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11th IEEE International Conference on Cyber Security and Cloud Computing, CSCloud 2024

作者： Liu, Jian Zhang, Shaohua Yan, Siying Zhang, Xianchao Ren, Wei China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China Wuhan Antiy Information Technology Co. Ltd Wuhan China Jiaxing University Key Laboratory of Medical Electronics and Digital Health of Zhejiang Province Jiaxing China School of Computer Science China University of Geosciences Wuhan China Beijing Key Laboratory of Urban Spatial Information Engineering Beijing China

ISBN: (纸本)9798350376982

The recommendation algorithm may feed to end users information by analyzing the potential interests of the users in last interaction period, and finally the information obtained by the users may be constrained within a limited range. This problem is so-called information cocoon and has be attracted more and more attentions. In this paper, we study this problem in the perspective from both service providers and end users. An analysis model in terms of probabilistic transfer graph is proposed, and corresponding matrix is analyzed. We also propose a method to compute the power of matrix by approximating any transfer graph into a symmetric matrix, and the stability on the probability can be easily computed by matrix division and eigenvalues. © 2024 IEEE.

关键词： Transfer matrix method

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Research on Degradation Characteristics of Ultrasonic Motors Based on Accelerated Storage Test

Research on Degradation Characteristics of Ultrasonic Motors...

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International Symposium on System and Software reliability (ISSSR)

作者： Zemin Yao Shouqing Huang Huiming Zheng Hao Wang Pengfei Wang Beijing Key Laboratory of Environment and Reliability Test Technology for Aerospace Mechanical and Electrical Products Beijing P.R. China Key Laboratory of Reliability and Environmental Engineering Technology for National Defense Science and Technology Beijing P.R. China Beijing Institute of Spacecraft Environment Engineering Beijing P.R. China

This paper mainly uses the method of load spectrum compression to equivalently compress the long-term storage time of ultrasonic motors. According to the Arrhenius model and N-L model, the motor’s 18-year storage life is compressed into 18 environmental test profiles. Then, a test system was built to conduct critical performance testing at different time points during the test process. The measured impedance frequency response data, starting torque and locked torque were statistically analyzed. It was found that the resonant frequency of the ultrasonic motor gradually decreased with the prolongation of the storage test time; the starting torque increased gradually with the prolongation of the storage time; and the locked torque showed no obvious regularity with time. The reasons for these characteristics were briefly analyzed, providing reference data for the design improvement of ultrasonic motors.

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From laboratory to on-site operation:Reevaluation of empirically based electric water chiller models

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Building Simulation 2022年第2期15卷 213-232页

作者： Bin Zhang Shijun You Sheng Wang Xiaoxiao Ding Chuang Wang Yan Gao School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China State Key Laboratory of Air-Conditioning Equipment and System Energy Conservation Zhuhai 519070China Guangdong Key Laboratory of Refrigeration Equipment and Energy Conservation Technology Zhuhai 519070China Beijing Key Laboratory of Heating Gas SupplyVentilating and Air Conditioning EngineeringBeijing University of Civil Engineering and ArchitectureBeijing 100044China Beijing Advanced Innovation Center for Future Urban Design Beijing University of Civil Engineering and ArchitectureBeijing 100044China

Chiller model is a key factor to building energy simulation and chiller performance *** spread of new types of electric water chillers that have higher performance and wider operating range,new challenges have been faced by building energy simulation tools and their chiller *** work takes a new type of electric water chiller as a case study and reevaluates eight typical empirically based models for predicting the energy performance of electric water chiller to verify whether they are suitable for the new type of chiller,using both laboratory test data from chiller manufacturer and online monitoring data from on-site operation of a central cooling plant with chillers of the same *** prediction ability of the chiller models(including model prediction accuracy and generation ability)in laboratory test and on-site operation situations are *** results show that the existing models can well describe the chiller performance in the laboratory test situation but perform poorly in the on-site operation *** the best two models in the laboratory dataset,the overall prediction errors of DOE-2 and GN model increase more than 250%and 75%respectively in the field *** big discrepancy of model prediction accuracy in the two situations is mainly due to the differences of evaporator and condenser water flow rates between the laboratory and on-site operation datasets,which indicates the limitations of the empirical chiller models and implies further research in future in order to improve the suitability and reliability of chiller model.

