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Sparse representation scheme with enhanced medium pixel intensity for face recognition

CAAI Transactions on Intelligence Technology 2024年第1期9卷 116-127页

作者： Xuexue Zhang Yongjun Zhang Zewei Wang Wei Long weihao gao Bob Zhang State Key Laboratory of Public Big Data Institute for Artificial IntelligenceCollege of Computer Science and TechnologyGuizhou UniversityGuiyangGuizhouChina Department of Computer and Information Science University of MacaoAvenida da UniversidadeTaipaMacaoChina

Sparse representation is an effective data classification algorithm that depends on the known training samples to categorise the test *** has been widely used in various image classification *** in sparse representation means that only a few of instances selected from all training samples can effectively convey the essential class-specific information of the test sample,which is very important for *** deformable images such as human faces,pixels at the same location of different images of the same subject usually have different ***,extracting features and correctly classifying such deformable objects is very ***,the lighting,attitude and occlusion cause more *** the problems and challenges listed above,a novel image representation and classification algorithm is ***,the authors’algorithm generates virtual samples by a non-linear variation *** method can effectively extract the low-frequency information of space-domain features of the original image,which is very useful for representing deformable *** combination of the original and virtual samples is more beneficial to improve the clas-sification performance and robustness of the ***,the authors’algorithm calculates the expression coefficients of the original and virtual samples separately using the sparse representation principle and obtains the final score by a designed efficient score fusion *** weighting coefficients in the score fusion scheme are set entirely ***,the algorithm classifies the samples based on the final *** experimental results show that our method performs better classification than conventional sparse representation algorithms.

关键词： computer vision face recognition image classification image representation

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基于可靠度理论的桥梁结构安全性能评估方法

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工程技术研究 2024年第6期9卷 16-18页

作者：南鹏鹏李滟桉李章军丁孝伟高伟皓中建国际建设有限公司北京100020

在大型桥梁的设计、施工和运维全过程中,由于涉及众多的构件和参数,难以保证结构安全性能评估的效率和精度。文章提出了基于可靠度理论的桥梁结构安全性能评估方法,首先分析了影响结构性能的主要因素并提出了桥梁结构安全智能评估方法... 详细信息

在大型桥梁的设计、施工和运维全过程中,由于涉及众多的构件和参数,难以保证结构安全性能评估的效率和精度。文章提出了基于可靠度理论的桥梁结构安全性能评估方法,首先分析了影响结构性能的主要因素并提出了桥梁结构安全智能评估方法。对比发现,文章提出的智能评估方法相较于传统的有限元方法节省了70%的计算时间,且精度超过95%,该方法将安全评估过程中的物理问题转化为数学问题,为桥梁的安全评估提供了新的思路。

关键词：大跨度桥梁力学分析可靠度理论安全评估

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Microbiota in colorectal cancer related to liver metastasis

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Chinese Journal of Cancer Research 2024年第1期36卷 17-24页

作者： Peijun Wei Weiming Han Zitong Zhang Xue Tian Chen Yang Qiaoxuan Wang weihao Xie Ying Liu Yuanhong gao Hui Chang Department of Radiation Oncology State Key Laboratory of Oncology in South ChinaGuangzhou 510060China Guangdong Provincial Clinical Research Center for Cancer Guangzhou 510060China Sun Yat-sen University Cancer Center Guangzhou 510060China Department of Pediatric Oncology State Key Laboratory of Oncology in South ChinaGuangzhou 510060China

The prevalence of colorectal cancer(CRC) is increasing annually and metastasis is the principal cause of death in patients with CRC, with the liver being the most frequently affected site. Many studies have shown a strong interplay between the gut flora, particularly Fusobacterium nucleatum(F. nucleatum), Escherichia coli, and Bacteroides fragilis, and the development of gut tumors. Some strains can induce gut inflammation and produce toxins that directly harm gut epithelial cells, ultimately accelerating the onset and progression of CRC. However,little clinical evidence exists on the specific interplay between the gut microflora and colorectal cancer liver metastasis(CRLM). Some research showed the existence of viable F. nucleatum in distant metastasis of ***, gut microbiota products, such as lipopolysaccharides, sodium butyrate, and protein cathepsin K, were also found to affect the development of CRC. This article summarizes the mechanism and research status of the interplay between gut microflora and CRLM, discusses the importance of gut microflora in the treatment of CRLM, and proposes a new approach to understanding the mechanism of CRLM and potential treatments for the microbiome. It is anticipated that the gut microbiota will be a formidable therapeutic and prophylactic tool for treating and preventing CRLM.

