An efficient algorithm and FPGA implementation of video luminance transient improvement

<正> In this paper,a high-performance and low-complexity luminance transient improvement (LTI) algorithmis proposed and efficiently implemented on field programmable gate array (FPGA) devices,whichcan be widely used to enhance the sharpness of digital video.The proposed algorithm generates the correctionsignal by using the difference of the outputs of two Gaussian filters with different variances,andthen modulates the correction signal adaptively according to the local contrast information of video frames.A 2-D min/max nonlinear filter is employed to suppress overshoots around edges.The proposed algorithmis thoroughly confirmed by experiments and compared with other algorithms on images,which producessteeper edges and better visual quality while suppressing noise and artifacts.And the hardware architecturesuitable for FPGA implementation is optimized based on the property of the algorithm and proves tobe effective and efficient in many respects,such as resource consumption,performance and reconfigurability.The specific implementation details on both Xilinx and Altera FPGA devices are also described inthis paper.     

矿井瓦斯涌出量建模预测

针对矿井瓦斯涌出量影响因素复杂,数据序列波动性较大,灰色GM(1,1)预测模型精度低,本身存在一定缺陷的特点,将自记忆性原理引人灰色系统理论,建立了矿井瓦斯涌出量预测的灰色自记忆预测模型。经在韩城下峪口煤矿应用表明,该模型具有预测精度高,稳定性好的特点。     

Onset of Asian desertification by 22 Myr ago inferred from loess deposits in China

The initial desertification in the Asian interior is thought to be one of the most prominent climate changes in the Northern Hemisphere during the Cenozoic era. But the dating of this transition is uncertain, partly because desert sediments are usually scattered, discontinuous and difficult to date. Here we report nearly continuous aeolian deposits covering the interval from 22 to 6.2 million years ago, on the basis of palaeomagnetic measurements and fossil evidence. A total of 231 visually definable aeolian layers occur as brownish loesses interbedded with reddish soils. This new evidence indicates that large source areas of aeolian dust and energetic winter monsoon winds to transport the material must have existed in the interior of Asia by the early Miocene epoch, at least 14 million years earlier than previously thought. Regional tectonic changes and ongoing global cooling are probable causes of these changes in aridity and circulation in Asia.     

Optimal design of broadband loaded wire antennas based on genetic algorithm

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Antiphospholipid syndrome：a survey of clinical characters in ten cases

Objective: To gain further understanding of the antiphospholipid syndrome(APS) . Methods : Analysing clinical and laboratory data on ten cases of APS. Results: Thrombocytopenia appeared in all cases.Venous thrombi of limbs appeared in five eases and neurological abnormalities in two cases. Renal impairments were found in three cases. One case manifested left renal venous thrombi and the other two cases thrombotic microangiopathy. Budd-Chiari syndrome was found in one case. One of the ten cases was catastrophic APS(CAPS) presented as acute diffuse swelling, cyanosis, pain, ischemia and necrosis in fingers and limbs,recurrem shock, ascites, hepatic and respiratory dysfunction. Anticoagulams and corticosteroids could be effective for dealing with APS. It was critical to treat catastrophic APS with anticoagulants or plasmapheresis as early as possible. Conclusions: APS shows variable manifestations for good prognosis, but catastrophic APS has fatal risk. The main treatment for APS is the use of anticoagulams and immunosuppressives.     

GFFD： Generalized free-form deformation with scalar fields

The novel free-form deformation (FFD) technique presented in the paper uses scalar fields definedby skeletons with arbitrary topology. The technique embeds objects into the scalar field by assigning a field value to each point of the objects. When the space of the skeleton is changed, the distribution of the scalar field changes accordingly, which implicitly defines a deformation of the space. The generality of skeletons assures that the technique can freely define deformable regions to produce a broader range of shape deformations.     

An Information Theory Approach to the Data Compression and Imaging System for Synthetic Aperture Radar （SAR）

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Problems in wavelet analysis of hydrologic series and some suggestions on improvement

Applying the wavelet theory and methods to investigate the hydrologic processes such as precipitation and runoff is a hot field. However, several aspects in research are usually ignored: the effect of admissible condition of wavelet functions and the disturbance of noises for the detection of periods, the effect of the length of a hydrologic time-series on the final result, and the choice between the anomaly and the original time series for wavelet analysis. In this paper, these issues are fully discussed. Precipitation data from Lanzhou Precipitation Station are taken for case study. The result indicates that in the wavelet analysis of hydrologic series, denoise methods should be used to eliminate the influence of noises. The MexHat wavelet function satisfies the admissible condition, which ensures that the periodic properties of hydrologic processes can be well represented by using the MexHat wavelet for decomposition. The affected range of hydrologic series which should be discarded before analysis is given. It is also suggested that the anomaly series should be used to highlight the actual undulation of the hydrologic series.     

Comparison of methods for determining orthotropic axes in 3D femur remodeling

The density distribution and internal structure of trabecular bone are modulated by local mechanical environment. In this study, an orthotropic adaptation algorithm was applied to the 3D femur model to simulate the variations of stiffness and orientation of trabecular bone under multi-loading conditions. This algorithm includes the determination of orthotropic axes and the stiffness modification of trabecular bone. Three methods were used to determine the orthotropic axes, i.e. the maximal cycle method, the stress maximum method, and the composite method. We found that the composite method was better than the other two. Firstly, the characteristics of density distribution obtained by using the composite method agreed better with those in real proximal femur. Secondly, the material orientation aligned with the known trabeculaer pattern. Finally, the ratios of the longitudinal modulus to the transverse modulus were also shown to be realistic in three local regions of the proximal femur.     

The timing of graphic, phonological and semantic activation of high and low frequency Chinese characters: An ERP study

Two event-related potential (ERP) experiments were performed to compare the time course of graphic, semantic and phonological activation of high and low frequency Chinese characters. In Experiment 1, for high frequency materials, graphic priming produced smaller P200 and N400, while semantic priming produced smaller N400 only, but there were no homophonic priming compared to unrelated pairs. In Experiment 2, for low frequency materials, graphic priming produced a smaller P200 and N400, homophonic priming produced an increased P200 and smaller N400 and semantic priming produced a moderately reduced N400 compared to unrelated pairs. The results suggest that there are some differences of activating lexical information of high and low frequency Chinese characters. Graphic activation emerges first, regardless of frequency. For high frequency characters, semantic activation was found, but there is no phonological activation. Whereas for low frequency characters, phonological activation emerges before semantic activation.