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Mining topics in Twitter is increasingly attracting more attention. However, the shortness and informality of tweets leads to extreme sparse vector representation with a large vocabulary, which makes the conventional topic models (e.g., Latent Dirichlet Allocation) often fail to achieve high quality underlying topics. Luckily, tweets always show up with rich user-generated hash tags as keywords. In...
The traditional k-mean clustering method is sensitive to the initial clustering centers and easy to fall into local optimum solution. To overcome this problem a novel kernel clustering analysis method based on an almost parameter-free evolutionary algorithm, bare bones differential evolution (BBDE), is proposed in this paper. The constituent elements of the proposed method and its general steps to...
The Embarrassingly Parallel (EP) algorithm which is typical of many Monte Carlo applications provides an estimate of the upper achievable limits for double precision performance of parallel supercomputers. Recently, Intel released Many Integrated Core (MIC) architecture as a many-core co-processor. MIC often offers more than 50 cores each of which can run four hardware threads as well as 512-bit vector...
In this paper, we propose a novel blind digital image watermarking algorithm which is resilient to many kinds of image processing attacks and geometric distortions. To embed the watermark, we first map the original watermark to another spread one aiming to fit for the image size and then embed it into the image two-level DCT coefficients we selected using a specified rule. We extract the watermark...
In the redundant system, Common Cause Failure (CCF) can result in failures of more than one module. Human Error is one of the most important causes among all the causes of CCF. Human factor diversity is an effective method against CCF due to human error. Although there is clear evidence that diversity can bring benefits, these benefits can be difficult to quantify. The current methods of human reliability...
Nowadays, even though countries take measures to control the population, it is reported that the total number of global population has reached 7billion. In 21st century, the human society is still faced with the problems about the unprecedented consumption of material wealth and the unprecedented increase in population [1]. So the researchers should study the dynamic changes of resources and population...
At present, the voltage-fed Z-source inverter has widely been investigated, but the current-fed Z-source inverter has not been so well studied in control and modulation strategies. This paper presents a generalized method for establishing an equivalent relationship between modulation patterns being used for voltage-fed Z-source inverter and those possible for current-fed Z-source inverter. This means...
Test technique with multiple scan chains can fully reduce test time, but more data input channels, higher hardware overhead, lower test data compression ratio and lower fault coverage along with it are all paid more extensive attention to in the current test field. A cyclic shift compression technique is proposed and applied to multiple scan chain testing. Unlike general shift, cyclic shift technique...
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