关键词： Gut microbiota liver metastasis colorectal cancer

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Pentacoordinate Phosphoranes as Versatile Reagents in Fluoroalkylation Reactions

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CCS Chemistry 2024年第1期6卷 165-176页

作者： Huanhuan Song weihao Li Xiaoying Wang Kaiteng Wang Jingwen Li Shuai Liu Pin gao Xin-Hua Duan Jinbo Hu Mingyou Hu School of Chemistry Engineering Research Center of Energy Storage Materials and DevicesMinistry of EducationXi’an Key Laboratory of Sustainable Energy Material ChemistryXi’an Jiaotong UniversityXi’an 710049 Key Laboratory of Organofluorine Chemistry Center for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200032

A general method for the synthesis of bench-stable bis(difluoromethyl)pentacoordinate phosphoranes has been *** reaction is rapid,operationally simple,and easily *** pentacoordinate phosphoranes can generate both difluoromethyl radical(·CF_(2)H)and difluorocarbene(:CF_(2))***,a variety of fluoroalkylation transformations havebeen achieved by·CF_(2)H,such asoxidativedifluoromethylation of electron-deficient heterocycles,nickel/photoredox dual-catalyzed difluoromethylation of aryl bromides,and photoredox difluoromethylation of alkenes,or by:CF_(2),such as gem-difluorocyclopropanation of alkenes,base-promoted difluoromethylation of heteroatom nucleophiles,Pd-catalyzed difluoromethylation of arylboronic acids,and Cu-mediated trifluoromethylation of aryl iodides(via:CF_(2) and recombined CF_(3)-).These fluoroalkylation methods have been successfully applied to late-stage fluoroalkylation of drugs and drug-like molecules.

关键词： pentacoordinate phosphorane difluoromethyl radical difluorocarbene difluoromethylation fluoroalkylation

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复杂技术网络化布局三维风险及其规避策略研究

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科技进步与对策 2016年第2期33卷 6-12页

作者：任慧邵伟高伟浩江西师范大学财政金融学院江西南昌330022

复杂技术如同一个多元技术网络系统,其网络化布局存在潜在的横向风险、纵向风险及结构风险。对应三维度风险分析,从网络合作规则设计、技术网络治理与技术网络资金支撑体系构建以及产权制度创新3个方面,提出了应对复杂技术网络化布局风... 详细信息

复杂技术如同一个多元技术网络系统,其网络化布局存在潜在的横向风险、纵向风险及结构风险。对应三维度风险分析,从网络合作规则设计、技术网络治理与技术网络资金支撑体系构建以及产权制度创新3个方面,提出了应对复杂技术网络化布局风险的规避策略与制度设计,对了解我国复杂技术创新网络以及加强网络风险治理具有一定的借鉴意义。

关键词：复杂技术网络网络风险横向风险纵向风险结构风险风险规避

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内涵、效率与测量:创新网络结构研究述评

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情报杂志 2015年第12期34卷 192-199页

作者：任慧朱美容高伟浩江西师范大学财政金融学院南昌330022

高效的创新网络结构能够促进创新网络合作绩效。技术复杂化与创新网络化促使网络结构治理成为现今技术创新网络研究的热门问题。以近年来国内外针对网络结构问题的研究作为评述对象,以网络结构尤其是合作创新网络结构的效率为突破口,考... 详细信息

高效的创新网络结构能够促进创新网络合作绩效。技术复杂化与创新网络化促使网络结构治理成为现今技术创新网络研究的热门问题。以近年来国内外针对网络结构问题的研究作为评述对象,以网络结构尤其是合作创新网络结构的效率为突破口,考虑什么样的创新网络结构才是高效的核心问题加以综述。综述分三方面:第一,学界如何界定创新网络结构的内涵;第二,从三个维度分析创新网络结构效率;第三,网络结构效率测量方法与指标等。创新网络治理应该从动态优化网络结构角度加以深度研究。

关键词：创新网络网络结构网络结构效率网络治理

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我国中部地区教育投入与经济增长关系的实证分析——基于VAR模型

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宁波广播电视大学学报 2016年第3期14卷 48-51页

