FTZs) of a dual-mode resonator based elliptic-response filter is presented. Varactor loaded feeding structures are introduced for exciting a stub-perturbed ring-resonator to control the external quality factors associated with even and odd modes of the resonator. The technique allows for control of FTZs on either sides of the passband without...
This work presents a novel transient field-circuit simulation method based on the time-domain integral equation (TDIE) and circuit macromodels. The traditional field-circuit simulation method constructs the Kirchoff's equations for lumped circuits with SPICE models, but they cannot handle problems with unknown circuit structures. The proposed method creates parametric macromodels to represent the...
The paper presents a microstrip diplexer constructed by joining two stub-perturbed ring resonators at a T-junction. Each ring resonator acts as a bandpass filter with a transmission zero lying very close to the passband of the other filter, thereby increasing the isolation between the two channels. A short stub is additionally added at the T-junction to improve the matching at the common port. The...
The particle size analysis of rock particle image has a wide application in practice. However, there is a challenge to extract complex particle size information because of the mutual adhesion among the particles. Fuzzy c-means clustering(FCM) algorithm can segment image by multiple eigenvalues of image, but it's difficult to determine C the number of sample set of clustering and m the fuzzy weighting...
Rank-reduction (RARE) methods for decoupled 2D direction-of-arrival (DOA) estimation are exposed to performance breakdown with a small number of elements in uniform circular arrays (UCAs) due to the residual component in the beamspace data. To overcome this shortcoming, a modified RARE algorithm for DOA estimation with UCAs is proposed in this paper. Based on the UCA-RARE for azimuth estimation and...
Binary data in 1T1C or 2T2C non-volatile ferroelectric random access memories, which are represented by the polarization charges of switching and non-switching events, are retrieved when a reading current pulse exceeds the sense amplifier threshold for discrimination of nonswitching pulses, and a reset pulse is required after the destructive readout. Downscaling the dimensions of such memory cells...
Low-rate Denial of Service (LDoS) attack is one of great threats to computing platform and big data center. LDoS attacks are difficult to be found because its average attack rate is low enough to evade traditional DoS-based countermeasures. In this paper, the propagation back (BP) model of neural network is used to establish the nonlinear model of network traffic, and a method of LDoS attacks detection...
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