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The graphical password authentication scheme uses icons instead of text-based passwords to authenticate users. Icons might be somehow more familiar to human beings than text-based passwords, since it is hard to remember the latter with sufficient security strength. No matter what kind of password is used, there are always shoulder-surfing problems. An… (More)
This paper aims to investigate the light output power (LOP) of InGaN-based light-emitting diodes (LEDs) grown on patterned sapphire substrates (PSSs) with different symmetry. The GaN epitaxial layers grown on the hexagonal lattice arrangement PSS (HLAPSS) have a lower compressive strain than the ones grown on the square lattice arrangement PSS (SLAPSS). The… (More)
We experimentally report that the novel “chess board” like 1-D grating structure with optimal period of 800 nm can dramatically increases the J<sub>SC</sub> from 33.7 mA/cm<sup>2</sup> to 38.9 mA/cm<sup>2</sup> compared to the reference solar cell.
In this work, we propose two Fourier series expansion methods (FSEM), one improved from the original FSEM and another a simplified version of the improved FSEM, to significantly enhance the accuracy of solution along with consuming less computation time and to eliminate the Gibbs phenomenon when dealing with electrocardiography (ECG).
The protection of information is a very important issue in the digital world where the data can be easily copied, altered and transmitted. One of the well known ways to protect the multimedia is digital watermarking. For a common watermarking system, the test image is processed in digital form. Many researchers have devoted themselves to the studies of… (More)
By incorporating two-dimensional photonic crystals into the surface of InGaN-based LEDs, the strong correlation between the air duty cycle and the light extraction efficiency of LEDs was demonstrated by optical and electrical measurement results.