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基于空间注意力机制的行人再识别方法

北京航空航天大学学报 2020年第9期46卷 1747-1755页

作者：张子昊周千里王蓉中国人民公安大学警务信息工程与网络安全学院北京100038 安全防范技术与风险评估公安部重点实验室北京100038 北京市公安局北京100740

行人再识别是图像检索领域的一个重要部分,但是由于行人姿态各异、背景复杂等因素,导致提取到的行人特征鲁棒性和代表性不强,进而影响行人再识别的精度。在AlignedReID++算法基础上,提出了基于空间注意力机制的行人特征提取方法,应用在... 详细信息

行人再识别是图像检索领域的一个重要部分,但是由于行人姿态各异、背景复杂等因素,导致提取到的行人特征鲁棒性和代表性不强,进而影响行人再识别的精度。在AlignedReID++算法基础上,提出了基于空间注意力机制的行人特征提取方法,应用在行人再识别中取得了很好的效果。首先,在特征提取部分,引入空间注意力机制来增强特征表达,同时抑制可能的噪声;其次,通过在卷积层中引入实例正则化层(IN)来辅助批正则化层(BN)对特征进行归一化处理,解决单一BN层对特征色调变化以及光照变化的不敏感性,提高特征提取对亮度、色调变化的鲁棒性;最后,在Market1501、DukeMTMC和CUHK033个行人再识别通用数据集上对所提改进模型进行测试评价。实验结果显示:改进后的模型在3个数据集上识别精度分别提升了2%、2.9%和5.1%,表明改进后的模型相较于改进前的模型,在精度以及鲁棒性上都有显著提高。

关键词：深度学习空间注意力机制行人特征特征增强卷积神经网络

稀土氧化物稳定t-ZrO_(2)结构和电子性能的研究

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功能材料 2021年第11期52卷 11087-11093页

作者：刘千礼范舟王洋西南石油大学新能源与材料学院成都610500

t-ZrO_(2)是一种宽带隙半导体材料,在氧传感器、固体氧化物燃料电池和涂层材料被广泛应用,由于t-ZrO_(2)只能在高温下存在,常加入稀土氧化物稳定至室温。采用第一性原理计算了形成能、能带、态密度及电荷密度,研究了Y_(2)O_(3),Sc_(2)O_... 详细信息

t-ZrO_(2)是一种宽带隙半导体材料,在氧传感器、固体氧化物燃料电池和涂层材料被广泛应用,由于t-ZrO_(2)只能在高温下存在,常加入稀土氧化物稳定至室温。采用第一性原理计算了形成能、能带、态密度及电荷密度,研究了Y_(2)O_(3),Sc_(2)O_(3),La_(2)O_(3)等稀土氧化物掺杂无补偿和有空位补偿对t-ZrO_(2)的结构和电子性能的影响。结果表明,稀土氧化物与Vo共同相互作用是稳定的关键,Y11(Vo)-2NN(1),Sc13(Vo)-2NN(1),La11(Vo)-2NN(1)三聚体形成能最小,稳定效果最佳。通过能带结构和态密度,相比于理想t-ZrO_(2),由于容纳过剩电子,掺杂体系带隙均有所减小,掺杂无补偿结构在费米能级附近出现新能带。由于O-2p与Zr-4d电子态的作用,导带与价带的迁移增强了费米能级附近电子的相互作用,并改善了t-ZrO_(2)的电子性能。通过电子密度分布表征原子键合得出,稳定性本质在于原子间化学键合的作用。这为t-ZrO_(2)的应用提供了有效的理论依据。

关键词： t-ZrO_(2) 稀土氧化物氧空位结构稳定性电子性能

Use of serum Golgi protein 73 for screening chronic hepatitis B virus infection patients needing antiviral therapy in the community

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Chinese Medical Journal 2022年第22期135卷 2741-2743页

作者： Jinwei Duan Xiajie Wen Huai wang Weixin Chen Pei Gao qianli Yuan Han Zheng Yanna Liu Jiang Wu Jie wang Mingjie Yao Fengmin Lu Department of Epidemiology and Biostatistics College of Public HealthZhengzhou UniversityZhengzhouHenan 450001China Department of Microbiology and Infectious Disease Center School of Basic Medical SciencePeking University Health Science CenterBeijing 100191China Department of Immunization Beijing Centers for Disease Prevention and ControlBeijing Centers for Disease Preventive Medical ResearchBeijing 100013China Department of Anatomy and Embryology School of Basic Medical SciencesPeking University Health Science CenterBeijing 100191China

Chronic hepatitis B virus (HBV) infection is a major global public health problem. Approximately 887,000 people die of HBV infection-related diseases annually, with cirrhosis and hepatocellular carcinoma (HCC) being the principal causes of mortality.[1] Timely antiviral therapy greatly reduces the risks of cirrhosis and HCC. However, unfortunately, of those patients who are eligible for antiviral treatment, only 25% of patients in clinic settings and 12% of those in community settings obtain timely antiviral therapy.[2] Therefore, reliable means of identifying patients with chronic HBV infection that require antiviral therapy are necessary, particularly for use in the community.

