检索结果-南通市图书馆

CAAI Transactions on Intelligence Technology 2022年第4期7卷 582-593页

作者： Xudong Gao wenjie cao Qiang Yang Honglin Wang Xiaolei Wang Guang Jin Jun Zhang School of Artificial Intelligence/School of Future Technology Nanjing University of Information Science and TechnologyNanjingChina School of Electronic and Information Zhongyuan University of TechnologyZhengzhouChina Graduate School of Engineering Tokyo University of Agriculture and TechnologyKoganeiTokyoJapan

The closed-loop wireless power transfer(WPT)system can realize constant voltage output in the presence of ***,the parameter design of the controller is a difficult *** traditional trial-and-error method is time-consuming and difficult to find optimal parameters.A parameter optimization strategy of control systems for uncertain WPT systems using the modified genetic algorithm(MGA)is ***,because the system has different characteristics at different periods,the simulation process is divided into three *** first one is the start-up stage,in which we mainly consider the overshoot and the rate of the voltage *** second one is the tracking stage,in which the tracking time and switching loss are mainly *** third one is the stabilisation stage,in which the steady-state error and switching loss are mainly ***,three cost functions are designed according to the characteristics of the three stages,and then the optimal controller parameters of each stage are obtained by using ***,the effectiveness of the proposed method is verified by *** optimization results show that compared with the previous parameter optimization method,the optimal controller parameters obtained by the proposed method make the WPT system achieve better performance.

关键词： power optimization system

Comparison of sampling schemes for spatial predictionof soil organic carbon in Northern China

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

Research in Cold and Arid Regions 2020年第4期12卷 200-216页

作者： XuYang Wang YuQiang Li YuLin Li YinPing Chen Jie Lian wenjie cao Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhouGansu 730000China University of Chinese Academy of Sciences Beijing 100049China Naiman Desertification Research Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesTongliaoInner Mongolia 028300China School of Environmental and Municipal Engineering Lanzhou Jiaotong UniversityLanzhouGansu 730070China

Determining an optimal sample size is a key step in designing field surveys,and is particularly important for detecting the spatial pattern of highly variable properties such as soil organic carbon(SOC).Based on 550 soil sampling points in the nearsurface layer(0 to 20 cm)in a representative region of northern China's agro-pastoral ecotone,we studied effects of four interpolation methods such as ordinary kriging(OK),universal kriging(UK),inverse distance weighting(IDW)and radial basis function(RBF)and random subsampling(50,100,200,300,400,and 500)on the prediction accuracy of SOC *** the Shannon's Diversity Index(SHDI)and Shannon's Evenness Index(SHEI)was 2.01 and 0.67,the OK method appeared to be a superior method,which had the smallest root mean square error(RMSE)and the mean error(ME)nearest to *** the contrary,the UK method performed poorly for the interpolation of SOC in the present *** sample size of 200 had the most accurate prediction;50 sampling points produced the worst prediction ***,we used 200 samples to estimate the study area's soil organic carbon density(SOCD)by the OK *** total SOC storage to a depth of 20 cm in the study area was 117.94 Mt,and its mean SOCD was 2.40 kg/*** SOCD kg/(C⋅m2)of different land use types were in the following order:woodland(3.29)>grassland(2.35)>cropland(2.19)>sandy land(1.55).

关键词： soil organic carbon sample size geostatistics kriging prediction accuracy

Low-dose intravenous tissue plasminogen activator for acute ischaemic stroke: an alternative or a new standard?

在线全文

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2016年第3期1卷 115-121页

作者： Yi Dong wenjie cao Xin Cheng Kun Fang Fei Wu Lumeng Yang Yanan Xie Qiang Dong The Department of Neurology Huashan HospitalFudan UniversityShanghaiShanghaiChina

Background:With the recent publication of a large clinical trial on the use of a lower dose of intravenous(IV)tissue plasminogen activator(tPA)for acute ischaemic stroke(AIS),the concept of using a different dose has been *** intend to review the literature on using a lower dose of IV tPA and gain a better understanding of the impact of different IV doses on the treatment of patients with ***:A comprehensive literature search of the related topics in PubMed,EMBASE,Web of Science and MEDLINE was carried *** words used include low dose IV tPA,thrombolysis,Alteplace and tPA for *** were tabulated according to the size of the cohort studied,outcome,adverse event and level of *** results of all studies using lower doses were analysed for efficacy and adverse ***:From 1992 to 2016,there were 23 trials that included 10950 patients published on the use of lower doses of IV tPA for *** ranged from 0.5,0.6,0.75 to 0.85 mg/*** were observational,retrospective and registry *** was a prospective open-label randomised controlled trial.13 trials combined lower doses of IV tPA with a glycoprotein IIb/IIIa inhibitor or *** treated with lower doses of IV tPA showed a trend of lower rate of symptomatic intracranial haemorrhage and mortality at 3 months but slightly more ***:Lower doses of IV tPA showed less haemorrhagic events but were not more effective compared with the standard *** optimal low dose of IV tPA remains *** with AIS with a high risk of developing sypmtomatic intracranial haemorrhage might benefit from lower dose IV tPA,such as 0.6 mg/kg.

