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A microwave gradient meta-surface is designed and fabricated. The structure is consist of a stack of two-dimensional (x-axis and y-axis) arrays of gradually-varied sub-wavelength elliptical rings, a dielectric substrate and a metallic ground plane. Both theoretical and experimental studies are conducted to demonstrate that the carefully designed y-axis phase gradient meta-surface supports high-efficiency...
Since China adopted the policy of fully opening retail market at the end of 2004, the entrance of multinational retail enterprises brought the reality and potential impact on the domestic retail such as structure, controlling power and competitiveness. From the perspective of industrial safety concept, combined with the mature DEA model, this paper focus on analyzing the security of the four kinds...
Feature selection is an important part of machine learning and data mining which may enhance the speed and the performance of learning and mining algorithms. Given certain criteria to evaluate features, the problem of feature selection can be regarded as an optimization problem. Therefore, evolutionary algorithms can be used to solve such a kind of optimization problems. In this paper, we present...
Baseline nonlocal means denoising scheme may be improved by incorporating more adaptivity, like locally varying filtering window, smoothing constants and patch size or shape. In this paper, we presents a novel adaptive nonlocal means filtering scheme, the key idea of which is that before computing the similarity between two pixels, active matching is performed to determine optimally matched patch...
Enterprise group will inevitably encounter organizational capacity absence and resources attenuation in its ongoing expansion process. But good governance model can guide enterprises development better. In this paper, we introduce the mainstream governance model of enterprise group, and then make use of fuzzy comprehensive mathematical methods to build a decision-making model for business choice....
We propose a novel superstrate for microstrip patch antennas, which is actually a metamaterial lens that could enhance the directivity of the antennas without changing their operation frequencies and the directions of maximum radiation. Such a superstrate could also be applied to other kinds of planar antennas, which is very important in the modern antenna designs.
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