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On Designs of Decentralized Reputation Management for Permissioned Blockchain Networks

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 1755-1773页

作者： jinyu Chen Long Shi Qisheng Huang Taotao Wang Daojing He School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing210094China School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen518055China College of Electronics and Information Engineering Shenzhen UniversityShenzhen518060China School of Computer Science and Technology Harbin Institute of TechnologyShenzhen518055China

In permissioned blockchain networks,the Proof of Authority(PoA)consensus,which uses the election of authorized nodes to validate transactions and blocks,has beenwidely advocated thanks to its high transaction throughput and fault ***,PoA suffers from the drawback of centralization dominated by a limited number of authorized nodes and the lack of anonymity due to the round-robin block proposal *** a result,traditional PoA is vulnerable to a single point of failure that compromises the security of the blockchain *** address these issues,we propose a novel decentralized reputation management mechanism for permissioned blockchain networks to enhance security,promote liveness,and mitigate centralization while retaining the same throughput as traditional *** paper aims to design an off-chain reputation evaluation and an on-chain reputation-aided ***,we evaluate the nodes’reputation in the context of the blockchain networks and make the reputation globally verifiable through smart ***,building upon traditional PoA,we propose a reputation-aided PoA(rPoA)consensus to enhance securitywithout sacrificing *** particular,rPoA can incentivize nodes to autonomously form committees based on reputation authority,which prevents block generation from being tracked through the randomness of reputation ***,we develop a reputation-aided fork-choice rule for rPoA to promote the network’s ***,experimental results show that the proposed rPoA achieves higher security performance while retaining transaction throughput compared to traditional PoA.

关键词： Blockchain reputation management PoA throughput security decentralization

The mobility of two-dimensional electron gas in AlGaN/GaN heterostructures with varied Al content

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Science in China(Series F) 2008年第6期51卷 780-789页

作者： ZHANG JinFeng HAO Yue ZHANG JinCheng NI jinyu Key Laboratory of the Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices School of Microelectronics Xidian University Xi'an 710071 China

The mobility of the two-dimensional electron gas （2DEG） in AIGaN/GaN hetero-structures changes significantly with AI content in the AIGaN barrier layer, while few mechanism analyses focus on it. Theoretical calculation and analysis of the 2DEG mobility in AIGaN/GaN heterostructures with varied AI content are carried out based on the recently reported experimental data. The 2DEG mobility is modeled analytically as the total effects of the scattering mechanisms including acoustic deformation-potential, piezoelectric, polar optic phonon, alloy disorder, interface roughness, dislocation and remote modulation doping scattering. We show that the increase of the 2DEG density, caused by the ascension of the AI content in the barrier layer, is a dominant factor that leads to the changes of the individual scat- tering processes. The change of the 2DEG mobility with AI content are mainly determined by the interface roughness scattering and the alloy disorder scattering at 77 K, and the polar optic phonon scattering and the interface roughness scattering at the room temperature. The calculated function of the interface roughness pa- rameters on the AI content shows that the stress caused AIGaN/GaN interface degradation at higher AI content is an important factor in the limitation of the in- terface roughness scattering on the 2DEG mobility in AIGaN/GaN heterostructures with high AI content.

关键词： GaN heterostructures 2DEG mobility

BMTK： a toolkit for determining modules in biological bipartite networks

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Frontiers of Electrical and Electronic Engineering in China 2018年第2期6卷 186-192页

作者： Bei Wang jinyu Chen Shihua Zhang NCMIS CEMS RCSDS Academy of Mathematics and Systems Science Chinese Academy of Sciences School of Mathematical Sciences University of Chinese Academy of Sciences Beijing 100049 China

Background： Module detection is widely used to analyze and visualize biological networks. A number of methods and tools have been developed to achieve it. Meanwhile, bipartite module detection is also very useful for mining and analyzing bipartite biological networks and a few methods have been developed for it. However, there is few user- friendly toolkit for this task. Methods： To this end, we develop an online web toolkit BMTK, which implements seven existing methods. Results： BMTK provides a uniform operation platform and visualization function, standardizes input and output format, and improves algorithmic structure to enhance computing speed. We also apply this toolkit onto a drug-target bipartite network to demonstrate its effectiveness. Conclusions： BMTK will be a powerful tool for detecting bipartite modules in diverse bipartite biological networks. Availability： The web application is freely accessible at http：//***/BMTK.

关键词： network biology module detection biological bipartite networks

Heat Pumps in Denmark:Current Situation in Providing Frequency Control Ancillary Services

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CSEE Journal of Power and Energy Systems 2022年第3期8卷 769-779页

作者： menglin Zhang Qiuwei Wu Theis Bo Harild Rasmussen Xiaodong Yang jinyu Wen Department of Electrical Engineering Centre for Electric Power and EnergyTechnical University of DenmarkKgs.LyngbyDenmark State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China

-The Danish government set an ambitious goal to achieve a fully renewable-based energy system by *** this context,the integrated electricity and heating system is undergoing rapid development in Denmark as a promising way to accommodate the ever-growing renewable energy sources(RESs).The electric heat pumps(HPs),coupled with the power and heat sectors,can propagate the flexibility on the heat consumer side to the power system operations,playing an important role of improving system flexibility and balancing the variability of the *** this paper,the current development situation of HPs in Denmark is analyzed,including both the large-scale HPs in the district heating system and individual HPs on the residential *** possibility of using HPs to provide frequency control ancillary service(FCAS)is analyzed according to the market and technical requirements of the FCAS in the Danish transmission system and experimental results of representative demonstration projects of HPs.A comprehensive analysis of the advantages,barriers,future prospects,and challenges for using HPs to provide the FCAS are carried out from the perspectives of different entities.

