检索结果-南通市图书馆

基于多尺度知识蒸馏与增量学习的滚动轴承故障诊断方法

在线全文

学校读者我要写书评

暂无评论

振动与冲击 2024年第12期43卷 276-285页

作者：夏逸飞皋军邵星王翠香盐城工学院信息工程学院江苏盐城224000 盐城工学院机械工程学院江苏盐城224000

为了缓解单任务轴承故障诊断方法在不同工况诊断时产生的灾难性遗忘问题,提出一种基于多尺度知识蒸馏与增量学习(multi-scale knowledge distillation and continual learning,CL-MSKD)的滚动轴承故障诊断方法。以一维卷积神经网络作为C... 详细信息

为了缓解单任务轴承故障诊断方法在不同工况诊断时产生的灾难性遗忘问题,提出一种基于多尺度知识蒸馏与增量学习(multi-scale knowledge distillation and continual learning,CL-MSKD)的滚动轴承故障诊断方法。以一维卷积神经网络作为CL-MSKD主要框架,余弦归一化层作为多任务共享的分类器,通过标签与特征两个尺度的知识蒸馏实现模型知识的保存与传递。CL-MSKD能够以一个统一结构的网络模型对在不同工况下的轴承故障进行诊断,通过知识压缩方法不断地学习和保存知识,最终缓解增量阶段产生的灾难性遗忘问题,提升跨工况场景下轴承故障诊断性能。试验表明,CL-MSKD能够有效缓解灾难性遗忘并保持良好的诊断效果。在任务环境差异较大的情况下,准确率指标仍能达到97.09%,与其他增量方法相比稳定性更好,精度更高。

关键词：增量学习知识蒸馏卷积神经网络轴承故障诊断共享分类器

Influence of sea-land breeze on the formation and dissipation of severe dense fog and its burst reinforcement in the Yellow Sea coastal area,China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第2期67卷 432-449页

作者： Ya GAO Duanyang LIU Shuqi YAN Wenjun ZHOU Hongbin WANG Fan ZU Qin MEI Chuanxiang YI Ye SHENG Key Laboratory of Transportation Meteorology of China Meteorological Administration Nanjing210041China Yancheng Meteorological Bureau Yancheng224000China Nanjing Joint Institute for Atmospheric Sciences Nanjing210041China Key Laboratory of Disaster Weather Chinese Academy of Meteorological SciencesBeijing100086China

Based on the global reanalysis data of the National Centers for Environmental Prediction(NCEP)/National Center for Atmospheric Research,the surface meteorological observation data,sounding data and satellite observation data,this paper comprehensively analyzes the evolution process and formation mechanism of a persistent severe dense fog process occurred on February 15–17,2015 in Yancheng,eastern *** the numerical simulation experiment of Weather Research and Forecast(WRF)model,we further analyze the impact of sea-land breeze on the formation and burst reinforcement of *** show that the precipitation caused by the southwesterly airflow in front of the upper-level trough and the low-pressure inverted trough are conducive to the formation of early rain fog,while the nighttime clear radiance under the control of surface cold high and the infiltration of weak cold advection are conducive to the formation and development of later radiation-advection *** WRF model simulates the fog evolution process,which is basically consistent with the actual fog area,and the simulation results are credible to a certain *** simulation results show that the establishment of sea breeze has an advection cooling effect on the near surface layer,which is conducive to the formation and development of the inversion layer on the near surface,providing stable stratification conditions for the formation and burst reinforcement of *** one hand,the strengthening of sea breeze circulation can continuously transport water vapor to the study *** the other,the occurrence of ultra-low level jet is favorable for the accumulation of low-level water *** the same time,the inversion intensity further strengthens,which is in favor of the burst reinforcement and long-term maintenance of fog.

