检索结果-南通市图书馆

Jigsaw-Sketch: a fast and accurate algorithm for finding top-k elephant flows in high-speed networks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第4期67卷 113-130页

作者： boyu zhang He HUANG Yu-E SUN Yang DU Dan WANG School of Computer Science and Technology Soochow University School of Rail Transportation Soochow University

Finding top-k elephant flows in high-speed networks is one of the most fundamental network measurement tasks. It is more challenging than per-flow size estimation since the IDs and sizes of top-k flows must be tracked simultaneously. Most existing studies only record the IDs of a small number of elephant flows to fit their estimators in the extremely limited high-speed on-chip memory. However, these solutions need too many memory accesses when a packet arrives to track the elephant flows with high accuracy, which limits their practicability. Therefore, this paper proposes Jigsaw-Sketch, a new algorithm to find the top-k elephant flows with much fewer memory accesses while achieving high memory efficiency and accuracy. In this design, we propose a novel two-stage jigsaw storage scheme, which can capture the candidate top-k flows from massive network steams efficiently, and further find the top-k elephant flows with high memory efficiency and only a few memory accesses for each packet. Extensive experimental results based on real network traces show that Jigsaw-Sketch improves the packet processing throughput by at least 86%, while achieving smaller memory footprints and higher accuracy compared to the SOTA.

关键词： sketch top-$k$ network measurement elephant flow high-speed networks

Dendrimer-induced synthesis of porous organosilica capsules for enzyme encapsulation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2024年第4期18卷 41-48页

作者： Ziyi Chu boyu zhang Zhenhua Wu Jiaxu zhang Yiran Cheng Xueying Wang Jiafu Shi Zhongyi Jiang School of Environmental Science&Engineering Tianjin UniversityTianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Organic matter-induced mineralization is a green and versatile method for synthesizing hybrid nanostructured materials,where the material properties are mainly influenced by the species of natural biomolecules,linear synthetic polymer,or small molecules,limiting their ***,we adopted dendrimer poly(amidoamine)(PAMAM)as the inducer to synthesize organosilica-PAMAM network(OSPN)capsules for mannose isomerase(MIase)encapsulation based on a hard-templating *** structure of OSPN capsules can be precisely regulated by adjusting the molecular weight and concentration of PAMAM,thereby demonstrating a substantial impact on the kinetic behavior of the MIase@OSPN *** MIase@OSPN system was used for catalytic production of mannose from Dfructose.A mannose yield of 22.24% was obtained,which is higher than that of MIase in organosilica network capsules and similar to that of the free *** overall catalytic efficiency(kcat/Km)of the MIase@OSPN system for the substrate D-fructose was up to 0.556 s^(-1)·mmol^(-1)·***,the MIase@OSPN system showed excellent stability and recyclability,maintaining more than 50% of the yield even after 12 cycles.

关键词： enzyme immobilization enzyme catalysis organosilica networks capsules sugar biosynthesis

Bioactivity of silk fibroin peptides on vascular endothelial cells

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2024年第1期18卷 85-94页

作者： Mengnan Dai Meng Li Peixuan Li boyu zhang Jianmei Xu Jiannan Wang National Engineering Laboratory for Modern Silk College of Textile and Clothing EngineeringSoochow UniversityNo.199 Ren-ai RoadSuzhou Industrial ParkSuzhou 215123China

To determine the contribution of non-repetitive domains to the bioactivity of the heavy chain in silk fibroin(SF)macromolecules,a gene motif f(1)encoding this fragment and its multimers(f(4)and f(8))were biosynthesized from Escherichia coli *** on the positive application potential of SF materials for the vascular tissue engineering,this study focused on examining the active response of these polypeptides to vascular endothelial *** polypeptides F(1),F(4),and F(8)were separately grafted onto the surfaces of bioinert polyethylene terephthalate(PET)films,resulting in remarkable improvements in the spread and proliferation of human umbilical vein endothelial cells(HUVECs).Using the same grafting dose,the activity of cells on polypeptide-modified PET films enhanced with the increase of the molecular weight of those grafted polypeptides from F(1)to F(8).Meanwhile,the growth of cells on the surface of the alkaline-treated PET film was improved,indicating that the hydrophilicity of the surface material had influence on the growth of ***,on surfaces with the same water contact angle,the spread and proliferation activity of cells on PET films were significantly lower than those on polypeptide-modified PET films.

