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一种基于投票机制的代表点选择算法

计算机应用 2007年第1期27卷 77-79页

作者：任江涛丘正元纪庆革中山大学计算机科学系广东广州510275

代表点选择是面向数据挖掘与模式识别的数据预处理的重要内容之一,是提高分类器分类正确率和执行效率的重要途径。提出了一种基于投票机制的代表点选择算法,该算法能使所得到的代表点尽可能分布在类别边界上,且投票选择机制易于排除异常... 详细信息

代表点选择是面向数据挖掘与模式识别的数据预处理的重要内容之一,是提高分类器分类正确率和执行效率的重要途径。提出了一种基于投票机制的代表点选择算法,该算法能使所得到的代表点尽可能分布在类别边界上,且投票选择机制易于排除异常点,减少数据量,从而有利于提高最近邻分类器的分类精度和效率。通过与多个经典的代表点选择算法的实验比较分析,表明所提出的基于投票机制的代表点选择算法在提高最近邻分类器分类精度和数据降低率上都具有一定的优势。

关键词：代表点选择最近邻分类投票机制

Nanograting-Based Dynamic Structural Colors Using Heterogeneous Materials

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NANO-MICRO LETTERS 2025年第1期17卷 1-14页

作者： Wang, Jingang Yu, Haibo zheng, Jianchen Zhang, Yuzhao Guo, Hongji qiu, Ye Wang, Xiaoduo Yang, Yongliang Liu, Lianqing Chinese Acad Sci Shenyang Inst Automat State Key Lab Robot Shenyang 110016 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

A 2.5-dimensional dynamic structural color based on nanogratings of heterogeneous materials was proposed by interweaving a pH-responsive hydrogel with IP-L *** nanogrid structures exhibit brilliant tuneable structural color, high sensitivity, and ultrafast recovery speeds in response to *** 4D printing-based grayscale design approach was proposed for the patterned encoding and array printing of dynamic structural colors, promoting their application in patterned printing, information encryption, and microfluidic chip sensing. Dynamic structural colors can change in response to different environmental stimuli. This ability remains effective even when the size of the species responsible for the structural color is reduced to a few micrometers, providing a promising sensing mechanism for solving microenvironmental sensing problems in micro-robotics and microfluidics. However, the lack of dynamic structural colors that can encode rapidly, easily integrate, and accurately reflect changes in physical quantities hinders their use in microscale sensing applications. Herein, we present a 2.5-dimensional dynamic structural color based on nanogratings of heterogeneous materials, which were obtained by interweaving a pH-responsive hydrogel with an IP-L photoresist. Transverse gratings printed with pH-responsive hydrogels elongated the period of longitudinal grating in the swollen state, resulting in pH-tuned structural colors at a 45 degrees incidence. Moreover, the patterned encoding and array printing of dynamic structural colors were achieved using grayscale stripe images to accurately encode the periods and heights of the nanogrid structures. Overall, dynamic structural color networks exhibit promising potential for applications in information encryption and in situ sensing for microfluidic chips.

关键词： Dynamic structural colors Four-dimensional printing pH-responsive Nanogrid Heterogeneous materials

有为政府与有效市场下的我国职业教育治理:理论逻辑与实践路径

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高校教育管理 2025年第1期19卷 62-73页

作者：李政邱懿华东师范大学职业教育与成人教育研究所上海200062 中华人民共和国教育部职业教育与成人教育司北京100816 北京大学教育学院北京100871

政府与市场的关系是职业教育内外部治理关系的核心,先后经历了政府主导论、市场基础论、有为政府与有效市场论的演变。在有为政府与有效市场的关系形塑下,职业教育治理改革应实现三大转变,即政府治理方式应从事后响应转变为事前布局,职... 详细信息

政府与市场的关系是职业教育内外部治理关系的核心,先后经历了政府主导论、市场基础论、有为政府与有效市场论的演变。在有为政府与有效市场的关系形塑下,职业教育治理改革应实现三大转变,即政府治理方式应从事后响应转变为事前布局,职业院校治理角色应从代理主体转变为改革先锋,市场主体参与治理的动机应从短期利益转变为战略投资。政府、职业院校和市场的关系应由单向的“影响回应”关系转变为双向的“并行互动”关系。当前,我国政府参与职业教育治理的权责边界不清,职业院校办学自主权无法满足发展需求,市场主体参与职业教育缺乏战略自觉。为此,我国应加强各级政府的政策协作,提升政府政策的精准度和前瞻性;优化职业院校组织定位和内部治理模式,提升学校治理的灵活性和有效性;深度分析企业发展的外部条件和内部需求,提升企业发展的积极性和适应性。

关键词：职业教育治理有为政府有效市场全面深化改革办学自主权

The compound(E)-2-(3,4-dihydroxystyryl)-3-hydroxy-4H-pyran-4-one alleviates neuroinflammation and cognitive impairment in a mouse model of Alzheimer's disease

