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domain-Oriented Software defined Computing Architecture

China Communications 2019年第6期16卷 162-172页

作者： Ping Lv Qinrang Liu Hongchang Chen Ting Chen National Digital Switching System Engineering and Technical R&D Center

With the introduction of software defined hardware by dArPA Electronics resurgence Initiative,software definition will be the basic attribute of information *** from boundary certainty and algorithm aggregation of domain applications,domain-oriented computing architecture has become the technical direction that considers the high flexibility and efficiency of information *** at the characteristics of data-intensive computing in different scenarios such as Internet of Things(IoT),big data,artificial intelligence(AI),this paper presents a domain-oriented software defined computing architecture,discusses the hierarchical interconnection structure,hybrid granularity computing element and its computational kernel extraction method,finally proves the flexibility and high efficiency of this architecture by experimental comparison.

关键词： software defined hardware software defined computing architecture hierarchical interconnection mixed-granular computing element

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Lightweight and fast coordinated update algorithm for hybrid SdN networks 4th

Lightweight and fast coordinated update algorithm for hybrid...

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4th International Conference on Intelligent Computing, Communication and devices, ICCd 2018

作者： Yu, Changhe Lan, Julong Hu, Yuxiang National Digital Switching System Engineering & Technological R&D Center Zheng Zhou450002 China

ISBN: (纸本)9789811394058

Hybrid software-defined networking (SdN) networks are intermediates between traditional networks and SdN networks. However, since the hybrid control planes are structurally different from the single control plane, updating the hybrid SdN networks lacks effective techniques. In this paper, by utilizing the segment routing (Sr) mechanism to update hybrid SdN networks and formalize the application of Sr during updates, we propose a cooperative consistency update algorithm that can coordinate Sr, two-phase commit techniques. The algorithm is capable of preserving consistency with low overhead and excellent applicability. When a network requires updating, the algorithm leverages the Sr mechanism to stitch a new path using the available path segments;thus, flows can use the new path immediately. If the update cannot be completed with the Sr mechanism alone, the algorithm can utilize the two-phase commit technique to update the nodes through duplication. Notably, our experiments based on real topologies indicate that, compared to prior techniques, the proposed algorithm can greatly reduce the TCAM overhead. © Springer Nature Singapore Pte Ltd 2020.

关键词： Consistency Hybrid SdN Network updates

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Preface: Security and safety in physical layer systems

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Security and Safety 2024年第1期3卷 4-6页

作者： Aiqun Hu Liang Jin Xiangyun Zhou Feng Shu Xiangwei Zhou State Key Laboratory of Mobile Communications Southeast UniversityNanjing 210096China National Digital Switching System Engineering&Technological R&D Center Zhengzhou 450002China School of Engineering Australian National UniversityCanberra 2601Australia School of Information and Communication Engineering Hainan UniversityHaikou Hainan 570100China Division of Electrical and Computer Engineering Louisiana State UniversityBaton Rouge 70803USA

This special topic mainly focuses on the progress of physical-layer security(PLS)technologies and their potential applications for the future beyond fifth-generation(B5G)and sixth-generation(6G)*** tremendous growth in connectivity and the ubiquity of wireless communications have resulted in an unprecedented awareness of the importance of security and *** secure and trusted communications is vital for future intelligent connected applications,especially life-critical vehicle-toeverything(V2X)***,the heterogeneous,dynamic and decentralized architecture of these networks leads to difficulties for cryptographic key management,and *** exploiting the physical characteristics of devices,wireless channels and noise,PLS offers reliable solutions against eavesdropper attacks as complementary approaches to cryptographic techniques.

