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A Secure and Cost-Effective Training Framework Atop Serverless Computing for Object Detection in Blasting

Computer Modeling in Engineering & Sciences 2024年第5期139卷 2139-2154页

作者： Tianming Zhang Zebin Chen Haonan Guo Bojun Ren Quanmin Xie Mengke Tian Yong Wang Department of Computer and Science Shanghai Jiaotong UniversityShanghai200240China Aerospace System Engineering Shanghai Shanghai200240China State Key Laboratory of Precision Blasting Jianghan UniversityWuhan430056China Beijing Microelectronics Technology Institute Beijing100076China

The data analysis of blasting sites has always been the research goal of relevant *** rise of mobile blasting robots has aroused many researchers’interest in machine learning methods for target detection in the field of *** Computing can provide a variety of computing services for people without hardware foundations and rich software development experience,which has aroused people’s interest in how to use it in the field ofmachine *** this paper,we design a distributedmachine learning training application based on the AWS Lambda *** on data parallelism,the data aggregation and training synchronization in Function as a Service(FaaS)are effectively *** also encrypts the data set,effectively reducing the risk of data *** rent a cloud server and a Lambda,and then we conduct experiments to evaluate our *** results indicate the effectiveness,rapidity,and economy of distributed training on FaaS.

关键词： Serverless computing object detection blasting

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Investigation of Short-Circuit Failure Mechanism in 1.2kV SiC MOSFET 2

Investigation of Short-Circuit Failure Mechanism in 1.2kV Si...

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2nd IEEE International Power Electronics and Application Symposium, PEAS 2023

作者： Luo, Houcai Wu, Huan Zhang, Jingping Zheng, Bofeng Chen, Xianping Chongqing University Key Laboratory of Optoelectronic Technology and Systems Chongqing400044 China System Security and New Technology Chongqing University Key Laboratory of Optoelectronic Technology and Systems Education Ministry of China State Key Laboratory of Power Transmission Equipment Chongqing400044 China

ISBN: (纸本)9798350313765

The reliability and failure mechanism of SiC MOSFET under short-circuit was investigated using experiment and physical simulation in this paper. A short-circuit test platform was constructed, and a physical simulated model was calibrated. A commercial 1.2kV SiC MOSFET operated under different voltages including 200V, 400V, 600V with series short-circuit time was studied. The results showed that the thermal dissipation played a critical role during short-circuit operation, which is one of the most impacting factor to gate voltage and current tails. Two failed mechanisms including gate oxide degradation and parasitic BJT conduction failure were verified during short-circuit. This study may be helpful to the application engineering of SiC MOSFET. © 2023 IEEE.

关键词： experiment and physical simulation failure mechanism short-circuit SiC MOSFET

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A Unified Trajectory Optimization Approach for Long-Term and Reactive Motion Planning of Legged Locomotion

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Journal of Bionic Engineering 2023年第5期20卷 2108-2122页

作者： Yapeng Shi Bin Yu Kaixian Ba Mantian Li School of Mechanical Engineering Yanshan UniversityNo.438 West Hebei AvenueQinhuangdao066004HebeiPeople’s Republic of China State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin150001People’s Republic of China

This paper proposes a unified trajectory optimization approach that simultaneously optimizes the trajectory of the center of mass and footholds for legged *** on a generic point-mass model,the approach is formulated as a nonlinear optimization problem,incorporating constraints such as robot kinematics,dynamics,ground reaction forces,obstacles,and target *** unified optimization approach can be applied to both long-term motion planning and the reactive online planning through the use of model predictive control,and it incorporates vector field guidance to converge to the long-term planned *** effectiveness of the approach is demonstrated through simulations and physical experiments,showing its ability to generate a variety of walking and jumping gaits,as well as transitions between them,and to perform reactive walking in obstructed environments.