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Neural Regeneration Research 2025年第11期20卷 3330-3344页

作者： Xueyan Liu Wei Wu Xuejuan Li Chengyan Wang Ke Chai Fanru yuan Huijuan zheng Yuxing Yao Chenlu Li Zu-Cheng Ye Daijun Zha Department of Medicinal Chemistry School of PharmacyFujian Medical UniversityFuzhouFujian ProvinceChina Fujian Provincial Key Laboratory of Brain Aging and Neurodegenerative Diseases School of Basic Medical SciencesFujian Medical UniversityFuzhouFujian ProvinceChina Institute of Laboratory Animal Center Fujian Medical UniversityFuzhouFujian ProvinceChina Department of Neurosurgery Neurosurgery Research InstituteThe First Affiliated HospitalFujian Medical UniversityFuzhouFujian ProvinceChina Department of Hyperbaric Oxygen National Regional Medical CenterBinhai Campus of the First Affiliated HospitalFujian Medical UniversityFuzhouFujian ProvinceChina

Previous studies have shown that the compound(E)-2-(3,4-dihydroxystyryl)-3-hydroxy-4H-pyran-4-one(D30),a pyromeconic acid derivative,possesses antioxidant and anti-inflammatory properties,inhibits amyloid-β aggregation,and alleviates scopolamine-induced cognitive impairment,similar to the phase Ⅲ clinical drug *** this study,we established a mouse model of Alzheimer's disease via intracerebroventricular injection of fibrillar amyloid-β to investigate the effect of D30 on fibrillar amyloid-β-induced *** results showed that D30 alleviated fibrillar amyloid-β-induced cognitive impairment,promoted fibrillar amyloid-β clearance from the hippocampus and cortex,suppressed oxidative stress,and inhibited activation of microglia and astrocytes.D30 also reversed the fibrillar amyloid-β-induced loss of dendritic spines and synaptic protein ***,we demonstrated that exogenous fibrillar amyloid-βintroduced by intracerebroventricular injection greatly increased galectin-3 expression levels in the brain,and this increase was blocked by *** the role of D30 in clearing amyloid-β,inhibiting neuroinflammation,protecting synapses,and improving cognition,this study highlights the potential of galectin-3 as a promising treatment target for patients with Alzheimer's disease.

关键词： Alzheimer's disease amyloid-β astrocyte cognitive impairment D30 dendritic spines galectin-3 microglia neuroinflammation neuron

基于电网自适应动态分区的继电保护一体化整定计算方法浅析

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自动化技术与应用 2019年第2期38卷 174-176,185页

作者：符云陈大华郑秋元黄欢海南电网有限责任公司电力调度控制中心海南海口570203 北京中恒博瑞数字电力科技有限公司北京100085

提出了省地县继电保护一体化整定计算系统的电网分区计算关键技术。首先给出了配合区域和约束区域的含义及确定方法 ,在此基础上采用遗传算法实现了全网的厂站划分。考虑到传统分区算法没有计及全网的动态运行状态,为此采用半监督谱聚... 详细信息

提出了省地县继电保护一体化整定计算系统的电网分区计算关键技术。首先给出了配合区域和约束区域的含义及确定方法 ,在此基础上采用遗传算法实现了全网的厂站划分。考虑到传统分区算法没有计及全网的动态运行状态,为此采用半监督谱聚类实现了全网模型的动态分区。最后,根据边界支路、运行方式实时调节,选择合适的配合区域及约束区域,获得整定计算的最终计算模型。

关键词：继电保护整定计算遗传算法动态分区半监督谱聚类

1976-2013年四川省高县流行性脑脊髓膜炎流行病学分析

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寄生虫病与感染性疾病 2014年第3期12卷 147-149页

作者：王代良郑远秋辜玲玉四川省高县疾病预防控制中心四川高县645150

目的分析四川省高县流行性脑脊髓膜炎（流脑）流行趋势,为有效控制流脑暴发和流行及探索经济有效的预防控制策略提供流行病学依据。方法对高县流脑发病数和死亡数报告资料进行统计整理,采用描述性流行病学分析。结果 1976-2013年共报... 详细信息

