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改进YOLOv5的安全帽佩戴检测算法

计算机工程与应用 2023年第11期59卷 203-211页

作者：乔炎甄彤李智慧河南工业大学信息科学与工程学院郑州450001 粮食信息处理与控制重点实验室郑州450001

针对目前目标检测模型结构复杂、计算量大、检测准确率低等问题,提出在工业场景下基于改进型YOLOv5的安全帽佩戴算法。在主干网络引入轻量型网络ShuffleNetv2,保留Focus结构和ShuffleNetv2共同组成主干网络,降低网络的计算量和参数量;... 详细信息

针对目前目标检测模型结构复杂、计算量大、检测准确率低等问题,提出在工业场景下基于改进型YOLOv5的安全帽佩戴算法。在主干网络引入轻量型网络ShuffleNetv2,保留Focus结构和ShuffleNetv2共同组成主干网络,降低网络的计算量和参数量;在C3模块中引入Swin Transformer Block,得到C3STB模块,替换Neck部分原有的C3模块;设计了CBAM_H注意力机制,并将其嵌入Neck网络中,获取全局上下文信息,提高模型检测准确率。自建数据集并进行实验,实验结果表明,改进后的YOLOv5模型的参数量由6.14×10^(6)压缩到8.9×10^(5),计算量由1.64×10^(10)压缩到6.2×10^(9),mAP由0.899上升到0.908,优于原模型性能。

关键词： YOLOv5 ShuffleNetv2 CBAM注意力机制 Swin Transformer Block

Evaluation of Auto-Ignition Characteristics of Diesel Surrogate Fuels with the Same Derived Cetane Numbers at Changed Thermodynamic Environments

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Journal of Thermal Science 2024年第4期33卷 1590-1606页

作者： ZHANG Cong GUAN Yuanhang HUANG zhen HAN Dong Key Laboratory for Power Machinery and Engineering Ministry of EducationShanghai Jiao Tong UniversityShanghai200240China College of Smart Energy Shanghai Jiao Tong UniversityShanghai200240China Shanghai Non-carbon Energy Conversion and Utilization Institute Shanghai200240China

The ignition tendency of diesel fuels is highly sensitive to ambient conditions and fuel *** this study,the ignition characteristics of different diesel surrogate fuels with the same derived cetane numbers(DCN)were measured and compared in varied thermodynamic and oxidizing *** combustion pressures,heat release rates,ignition delays,and combustion delays of the test fuels were *** experimental results showed that the diesel surrogate fuels with the same DCNs exhibit similar ignition propensity at standard DCN test ***,for the test conditions of high cetane fuels,high ambient temperatures,and suficient oxygen concentrations,surrogate fuels with the same DCN have similar ignition behaviors,and using the DCN to evaluate fuel ignition tendency is ***,for the test conditions of low cetane fuels,low ambient temperatures,and reduced oxygen concentrations,different ignition behaviors are observed for the surrogate fuels with the same DCN,so at these conditions using DCN as the evaluation index for fuel ignition tendency may lead to higher uncertainty.

关键词： diesel fuels surrogate fuels derived cetane numbers constant volume combustion chamber

Theoretical and experimental investigation of chemical mechanical polishing of W–Ni–Fe alloy

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International Journal of Extreme Manufacturing 2021年第2期3卷 125-137页

作者： Jiang Guo Xiaolin Shi Chuanping Song Lin Niu Hailong Cui Xiaoguang Guo zhen tong Nan Yu Zhuji Jin Renke Kang Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalianPeople’s Republic of China EPSRC Hub in Future Metrology Centre for Precision TechnologiesUniversity of HuddersfieldHuddersfieldUnited Kingdom Institute for Materials and Processes School of EngineeringSanderson BuildingUniversity of EdinburghEH93FB ScotlandUnited Kingdom

Fine finishing of tungsten alloy is required to improve the surface quality of molds and precision instruments. Nevertheless, it is difficult to obtain high-quality surfaces as a result of grain boundary steps attributed to differences in properties of two-phase microstructures. This paper presents a theoretical and experimental investigation on chemical mechanical polishing of W–Ni–Fe alloy. The mechanism of the boundary step generation is illustrated and a model of grain boundary step formation is proposed. The mechanism reveals the effects of mechanical and chemical actions in both surface roughness and material removal. The model was verified by the experiments and the results show that appropriately balancing the mechanical and chemical effects restrains the generation of boundary steps and leads to a fine surface quality with a high removal rate by citric acid-based slurry.