关键词： doses intravenous acute

Endovascular treatment for basilar artery occlusion:a meta-analysis

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

Stroke & Vascular Neurology 2023年第1期8卷 1-3页

作者： Jiawen Xu Xi Chen Shidong Chen wenjie cao Hongchen Zhao Wei Ni Yanrong Zhang Chao Gao Yuxiang Gu Xin Cheng Yi Dong Qiang Dong Department of Neurology Huashan Hospital Fudan UniversityShanghaiChina Department of Neurosurgery Huashan Hospital Fudan UniversityShanghaiChina Department of Nursing Huashan Hospital Fudan UniversityShanghaiChina

Acute basilar artery occlusion(BAO)may lead to severe disability or death in about 70%of patients.12 Previous studies have estab-lished endovascular treatment(EVT)as the standard treatment for patients with acute ante... 详细信息

关键词： treatment artery death

Image Classification of Time Series Based on Deep Convolutional Neural Network

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

Image Classification of Time Series Based on Deep Convolutio...

国际农业面源污染研究演进与前沿——基于CiteSpace的量化分析

第40届中国控制会议

作者： wenjie cao Cheng Zhang Zhenzhen Xiong Ting Wang Junchao Chen Bengong Zhang Research Center of Nonlinear Science Wuhan Textile University School of Mathematics and Computer Science Wuhan Textile University

Convolutional Neural Networks（CNN） have achieved great success in image recognition tasks by automatically learning hierarchical feature representations from raw *** time series classification（TSC） mainly focuses on one-dimensional *** this paper,we plan to study high dimensional time series *** main idea is following:Firstly,data enhancement is done which means that we use synthetic minority oversampling technique（SMOTE） to preprocess the arrhythmia ***,we use recurrence plot（RP） to convert the time series into two dimensional texture ***,the deep CNN classifier is used for *** finally,time series classification can be regarded as the texture image recognition *** arrhythmia data is used to demonstrate the effectiveness of the proposed method for processing time series data sets.

关键词： Time series classification Recurrence plot Convolutional Neural Network Image recognition classification

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

干旱区资源与环境 2019年第7期33卷 1-9页

作者：曹文杰赵瑞莹山东农业大学经济管理学院泰安271008 山东财经大学公共管理学院济南250014

文中借助文献计量分析软件CiteSpace,基于Web of Science数据库核心数据合集,对国际农业面源污染研究的主题演进及前沿进行可视化分析。研究发现:国际农业面源污染研究聚类主题众多且各主题形成时间各异持续时间不一,主题间连线表明其... 详细信息

文中借助文献计量分析软件CiteSpace,基于Web of Science数据库核心数据合集,对国际农业面源污染研究的主题演进及前沿进行可视化分析。研究发现:国际农业面源污染研究聚类主题众多且各主题形成时间各异持续时间不一,主题间连线表明其螺旋式动态演进过程。在知识溢出的推动下,农业面源污染研究呈现出较强的波段特征,先后经历了概念化阶段、以污染因素分析及污染物迁移机理为特征的细化研究及研究工具建设阶段、以计算机模型模拟为主的工具研究丰富阶段以及当前以治理为主题的研究扩张阶段。目前仍然活跃的聚类主题包括水质管理政策、模型模拟技术的适用与拓展及最佳管理实践。聚类发展趋势表明,水质政策响应滞后时间量化、生态网络分析、最佳管理实践的适用性及成本效益等是当前的前沿研究领域。高突现关键字"系统"、"政策"、"水质量"等预示着当前研究热点指向系统研究及污染治理政策研究。

关键词：农业面源污染研究综述 CiteSpace WOS数据库

在线全文

学校读者我要写书评

暂无评论

生长素输出载体PIN蛋白的质膜定位机制

植物学报 2016年第2期51卷 265-273页

作者：曹文杰李贵生吉首大学植物资源保护与利用湖南省高校重点实验室吉首416000

生长素浓度梯度影响植物个体及其器官的形态建成,而PIN(PIN-FORMED)蛋白决定组织中的生长素流向。细胞质膜的脂筏特性是PIN蛋白在质膜上不均匀分布的基础。与此同时,网格蛋白介导的胞吞、蛋白质的磷酸化/去磷酸化甚至基因的转录调控影响... 详细信息