关键词： Legged locomotion Motion planning Trajectory optimization Bionic robot

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Boosting spring runoff into the sea by reservoir regulation and its potential for estuarine fishery recovery

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Science China Earth Sciences 2024年第5期67卷 1591-1603页

作者： Xiao WU Houjie WANG Yongyong FAN Naishuang BI Chiyuan MIAO Jingping XU Zuosheng YANG College of Marine Geosciences Key Laboratory of Submarine Geosciences and Prospecting Technologyand Frontiers Science Center for Deep Ocean Multispheres and Earth SystemOcean University of ChinaQingdao 266100China Laoshan National Laboratory Qingdao 266061China Institute of the Yellow River Estuary and Coast Science Dongying 257000China State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Department of Ocean Science&Engineering Southern University of Science and TechnologyShenzhen 518055China

With global surge in reservoir construction over the past decades,river systems worldwide have been profoundly ***,flow manipulation by reservoirs has altered the natural hydrological processes,resulting in extensive modifications of fluvial-marine *** the adverse ecological consequences of reservoirs has become a global concern and has garnered increasing *** Yellow River,as one of the most extensively manipulated river systems globally,has experienced substantial changes in the amount and timing of water discharge due to the presence of numerous reservoirs scattered throughout its catchment *** alterations have caused physicochemical changes in the estuary and subsequent modifications to the estuarine *** recent years,the Yellow River Conservancy Committee initiated the release of water through the Xiaolangdi Dam during the major spawning period of fisheries,specifically in the spring,with the aim of improving the estuarine ecological *** 2011 to 2020,a total of 84.05 km^(3)of water was discharged from the Xiaolangdi Reservoir during spring seasons,of which 40%(33.16 km^(3))constituted water impounded within the reservoir during preceding ***,the spring water discharge from the Yellow River to the sea increased significantly from 1.50 km^(3)/yr to 3.46 km^(3)/yr in the past decade,leading to a decrease in estuarine salinity by 1.6 *** estuarine fishery resources,such as fish eggs in the Yellow River estuary,have demonstrated evident *** reservoir regulation in the Yellow River,which has successfully enhanced spring water discharge and subsequently restored estuarine fishery resources,presents an effective attempt for mitigating the adverse ecological effects associated with reservoirs.

关键词： Reservoir regulation Water release Spring runoff Estuarine ecosystem Yellow River

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Control, Modeling and Stability Analysis of DRU-based Grid-forming Converter

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Chinese Journal of Electrical Engineering 2025年第1期11卷 83-92页

作者： Wencong Wu Minzhi Wang Liang Tu Haiqing Cai Guanglei Yan Xiaohui Qu Haohan Gu Wei Chen State Key Laboratory of HVDC China Southern Power GridGuangzhou 510663China National Energy Power Grid Technology R&D Center Guangzhou 510663China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power Systems China Southern Power GridGuangzhou 510663China CSG Key Laboratory for Power System Simulation China Southern Power GridGuangzhou 510663China School of Electrical Engineering Southeast UniversityNanjing 210096China

Diode rectifier unit(DRU)-based high-voltage direct current(HVDC)transmissionsystems areeffectivein achieving the stableandeconomical operation of offshore *** theuncontrollable characteristicsof DRUs,a grid-forming(GFM)strategy forwind-turbine converters isnecessary to support offshore AC voltageand ***,the active power-synchronization control in traditional GFM converters is unsuitable for DRU-based GFM ***,the stability issue for DRU-based HVDC systems involving DRU-based GFM and grid-following(GFL)converters has not yet been *** solve these issues,this study begins with the characteristics of a DRU-based HVDC system and presents a control scheme for DRU-based GFM converters for power ***,the dq-frame impedance model of the DRU-based GFM converteris proposed for the stability analysis of the entire HVDC ***,a simulation platform is built to verify the model accuracy and system stability.