关键词： chemical mechanical polishing W–Ni–Fe alloy grain boundary step modelling mechanism

High-resolution observations of prominence plume formation with the new vacuum solar telescope

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Research in Astronomy and Astrophysics 2021年第9期21卷 91-100页

作者：薛建朝 Jean-Claude Vial Yang Su Hui Li Zhi Xu Ying-Na Su Tuan-Hui Zhou zhen-tong Li Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China Institut d'strophysique Spatiale CNRS/UniversitéParis-SudUniversitéParis-SaclayBâtiment 12191405 Orsay CedexFrance Yunnan Observatories Chinese Academy of SciencesKunming 650216China

Prominence plumes are evacuated upflows that emerge from bubbles below prominences,whose formation mechanism is still *** we present a detailed study of plumes in a quiescent prominence using the high-resolution Hαfiltergrams at the line center as well as line wing at±0.4 A from the New Vacuum Solar *** of brightening,blue shifts,and turbulence at the fronts of plumes are found during their *** large plumes split at their heads and finger-shaped structures are formed between ***-shifted flows along the bubble-prominence interface are found before and during the plume *** observations are consistent with the hypothesis that prominence plumes are related to coupled Kelvin-Helmholtz and Rayleigh-Taylor(KH/RT)*** splittings and fingers are evidence of RT instability,and the flows may increase the growth rate of KH/RT ***,the significant turbulence at plume fronts may suggest that the RT instability is triggered by the plumes penetrating into the *** this scenario,extra mechanisms are necessary to drive the plumes.

关键词： instabilities methods:data analysis Sun:filaments,prominences

固相纳米孔对核酸组装的“免标记、均相”表征和应用探索

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高分子学报 2022年第1期53卷 4-14页

作者：祝振童吴瑞萍李冰凌中国科学院长春应用化学研究所电分析化学国家重点实验室长春130022

随着核酸自组装领域的飞速发展,除了作为遗传信息的载体外,核酸成为了一种具有高操作自由度和无限可能性的功能材料.基于核酸自组装原理的DNA纳米技术凭借其强大的可编辑性已经广泛应用于生物传感、纳米材料工程、医学诊疗以及分子计算... 详细信息

随着核酸自组装领域的飞速发展,除了作为遗传信息的载体外,核酸成为了一种具有高操作自由度和无限可能性的功能材料.基于核酸自组装原理的DNA纳米技术凭借其强大的可编辑性已经广泛应用于生物传感、纳米材料工程、医学诊疗以及分子计算机等领域.纳米孔作为一种新兴的单分子分析技术具有高分辨、高通量、免标记等特点,近年来在基因测序、分子物理化学性质分析等领域展示出了极大的应用潜力.作为一种新型高分辨表征技术,纳米孔已经在DNA纳米技术研究中崭露头角,被用于原位追踪和分析核酸分子的自组装行为.另一方面,DNA纳米技术也为纳米孔传感所面临的技术瓶颈提供了更多样化的解决思路,如借助功能核酸(Aptamer或DNAzyme)和无酶扩增核酸分子线路实现纳米孔对待测物的特异性增敏检测.本专论旨在通过对近期纳米孔技术与核酸自组装的跨领域研究成果进行系统性回顾,总结并展望纳米孔传感领域内核酸自组装的研究进展,以期为单分子生物分析、信息检索、基因分型和临床诊断等领域提供新思路和新方法.

