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Using Event-Based Method to Estimate Cybersecurity Equilibrium

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IEEE/CAA Journal of Automatica Sinica 2021年第2期8卷 455-467页

作者： Zhaofeng Liu Ren Zheng Wenlian Lu Shouhuai Xu the School of Mathematical Sciences Fudan UniversityShanghai 200433China the Artificial Intelligence Laboratory SAIC Motor Corporation LimitedShanghai 200041 saic Intelligent Technology(Shanghai)corporation limited Shanghai 200433China the School of Mathematical Sciences Fudan Universityand Shanghai Center for Mathematical SciencesFudan Universityand also with Shanghai Key Laboratory for Contemporary Applied MathematicsShanghai 200433China the Department of Computer Science University of Texas at San AntonioSan Antonio TX 78249 USA

Estimating the global state of a networked system is an important problem in many application *** classical approach to tackling this problem is the periodic(observation)method,which is inefficient because it often observes states at a very high *** inefficiency has motivated the idea of event-based method,which leverages the evolution dynamics in question and makes observations only when some rules are triggered(i.e.,only when certain conditions hold).This paper initiates the investigation of using the event-based method to estimate the equilibrium in the new application domain of cybersecurity,where equilibrium is an important metric that has no closed-form *** specifically,the paper presents an event-based method for estimating cybersecurity equilibrium in the preventive and reactive cyber defense dynamics,which has been proven globally *** presented study proves that the estimated equilibrium from our trigger rule i)indeed converges to the equilibrium of the dynamics and ii)is Zeno-free,which assures the usefulness of the event-based *** examples show that the event-based method can reduce 98%of the observation cost incurred by the periodic *** order to use the event-based method in practice,this paper investigates how to bridge the gap between i)the continuous state in the dynamics model,which is dubbed probability-state because it measures the probability that a node is in the secure or compromised state,and ii)the discrete state that is often encountered in practice,dubbed sample-state because it is sampled from some *** bridge may be of independent value because probability-state models have been widely used to approximate exponentially-many discrete state systems.

关键词： Cybersecurity dynamics cybersecurity equilibrium event-based method global state estimation preventive and reactive cyber defense dynamics

Study on load performance of electric motor system used in hybrid electric vehicle

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High Technology Letters 2010年第1期16卷 63-66页

作者：李雯 Zhang Chengning Wang Zhifu Gao Lei National Engineering Laboratory for Electric Vehicle Beijing Institute of Technology Beijing 100081 P.R. China New Energy Vehicle Division saic motor corporation limited Shanghai 201804 P.R. China

The performance of the power assist, global optimization solved by dynamic programming （DP） method, Chery and Insight control strategies are analyzed using the mild parallel hybrid electric vehicle （PHEV） model based on Insight structure. The influence of the four control strategies to the load power of the electric motor system used on parallel hybrid electric vehicle is studied. It is found that 80 percent of the motor load power points are under 1/5 of the electric peak power. The motor load power of the power assist control strategy is distributed in the widest range during generating operation, and the motor load power of the global optimization control strategy has the smallest one.

关键词： parallel hybrid electric vehicle (PHEV) management strategy motor load power

Semantic Segmentation-Based Road Marking Detection Using Around View Monitoring System

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Journal of Shanghai Jiaotong university(Science) 2022年第6期27卷 833-843页

作者： XU Hanqing YANG Ming DENG Liuyuan LI Hao WANG Chunxiang HAN Weibin YU Yuelong School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China SJTU-ParisTech Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai 200240China saic motor corporation limited Shanghai 200041China

Road marking detection is an important branch in autonomous driving,understanding the road *** recent years,deep-learning-based semantic segmentation methods for road marking detection have been arising since they can generalize detection result well under complicated environments and hold rich pixel-level semantic ***,the previous methods mostly study the training process of the segmentation network,while omitting the time cost of manually annotating pixel-level ***,the pixel-level semantic segmentation results need to be fitted into more reliable and compact models so that geometrical information of road markings can be explicitly *** order to tackle the above problems,this paper describes a semantic segmentation-based road marking detection method using around view monitoring system.A semiautomatic semantic annotation platform is developed,which exploits an auxiliary segmentation graph to speed up the annotation process while guaranteeing the annotation accuracy.A segmentation-based detection module is also described,which models the semantic segmentation results for the more robust and compact *** proposed detection module is composed of three parts:vote-based segmentation fusion filtering,graph-based road marking clustering,and road-marking *** under various scenarios show that the semantic segmentation-based detection method can achieve accurate,robust,and real-time detection performance.

