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Topic models such as LDA have been widely used to capture latent topics in textual collections. Due to the large scale of data, researchers begin to pay more attention to speed up the efficiency of LDA Gibbs sampling by parallel inference algorithms or distributed computing. In this paper, we improve the traditional Approximate Distributed LDA (AD-LDA) algorithm by introducing weighted factor during...
Internet addiction is a serious social problem nowadays. People with internet addiction usually spend much time on line, which there is no effectively technical way to evaluate. We propose a time-online evaluating method based on net log. The method gathers adjacent timestamps of every account's network log into a cluster, which can be seen as a time period. The sum of all periods is the account's...
3D reconstruction from the microscopy images of serial sections plays an important role in analyzing structure of biological specimens, such as neuronal circuits in brain tissue. This paper is focusing on the 3D reconstruction of synapses which is a branch of micro reconstruction of brain. Having analysed the structure of synapses, we first detect and locate them in serial sections with cascade AdaBoost...
We report a compact all-solid-state mid-infrared optical parametric oscillator with wide tenability using periodically poled 5 mol % MgO-doped LiNbO3 with a multiple-channel structure design and pumped by a compact diode-pump solid-state laser operating at 1.064 µm. Wide tunability from 1.44 to 1.58 µm at the signal beam wavelength and from 3.28 to 4.11 µm at the idler beam wavelength was achieved...
this paper emphasizes on the interface complexity — one of the most influential factors affecting Web Services invocation performance. Our ultimate goal is to propose a novel and versatile model to measure the interface complexity. First we introduce the term WSDL2Java Cost to measure the overall cost for converting a WSDL file into server-side Java source code. Then we conduct myriads of experiments...
Saturable absorption of graphene was experimentally and theoretically investigated in femtosecond time regime with the z-scan technique. The initial ultrafast carrier relaxation time was determined to be ∼8(±3) fs. Such ultrafast dynamics is far beyond the time resolution of other ultrafast techniques with typical hundred fs laser pulses. Our results strongly suggest that graphene is an excellent...
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