关键词： Radiation-advection fog Sea-land breeze Atmospheric boundary layer Fog burst reinforcement WRF model

长三角地区交通一体化的多尺度分析及空间效应

在线全文

学校读者我要写书评

暂无评论

经济地理 2024年第1期44卷 99-106页

作者：王亮蒋海兵刘丙章盐城师范学院城市与规划学院江苏盐城224000

从区域时空压缩的角度出发,通过构建综合交通可达性模型,测度长三角地区41个地级及以上城市间最短时间距离及其变化,利用德尔菲法和等时圈分析法等方法,从城市、都市圈、城市群3个尺度探讨长三角地区一体化水平的空间异质性,为长三角地... 详细信息

从区域时空压缩的角度出发,通过构建综合交通可达性模型,测度长三角地区41个地级及以上城市间最短时间距离及其变化,利用德尔菲法和等时圈分析法等方法,从城市、都市圈、城市群3个尺度探讨长三角地区一体化水平的空间异质性,为长三角地区一体化方案制订及实施提供参考依据。研究发现:(1)在交通一体化建设背景下,高铁和城际铁路的建设和开通使得城市之间的时间距离大幅度缩短,城际社会经济交流更加密切,区域内1 h以内的城市对数量急剧增多;(2)区域高水平一体化地区集中分布于沪宁和沪杭等轴带地区,长江经济带沿线城市一体化水平较高;(3)在时空压缩效应下,区域中心城市扩大了“溢出效应”和“同城效应”的地域范围;(4)长三角地区一体化空间异质性随着高速交通网络不断完善而发生改变,杭州、无锡、苏州、合肥等城市逐渐成为长三角地区新兴核心城市,芜湖、安庆等城市在城市网络中的作用也在逐渐加强。

关键词：长三角城市群交通一体化高铁等时圈都市圈城市群

融合改进YOLOv5及Mediapipe的手势识别研究

在线全文

学校读者我要写书评

暂无评论

计算机工程与应用 2024年第7期60卷 108-118页

作者：倪广兴徐华王超盐城工学院信息工程学院江苏盐城224000 盐城师范学院物理与电子工程学院江苏盐城224000

针对现有手势识别算法计算量大、鲁棒性差等问题,提出一种基于IYOLOv5-Med(improved YOLOv5 Mediapipe)算法的手势识别方法。该算法将改进的YOLOv5算法和Mediapipe方法结合,包括手势检测和手势分析两部分,算法有效降低了训练的时间成本... 详细信息

针对现有手势识别算法计算量大、鲁棒性差等问题,提出一种基于IYOLOv5-Med(improved YOLOv5 Mediapipe)算法的手势识别方法。该算法将改进的YOLOv5算法和Mediapipe方法结合,包括手势检测和手势分析两部分,算法有效降低了训练的时间成本,增加了识别的鲁棒性。手势检测部分,改进了传统YOLOv5算法,利用FastNet重构C3模块,将CBS模块替换为GhostNet中GhostConv模块,在Backbone网络末端加入SE注意力机制模块,改进后的算法,模型体积更小,更适用于资源有限的边缘设备。手势分析部分,提出了一种基于Mediapipe的方法,对手势检测部分定位到的手势区域进行手部关键点检测,并提取相关特征,然后通过朴素贝叶斯分类器进行识别。实验结果证实了提出的IYOLOv5-Med算法的有效性,与传统YOLOv5算法相比,参数量下降34.5%,计算量减少34.9%,模型权重降低33.2%,最终平均识别率达到0.997,且实现方法相对简单,有较好的应用前景。

关键词：手势识别 YOLOv5 Mediapipe FastNet 注意力机制

Surveillance Report of the Prevalence and Risk Factors of Chronic Non-Communicable Diseases in Tinghu District,Yancheng City,2021

在线全文

学校读者我要写书评

暂无评论

Proceedings of Anticancer Research 2024年第4期8卷 135-141页

作者： Lili Yan Zhiqin Kai Center for Disease Control and Prevention Tinghu DistrictYancheng CityJiangsu Province 224000China