关键词： electric water chiller performance model model validation model prediction ability variable water flow rates

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Comparative analysis of Degradation of SiC MOSFET Power Module with Different Proportions of Al/Cu Buffer under Power Cycling

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IEEE Transactions on Components, Packaging and Manufacturing technology 2025年

作者： Mei, Yunhui Zhang, Songmao Chen, Yuan Li, Longnv Li, Daohang Pei, Yongqi Wang, Lu Tiangong University School of Electrical Engineering Tianjin Key Laboratory of Intelligent Control of Electrical Equipment Tianjin300387 China China Electronic Product Reliability and Environmental Testing Research Institute National Key Laboratory of Science and Technology on Reliability Physics and Application of Electronic Component Guangzhou511370 China Tiangong University School of Electrical Engineering Tianjin300387 China

Due to the mismatch in thermal expansion coefficient (CTE) between the SiC chip and the bonding wire, there is a sever thermal-mechanical stress at the bonding interface, causing a significant reduction in the reliability of the bonding wire. By using sintered silver to connect an Al/Cu buffer layer at the top of the chip, the mismatch in CTE between the bonding wire and the chip can be improved, greatly enhancing the reliability of the bonding wire. The integration of the buffer layer with Ag sintering technology significantly improves the reliability of power modules and enhances power density. Furthermore, the buffer layer increases the thermal capacity, thereby reducing the operating temperature of the semiconductor device. In this study, the effects of different Al/Cu stress buffer layers with different proportions on the reliability of the single-sided molded SiC power module with Al bonding wire were investigated through sub-second power cycling tests, and the failure modes of the bonding wire were characterized. The results show that the failure point of the bonding wire in the module with an Al/Cu stress buffer layer is located at the cracking of the bonding wire heel. Among the 10μm-Al/40μm-Cu buffer layers with good electrical conductivity, the module with this buffer layer has a longer lifetime. © 2025 IEEE. All rights reserved.

关键词： Sintering

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Software fault localization based on eigenvector centrality in complex network theory

Software fault localization based on eigenvector centrality ...

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

作者： Wentao Wu Shihai Wang Yuanxun Shao Wandong Xie School of Reliability and Systems Engineering Beihang University Beijing China Science and Technology on Reliability and Environmental Engineering Laboratory China State Key Laboratory of Software Development Environment China Aerospace Science and Engineering Network Information development CO. LTD Beijing China Information Center of China North Industries Group Corporation Beijing China

ISBN: (数字)9798350365658

ISBN: (纸本)9798350365665

Software debugging plays a crucial role in fault localization tasks, and spectrum-based fault localization (SBFL) is a hot topic in software automation debugging research. However, existing SBFL technologies are generally limited by tie within ranks, where a large number of elements share the same suspiciousness, which in turn severely limits the performance of SBFL. To this end, we propose an SBFL model based on eigenvector centrality (FLEC). This algorithm first utilizes the statement coverage information in the program spectrum to construct a statement network, and adopts the correlation between statements as edge weights. Then, FLEC takes statement suspiciousness as node weight. On this basis, the algorithm utilizes the eigenvector centrality to calculate the weighted suspiciousness of each statement while considering both node importance and correlation between nodes. Finally, FLEC conducted experimental validation on 3 datasets of Defects4J, and the results showed an average improvement of 10.7% in ACC@N compared to the optimal baseline.

