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2023 International Conference on Computer Applications technology, CCAT 2023

作者： Xiong, Chao Wang, Xin Qiao, Xin Zhou, Zhi Wu, Hexi Ministry of Education Engineering Research Center of Nuclear Technology Application Nanchang China East China University of Technology School of Nuclear Science and Engineering Nanchang China Chengdu University of Technology The College of Nuclear Technology and Automation Engineering Chengdu China

ISBN: (纸本)9798350301540

This paper introduced the K-SVD algorithm of machine learning to Decompose and Reconstruct the airborne radiation data. According to the sparse representation method, the inaccuracy of gridding interpolation due to the mismatch of data dimension was reduced and then a self-adaptive dictionary was constructed via training the original data. After reconstruction by dictionary learning, the increase in terms of two indicators peak signal-to-noise ratio (PSNR) and structural similarity index measure (SSIM) as well as the noise signal extracted which obeyed a stripe-like distribution along the sideline testified that the KSVD encoding learning processing technique had effective results in reconstructing and de-noising airborne radiation data. © 2023 IEEE.

关键词： Signal to noise ratio

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Dual-Event-Triggered Intelligence Security Control for Multiagent Systems Against DoS Attacks With Applications in Mobile Robot Systems

IEEE Transactions on Artificial Intelligence

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IEEE Transactions on Artificial Intelligence 2024年第2期5卷 916-924页

作者： Liang, Hongjing Chang, Zhenyu Pan, Yingnan School of Automation Engineering University of Electronic Science and Technology of China Chengdu611731 China College of Control Science and Engineering Bohai University Jinzhou121013 China

The intelligence security control problem of multiagent systems in the presence of actuator faults is investigated against denial-of-service (DoS) attacks. Noticing that the DoS attacks usually make the actuator signal not available for distributed control protocols, a novel intelligence dual-event-triggered control strategy is developed to eliminate the impact of DoS attacks. This control strategy includes two related event triggers, respectively, set on different channels, in which the second event-triggered condition is related to the triggering sequence of the previous event. Through the coordination between two nested event triggers set on different channels, the controller is avoided by being affected by wrong signals caused by DoS attacks. The developed distributed control protocol can not only guarantee the realization of the tracking control task, but also ensure that no 'Zeno behavior' occurs in the process of the event triggering. Moreover, the obtained results are applied to the mobile robot systems. Finally, a numerical simulation example and a mobile robot system application are given to verify the feasibility and effectiveness of the proposed control strategy. © 2023 IEEE.

关键词： Mobile robots

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STARTUP ANALYSES OF A HELIUM-XENON GAS-COOLED REACTOR 30

STARTUP ANALYSES OF A HELIUM-XENON GAS-COOLED REACTOR

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30th International Conference on nuclear engineering, ICONE 2023

作者： Ma, Yugao Bao, Hui Lu, Jiahao Ding, Shuhua Zhang, Meng Yang, Xiaolong Deng, Jian Zhang, Muhao Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu610059 China

ISBN: (纸本)9784888982566

The Helium-Xenon (He-Xe) gas-cooled reactor uses a He-Xe gas mixture to remove the heat from the reactor core. It has the characteristics of a long life-cycle, simple operation, and high power-mass ratio, which has an excellent application prospect in the field of Space Reactors Power Systems. The high operation temperature distinguishes the He-Xe gas-cooled reactor from the traditional reactor in reactivity feedback characteristics. Except for the Doppler effect of the fuel and monolith, the thermal expansion also introduces reactivity feedback during reactor operation. In this work, reactivity feedback characteristics, steady-state characteristics, and transient characteristics of a hundred-kilowatt-level He-Xe gas-cooled reactor (Submersion-Subcritical Safe Space reactor, S4) were analyzed. The Doppler feedback characteristics and thermal expansion feedback coefficients of fuel, matrix, and reflector from the cold to the hot state of the S4 reactor core were calculated based on the reactor Monte Carlo code (RMC). The results show that the S4 reactor core is mainly affected by the fuel Doppler effect and the matrix thermal expansion effect. Furthermore, the temperature distributions of fuel and He-Xe gas of the S4 reactor were calculated using the He-Xe reactor transient analysis code (HXRTRAN). The transient characteristics of the S4 reactor core when different reactivity was introduced were analyzed. This study may provide a reference for the operation state of the He-Xe gas-cooled reactor. © 2023 by JSME.

关键词： Helium

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Radiation Damage Simulation Using Molecular Dynamics in Ni-Based Alloy 5

Radiation Damage Simulation Using Molecular Dynamics in Ni-B...

