期刊文献+
共找到470篇文章
< 1 2 24 >
每页显示 20 50 100
Defect Detection in Printed Circuit Boards with Pre-Trained Feature Extraction Methodology with Convolution Neural Networks
1
作者 Mohammed A.Alghassab 《Computers, Materials & Continua》 SCIE EI 2022年第1期637-652,共16页
Printed Circuit Boards(PCBs)are very important for proper functioning of any electronic device.PCBs are installed in almost all the electronic device and their functionality is dependent on the perfection of PCBs.If P... Printed Circuit Boards(PCBs)are very important for proper functioning of any electronic device.PCBs are installed in almost all the electronic device and their functionality is dependent on the perfection of PCBs.If PCBs do not function properly then the whole electric machine might fail.So,keeping this in mind researchers are working in this field to develop error free PCBs.Initially these PCBs were examined by the human beings manually,but the human error did not give good results as sometime defected PCBs were categorized as non-defective.So,researchers and experts transformed this manual traditional examination to automated systems.Further to this research image processing and computer vision came into actions where the computer vision experts applied image processing techniques to extract the defects.But,this also did not yield good results.So,to further explore this area Machine Learning and Artificial Intelligence Techniques were applied.In this studywe have appliedDeep Neural Networks to detect the defects in the PCBS.PretrainedVGG16and Inception networkswere applied to extract the relevant features.DeepPCB dataset was used in this study,it has 1500 pairs of both defected and non-defected images.Image pre-processing and data augmentation techniques were applied to increase the training set.Convolution neural networks were applied to classify the test data.The results were compared with state-of-the art technique and it proved that the proposed methodology outperformed it.Performance evaluation metrics were applied to evaluate the proposed methodology.Precision 94.11%,Recall 89.23%,F-Measure 91.91%,and Accuracy 92.67%. 展开更多
关键词 Printed circuit board convolution neural network INCEPTION vgg16 data augmentation
下载PDF
OTN光传送网DVB-ASI信号接口板卡国产化应用与优化研究
2
作者 肖晓初 《广播与电视技术》 2024年第6期82-87,共6页
本文主要介绍在OTN光传送网中直接接入传输DVB-ASI信号的工作原理,针对DVB-ASI信号接口板卡在实际应用中所遇到的问题进行分析与研究,以及如何对DVB-ASI信号接口板卡的性能进行优化。本次优化工作实现了DVB-ASI信号直接在OTN光传送网更... 本文主要介绍在OTN光传送网中直接接入传输DVB-ASI信号的工作原理,针对DVB-ASI信号接口板卡在实际应用中所遇到的问题进行分析与研究,以及如何对DVB-ASI信号接口板卡的性能进行优化。本次优化工作实现了DVB-ASI信号直接在OTN光传送网更高质量传输适配的目标,在提高广播电视传输系统集约化水平和有效降低系统成本的基础上,减少了对国外技术的依赖,增强了相关技术的自主可控能力。 展开更多
关键词 OTN光传送网 DVB-ASI信号接口板卡 性能优化
下载PDF
基于BERT-CNN的城轨列控车载设备故障分类 被引量:1
3
作者 徐倩 张雷 +1 位作者 欧冬秀 贺云鹏 《深圳大学学报(理工版)》 CAS CSCD 北大核心 2023年第5期529-538,共10页
针对基于通信的城市轨道交通列车控制系统车载设备故障排查困难,故障维修日志由于信息零散、语义模糊及归类混乱等导致的传统文本分布式表示与浅层机器学习算法分类精度低等问题,提出一种基于焦点损失函数BERT-CNN(bidirectional encode... 针对基于通信的城市轨道交通列车控制系统车载设备故障排查困难,故障维修日志由于信息零散、语义模糊及归类混乱等导致的传统文本分布式表示与浅层机器学习算法分类精度低等问题,提出一种基于焦点损失函数BERT-CNN(bidirectional encoder representations from transformers-convolutional neural network)的故障分类方法,建立故障处理及结论、故障现象的关系模型.利用预训练好的BERT模型微调获取故障现象的词向量,充分捕捉融合了上下文的双向语义并关注重点词汇;利用卷积神经网络(convolutional neural network,CNN)进行训练,改进损失函数以缓解数据类别不平衡引起的性能下降问题.通过对某车载信号工区数据进行实验,对比基于交叉熵损失函数的BERT-CNN、单一BERT模型与word2vec-CNN(word to vector-CNN)方法,基于焦点损失函数BERT-CNN方法在分类指标上最优,对某些样本数量少的类别能够更精准分类.研究结果有助于建立更完善的智能运维故障案例库. 展开更多
关键词 交通运输工程 城轨列控车载设备 BERT语言模型 卷积神经网络 故障分类 类别不平衡
下载PDF
Monitoring subsidence rates along road network by persistent scatterer SAR interferometry with high-resolution TerraSAR-X imagery 被引量:5
4
作者 Bing Yu Guoxiang Liu +5 位作者 Rui Zhang Hongguo Jia Tao Li Xiaowen Wang Keren Dai Deying Ma 《Journal of Modern Transportation》 2013年第4期236-246,共11页
