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Acta Mechanica Sinica 2024年第3期40卷 145-152页

作者：赵硕李嘉祥安翠华林栎阳邓齐波胡宁 School of Mechanical Engineering Hebei University of Science and TechnologyShijiazhuang050018China Tianjin Key Laboratory of Power Transmission and Safety Technology for New Energy Vehicles School of Mechanical EngineeringHebei University of TechnologyTianjin300401China The Green Aeromechanics Research Institute Chongqing Jiaotong UniversityChongqing401120China State Key Laboratory of Reliability and Intelligence Electrical Equipment Key Laboratory of Advanced Intelligent Protective Equipment TechnologyMinistry of Educationand School of Mechanical EngineeringHebei University of TechnologyTianjin300401China

电催化的应变工程被认为是提高材料电催化性能最有效的策略之一.然而,目前还缺乏数学模型来深入理解这些有趣的科学现象.本文基于等效电路理论研究了应变对电极反应中法拉第过程的影响.根据基尔霍夫定律,获得了应变影响电极响应电流的... 详细信息

电催化的应变工程被认为是提高材料电催化性能最有效的策略之一.然而,目前还缺乏数学模型来深入理解这些有趣的科学现象.本文基于等效电路理论研究了应变对电极反应中法拉第过程的影响.根据基尔霍夫定律,获得了应变影响电极响应电流的数学表达式,研究了法拉第过程逐渐成为电催化反应的主导作用时,由应变导致的响应电流参数的变化趋势和峰值的变化规律,并深入探索电催化反应中不同因素相互作用的复杂机制.

关键词： Mechanical-electrochemistry coupling Electrocatalytic reaction Faradaic process Dynamic strain equivalent electrical circuit

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?-net: Dual supervised medical image segmentation with multi-dimensional self-attention and diversely-connected multi-scale convolution

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NEUROCOMPUTING 2022年 500卷 177-190页

作者： Xu, Zhenghua Liu, Shijie Yuan, Di Wang, Lei Chen, Junyang Lukasiewicz, Thomas Fu, Zhigang Zhang, Rui State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology China Tianjin Key Laboratory of Bioelectromagnetic Technology and Intelligent Health Hebei University of Technology China College of Computer Science and Software Engineering Shenzhen University China Department of Computer Science University of Oxford United Kingdom Department of Health Management Center 983 Hospital of Joint Logistics Support Force China www.ruizhang.info

Although U-Net and its variants have achieved some great successes in medical image segmentation tasks, their segmentation performances for small objects are still unsatisfactory. Therefore, in this work, a new deep model, co-Net, is proposed to achieve more accurate medical image segmentations. The advancements of co-Net are mainly threefold: First, it incorporates an additional expansive path into U-Net to import an extra supervision signal and obtain a more effective and robust image segmentation by dual supervision. Then, a multi-dimensional self-attention mechanism is further developed to highlight salient features and suppress irrelevant ones consecutively in both spatial and channel dimensions. Finally, to reduce semantic disparity between the feature maps of the contracting and expansive paths, we further propose to integrate diversely-connected multi-scale convolution blocks into the skip connections, where several multi-scale convolutional operations are connected in both series and parallel. Extensive experimental results on three abdominal CT segmentation tasks show that (i) co-Net greatly outperforms the state-of-the-art image segmentation methods in medical image segmentation tasks;(ii) the proposed three advancements are all effective and essential for co-Net to achieve the superior performances;and (iii) the proposed multi-dimensional self-attention (resp., diversely-connected multi scale convolution) is more effective than the state-of-the-art attention mechanisms (resp., multi-scale solutions) for medical image segmentations. The code will be released online after this paper is formally accepted. (c) 2022 Elsevier B.V. All rights reserved.

关键词： Medical image segmentation Dual supervision Multi-dimensional self-attention Diversely-connected multi-scale convolution

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Availability Assessment of the LEO Satellite Communication System with the Consideration of Satellite Handover

Availability Assessment of the LEO Satellite Communication S...