关键词： autonomous driving semantic segmentation road marking detection

EMC Analysis of High and Low Voltage Wiring Spacing for New Energy Vehicles

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EMC Analysis of High and Low Voltage Wiring Spacing for New ...

Research and Application of Vehicle Dynamic Interference Method

2021中国汽车工程学会年会暨展览会

作者： Wang Hongwu saic motor corporation limited CO.Technical Centre

With the gradual improvement of vehicle electrification level,the layout and wiring of electrical parts are facing unprecedented *** performance becomes a key performance indicator after the continuous compression of the spacing between electrical *** for new energy vehicles,there are both high and low voltage *** the high and low voltage coupling is not handled well,EMC problems will occur *** paper focuses on the EMC analysis of the high and low voltage wiring spacing of new energy vehicles,and makes a comprehensive analysis from the aspects of theory,standard,simulation and test,and gives relevant wiring spacing suggestions.

关键词： wiring spacing high-low voltage coupling EMC

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Research and Application of Vehicle Dynamic Interference Met...

Research on Evaluation Methodology of Durability of the Plastic Tray System for Battery

2021中国汽车工程学会年会暨展览会

作者： Duan Junjie Zhou Jieliang Chen Wei Wu Xiaohuan Sun Chengzhi Wang Guangyao Lou Zhenliang Technical Center SAIC Motor Corporation Limited Passenger Vehicle Company

Body dynamic interference is one of the common phenomena in the process of vehicle road *** is easy to cause sensitive and disgusting problems such as knock off paint,friction deformation,noise and so *** on the principle of direct method,this paper studies the theory of multi degree of freedom forced vibration,the algorithm and process of time-domain transient response analysis,and puts forward a dynamic interference method for vehicle body,which adopts the self-developed DIA（dynamic interference）*** load input,modeling analysis,diagnosis and optimization of the system are carried out,and the system is applied to the trunk lid system to identify and optimize the problem more *** method can be extended to the prediction of dynamic interference among vehicle,subsystem and parts.

关键词： dynamic interference phenomenon DIA system problem identification prediction

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Research on Evaluation Methodology of Durability of the Plas...

General Torsional Stiffness Matching of Off-road Vehicle

2019中国汽车工程学会年会

作者： Duan Junjie Mei Hailong Wang Guangyao Sun Chengzhi Zhang Shizhan Technical Center SAIC Motor Corporation Limited Passenger Vehicle Company

We study the evaluation method of durability of the plastic tray system for battery mainly based on the background of the battery tray gradually transforming from metal parts to plastic *** of the plastic tray system for battery refers to the ability to maintain good quality for a long time which is usually characterized by service *** the impact of vehicle load and climatic factors such as temperature and humidity repeatedly,the performance index of battery plastic system will gradually *** paper proposes that the modal is used as the main index to evaluate the durability of the plastic tray system for battery based on the study of acceleration power spectrum density and resonance mechanism of typical vehicles,and we compare the CAE analysis results with the local modal experimental results of the plastic tray ***,the standardized modeling method of the plastic tray system is formed,and the modal target of durability of the plastic tray system for battery is preliminarily determined.

关键词： plastic tray system modal durability modeling method

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Chinese Journal of Mechanical Engineering 2009年第3期22卷 331-335页

作者： HUANG Song Dongfeng motor corporation Wuhan 430056 China

Increasing frame torsional stiffness of off-road vehicle will lead to the decrease of body torsional deformation, but the increase of torsional loads of frame and suspension system and the decrease of wheel adhesive weight. In severe case, a certain wheel will be out of contact with road surface. Appropriate matching of body, frame and suspension torsional stiffnesses is a difficult problem for off-road vehicle design. In this paper, these theoretically analytic models of the entire vehicle, body, frame and suspension torsional stiffness are constructed based on the geometry and mechanism of a light off-road vehicle＇s body, frame and suspension. The body and frame torsional stiffnesses can be calculated by applying body CAE method, meanwhile the suspension＇s rolling angle stiffness can be obtained by the bench test of the suspension＇s elastic elements. Through fixing the entire vehicle, using sole timber to raise wheels to simulate the road impact on a certain wheel, the entire vehicle torsional stiffness can be calculated on the geometric relation and loads of testing. Finally some appropriate matching principles of the body, frame and suspension torsional stiffness are summarized according to the test and analysis results. The conclusion can reveal the significance of the suspension torsional stiffness on off-road vehicle＇s torsion-absorbing capability. The results could serve as a reference for the design of other off-road vehicles.