Ground subsidence is one of the key factors damaging transportation facilities, e.g., road networks consisting of highways and railways. In this paper, we propose to apply the persistent scatterer synthetic aperture r... Ground subsidence is one of the key factors damaging transportation facilities, e.g., road networks consisting of highways and railways. In this paper, we propose to apply the persistent scatterer synthetic aperture radar interferometry (PS-InSAR) approach that uses high- resolution TerraSAR-X (TSX) imagery to extract the regional scale subsidence rates (i.e., average annual sub- sidence in mm/year) along road networks. The primary procedures involve interferometric pair selection, interfer- ogram generation, persistent scatterer (PS) detection, PS networking, phase parameterization, and subsidence rate estimation. The Xiqing District in southwest Tianjin (China) is selected as the study area. This district contains one railway line and several highway lines. A total of 15 TSX images covering this area between April 2009 and June 2010 are utilized to obtain the subsidence rates by using the PS-InSAR (PSI) approach. The subsidence rates derived from PSI range from -68.7 to -1.3 mm/year. These findings show a significantly uneven subsidence pattern along the road network. Comparison between the PSI-derived subsidence rates and the leveling data obtained along the highways shows that the mean and standard deviation (SD) of the discrepancies between the two types of subsidence rates are 0.1 and 4-3.2 mm/year, respectively. The results indicate that the high-resolution TSX PSI is capable of providing comprehensive and detailed subsidence information regarding road networks with millimeter-level accuracy. Further inspections under geo- logical conditions and land-use categories in the study area indicate that the observed subsidence is highly related to aquifer compression due to groundwater pumping. Therefore, measures should be taken to mitigate groundwater extraction for the study area. 展开更多
关键词 SUBSIDENCE Road network - Persistent scatterer interferometry TERRASAR-X HIGHWAY RAILWAY
下载PDF
Prediction of flow stress of Ti-15-3 alloy with artificial neural network 被引量:2
5
作者 李萍 单德彬 +2 位作者 薛克敏 吕炎 许沂 《中国有色金属学会会刊:英文版》 CSCD 2001年第1期95-97,共3页
Hot compression experiments were conducted on Ti 15 3 alloy specimens using Gleeble 1500 Thermal Simulator.These tests were focused to obtain the flow stress data under various conditions of strain,strain rate and tem... Hot compression experiments were conducted on Ti 15 3 alloy specimens using Gleeble 1500 Thermal Simulator.These tests were focused to obtain the flow stress data under various conditions of strain,strain rate and temperature. On the basis of these data, the predicting model for the nonlinear relation between flow stress and deformation strain,strain rate and temperature for Ti 15 3 alloy was developed with a back propagation artificial neural network method. Results show that the neural network can reproduce the flow stress in the sampled data and predict the nonsampled data well. Thus the neural network method has been verified to be used to tackle hot deformation problems of Ti 15 3 alloy. [ 展开更多
关键词 artificial NEURAL network Ti-15-3 ALLOY flow STRESS
下载PDF
Cognitive amplify-and-forward dual-hop relay networks over α-μ fading channels 被引量:2
6
作者 HAN Yan-bo GAO Li YAN Wen-hua 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2019年第1期69-75,共7页
This paper provides an analytic performance evaluation of dual-hop cognitive amplify-and-forward (AF) relaying networks over independent nonidentically distributed (i.n.i.d.) fading channels. Two different transmit po... This paper provides an analytic performance evaluation of dual-hop cognitive amplify-and-forward (AF) relaying networks over independent nonidentically distributed (i.n.i.d.) fading channels. Two different transmit power constraint strategies at the secondary network are proposed to investigate the performance of the secondary network. In the case of combined power constraint,the maximum tolerable