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Prognostics and System Health Management Conference (PHM-Qingdao)

作者： Yu Tian Ruiying Li Yuanyuan Wang Ji Ma Yeqing Song School of Reliability and Systems Engineering Beihang University Beijing China Science and Technology on Reliability and Environmental Engineering Laboratory Beijing China Deep Space Exploration Laboratory Beijing China

Satellite handover frequently occurs on low-earth-orbit (LEO) satellite communication systems, and it affects system availability. However, existing studies neglected such an impact. To solve the problem above, this paper proposed a topology modeling method, in which the satellite dynamic operation is divided into small time slices to simplify the system, and the earth ground is divided into grids to abstract the ground user's communication requirement. Then, the service availability is defined according to the key performance parameter of the communication service, delay, and a Monte Carlo-based availability assessment method is addressed with the consideration of the satellite handover. Finally, a case is used to analyze how satellite handover strategies affect service availability. and suggestions are given to improve system availability.

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Laser Induced Single Event Upset (SEU) Testing of Commercial Memory Devices with Embedded Error Correction Codes (ECC) 5

Laser Induced Single Event Upset (SEU) Testing of Commercial...

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2022 5th International Conference on Power Electronics and Control engineering, ICPECE 2022

作者： Han, Yang Liu, Yurong Lei, Zhifeng Zhang, Zhangang He, Yujuan School of Electronic and Information Engineering South China University of Technology Guangzhou510641 China Science and Technology on Reliability Physics and Application of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou511370 China

Results of laser-induced single event upset testing of devices with embedded error correction codes are described. Specifically, the memory system, consisting of a Micron MT41K256M16TW-107 IT: P 32 Meg×16×8 banks Dual Dynamic Random Access Memories (DDRs) was tested on a self-made test board. Two samples of each memory system or device type were irradiated with a pulsed laser. The units were irradiated by using a continual read/write correct loop in several bit patterns. Results for both correctable and uncorrectable errors are presented along with soft error data records. © Published under licence by IOP Publishing Ltd.

关键词： Pulsed lasers

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Health Assessment Method for Core Components of Switching Quantity Interface Circuit Based on Active Excitation Test

Health Assessment Method for Core Components of Switching Qu...

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International Conference on reliability, Maintainability and Safety,ICRMS

作者： Peiyang Xu Long Jia Jian Ma Chang Chen Wei Chen Chunyun Lan Xinyu Zou Tianhao Li Science & Technology on Reliability & Environmental Engineering Laboratory School of Reliability and Systems Engineering Beihang University Beijing China School of Automation Science and Electrical Engineering Beijing Aerospace Institute of Automatic Control Beihang University Beijing China Science & Technology on Reliability & Environmental Engineering Laboratory School of Reliability and Systems Engineering Institute of Reliability Engineering Beihang University Beijing China Beijing Aerospace Institute of Automatic Control Beijing China

ISBN: (数字)9798350329988

ISBN: (纸本)9798350329995

As power electronics technology continues to advance, the prevalence of switching quantity interface circuits has grown in diverse domains, encompassing industrial production and everyday civilian applications. An analysis of operational data from these circuits, along with an assessment of their overall health, proves instrumental in the timely detection and resolution of operational anomalies. This holds paramount significance in upholding the reliability of these interface circuits. Nevertheless, tracking the degradation trajectory of the core components during their operational lifespan poses a challenge. Typically, only two states, normal and abnormal, are readily discernible, making direct health assessment elusive. To address this issue, this study introduces a health assessment methodology for the fundamental components of switch quantity interface circuits based on active excitation testing. Through the application of active excitation, the performance decay profile of the optical coupler is ascertained, solving the problem of capturing the degradation process within these circuits. This approach facilitates the stable and precise characterization of the health status of switching quantity interface circuits. The health assessment method presented in this paper is characterized by modest computational resource demands and a reduced reliance on expert knowledge. It is adept at quantitatively delineating the health status of switch-quantity interface circuits with precision, thereby offering guidance for the maintenance and replacement of pivotal electronic components within these circuits. In doing so, it contributes to the assurance of operational dependability and an extension of the service life of switch quantity interface circuits.