关键词： Danish energy system frequency control ancillary service individual heat pumps integrated electricity and heat system large-scale heat pumps power to heat

The design and fault ride through control of un-interrupted DC-DC Autotransformer

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Science China(Technological Sciences) 2018年第12期61卷 1935-1949页

作者： LI mengBo XIANG Wang ZUO WenPing YAO LiangZhong LIN WeiXing WEN jinyu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Renewable Energy Department China Electric Power Research Institute TBEA China Xinjiang Sunoasis Co. Ltd

This paper proposed a novel type of DC-DC converter, termed as un-interrupted DC Autotransformer(un-interrupted DC AUTO), which has the capability to ride through DC fault on either side of the converter without blocking any devices. Besides that, the adequately designed converter retains the advantages of DC AUTO technology, namely reduced investment cost and transmission loss. To begin with, the topology and basic attributes of the un-interrupted DC AUTO are illustrated. Then the design goals and the corresponding design procedures are analyzed. Furthermore, an effective control system is proposed to enable the converter steady operation during both normal and faulted conditions. Finally, a 1000 MW ±320 kV/±640 kV test system is built on PSCAD/EMTDC platform to verify the technical feasibility of the proposed converter and the effectiveness of the control strategy.

关键词： DC-DC power conversion DC Autotransformer HVDC converters DC fault control strategy

Double-pass grating imaging spectrometer

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Chinese Optics Letters 2019年第1期17卷 43-46页

作者： Xin meng Zhongming Yang jinyu Du Guobin Fan Science and Technology on Electronic Test & Measurement Laboratory The 41st Research Institute of CETC School of Information Science & Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application Shandong University Institute of Applied Electronics China Academy of Engineering Physics

A double-pass grating imaging spectrometer is proposed and demonstrated. The traditional entrance slit is replaced by a middle reflective slit, which is used as a spectral filter rather than a spatial filter. The light from the scene passes through the same dispersive grating twice. The full image of the scene can be obtained with a snapshot. Therefore, the stripe noise and image distortion caused by image mosaicking can be ***, the target is easier to be captured and focused, just like using a camera. This method can be used to obtain clearer spectral images of the scene conveniently and quickly.

关键词： Double-pass imaging spectrometer

CONSTRUCTION OF IMPROVED BRANCHING LATIN HYPERCUBE DESIGNS

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Acta Mathematica Scientia 2021年第4期41卷 1023-1033页

作者： Hao CHEN jinyu YANG Min-Qian LIU School of Statistics Tianjin University of Finance and EconomicsTianjin 300222China School of Statistics and Data Science LPMC&KLMDASRNankai UniversityTianjin 300071China

In this paper,we propose a new method,called the level-collapsing method,to construct branching Latin hypercube designs(BLHDs).The obtained design has a sliced structure in the third part,that is,the part for the shared factors,which is desirable for the qualitative branching *** construction method is easy to implement,and(near)orthogonality can be achieved in the obtained BLHDs.A simulation example is provided to illustrate the effectiveness of the new designs.

关键词： Branching and nested factors computer experiment Gaussian process model orthogonality

Optimization of multi-state generation problem based on spatial information network topology

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High-Confidence Computing 2023年第1期3卷 58-65页

作者： Peng Yang JiaYing Zhang Shijie Zhou jinyu Zhou School of Information and Software Engineering University of Electronic Science and Technology of ChinaChengdu 610054China School of Mathematical Sciences University of Electronic Science and Technology of ChinaChengdu 611731China

Spatial information network is a kind of satellite network with high speed node movement and fast dynamic topology *** the increasing number of low-orbit satellites,the research on the subnets topology and dynamic optimization of space information networks has become an important direction to study the destructibility of spatial information *** this paper,two common objective functions in inter-satellite link assignment,network observation position and network communication factor are studied,and a multi-objective optimization model is *** first search,simulated annealing,NSGA-II and adaptive optimization simulated annealing were used to analyze and solve the *** comparing the solving efficiency of the model through simulation experiments,the difference of the results caused by the four algorithms is verified.

关键词： Spatial information network Simulated annealing NSGA-II

Analysis of Metro Station Ridership Considering Spatial Heterogeneity

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Chinese Geographical Science 2019年第6期29卷 1065-1077页

作者： GAN Zuoxian FENG Tao YANG Min Harry TIMMERMANS LUO jinyu Jiangsu Key Laboratory of Urban ITS Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic TechnologiesSchool of TransportationSoutheast UniversityNanjing 211189China Urban Planning Group Eindhoven University of TechnologyEindhoven 5600MBThe Netherlands

This study aims to explore the role of spatial heterogeneity in ridership analysis and examine the relationship between built environment, station attributes and urban rapid transit ridership at the station *** spatial heterogeneity has been widely acknowledged in spatial data analysis, it has been rarely considered in travel behavior *** models(three global models-ordinary least squares(OLS), spatial lag model(SLM), spatial error model(SEM) and one local model-geographically weighted regression(GWR) model) are estimated separately to explore the relationship between various independent variables and station ridership, and identify the influence of spatial *** the data of built environment and station characteristics, the results of diagnostic identify evidence the existence of spatial heterogeneity in station ridership for the metro network in Nanjing, *** of comparing the various goodness-of-fit indicators show that, the GWR model yields the best fit of the data, performance followed by the SEM, SLM and OLS *** results also demonstrate that population, number of lines, number of feeder buses, number of exits, road density and proportion residential area have a significant impact on station ***, the study pays special attention to the spatial variation in the coefficients of the independent variables and their statistical *** underlines the importance of taking spatial heterogeneity into account in the station ridership analysis and the decision-making in urban planning.

关键词： spatial heterogeneity rapid transit ridership built environment station level spatial models