关键词： Diode rectifier unit offshore wind-powergeneration grid-forming converter impedance model stabilityanalysis

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Research on Global Temperature Rise Characteristics of Hysteresis Motor Based on Dynamic Loss Model 1

引用

17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Li, Shaolin Xu, Qiwei Wang, Qian State Key Laboratory of Mechanical Transmissions Chongqing University Chongqing400044 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China

ISBN: (数字)9789819904518

ISBN: (纸本)9789819904501

Hysteresis motors are widely used in gyroscopes due to their self-starting capability, high starting torque and simple geometry, and are key components to ensure the normal on-orbit operation of satellites or launch vehicles. The drift caused by the temperature change will have a great impact on the accuracy of the instrument, so it is necessary to study the global temperature rise of the hysteresis motor. Motor loss is the main heat source in motor operation, and improving its calculation accuracy is the premise to ensure the accuracy of global temperature rise. However, different from the traditional motor, the nonlinearity of the hysteresis material of the hysteresis motor and the complexity of the starting process make its analysis difficult. This paper firstly proposes a method to determine the working hysteresis loop through Preisach model. Based on this, the loss calculation model of the hysteresis motor is deduced and verified by simulation. Finally, the result of loss model is used as the heat source, and the global temperature rise characteristics of the motor are studied. The temperature distribution rules and design points of key structures are obtained, which has certain reference significance for the thermal design of hysteresis motors. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Temperature distribution

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Gas production mechanism of Irgamet 39 and its long‐term corrosion resistance

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High Voltage 2023年第5期8卷 931-942页

作者： Huiying Xiang Yuan Yuan Guoyong Liu Xue Gao Cheng Zhang Jiang Zhou Ruijin Liao College of Materials Science and Engineering Chongqing UniversityChongqingChina State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina Dongfang Electric Machinery Co. LtdDeyangChina

The phenomenon of transformer failure caused by oil‐sulphur corrosion of oil₋paper insulation system has always been concerned by *** 39 is the most used metal passivator for inhibiting sulphur ***,Irgamet 39 causes abnormal dissolved gas in oil during the process of exerting anti‐corrosion ***,the gas production mechanism of Irgamet 39 and its long‐term corrosion resistance were *** with other metal passivators,the Irgamet 39 produces more dissolved gases in oil,especially H_(2),CO and CO_(2).The main sources of free radicals in the gas production process are from the branched chains of the Irgamet 39 structure(−CH_(2)N(C_(8)H_(17))_(2)and−CH_(3)).Furthermore,the ageing products of insulating paper and oil promote the cleavage of the chain in the Irgamet 39 molecule,which then causes Irgamet 39 to generate more dissolved *** 39 exhibits excellent long‐term corrosion inhibition properties,while it also leads to abnormal gases in the oil,which can affect the interpretation of the dissolved gas analysis data and thus interfere with the *** work provides useful information for the practical application of Irgamet 39 and helps electrical workers make reasonable predictions for transformer problems.

关键词： corrosion resistance mechanism

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S2H-GNN: Learning Soft to Hard Feature Matching with Sparsified Graph Neural Network

S2H-GNN: Learning Soft to Hard Feature Matching with Sparsif...

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2023 IEEE International Conference on Real-Time Computing and robotics, RCAR 2023

作者： Xie, Tao Li, Ruifeng Jiang, Zhiqiang Dai, Kun Wang, Ke Zhao, Lijun Li, Shuozhan Harbin Institute of Technology State Key Laboratory of Robotics and System Harbin150006 China -HIT Research Institute of Engineering and Technology Quanzhou China

