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Image decomposing for inpainting using compressed sensing in DCT domain

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Frontiers of Computer Science 2014年第6期8卷 905-915页

作者： Qiang LI Yahong HAN Jianwu dang School of Computer Science and Technology Tianjin University Tianjin 300072 China Tianjin Key Laboratory of Cognitive Computing and Application Tianjin University Tianjin 300072 China School of Information Science Japan Advanced Institute of Science and Technology Ishikawa 923-1192 Japan

Inpainting images with occlusion or corruption is a challenging task. Most existing algorithms are pixel based, which construct a statistical model from image features. However, in these algorithms, the frequency component is not sufficiently addressed. In this paper, we propose a novel algorithm that utilizes compressed sensing （CS） in frequency domain to reconstruct corrupted images. In order to reconstruct image, we first decompose the image into two functions with different basic characteristics - structure component and textual component. We seek a sparse representation for the functions and use the DCT coefficients of this representation to generate an over-complete dictionary. Experimental results on real world datasets demonstrate the efficacy of our method in image inpainting. We compare our method with three state-of-the-art inpalnting algorithms and demonstrate its advantages in terms of both quantitative and qualitative aspects.

关键词： image inpainting compressed sensing image decomposing discrete cosine transform

Thermal Analysis and Identification of Potential Fire-proof Energy Building Material Based on Artificial Leather

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Journal of Thermal Science 2019年第1期28卷 88-96页

作者： MA Yujie dang Xugang SHAN Zhihua The Key Laboratory of Leather Chemistry and Engineering (Sichuan University) Ministry of Education School of Chemistry and Materials Science Sichuan Normal University

Artificial leather fire-proof materials have obtained a good market due to stable production quality and low production price. Three kinds of artificial leather materials(polyvinyl chloride artificial leather(PVC), polyurethane artificial leather(PU) and polyurethane/polyvinyl chloride artificial leather(PU/PVC)) have been investigated, and then seven analysis methods were introduced to identify the materials. Thermo-gravimetric analysis indicated the materials had fine thermal stability. Fire-proof testing revealed the artificial leather materials had good flame retardancy, which could improve the applicability of fire-proof building materials. Tearing examination results indicated that there was a clear distinction between PVC and PU. The PU displayed significant differences compared with PVC or PVC/PU through pH indicator to observe the color of the pyrolysis gas aqueous solution. The dissolution tests results showed that cyclohexanone, dichloromethane and dimethylformamide(DMF) were efficient solvents that could be used for identifying PVC, PU and PU/PVC. The ATR-FTIR, a way to provide the high discriminating ability for identifying artificial leathers, indicated that the artificial leathers had different infrared characteristic peaks. In addition, the main compositive materials of the artificial leathers could be inferred by the relative contents analysis of N and Cl in artificial leathers.

关键词： polyvinyl chloride polyurethane artificial leather identification ATR-FTIR

RANDOM EVOLVING NETWORKS UNDER THE DIAMETER AND AVERAGE CONNECTIVITY CONSTRAINT

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Journal of Systems Science and Systems Engineering 2007年第1期16卷 107-112页

作者： Jianguo LIU Zhongtuo WANG Yanzhong dang Institute of System Engineering Dalian University of Technology Dalian 116023 PR China

In this paper, under the constraint that the average distance and the average degree （k） remain approximately constant, we studied a random scale-free network model. We found that, if the network maintains the form of its degree distribution and the maximal degree kc is N-dependent cutoff function kc（N）〈 N, the degree distribution would be approximately power-law with an exponent between 2 and 3. The distribution exponent has little relationship with the average degree, denoted by （k）. The diameter constraint can be interpreted as an environmental selection pressure, which could explain the scale-free nature of networks. The numerical results indicate that, under the diameter constraint, the preferential attachment can produce the cutoff function kc（N）〈 N and power-law degree distribution.