关键词： silk fibroin heavy chain non-repetitive fragment cytoactive endothelial cell

从社会语境看非遗的保护与发展——以肉连响为例

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

黄钟（武汉音乐学院学报） 2024年第1期 39-47,167页

作者：张伯瑜香港中文大学(深圳)音乐学院中央音乐学院北京100031

湖北省利川市的肉连响入选国家级第二批(2008年)“非物质文化遗产代表作”。表演时,表演者拍打自己的身体,发出阵阵响声。这种起源于为乞讨而表演的“泥神道”在今天的社会语境下失去了原本的意义,成为了土家族文化的代表,目前也是锻炼... 详细信息

湖北省利川市的肉连响入选国家级第二批(2008年)“非物质文化遗产代表作”。表演时,表演者拍打自己的身体,发出阵阵响声。这种起源于为乞讨而表演的“泥神道”在今天的社会语境下失去了原本的意义,成为了土家族文化的代表,目前也是锻炼身体的手段和新创舞蹈作品的素材。该文通过来自田野的实际感受和相关研究文献的研读,思考“肉连响”及其类似的非遗音乐项目的保护与发展问题。作者认为,对于肉连响及其类似的非遗项目来说,保留原属语境的“完整保护”在今天不可能实现,变化与发展以使其适应今天的生活是必然之举,而这类非遗项目在原属语境中的发展程度(含“舞台化”“审美性”以及艺术性上的“完整性”)是我们思考非遗项目在今天的新语境中怎样保护和怎样发展的参考依据。非遗项目的形式与其原属语境和新语境之间变化的关系决定着非遗项目的保护与发展问题,也决定着非遗项目的功能转换。

关键词：肉连响土家族非遗刘守红舞台化

在线全文

学校读者我要写书评

暂无评论

郴州晋簡中的隸意和楷法略論

书法研究 2024年第3期 61-69,196页

作者：張博俣山東藝術學院書法學院

郴州晋簡作爲西晋時期的墨迹文書,部分楷書中還存在明顯的隸書筆意,而更多的楷書已經趨于標準的楷化用筆。本文以郴州晋簡中的楷書爲主要研究對象,分析其中遺留的隸書用筆及出現的原因,結合對郴州晋簡楷書中成熟楷法用筆形態的分析,試... 详细信息

郴州晋簡作爲西晋時期的墨迹文書,部分楷書中還存在明顯的隸書筆意,而更多的楷書已經趨于標準的楷化用筆。本文以郴州晋簡中的楷書爲主要研究對象,分析其中遺留的隸書用筆及出現的原因,結合對郴州晋簡楷書中成熟楷法用筆形態的分析,試圖探析郴州晋簡楷書中的字體演變和筆法自覺等諸多問題。

关键词：郴州晋簡隸意楷法古質今妍

基于MFDC-SSD网络的接触网定位线夹缺陷识别

在线全文

学校读者我要写书评

暂无评论

铁道学报 2024年第5期46卷 48-57页

作者：屈志坚张博语杨行李迪华东交通大学轨道交通基础设施性能监测与保障国家重点实验室江西南昌330013 华东交通大学电气与自动化工程学院江西南昌330013

针对接触网应用环境复杂,定位线夹体积小、安装方向特殊、不易识别,传统的目标检测算法效果较差等问题,基于多尺度特征融合密集连接网络模型,提出了一种接触网定位线夹缺陷检测新方法。首先结合DenseNet与Inception模块对SSD模型的特征... 详细信息

针对接触网应用环境复杂,定位线夹体积小、安装方向特殊、不易识别,传统的目标检测算法效果较差等问题,基于多尺度特征融合密集连接网络模型,提出了一种接触网定位线夹缺陷检测新方法。首先结合DenseNet与Inception模块对SSD模型的特征提取网络进行改进,在特定的特征层间共享上下文信息,提升特征提取能力。然后从网络深层到浅层,逐级采用FPN融合SSD检测的多尺度特征图,设计多特征融合的密集连接网络模型,最后将f GIoU作为边框损失函数,在训练中优化真实框和预测框的重合度。对采集的某段接触网定位线夹图像数据集进行检测识别。结果表明:该定位线夹缺陷检测方法可在复杂接触网背景下,对定位线夹脱落和松动进行检测,且在不同角度、亮度的图像中均具有较强的鲁棒性。

