检索结果-南通市图书馆

维普期刊数据库博看期刊

User Preference Aware Hierarchical Edge-User Cooperative Caching Strategy

在线全文

学校读者我要写书评

暂无评论

China Communications 2024年第6期21卷 69-86页

作者： Wu dapeng yang Lin Cui Yaping He Peng Wang Ruyan School of Communications and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China Advanced Network and Intelligent Connection Technology Key Laboratory of Chongqing Education Commission of China Chongqing 400065China Chongqing Key Laboratory of Ubiquitous Sensing and Networking Chongqing 400065China

The emergence of various new services has posed a huge challenge to the existing network *** improve the network delay and backhaul pressure,caching popular contents at the edge of network has been considered as a feasible ***,how to efficiently utilize the limited caching resources to cache diverse contents has been confirmed as a tough problem in the past *** this paper,considering the time-varying user requests and the heterogeneous content sizes,a user preference aware hierarchical cooperative caching strategy in edge-user caching architecture is *** divide the caching strategy into three phases,that is,the content placement,the content delivery and the content *** the content placement phase,a cooperative content placement algorithm for local content popularity is designed to cache contents *** the content delivery phase,a cooperative delivery algorithm is proposed to deliver the cached *** the content update phase,a content update algorithm is proposed according to the popularity of the ***,the proposed caching strategy is validated using the MovieLens dataset,and the results reveal that the proposed strategy improves the delay performance by at least 35.3%compared with the other three benchmark strategies.

关键词： cooperative caching network delay timevarying popularity user preference

在线全文

学校读者我要写书评

暂无评论

拉曼光谱气体检测装置设计及应用

光散射学报 2024年第3期36卷 249-259页

作者：黄保坤杨大鹏赵楚秋马昕月沈天阳孙睿李雨萌王子衿江苏海洋大学理学院江苏连云港222005 江苏海洋大学海洋工程学院江苏连云港222005

以气体状态存在的小分子,它们的拉曼光谱特征性强,谱线本征展宽小,即使在多种气体混合条件下,由于它们的特征拉曼光谱互相重叠较少,也可实现对多成分的同时检测分析。然而,气体的分子密度低,拉曼散射信号弱,限制了拉曼技术在气体检测方... 详细信息

以气体状态存在的小分子,它们的拉曼光谱特征性强,谱线本征展宽小,即使在多种气体混合条件下,由于它们的特征拉曼光谱互相重叠较少,也可实现对多成分的同时检测分析。然而,气体的分子密度低,拉曼散射信号弱,限制了拉曼技术在气体检测方面的应用。本文通过多重反射光学设计,提高拉曼光谱的激发效率,通过积分球设计增大拉曼散射信号的收集效率,构建高灵敏、多组分气体同时检出装置,可以实现无接触、无损、现场、原位分析,兼备定性和定量分析功能,对气体浓度的检测浓度范围宽,还适用于同分异构体分析以及同位素取代气体分子的分析,大大拓展了拉曼光谱技术在气体检测中的应用。

关键词：拉曼光谱气体拉曼积分球原位监控

Comparison of sample temperature effect on femtosecond and nanosecond laser-induced breakdown spectroscopy

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2021年第7期23卷 121-126页

作者： Miao LIU Anmin CHEN Yutong CHEN Xiangyu ZENG Qiuyun WANG Dan ZHANG dapeng yang Mingxing JIN Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012People’s Republic of China College of Instrumentation and Electrical Engineering Jilin UniversityChangchun 130061People’s Republic of China

In this paper,we investigated the emission spectra of plasmas produced from femtosecond and nanosecond laser ablations at different target temperatures in air.A brass was selected as ablated target of the *** results indicated that spectral emission intensity and plasma temperature showed similar trend for femtosecond and nanosecond lasers,and the two parameters were improved by increasing the sample temperature in both ***,the temperature of nanosecond laser-excited plasma was higher compared with that of femtosecond laser-excited plasma,and the increase of the plasma temperature in the case of nanosecond laser was more *** addition,there was a signiﬁcant difference in electron density between femtosecond and nanosecond laser-induced *** electron density for femtosecond laser decreased with increasing the target temperature,while for nanosecond laser,the electron density was almost unchanged at different sample temperatures.

