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PIECEWISE SPARSE RECOVERY VIA PIECEWISE INVERSE SCALE SPACE ALGORITHM WITH DELETION RULE

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Journal of Computational Mathematics 2020年第2期38卷 375-394页

作者： Yijun Zhong chongjun Li School of Mathematical Sciences Dalian University of TechnologyDalian 116024China

In some applications,there are signals with piecewise structure to be *** this paper,we propose a piecewise_ISS(P_ISS)method which aims to preserve the piecewise sparse structure(or the small-scaled entries)of piecewise *** order to avoid selecting redundant false small-scaled elements,we also implement the piecewise_ISS algorithm in parallel and distributed manners equipped with a deletion *** experiments indicate that compared with alSS,the P_ISS algorithm is more effective and robust for piecewise sparse recovery.

关键词： Inverse scale space Piecewise sparse Sparse recovery Small-scaled entries

The Instability in the Dimensions of Spline Spaces Over T-Meshes with Nested T-Cycles

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Numerical Mathematics(Theory,Methods and Applications) 2019年第1期12卷 187-211页

作者： chongjun Li Pengxiao Wang School of Mathematical Sciences Dalian University of TechnologyDalian 116024China

This paper studies on the dimensions of spline spaces over some given *** the smoothing cofactor-conformality method,we study the instability in the dimensions of the spline spaces over T-meshes with 2-nested and 3-nested *** define a singularity factor of each simple T-cycle,the instability and the structure’s degeneration are associated with the singularity *** order to get a stable dimension formula over T-mesh with a N-nested T-cycle,a constraint on the T-mesh is ***,a possible degeneration for a case of parallel T-cycles is illustrated.

关键词： Spline space smoothing cofactor-conformality method instability in the dimension T-mesh T-cycle

Sparse approximate solution of fitting surface to scattered points by MLASSO model

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Science China Mathematics 2018年第7期61卷 1319-1336页

作者： Yongxia Hao chongjun Li Renhong Wang Faculty of Science Jiangsu University School of Mathematical Sciences Dalian University of Technology

The goal of this paper is to achieve a computational model and corresponding efficient algorithm for obtaining a sparse representation of the fitting surface to the given scattered data. The basic idea of the model is to utilize the principal shift invariant(PSI) space and the l_1 norm minimization. In order to obtain different sparsity of the approximation solution, the problem is represented as a multilevel LASSO(MLASSO)model with different regularization parameters. The MLASSO model can be solved efficiently by the alternating direction method of multipliers. Numerical experiments indicate that compared to the AGLASSO model and the basic MBA algorithm, the MLASSO model can provide an acceptable compromise between the minimization of the data mismatch term and the sparsity of the solution. Moreover, the solution by the MLASSO model can reflect the regions of the underlying surface where high gradients occur.

关键词： sparse solution principle shift invariant space l1 norm minimization alternating direction method multipliers MLASSO model

The Bases of the Non-Uniform Cubic Spline Space S_(3)^(1,2)(Δ_(mn)^((2))

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Numerical Mathematics(Theory,Methods and Applications) 2012年第4期5卷 635-652页

作者： Jiang Qian Renhong Wang chongjun Li College of Sciences Hohai UniversityNanjing 210098China School of Mathematical Sciences Dalian University of TechnologyDalian 116024China

In this paper,the dimension of the nonuniform bivariate spline space S_(3)^(1,2)(Δ_(mn)^((2))is discussed based on the theory of multivariate spline ***,by means of the Conformality of Smoothing Cofactor Method,the basis ofS_(3)^(1,2)(Δ_(mn)^((2))composed of two sets of splines are worked out in the form of the values at ten domain points in each triangular cell,both of which possess distinct local ***,the explicit coefficients in terms of B-net are obtained for the two sets of splines respectively.

关键词： Bivariate spline conformality of smoothing cofactor method B-net nonuniform type-2 triangulation

Current status of municipal wastewater treatment plants in North-east China:implications for reforming and upgrading

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Frontiers of Environmental Science & Engineering 2023年第6期17卷 113-126页

作者： Bin Cui chongjun Zhang Liang Fu Dandan Zhou Mingxin Huo Jilin Engineering Laboratory for Water Pollution Control and Resources Recovery Northeast Normal UniversityChangchun 130117China

Climate affects the natural landscape,the economic productivity of societies,and the lifestyles of its *** also influences municipal wastewater *** processes are widely employed in municipal wastewater treatment plants(WWTPs),and the prolonged cold conditions brought by the winter months each year pose obstacles to meeting the national standards in relatively cold ***,both a systematic analysis of existing technical bottlenecks as well as promising novel technologies are urgently needed for these cold *** North-east China as a case,this review studied and analyzed the main challenges affecting 20 municipal ***,we outlined the currently employed strategies and research issues pertaining to low temperature *** temperatures have been found to reduce the metabolism of microbes by 58%or more,thereby leading to chemical oxygen demand(COD)and NH_(4)^(-)-N levels that have frequently exceeded the national standard during the winter ***,the extracellular matrix tends to lead to activated sludge bulking *** employed strategies to combat these issues include increasing the aeration intensity,reflux volume,and flocculant addition;however,these strategies increase electricity consumption by>42%in the winter ***,the processes of anaerobic ammonium oxidation(anammox),granular sludge,and aerobic denitrification have become the focus of research for overcoming low *** have inspired us to review and propose directions for the further development of novel technologies suitable for cold regions,thereby overcoming the issues inherent in traditional processes that have failed to meet the presently reformed WWTP requirements.