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2023 5th International Conference on Modeling, Simulation, Optimization and Algorithm, ICMSOA 2023

作者： Shen, Yanxin Yang, Yue Ou, Xuelian Wang, Peng You, Zhenjiang Tian, Xiaofeng The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Sichuan Sichuan Chengdu China Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu University of Technology Sichuan Chengdu China Center for Sustainable Energy and Resources Edith Cowan University JoondalupWA6027 Australia

In the present study, we investigated the irradiation-induced induction in Ni80Cr20, Ni80Fe20, Ni50Fe50, Ni40Fe40Cr20 by molecular dynamics (MD) simulation. A previously published modified potential is used to provide a detailed account of the process involved in the production and evolution of defects. Ni50Fe50 and Ni40Fe40Cr20 alloys exhibit comparable damage level and better radiation response compared to Ni80Cr20 and Ni80Fe20. The inhibition effect of interstitial clusters increases with the complexity of alloying elements. The alloying of Cr has resulted in Ni80Fe20 and Ni50Fe50 tend to form 1/3 dislocation loops while at the same time making Ni40Fe40Cr20 and Ni80Cr20 more susceptible to stacking fault tetrahedra formation than the remaining two alloys. © Published under licence by IOP Publishing Ltd.

关键词： Nickel alloys

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Presentation and Performance Analysis of a Direct-Drive Traction System for Rail Trains Incorporating a Disk PM Motor 6

Presentation and Performance Analysis of a Direct-Drive Trac...

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6th IEEE Conference on Energy Internet and Energy System Integration, EI2 2022

作者： Bao, Ze Jing, Hailian Zhang, Yumin Hou, Jinsong Zhou, Heng Zhang, Yefei Chengdu University of Technology College of Nuclear Technology and Automation Engineering Chengdu China

ISBN: (纸本)9798350347159

This paper presents a novel direct-drive electric traction system that incorporates a disk permanent magnet (PM) motor, which shows practical potential to urban rail trains. The disk PM motor can be directly mounted on the train wheel, which realizes the direct contact of power and load. First, conceptual structure of the direct-drive system is described. Then, the motor structure and its specifications are presented from the viewpoint of replacing the asynchronous motor of the existing ALSTOM 04A02 urban rail system. Machine parameters are calculated and 3-D finite element (3-D FEM) simulation is carried out to analyze magnetic field distribution. Design results demonstrate that the disk PM motor has distinguished advantages in power density and efficiency over the asynchronous motor in use, which would be more suitable for heavy-load rail trains. At last, the influence of harmonic current from the inverter on the harmonic torque of the disk PM motor is studied, and results demonstrate that the 6th harmonic torque is the main factor affecting the torque ripple and could be suppressed by further optimizing the machine parameters. This work can provide some reference for improving the train traction system, and has reference values to other electric traction systems. © 2022 IEEE.

关键词： Electric traction

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Optimization and Simulation of Production Line Layout Based on Plant Simulation 5

Optimization and Simulation of Production Line Layout Based ...

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5th IEEE International Conference on automation, Electronics and Electrical engineering, AUTEEE 2022

作者： Jiang, Shiming Li, Linlin Deng, Kai College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China

ISBN: (纸本)9781665471978

Manufacturing industry plays an important role in the country, and the optimization of factory facility layout design in basic manufacturing industry will affect the problem that needs to be solved urgently. The problem of facility layout optimization is not only an engineering research problem, but also more complex in practice, with high practicality. However, its interdisciplinary characteristics are also very obvious. Based on the principle of discrete system simulation, the initial model of the camshaft production line is established on the basis of determining the camshaft production process and the specific parameters of each machine tool. Secondly, according to the established model, discuss the working efficiency of each equipment, the working condition of the station, the failure efficiency of the production line and the bottleneck process, etc., run the model and analyze the results. According to the analysis of the simulation results of the model, it is gradually improved. Finally, the mass production of camshaft production line is discussed, and the initial population, individual fitness function, genetic parameters, etc. are analyzed. On this basis, genetic algorithm is used to optimize the scheduling problem, and the results are compared with the previous ones to verify whether the results are effective. © 2022 IEEE.

关键词： Multiobjective optimization

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Joint Spatial Similarity-based Attention for Retina Vessel Segmentation with Super Resolution Encoding 4

Joint Spatial Similarity-based Attention for Retina Vessel S...

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4th IEEE International Conference on Pattern Recognition and Machine Learning, PRML 2023

作者： Ekong, Favour Yu, Yongbin Patamia, Rutherford Agbeshi Sarpong, Kwabena Ukwuoma, Chiagoziem C. Cai, Jingye University of Electronic Science and Technology of China Information and Software Engineering Chengdu China Chengdu University of Technology Nuclear Technology and Automation Engineering Chengdu China