生长素浓度梯度影响植物个体及其器官的形态建成,而PIN(PIN-FORMED)蛋白决定组织中的生长素流向。细胞质膜的脂筏特性是PIN蛋白在质膜上不均匀分布的基础。与此同时,网格蛋白介导的胞吞、蛋白质的磷酸化/去磷酸化甚至基因的转录调控影响PIN蛋白的这种极性定位。另外,在多细胞植物起源之时,PIN蛋白可能经历了从内质网膜定位到质膜定位的转变。

关键词：生长素 PIN 胞吞磷酸化植物进化

在线全文

学校读者我要写书评

暂无评论

创意产业集群品牌化战略研究

改革与战略 2011年第10期27卷 127-130页

作者：邝光明曹文杰浙江工商大学工商管理学院浙江杭州310018

创意产业集群走向品牌化是创意产业发展的一个必然趋势。当前,我国创意产业集群品牌存在集群品牌意识不强、集群品牌产权不清、缺乏龙头品牌和创意型人才等问题。在结合以往研究成果的基础上,文章就这些突出问题提出要以品牌定位、注重... 详细信息

创意产业集群走向品牌化是创意产业发展的一个必然趋势。当前,我国创意产业集群品牌存在集群品牌意识不强、集群品牌产权不清、缺乏龙头品牌和创意型人才等问题。在结合以往研究成果的基础上,文章就这些突出问题提出要以品牌定位、注重营销、创新和产权保护为主要对策。

关键词：创意产业集群集群品牌化品牌创新

基于参数化时频分析的进动锥裙目标瞬时微多普勒频率提取方法

在线全文

学校读者我要写书评

暂无评论

电子与信息学报 2016年第1期38卷 90-96页

作者：肖金国杜兰韩勋曹文杰刘宏伟西安电子科技大学雷达信号处理国家重点实验室西安710071

微动目标散射点的微多普勒对目标运动、结构参数的估计具有重要意义。该文针对表面光滑的锥裙目标,首先依据进动锥裙目标的等效散射点模型,推导出散射点的理论微多普勒曲线表达式。结合进动调制的锥裙目标微多普勒曲线为多阶正弦级数叠... 详细信息

微动目标散射点的微多普勒对目标运动、结构参数的估计具有重要意义。该文针对表面光滑的锥裙目标,首先依据进动锥裙目标的等效散射点模型,推导出散射点的理论微多普勒曲线表达式。结合进动调制的锥裙目标微多普勒曲线为多阶正弦级数叠加的先验信息,提出一种基于参数化时频分析的进动锥裙目标微多普勒曲线提取方法。针对多分量信号组成的锥裙目标回波,该方法利用相干信号单距离多普勒干涉(CSRDI)方法估计锥旋频率,进而利用参数化时频分析估计散射点的微多普勒曲线,之后利用带阻滤波器分离估计得到的散射点回波信号。基于电磁仿真数据验证了所提方法的有效性。

关键词：锥裙目标进动微多普勒参数化时频分析相干信号单距离多普勒干涉方法

在线全文

学校读者我要写书评

暂无评论

对口医疗支援中白内障超声乳化复明手术体会

中国实用眼科杂志 2016年第6期34卷 610-611页

作者：曹文捷上海市嘉定区南翔医院眼科上海市201802

目的探讨对口医疗支援活动中白内障超声乳化的手术体会与治疗效果。方法对2014。2015年连续2年在青海久治县对口支援医疗活动中开展筛查的白内障患者共51只眼施行超声乳化摘出及人工晶状体植入术。结果术后第1d，裸眼视力0．1-0．25者3... 详细信息

目的探讨对口医疗支援活动中白内障超声乳化的手术体会与治疗效果。方法对2014。2015年连续2年在青海久治县对口支援医疗活动中开展筛查的白内障患者共51只眼施行超声乳化摘出及人工晶状体植入术。结果术后第1d，裸眼视力0．1-0．25者3只跟（5．89％，3／51）；0．3-0．5者25只眼（49．01％，25／51）；0．6及以上者23只眼（45．09％，23／51）。术眼脱盲率：100％（20／20）。术眼脱残率：94．1％（48／51）。结论设备器材、人员的精心准备，手术指征的把握及术者的手术熟练程度是成功开展的重要因素。

关键词：医疗支援超声乳化术人工晶状体