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Automatic segmentation of foveal avascular zone based on adaptive watershed algorithm in retinal optical coherence tomography angiography images

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Journal of Innovative Optical Health Sciences 2022年第1期15卷 77-89页

作者： Jian Liu Shixin Yan Nan Lu Dongni Yang Chunhui Fan Hongyu Lv Shuanglian Wang in Zhu Yuqian Zhao Yi Wang Zhenhe Ma Yao Yu School of Control Engineering Northeastern University at Qinhuangdao QinhuangdaoHebei 066004P.R.China Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology Qinhuangdao Hebei 066004P.R.China Department of Ophthalmology The First Hospital of Qinhuangdao QinhuangdaoHebei 066004P.R.China Department of Ophthalmology Qinhuangdao Maternal and Child Health Hospital QinhuangdaoHebei 066004P.R.China Tangshan Maternal and Children Hospital Tangshan Hebei 063000P.R.China Biomedical Information Engineering Lab The University of Aizu

The size and shape of the foveal avascular zone(FAZ)have a strong positive correlation with several vision-threatening ret inovascular *** identification,segmentation and analysis of FAZ are of great significance to clinical diagnosis and *** presented an adaptive watershed algorithm to automatically extract F AZ from retinal optical coherence tomography angiography(OCTA)*** the traditional watershed algorithm,"over-segmentation"is the most common *** is often incorrectly divided into multiple regions by redundant"dams".This paper analyzed the relationship between the"dams"length and the maximum inscribed circle radius of FAZ,and proposed an adaptive watershed algorithm to solve the problem of"over-segmentation".Here,132 healthy retinal images and 50 diabetic retinopathy(DR)images were used to verify the accuracy and stability of the *** ophthal-mologists were invited to make quan titative and qualitative evaluations on the segmentation results of this *** quantitative evaluation results show that the correlation coffi-cients between the automatic and manual segmentation results are 0.945(in healthy subjects)and 0.927(in DR patients),*** qualitative evaluation,the percentages of"perfect segmentation"(score of 3)and"good segmentation"(score of 2)are 99.4%(in healthy subjects)and 98.7%(in DR patients),*** work promotes the application of watershed algorithm in FAZ segmentation,making it a useful tool for analyzing and diagnosing eye diseases.

关键词： Foveal avascular zone optical coherence tomography angiography watershed algo-rithm diabetic retinopathy.

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control design under attacks of multi-agent switched systems via arbitrary switching

Control design under attacks of multi-agent switched systems...

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2022 Chinese Automation Congress, CAC 2022

作者： Li, Zhanjie Ma, Yajing Nanjing University of Posts and Telecommunications Institute of Advanced Technology for Carbon Neutrality Nanjing China Sichuan Xihua University Provincial Engineering Research Center for New Energy Vehicle Intelligent Control and Simulation Test Technology Chengdu China School of Internet of Things Jiangsu Key Laboratory of Broadband Wireless Communication and Internet of Things Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781665465335

In this paper, the consensus control against attacks for a type of nonlinear multi-agent switched systems under arbitrary switching is studied. The attacks corrupt the information data, which cannot be used for the feedback design. Meanwhile, the switching logic is not allowed to be designed. To tackle the complicated effects, some intermediate variables and adaptive laws are introduced to compensate the uncertainties. By constructing a common Lyapunov function, an adaptive protocol is proposed such that the outputs of the agents achieve consensus against attacks under arbitrary switching. © 2022 IEEE.

关键词： Multi agent systems

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Research on Rapid and High-Sensitivity Ellipsometry Employing Multi-Harmonic Terms of Dual Cascade Photoelastic Modulators

SSRN

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SSRN 2024年

作者： Li, Kewu Wang, Shuang Wang, Liming Deng, Shiwei Wang, Zhibin School of Electrical and Control Engineering North University of China Taiyuan030051 China Engineering and Technology Research Center of Shanxi Province for Opto-electric Information and Instrument North University of China Taiyuan030051 China Institute of Frontier Interdisciplinary Sciences North University of China Taiyuan030051 China School of Information and Communication Engineering North University of China Taiyuan030051 China