interference power on the primary network and the maximum transmit power at the secondary network are considered. Closed-form lower bound and its asymptotic expression for the outage probability (OP) are achieved. Utilizing the above results,average symbol error probability (ABEP) at high signal-to-noise ratios (SNRs) are also derived. In order to further study the performance of dual-hop cognitive AF relaying networks,the Closed-form lower bounds and asymptotic expressions for OP with single power constraint of the tolerable interference on the primary network is also obtained. Both analytical and simulation are employed to validate the accuracy of the theoretical analysis. The results show that the secondary network obtains a better performance when higher power constraint is employed. 展开更多
关键词 cognitive relay network amplify-and-forward relay outage probability α-μ fading channels
下载PDF
A new algorithm for wireless sensor network based on NS-2 被引量:2
7
作者 焦国太 孟庆丰 《Journal of Measurement Science and Instrumentation》 CAS 2013年第3期272-275,共4页
Considering wireless sensor network characteristics,this paper uses network simulator,version2(NS-2)algorithm to improve Ad hoc on-demand distance vector(AODV)routing algorithm,so that it can be applied to wireless se... Considering wireless sensor network characteristics,this paper uses network simulator,version2(NS-2)algorithm to improve Ad hoc on-demand distance vector(AODV)routing algorithm,so that it can be applied to wireless sensor networks.After studying AODV routing protocol,a new algorithm called Must is brought up.This paper introduces the background and algorithm theory of Must,and discusses the details about how to implement Must algorithm.At last,using network simulator(NS-2),the performance of Must is evaluated and compared with that of AODV.Simulation results show that the network using Must algorithm has perfect performance. 展开更多
关键词 wireless sensor networks routing protocol network simulator version 2 (NS-2) Must algorithmCLC number:TN926 Document code:AArticle ID:1674-8042(2013)03-0272-04
下载PDF
Chaotic Neural Network Technique for "0-1" Programming Problems 被引量:1
8
作者 王秀宏 乔清理 王正欧 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2003年第4期99-105,共7页
0-1 programming is a special case of the integer programming, which is commonly encountered in many optimization problems. Neural network and its general energy function are presented for 0-1 optimization problem. The... 0-1 programming is a special case of the integer programming, which is commonly encountered in many optimization problems. Neural network and its general energy function are presented for 0-1 optimization problem. Then, the 0-1 optimization problems are solved by a neural network model with transient chaotic dynamics (TCNN). Numerical simulations of two typical 0-1 optimization problems show that TCNN can overcome HNN's main drawbacks that it suffers from the local minimum and can search for the global optimal solutions in to solveing 0-1 optimization problems. 展开更多
关键词 neural network chaotic dynamics 0-1 optimization problem.
下载PDF
基于CNN-ADABOOST的车载设备故障诊断 被引量:1
9
作者 宋鹏飞 陈永刚 王海涌 《重庆邮电大学学报(自然科学版)》 CSCD 北大核心 2023年第6期1174-1182,共9页
列控车载设备故障量大,其诊断依赖于专家经验且故障信息数据分布不平衡。以CTCS3-300T型列控车载设备中CTCS-3控制单元(ATPCU)记录的故障词条为样本,提出一种卷积神经网络(convolutional neural networks,CNN)与自适应增强(adaptive boo... 列控车载设备故障量大,其诊断依赖于专家经验且故障信息数据分布不平衡。以CTCS3-300T型列控车载设备中CTCS-3控制单元(ATPCU)记录的故障词条为样本,提出一种卷积神经网络(convolutional neural networks,CNN)与自适应增强(adaptive boosting,Adaboost)算法结合的车载设备故障诊断方法。考虑到列控车载日志为半结构化文本,采用skip-gram模型对故障词条进行处理生成词向量,通过CNN进行特征提取,将CNN作为基分类器,通过Adaboost更新样本权重与基分类器权重生成强分类器对分布不平衡的故障数据进行分类,实现列控车载设备的故障诊断。实验数据为某铁路局电务段原始车载日志,研究结果表明,基分类器迭代步数与数目是影响模型性能的关键因素,通过确定基分类器数目与单个基分类器训练步数,可显著提升模型对于不平衡数据样本的分类能力。研究成果为车载设备故障诊断提供了一种智能且有效的方法。 展开更多
关键词 车载设备 故障诊断 词向量 卷积神经网络 自适应增强算法
下载PDF
Editorial Board 2011-2015
10
《World Journal of Gastrointestinal Oncology》 SCIE CAS 2013年第10期6-9,共4页
