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2021 8th International Conference on Information, Cybernetics, and Computational Social Systems (ICCSS)最新文献

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Research on Underwater Object Detection Based on Improved YOLOv4 基于改进型YOLOv4的水下目标检测研究
Wang Hao, Nangfeng Xiao
The complex underwater environment and lighting conditions make underwater images suffer from texture distortion and color variations. In this paper, we propose an improved YOLOv4 detection method to detect four underwater organisms: holothurian, echinus, scallop, starfish and waterweeds. Firstly, we modified the network structure, added a deep separable convolution to the backbone network, and added a 152×152 feature map, which is conducive to the detection of small targets. Secondly, k-means clustering algorithm is used to cluster the bounding box in the data set, and the size of the bounding box is improved according to the clustering results. Thirdly, we propose a new module (EASPP, Spatial Pyramid Pooling), which increases slightly the model complexity, but the improvement effect is significant. Finally, when training the model, we use multi-scale training to better train targets with different scales. The experimental results show that on our test set, the improved method in the underwater object detection method is 4.8% higher than the original YOLOv4 model in accuracy (AP), the F1-score is 5.1% higher than that of the original method, and for mAP@0.5 it reaches 81.5%, which is 5.6% higher than that of the original method, which can be concluded that our method is effective.
复杂的水下环境和光照条件使得水下图像存在纹理失真和色彩变化等问题。在本文中,我们提出了一种改进的YOLOv4检测方法,用于检测四种水下生物:海参、棘爪、扇贝、海星和水草。首先,我们对网络结构进行修改,在骨干网络中加入深度可分离卷积,并加入152×152特征映射,有利于小目标的检测。其次,采用k-means聚类算法对数据集中的边界框进行聚类,并根据聚类结果对边界框的大小进行改进;第三,我们提出了一个新的模型(EASPP,空间金字塔池),该模型的复杂度略有增加,但改进效果显著。最后,在训练模型时,采用多尺度训练,更好地训练不同尺度的目标。实验结果表明,在我们的测试集上,改进后的方法在水下目标检测方法中的准确率(AP)比原来的YOLOv4模型提高了4.8%,f1得分比原来的方法提高了5.1%,对于mAP@0.5达到了81.5%,比原来的方法提高了5.6%,可见我们的方法是有效的。
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引用次数: 5
Overview of Ethernet Physical Layer Chip Technology for Internet of energy Terminal 能源终端互联网以太网物理层芯片技术综述
Liu Yong, Yingying Chi, Zheng Zhe, Liu Rui, Cui Wenpeng, Jia Xiaoguang
Based on summary of the main international standards of Ethernet physical layer chip and its working principle, this paper analyzed the requirements of the Ethernet physical layer chip in different Internet of energy terminals of Smart Substation, Distribution communication, Smart power plant, such as the communication bandwidth, electromagnetic compatibility, operating temperature. Technical requirements such as time-synchronization and energy saving also are summarized. The Ethernet physical layer core supporting IEEE1588 timestamp function can improve the sampling synchronization accuracy, and the physical layer chip supporting IEEE802.3az high efficiency and energy saving Ethernet standard can significantly reduce the energy consumption and cost of the device for power distribution devices powered by off-line power supply.
本文在总结以太网物理层芯片的主要国际标准及其工作原理的基础上,分析了以太网物理层芯片在智能变电站、配电通信、智能电厂不同能源互联网终端的通信带宽、电磁兼容性、工作温度等方面的要求。总结了时间同步、节能等技术要求。支持IEEE1588时间戳功能的以太网物理层内核可提高采样同步精度,支持IEEE802.3az高效节能以太网标准的物理层芯片可大幅降低采用离线供电方式供电的配电设备的能耗和成本。
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引用次数: 0
Stealthy False Data Injection Attacks against Extended Kalman Filter Detection in Power Grids 针对电网扩展卡尔曼滤波检测的隐形假数据注入攻击
Yifa Liu, Wenchao Xue, S. He, Long Cheng
The power grid is a kind of national critical infrastructure directly affiliated to human daily life. Because of the vital functions and potentially significant losses, the power grid becomes an excellent target for many malicious attacks. Due to the special nonlinear measurements, many detection methods do not match the grid very well. The extended Kalman filter based detection is one of the few methods suitable for nonlinear system detection, and therefore can be used in power system to spot malicious attacks. However, the reliability and effectiveness of the extended Kalman filter based detection have not been fully studied and adequately guaranteed. By proposing a two-step false data injection attack strategy, this paper gives a stealthy way to inject false data of increasing magnitude into the power grid, which can eventually cause a certain degree of deviation of the grid state without being detected. In the simulation, the method proposed in this paper caused a voltage deviation of more than 25% before being discovered in the power system.