In the fields of film coating, microelectronics, biosensing, and nanomaterial characterization, there is a growing demand for rapid and highly sensitive ellipsometry. Photoelastic modulation ellipsometry has emerged as a method capable of achieving unparalleled measurement speeds and sensitivities. However, the performance of this ellipsometry technique is contingent upon the precise calibration and long-term stability control of photoelastic modulation modulator (PEM). In this study, a differential frequency photoelastic modulation ellipsometry was proposed. Two PEMs operating at distinct frequencies were cascaded, and multi-harmonic terms of the modulation signals were extracted using digital phase-locking technology. Real-time/in-situ calibration and control of PEM was accomplished within a single Field-Programmable Gate Array. The developed system facilitated high-speed and high-sensitivity ellipsometric parameter measurements. To validate the proposed methodology, an experimental system was meticulously constructed, and performance tests were conducted on air and SiO2 film samples. Additionally, a tensile force experiment was performed on a Cu/polyimide film. Results demonstrated that the proposed approach achieved highly sensitive ellipsometry measurements within milliseconds, with system repeatability and sensitivity at 10-3°. This research provided valuable insights into high-precision, high-sensitivity, and rapid in-situ ellipsometry measurements, offering promising applications in online real-time film technology detection. © 2024, The Authors. All rights reserved.

关键词： Frequency modulation

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A Unified NOMA Framework in Beam-Hopping Satellite communication Systems

arXiv

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arXiv 2024年

作者： Zhang, Xuyang Yue, Xinwei Li, Tian Han, Zhihao Wang, Yafei Ding, Yong Liu, Rongke The Key Laboratory of Information and Communication Systems Ministry of Information Industry The Key Laboratory of Modern Measurement & Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100101 China The 54th Research Institute of China Electronics Technology Group Corporation Hebei Shijiazhuang050081 China The School of Electronic and Information Engineering Beihang University Beijing100191 China Shenzhen Institution of Beihang University Shenzhen518063 China The Baicells Technologies Co. Ltd Beijing100095 China

This paper investigates the application of a unified non-orthogonal multiple access framework in beam hopping (U-NOMA-BH) based satellite communication systems. More specifically, the proposed U-NOMA-BH framework can be applied to code-domain NOMA based BH (CD-NOMA-BH) and power-domain NOMA based BH (PD-NOMA-BH) systems. To satisfy dynamic-uneven traffic demands, we formulate the optimization problem to minimize the square of discrete difference by jointly optimizing power allocation, carrier assignment and beam scheduling. The non-convexity of the objective function and the constraint condition is solved through Dinkelbach’s transform and variable relaxation. As a further development, the closed-from and asymptotic expressions of outage probability are derived for CD/PD-NOMA-BH systems. Based on approximated results, the diversity orders of a pair of users are obtained in detail. In addition, the system throughput of U-NOMA-BH is discussed in delay-limited transmission mode. Numerical results verify that: i) The gap between traffic requests of CD/PD-NOMA-BH systems appears to be more closely compared with orthogonal multiple access based BH (OMA-BH);ii) The CD-NOMA-BH system is capable of providing the enhanced traffic request and capacity provision;and iii) The outage behaviors of CD/PD-NOMA-BH are better than that of OMA-BH. Copyright © 2024, The Authors. All rights reserved.

关键词： Satellite communication systems

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Quick Routing Response to Link Failure in Low-Earth Orbit Satellite Networks

Quick Routing Response to Link Failure in Low-Earth Orbit Sa...

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International Conference on Computer and communications (ICCC)

作者： Zhiping Lu Ruxin Zhi Weiguo Ma School of Information and Communication Engineering Beijing University of Posts and Telecommunications State Key Laboratory of Wireless Mobile Communications China Academy of Telecommunications Technology (CATT) Beijing China Key Laboratory of Information and Communication Systems Ministry of Information Industry Beijing Information Science and Technology University Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing China

Low earth orbit satellite communication systems are attractive for provisioning global, high-speed and low latency Internet access services. In order to achieve global continuous multiple coverage, the number of satellites is tremendous. But Low earth orbit satellite networks are prone to instability due to unpredictable link failures and frequent topology changes. Therefore, in this paper, a novel routing schemes with quick response to link failures is first proposed. Based on Dijkstra algorithm, a scalable routing algorithm is proposed to minimize the end-to-end transmission delay. It takes advantage of the predictable constellation trajectory, and changes dynamically according to the changes of network topology. It provides the shortest routing path and an alternative path simultaneously. When a link failure is detected by one satellite, notification packets will be sent to its neighbors for adjustment to the alternative routing path. Notification packets also will be sent to the head node for the recalculation of routing table. Finally, extensive simulations have been conducted, and the results show that the proposed scheme is able to produce desired performance.

