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The goal of Frequent Item set Mining (FIM) is to find the biggest number of frequently used subsets from a big transaction database. In previous studies, using the advantage of multicore computing, the execution time of an Apriori algorithm was sharply decreased: when the size of a data set was more than TBs and a single host had been unable to afford a large number of operations by using a number...
An object detection method which can be used in indoor and outdoor monitoring was proposed in this paper. Improving shortcomings and disadvantages of moving object extraction in traditional inter-frame difference method, it puts forward a moving object recognition algorithm based on redundant wavelet transform, namely, extraction of feature points in redundant wavelet domain to generate a delaunay...
By using intensity probability density and color invariance model, a novel feature-based color image watermarking method is proposed in this paper. Firstly, the uniform and robust feature points are extracted in the color invariance model by utilizing modified speeded up robust features (SURF) detector, in which the intensity probability density gradient is used instead of intensity gradient. Then,...
We report the increasing in average external quantum-efficiency (EQE) of 11% on the top-cell of GaAs-based triple-junction solar-cell due to current matching using a graded-index SiO2-nano-pillars sub-wavelength/SiO2/TiO2 AR-coating by CF4-RIE etching with Ag-nanoparticles mask.
Interconnecting the distributed energy resources with the grid, which forms a distributed energy systems, is a promising way to enable renewable energy integration and to solve global problems such as energy crisis and climate change. Voltage regulation is a necessary requirement in the distributed energy systems, particularly in the systems operating in the island mode and serving the voltage-sensitive...
Wireless Sensor Networks have been proposed for a multitude of location-dependent application. Solutions in range-free localization are being pursued as a cost-effective alternative to more expensive range-based approaches. In this paper, we present an improved midnormal-based localization algorithm. Compared with its former scheme MBLA, our scheme performs with less compute overhead and improve the...
A hybrid system is a complex system which consists of continuous and discrete dynamics, and it displays discrete behaviors, in addition to continuous behaviors. Due to mode changes in a hybrid system, the employment of constant threshold will cause false alarm or missed detection. The cause is that mode changes lead to different composition of component uncertainties. In this paper, in view of component...
The difficulty for accurate determination of the angles of arrival (AOA) of signals arises from the optimization of likelihood functions of high dimension. Usually, a gradient-based technique is employed to find the optimum of the function. However, this method requires heavy computational work and the differentiability of the likelihood function. This paper presents two gradient-free methods: One...
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