The World Journal of Gastrointestinal Oncology Editorial Board consists of 428 members,representing a team of worldwide experts in gastrointestinal oncology.They are from 40 countries,including Argentina(2),Australia(... The World Journal of Gastrointestinal Oncology Editorial Board consists of 428 members,representing a team of worldwide experts in gastrointestinal oncology.They are from 40 countries,including Argentina(2),Australia(10),Belgium(5),Brazil(2),Canada(4),Chile(2),China(56),Czech Republic(1),Denmark(1),Finland(3),France(7),Germany(24),Greece(13),Hungary(2),India(9),Iran(2),Ireland(2),Israel(4),Italy(41),Japan(47)。 展开更多
关键词 WANG CHEN Editorial board 2011-2015 LONG DE
下载PDF
Editorial Board 2011-2015
11
《World Journal of Gastrointestinal Oncology》 SCIE CAS 2013年第9期180-183,共4页
The World Journal of Gastrointestinal Oncology Editorial Board consists of 428 members,representing a team of worldwide experts in gastrointestinal oncology.They are from 40 countries,including Argentina(2),Australia(... The World Journal of Gastrointestinal Oncology Editorial Board consists of 428 members,representing a team of worldwide experts in gastrointestinal oncology.They are from 40 countries,including Argentina(2),Australia(10),Belgium(5),Brazil(2),Canada(4),Chile(2),China(56),Czech Republic(1),Denmark(1),Finland(3),France(7),Germany(24),Greece(13),Hungary(2),India(9),Iran(2),Ireland(2),Israel(4),Italy(41),Japan(47),Kuwait(2),Mexico(1),Netherlands(7),New Zealand(2),Norway(1),Poland(3),Portugal(5),Romania(1),Saudi Arabia(1),Serbia(2),Singapore(4),South Korea(27),Spain(10),Sweden(5),Switzerland(2),Syria(1),Thailand(1),Turkey(6),United Kingdom(15),and United States(95). 展开更多
关键词 WANG CHEN Editorial board 2011-2015 LONG DE
下载PDF
Editorial Board 2009-2013
12
《World Journal of Gastrointestinal Oncology》 SCIE CAS 2011年第12期189-191,共3页
The World Journal of Gastrointestinal Oncology Editorial Board consists of 404 members,representing a team of worldwide experts in gastrointestinal oncology.They are from 41 countries,including Argentina(1),Australia(9),
关键词 WANG ZHANG LI CHEN Editorial board 2009-2013 LONG
下载PDF
Editorial Board 2011-2015
13
《World Journal of Gastrointestinal Oncology》 SCIE CAS 2014年第2期28-31,共4页
The World Journal of Gastrointestinal Oncology Editorial Board consists of 428 members,representing a team of worldwide experts in gastrointestinal oncology.They are from 40 countries,including Argentina(2),Australia(... The World Journal of Gastrointestinal Oncology Editorial Board consists of 428 members,representing a team of worldwide experts in gastrointestinal oncology.They are from 40 countries,including Argentina(2),Australia(10),Belgium(5),Brazil(2),Canada(4),Chile(2),China(56),Czech Republic(1),Denmark(1),Finland(3)。 展开更多
关键词 WANG LA LI CHEN Editorial board 2011-2015 LONG DE
下载PDF
Editorial Board 2010-2015
14
《World Journal of Diabetes》 SCIE CAS 2011年第12期228-230,共3页
The World Journal of Diabetes Editorial Board consists of 323 members, representing a team of worldwide experts in diabetes mellitus. They are from 38 countries, including Argentina (1), Australia (13), Austria (6), B... The World Journal of Diabetes Editorial Board consists of 323 members, representing a team of worldwide experts in diabetes mellitus. They are from 38 countries, including Argentina (1), Australia (13), Austria (6), Belgium (1), Brazil (3), Canada (14), China (21), Czech Republic (3), Denmark (9), Egypt (2), Finland (3), France (5), Germany (17), Greece (10), Hungary (2), India (10), Ireland (2), Iran (2), Israel (5), Italy (25) 展开更多
关键词 2010 CHEN HO LI Editorial board 2010-2015 World
下载PDF
Editorial Board 2014-2017
15
《World Journal of Radiology》 CAS 2014年第3期1-3,共3页
