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Adaptive sparse and dense hybrid representation with nonconvex optimization

Frontiers of Computer Science 2020年第4期14卷 65-78页

作者： xuejun wang Feilong CAO Wenjian wang School of Computer Science and Technology Shanxi UniversityTaiyuan030006China School of Science China Jiliang UniversityHangzhou310018China Key Laboratory of Computational Intelligence and Chinese Information Processing of Ministry of Education Taiyuan030006China

Sparse representation has been widely used in signal processing,pattern recognition and computer vision *** achievements have been made in both theoretical researches and practical ***,there are two limitations on the application of *** is that sufficient training samples are required for each class,and the other is that samples should be *** order to alleviate above problems,a sparse and dense hybrid representation(SDR)framework has been proposed,where the training dictionary is decomposed into a class-specific dictionary and a non-class-specific *** putsℓ1 constraint on the coefficients of class-specific ***,it over-emphasizes the sparsity and overlooks the correlation information in class-specific dictionary,which may lead to poor classification *** overcome this disadvantage,an adaptive sparse and dense hybrid representation with non-convex optimization(ASDR-NO)is proposed in this *** trace norm is adopted in class-specific dictionary,which is different from general *** doing so,the dictionary structure becomes adaptive and the representation ability of the dictionary will be ***,a non-convex surrogate is used to approximate the rank function in dictionary decomposition in order to avoid a suboptimal solution of the original rank minimization,which can be solved by iteratively reweighted nuclear norm(IRNN)*** experiments conducted on benchmark data sets have verified the effectiveness and advancement of the proposed algorithm compared with the state-of-the-art sparse representation methods.

关键词： sparse representation trace norm nonconvex optimization low rank matrix recovery iteratively reweighted nuclear norm

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Maximal inequalities for demimartingales and their applications

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Science China Mathematics 2009年第10期52卷 2207-2217页

作者： wang xuejun HU ShuHe School of Mathematical Science Anhui UniversityHefei 230039China

In this paper, we establish some maximal inequalities for demimartingales which generalize and improve the results of Christofides. The maximal inequalities for demimartingales are used as key inequalities to establish other results including Doob’s type maximal inequality for demimartingales, strong laws of large numbers and growth rate for demimartingales and associated random variables. At last, we give an equivalent condition of uniform integrability for demisubmartingales.

关键词： maximal inequality demimartingales associated random variables growth rate 60E15 60F15

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Numerical simulation of turbulent flow in helically coiled open-channels with compound cross-sections

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Science China(Technological Sciences) 2004年第1期47卷 97-111页

作者： SHAO xuejun wang Hong CHEN Zhi Department of Hydraulic Engineering Tsinghua University Beijing 100084 China Department of Hydraulic Engineering Tsinghua University Beijing 100084 China Department of Hydraulic Engineering Tsinghua University Beijing 100084 China

Turbulence structure in a helically coiled open channel flow is numerically simulated using three different turbulence models--the Launder and Ying model, the Naot and Rodi model, and the nonlinear k-ε Model (SY model). Simulation results were compared with observation of (i) turbulent flows in alternating point-bar type channel bends with rectangular sections, and (ii) straight open channel flows with compound cross-sections. Based on calculations of the impact of various channel curvatures on turbulence characteristics, accuracy of the three turbulence models was analyzed with observed data as a qualitative reference. It has been found out that the Launder and Ying model and the nonlinear k-ε Model are able to predict the same general trend as measured data, and the simulation of the effect of the centrifugal force on the formation of secondary currents produces a correct pattern.

关键词： curved open-channel turbulent flow, compound cross-section, orthogonal curvilinear coordinate system.

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Chow-Type Maximal Inequality for Conditional Demimartingales and Its Applications

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Chinese Annals of Mathematics,Series B 2015年第6期36卷 957-968页

作者： xuejun wang Shijie wang Chen XU Shuhe HU School of Mathematical Sciences Anhui University

In this paper,the Chow-type maximal inequality for conditional demimartingales is *** using the Chow-type maximal inequality,the authors provide the maximal inequality for conditional demimartingales based on concave ... 详细信息

关键词： Conditional demimartingales Chow-type maximal inequality ConcaveYoung functions

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Visualization and Experiment of Tip Vortex Phenomenon in Cooling Fan using Digital Particle Image Velocimetry

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Journal of Thermal Science 2004年第4期13卷 321-327页

作者： Junlong Xie xuejun wang Guanghui Wu Keqi Wu Huazhong Univ Sci & Technol Sch Energy & Power Engn Wuhan 430074 Hubei Province Peoples R China

The Digital Particle Image Velocimetry (DPIV) is an efficient method for measuring the internal flow field of a low-speed cooling fan. This paper studied the velocity field by means of PIV technology for a leading edge swept axial-flow fan without casing, and the tip vortex phenomenon was observed. Time-averaged velocity measurements were taken near the pressure surface, the suction surface and the tip of blade, etc. Moreover, the flow characteristics were visualized using numerical techniques. Experimental results showed that this tip vortex existed at the leading edge of the blade. The generating, developing and dissipating evolvement process of the tip vortex from the blade leading edge to downstream were discussed in detail. In addition, by comparing DPIV results and numerical results, a good agreement between them indicated a possibility to predict flow field using CFD tools. The experimental data provided in this paper are reliable for improving the aerodynamic characteristics of the open axial fan.

