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2021 IEEE 4th Advanced Information Management, Communicates, Electronic and Automation Control Conference (IMCEC)最新文献

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The Impact of Harmonic Generated by Distributed Photovoltaic Grid-connected Power Generation System 分布式光伏并网发电系统产生谐波的影响
Xiaomeng Wu, Zexuan Li
Since the industrial revolution, the application of traditional petrochemical energy has brought a lot of pollution and greenhouse effect to the global environment, and new energy technology, as one of the important ways to solve global environmental problems, has been widely recognized by all countries in the world, and its application has become more and more deep widely. As a majority of distributed photovoltaic projects are integrated into the distribution network to generate electricity, the impact on the distribution network and system stability has become increasingly prominent. Since distributed photovoltaic grid connection is the main form and development trend of photovoltaic power generation in the future, analyzing the impact of its harmonics on the distribution network is particularly important for maintaining the stable operation of the grid system.
自工业革命以来,传统石化能源的应用给全球环境带来了大量的污染和温室效应,而新能源技术作为解决全球环境问题的重要途径之一,得到了世界各国的广泛认可,其应用也越来越深入广泛。随着大部分分布式光伏项目并入配电网发电,对配电网和系统稳定性的影响日益突出。分布式光伏并网是未来光伏发电的主要形式和发展趋势,分析其谐波对配电网的影响对于维持电网系统的稳定运行尤为重要。
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引用次数: 0
Leaf Segmentation Algorithm Based on Improved U-shaped Network under Complex Background 复杂背景下基于改进u形网络的叶片分割算法
J. Kan, Zongyun Gu, Chun-Yue Ma, Qing Wang
In order to segment leaf image under complex background and improve the accuracy of leaf image segmentation, an image segmentation method based on improved U-shaped network is proposed. Based on the Pytorch deep learning framework, the U-shaped network model FPN is improved, the model adopts the encoder-decoder structure, ResNet50 is used as the trunk network, the encoder receives the image input, the feature extraction is accomplished by convolution, and the decoder uses the bilinear interpolation to complete the image reconstruction and outputs the segmentation results. In order to integrate the underlying position features and high-level semantic features better, the feature fusion module is introduced in the decoder. The experimental results show that the model has a significant effect in plant leaf segmentation, and the technical index is better than most traditional image segmentation algorithms.
为了对复杂背景下的叶片图像进行分割,提高叶片图像分割的精度,提出了一种基于改进u型网络的叶片图像分割方法。基于Pytorch深度学习框架,对u型网络模型FPN进行改进,该模型采用编码器-解码器结构,采用ResNet50作为主干网络,编码器接收图像输入,通过卷积完成特征提取,解码器使用双线性插值完成图像重构并输出分割结果。为了更好地整合底层位置特征和高层语义特征,在解码器中引入了特征融合模块。实验结果表明,该模型在植物叶片分割中效果显著,技术指标优于大多数传统图像分割算法。
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引用次数: 0
A High-performance Charge Pump for 40 nm Delay Locked Loops 一种用于40nm延迟锁相环的高性能电荷泵
Zhu Shi, Yanpeng Zhao, B. Yang, Fei Yin, Bin Wang, Wenping Liu
A highly current matched charge pump (CP) is proposed to improve the precision of the output clock for a delay-locked loop (DLL). The presented CP based on source-switched structure achieves good matching of charging and discharging currents over a broad dynamic range by introducing a novel rail-to-rail operational amplifier. The stable output voltage of the modified charge pump dramatically reduces the jitter of all output clocks in the locking state. Simulation results at a 1.2V supply voltage and a 40 nm COMS technology demonstrate the maximum mismatching ratio of charging and discharging currents decreases from 26.3% to 5.4% over the operating range of 0.2~1V. Furthermore, compared with the conventional charge pump, the maximum reduction magnitude of jitter for the related output clock is as much as 74.3% at the reference input clock of 1GHz.
为了提高延时锁相环输出时钟的精度,提出了一种高电流匹配电荷泵(CP)。该电路通过引入一种新型的轨对轨运算放大器,在较宽的动态范围内实现了良好的充放电电流匹配。改进后的电荷泵输出电压稳定,大大降低了锁相状态下所有输出时钟的抖动。在1.2V电压和40 nm COMS技术下的仿真结果表明,在0.2~1V工作范围内,充放电电流的最大失配率从26.3%降低到5.4%。此外,与传统电荷泵相比,在参考输入时钟为1GHz时,相关输出时钟的抖动最大减小幅度可达74.3%。
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引用次数: 1
Research on Road-Network Traversal of Fixed-Wing Multi-UAV in Urban Environment 城市环境下多架固定翼无人机路网穿越研究
Tianhe Lu, Li Liu
Road-network plays an important role in urban environment, so the reconnaissance along it should be attached much attention. However, the complexity of the road-network brings a lot of difficulties. In this paper, considering the constraints of road-network adjacent relationship and turn radius of fixed-wing UAV, we defined the problem model, including the road-network model with the description for different kinds of nodes. For road-network traversal problem, this paper proposed a method using improved depth-first search with angle constraint (DFS-AC) and genetic algorithm with double chromosome. The simulation results show that this method is able to solve road-network traversal problem both with and without infeasible nodes, at which fixed-wing UAV has no road to fly along.