关键词： Location awareness Correlation Software algorithms Software quality Debugging Complex networks reliability engineering Software reliability Security Software debugging

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An Asymmetric Arc-Shaped Coupler–Based WPT Design for High Misalignment Tolerance Charging of AUVs

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International Journal of Circuit Theory and Applications 2025年第0期

作者： Deng, Shuming Cai, Changsong Wang, Junhua Jiang, Yufeng Zhang, Xian Wan, Leke Wu, Xi Du, Yinfeng Zhou, Yingguo Hubei Key Laboratory of Power Equipment & System Security for Integrated Energy School of Electrical Engineering and Automation Wuhan University Hubei Wuhan China State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin China School of Materials Science and Engineering Jiangsu University of Science and Technology Zhenjiang China

In contact with a wide area of seawater, the use of a typical planar coil structure generates the problem of large fluctuations of the overall efficiency and power when the system encounters environmental disturbances. In order to improve the misalignment tolerance of the system, this article proposes a high misalignment tolerance WPT system with constant current output based on the asymmetric arc-shaped coupler and LCC-P compensation topology. This design effectively increases the horizontal and rotation misalignment tolerance, so that the fluctuation of the overall efficiency and power of the system greatly declines when coming across disturbances. The article firstly establishes the equivalent circuit model and deduces the equations about parameter configuration and the output characteristics of the system. Furthermore, the asymmetric arc-shaped coupler is designed, and the mutual inductance fluctuation of the coupler is verified to be within 8.7% through simulation. Finally, a 500-W-level experimental prototype based on the WPT design is built and tested to verify the performance and effectiveness. The prototype achieves stable performance with an output power about 580 W and an 85% overall efficiency when the horizontal misalignment distance varies from 0 to 40 mm and the misalignment angle varies from 0 to 35°. © 2025 John Wiley & Sons Ltd.

关键词： Autonomous underwater vehicles

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Effect mechanism analysis of low-temperature on short-circuit robustness of SiC MOSFETs

Effect mechanism analysis of low-temperature on short-circui...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Pengkai Wang Yuan Chen Xinyu Zhu Hu He Junhui Li State Key Laboratory of Precision Manufacturing for Extreme Service Performance School of Mechanical and Electrical Engineering Central South University Changsha China National Key Laboratory of Science and Technology on Reliability Physics and Application of Electronic Component The China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China

ISBN: (数字)9798350360868

ISBN: (纸本)9798350360875

The performance of SiC MOSFETs in practical operational environments is challenged by multifaceted stress scenarios, encompassing thermal, mechanical, and electrical stress, which significantly influence their reliability and operational longevity. Consequently, a comprehensive exploration of aging precursors and failure mechanisms becomes imperative for the SiC MOSFETs under diverse stress interactions. This study focused on the impact of low- temperature storage (LTS) on short-circuit (SC) ruggedness through direct current characteristic tests (DC test), low- frequency noise tests (LFN), and failure analysis (FA) for 1.2 kV SiC MOSFETs. The outcomes revealed that LTS stress adversely affected short-circuit withstand time (SCWT). These findings provide insights into the reliability and operational lifespan of SiC MOSFETs under real-world operating conditions.

关键词： MOSFET Electron traps Temperature Silicon carbide Noise Failure analysis Logic gates

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3D Printed Integrated Gradient-Conductive MXene/CNT/Polyimide Aerogel Frames for Electromagnetic Interference Shielding with Ultra-Low Reflection

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Nano-Micro Letters 2023年第3期15卷 332-345页

作者： Tiantian Xue Yi Yang Dingyi Yu Qamar Wali Zhenyu Wang Xuesong Cao Wei Fan Tianxi Liu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua University2999 North Renmin RoadShanghai 201620People’s Republic of China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122People’s Republic of China Institute of Environmental Processes and Pollution Control School of Environment and Civil EngineeringJiangnan UniversityWuxi 214122People’s Republic of China NUTECH School of Applied Sciences&Humanities National University of TechnologyIslamabad 44000Pakistan

Construction of advanced electromagnetic interference(EMI)shielding materials with miniaturized,programmable structure and low reflection are promising but ***,an integrated transition-metal carbides/carbon nanotube/polyimide(gradient-conductive MXene/CNT/PI,GCMCP)aerogel frame with hierarchical porous structure and gradient-conductivity has been constructed to achieve EMI shielding with ultra-low *** gradient-conductive structures are obtained by continuous 3D printing of MXene/CNT/poly(amic acid)inks with different CNT contents,where the slightly conductive top layer serves as EM absorption layer and the highly conductive bottom layer as reflection *** addition,the hierarchical porous structure could extend the EM dissipation path and dissipate EM by multiple ***,the GCMCP aerogel frames exhibit an excellent average EMI shielding efficiency(68.2 dB)and low reflection(R=0.23).Furthermore,the GCMCP aerogel frames with miniaturized and programmable structures can be used as EMI shielding gaskets and effectively block wireless power transmission,which shows a prosperous application prospect in defense industry and aerospace.