关键词： Low temperature Municipal WWTPs Cold region Electricity consumption Nitrogen removal

Pd films on soft substrates:a visual,high-contrast and low-cost optical hydrogen sensor

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Light(Science & Applications) 2019年第1期8卷 1151-1160页

作者： Xiaoyi She Yang Shen Jianfang Wang chongjun Jin State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China School of Electronics and Information Technology Sun Yat-sen UniversityGuangzhou 510275China Department of Physics the Chinese University of Hong KongShatinHong Kong SARChina

For the rapid development of the hydrogen economy,a reliable and low-cost hydrogen sensor appears to be extremely ***,we first show that a palladium film deposited on polydimethylsiloxane(PDMS)can obtain an exceedingly high-reflectance contrast of 25.78 over the entire visible band upon exposure to 4 vol% hydrogen gas(H2)mixed with nitrogen *** high-reflectance contrast results from the surface deformation induced by the volume inflation after exposure to H2,leading to the transition of the near-specular surface to a diffusing *** addition,a change in brightness is readable by naked eye upon exposure to H2 with various concentrations from 0.6 to 1 vol% under the illumination of a fluorescent ***,this sensor possesses an excellent recyclability and quick response time of a few *** with Pd nanostructure-based hydrogen sensors,this visual,high-contrast and low-cost sensor is of great potential for practical hydrogen sensing.

关键词： deformation cost visual

How China's Belt and Road Initiative Promises to Bring Harmonious Development to the World

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学术界 2018年第12期 272-282页

作者： Zhao chongjun Huang Yongliang School of Foreign Languages Xianyang Normal University Xianyang Shaanxi 712000

With the economic rise of China,Chairman Xi Jinping has been backing the ambitious"Belt and Road Initiative"( BRI) to connect China with the world via land and maritime networks,strengthening the role of China as an effective global power spreading investment and prosperity. The BRI was unveiled under the banner — "harmonious development",however,many viewed the expansion of Chinese influence as a threat to the US hegemony better known as"Washington Consensus". This paper focused on the economic and political opportunities arising from the BRI plan,and moreover,interpreted howthe"Beijing Consensus"promised to promote world develpment.

关键词： harmonious development Belt and Road Initiative Beijing Consensus Washington Consensus international development

Dynamic and steady control of quantum coherence in photonic crystals via the Zeeman effect

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Science China(Physics,Mechanics & Astronomy) 2012年第12期55卷 2300-2304页

作者： CHEN LuZhou HUANG YongGang JIN chongjun WANG XueHua State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and EngineeringSun Yat-Sen UniversityGuang zhou 510275China

The dynamic evolution of a multi-level atom in the three-dimensional photonic crystal under an applied magnetic field is *** combining the Zeeman effect with the photonic band gap effect,the dynamic quantum superposition states and steady quantum coherent trapping states of the atom can be flexibly *** paves the way for coherent manipulation of quantum states in the solid-state system,which has important applications in quantum information processing.

关键词： quantum superposition state control of quantum coherence photonic crystal gap Zeeman effect

An address regional tessellation method for spatial subdivision and geocoding in digital earth system

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International Journal of Digital Earth 2015年第10期8卷 825-839页

作者： Tan Ningsheng Yang chongjun Yang LiuZhong Liu Yuan State Key Laboratory of Remote Sensing Science Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijingChina Graduate School University of Chinese Academy of SciencesBeijingChina Urban-Rural Planning Management Center Ministry of Housing and Urban-Rural Development of the People’s Republic of ChinaBeijingChina

With the increased use of locational information,spatial location referencing and coding methods have become much more important to the mining of both geographical and nongeographical data in digital earth ***,current methods of geocoding,based on reverse lookup of coordinates for a given address,have proven too lossy with respect to administrative and socioeconomic *** paper proposes a spatial subdivision and geocoding model based on spatial address regional tessellation(SART).Given a hierarchical address object definition,and based on the‘region of influence’characteristics of an address,SART creates multiresolution spatial subdivisions by irregular and continuous address *** model reflects most of the geographical features and many of the social and economic implications for a given *** also better reflects the way people understand addresses and spatial *** also propose an appropriate method of geocoding for standard addresses(SART-GC).The codes generated by this method can record address footprints,hierarchical relationships,and spatial scales in a single data ***,by applying our methods to the Shibei District of Qingdao,we demonstrate the suitability of SART-GC for multi-scale spatial information representation in digital earth systems.

关键词： address spatial tessellation spatial reference geocoding digital earth