Objective:To comprehensively understand the changes and prevalence of major chronic diseases among residents of Tinghu District,Yancheng City,in 2021,and to analyze the trends of the major risk factors for the onset of chronic diseases in the ***:Chronic diseases and their risk factors in Tinghu District in 2021 were monitored among the resident population who had lived in the district for five years or more and were aged 18 years or *** survey was conducted using random cluster sampling,with 7,130 questionnaires *** data processing,7,012 valid questionnaires were obtained,resulting in a qualification rate of 98.35%.Results:Among the chronic diseases reported in the survey population,hypertension had the highest prevalence at 37.61%,followed by dyslipidemia at 37.19%.Other chronic diseases were ranked in order of prevalence from highest to *** of gender,the top three chronic diseases were hypertension,diabetes,and *** regression analysis identified both non-preventable risk factors(such as family history,gender,and age)and preventable risk factors(such as smoking,sedentary behavior,overweight,and obesity)as significant contributors to the major chronic diseases in Tinghu ***:Analyzing the trends in the main risk factors for chronic disease incidence in Tinghu District,Yancheng City,provides a basis for developing a new comprehensive chronic disease prevention and control plan to address chronic disease prevention and management.

关键词： Chronic diseases Non-communicable Social factors Monitoring report

Chaotic Map-Based Authentication and Key Agreement Protocol with Low-Latency for Metasystem

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第3期78卷 4471-4488页

作者： Guojun Wang Qi Liu School of Electronics&Information Engineering Nanjing University of Information Science&TechnologyNanjing210044China Yancheng Polytechnic College Yancheng224000China Jiangsu Province Engineering Research Center of Advanced Computing and Intelligent Services School of SoftwareNanjing University of Information Science and TechnologyNanjingChina

With the rapid advancement in exploring perceptual interactions and digital twins,metaverse technology has emerged to transcend the constraints of space-time and reality,facilitating remote AI-based *** this dynamic metasystem environment,frequent information exchanges necessitate robust security measures,with Authentication and Key Agreement(AKA)serving as the primary line of defense to ensure communication ***,traditional AKA protocols fall short in meeting the low-latency requirements essential for synchronous interactions within the *** address this challenge and enable nearly latency-free interactions,a novel low-latency AKA protocol based on chaotic maps is *** protocol not only ensures mutual authentication of entities within the metasystem but also generates secure session *** security of these session keys is rigorously validated through formal proofs,formal verification,and informal *** confronted with the Dolev-Yao(DY)threat model,the session keys are formally demonstrated to be secure under the Real-or-Random(ROR)*** proposed protocol is further validated through simulations conducted using VMware workstation compiled in HLPSL language and C *** simulation results affirm the protocol’s effectiveness in resisting well-known attacks while achieving the desired low latency for optimal metaverse interactions.

关键词： Metasystem authentication and key agreement chaotic map secure communication

An aqueous rechargeable Fe//LiMn_(2)O_()hybrid battery with superior electrochemical performance beyond mainstream Fe-based batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第6期17卷 5168-5178页

作者： Yu Liu Dehui Xie Yuxin Shi Rongguan Lv Yingna Chang Yuzhen Sun Zhiyuan Zhao Jindi Wang Kefan Song Huayu Wu Tuan K.A.Hoang Rong Xing Huan Pang Institute of New Energy on Chemical Storage and Power Sources School of Chemical and Environmental EngineeringYancheng Teachers UniversityYancheng 224000China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Department of Chemical Engineering University of Waterloo200 University Avenue WestWaterlooOntario N2L 3G1Canada

Aqueous rechargeable batteries(ARBs)are generally safer than non-aqueous analogues,they are also less-expensive,and more friendly to the ***,the inherent disadvantage of the narrow electrochemical window of H2O seriously restricts the energy density and output voltage of ARBs,especially aqueous rechargeable Fe-based ***,we introduce a new battery system:the anode contains C@Fe/Fe_(2)O_(3)composite,which is interfaced with an alkaline electrolyte;the cathode contains LiMn_(2)O_()in contact with a neutral electrolyte.A Li^(+)-conducting membrane is carefully selected to decouple the electrode-electrolyte,which effectively widens the electrochemical window to above 2.65 V,thereby enables an aqueous rechargeable iron *** average output voltage is 1.83 V and its energy density is 235.3 Wh/kg at 549 W/*** this work,we propose the energy storage mechanism with the aid of density functional theory(DFT).The calculated reduction potential of the anode agrees with the experimental ***,this battery system demonstrates long cycle lifespan of approximately 2500 cycles at 2 A/g,corresponding to a capacity retention of 82.1%.These results are very far superior than those of mainstream aqueous rechargeable Fe-based batteries,which guarantee future investigation for storing electricity energy.