关键词： laser-induced breakdown spectroscopy femtosecond laser nanosecond laser target temperature

Incidence and predictors of futile recanalisation after endovascular therapy in acute vertebrobasilar artery occlusion patients:insight from the ANGEL-ACT registry

在线全文

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2024年第3期9卷 289-294,I0248-I0250页

作者： dapeng Sun Xinguang yang Xiaochuan Huo Raynald- Baixue Jia Xu Tong Anxin Wang Ning Ma Feng Gao dapeng Mo Zhongrong Miao Interventional Neuroradiology Department of NeurologyBeijing Tiantan HospitalCaptial Medical UniversityBeijingChina Department of Neurology Sun Yat-Sen Memorial HospitalGuangzhouGuangdongChina Cerebrovascular Disease Department Neurological Disease CenterBeijing Anzhen HospitalCapital Medical UniversityBeijingChina China National Clinical Research Center for Neurological Diseases Beijing Tiantan HospitalCapital Medical UniversityBeijingChina

Objectives To identify the occurrence rate and predictors of futile recanalisation after endovascular therapy(EVT)for acute vertebrobasilar artery occlusion(VBAO).Methods Participants of the Endovascular Treatment Key Technique and Emergency Workflow Improvement of Acute Ischaemic Stroke(ANGEL-ACT)registry were selected for the *** recanalisation was defined as patients did not achieve a 90-day good outcome(modified Rankin Scale≤3)despite successful recanalisation(modified Treatment in Cerebral Ischaemia Scale≥2b)after the *** logistic regression analysis was conducted to find independent predictors of futile recanalisation in VBAO patients undergoing *** Three hundred and fifteen patients with VBAO who achieved successful recanalisation after EVT were included in current analysis,of whom,155(49.2%)suffered futile recanalisation,and 160 achieved effective *** the multivariable analysis,we found admission National Institutes of Health Stroke Scale(NIHSS)≥19(OR 4.81,95%CI 2.76 to 8.39,p<0.001),platelet-lymphocyte ratio(PLR)≥162.2(OR 1.93,95%CI 1.14 to 3.27,p=0.001),onset-to-puncture time(OTP)≥334min(OR 2.15,95%CI 1.25 to 3.68,p=0.005)and use of general anesthesia(GA)(OR 1.87,95%CI 1.09 to 3.22,p=0.024)were associated with futile *** Futile recanalisation after EVT occurred 49.2%of VBAO patients in the ANGEL-ACT ***≥19,PLR≥162.2,OTP≥334min and use of GA were independent predictors of futile recanalisation.

关键词： patients anesthesia occlusion

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

弹塑性疲劳微弯裂纹尖端塑性区问题

应用力学学报 2007年第4期24卷 578-583页

作者：杨大鹏赵耀华中科技大学武汉430074

主要研究疲劳载荷作用下弹塑性裂纹弯曲延伸扩展问题。通过分析论证,比较精确地研究了疲劳载荷作用下弯曲延伸裂纹尖端塑性区域边界上交变应力的分布状况。综合考虑了疲劳作用应力,塑性区域交变应力,利用二阶摄动方法,研究计算了弯曲延... 详细信息

主要研究疲劳载荷作用下弹塑性裂纹弯曲延伸扩展问题。通过分析论证,比较精确地研究了疲劳载荷作用下弯曲延伸裂纹尖端塑性区域边界上交变应力的分布状况。综合考虑了疲劳作用应力,塑性区域交变应力,利用二阶摄动方法,研究计算了弯曲延伸裂纹尖端塑性区域的范围,并预测了疲劳载荷作用下弹塑性裂纹扩展路径。

关键词：弯曲延伸裂纹塑性区域边界疲劳作用应力二阶摄动方法

数据开放共享的机制与对策研究:基于浙江的经验分析

在线全文

学校读者我要写书评

暂无评论

中国软科学 2021年第S1期 392-398页

作者：杨大鹏中共浙江省委党校工商管理教研部浙江杭州311121

数据开放共享是数字化时代提升治理体系和治理能力、实现小康目标的基本要求。本文以浙江推进社会治理结构和能力现代化为例,梳理当前数据开放共享中取得的进展,从数据来源、开放范围、制度建设和隐私保护等方面分析存在的问题,从数据... 详细信息