目的分析四川省高县流行性脑脊髓膜炎（流脑）流行趋势,为有效控制流脑暴发和流行及探索经济有效的预防控制策略提供流行病学依据。方法对高县流脑发病数和死亡数报告资料进行统计整理,采用描述性流行病学分析。结果 1976-2013年共报告流脑2 066例,死亡病例57例,年均发病率、死亡率和病死率分别为11.60/10万、0.32/10万和2.76%,发病率经趋势卡方检验,差异有统计学意义（χ^2=2916.60,P〈0.01）;全县19个乡镇均有流脑发病,发病居前3位的乡镇是文江、庆符和罗场,构成比分别为46.22%、16.99%和5.61%;2-4月是发病高峰,占病例总数的75.99%;发病率居前3位的是0~4岁、5~9岁和10~14岁年龄组,分别为21.70/10万、58.75/10万和34.24/10万;男女病例性别比1.25：1,农民发病最多,占病例总数的58.13%,其次为学龄前儿童占病例总数的19.80%。结论高县流脑发病率呈明显下降趋势,但仍存在流行的隐患。发病具有明显的季节性,15岁以下年龄段是高危人群,提高儿童流脑疫苗的有效接种率是控制流行的关键。

关键词：流行性脑脊髓膜炎流行病学

2004-2010年高县医疗机构传染病漏报调查

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寄生虫病与感染性疾病 2012年第2期10卷 95-98页

作者：张平李朝兰郑远秋张敏朱毅高县疾病预防控制中心四川高县645150

目的根据高县2004-2010年医疗机构法定传染病漏报调查结果,分析漏报原因,提高报告质量,找出科学对策。方法对2004-2010年高县传染病漏报调查相关资料进行统计分析。结果 2004-2010年高县不同级别医疗机构平均漏报率0.95%,漏报前3位病种... 详细信息

目的根据高县2004-2010年医疗机构法定传染病漏报调查结果,分析漏报原因,提高报告质量,找出科学对策。方法对2004-2010年高县传染病漏报调查相关资料进行统计分析。结果 2004-2010年高县不同级别医疗机构平均漏报率0.95%,漏报前3位病种依次为病毒性肝炎(2.03%)、其他感染性腹泻(1.59%)、痢疾(1.23%)。各级医疗机构传染病漏报率差异无统计学意义(χ2=0.025,P>0.05)。2004-2010年各年传染病漏报率差异无统计学意义(χ2=0.048,P>0.05)。不同级别医疗机构相关人员传染病防治相关知识问卷知晓率差异有统计学意义(χ2=87.103,P<0.01)。结论 2004-2010年高县传染病漏报率较低,有规范的网络报告系统,畅通疫情信息和反馈机制,能降低医疗卫生机构传染病的漏报。

关键词：医疗机构传染病漏报调查

Hysteretic Nonlinearity of Sub-harmonic Emission from Ultrasound Contrast Agent Microbubbles

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Chinese Physics Letters 2011年第4期28卷 126-129页

作者： qiu yuan-yuan zheng Hai-Rong ZHANG Dong Institute of Acoustics Key Lab of Modern AcousticsNanjing UniversityNanjing 210093 Institute of Biomedical and Health Engineering Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518067

Sub-harmonic contrast imaging promises to improve ultrasound imaging quality by taking advantage of increased contrast to tissue *** aim of this study is to examine the hysteretic nonlinearity of sub-harmonic component emitted from *** kinds of microbubble solutions,***■and a self-developed contrast agent,are utilized in the *** hysteretic curves for increasing and decreasing acoustic pressure are theoretically predicted by the Marmottant model and confirmed by *** results reveal that for both microbubble solutions,the development of the rising ramp undergoes three stages,***,growth and saturation;while hysteresis effect appears in the descending *** Vue■microbubbles exhibit better sub-harmonic performance over the self-developed UCAs microbubbles due to the difference of elastic properties of the shell.

关键词： harmonic bubble bubbles

ZM1 magnesium alloy reinforced by carbon nanotubes using an improved casting process

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Rare Metals 2021年第5期40卷 1275-1283页

作者： qiu-Hong yuan Lin Liao Guo-Hua Zhou zheng-Yun Liu Physical Science and Technology College Yichun UniversityYichun 336000China Department of Materials Processing Engineering Nanchang UniversityNanchang 330031China

Melt processing is a promising process to fabricate Mg-CNTs(carbon nanotubes)composites with high performance and large *** this work,the liquidmixing technique and ball-milling processes as well as the stirring casting method were used to prepare ZM1-1.0 CNTs-L and ZM1-1.0 CNTs-B composites,*** composites were studied using optical microscopy(OM),Raman spectroscopy,scanning electron microscope(SEM),transmission electron microscope(TEM)and room-temperature tensile *** results show that the yield strength(YS),ultimate tensile strength(UTS),elongation and microhardness values of the ***-L composite are improved by 37.3%,29.6%,37.0%and33.3%,respectively,compared with those of ZM1 *** uniform dispersion of CNTs as well as the strong interfacial bonds with the Mg matrix is the main reason for the significant improvement in mechanical properties of the as-cast *** mixing combined with the stirring casting method is favorable to fabricate Mg-CNTs composite with high mechanical properties.

关键词： ZM1 alloy Carbon nanotubes(CNTs) Composites Microstructure Mechanical properties