关键词： Degradation Optical switches Electronic components Couplers Optical coupling Maintenance Trajectory Integrated circuit reliability Switching circuits Testing

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Characterizing large-scale weak interlayer shear zones using conditional random field theory

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Journal of Rock Mechanics and Geotechnical engineering 2023年第10期15卷 2611-2625页

作者： Gang Han Chuanqing Zhang Hemant Kumar Singh Rongfei Liu Guan Chen Shuling Huang Hui Zhou Yuting Zhang Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources Changjiang River Scientific Research InstituteWuhanChina State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhanChina University of Chinese Academy of Sciences BeijingChina Department of Petroleum Engineering and Geoengineering Rajiv Gandhi Institute of Petroleum TechnologyJaisAmethi229304India State Key Laboratory of Water Resources and Hydropower Engineering Science Institute of Engineering Risk and Disaster PreventionWuhan UniversityWuhan430072China Institute for Risk and Reliability Leibniz Universität HannoverHannover30167Germany

The shear behavior of large-scale weak intercalation shear zones(WISZs)often governs the stability of foundations,rock slopes,and underground ***,due to their wide distribution,undulating morphology,complex fabrics,and varying degrees of contact states,characterizing the shear behavior of natural and complex large-scale WISZs precisely is *** study proposes an analytical method to address this issue,based on geological fieldwork and relevant experimental *** analytical method utilizes the random field theory and Kriging interpolation technique to simplify the spatial uncertainties of the structural and fabric features for WISZs into the spatial correlation and variability of their mechanical *** Kriging conditional random field of the friction angle of WISZs is embedded in the discrete element software 3DEC,enabling activation analysis of WISZ C2 in the underground caverns of the Baihetan hydropower *** results indicate that the activation scope of WISZ C2 induced by the excavation of underground caverns is approximately 0.5e1 times the main powerhouse span,showing local ***,the overall safety factor of WISZ C2 follows a normal distribution with an average value of 3.697.

关键词： Interlayer shear weakness zone Baihetan hydropower station Conditional random field Kriging interpolation technique Activation analysis

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Capacity and Time reliability Evaluation for Time-Varying Networks

Capacity and Time Reliability Evaluation for Time-Varying Ne...

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IEEE International Conference on Software Quality, reliability and Security Companion (QRS-C)

作者： Ying Gao Ruiying Li Rui Kang School of Reliability and Systems Engineering Beihang University Beijing China Science and Technology on Reliability and Environmental Engineering Laboratory Beijing China Zhongfa Aviation Institute of Beihang University Hangzhou Zhejiang China

ISBN: (数字)9798350365658

ISBN: (纸本)9798350365665

Facing the challenges caused by Time-Varying Networks (TVNs), this paper proposes a capacity and time reliability evaluation method. The Time Aggregated Graph (TAG) and line graph are combined for modeling TVNs. Additionally, modeling steps of the existing line graph model is simplified to accelerate its generation. Then, the capacity and time reliability evaluation method is proposed through finding the minimal path sets considering both capacity demand and time requirements associated with timestamps (TS-d-t-MPs) of the TVN in multiple Monte Carlo iterations. A park road network is used as a case to demonstrate its solution procedure in evaluating the capacity and time reliability of TVN s.

关键词： Monte Carlo methods Network topology Roads Heuristic algorithms Software quality Software reliability Topology Security

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Hybrid deep neural network based prediction method for unsteady flows with moving boundary

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Acta Mechanica Sinica 2021年第10期37卷 1557-1566,I0003页

作者： Ren-Kun Han Zhong Zhang Yi-Xing Wang Zi-Yang Liu Yang Zhang Gang Chen State Key Laboratory for Strength and Vibration of Mechanical Structures Shannxi Key Laboratory for Environment and Control of Flight VehicleSchool of Aerospace EngineeringXi’an Jiaotong UniversityXi’an710049China Science and Technology on Reliability and Environment Engineering Laboratory Beijing Institute of Structure and Environment EngineeringBeijing100076China

Any motion, forced or free, of boundary affects the flow field around this boundary. A new kind of reduced order model (ROM) based on hybrid deep neural network is proposed to model flow field evolution process of unsteady flow around moving boundary. This hybrid deep neural network can map the relationship between the flow field at the next time step and the flow field and boundary positions at the previous time steps. Based on the learned information, the hybrid deep neural network can quickly and accurately predict the flow field. Unsteady flows around forced oscillation cylinder with various amplitudes, frequencies, and Reynolds numbers are simulated to establish the training and testing datasets. The prediction results of the hybrid deep neural network and the computational fluid dynamics (CFD) simulation results are consistent with high accuracy. The forces on the moving boundary can be integrated through the predicted flow field data. Good performance makes this new ROM method can be used in many fluid dynamics research fields, which needs fast and accurate simulation.