ISBN: (纸本)9798350327182

In this work, we introduce a soft-to-hard network (S2H-GNN) for precise local feature matching between image pairs. The core of S2H-GNN is a weighted context aggregation algorithm that enables nodes to receive information from their neighbors in order to form a more global understanding. S2HGNN leverages a sparsified graph neural network to enhance the features, consisting of the following modules alternately: (1) Inducing Point Initial Module that uses cosine correlation to identify highly scored keypoints as Inducing points. (2) Message Passing Module that integrates the features of original keypoints into those of Inducing points, which are further leveraged to exchange messages through self attention and cross attention. (3) Attention Upsample Module that propagates the feature of Inducing points to that of original keypoints, obtaining discriminative feature representation. Additionally, we propose an assignment layer to obtain a soft assignment matrix, which views feature matching as a graphy matching problem. Finally, we introduce a novel gap loss to guide S2H-GNN in learning a discriminative cognition of matching and non-matching keypoints, ultimately obtaining the hard assignment matrix. Experimental results demonstrate that S2H-GNN achieves comparable or higher performance in image matching and homography estimation tasks. © 2023 IEEE.

关键词： Graph neural networks

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Models and Methods for Planning Hydrogen Supply Chain systems

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CSEE Journal of Power and Energy systems 2024年第6期10卷 2517-2527页

作者： Han Liu Jing Ma Research Institute of Emergency Science China Coal Research Institute CCRIChina Coal Technology&Engineering Group(CCTEG)Beijing 100013China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China

Hydrogen is becoming an important candidate for replacing fossil fuels in the future energy *** such,efficient hydrogen supply chain system planning and the promotion of its large-scale civilian and commercial applications are *** identify research gaps in the field,this study reviews models and methods for planning hydrogen supply chain systems that have been employed over the past 15 *** decision aspects and objectives in the hydrogen supply system are ***,problem types,modeling techniques and solution methods are analyzed and classified based on their individual ***,potential directions promoted by economic factors are recommended for future research.

关键词： Hydrogen planning model supply chain system solution method

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A Valuable and Low-Budget Process Scheme of Equivalized 1 nm technology Node Based on 2D Materials

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Nano-Micro Letters 2025年第8期17卷 294-305页

作者： Yang Shen Zhejia Zhang Zhujun Yao Mengge Jin Jintian Gao Yuhan Zhao Wenzhong Bao Yabin Sun He Tian College of Integrated Circuit Science and Engineering Shanghai Key Laboratory of Multidimensional Information ProcessingEast China Normal UniversityShanghai 200241People’s Republic of China Institute of Microelectronics and Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijing 100084People’s Republic of China State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433People’s Republic of China Shaoxin Laboratory Shaoxing 312000People’s Republic of China

Emerging two-dimensional(2D)semiconductors are among the most promising materials for ultra-scaled transistors due to their intrinsic atomic-level *** the stacking process advances,the complexity and cost of nanosheet field-effect transistors(NSFETs)and complementary FET(CFET)continue to *** 1 nm technology node is going to be based on Si-CFET process according to international roadmap for devices and systems(IRDS)(2022,https://***/),but not publicly confirmed,indicating that more possibilities still *** miniaturization advantage of 2D semiconductors motivates us to explore their potential for reducing process costs while matching the performance of next-generation nodes in terms of area,power consumption and *** this study,a comprehensive framework is built.A set of MoS2 NSFETs were designed and fabricated to extract the key parameters and *** then for benchmarking,the sizes of 2D-NSFET are scaled to a extent that both of the Si-CFET and 2D-NSFET have the same average device *** these conditions,the frequency of ultra-scaled 2D-NSFET is found to improve by 36%at a fixed power *** work verifies the feasibility of replacing silicon-based CFETs of 1 nm node with 2D-NSFETs and proposes a 2D technology solution for 1 nm nodes,i.e.,“2D eq 1 nm”*** the same time,thanks to the lower characteristic length of 2D semiconductors,the miniaturized 2D-NSFET achieves a 28%frequency increase at a fixed power ***,developing a standard cell library,these devices obtain a similar trend in 16-bit RISC-V *** work quantifies and highlights the advantages of 2D semiconductors in advanced nodes,offering new possibilities for the application of 2D semiconductors in high-speed and low-power integrated circuits.

关键词： Two-dimensional semiconductors 1 nm technology node Nanosheet field-effect transistors Complementary field-effect transistors Horizontal scaling

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