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Multiple-Object Tracking Using Histogram Stamp Extraction in CCTV Environments

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Computers, Materials & Continua 2023年第12期77卷 3619-3635页

作者： Ye-Yeon kang Geon Park Hyun Yoo Kyungyong Chung Division of AI Computer Science and Engineering Kyonggi UniversitySuwon16227Korea Contents Convergence Software Research Institute Kyonggi UniversitySuwon16227Korea

Object tracking,an important technology in the field of image processing and computer vision,is used to continuously track a specific object or person in an *** technology may be effective in identifying the same person within one image,but it has limitations in handling multiple images owing to the difficulty in identifying whether the object appearing in other images is the *** tracking the same object using two or more images,there must be a way to determine that objects existing in different images are the same ***,this paper attempts to determine the same object present in different images using color information among the unique information of the ***,this study proposes a multiple-object-tracking method using histogram stamp extraction in closed-circuit television *** proposed method determines the presence or absence of a target object in an image by comparing the similarity between the image containing the target object and other *** this end,a unique color value of the target object is extracted based on its color distribution in the image using three methods:mean,mode,and interquartile *** Top-N accuracy method is used to analyze the accuracy of each method,and the results show that the mean method had an accuracy of 93.5%(Top-2).Furthermore,the positive prediction value experimental results show that the accuracy of the mean method was 65.7%.As a result of the analysis,it is possible to detect and track the same object present in different images using the unique color of the *** the results,it is possible to track the same object that can minimize manpower without using personal information when detecting objects in different *** the last response speed experiment,it was shown that when the mean was used,the color extraction of the object was possible in real time with 0.016954 *** this,it is possible to detect and track the same object in real time when using the proposed

关键词： Data mining deep learning object detection object tracking real-time object detection multiple object image processing

Influential factors of spatial performance in metro-led urban underground public space:A case study in Shanghai

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Underground Space 2023年第1期8卷 229-251页

作者： Chen-Xiao Ma Fang-Le Peng Yong-kang Qiao Hu Li Research Center for Underground Space&Department of Geotechnical Engineering Tongji UniversityShanghai 200092PR China Ji’nan Rail Transit Group Co. Ltd.Ji’nan 250014Shandong ProvincePR China

Spatial performance measures the space usage of each underground segment in metro-led urban underground public space(UUPS).It usually varies in different UUPS segments and at different *** environmental factors and space attractors can influence spatial performance in UUPS including spatial configurations,transportation facilities,space design characteristics,and commercial and work-ing *** study intends to figure out the temporal and spatial distribution patterns of spatial performance in UUPS and then reveal the main influential factors and their impact *** UUPS in Jiangwan–wujiaochang Sub-center was selected as the study *** counting methods and multiple regression models were employed to collect the pedestrian data and quantitatively analyze the correlations between pedestrian flows and candidate influential *** study verified that spatial configurations were the most important factors instead of underground or surface *** existed an interactive effect among pedestrian move-ments,spatial configurations,and commerce distribution in metro-led *** width and the distribution of metro stations could partly affect spatial *** influential mechanisms of metro stations were different on weekdays and at *** segments belonging to shopping malls in UUPS had a negative impact on spatial performance only on *** of this study can provide insights for more efficient layout planning and design of metro-led UUPS in Chinese metropolitan cities.

关键词： Urban underground public space Metro-led area Spatial performance Cordon count Multiple regression method

小学高年段学生的人工智能学习观念研究——基于图画的认知网络分析

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现代教育技术 2024年第8期34卷 90-100页

作者：高晗蕊张屹王康王莹赵苏楠从相淼华中师范大学人工智能教育学部湖北武汉430079 武汉市教育科学研究院湖北武汉430070 华中师范大学附属小学湖北武汉430079

随着人工智能基础教育的持续推进,小学高年段学生对人工智能学习萌发了更多的思考,但当前对小学高年段学生的人工智能学习观念及其与计算思维关系的研究仍不充分。因此,文章收集了285名五年级学生的现实和理想中人工智能学习的图画,采... 详细信息

随着人工智能基础教育的持续推进,小学高年段学生对人工智能学习萌发了更多的思考,但当前对小学高年段学生的人工智能学习观念及其与计算思维关系的研究仍不充分。因此,文章收集了285名五年级学生的现实和理想中人工智能学习的图画,采用基于图画的认知网络分析方法,将学生的图画编码为6个维度19个元素,并可视化学生的人工智能学习观念元素之间的关系结构。研究发现,小学高年段学生的人工智能学习观念现实状态偏重编程实践;小学高年段学生的人工智能学习观念理想状态偏重智能技术的体验与应用;计算思维高分组学生关注学习活动,低分组学生关注学习材料,期待参与学习活动。文章通过呈现小学高年段学生对现有人工智能学习的感知与理解,以及对未来人工智能学习的期待,旨在为推动小学人工智能教育的改革与创新提供参考。

