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The present investigation focuses on the flexural behavior of HS steel-concrete composite beams using the commercial finite element (FE) software LS-DYNA. Herein, HS steel-concrete composite beams were constructed with a welded high strength steel I section beam and high strength concrete slab. The proposed three-dimensional FE model is able to simulate the overall flexural behavior, including load...
There are various modulation schemes suitable for optical wireless communications. Among these schemes, the multiple pulse position modulation scheme (MPPM) was proved to be more power efficient than other modulation schemes such as: on off keying (OOK), pulse amplitude modulation (PAM) and pulse position modulation (PPM)[1]. While taking bandwidth efficiency into account, MPPM is not a strong candidate...
This paper presents a method for reducing surface wave coupling between aperture coupled microstrip antennas by the use of mushroom-like electromagnetic band-gap (EBG) structures. Dispersion diagram of the EBG structures was studied by the FDTD method before the EBG structures were combined with the antennas to reduce the mutual coupling. Convolution perfect matched layer (CPML) and periodic boundary...
The rate control model used in the HEVC reference software HM10.0 is a R-λ model. In this model the distortion is measured by Mean Squared Error (MSE) and Sum of Absolute Difference(SAD). However, MSE and SAD are not correlated well with perceptual image quality. In this paper, we propose an improved LCU-level rate control algorithm based on the structural similarity (SSIM) index which was proved...
In this paper, we propose a novel motion compensated prediction (MCP) framework which combines the properties of motion vector restriction and weighted advanced motion vector prediction (AMVP) to achieve higher prediction accuracy for High Efficiency Video Coding (HEVC). In our framework, motion vectors of the prediction units (PUs) surrounding the current PU are checked first by a motion field model,...
An effective optimization scheme based on improved implicit space mapping (ISM) algorithm is presented in this paper for the first time to design microstrip dual-band bandpass filters with high performance. The 2.45GHz/5.7GHz and 3.5 GHz/5.25GHz dual-band filters using folded open-loop ring resonators (OLRRs) are implemented with satisfying passband and stopband response. The overall size of the previous...
Combining conventional radar absorbing material with periodic patch array structures, say frequency selective surface (FSS) type absorbers, have more freedom of degrees and so can be designed to be more efficient than the conventional radar absorbing material. In this paper, three optimization schemes such as parallel particle swarm optimization (PPSO), binary-coded genetic algorithm (BGA) and decimal-coded...
A modified Sierpinski fractal broadband antenna for multiband application is investigated, simulated, and measured in this paper. The perturbed fractal patch and the modified groundplane are employed to obtain the wider bandwidth at the resonance frequencies. The implemented antenna, with nearly omnidirectional radiation pattern, has been designed with a total dimension of 50.8??69??1.6 mm3. According...
Both the effective permittivity and the effective permeability of a left-hand medium (LHM) with four cells of surface split square ring resonator (SSSRR), an improved LHM unit cell, is calculated by using transmission/reflection method. Then metamaterial superstrates with different arrange of the SSSRR cells are devised, and their effect on the radiation characteristics of traditional rectangle microstrip...
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