关键词： Deep neural network Flow fields prediction Moving boundary

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Crustal thickness,V_(P)/V_(S) ratio,and shear wave velocity structures beneath Myanmar and their tectonic implications

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Earthquake Research Advances 2022年第1期2卷 15-21页

作者： Lay Nwe Zigen Wei Zhiwei Li Feng Bao Xuelei Li Jintao Hu State Key Laboratory of Geodesy and Earth's Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan430077China Science and Technology on Reliability and Environmental Engineering Laboratory Beijing Institute of Spacecraft Environment EngineeringBeijing100094China School of Science Hunan University of Technology and BusinessChangsha410205China Department of Meteorology and Hydrology Ministry of Transport and CommunicationsMyanmar Hebei University of Engineering Handan056009China

The crustal structure in Myanmar can provide valuable information for the eastern margin of the ongoing IndoEurasian collision *** successively performed H-k stacking of the receiver function and joint inversion of the receiver function and surface wave dispersion to invert the crustal thickness(H),shear wave velocity(V_(S)),and the V_(P)/V_(S) ratio(k)beneath nine permanent seismic stations in Myanmar.H was found to increase from 26 km in the south and east of the study area to 51 km in the north and west,and the V_(P)/V_(S) ratio was complex and *** differences in the crust were observed for different tectonic *** the Indo-Burma Range,the thick crust(H~51 km)and lower velocities may be related to the accretionary wedge from the Indian *** the Central Myanmar Basin,the thin crust(H=26.9-35.5 km)and complex V_(P)/V_(S) ratio and V_(S) suggest extensional *** the Eastern Shan Plateau,the relatively thick crust and normal V_(P)/V_(S) ratio are consistent with its location along the western edge of the rigid Sunda Block.

关键词： Myanmar Crustal thickness VP/VSratio Shear wave velocity Receiver function Surface wave dispersion

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Research on Rapid Construction Method of reliability Target Load for Electric Drive System Based on Vehicle State Parameter Optimization 28

Research on Rapid Construction Method of Reliability Target ...

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28th ISSAT International Conference on reliability and Quality in Design, RQD 2023

作者： Zhen, Wang Sicheng, Deng Songlin, Zheng Lihui, Zhao Dongdong, Zhang Shuo, Weng School of Mechanical Engineering University of Shanghai for Science and Technology Shanghai200093 China CMIF Key Laboratory for Strength and Reliability Evaluation of Automotive Structures Shanghai200093 China Public Technology Platform for Reliability Evaluation of New Energy Vehicles in Shanghai Shanghai200093 China United Automotive Electronic Systems Co. Ltd Shanghai201206 China

ISBN: (纸本)9798986576121

The reliability target load is a critical factor in developing vehicle reliability assessment and fatigue life prediction. However, the varying driving behaviors and road conditions pose challenges for accurate load estimation. In this paper, we propose a fast method for constructing the reliability target load of the electric drive system using user's historical run data, combined with vehicle dynamics simulation and parameter optimization. To overcome challenges in obtaining accurate road slope and vehicle mass data, we optimize equivalent parameters to enhance the accuracy of load simulation for the electric drive system. Multi-objective optimization is employed to obtain an equivalent unified solution for a group of user model parameters, targeting a 95% user damage level. The validity of the reliability target load of the electric drive system is verified through comparison between vehicle dynamics simulation and actual user load in the time and damage domains. Our results reveal an error between the unified parameter obtained in this paper, its simulation load, and the 95-th percentile user's damage is only 0.74%, providing technical support for the effective development of electric drive system reliability evaluation, and a valuable reference for the construction of reliability target loads for the entire vehicle and other systems. © RQD 2023. All rights *** right reserved.

关键词： Multiobjective optimization

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