电网是与人类日常生活直接相关的国家关键基础设施。由于电网的重要功能和潜在的重大损失,电网成为许多恶意攻击的绝佳目标。由于特殊的非线性测量,许多检测方法不能很好地匹配网格。基于扩展卡尔曼滤波的检测方法是为数不多的适用于非线性系统检测的方法之一,因此可以用于电力系统的恶意攻击检测。然而,基于扩展卡尔曼滤波的检测的可靠性和有效性还没有得到充分的研究和充分的保证。本文提出了一种两步假数据注入攻击策略,给出了一种将越来越大的假数据注入电网的隐蔽方法,最终可以在不被发现的情况下造成电网状态的一定程度的偏差。在仿真中,本文提出的方法在电力系统中被发现之前造成了超过25%的电压偏差。
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引用次数: 0
Dynamic KPCA for Feature Extraction of Wastewater Treatment Process 污水处理过程特征提取的动态KPCA
Xiaoye Fan, Xiaolong Wu, Hong-gui Han
The feature extraction method is an effective tool to understand the behavior of plug-flow wastewater treatment process (PF-WWTP). However, it is a challenge to extract feature components due to PF-WWTP subjected to the time-varying system with dataset mismatch. To solve this problem, in this paper, an adaptive feature extraction method (AFEM) based on dynamic kernel principal component analysis (KPCA) is proposed to improve the feature extraction accuracy. First, a data adjustment method is proposed to adapt datasets of process variables to the different hydraulic residence time. Then, the matching datasets can be used to observe the dynamics of metabolism within PF-WWTP. Second, a dynamic KPCA algorithm based on iterative calculation is introduced to obtain the contribution of feature components for process variables. This algorithm can update the order of feature components online following with the time-varying flow-rates of PF-WWTP. Third, an error-oriented self-adaptive mechanism is designed to determine the dimension of feature components for process variables. This mechanism not only performs preferable feature extraction without giving thresholds but also ensures its realtime accuracy. Finally, AFEM is compared with some existing feature extraction methods through experiments. The results show that the proposed AFEM can accurately extract feature components for PF-WWTP.
特征提取方法是了解塞流污水处理过程行为的有效工具。然而,由于PF-WWTP受时变系统和数据不匹配的影响,提取特征成分是一个挑战。针对这一问题,本文提出了一种基于动态核主成分分析(KPCA)的自适应特征提取方法(AFEM),以提高特征提取的精度。首先,提出了一种数据调整方法,使过程变量的数据集适应不同的水力停留时间。然后,使用匹配的数据集来观察PF-WWTP内的代谢动态。其次,引入一种基于迭代计算的动态KPCA算法,获取过程变量特征分量的贡献;该算法可以随PF-WWTP的时变流量在线更新特征分量的顺序。第三,设计了一种面向误差的自适应机制来确定过程变量特征分量的维度。该机制不仅在不给出阈值的情况下进行了较好的特征提取,而且保证了特征提取的实时性。最后,通过实验对现有的几种特征提取方法进行了比较。结果表明,所提出的AFEM能够准确提取PF-WWTP的特征分量。
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引用次数: 0
Sliding mode control of a 2-DOF helicopter system with adaptive input compensation 基于自适应输入补偿的二自由度直升机系统滑模控制
Xuejing Lan, Weijie Yang, Jianing Zhang, Zhijia Zhao, Ge Ma, Zhifu Li
This paper considers the decoupling control problem of a two-degree-of-freedom (2-DOF) helicopter system with uncertainties and disturbances. The unknown input bias caused by the dynamical coupling is approximated by fuzzy neural networks. An adaptive sliding mode control (SMC) strategy is proposed to deal with the uncertainties and unknown disturbances on the system. By appropriately constructing the Lyapunov function, the stability of the controlled system is proved. Finally, the effectiveness and availability of the strategy are verified by numerical simulation.