关键词： Scale-free networks diameter average connectivity

Property of Van Hove Critical Points in Fractional-Dimensional Space

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Chinese Physics Letters 1993年第7期10卷 385-388页

作者： YU Zhaoxian MO dang Department of Physics Zhongshan UniversityGuangzhou 510275

The model of fractional-dimensional space is used to study dielectric function associated with electron interband transitions near a Van Hove critical point in anisotropic *** fractional derivative spectra(FDS)method,it is found that in fractional-dimensional space only a minimum yields a symmetric Lorentzian line shape in FDS but a maximum does not.

关键词： fractional Hove transitions

Experimental Study on Thermal Management of Cylindrical Li-ion Battery with Flexible Microchannel Plates

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Journal of Thermal Science 2020年第4期29卷 1001-1009页

作者： WEI Liting JIA Li AN Zhoujian dang Chao Institute of Thermal Engineering School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale Beijing 100044China

A novel thermal management system of cylindrical Li-ion battery with the liquid cooling in flexible microchannel plate was established in the study. The experiments were conducted with R141 b in flexible microchannel plates. The cooling system with the flexible aluminum microchannels can effectively transfer heat from battery to the cooling refrigerant R141 b based on flow boiling. A battery module with five cells along flow channel was chosen to study the effects of contact surface area and mass flux on the thermal performance and electrochemical characteristics in the experiments. Three types of structure with different contact areas were studied and their performances were compared with the experiments without cooling structures. The experiments were carried out at the same discharge rate with the inlet mass flow rates of 0–10 kg/h. For the inlet mass flow rate of 5.98 kg/h, the surface temperature and temperature uniformity of battery were the best, and the output voltage and capacity of batteries were higher than those under other mass flow rates. With given inlet mass flow rates, the five series cells exhibited different electrochemical performances, including output voltage and discharge capacity, due to the different refrigerant flow states in the microchannels. Finally, an optimal design was presented with thermal performances, macroscopic electrochemical characteristics, inlet mass flow rates and cooling performance taken into consideration.

关键词： thermal management Li-ion battery flexible microchannels contact area

Characterizing the complete mitochondrial genome of Psephenothrips eriobotryae dang&Qiao(Thysanoptera:Phlaeothripidae)with massive gene arrangement in Phlaeothripidae

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Zoological Systematics 2024年第2期49卷 116-128页

作者： Lihong dang Chengwen Li Dongxue Wang Yuxin Gao Linpeng Zhao Bin Zhang School of Biological Science&Engineering Shaanxi University of TechnologyHanzhong 723000China Engineering Research Center of Quality Improvement and Safety Control of Qinba Special Meat Products Universities of Shaanxi ProvinceHanzhong 723000China Shaanxi Changqing National Nature Reserve Changqing JiayuanNo.176Hanzhong 723000China College of Life Sciences&Technology Inner Mongolia Normal UniversityHohhot 010022China

Each species within the order Thysanoptera has a distinct mitochondrial gene order displaying a high level of gene rearrangement,particularly massive in *** understand the evolutionary patterns of rearrangement in this family,we sequenced the complete mitochondrial genome of Psephenothrips eriobotryae,a notable potential pest of loquat *** mitogenome is a circular DNA molecule(15,413 bp in size)composed of 37 genes:13 PCGs,22 tRNAs,two rRNAs,and two putative control regions(CRs).By comparing with the ancestral mitogenome of arthropods,*** exhibits notable gene rearrangement ***,it shares four conserved gene blocks with three closely related species in *** the phylogenetic tree,*** was clustered with these three leaffeeding Phlaeothripinae *** presence of more similar conserved gene blocks probably indicates a strong correlation between gene rearrangements and the phylogeny within ***,the mitogenome of *** shows some characteristics:(a)two putative CRs in which CR2 is the copy of partial CR1 with 99.62%sequence similarity,and CR1 consists of two 237 bp repeat unites;(b)high A+T content of 82.6%in overall base composition;(c)trn S1 lacking a complete dihydrouridine(DHU)arm;(d)the protein coding gene,atp8 started with TTG instead of the more common ATN,while nad3 terminated by TAG rather than TAA;(e)translocations and inversions observed in fifteen of the 37 genes.