关键词： layer complementary networks

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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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Measuring^(222)rn in aquatic environment via Pulsed Ionization Chamber radon detector

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Acta Oceanologica Sinica 2023年第8期42卷 185-189,I0001-I0006页

作者： Lijun Song Wen Liu Shibin Zhao Chunqian Li Jinjia Guo Natasha dimova Bochao Xu Frontiers Science Center for Deep Ocean Multispheres and Earth System/Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education Ocean University of ChinaQingdao 266100China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China College of Chemistry and Chemical Engineering Ocean University of ChinaQingdao 266100China College of Information Science and Engineering Ocean University of ChinaQingdao 266100China R&D Center for Marine Instruments and Apparatuses Qingdao Marine Science and Technology CenterQingdao 266200China Department of Geological Sciences College of Arts and SciencesUniversity of AlabamaTuscaloosa 35487USA

radon(rn)is a naturally occurring radioactive inert gas in nature,and^(222)rn has been routinely used as a powerful tracer in various aquatic environmental research on timescales of hours to days,such as submarine groundwater *** we developed a new approach to measure^(222)rn in discrete water samples with a wide range of^(222)rn concentrations using a Pulsed Ionization Chamber(PIC)radon *** sensitivity of the new PIC system is evaluated at 6.06 counts per minute for 1 Bq/L when a 500 mL water sample volume is used.A robust logarithmic correlation between sample volumes,ranging from 250 mL to 5000 mL,and system sensitivity obtained in this study strongly suggests that this approach is suitable for measuring radon concentration levels in various natural *** to the currently available methods for measuring radon in grab samples,the PIC system is cheaper,easier to operate and does not require extra accessories(e.g.,drying tubes etc.)to maintain stable measurements throughout the counting procedure.

关键词： ^(222)rn radon measurement Pulsed Ionization Chamber radon detector radon in discrete water samples submarine groundwater discharge

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An Incremental dynamic Community detection Algorithm Based on Node Participation

An Incremental Dynamic Community Detection Algorithm Based o...

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IEEE International Conference on Cloud Computing and Big data Analysis (ICCCBdA)

作者： Hui Li Fucai Chen Jianpeng Zhang National Digital Switching System Engineering & Technological R & D Center Information Engineering University Zhengzhou China

Many networks in the real world are dynamically changing over time, and the community structure also changes accordingly. The community detection in the dynamic and constantly evolving network has received great attention from researchers. In order to uncover the community structure in the dynamic network, this paper proposes an incremental dynamic community detection algorithm based on node participation (NPICd). It defines the node participation to the community and the community fitness. In response to the changes of nodes and edges in the network, different update strategies are proposed to discover the community at different moments in an incremental manner. The experimental results on the real network show that compared with several widely used methods, our algorithm can quickly and accurately mine the community structure in the dynamic network.

关键词： Cloud computing Atmospheric measurements Heuristic algorithms Image edge detection Conferences Clustering algorithms Big data

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Near-field Channel Estimation for dynamic Metamaterial Antenna systems

Near-field Channel Estimation for Dynamic Metamaterial Anten...

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International Conference on Computer and Communications (ICCC)

作者： Shifei Wang Shuming Guo Zhiqing Tang Gangtao Han Lingfeng Shen School of Cyber Science and Engineering Zhengzhou University Zhengzhou CN National Digital Switching System Engineering & Technological R&D Center Zhengzhou CN School of Electrical and Information Engineering Zhengzhou University Zhengzhou CN China Information Technology Designing & Consulting Institute Co. Ltd. Beijing CN

The next generation of wireless technology, 6G, will likely incorporate advanced technologies such as extremely large-scale antenna arrays (ELAA) and millimeter wave (mmWave) communication. These cutting-edge features have the potential to revolutionize the way we communicate wirelessly, near-field communication (NFC) can not be ignored in future 6G mobile networks. Compared to far-field communication, the waves that propagate in the near-field region have a spherical wavefront. By utilizing the time agile of dMA and the correlation between near-field guidance vectors, we propose a novel channel estimation algorithm. Compared with the classic two-dimensional (2d) multiple signal classifier (MUSIC) algorithm, this algorithm effectively reduces computational complexity and ensures estimation accuracy. Simulation results show that the proposed channel estimation scheme achieves the expected results.