研究了一类具有不确定性和干扰的二自由度直升机系统的解耦控制问题。采用模糊神经网络对动态耦合引起的未知输入偏差进行逼近。针对系统存在的不确定性和未知干扰,提出了一种自适应滑模控制策略。通过适当构造Lyapunov函数,证明了被控系统的稳定性。最后,通过数值仿真验证了该策略的有效性和有效性。
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引用次数: 0
EGCN: Ensemble Graph Convolutional Network for Neural Architecture Performance Prediction 用于神经结构性能预测的集成图卷积网络
Xin Liu, Zixiang Ding, Nannan Li, Yaran Chen, Dong Zhao
Neural Architecture Search (NAS) is proposed to automatically search novel neural networks. Currently, one typical problem of NAS is that its computation requirements are too high to stand for most researchers. In fact, it consumes a lot of resources to train subnetworks for architecture search. If the performance of each subnetwork can be predicted accurately without training, the computational burden will be alleviated. Graph Convolutional Network (GCN) is proven to have powerful capabilities for topological information perception and extraction. It is suitable to use GCN for predicting neural architecture performance which is related to its topology.In this paper, we treat GCN as the performance predictor with two improvements. First, a novel neural architecture data processing method named DATAPRO2 is designed to improve GCN’s performance. Then, we propose EGCN, a model-based performance predictor which employs ensemble technique on GCN with DATAPRO2 to alleviate the overfitting issue caused by the imbalanced dataset for neural architecture performance prediction. Experimental results on CVPR-2021-NAS-TRACK2 dataset show that EGCN contributes to obtaining better predictive performance than vanilla GCN and other popular predictors.
提出了神经结构搜索(Neural Architecture Search, NAS)来自动搜索新的神经网络。目前,NAS的一个典型问题是其计算需求过高,大多数研究人员无法承受。实际上,为了进行体系结构搜索而训练子网需要消耗大量的资源。如果能在不经过训练的情况下准确预测每个子网的性能,将减轻计算负担。图卷积网络(GCN)被证明具有强大的拓扑信息感知和提取能力。GCN适合用于预测与拓扑结构相关的神经结构性能。在本文中,我们将GCN作为性能预测器,并进行了两个改进。首先,设计了一种新的神经结构数据处理方法DATAPRO2,以提高GCN的性能。然后,我们提出了一种基于模型的性能预测器EGCN,它将集成技术与DATAPRO2结合在GCN上,以缓解神经结构性能预测中由于数据不平衡而导致的过拟合问题。在CVPR-2021-NAS-TRACK2数据集上的实验结果表明,EGCN比香草GCN和其他流行的预测器具有更好的预测性能。
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引用次数: 0
Fixed-/Preassigned-Time Anti-Synchronization of Chaotic Neural Networks 混沌神经网络的固定/预分配时间反同步
Haoyu Li, Leimin Wang
This paper investigates a unified controller to solve the fixed-time anti-synchronization (FTAS) and preassigned-time anti-synchronization (PTAS) problems for chaotic neural networks. Under our controller, chaotic neural network can realize anti-synchronization within the fixed or preassigned time which greatly expands the practical application range of the anti-synchronization. In addition, sufficient conditions and time estimation on FTAS and PTAS are derived. Finally, the feasibility of the control scheme is proved via a numerical simulation.
本文研究了一种统一控制器来解决混沌神经网络的定时反同步(FTAS)和预分配时间反同步(PTAS)问题。在该控制器的控制下,混沌神经网络可以在固定或预先设定的时间内实现反同步,极大地扩展了反同步的实际应用范围。此外,还推导了自由贸易区和自由贸易区的充分条件和时间估计。最后,通过数值仿真验证了该控制方案的可行性。
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引用次数: 0
Safety Analysis of Automatic Crane Trolley Running System Based on STAMP/STPA 基于STAMP/STPA的起重机小车自动运行系统安全性分析
Wenbo Zhang, Xiangkun Meng, Jianyuan Wang, Tie-shan Li, Qihe Shan, Fei Teng
Automatic crane is a complex system affected by the external environment and the internal components of the system, information fusion, software and hardware combination, and man-machine integration. The improvement of its automation and informatization proposes various challenges in the accident model construction and safety analysis. However, the safety analysis methods based on fault types consider that the occurrence of accidents is linear and ignore the correlation among components of the system. This paper adopts the system-theoretic accident model and process (STAMP) and system-theoretic process analysis (STPA) mode is to implement safety analysis of the automatic crane trolley running system (ACTRs). The paper starts from the identification of system-level losses and hazards, clarifies the function and internal logical control relationships of the system’s components, and then finds potential unsafe control actions (UCAs) and loss scenarios during the trolley running. The results show that the control requirements for the regular operation of the trolley running system can be analyzed in detail. Therefore, the STAMP/STPA can apply to the safety investigation of automatic cranes.