关键词：固相纳米孔核酸纳米结构核酸分子线路免标记表征

Microbiome and metabolome dysbiosis analysis in impaired glucose tolerance for the prediction of progression to diabetes mellitus

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Journal of Genetics and Genomics 2024年第1期51卷 75-86页

作者： Boxun Zhang Xuan Zhang zhen Luo Jixiang Ren Xiaotong Yu Haiyan Zhao Yitian Wang Wenhui Zhang Weiwei Tian Xiuxiu Wei Qiyou Ding Haoyu Yang Zishan Jin Xiaolin tong Jun Wang Linhua Zhao Institute of Metabolic Diseases Guang'anmen HospitalChina Academy of Chinese Medical SciencesBeijing 100053China Faculty of Biological Science and Technology Baotou Teacher's CollegeBaotouInner Mongolia 014030China CAS Key Laboratory of Pathogenic Microbiology and Immunology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China Infinitus(China)Company Ltd GuangzhouGuangdong 510405China Affiliated Hospital of Changchun University of Chinese Medicine ChangchunJilin 130021China Department of Endocrinology Guang'anmen HospitalChina Academy of Chinese Medical SciencesBeijing 100053China Xinjiekou Community Health Service Center in Xicheng District Beijing 100035China Department of Spleen and Stomach Shenzhen Traditional Chinese Medicine HospitalShenzhenGuangdong 518033China University of Chinese Academy of Sciences Beijing 100049China Beijing University of Chinese Medicine Beijing 100105China Northeast Asia Institute of Traditional Chinese Medicine Changchun University of Chinese MedicineChangchunJilin 130117China

Gut microbiota and circulating metabolite dysbiosis predate important pathological changes in glucose metabolic disorders;however,comprehensive studies on impaired glucose tolerance(IGT),a diabetes mellitus(DM)precursor,are ***,we perform metagenomic sequencing and metabolomics on 47 pairs of individuals with IGT and newly diagnosed DM and 46 controls with normal glucose tolerance(NGT);patients with IGT are followed up after 4 years for progression to *** of baseline data reveals significant differences in gut microbiota and serum metabolites among the IGT,DM,and NGT *** addition,13 types of gut microbiota and 17 types of circulating metabolites showed significant differences at baseline before IGT progressed to DM,including higher levels of Eggerthella unclassified,Coprobacillus unclassified,Clostridium ramosum,L-valine,L-norleucine,and L-isoleucine,and lower levels of Eubacterium eligens,Bacteroides faecis,Lachnospiraceae bacterium 3_1_46FAA,Alistipes senegalensis,Megaspaera elsdenii,Clostridium perfringens,α-linolenic acid,10E,12Z-octadecadienoic acid,and dodecanoic acid.A random forest model based on differential intestinal microbiota and circulating metabolites can predict the progression from IGT to DM(AUC=0.87).These results suggest that microbiome and metabolome dysbiosis occur in individuals with IGT and have important predictive values and potential for intervention in preventing IGT from progressing to DM.

关键词： Impaired glucose tolerance Diabetes mellitus Gut microbiota Metabolomics

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低光照图像增强研究方法综述

计算机工程与应用 2023年第18期59卷 14-27页

作者：彭大鑫甄彤李智慧河南工业大学粮食信息处理与控制教育部重点实验室郑州450001 河南工业大学信息科学与工程学院郑州450001

低光照图像增强目的是从低光照条件下恢复细节完整的图像,并逐渐成为计算机图像处理研究的热点。图像成像的质量对于智能安防、视频监控等场景至关重要,且在相关行业中有着十分广阔的应用前景。为了深入研究低光照图像增强,对传统低光... 详细信息

低光照图像增强目的是从低光照条件下恢复细节完整的图像,并逐渐成为计算机图像处理研究的热点。图像成像的质量对于智能安防、视频监控等场景至关重要,且在相关行业中有着十分广阔的应用前景。为了深入研究低光照图像增强,对传统低光照图像增强方法进行详细地分类阐述与分析,列举了基于深度学习的图像增强方法,对所用到的各种网络以及所解决的问题进行了详细的梳理,并将所提到的方法进行了细致的对比。又对数据集进行了细致的分析和研究,并对一些常用的评价指标进行了简单梳理。对所述内容做出总结以及指出了当前研究中存在的困难,并指出了未来的研究目标。

