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Rail Surface Defect Detection Based on Improved UPerNet and Connected Component Analysis

Computers, Materials & Continua 2023年第10期77卷 941-962页

作者： Yongzhi Min Jiafeng li yaxing li School of Automation and Electrical Engineering Lanzhou Jiaotong UniversityLanzhou730070China Gansu Provincial Engineering Research Center for Artificial Intelligence and Graphics&Image Lanzhou Jiaotong UniversityLanzhou730070China State Grid Gansu Electric Power Baiyin Power Supply CompanyBaiyin730900China

To guarantee the safety of railway operations,the swift detection of rail surface defects becomes *** methods of manual inspection and conventional nondestructive testing prove inefficient,especially when scaling to extensive railway ***,the unpredictable and intricate nature of defect edge shapes further complicates detection *** these challenges,this paper introduces an enhanced Unified Perceptual Parsing for Scene Understanding Network(UPerNet)tailored for rail surface defect ***,the Swin Transformer Tiny version(Swin-T)network,underpinned by the Transformer architecture,is employed for adept feature *** approach capitalizes on the global information present in the image and sidesteps the issue of inductive *** model’s efficiency is further amplified by the windowbased self-attention,which minimizes the model’s parameter *** implement the cross-GPU synchronized batch normalization(SyncBN)for gradient optimization and integrate the Lovász-hinge loss function to leverage pixel dependency *** evaluations underscore the efficacy of our improved UPerNet,with results demonstrating Pixel Accuracy(PA)scores of 91.39%and 93.35%,Intersection over Union(IoU)values of 83.69%and 87.58%,Dice Coefficients of 91.12%and 93.38%,and Precision metrics of 90.85%and 93.41%across two distinct *** increment in detection accuracy was *** further practical applicability,we deploy semantic segmentation of rail surface defects,leveraging connected component processing techniques to distinguish varied defects within the same *** computing the actual defect length and area,our deep learning methodology presents results that offer intuitive insights for railway maintenance professionals.

关键词： Rail surface defects connected component analysis Transformer UPerNet

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High-SNR Staining Algorithm for One-Way Wave Equation-Based Modelling and Imaging

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Communications in Computational Physics 2020年第6期28卷 187-206页

作者： yaxing li Xiaofeng Jia Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China National Geophysical Observatory at Mengcheng University of Science and Technology of ChinaAuhuiChina

Staining algorithms based on two-way wave equation migration methods have been applied to improve the signal-to-noise ratio(SNR)of poorly illuminated structures such as those in subsalt *** regular staining algorithms,when a source wavefield reaches the stained area that is associated with the target structures,a new wavefield called stained wavefield is excited,and this stained wavefield forward extrapolates synchronously with the real source *** forward-extrapolated stained and real source wavefields are cross-correlated with the backward-extrapolated receiver wavefield,and we obtain the stained and the real reverse time migration(RTM)*** staining algorithms for RTM can suppress the noise of non-target regions and obtain high SNR images of the target *** RTM methods are limited by the low computational efficiency and SNR,by contrast,one-way wave equation migration(OWEM)methods have the advantages of high efficiency and no interference from ***,we developed a new staining method based on the generalised screen propagator(GSP)as a case of OWEM methods for subsalt ***,a new stained wavefield called stained receiver wavefield is proposed here,forming two new staining strategies for seismic imaging,in which forward-propagated source and backward-propagated receiver wavefields can be conveniently selected to be stained at the stained *** experiments demonstrated that this staining GSP method is more effective in improving the SNR of subsalt structures compared to conventional GSP migration and RTM methods;moreover,these new staining strategies as applied to the OWEM methods can greatly improve the SNR of weakly illuminated structures in subsalt zones,in comparison with regular staining algorithms for one-way methods.