自动起重机是一个受外部环境和系统内部构件影响、信息融合、软硬件结合、人机一体化的复杂系统。其自动化和信息化程度的提高,对事故模型构建和安全分析提出了各种挑战。然而,基于故障类型的安全分析方法认为事故的发生是线性的,忽略了系统各组成部分之间的相关性。本文采用系统理论事故模型与过程(STAMP)和系统理论过程分析(STPA)模型对起重机自动小车运行系统(ACTRs)进行安全性分析。本文从系统级损失和危害的识别入手,明确系统各组成部分的功能和内部逻辑控制关系,进而发现电车运行过程中潜在的不安全控制动作(uca)和损失场景。结果表明,可以详细分析台车运行系统正常运行的控制要求。因此,STAMP/STPA可以应用于自动起重机的安全性研究。
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引用次数: 2
Semi-Supervised Deep Clustering with Soft Membership Affinity 具有软隶属关系的半监督深度聚类
Haixiao Zhao, Rongrong Wang, Jin Zhou, Shiyuan Han, Tao Du, Ke Ji, Ya-ou Zhao, Kun Zhang, Yuehui Chen
As an effective deep clustering method, improved deep embedding clustering can process large-scale high-dimensional data. However, the method only focuses on the global data and does not consider the local graph structure between data points. In this paper, a semi-supervised deep clustering algorithm with soft membership affinity is proposed to cluster high-dimensional datasets. The proposed algorithm is composed of three parts: the reconstruction loss is adopted to recover data and extract important features on latent space, the KL divergence between the soft assignment and the target distribution is utilized to make samples in each cluster distribute more densely, and the novel soft membership affinity, which is regarded as the semi-supervised information, is introduced to the IDEC model to constrain the relationship between data points and their neighbors, so as to further enhance the clustering performance. Experiments on datasets show that the algorithm is effective compared with other deep clustering algorithms.
作为一种有效的深度聚类方法,改进的深度嵌入聚类可以处理大规模的高维数据。然而,该方法只关注全局数据,没有考虑数据点之间的局部图结构。针对高维数据集的聚类问题,提出了一种具有软隶属关系的半监督深度聚类算法。该算法由三部分组成:利用重建损失恢复数据并提取潜在空间上的重要特征,利用软分配与目标分布之间的KL散度使每个聚类中的样本分布更加密集,并在IDEC模型中引入作为半监督信息的新型软隶属度亲和性来约束数据点与相邻数据点之间的关系,从而进一步提高聚类性能。数据集实验表明,与其他深度聚类算法相比,该算法是有效的。
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引用次数: 0
A Prediction Model for Remaining Useful Life of Turbofan Engines by Fusing Broad Learning System and Temporal Convolutional Network 基于广义学习系统和时间卷积网络的涡扇发动机剩余使用寿命预测模型
Kaihan Yu, Degang Wang, Hongxing Li
In this paper, a prediction model based on a broad learning system (BLS) and temporal convolutional network (TCN) is proposed to measure the remaining useful life (RUL) of turbofan engines. Firstly, a variational autoencoder (VAE) is used to extract important low-dimensional features from the engine sensor data. Then, the degradation information is extracted from the time and feature dimensions of fragment data using TCN. Further, the BLS combined with residual connection is used to enhance the nonlinear representation of the model. The proposed method is validated on the commercial modular aero propulsion system simulation (C-MAPSS) dataset and compared with some state-of-the-art methods. The experimental results show that the proposed method is effective in RUL prediction.
提出了一种基于广义学习系统(BLS)和时间卷积网络(TCN)的涡轮风扇发动机剩余使用寿命(RUL)预测模型。首先,使用变分自编码器(VAE)从发动机传感器数据中提取重要的低维特征;然后,利用TCN从碎片数据的时间维和特征维中提取退化信息。在此基础上,结合残差连接的BLS增强了模型的非线性表征。在商用模块化航空推进系统仿真(C-MAPSS)数据集上对该方法进行了验证,并与现有方法进行了比较。实验结果表明,该方法在RUL预测中是有效的。
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引用次数: 5
期刊
2021 8th International Conference on Information, Cybernetics, and Computational Social Systems (ICCSS)
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