关键词：小学高年段人工智能学习观念计算思维认知网络分析图画分析

Laser-based directed energy deposition of novel Sc/Zr-modified Al-Mg alloys:columnar-to-equiaxed transition and aging hardening behavior

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Journal of Materials Science & Technology 2021年第10期69卷 168-179页

作者： Zihong Wang Xin lin Yao Tang Nan kang Xuehao Gao Shuoqing Shi Weidong Huang State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi'an 710072China

The control of grain morphology is important in laser additive manufacturing(LAM),as grain morphology further affects the hot cracking resistance,anisotropy,and strength–ductility synergy of *** develop a solidification-control solution and achieve columnar-to-equiaxed transition(CET)in Al-based alloys during LAM,Sc-and-Zr-modified Al-Mg alloys were processed via directed energy deposition(DED).CET was achieved by introducing high potent primary Al_(3)(Sc,Zr)nucleation sites ahead of the solidification ***,the relationship between the solidification control parameters and precipitation behavior of primary Al_(3)(Sc,Zr)nucleation sites was established using the time-dependent nucleation ***,the CET was studied according to the Hunt *** results indicated that coarse columnar grain structure was still obtained at the inner region of the molten pool at low Sc/Zr contents owing to the effective suppression of the precipitation of the primary Al_(3)(Sc,Zr)nucleation sites via rapid solidification during *** addition,the relatively low melt temperature at the fusion boundary unavoidably promoted the precipitation of primary Al_(3)(Sc,Zr)nucleation sites,which resulted in a fine equiaxed grains band at the edge of the molten *** the Sc/Zr content increased,the solidification cooling rate was not sufficient to suppress the precipitation of the primary Al_(3)(Sc,Zr)nucleation sites,and a fully equiaxed grain structure was ***,the effect of the layer-by-layer manufacturing process on the subsequent precipitation strengthening of secondary Al_(3)(Sc,Zr)precipitates was *** the remelting and subsequent aging during thermal cycling should be considered to achieve greater precipitation strengthening.

关键词： Al-Mg-Sc-Zr alloys Additive manufacturing Directed energy deposition Columnar-to-equiaxed transition Phase precipitation

Confidence intervals for Markov chain transition probabilities based on next generation sequencing reads data

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Quantitative Biology 2020年第2期8卷 143-154页

作者： lin Wan Xin kang Jie Ren Fengzhu Sun NCMIS LSCAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences Fudan UniversityShanghai 200433China Quantitative and Computational Biology Program University of Southern CaliforniaLos AngelesCA 90089USA

Background:Markov chains(MC)have been widely used to model molecular *** estimations of MC transition matrix and confidence intervals of the transition probabilities from long sequence data have been intensively studied in the past *** next generation sequencing(NGS),a large amount of short reads are *** short reads can overlap and some regions of the genome may not be sequenced resulting in a new type of *** on NGS data,the transition probabilities of MC can be estimated by moment ***,the classical asymptotic distribution theory for MC transition probability estimators based on long sequences is no longer ***:In this study,we present the asymptotic distributions of several statistics related to MC based on NGS *** show that,after scaling by the effective coverage d defined in a previous study by the authors,these statistics based on NGS data approximate to the same distributions as the corresponding statistics for long ***:We apply the asymptotic properties of these statistics for finding the theoretical confidence regions for MC transition probabilities based on NGS short reads *** validate our theoretical confidence intervals using both simulated data and real data sets,and compare the results with those by the parametric bootstrap ***:We find that the asymptotic distributions of these statistics and the theoretical confidence intervals of transition probabilities based on NGS data given in this study are highly accurate,providing a powerful tool for NGS data analysis.

关键词： Markov chains next generation sequencing transition probabilities confidence intervals

Typical Microstructural Characteristics of Ti–5Al–5Mo–5V–3Cr–1Fe Metastable β Ti Alloy Forged in α + β Region

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Acta Metallurgica Sinica(English Letters) 2020年第12期33卷 1601-1608页

作者： Zhiying Zheng linjiang Chai kang Xiang Weijiu Huang Yongfeng Wang Liangliang Liu lin Tian College of Materials Science and Engineering Chongqing University of TechnologyChongqing 400054China College of Materials Science and Engineering Chongqing University of Arts and SciencesChongqing 402160China Chongqing Kingsley Aeronautical Material Technology Co.Ltd Chongqing 404100China