关键词： One-way two-way modelling imaging staining RTM

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Constructing confidence intervals of extreme rainfall quantiles using Bayesian,bootstrap,and profile likelihood approaches

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Science China(Technological Sciences) 2016年第4期59卷 573-585页

作者： CHEN Si li yaxing SHIN JiYae KIM TaeWoong department of civil and environmental engineering hanyang universitySeoul 133-791Korea department of electronics&communication engineering hanyang universityAnsan 426-791Korea department of civil and environmental engineering hanyang universityAnsan 426-791Korea

Hydrological risk is highly dependent on the occurrence of extreme *** fact has led to a wide range of studies on the estimation and uncertainty analysis of the *** most cases,confidence intervals(CIs)are constructed to represent the uncertainty of the *** the accuracy of CIs depends on the asymptotic normality of the data and is questionable with limited observations in practice,a Bayesian highest posterior density(HPD)interval,bootstrap percentile interval,and profile likelihood(PL)interval have been introduced to analyze the uncertainty that does not depend on the normality ***,comparison studies to investigate their performances in terms of the accuracy and uncertainty of the estimates are *** addition,the strengths,weakness,and conditions necessary for performing each method also must be ***,in this study,test experiments with simulations from varying parent distributions and different sample sizes were ***,applications to the annual maximum rainfall(AMR)time series data in South Korea were *** districts with 38-year(1973–2010)AMR observations were fitted by the three aforementioned methods in the *** both the experimental and application results,the Bayesian method is found to provide the lowest uncertainty of the design level while the PL estimates generally have the highest accuracy but also the largest *** bootstrap estimates are usually inferior to the other two methods,but can perform adequately when the distribution model is not heavy-tailed and the sample size is *** distribution tail behavior and the sample size are clearly found to affect the estimation accuracy and *** study presents a comparative result,which can help researchers make decisions in the context of assessing extreme rainfall uncertainties.

关键词： Bayesian bootstrap profile likelihood confidence interval frequency analysis

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PP2A interacts with KATANIN to promote microtubule organization and conical cell morphogenesis

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Journal of Integrative Plant Biology 2022年第8期64卷 1514-1530页

作者： Huibo Ren Jinqiu Rao Min Tang yaxing li Xie Dang Deshu lin Basic Forestry and Proteomic Research Center Fujian Provincial Key Laboratory of Plant Functional BiologyKey Laboratory of Ministry of Education for GeneticsBreeding and Multiple Utilization of CropsFujian Agriculture and Forestry UniversityFuzhou 350002China Haixia Institute of Sciences and Technology Fujian Agriculture and Forestry UniversityFuzhou 350002China

The organization of the microtubule cytoskeleton is critical for cell and organ *** evolutionarily conserved microtubule-severing enzyme KATANIN plays critical roles in microtubule organization in the plant and animal *** previously used conical cell of Arabidopsis thaliana petals as a model system to investigate cortical microtubule organization and cell morphogenesis and determined that KATANIN promotes the formation of circumferential cortical microtubule arrays in conical ***,we demonstrate that the conserved protein phosphatase PP2A interacts with and dephosphorylates KATANIN to promote the formation of circumferential cortical microtubule arrays in conical *** undergoes cycles of phosphorylation and *** co-immunoprecipitation coupled with mass spectrometry,we identified PP2A subunits as KATANIN-interacting *** biochemical studies showed that PP2 A interacts with and dephosphorylates KATANIN to stabilize its cellular *** to the katanin mutant,mutants for genes encoding PP2A subunits showed disordered cortical microtubule arrays and defective conical cell *** together,these findings identify PP2A as a regulator of conical cell shape and suggest that PP2A mediates KATANIN phospho-regulation during plant cell morphogenesis.

关键词： conical cells cortical microtubules KATANIN morphogenesis phospho-regulation protein phosphatase PP2A

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Blue light-induced phosphorylation of Arabidopsis cryptochrome 1 is essential for its photosensitivity

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Journal of Integrative Plant Biology 2022年第9期64卷 1724-1738页