路网在城市环境中起着重要的作用,因此对路网沿线的勘测工作应引起重视。然而,路网的复杂性带来了许多困难。考虑到路网相邻关系和固定翼无人机转弯半径的约束,定义了问题模型,包括路网模型和对不同类型节点的描述。针对路网遍历问题,提出了一种基于角度约束的改进深度优先搜索(DFS-AC)和双染色体遗传算法的方法。仿真结果表明,该方法能够解决固定翼无人机无路可飞的无可行节点和无不可行的路网穿越问题。
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引用次数: 0
Classification of rotor blade number of rotor targets micro-motion signal based on CNN 基于CNN的转子目标微运动信号的动叶数分类
Ming Long, Jun Yang, S. Xia, Xu Wei
In this paper, convolutional neural network (CNN) is used to classificate the rotor blade number of rotor targets micro-motion signal with deep learning’s strong feature extraction ability. Firstly, the scattering point model of the rotor blade echo is used to generate the target echo. Under the condition of different signal-to-noise ratio, time-frequency diagram of the echo with different number of rotor blades is constructed by using short-time Fourier transform, which is used as the test set and training set. Three convolutional neural network models of lenet, alexnet and vggnet are used for training. The performance of the network model is compared, and the recognition performance of the alexnet network model is analyzed under ambiguous, unambiguous and a method of Interpolation to resolve ambiguous. Through experiments, it can be found that the recognition rate of the proposed method can reach 95% under the condition of signal-to-noise ratio of 10dB. It has good recognition performance for classification of rotor blade number, and provides effective data and algorithm support for the rotor target recognition in the future.
本文利用深度学习强大的特征提取能力,利用卷积神经网络(CNN)对转子目标的转子叶片数微运动信号进行分类。首先,利用旋翼叶片回波散射点模型生成目标回波;在不同信噪比条件下,利用短时傅立叶变换构造了不同叶片数下的回波时频图,并将其作为测试集和训练集。使用lenet、alexnet和vggnet三种卷积神经网络模型进行训练。比较了网络模型的性能,分析了alexnet网络模型在模糊、无模糊和插值解决模糊的方法下的识别性能。通过实验可以发现,在信噪比为10dB的情况下,该方法的识别率可以达到95%。该方法对旋翼叶片数分类具有良好的识别性能,为今后的旋翼目标识别提供了有效的数据和算法支持。
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引用次数: 0
Electrocardiogram classification based on convolutional neural network and transfer learning 基于卷积神经网络和迁移学习的心电图分类
Jing Zhou, Aimei Dong
Deep learning is a branch of machine learning, and its methods are now being used to solve all kinds of problems. Deep learning algorithms can learn advanced features from massive data and automatically extract features, which makes deep learning surpass traditional machine learning algorithms. However, as deep learning algorithms rely on large amounts of data and run too slowly, transfer learning arises in response to this disadvantage. Transfer learning allows the use of existing knowledge in the relevant domain to solve a learning problem with only a small number of sample data in the target domain. Combining the two technologies of deep learning and transfer learning, on the one hand, advanced features of data samples can be automatically learned, and on the other hand, it can get rid of the dependence on sample data capacity. In this paper, the electrocardiogram (ECG) signal into spectrogram, and the model is trained with the ImageNet dataset, and then the trained model is transferred, because AlexNet model needs to be fixed image size, so the last pool layer is replaced by a spatial pyramid pooling layer, finally use Softmax classifier for PhysioNet challenge 2017 electrocardiogram data sets are classified, get a 92.84% accuracy and 83.26% F1.