In this study,typical microstructural characteristics of a metastableβTi alloy(Ti–5Al–5Mo–5V–3Cr–1Fe)forged in a dual-phase region(strain of 54%at 820℃)were investigated in detail by the combined use of X-ray diff raction,energy dispersive spectroscopy,electron channeling contrast imaging and electron backscatter diff raction *** show that the microstructure of the forged alloy is composed of bulkαgrains,αplates andβ*** bulkαgrains correspond to retained primaryαphase(αp,average grain size^2.4μm),while theαplates are secondaryαphase(αs,width^70 nm)precipitated from theβmatrix during air *** forging,theβmatrix experiences dynamic recovery with many subgrains and signifi cant orientation gradients *** of the orientation relationship between theαandβphases show that the Burgers orientation relationship is not maintained between someα_p andβphases,which should be related to thermal deformation-induced changes of their *** contrast,all of theαs plates are found to maintain well the Burgers orientation relationship with theβphase.

关键词： Metastableβ Ti alloy α+βforging Dynamic recovery Orientation relationship Electron backscatter diffraction(EBSD)

Earthquake Risk Assessment Approach Using Multiple Spatial Parameters for Shelter Demands

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Computers, Materials & Continua 2022年第2期70卷 3763-3780页

作者： Wenquan Jin Naeem Iqbal Hee-Cheal kang Dohyeun Kim Big Data Research Center Jeju National UniversityJeju63243Korea Department of Computer Engineering Jeju National UniversityJeju63243Korea Infomind Jeju63243Korea

The earthquake is considered one of the most devastating disasters in any area of the world due to its potentially destructive *** on the various earthquake-related parameters,the risk assessment is enabled in advance to prevent future earthquake *** this paper,for providing the shelter space demands to reduce the damage level and prevention costs,an earthquake risk assessment approach is proposed for deriving the risk index based on multiple spatial parameters in the gridded *** proposed assessment approach is comprised of pre-processing,methodologymodel,and data *** risk index model derives the earthquake risk index by multiple spatial parameters including indexes of earthquake,danger,shelter,and building for blocks in the quantitative gridded *** parameters are provided based onmathematicalmodels and combinedwith the risk index that presents the earthquake risk assessment result for each ***,the gridding approach is proposed to provide the elements of the risk assessment area that are used in the spatial *** gridded map is developed for the selected area to visualize risk index parameters associated with each risk *** on the derived result of the proposed earthquake risk indexmodel,emergency shelter requirements are provided according to the risk index for each location,which supports safety measures in advance to prevent future earthquake disasters.

关键词： Risk analysis risk index earthquake shelter demand data analysis

Willy安全机器人设计,安心环境的守护者

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工业设计 2024年第6期 21-21页

作者： Yungwon kang 不详

在一个安全的社会里,人们会对犯罪感到不安。Willy是一个提供心理安全的机器人,它有时像一个友好的邻居,有时像一个温暖的家庭,有时像一个强大的警卫。

关键词：机器人机器人设计守护者

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便携式分压力质谱计校准装置的性能测试研究

真空科学与技术学报 2024年第4期44卷 306-311页

作者：姚雪琦董云宁闫睿陈俊儒丁双康朋伟卢耀文北京市真空计量检测工程技术研究中心北京100029 北京东方计量测试研究所北京100029

文章对新研制的便携式分压力质谱计校准装置的部分性能进行了测试。采用参考电离真空计测量了装置的极限真空度;对于流导值在10^(-2) m^(3)/s的圆孔型抽气流导元件,通过精确测量其直径和厚度的尺寸,采用公式计算得到分子流条件下的流导... 详细信息

文章对新研制的便携式分压力质谱计校准装置的部分性能进行了测试。采用参考电离真空计测量了装置的极限真空度;对于流导值在10^(-2) m^(3)/s的圆孔型抽气流导元件,通过精确测量其直径和厚度的尺寸,采用公式计算得到分子流条件下的流导值;对于孔径在微米量级的进气流导元件,采用定容衰减压力的方法通过实验测量确定其流导值;采用同一真空计分别测量抽气流导元件两端的气体压力获得返流比。测试研究结果表明:装置的极限真空度为4.8×10^(-7) Pa,抽气流导元件对N2的流导值为1.37×10^(-2) m^(3)/s,对N_(2)的返流比为0.193,两个进气流导元件对N_(2)的流导值分别为3.81×10^(-6) m^(3)/s、4.50×10^(-8) m^(3)/s,综合分析可得装置对N_(2)的校准范围为(4×10^(-1)~5×10^(-6))Pa。

关键词：校准装置分压力性能测试质谱计便携式

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