关键词： flow visualization open axial-flow fan digital particle image velocimetry tip vortex.

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Unintended nutrient imbalance induced by wastewater effluent inputs to receiving water and its ecological consequences

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Frontiers of Environmental Science & Engineering 2022年第11期16卷 273-275页

作者： Yindong Tong xuejun wang James J.Elser School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China College of Urban and Environmental Sciences Peking UniversityBeijing 100871China Flathead Lake Biological Station University of MontanaPolsonMT 59860USA

Eutrophication is the most widespread water quality issue *** date,most efforts to control eutrophication have focused on reductions of external nutrient inputs,yet importance of nutrient stoichiometry and subsequent shift in plankton composition in aquatic ecosystem has been largely *** address eutrophication,improved sanitation is one of the United Nations Sustainable Development Goals,spurring the constructions of wastewater treatment facilities that have improved water quality in many lakes and ***,control measures are often targeted at and effective in removing a single nutrient from sewage and thus are less effective in removing the others,resulting in the changes of nutrient *** general,more effective phosphorus removal relative to nitrogen has occurred in wastewater treatment leading to substantial increases in N/P ratios in effluent relative to the ***,high N/P ratios in receiving waters can impose negative influences on ***,longterm strategies for domestic wastewater management should not merely focus on the total reduction of nutrient discharge but also consider their stoichiometric balances in receiving waters.

关键词： Nutrient stoichiometry Wastewater treatment Ecosystem functioning Water quality management

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A Shot Clustering Based Algorithm for Scene Segmentation

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China Communications 2007年第4期4卷 61-65页

作者： wang xuejun wang Shigang Chen Hexin Jilin Univ Sch Telecommun Engn Changchun 130012 Peoples R China

A scene segmentation method utilizing both visual features and motion features of video is presented in this *** only the visual similarity but also the motion consistency of shots within a scene is considered in clustering shots into *** addition,a method to merge the over-segmented scenes is presented *** the experimental results show the effectiveness of the proposed algorithms.

关键词： scene segmentation shot similarity shot clustering

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Ultrasensitive detection of methamphetamine by antibody-modified transistor assay

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Journal of Semiconductors 2023年第2期44卷 77-83页

作者： Banpeng Cao Changhao Dai xuejun wang Dacheng Wei Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal UniversityNanchang 330013China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200433China

Effective detection of methamphetamine(Met)requires a fast,sensitive,and cheap testing ***,commercially available methods require expensive instruments and highly trained operators,which are time-consuming and ***,an antibody-modified graphene transistor assay is developed for sensitive and minute-level detection of Met in complex *** anti-Met probe captured charged targets within 120 s,leading to a p-doping effect near the graphene *** limit of detection reaches 50 aM(5.0×10^(-17)M)Met in *** graphene transistor would be a valuable tool for Met detection effective prevention of drug abuse.

关键词： graphene field effect transistor biosensor methamphetamine antibody immobilization

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Complete moment convergence for weighted sums of widely orthant-dependent random variables and its application in nonparametric regression models

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Frontiers of Mathematics in China 2022年第4期17卷 571-590页

作者： Lu CHENG Junjun LANG Yan SHEN xuejun wang School of Mathematical Sciences Anhui UniversityHefei230601China

We establish some results on the complete moment convergence for weighted sums of widely orthant-dependent(WOD)random variables,which improve and extend the corresponding results of ***,***,and ***[***.,2019,13(1):251–260].As an application of the main results,we investigate the complete consistency for the estimator in a nonparametric regression model based on WOD errors and provide some simulations to verify our theoretical results.

关键词： Widely orthant-dependent random variables complete moment convergence nonparametric regression model

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Strong Law of Large Numbers for Weighted Sums of Random Variables and Its Applications in EV Regression Models

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Journal of Systems Science & Complexity 2022年第1期35卷 342-360页

作者： PENG Yunjie ZHENG Xiaoqian YU Wei HE Kaixin wang xuejun School of Mathematical Sciences Anhui UniversityHefei 230601China. Wendian College Anhui UniversityHefei 230601China

This paper mainly studies the strong convergence properties for weighted sums of extended negatively dependent(END,for short)random *** sufficient conditions to prove the strong law of large numbers for weighted sums of END random variables are *** particular,the authors obtain the weighted version of Kolmogorov type strong law of large numbers for END random variables as a *** results that the authors obtained generalize the corresponding ones for independent random variables and some dependent random *** an application,the authors investigate the errors-in-variables(EV,for short)regression models and establish the strong consistency for the least square *** studies are conducted to demonstrate the performance of the proposed procedure and a real example is analysed for illustration.

关键词： EV regression models extended negatively dependent random variables strong consistency strong law of large numbers weighted sums

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