ISBN: (纸本)9798350324303

Machine learning methods based on fully convolutional networks have emerged as a viable choice for retinal vessel segmentation. However, when input samples significantly deviate from the training data distribution, these deep networks fail silently, posing serious challenges for automatic data processing pipelines. In our study, we question the effectiveness of randomly selecting unlabeled training target images for annotation and inclusion in the support set, as it may not facilitate an efficient fine-Tuning process. We propose a novel method to optimize the image selection procedure to address this. By utilizing our method, we can identify informative unlabeled target images by comparing the consistency of model predictions on these images under specific data augmentations. However, it should be noted that the model developed using the source datasets cannot accurately evaluate consistency on the target images. To overcome this issue, we suggest employing self-supervised pretext tasks to compute scores for unlabeled target images, resolving this limitation. The top few images with the lowest consistency scores can then be added to the support set and annotated by experts to fine-Tune the model for the target images. We introduce an upgraded encoder-decoder model which outperforms multi-scale prediction ensembling to address insufficient single-scale base learners. This paper proposes a novel module that uses joint spatial and channel attention and an auxiliary prototype similarity operation to enhance border localization and super-resolution in the encoder-decoder architecture. To evaluate the performance of our approach, we conducted experiments on two distinct datasets, integrating our joint spatial/channel attention-based module with auxiliary prototype similarity operation for super-resolution encoding. Our empirical results demonstrate the superiority of our proposed model over state-of-The-Art attention mechanisms used in super-resolution. © 2023 IEEE.

关键词： Decoding

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Security control for air-sea heterogeneous multiagent systems with cooperative-antagonistic interactions:An intermittent privacy preservation mechanism

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Science China(Technological Sciences) 2025年第4期68卷 179-192页

作者： Shoufeng YANG Hongjing LIANG Yingnan PAN Tieshan LI College of Control Science and Engineering Bohai UniversityJinzhou121013China School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu611731China Laboratory of Electromagnetic Space Cognition and Intelligent Control Beijing100089China

antagonistic interactions,data security and transient-steady state performance of the system are two key *** ensure data security,an intermittent privacy preservation(IPP)mechanism is proposed for the first time.A novel setting time initial mask function and a novel intermittent mask function are *** can implement intermittent preservation for the system according to actual requirements,which solves the irreversibility problem after conventional mask disappears and balances control accuracy and system *** ensure transient-steady state performance,a novel error transformation function(ETF)is proposed and integrated into the predefined-time prescribed performance control *** to conventional hyperbolic tangent type ETFs,the proposed ETF can improve the convergence accuracy of errors under the same ***,a unified model of the air-sea HMASs is established,which improves the model accuracy compared with the simplified ***,the proposed IPP security control strategy is applied to the air-sea delivery mission to verify its feasibility and effectiveness.

关键词： air-sea heterogeneous multiagent systems(HMASs) security control intermittent privacy preservation(IPP) error transformation function(ETF)

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Signal modeling and impulse response shaping for semiconductor detectors

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nuclear Science and Techniques 2022年第4期33卷 72-82页

作者： Xue-Yuan Wang Jian-Bin Zhou Ming Wang Huai-Ping Wang Xu Hong Yi Liu Ping Huang College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyErxian BridgeNo.1 East 3 RoadChenghua DistrictChengdu 610059China Jiangxi Engineering Technology Research Center of Nuclear Geoscience Data Science and System East China University of TechnologyNanchang 330013China China Testing Technology Co. LtdChengdu 610021China

The output-signal models and impulse response shaping(IRS)functions of semiconductor detectors are important for establishing high-precision measurement *** this paper,an output-signal model for semiconductor detector systems is *** to the proposed model,a multistage cascade deconvolution IRS algorithm was developed using the C-R inverse system,R-C inverse system,and differentiator *** silicon drift detector signals acquired from the analog-to-digital converter were *** experimental results indicated that the shaped pulses obtained using the proposed model had no undershoot,and the average peak base width of the output shaped pulses was reduced by 36%compared with that for a simple model proposed in a previous work[1].Offline processing results indicated that compared with the traditional IRS algorithm,the average peak base width of the output shaped pulses obtained using the proposed algorithm was reduced by 11%,and the total elapsed time required for pulse shaping was reduced by 26%.The proposed algorithm avoids recursive *** the sampling frequency of the digital system reaches 100 MHz,the proposed algorithm can be simplified to integer *** proposed IRS algorithm can be applied to high-resolution energy spectrum analysis,highcounting rate energy spectrum correction,and coincidence and anti-coincidence measurements.

关键词： Output-signal model Impulse response shaping C-R inverse system R-C inverse system Integer arithmetic

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Numerical Investigation on Transient Bounce Arc and Anode Surface Temperature 7

Numerical Investigation on Transient Bounce Arc and Anode Su...

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7th International Conference on Electric Power Equipment - Switching technology, ICEPE-ST 2024

作者： Chen, Shuang Yang, Ze Shi, Zongqian Wang, Lijun Sun, Jiajia School of Electronic Information and Electrical Engineering Chengdu University Chengdu China College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China Xi'an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Xi'an China

ISBN: (纸本)9798350388947

In this research, the closing arc and the bouncing arc are studied with transient MHD model. A transient self-consistent model is established using the dynamic meshing technology. The simulation results show that the ion density decreases significantly with the expansion of the arc column. As a result, the energy flux from the arc to the anode center decreases gradually as a power function. Since the energy flux is very high at the arc ignition, the anode temperature increases significantly at first. Then the maximum anode temperature begins to fall due to the decrease of the maximum energy flux. © 2024 IEEE.

关键词： Electromagnetic transients

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