关键词： 3D printing MXene/CNT/Polyimide aerogel Gradient-conductive Electromagnetic interference shielding

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Fault Feature Recognition Of Satellite Power System Based On Incremental Learning

Fault Feature Recognition Of Satellite Power System Based On...

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Prognostics and System Health Management Conference (PHM-Qingdao)

作者： Zhipeng Li YANG Yang Yanchen Dong Baolong Zhu Mingliang Suo School of Reliability and Systems Engineering Beihang University Beijing China No.31850 Unit People's Liberation Army of China Beijing China School of Information and Automation Engineering Qilu University of Technology (Shandong Academy of Sciences) Jinan China National Key Laboratory of Science and Technology on Reliability and Environmental Engineering Institute of Reliability Engineering School of Reliability and Systems Engineering Beihang University Beijing China

ISBN: (数字)9798350354010

ISBN: (纸本)9798350354027

In modern communications and technology, satellite power systems play a central role, and their reliability and fault diagnosis technology are increasingly important. Traditional fault diagnosis methods mainly include signal processing and model-based methods, but they are often inefficient and have limited accuracy when processing complex data sets. This paper proposes a feature selection algorithm based on incremental learning to improve the efficiency and accuracy of fault diagnosis. Its advantage is that it can only evaluate the newly added feature set without the need to reprocess the entire data set, thus optimizing the feature selection process and significantly improving the efficiency and response speed of the algorithm. In order to verify its effectiveness, this article selected 8 public data sets and 4 satellite power system simulation data sets for testing. Then, widely used algorithms are introduced to compare with the algorithm proposed in this article for a more comprehensive comparative analysis. By comparing the differences in running time and classification accuracy of the algorithms, it is concluded that the algorithm proposed in this article can significantly reduce the running time while maintaining or improving the classification effect, verifying the feasibility of the algorithm.

关键词： Fault diagnosis Satellites Accuracy Incremental learning Heuristic algorithms Power system dynamics Signal processing algorithms Feature extraction Classification algorithms Testing

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New Insight on Graphite Anode Degradation Induced by Li-Plating

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Energy & environmental Materials 2022年第3期5卷 872-876页

作者： Yongchuang Xiong Yan Liu Long Chen Songtong Zhang Xiayu Zhu Tengteng Shen Dongsheng Ren Xiangming He Jingyi Qiu Li Wang Qiao Hu Hao Zhang Research Institute of Chemical Defense Beijing 100191China Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

Graphite is the dominant anode material for lithium-ion batteries;however,it still suffers from Li-plating when charging fast or at low temperature,and Liplating is associated with performance fading and safety ***,we clarify the mechanism of lithium evolution from graphite particles by overlithiation cycle test,in-situ XRD,and titration gas *** observe that the graphite intercalation compounds(GICs,LiC_(12) and LiC_(6)e.g.)gradually become inactive and wrapped by dead lithium or side reaction sediments,while the rate of this degradation will be accelerated as the overpotential of Liplating is decreased after initial Li metal *** understanding is contradictory to the popular one that the degradation of graphite anode after Li plating is mainly caused by the inferior SEI and dead Li induced hindering of Li-ion *** isolation of lithiated graphite particles leading to the fast vanishing of Li insertion/deintercalation process in graphite *** further study the insertion/deintercalation vanishing process at low temperature and high rates,*** work provides a insight on graphite anode degradation induced by Li-plating,and the new understanding can be used to guide the design of advanced materials and electrodes to avoid Li-plating and achieve extreme fast while safe charging.

关键词： degradation graphite Li plating lithium-ion battery over-lithiation

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