关键词： aqueous battery high voltage high energy iron oxide theoretical calculation

紫锥菊颗粒对海兰褐蛋雏鸡生长性能、器官指数和血清生化指标的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

饲料研究 2024年第11期47卷 61-65页

作者：代二朋朱根生姚竹青赖芳纪春暖光明食品集团上海农场有限公司江苏盐城224000 上海农场江苏正阳禽业有限公司江苏盐城224000

试验旨在探究饲粮中添加紫锥菊颗粒对海兰褐蛋雏鸡生长性能、器官指数和血清生化指标的影响。选取体重相近、健康的16日龄海兰褐蛋雏鸡153只,随机分成3组,每组3个重复,每个重复17只雏鸡。对照组饲喂基础饲粮,试验1组和试验2组分别在基... 详细信息

试验旨在探究饲粮中添加紫锥菊颗粒对海兰褐蛋雏鸡生长性能、器官指数和血清生化指标的影响。选取体重相近、健康的16日龄海兰褐蛋雏鸡153只,随机分成3组,每组3个重复,每个重复17只雏鸡。对照组饲喂基础饲粮,试验1组和试验2组分别在基础饲粮中添加1 g/kg和2 g/kg的紫锥菊颗粒,连续服用14 d。结果显示:与对照组相比,试验2组的平均日增重提高了1.6%,平均日采食量降低了1.1%,料重比降低了2.7%。与对照组相比,试验2组的胸腺重显著升高(P<0.05)。与对照组相比,试验1组、试验2组的心脏指数分别提高了4.35%和0.62%,法氏囊指数分别提高了5.00%和12.89%,胸腺指数显著升高(P<0.05)。与对照组相比,试验2组的血清球蛋白(GLB)、总蛋白(TP)和葡萄糖(GLU)含量显著升高(P<0.05),甘油三酯(TG)含量显著降低(P<0.05)。研究表明,饲粮中添加紫锥菊颗粒能够提高海兰褐蛋雏鸡的生长性能和器官指数,改善血清生化指标,从而进一步提高免疫功能,2 g/kg的添加效果最佳。

关键词：紫锥菊颗粒蛋雏鸡生长性能器官发育器官指数血清生化指标

维普期刊数据库博看期刊

Research on Interpolation Method for Missing Electricity Consumption Data

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第2期78卷 2575-2591页

作者： Junde Chen Jiajia Yuan Weirong Chen Adnan Zeb Md Suzauddola Yaser A.Nanehkaran Department of Electronic Commerce Xiangtan UniversityXiangtan411105China School of Information Engineering Yancheng Teachers UniversityYancheng224000China Department of Information and Electrical Engineering Ningde Normal UniversityNingde352100China College of Engineering Southern University of Science and TechnologyShenzhen518005China School of Informatics Xiamen UniversityXiamen361005China

Missing value is one of the main factors that cause dirty *** high-quality data,there will be no reliable analysis results and precise ***,the data warehouse needs to integrate high-quality data *** the power system,the electricity consumption data of some large users cannot be normally collected resulting in missing data,which affects the calculation of power supply and eventually leads to a large error in the daily power line loss *** the problem of missing electricity consumption data,this study proposes a group method of data handling(GMDH)based data interpolation method in distribution power networks and applies it in the analysis of actually collected electricity ***,the dependent and independent variables are defined from the original data,and the upper and lower limits of missing values are determined according to prior knowledge or existing data *** missing data are randomly interpolated within the upper and lower ***,the GMDH network is established to obtain the optimal complexity model,which is used to predict the missing data to replace the last imputed electricity consumption *** last,this process is implemented iteratively until the missing values do not *** a relatively small noise level(α=0.25),the proposed approach achieves a maximum error of no more than 0.605%.Experimental findings demonstrate the efficacy and feasibility of the proposed approach,which realizes the transformation from incomplete data to complete ***,this proposed data interpolation approach provides a strong basis for the electricity theft diagnosis and metering fault analysis of electricity enterprises.

关键词： Data interpolation GMDH electricity consumption data distribution system