数据开放共享是数字化时代提升治理体系和治理能力、实现小康目标的基本要求。本文以浙江推进社会治理结构和能力现代化为例,梳理当前数据开放共享中取得的进展,从数据来源、开放范围、制度建设和隐私保护等方面分析存在的问题,从数据价值链上的数据获取、数据使用、数据价值和数据保护等环节对其本质矛盾开展分析。并构建包括理念、制度、技术、组织、主体五大层面的数据开放共享提升机制,为高水平全面建成小康社会和加快治理能力现代化提供了参考和建议。

关键词：数据开放数据共享治理能力现代化

Study on Automatic Generation Algorithm of LOD Model based on Complex Features

在线全文

学校读者我要写书评

暂无评论

International Journal of Technology Management 2013年第9期 45-47页

作者： Sun dapeng yang ChengJie School of Resources and Environment North China University of Water Resources and Electric Power ZhengZhou China

For certain applications, the paper proposes a LOD generation algorithm based on model feature, to measure the value of certain features as weight, and to just the geometrical characteristics and retains the full feature in the simplified model. Algorithm is simple and intuitive, LOD models can be generated by a continuous smooth transition and meet the requirements of real-time display. Experimental results show the effectiveness of the algorithm. Algorithm is simple and quick, broad applicability, the improve simplified algorithm is very suitable for modulation texture operator, generating algorithm based on a lookup table to meet the model requirements for real-time display.

关键词： virtual reality LOD models improved model

数字赋能乡村振兴实现共同富裕的实践路径和对策

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

中国软科学 2022年第S1期 71-75页

作者：杨大鹏中共浙江省委党校工商管理教研部浙江杭州311121

乡村振兴是共同富裕的根本要求,数字赋能乡村振兴成为共同富裕推进过程中的重要路径。在系统梳理数字赋能乡村振兴的现实价值和实践问题的基础上,以浙江“数字+治理”“数字+信用”“数字+产业”3条实践路径为例,探索数字赋能乡村振兴... 详细信息

乡村振兴是共同富裕的根本要求,数字赋能乡村振兴成为共同富裕推进过程中的重要路径。在系统梳理数字赋能乡村振兴的现实价值和实践问题的基础上,以浙江“数字+治理”“数字+信用”“数字+产业”3条实践路径为例,探索数字赋能乡村振兴的实践路径,明确基层治理、乡村文化和乡村产业是数字赋能的重点领域,并针对性地提出加快建设数字基础设施、强化基层治理能力、推进物质精神共富、农业数字化转型和数字化环境塑造5方面的对策建议,为高质量发展建设共同富裕示范区提供参考借鉴。

关键词：数字赋能乡村振兴共同富裕

Effect of kerosene injection states on mixing and combustion characteristics in a cavity-based supersonic combustor

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第4期37卷 308-320页

作者： Xu LIU Peibo LI Fei LI Hongbo WANG Mingbo SUN Chao WANG Yixin yang dapeng XIONG Yanan WANG Science and Technology on Scramjet Laboratory College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China

It has been found that the static pressure distribution along the axial direction of liquid kerosene is lower than that of the gaseous kerosene under the same flow condition and overall equivalent ratio from previous *** further investigate this phenomenon,a compressible two-phase parallel simulation method is utilized to analyze the mixing and combustion characteristics of gaseous and liquid kerosene jets in a cavity-based supersonic *** numerical results are consistent with the experiments and demonstrate that gaseous injection leads to a cavity shear layer that dives deeper into the cavity,forming two recirculation zones in the front and rear of the *** contrast,the cavity shear layer is closer to the mainstream during liquid injection,and only a large recirculation zone is formed in the rear of the *** a result of the cavity shear layer and the recirculating flow,the fuel vapor of gaseous injection accumulates in the front of the cavity,while for the liquid injection,the fuel vapor disperses in the cavity,cavity shear layer,and the region above,and the rear of the cavity has a higher fuel vapor concentration than the *** unique fuel distribution causes the combustion area to be concentrated in the cavity during the gaseous injection but dispersed inside and downstream of the cavity during the liquid *** a result,forming a thermal throat under the same conditions is more challenging during liquid injection,and the generated static pressure distribution is lower than that during the gaseous injection.

关键词： Gaseous injection Liquid injection Mixing process Combustion Supersonic flow