关键词： Satellites Network topology Heuristic algorithms Dynamics Low earth orbit satellites Packet loss Routing

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Weak Signal Detection based on Beta Divergence

Weak Signal Detection based on Beta Divergence

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IEEE Workshop on Signal Processing Advances in Wireless communications (SPAWC)

作者： Jiahao Liu Haoxuan Liu Wenqiang Pu Rui Zhou Ming-Yi You Qingjiang Shi Science and Technology on Communication Information Security Control Laboratory Jiaxing China Shenzhen Research Institute of Big Data The Chinese University of Hong Kong Shenzhen China School of Software Engineering Tongji University Shanghai China

Among different electromagnetic spectrum monitoring tasks, a fundamental one is detecting the presence of weak communication signal under non-cooperative setting. Various detection methods have been studied in the literature. These detection methods usually construct a proper hypothesis testing metric to distinguish the signal-plus-noise and noise-only signals. Information entropy based metric has recently been studied and shown its superiority over traditional energy based metrics. We find that it can be explained as a realization of the general Kullback-Leibler divergence. Inspired by that, in this paper, we propose to detect the signal using a statistic divergence called β-divergence. Different choices of β will lead to several well known divergences, e.g., Itakura-Saito divergence and Euclidean distance. We study its detection performance for non-cooperative signal sources. Both simulation and real experiments demonstrate that β-divergence can improve detection performance for various modulation types of communication signals.

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A Novel Regenerative Braking Energy Recuperation System For Electric Vehicles Based on Driving Style

SSRN

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SSRN 2023年

作者： Qun, Qiu Chengqun Wan, Xinshan Wang, Na Cao, Sunjia Ji, Xinchen Wu, Kun Hu, Yaoyu Meng, Mingyu School of Automotive and Traffic Engineering Jiangsu University Zhenjiang212013 China Jiangsu Province Intelligent Optoelectronic Devices and Measurement-Control Engineering Research Center Yancheng Teachers University Jiangsu Yancheng224007 China School of Mechanical Engineering Yancheng Institute of Technology Jiangsu Yancheng224051 China Department of Mathematical Sciences Tsinghua University Beijing100084 China Interdisciplinary Graduate School of Science & Engineering Tokyo Institute of Technology Yokohama2268502 Japan

The regenerative braking energy recovery system of pure electric vehicle is to recover and reuse the consumed driving energy under the premise of ensuring the braking safety. In this paper, the regenerative braking energy recovery system of pure electric vehicle was optimized based on driving style, and the driver model is constructed and the parameters that characterize driving style are determined. BLSTM (Bidirectional Long Short Term Memory) neural network model method was introduced for deep self-learning, and IDP (Iterative dynamic programming)-BLSTM based regenerative braking energy recovery management control strategy was established. Through theoretical analysis and numerical model of the system, the results of parameter representation of the energy system were preliminarily evaluated and then 170,000 km road test was carried out. The results of real vehicle test show that compared with PSO (Particle Swarm Optimization) and SVR (Support Vector Regression), IDP-BLSTM method can meet the personalized requirements of various drivers, improve driving experience and safety, and recover braking energy efficiently. © 2023, The Authors. All rights reserved.