作者： lin Gao Qing liu Ming Zhong Nannan Zeng Weixian Deng yaxing li Dong Wang Siyuan liu Qin Wang College of life Sciences Basic Forestry and Proteomics Research CenterFujian Agriculture and Forestry UniversityFuzhou350002 China School of life Sciences State Key Laboratory for Conservation and Utilization of Subtropical Agro-BioresourcesSouth China Agricultural UniversityGuangzhou510642 China Key Laboratory of Ministry of Education for Genetics Breeding and Multiple Utilization of CropsCollege of AgricultureFujian Agriculture and Forestry UniversityFuzhou350002 China Department of Biological Chemistry David Geffen School of MedicineUniversity of California Los AngelesLos AngelesCA90095 USA

Plants possess two cryptochrome photoreceptors,cryptochrome 1(CRY1)and cryptochrome 2(CRY2),that mediate overlapping and distinct physiological *** CRY1 and CRY2 undergo blue light-induced phosphorylation,but the molecular details of CRY1 phosphorylation remain *** we identify 19 in vivo phosphorylation sites in CRY1 using mass spectrometry and systematically analyze the physiological and photobiochemical activities of CRY1 variants with phosphosite *** demonstrate that nonphosphorylatable CRY1 variants have impaired phosphorylation,degradation,and physiological functions,whereasphosphomimeticvariants mimic the physiological functions of phosphorylated CRY1 to constitutively inhibit hypocotyl *** further demonstrate that phosphomimetic CRY1 variants exhibit enhanced interaction with the E3 ubiquitin ligase COP1(CONSTITUTIVELY PHOTOMORPHOGENIC 1).This finding is consistent with the hypothesis that phosphorylation of CRY1 is required for COP1-dependent signaling and regulation of *** also determine that PHOTOREGULATORY PROTEIN KINASEs(PPKs)phosphorylate CRY1 in a blue light-dependent manner and that this phosphorylation is critical for CRY1 signaling and *** results indicate that,similar to CRY2,blue light-dependent phosphorylation of CRY1 determines its photosensitivity.

关键词： Arabidopsis blue light cryptochrome phosphorylation PPK

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Emerging trends in the selective production of value-added aromatics

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Science China Chemistry 2024年

作者： Yuchao Wu Houliang Dai Weisheng Yang yaxing li lichen liu Petrochemical Research Institute Company limited China National Petroleum Corporation Engineering Research Center of Advanced Rare Earth Materials Department of Chemistry Tsinghua University

1 Introduction Aromatics （mainly benzene, toluene, and xylenes, BTX） are essential intermediates in the chemical industry. They are employed in the synthesis of a broad spectrum of chemicals and materials, e.g., various polymers, plastics, resins, solvents, dyes, pharmaceuticals[1]. The manufacturing pathway of BTX mainly includes petroleum reforming of naphtha, coal-to-aromatics, methanol-to-aromatics[2].

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踝关节炎:保踝手术与踝关节置换术

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中国修复重建外科杂志 2023年第7期37卷 769-775页

作者：李亚星张晖四川大学华西医院骨科骨科研究所成都610041

据统计踝关节炎患者约占全世界成年人口的1%,是严重的全球疾病负担。然而与髋、膝关节炎相比,临床对于踝关节炎的认识及治疗仍处于起步阶段。对于终末期踝关节炎,既往认为踝关节融合术是治疗“金标准”,但融合术后患者关节活动度丧失,... 详细信息

据统计踝关节炎患者约占全世界成年人口的1%,是严重的全球疾病负担。然而与髋、膝关节炎相比,临床对于踝关节炎的认识及治疗仍处于起步阶段。对于终末期踝关节炎,既往认为踝关节融合术是治疗“金标准”,但融合术后患者关节活动度丧失,步态改变、日常活动受限、邻近关节加速退变。因此,如何在缓解疼痛的同时保留踝关节活动度是治疗关键。目前,踝关节炎手术方式主要包括关节镜下关节清理术、关节周围截骨术、骨软骨移植术、踝关节牵张成形术,以及踝关节融合术、全踝关节置换术等。术者应基于患者症状、体征、影像学表现、需求、经济情况等因素综合考虑,选择个性化治疗方案。但目前尚无相关指南给出明确治疗建议,因此有必要对踝关节炎的诊治进行广泛而深入的探讨。