作者：高伟浩江西师范大学财政金融学院江西南昌330022

中部地区的崛起离不开人才,人才的培养离不开教育。文章通过分析1996-2011年中部地区的教育经费总量(EDU)和国内生产总值(GDP)的变化趋势,运用VAR模型和因果关系检验理论对中部地区教育支出与经济增长之间的关系进行实证研究。结果表明... 详细信息

中部地区的崛起离不开人才,人才的培养离不开教育。文章通过分析1996-2011年中部地区的教育经费总量(EDU)和国内生产总值(GDP)的变化趋势,运用VAR模型和因果关系检验理论对中部地区教育支出与经济增长之间的关系进行实证研究。结果表明,教育支出对经济增长的影响是明显的,教育投入冲击对GDP的作用较强,GDP冲击对教育投入相对较弱。结果证明教育投入是经济增长的明显动因,而经济增长没有带来教育投入明显增加。

关键词：中部地区教育投入经济增长 VAR模型

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Record-high efficiency perovskite LEDs achieved by accelerating radiative recombination

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Science China Materials 2024年第9期67卷 3039-3040页

作者： Feng gao Department of Physics Chemistry and BiologyLinköping UniversityLinköping58183Sweden

Light-emitting diodes(LEDs)have revolutionized the lighting and displays due to their superior energy *** increasing demand for more efficient and brighter thin-film LEDs in flat-panel displays and solid-state lighting applications has driven extensive research into perovskite materials,which show great promise for high brightness and efficiency.

关键词： lighting radiative high

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Stress tensor determination by modified hydraulic tests on pre-existing fractures:Method and stress constraints

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1637-1648页

作者： Guiyun gao Chenghu Wang Ke gao National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing100085China Beijing Engineering Research Center of Earthquake Observation Beijing100085China Key Laboratory of Compound and Chained Natural Hazards Dynamics Ministry of Emergency Management of ChinaBeijing100085China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen518055China

The hydraulic testing of pre-existing fractures(HTPF)is one of the most promising in situ stress measurement methods,particularly for three-dimensional stress tensor ***,the stress tensor determination based on the HTPF method requires at least six tests or a minimum of 14-15 tests(under different conditions)for reliable *** this study,we modified the HTPF method by considering the shear stress on each pre-existing fracture,which increased the number of equations for the stress tensor determination and decreased the number of tests *** shear stresses were attributed to different fractures by random sampling;therefore,the stress tensors were obtained by searching for the optimal solution using the least squares criterion based on the Monte Carlo ***,we constrained the stress tensor based on the tensile strength criterion,compressive strength criterion,and vertical stress *** inverted stress tensors were presented and analyzed based on the tensorial nature of the stress using the Euclidean mean stress *** stress-measurement campaigns in Weifang(Shandong Province,China)and Mercantour road tunnel(France)were implemented to highlight the validity and efficiency of the modified HTPF(M-HTPF)*** results showed that the M-HTPF method can be applied for stress tensor inversion using only three to four tests on pre-existing fractures,neglecting the stress *** inversion results were confined to relatively small distribution dispersions and were significantly reliable and stable due to the shear stresses on the fractures and the stress constraints *** M-HTPF method is highly feasible and efficient for complete stress tensor determination in a single borehole.

关键词： Stress tensor Hydraulic tests on pre-existing fractures Mean stress Stress constraint Hydraulic fracturing

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Thermal and mechanical behavior of casting copper alloy wheel during wheel and belt continuous casting process

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China Foundry 2024年第1期21卷 82-90页

作者： Kun gao Yan Peng School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

To investigate the thermal and mechanical behavior of casting wheel,a two-dimensional thermoelastic-plastic finite element model was used to predict the temperature,stress and distortion distribution of the casting wheel during the wheel and belt continuous casting *** effects of grinding thickness and casting speed on the thermal and mechanical behaviors of the center of the hot face of the casting wheel were discussed in *** each rotation,the casting wheel passes through four different spray *** results show that the temperature distribution of the casting wheel in different spray zones is similar,the temperature of the hot face is the highest and the temperature reaches the peak in the spray zoneⅢ.The stress and distortion depend on the temperature distribution,and the maximum stress and distortion of the hot face are 358.2 MPa and 1.82 mm,*** temperature at the center of the hot face decreases with increasing grinding thickness and increases with increasing casting speed.

关键词： casting wheel finite element model grinding thickness casting speed hot face spray zones

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