关键词： Recovery

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A Novel Risk Informatization Assessment System for In-Service Highway Slope Based on Network

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Wuhan University Journal of Natural Sciences 2020年第3期25卷 267-276页

作者： CHAI Caiping GUAN Limin WANG Yunfei CUI Wenfen WANG Huifeng School of Highway&Railway Engineering Shaanxi College of Communication TechnologyXi'an 710018ShaanxiChina School of Electronic&Control Engineering Chang'an UniversityXi'an 710064ShaanxiChina

Aiming at the information evaluation of traffic infrastructure in-service roadside slope risk assessment,the method of risk assessment for highway slope engineering is proposed by using the combination of quantitative and qualitative methods,and a new risk assessment method is proposed and *** system,in order to prevent the risks in slope engineering,serves the scientific decision-making of the maintenance,operation and management of the in-service road *** on the analysis of the special geological conditions,complex surrounding environment and construction schemes of existing highway slopes in China,this paper establishes an in-service slope evaluation model for in-service roads,and designs the scheme diagram of the in-service road slope evaluation system based on the networked Internet ***,a set of in-service roadside slope risk assessment system software,the system component block diagram and the main design interface are *** system can meet the needs of comprehensive evaluation of multi-factors in service road slopes.

关键词： in-service road slope slope disaster slope dynamic information networked software regional geological conditions

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P2P transaction method for distributed energy prosumers based on reputation value

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Global Energy Interconnection 2023年第3期6卷 308-323页

作者： Tao Jiang Ting Hua Hao Xiao Linbo Fu Wei Pei Tengfei Ma Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education(Northeast Electric Power University)Jilin 132012P.R.China Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190P.R.China School of Electronic Electrical and Communication Engineering(EECE)University of Chinese Academy of SciencesBeijing 100049P.R.China

Adding a reputation incentive system to peer-to-peer(P2P)energy transactions can encourage prosumers to regulate their trading behavior,which is important for ensuring the efficiency and reliability of P2P *** study proposed a P2P transaction mechanism and game optimization model for prosumers involved in distributed energy sources considering reputation-value ***,the deviation of P2P transactions and the non-consumption rate of distributed renewable energy in P2P transactions were established as indicators to quantify the influencing factors of the reputation value,and a reputation incentive model of P2P transactions for prosumers was ***,the penalty coefficient was applied to the cost function of the prosumers,and a non-cooperative game model of P2P transactions based on the complete information of multi-prosumers was ***,the Nash equilibrium problem was transformed into a nonlinear optimization problem by constructing the modified optimal reaction function,and the Nash equilibrium solution of the game was obtained via a relaxation ***,the modified IEEE 33-node test system based on electricity market P2P and an IEEE 123-node test system were used to analyze and verify the cost and P2P participation of prosumers considering the reputation *** results show that the addition of the reputation incentive system can encourage prosumers to standardize their interactive transaction behavior and actively participate in P2P *** can also improve the operation efficiency of the power grid and promote the perfection of the P2P transaction mechanism.

关键词： P2P Prosumer Non-cooperative game Reputation value Multi-agent of interest Operation optimization

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Dynamic grouping of heterogeneous agents for exploration and strike missions

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Frontiers of Information technology & Electronic engineering 2022年第1期23卷 86-100页

作者： Chen CHEN Xiaochen WU Jie CHEN Panos M.PARDALOS Shuxin DING School of Automation Beijing Institute of TechnologyBeijing100081China Department of Control Science and Engineering Tongji UniversityShanghai200092China Center for Applied Optimization Department of Industrial and Systems EngineeringUniversity of FloridaGainesvilleFL32611USA Signal and Communication Research Institute China Academy of Railway Sciences Corporation LimitedBeijing100081China

The ever-changing environment and complex combat missions create new demands for the formation of mission groups of unmanned combat *** study aims to address the problem of dynamic construction of mission groups under new *** are heterogeneous,and a group formation method must dynamically form new groups in circumstances where missions are constantly being *** our method,a group formation strategy that combines heuristic rules and response threshold models is proposed to dynamically adjust the members of the mission group and adapt to the needs of new *** degree of matching between the mission requirements and the group’s capabilities,and the communication cost of group formation are used as indicators to evaluate the quality of the *** response threshold method and the ant colony algorithm are selected as the comparison algorithms in the *** results show that the grouping scheme obtained by the proposed method is superior to those of the comparison methods.

关键词： Multi-agent Dynamic missions Group formation Heuristic rule Networking overhead

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