关键词：踝关节炎保踝手术踝关节置换术

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分数阶拉盖尔高斯光束轨道角动量的实验研究

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激光与光电子学进展 2015年第8期52卷 82-88页

作者：柯熙政李亚星西安理工大学自动化与信息工程学院陕西西安710048

携带轨道角动量(OAM)的分数阶涡旋光束是一种特殊螺旋结构的光束。利用空间光调制器加载传输方向与z轴夹角α干涉光栅,制备出了分数阶涡旋光束;利用水平与垂直叠加光栅,制备出具有不同拓扑荷数的光斑阵列。通过对比多组叠加实验图样,分... 详细信息

携带轨道角动量(OAM)的分数阶涡旋光束是一种特殊螺旋结构的光束。利用空间光调制器加载传输方向与z轴夹角α干涉光栅,制备出了分数阶涡旋光束;利用水平与垂直叠加光栅,制备出具有不同拓扑荷数的光斑阵列。通过对比多组叠加实验图样,分析了不同拓扑荷数叠加涡旋光束轨道角动量序列的规律,发现分数阶涡旋光束作为载体加载信息时,较整数阶涡旋光束有更强的光强分布,其中不同分数阶涡旋光束阵列的轨道角动量序列传递信息效率较高,有利于信息的传输,为涡旋光束在自由空间通信中的复用提供了实验依据。

关键词：衍射分数阶涡旋光束叉形全息光栅轨道角动量测量

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藏族青年婚照的影像表达初探

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西北民族研究 2020年第1期 154-163页

作者：李亚星格勒西南民族大学成都610225 中国藏学研究中心

婚照影像是视觉人类学研究的一个重要对象,它用影像技术记录下来的不仅是客观的社会现实,也是步入婚姻的男女对当下生活的感受、对未来生活的憧憬。在现代化和全球化的背景下,藏族青年的婚照叙事表明:对传统文化深深的敬意和眷恋与对现... 详细信息

婚照影像是视觉人类学研究的一个重要对象,它用影像技术记录下来的不仅是客观的社会现实,也是步入婚姻的男女对当下生活的感受、对未来生活的憧憬。在现代化和全球化的背景下,藏族青年的婚照叙事表明:对传统文化深深的敬意和眷恋与对现代文化的认可和接纳并不矛盾,婚照作为特殊的社会图像,用选择性出现的符号意义,形成新的文化表述。在人生的重要仪式中,婚照成为族群的静态记忆场。这种重要的家庭影像传承传统文化,重构新时代的集体记忆,表达着对多元文化交融共生的理解。

关键词：记忆场现代文化传统文化藏族青年婚照

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毛泽东对运用政治协商建立新中国的历史性贡献

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马克思主义研究 2020年第2期 111-119,164页

作者：李雅兴伍安湘潭大学毛泽东思想研究中心湖南湘潭411105 湘潭大学马克思主义学院湖南湘潭411105

中国共产党基于自身的革命性、先进性和代表性、整合性,能够整合中国社会各阶层、各党派、各人民团体的力量,担负起中国现代国家建设的使命,经过多方参与、深入协商而建立了中华人民共和国。毛泽东为协商建立新中国作出了重要贡献,主要... 详细信息

中国共产党基于自身的革命性、先进性和代表性、整合性,能够整合中国社会各阶层、各党派、各人民团体的力量,担负起中国现代国家建设的使命,经过多方参与、深入协商而建立了中华人民共和国。毛泽东为协商建立新中国作出了重要贡献,主要表现在:先后发表《新民主主义论》《论联合政府》《论人民民主专政》等系列文献,从理论上阐述“民主共和国”和“民主联合政府”思想;修改“五一口号”,郑重提出召开政治协商会议、成立民主联合政府的政治主张,绘制新中国政权蓝图;推动政治北上,从思想上消除党外人士疑虑;成立筹委会、修改《共同纲领(草案)》等重要文件;主持召开中国人民政治协商会议,建立中国新型政党制度,完成协商建立新中国的历史使命。

关键词：毛泽东新中国政治协商

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