关键词： Mitogenome structure phylogenetic relationships Liothrips-lineage repeat regions

Triad-displaced ULAs configuration for non-circular sources with larger continuous virtual aperture and enhanced degrees of freedom

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Journal of Systems Engineering and Electronics 2024年第1期35卷 81-93页

作者： SHAIKH Abdul Hayee dang Xiaoyu HUANG Daqing College of Electronic and Information Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China

Non-uniform linear array(NULA)configurations are well renowned due to their structural ability for providing increased degrees of freedom(DOF)and wider array aperture than uniform linear arrays(ULAs).These characteristics play a significant role in improving the direction-of-arrival(DOA)estimation ***,most of the existing NULA geometries are primarily applicable to circular sources(CSs),while they limitedly improve the DOF and continuous virtual aperture for noncircular sources(NCSs).Toward this purpose,we present a triaddisplaced ULAs(Tdis-ULAs)configuration for *** TdisULAs structure generally consists of three ULAs,which are appropriately *** proposed antenna array approach fully exploits the non-circular characteristics of the *** the same number of elements,the Tdis-ULAs design achieves more DOF and larger hole-free co-array aperture than its sparse array ***,the number of uniform DOF,optimal distribution of elements among the ULAs,and precise element positions are uniquely determined by the closed-form ***,the proposed array also produces a filled resulting *** simulations are conducted to show the performance advantages of the proposed Tdis-ULAs configuration over its counterpart designs.

关键词： direction-of-arrival(DOA)estimation sparse array non-circular source(NCS) sum co-array difference co-array degrees of freedom(DOF)

Bi-extrapolated subgradient projection algorithm for solving multiple-sets split feasibility problem

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Applied Mathematics(A Journal of Chinese Universities) 2014年第3期29卷 283-294页

作者： dang Ya-zheng GAO Yan College of Computer Science and Technology (Software College) Henan Polytechnic University School of Management University of Shanghai for Science and Technology

This paper deals with a bi-extrapolated subgradient projection algorithm by intro- ducing two extrapolated factors in the iterative step to solve the multiple-sets split feasibility problem. The strategy is intend to improve the convergence. And its convergence is proved un- der some suitable conditions. Numerical results illustrate that the bi-extrapolated subgradient projection algorithm converges more quickly than the existing algorithms.

关键词： Multiple-sets split feasibility problem subgradient accelerated iterative algorithm convergence.

Frictional behavior of planar and rough granite fractures subjected to normal load oscillations of different amplitudes

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第3期14卷 746-756页

作者： Wengang dang Kang Tao Xinfan Chen School of Civil Engineering Sun Yat-sen UniversityZhuhai519082China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou221116China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai519082China

The dynamic frictional behaviors of natural discontinuities(joints,fractures,faults)play an important role in geohazards assessment;however,the mechanisms of the dynamic fault weakening/strengthening are still *** this paper,a dynamic shear box was used to perform direct shear tests on saw-cut(planar)and natural(rough)granite fractures,with different normal load oscillation *** on the recorded shear forces and normal displacements,the shear forces,apparent friction coefficients and normal displacements are found to change periodically with oscillated normal loads and are characterized by a series of time *** observed changing patterns are similar for the rough and planar *** with the test data under constant normal load(CNL),small/large normal load oscillation amplitude enhances/reduces the peak shear strength,with a critical *** magnitude of critical normal load oscillation for the rough fractures is smaller than the planer *** results imply that dynamic fault weakening/strengthening can be achieved by both normal load oscillation amplitudes and slip surface *** rough fractures with larger normal oscillation amplitude can easily cause frictional weakening under stress disturbance.

关键词： Direct shear test Normal load oscillation fracture roughness Critical oscillation amplitude Dynamic weakening/strengthening