关键词： patients infection mortality

Coverage of 13-Valent Pneumococcal Conjugate Vaccine Among Children 0–15 Months of Age—9 Provinces,China,2019–2021

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China CDC weekly 2023年第17期5卷 379-384页

作者： Lijun Liu Zhaonan Zhang Xixi Zhang Changsha Xu Yifan Song Li Li Jiakai Ye Zhiguo wang Hui Liang Weiyan Zhang Ling Lin Ning Li Shujun Zhang qianli Ma Wen Du Yongzhuo Jiao Lingsheng Cao Qi Qi Lei Cao Wenzhou Yu Sichuan Center for Disease Control and Prevention Chengdu CitySichuan ProvinceChina National Immunization Program Chinese Center for Disease Control and PreventionBeijingChina Suqian Center for Disease Control and Prevention Suqian CityJiangsu ProvinceChina Jiangsu Center for Disease Control and Prevention Nanjing CityJiangsu ProvinceChina Zhejiang Center for Disease Control and Prevention Hangzhou CityZhejiang ProvinceChina Shandong Center for Disease Control and Prevention Jinan CityShandong ProvinceChina Anhui Center for Disease Control and Prevention Hefei CityAnhui ProvinceChina Hubei Center for Disease Control and Prevention Wuhan CityHubei ProvinceChina Hunan Center for Disease Control and Prevention Changsha CityHunan ProvinceChina Guizhou Center for Disease Control and Prevention Guiyang CityGuizhou ProvinceChina Gansu Center for Disease Control and Prevention Lanzhou CityGansu ProvinceChina

Summary What is already known on this topic?Limited data exist regarding the coverage of the 13-valent pneumococcal conjugate vaccine(PCV13)in China.A lack of official statistics,coupled with an insufficient body of published literature,hinders the accurate depiction of the current *** is added by this report?This study investigated the utilization of PCV13 and estimated its coverage in nine provinces across eastern,central,and western China between 2019 and *** an annual increase in PCV13 usage during this period,the overall coverage remained suboptimal.

关键词： spite coverage hinder

Effect of Fertilizer Application on the Yield of Walnut (Juglans regia L.)

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Agricultural Biotechnology 2019年第2期8卷 142-145页

作者： Anmin MIN Fanrong ZHENG Li ZHANG Jianshe HE Changxu YANG qianli LIU Li wang Yu wang Hongxia LI Sichuan Academy of Forestry Science Nanjiang Forestry Science and Technology Co. Ltd. Aba Prefecture Institute of Forestry Science and Technology Environmental Protection and Forestry Bureau of Li County

[Objectives] This study was conducted to explore the fertilization ratio of walnut, so as to provide a basis for rational fertilization of walnut. [Methods] Under the condition of gravelly yellow soil in Chaotian District, Guangyuan City, the orthogonal design of L_9(3~4) was used to test the fertilization ratio of nitrogen, phosphorus and potassium fertilizers. [Results] The effects of nitrogen, phosphorus and potassium fertilizers on walnut yield ranked as phosphate fertilizer>potassium fertilizer>nitrogen fertilizer. The different treatments had great effects on the yield of walnut, and for the land with gravelly yellow soil, the suitable annual fertilization amount of walnut was urea 1 200 g/plant + calcium superphosphate 1 500 g/plant + potassium sulfate 940 g/plant. [Conclusions] This study provides a theoretical basis for rational fertilization of walnut in Sichuan Province.

关键词： Juglans regia L. Nitrogen Phosphorus Potassium Fertilizer Yield

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肽超分子自组装:结构调控和功能化

化学学报 2017年第10期75卷 933-942页

作者：王娟邹千里闫学海中国科学院过程工程研究所生化工程国家重点实验室北京100190

生物分子自组装对生物体有重要意义,利用生物分子构筑具有功能性的有序组装体一直是人们关注的焦点.肽分子是一类重要的组装基元,肽的超分子自组装可形成多种纳米或微米尺度的结构,并可应用于能源、医药等领域.如何实现肽自组装结构的... 详细信息

生物分子自组装对生物体有重要意义,利用生物分子构筑具有功能性的有序组装体一直是人们关注的焦点.肽分子是一类重要的组装基元,肽的超分子自组装可形成多种纳米或微米尺度的结构,并可应用于能源、医药等领域.如何实现肽自组装结构的精准调控以及精准调控肽自组装实现功能化,是目前该领域面临的新挑战.肽的自组装是基于非共价键力的协同作用实现的,通过各种因素调节这些非共价键力的作用,是实现自组装结构调控和功能化的关键.虽然自组装结构调控可以通过改变外部环境调控,但是通过精确分子设计、组装基元分子间的相互作用调控可以更好地实现结构的精准调控;并有利于进一步通过引入功能性分子作为组装基元,实现自组装体的功能化.本文将针对肽自组装体的结构调控以及功能化两个方面对相关研究进行综述.