关键词：低光照图像增强深度学习 Retinex理论低光照图像数据集图像处理

Development of a droplet digital polymerase chain reaction assay for the sensitive detection of total and integrated HIV-1 DNA

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Chinese Medical Journal 2024年第6期137卷 729-736页

作者： Lin Yuan Zhiying Liu Xin Zhang Feili Wei Shan Guo Na Guo Lifeng Liu zhenglai Ma Yunxia Ji Rui Wang Xiaofan Lu zhen Li Wei Xia Hao Wu tong Zhang Bin Su Beijing Key Laboratory for HIV/AIDS Research Clinical and Research Center for Infectious DiseasesBeijing Youan HospitalCapital Medical UniversityBeijing 100069China Beijing Institute of Hepatology Beijing Youan HospitalCapital Medical UniversityBeijing 100069China

Background:Total human immunodeficiency virus(HIV)DNA and integrated HIV DNA are widely used markers of HIV *** digital polymerase chain reaction(ddPCR)can be used for absolute quantification without needing a standard ***,we developed duplex ddPCR assays to detect and quantify total HIV DNA and integrated HIV ***:The limit of detection,dynamic ranges,sensitivity,and reproducibility were evaluated by plasmid constructs containing both the HIV long terminal repeat(LTR)and human CD3 gene(for total HIV DNA)and ACH-2 cells(for integrated HIV DNA).Forty-two cases on stable suppressive antiretroviral therapy(ART)were assayed in total HIV DNA and integrated HIV *** coefficient analysis was performed on the data related to DNA copies and cluster of differentiation 4 positive(CD4^(+))T-cell counts,CD8^(+)T-cell counts and CD4/CD8 T-cell ratio,*** assay linear dynamic range and lower limit of detection(LLOD)were also ***:The assay could detect the presence of HIV-1 copies 100%at concentrations of 6.3 copies/reaction,and the estimated LLOD of the ddPCR assay was 4.4 HIV DNA copies/reaction(95%confidence intervals[CI]:3.6-6.5 copies/reaction)with linearity over a 5-log_(10)-unit range in total HIV DNA *** the integrated HIV DNA assay,the LLOD was 8.0 copies/reaction(95%CI:5.8-16.6 copies/reaction)with linearity over a 3-log 10-unit *** HIV DNA in CD4^(+)T cells was positively associated with integrated HIV DNA(r=0.76,P<0.0001).Meanwhile,both total HIV DNA and integrated HIV DNA in CD4^(+)T cells were inversely correlated with the ratio of CD4/CD8 but positively correlated with the CD8^(+)T-cell ***:This ddPCR assay can quantify total HIV DNA and integrated HIV DNA efficiently with robustness and *** can be readily adapted for measuring HIV DNA with non-B clades,and it could be beneficial for testing in clinical trials.

关键词： Human immunodeficiency virus HIV Integrated HIV-1 DNA Total HIV DNA Droplet digital polymerase chain reaction HIV reservoir Antiretroviral therapy

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粘连颗粒图像的分割方法综述

中国粮油学报 2022年第3期37卷 186-194页

作者：高辉甄彤李智慧粮食信息处理与控制重点实验室河南工业大学信息科学与工程学院郑州450001

粘连图像分割作为颗粒计数、分类、定级评价、识别的基础环节,其实际应用价值不言而喻。本文简要介绍现有的传统分割算法和基于深度学习的分割算法种类,根据粘连颗粒尺寸小、随机散落、数量众多、形状不规则及边缘特征模糊等特点,结合... 详细信息

粘连图像分割作为颗粒计数、分类、定级评价、识别的基础环节,其实际应用价值不言而喻。本文简要介绍现有的传统分割算法和基于深度学习的分割算法种类,根据粘连颗粒尺寸小、随机散落、数量众多、形状不规则及边缘特征模糊等特点,结合粘连分割算法在各种领域中的应用现状,重点阐述基于分水岭、凹点、U-Net语义分割的方法,介绍关键技术,分析优缺点,明确适用范围,进行算法评价,并对相关的研究方向和发展趋势作出展望。

关键词：粘连分割分水岭凹点 U-Net语义分割