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A two-step weighted least-squares method for joint estimation of source and sensor locations: A general framework

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Chinese Journal of Aeronautics 2019年第2期32卷 417-443页

作者： ding WANG Jiexin YIN Tao TANG ruirui LIU Zhidong WU National Digital Switching System Engineering and Technology Research Center Zhengzhou Institute of Information Science and Technology

It is well known that the Two-step Weighted Least-Squares(TWLS) is a widely used method for source localization and sensor position refinement. For this reason, we propose a unified framework of the TWLS method for joint estimation of multiple disjoint sources and sensor locations in this paper. Unlike some existing works, the presented method is based on more general measurement model, and therefore it can be applied to many different localization ***, it does not have the initialization and local convergence problem. The closed-form expression for the covariance matrix of the proposed TWLS estimator is also derived by exploiting the first-order perturbation analysis. Moreover, the estimation accuracy of the TWLS method is shown analytically to achieve the Cramér-rao Bound(CrB) before the threshold effect takes place. The theoretical analysis is also performed in a common mathematical framework, rather than aiming at some specific signal metrics. Finally, two numerical experiments are performed to support the theoretical development in this paper.

关键词： Cramér-rao Bound(CrB) disjoint sources General framework Performance analysis Sensor position refinement Source localization Weighted least-squares

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Antenna Selection in Energy Harvesting relaying Networks Using Q-Learning Algorithm

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China Communications 2021年第4期18卷 64-75页

作者： daliang Ouyang rui Zhao Yuanjian Li rongxin Guo Yi Wang College of Information Science and Engineering Huaqiao UniversityXiamen 361021China Centre for Telecommunications Research King’s College LondonLondon WC2R 2LSU.K. School of Electronics and Communication Engineering Zhengzhou University of AeronauticsZhengzhou 450046China China National Digital Switching System Engineering and Technological Research Center Zhengzhou 450002China

In this paper,a novel opportunistic scheduling(OS)scheme with antenna selection(AS)for the energy harvesting(EH)cooperative communication system where the relay can harvest energy from the source transmission is *** this considered scheme,we take into both traditional mathematical analysis and reinforcement learning(rL)scenarios with the power splitting(PS)factor *** the case of traditional mathematical analysis of a fixed-PS factor,we derive an exact closed-form expressions for the ergodic capacity and outage probability in general signal-to-noise ratio(SNr)***,we combine the optimal PS factor with performance metrics to achieve the optimal transmission ***,based on the optimized PS factor,a rL technique called as Q-learning(QL)algorithm is proposed to derive the optimal antenna selection *** highlight the performance advantage of the proposed QL with training the received SNr at the destination,we also examine the scenario of QL scheme with training channel between the relay and the *** results illustrate that,the optimized scheme is always superior to the fixed-PS factor *** addition,a better system parameter setting with QL significantly outperforms the traditional mathematical analysis scheme.

关键词： Q-learning optimal PS factor outage probability ergodic capacity antenna selection

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defending Against Link Failure in Virtual Network Embedding Using a Hybrid Scheme

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China Communications 2019年第1期16卷 129-138页

作者： Jianjian Ai Hongchang Chen Zehua Guo Guozhen Cheng National Digital Switching System Engineering & Technological R&D Center University of Minnesota Twin Cities

Nowadays network virtualization is utterly *** a result,how to protect the virtual networks from attacking on the link is increasingly *** schemes are mainly backup-based,which suffer from data loss and are helpless to such attacks like data *** offer high security level,in this paper,we first propose a multipath and decision-making(Md) scheme which applies multipath simultaneously delivery and decision-making for protecting the virtual *** different security requirement for virtual link,we devise a hybrid scheme to protect the virtual *** the critical links,Md scheme is *** the other links,we adopt the Shared Backup *** simulation results indicate the proposed scheme can significantly increase the security level of the critical link high in the loss of less acceptance ratio.

关键词： network virtualization virtual link security multipath and decision-making hybrid scheme

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