深度学习是机器学习的一个分支,它的方法现在被用来解决各种问题。深度学习算法可以从海量数据中学习高级特征,并自动提取特征,这使得深度学习超越了传统的机器学习算法。然而,由于深度学习算法依赖于大量数据且运行速度太慢,因此迁移学习应运而生。迁移学习允许使用相关领域的现有知识来解决目标领域中只有少量样本数据的学习问题。将深度学习和迁移学习两种技术相结合,一方面可以自动学习数据样本的高级特征,另一方面可以摆脱对样本数据容量的依赖。本文将心电图(ECG)信号转化为频谱图,并使用ImageNet数据集对模型进行训练,然后对训练后的模型进行传输,由于AlexNet模型需要固定图像大小,因此将最后一层池层替换为空间金字塔池层,最后使用Softmax分类器对PhysioNet挑战2017年的心电图数据集进行分类,获得了92.84%的准确率和83.26%的F1。
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引用次数: 1
An ECG Sparse Noise Reduction Method based on Deep Unfolding Network 基于深度展开网络的心电稀疏降噪方法
Bingxin Xu, Rui-xia Liu, Yinglong Wang
ECG is a kind of weak body surface signal that is easily disturbed by noise during the collection process. The traditional ECG signal denoising technology depends on effective filters, which is artificially created by experience. Once the form of the signal is updated, the inherent space may no longer be suitable for this problem. As the deep learning method can learn sparse features from the data without manual intervention. We designed a deep learning process to apply the powerful functions of neural networks to the inference of the ECG sparse noise reduction model, which can also solve the optimization problem in sparse signal processing. By using this method of deep expansion, an optimization strategy is proposed, which turns the iterative optimization problem into constructing a new network framework. In this way, the model parameters can be easily solved through cross-layer. Through experimental verification, our method improves the SNR by 83.29% compared with the current advanced method.
心电信号是一种微弱的体表信号,在采集过程中容易受到噪声的干扰。传统的心电信号去噪技术依赖于有效的滤波器,这些滤波器是根据经验人为地制造出来的。一旦信号的形式被更新,固有空间可能不再适合这个问题。由于深度学习方法可以在不需要人工干预的情况下从数据中学习稀疏特征。我们设计了一个深度学习过程,将神经网络的强大功能应用于心电稀疏降噪模型的推理,也可以解决稀疏信号处理中的优化问题。利用这种深度展开方法,提出了一种优化策略,将迭代优化问题转化为构建新的网络框架。这样可以方便地通过跨层求解模型参数。通过实验验证,与现有的先进方法相比,该方法的信噪比提高了83.29%。
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引用次数: 0
Research on the performance of fuel cell vehicle at cold start of -30 ℃ 燃料电池汽车-30℃冷启动性能研究
Tong Wang, Nanlin Lei, Shaoqing He, Xiaoyu Jia, Qiang Zhang, Feikun Zhou, Wenwen Guo
In this paper, collected the operation data of a fuel cell vehicle (FCV) at - 30 ℃ by analyzing the vehicle CAN message. Took stack temperature, stack voltage, stack calorific value and battery SOC as the target objects, analyzed the control logic of fast cold start of the fuel cell vehicle stack at low temperature, and summarized the technical highlights of the fuel cell vehicle, which can be used to guide the product development of domestic automobile enterprises.
本文通过对车辆CAN报文的分析,采集了某型燃料电池汽车在- 30℃下的运行数据。以堆温度、堆电压、堆热值和电池荷电状态为目标对象,分析了燃料电池汽车堆在低温下快速冷启动的控制逻辑,总结了燃料电池汽车的技术亮点,可用于指导国内汽车企业的产品开发。
{"title":"Research on the performance of fuel cell vehicle at cold start of -30 ℃","authors":"Tong Wang, Nanlin Lei, Shaoqing He, Xiaoyu Jia, Qiang Zhang, Feikun Zhou, Wenwen Guo","doi":"10.1109/imcec51613.2021.9481959","DOIUrl":"https://doi.org/10.1109/imcec51613.2021.9481959","url":null,"abstract":"In this paper, collected the operation data of a fuel cell vehicle (FCV) at - 30 ℃ by analyzing the vehicle CAN message. Took stack temperature, stack voltage, stack calorific value and battery SOC as the target objects, analyzed the control logic of fast cold start of the fuel cell vehicle stack at low temperature, and summarized the technical highlights of the fuel cell vehicle, which can be used to guide the product development of domestic automobile enterprises.","PeriodicalId":240400,"journal":{"name":"2021 IEEE 4th Advanced Information Management, Communicates, Electronic and Automation Control Conference (IMCEC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115770476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Method Based on Quinn Algorithm to Improve The Accuracy of PMF-FFT Doppler Frequency Estimation 基于Quinn算法提高PMF-FFT多普勒频率估计精度的方法
Sun Xi-yan, Hu Xun-Xiong, Ji Yuan-fa, Guo Ning
In the satellite positioning receiver, it is essential to capture the satellite signal and obtain the carrier and Doppler frequency. Whereas, there is a vital problem that the Doppler frequency offset of 100 kilohertz with the change rate of thousands of kilohertz per second under the high dynamic environment which has higher requirements on capture algorithm. Aiming at the Doppler frequency search efficiency of traditional PMF-FFT algorithm, this paper proposes a Quinn-PMF-FFT. Before estimating the Doppler frequency, there is double zero padding, the point of signal does 2N to fill after zero Fourier transform arithmetic, and makes the increase in the number of spectral signal spectrum in the main lobe, then gets more spectral information to modified of the peak position. It is also can obtain more accurate Doppler frequency estimation, and carry out the simulation experiment. Via comparing the mean square frequency error, it is verified that the Quinn-PMF-FFT algorithm can avoid the error of interpolation direction in high dynamic environment, and has higher search efficiency and estimation accuracy.