关键词：肽分子自组装非共价键作用结构调控功能化

Measuring and comparing in-situ CO2 and CO profiles with satellite observations and model data

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Atmospheric and Oceanic Science Letters 2019年第6期12卷 444-450页

作者： YI You LIU Yi CAI Zhaonan FANG Shuangxi YANG Dongxu wang Yong LIANG Miao YAO Bo MA qianli wang Maohua Institute of Atmospheric Physics Chinese Academy of SciencesBeijingChina College of Earth and Planetary Science University of Chinese Academy of SciencesBeijingChina Shanghai Advanced Research Institute Chinese Academy of SciencesShanghaiChina Meteorological Observation Centre China Meteorological AdministrationBeijingChina Zhejiang Lin’an Regional Atmosphere Watch Station ZhejiangChina

Accurate measurements of the vertical distribution of carbon dioxide(CO2)in the atmosphere are critical to validate the vertical columns recorded by satellite and ground-based spectrometers and to estimate sources and sinks of *** work describes an in-situ air-sampler system(Aircore).Profiles of CO2 and carbon monoxide(CO)were retrieved from two soundings of this system in Xilin Hot on 13 and 14 June 2018,and compared with observations from the Tropospheric Monitoring Instrument(TROPOMI),Orbiting Carbon Observatory-2(OCO-2),and Copernicus Atmosphere Monitoring Service(CAMS).The column-averaged mixing ratio of CO(XCO)monitored by TROPOMI agreed well with that calculated from the in-situ CO pro le,with a small mean diffierence of 5±1.89 *** column-averaged mixing ratio of CO2(XCO2)monitored by OCO-2 also agreed well with that calculated from the in-situ CO2 profile,with a slight bias of 0.4±0.6 *** OCO-2 a posteriori profile had an obvious bias compared with the in-situ CO2 pro le on 13 June,with an underestimation between 600 hPa and 250 hPa and an overestimation below 600 *** also had the same bias compared with the in-situ CO profile;however,CAMS agreed well with the in-situ CO profile on 14 June in the troposphere because a weak cold vortex passed Xilin Hot on 13 June and disappeared on 14 *** the stratosphere,there were significant biases in the vertical *** striking agreement between the column-averaged mixing ratios and the diffierences in the vertical distribution suggests new exciting applications for the profile product.

关键词： Aircore greenhouse gas profile

企业员工的工作动机特点与激励机制的设计——改制国有企业与合资企业的比较研究

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科学学与科学技术管理 2007年第10期28卷 176-179页

作者：王璇李健马迁利北京理工大学管理与经济学院北京100081

对我国企业员工的工作动机进行问卷调查,运用统计分析的方法,对员工工作动机的构成和特点进行定量分析,并对国有企业员工与合资企业员工的工作动机进行对比分析,在此基础上提出我国企业尤其是改制国有企业员工有效激励的问题,并提出相... 详细信息

对我国企业员工的工作动机进行问卷调查,运用统计分析的方法,对员工工作动机的构成和特点进行定量分析,并对国有企业员工与合资企业员工的工作动机进行对比分析,在此基础上提出我国企业尤其是改制国有企业员工有效激励的问题,并提出相应的激励对策。

关键词：工作动机改制国有企业合资企业激励机制

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路测环境下无人驾驶小巴复杂场景运行评价

交通运输系统工程与信息 2024年第4期24卷 300-310页

作者：马千里王通邵帅贾鹏大连海事大学综合交通运输协同创新中心辽宁大连116026 大连海事大学航运经济与管理学院辽宁大连116026

以无人驾驶小巴为代表的客运自动驾驶工具在公交微循环中发挥着重要作用,为实现无人驾驶技术的商业化规模运用,除了传统的车辆性能测试外,还需评估其在复杂场景下的表现。由于测试数据缺乏,评价模型适用场景单一和评价方法主观等问题,... 详细信息

以无人驾驶小巴为代表的客运自动驾驶工具在公交微循环中发挥着重要作用,为实现无人驾驶技术的商业化规模运用,除了传统的车辆性能测试外,还需评估其在复杂场景下的表现。由于测试数据缺乏,评价模型适用场景单一和评价方法主观等问题,导致以往评价偏差较大。本文针对无人驾驶小巴的表现构建综合评价体系,并在实测数据的基础上,采用博弈论组合赋权的优劣解距离法(Technique for Order Preference by Similarity to Ideal Solution,TOPSIS)模型,对车辆在复杂场景下的表现进行综合评价。选取驾驶安全性、乘坐舒适性、车辆智能性及车辆高效性这4个评价维度,并细分为12个客观评价指标。首先,通过实地测试采集无人驾驶小巴在运行场景中的数据;其次,利用基于博弈论的组合赋权法,对层次分析法和熵权法获得的权重进行组合;最后,为验证模型的有效性,运用TOPSIS模型对3条具有不同复杂度的测试路线进行综合评价值的计算。结果显示,无人驾驶小巴表现评价中,准则层的重要程度排序为车辆智能性、驾驶安全性、乘坐舒适性、车辆高效性,指标层敏感指标则为自动驾驶状态、平均角速度。基于博弈论组合赋权的TOPSIS模型对不同场景复杂度路线进行的无人驾驶小巴表现评价结果与实际运行情况一致,展示了方法的有效性。

关键词：智能交通车辆评价实地测试自动驾驶组合赋权法