The World Journal of Radiology Editorial Board consists of 365 members,representing a team of worldwide experts in radiology.They are from 36 countries,including Afghanistan(1),Argentina(2),Australia(5),Austria(7),Bel... The World Journal of Radiology Editorial Board consists of 365 members,representing a team of worldwide experts in radiology.They are from 36 countries,including Afghanistan(1),Argentina(2),Australia(5),Austria(7),Belgium(2),Brazil(8),Canada(6),Chile(1),China(43),Croatia(1),Denmark(4),Egypt(6),France(5),Germany(22)。 展开更多
关键词 DE LI CHEN WANG Editorial board 2014-2017 ZHANG LONG
下载PDF
Editorial Board 2011-2015
16
《World Journal of Diabetes》 SCIE CAS 2013年第4期167-171,共5页
The World Journal of Diabetes Editorial Board now consists of 713 members,representing a team of worldwide experts in diabetes mellitus.They are from 56 countries,including Argentina(2),Australia(27),Austria(11),
关键词 WANG St HO FORT Editorial board 2011-2015 CHEN JUN LA
下载PDF
Editorial Board 2010-2015
17
《World Journal of Diabetes》 SCIE CAS 2010年第3期108-110,共3页
The World Journal of Diabetes Editorial Board consists of 323 members, representing a team of worldwide experts in diabetes mellitus. They are from 38 countries, including Argentina (1), Australia (13), Austria (6), B... The World Journal of Diabetes Editorial Board consists of 323 members, representing a team of worldwide experts in diabetes mellitus. They are from 38 countries, including Argentina (1), Australia (13), Austria (6), Belgium (1), 展开更多
关键词 2010 Editorial board 2010-2015 World
下载PDF
Editorial Board 2009-2013
18
《World Journal of Radiology》 CAS 2013年第12期445-447,共3页
The World Journal of Radiology Editorial Board consists of 319 members,representing a team of worldwide experts in radiology.They are from 40 countries,including Australia(3),Austria(4),Belgium(5),Brazil(3),Canada(9),... The World Journal of Radiology Editorial Board consists of 319 members,representing a team of worldwide experts in radiology.They are from 40 countries,including Australia(3),Austria(4),Belgium(5),Brazil(3),Canada(9),Chile(1),China(25),Czech(1),Denmark(1),Egypt(4),Estonia(1),Finland(1),France(6),Germany(17),Greece(8),Hungary(1),India(9),Iran(5),Ireland(1),Israel(4),Italy(28),Japan(14),Lebanon(1),Libya(1),Malaysia(2), 展开更多
关键词 WANG St CHEN Editorial board 2009-2013
下载PDF
Design of Distributed Fault-Tolerant Industrial Network
19
作者 路林吉 邵志南 《Journal of China Textile University(English Edition)》 EI CAS 2000年第1期96-99,共4页
A token-bus-based design method of the distributedfault-tolerant industrial network is presented in this pa-per.The dual-link network is of hot-redundancy.The performance of the network is also discussed.
关键词 FAULT - TOLERANCE REDUNDANCY network diag-nosis network reconfiguration.
下载PDF
World Journal of Gastroenterology~ Brief Introduction of Editorial Board 2004-2006
20
《World Journal of Gastroenterology》 SCIE CAS CSCD 2006年第1期164-180,共17页
The World Journal of Gastroenterology Editorial Board consists of 685members,representing a team of worldwide experts in gastroenterologyand hepatology.They are from 52 countries including:Albania(1),Argentina(1),Aust... The World Journal of Gastroenterology Editorial Board consists of 685members,representing a team of worldwide experts in gastroenterologyand hepatology.They are from 52 countries including:Albania(1),Argentina(1),Australia(16).Austria(7),Belarus(1),Belgium(11),Brazil(1),Bulgaria(1),Canada(10),China(58),Croatia(2),Czech(1),Denmark(5),Egypt(3),Finland(1),France(27).Germany(71),Greece(1),Hungary(1).Iceland(1),India(6),Iran(2),Ireland(2),Israel(5),Italy(51),Japan(137),Lebanon(2),Lithuania(1),Macedonia(1),Malaysia(3),Mexico(2),Monaco(1),Netherlands(15),New Zealand(1),Nigeria(1),Norway(2),Pakistan(1),Poland(6),Portugal(1),Russia(3),Singapore(3),Slovakia(1),South Africa(1),South Korea(9),Spain(27),Sweden(6),Switzerland(8),Turkey(7),United Arab Emirates(1),United Kingdom(37).United States(121),Yugoslavia(1). 展开更多
关键词 HO MD Brief Introduction of Editorial board 2004-2006 World Journal of Gastroenterology
下载PDF
上一页 1 2 24 下一页 到第
使用帮助 返回顶部