在卫星定位接收机中,卫星信号的捕获、载波频率和多普勒频率的获取是至关重要的。然而,在高动态环境下,以每秒数千千赫兹的速率变化的100千赫兹的多普勒频偏是一个至关重要的问题,这对捕获算法提出了更高的要求。针对传统PMF-FFT算法的多普勒频率搜索效率低的问题,提出了一种Quinn-PMF-FFT算法。在估计多普勒频率之前,对信号的点进行双零填充,经过傅里叶零变换运算后对其进行2N次填充,使频谱信号的频谱数在主瓣中增加,从而得到更多的频谱信息对峰值位置进行修正。该方法还可以获得更精确的多普勒频率估计,并进行仿真实验。通过对频率均方误差的比较,验证了Quinn-PMF-FFT算法在高动态环境下能够避免插值方向误差,具有较高的搜索效率和估计精度。
{"title":"A Method Based on Quinn Algorithm to Improve The Accuracy of PMF-FFT Doppler Frequency Estimation","authors":"Sun Xi-yan, Hu Xun-Xiong, Ji Yuan-fa, Guo Ning","doi":"10.1109/IMCEC51613.2021.9482369","DOIUrl":"https://doi.org/10.1109/IMCEC51613.2021.9482369","url":null,"abstract":"In the satellite positioning receiver, it is essential to capture the satellite signal and obtain the carrier and Doppler frequency. Whereas, there is a vital problem that the Doppler frequency offset of 100 kilohertz with the change rate of thousands of kilohertz per second under the high dynamic environment which has higher requirements on capture algorithm. Aiming at the Doppler frequency search efficiency of traditional PMF-FFT algorithm, this paper proposes a Quinn-PMF-FFT. Before estimating the Doppler frequency, there is double zero padding, the point of signal does 2N to fill after zero Fourier transform arithmetic, and makes the increase in the number of spectral signal spectrum in the main lobe, then gets more spectral information to modified of the peak position. It is also can obtain more accurate Doppler frequency estimation, and carry out the simulation experiment. Via comparing the mean square frequency error, it is verified that the Quinn-PMF-FFT algorithm can avoid the error of interpolation direction in high dynamic environment, and has higher search efficiency and estimation accuracy.","PeriodicalId":240400,"journal":{"name":"2021 IEEE 4th Advanced Information Management, Communicates, Electronic and Automation Control Conference (IMCEC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123868244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the propagation characteristics of the electromagnetic wave across water film on the surface of the towed antenna 电磁波在拖曳天线表面水膜上的传播特性研究
Shiyu Wang, Lihua Li, Tianhui Fu, S. Feng, Yongbin Wang
Based on Maxwell equations, the propagation characteristics of electromagnetic waves across the three layers of the air-water-film-towed cable propagation medium were analyzed, the effect of the antenna's proximity to the medium was proved, and the influence of the seawater film attached to the outside of the towed cable on the reception performance of the towed antenna was obtained, and the FEKO electromagnetic simulation software was used for example verification.
基于Maxwell方程,分析了电磁波在三层空气-水膜拖曳电缆传播介质中的传播特性,验证了天线与介质接近度的影响,得到了拖曳电缆外部附着海水膜对拖曳天线接收性能的影响,并利用FEKO电磁仿真软件进行了实例验证。
{"title":"Study on the propagation characteristics of the electromagnetic wave across water film on the surface of the towed antenna","authors":"Shiyu Wang, Lihua Li, Tianhui Fu, S. Feng, Yongbin Wang","doi":"10.1109/IMCEC51613.2021.9481967","DOIUrl":"https://doi.org/10.1109/IMCEC51613.2021.9481967","url":null,"abstract":"Based on Maxwell equations, the propagation characteristics of electromagnetic waves across the three layers of the air-water-film-towed cable propagation medium were analyzed, the effect of the antenna's proximity to the medium was proved, and the influence of the seawater film attached to the outside of the towed cable on the reception performance of the towed antenna was obtained, and the FEKO electromagnetic simulation software was used for example verification.","PeriodicalId":240400,"journal":{"name":"2021 IEEE 4th Advanced Information Management, Communicates, Electronic and Automation Control Conference (IMCEC)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121947539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
2021 IEEE 4th Advanced Information Management, Communicates, Electronic and Automation Control Conference (IMCEC)
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