关键词： off-road vehicle bodywork frame suspension system torsional stiffness matching

Research on cognitive load evaluation with subjective method in manual assembly

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High Technology Letters 2023年第4期29卷 434-444页

作者：任彬 ZHOU Qinyu LI Qibing LUO Wenfa Shanghai Key Laboratory of Intelligent Manufacturing and Robotics School of Mechatronic Engineering and AutomationShanghai UniversityShanghai 200444P.R.China Zhejiang Key Laboratory of Robotics and Intelligent Manufacturing Equipment Technology Ningbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201P.R.China saic motor R&D Innovation Headquarters SAIC Motor Corporation LimitedShanghai 201804P.R.China

Subjective scales have different kinds of applicability in diverse *** study intends to implement a quantitative approach to determine the applicability of subjective scales in manual as-sembly work and evaluate the cognitive load of assembly workers.A multi-scale research paradigm based on subjective evaluation method is *** typical task stages are extracted from the process of assembly *** National Aeronautics and Space Administration Task Load Index(NASA-TLX)scale,PAAS scale and Workload Profile Index Ratings(WP)scale are selected for the design of 3×3 multi-factor mixed *** power spectrum density(PSD)characteris-tics of electroencephalogram(EEG)are utilized to identify the difficulty levels of the three task *** relevant indicators of scale applicability are *** results show that in terms of sensitivity,NASA-TLX scale reaches the highest sensitivity(F=999.137,P=0<0.05).In terms of validity,NASA-TLX scale possesses the best concurrent validity(P=0.0255<0.05).In terms of diagnosticity,NASA-TLX scale based on 6 dimensions takes on the best diagnostic *** terms of subject acceptability,WP scale performs the *** to the analytic hierarchy process(AHP)model,the applicability scores of NASA-TLX scale,PAAS scale and WP scale are determined as 3,2.55 and 1.6714,***,NASA-TLX scale is regarded as the most suitable subjective evaluation questionnaire for assembly workers,which is also an effective quantitative evaluation method for the cognitive load of assembly workers.

关键词： assembly worker electroencephalogram(EEG) analytic hierarchy process(AHP) National Aeronautics and Space Administration Task Load Index(NASA-TLX)scale subjective evaluation scale applicability

Unexpected Kirkendall effect in twinned icosahedral nanocrystals driven by strain gradient

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Nano Research 2020年第10期13卷 2641-2649页

作者： Jingbo Huang Yucong Yan Xiao Li Xurong Qiao Xingqiao Wu Junjie Li Rong Shen Deren Yang Hui Zhang State Key Laboratory of Silicon Materials School of Materials Science&EngineeringCyrus Tang Center for Sensor Materials and ApplicationsZhejiang UniversityHangzhou 310027China Advanced Technology Department SAIC Motor Corporation LimitedShanghai 201804China State Key Laboratory of Heary Oil Proessing School of Materials Science and EngineeringChina University of PetroleumQingdao 266580China

Nanoscale Kirkendall effect has been widely used for rationally fabricating high-quality hollow nanocrystals, but often requires the intrinsic diffusion coefficient of out-diffusion materials higher than that of in-diffusion components. Here we demonstrate an unexpected Kirkendall effect that occurs in diffusing intrinsically faster Cu atoms into Pd icosahedra, leading to the formation of PdCu alloyed hollow nanocrystals. The control experiment with Pd octahedra replacing icosahedra indicates the critical role of twin boundaries in facilitating such unexpected Kirkendall effect. In addition, geometric phase analysis and density functional theory calculation show that out-diffusion of Pd atoms in the icosahedra is faster than in-diffusion of Cu atoms, particularly through the twin boundaries, upon the strain gradient with an inward distribution from tensile to compressive strains. The unexpected Kirkendall effect is also found in the interdiffusion of Ag and Pd atoms in Pd icosahedra. Our finds break the limitation of the intrinsic diffusion coefficient for the synthesis of hollow nanocrystals through Kirkendall effect and are expected to enormously enrich the family of hollow nanocrystals which have shown great potential in broad areas, such as fine chemical production, energy storage and conversion, and environmental protection. This work also provides a deep understanding in the diffusion behavior of atoms upon the strain gradient.

关键词： Kirkendall effect diffusion coefficient interdiffusion chemical potential icosahedral nanocrystals strain gradient