关键词：接触网缺陷识别定位线夹特征金字塔边界框损失函数

基于孪生多注意力网络的接触网侵限轻飘物跟踪

在线全文

学校读者我要写书评

暂无评论

铁道学报 2024年第2期46卷 45-55页

作者：屈志坚张博语朱琳梁家敏华东交通大学轨道交通基础设施性能监测与保障国家重点实验室江西南昌330013 华东交通大学电气与自动化工程学院江西南昌330013

针对接触网侵限轻飘物尺度变化大、遮挡干扰和铁路限界背景杂乱,易导致跟踪失败的问题,提出一种基于孪生多注意力网络的接触网轻飘物侵限跟踪新方法。引入三种注意力机制从更深层次提取轻飘物特征,通过空间注意力消除局部感受野限制,通... 详细信息

针对接触网侵限轻飘物尺度变化大、遮挡干扰和铁路限界背景杂乱,易导致跟踪失败的问题,提出一种基于孪生多注意力网络的接触网轻飘物侵限跟踪新方法。引入三种注意力机制从更深层次提取轻飘物特征,通过空间注意力消除局部感受野限制,通过通道注意力突出轻飘物类别的通道特征,将交叉注意力聚焦于目标模板与搜索图像信息,采用空间正则化滤波器抑制背景干扰,融合各部分特征实现对侵限轻飘物的跟踪。采用OTB100数据集进行精度与准度实验,以国家重点实验室试验线采集的数据为算例进行实验,通过消融实验验证了新方法的有效性。结果表明:相比于相关滤波类SRDCF算法和深度学习类SiamRPN++、DaSiamRPN算法,新方法可获得更好的鲁棒性和准确性。

关键词：接触网限界轻飘物注意力机制神经网络空间正则化

Conjugated microporous polymers-scaffolded enzyme cascade systems with enhanced catalytic activity

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2024年第8期63卷 213-223页

作者： Zhenhua Wu Jiafu Shi boyu zhang Yushuai Jiao Xiangxuan Meng Ziyi Chu Yu Chen Yiran Cheng Zhongyi Jiang School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China College of Chemical Engineering Fuzhou UniversityFuzhou 350108FujianChina Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207FujianChina

Enhancing catalytic activity of multi-enzyme in vitro through substrate channeling effect is promis-ing yet ***,conjugated microporous polymers(CMPs)-scaffolded integrated en-zyme cascade systems(I-ECSs)are constructed through co-entrapping glucose oxidase(GOx)and horseradish peroxidase(HRP),in which hydrogen peroxide(H_(2)O_(2))is the intermediate *** interplay of low-resistance mass transfer pathway and appropriate pore wall-H_(2)O_(2)interactions facilitates the directed transfer of H_(2)O_(2),resulting in 2.4-fold and 5.0-fold elevation in catalytic activ-ity compared to free ECSs and separated ECSs,*** substrate channeling effect could be regulated by altering the mass ratio of GOx to ***,I-ECSs demonstrate excellent stabili-ties in harsh environments and multiple recycling.

关键词： Biocatalysis Immobilization Enzyme cascade system Substrate channeling effect Conjugated microporous polymers

在线全文

学校读者我要写书评

暂无评论

无源声呐水下多目标融合跟踪方法

声学学报 2024年第3期49卷 501-512页

作者：梁国龙张博宇齐滨郝宇杜致尧李想哈尔滨工程大学水声技术全国重点实验室哈尔滨150001 工业和信息化部海洋信息获取与安全工信部重点实验室(哈尔滨工程大学) 哈尔滨150001 哈尔滨工程大学水声工程学院哈尔滨150001

针对海洋环境噪声导致弱目标在不同子频带检测结果差异较大,致使以全频带探测结果为输入的跟踪算法出现性能退化的问题,提出一种子带融合跟踪方法。该方法利用改进的高斯混合概率假设密度滤波器对各频率子带输出的方位估计结果进行跟踪... 详细信息

针对海洋环境噪声导致弱目标在不同子频带检测结果差异较大,致使以全频带探测结果为输入的跟踪算法出现性能退化的问题,提出一种子带融合跟踪方法。该方法利用改进的高斯混合概率假设密度滤波器对各频率子带输出的方位估计结果进行跟踪,并采用广义协方差交集准则对子带跟踪结果进行融合,以获得综合各子带信息的跟踪结果。仿真结果表明,所提方法可以提高弱目标在各子带信噪比不均衡情况下的跟踪能力,且运算时间与对比方法较为接近。海试数据处理结果进一步验证了所提方法的有效性。

关键词：无源声呐广义协方差交集高斯混合概率假设密度滤波器子带融合跟踪