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Sparse Reconstructive Evidential Clustering for Multi-View Data

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IEEE/CAA Journal of Automatica Sinica 2024年第2期11卷 459-473页

作者： Chaoyu Gong Yang you School of Computing National University of SingaporeSingapore

Although many multi-view clustering(MVC) algorithms with acceptable performances have been presented, to the best of our knowledge, nearly all of them need to be fed with the correct number of clusters. In addition, these existing algorithms create only the hard and fuzzy partitions for multi-view objects,which are often located in highly-overlapping areas of multi-view feature space. The adoption of hard and fuzzy partition ignores the ambiguity and uncertainty in the assignment of objects, likely leading to performance degradation. To address these issues, we propose a novel sparse reconstructive multi-view evidential clustering algorithm(SRMVEC). Based on a sparse reconstructive procedure, SRMVEC learns a shared affinity matrix across views, and maps multi-view objects to a 2-dimensional humanreadable chart by calculating 2 newly defined mathematical metrics for each object. From this chart, users can detect the number of clusters and select several objects existing in the dataset as cluster centers. Then, SRMVEC derives a credal partition under the framework of evidence theory, improving the fault tolerance of clustering. Ablation studies show the benefits of adopting the sparse reconstructive procedure and evidence theory. Besides,SRMVEC delivers effectiveness on benchmark datasets by outperforming some state-of-the-art methods.

关键词： Evidence theory multi-view clustering(MVC) optimization sparse reconstruction

HYDRODYNAMIC ANALYSIS ON WAVE POWER DEVICES IN NEAR-SHORE ZONES

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Journal of Hydrodynamics 1993年第3期5卷 42-54页

作者： you, Yage Guangzhou Inst of Energy Conversion Chinese Acad of Science Guangzhou China

A boundary element method for three-dimensional hydrodynamic analysis of on-shore wave power devices was presented. The topographic effect near the device was studied. Numerical results show that the effect is signifi... 详细信息

关键词： Boundary element method Hydrodynamics Power generation Water waves

Dynamic Oxime-Urethane Bonds, a Versatile Unit of High Performance Self-healing Polymers for Diverse Applications

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Chinese Journal of Polymer Science 2021年第10期39卷 1281-1291,I0006页

作者： Luzhi Zhang Zhengwei you State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low-dimension Materials(Donghua University)College of Materials Science and EngineeringShanghai Engineering Research Center of Nano-Biomaterials and Regenerative MedicineDonghua UniversityShanghai 201620China

Oxime-urethane bond featuring with high reversibility even at room temperature and multiple reactivity is an emerging dynamic covalent bond,and has shown great potential for self-healing polymers,which are one of the most attractive development directions for next generation of polymeric *** this review,recent progresses on the oxime-urethane-based self-healing polymers,including their designs and applications in diverse fields such as biomedicine,flexible electronics,soft robots,3D printing,protective materials,and adhesives,are summarized,and outlooks on the future development of this field are discussed.

关键词： Self-healing Dynamic covalent bonds Polyurethane Covalent adaptable networks Metal coordination

Effects of urban square entry layouts on spatial ventilation under different surrounding building conditions

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Building Simulation 2021年第2期14卷 377-390页

作者： Wei you Wowo Ding School of Architecture and Urban Planning Nanjing UniversityNanjing210093China

Effective urban square ventilation is important for the living comfort and health of *** research aims to establish some principles of street entry layouts for urban square ventilation *** computational fluid dynamics(CFD)simulation techniques,two types of street entry squares(two-intersection and four-intersection)were investigated under the effect of surrounding *** indices—the spatial mean velocity(),air change rate(ACH)and mean flow rates()through the street entry and square roof—were calculated to quantify the square ventilation *** simulation results indicate that the surrounding buildings could influence the square space *** the surrounding building conditions change to a building coverage ratio of 0.25,theentering through the street entry can be reduced by 35%,and thewithin the square decreases by more than 45%.The optimal street entry layout design depends greatly on the wind *** the wind direction is perpendicular to the square street entry,the corner oblique-entry layout square shows a better ventilation performance than the other *** the wind direction is oblique to the square street entry,thedeclines greatly(up to 68%),and the lateral-entry layout design shows the best ventilation performance.

关键词： urban square street entry layout surrounding building spatial ventilation numerical simulation

Finite-Time Stochastic Stability of Random Impulsive Positive System

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Journal of Systems Science & Complexity 2021年第3期34卷 912-923页

作者： you Lijie MU Xiaowu School of Mathematics and Statistics Zhengzhou UniversityZhengzhou 450001China

The paper focuses on the finite-time stochastic stability(FTSS)problems for positive system with random *** Lyapunov functions with the probability property of the impulsive interval,first,the sufficient conditions of FTSS for the positive systems affected by one type of random impulses are given;second,the criteria of FTSS for positive systems suffered from multiple types of random impulses are ***,two examples are presented to show the validity of results.

关键词： Finite-time stochastic stability positive system random impulses

Voltage Unbalance Compensation in Distribution Feeders Using Soft Open Points

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Journal of Modern Power Systems and Clean Energy 2022年第4期10卷 1000-1008页

作者： Rui you Xiaonan Lu College of Electrical Engineering Qingdao UniversityQingdao 266071China College of Engineering Temple UniversityPA 19122USA

Soft open points(SOPs)are power electronic devices that may replace conventional normally-open points in distribution *** can be used for active power flow control,reactive power compensation,fault isolation,and service restoration through network reconfiguration with enhanced operation flexibility and grid *** to unbalanced loading conditions,the voltage unbalance issue,as a common problem in distribution networks,has negative impacts on distribution network *** this paper,a control strategy of voltage unbalance compensation for feeders using SOPs is *** the power flow control,three-phase current is regulated simultaneously to mitigate the unbalanced voltage between neighboring feeders where SOPs are *** voltage unbalance and current unbalance among three phases are compensated with the injection of negative-sequence and zero-sequence current from *** in response to power outages,three-phase voltage of isolated loads is regulated to be balanced by the control of SOPs connected to the feeders under faults,even if the loads are unbalanced.A MATLAB/Simulink model of the IEEE 13-bus test feeder with an SOP across feeder ends is implemented,and experimental tests on a hardware-in-the-loop platform are implemented to validate the effectiveness of the proposed control strategy.

关键词： Distribution network service restoration soft open point(SOP) voltage unbalance compensation

A robust TDOA based solution for source location using mixed Huber loss

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Journal of Systems Engineering and Electronics 2021年第6期32卷 1375-1380页

作者： you Mingyi LU Annan Science and Technology on Communication Information Security Control Laboratory No.36 Research Institute of China Elec-tronics Technology Group CorporationJiaxing 314033China No.36 Research Institute of China Electronics Technology Group Corporation Jiaxing 314033China

This paper proposes a source localization solution robust to measurement outliers in time differences of arrivals(TDOA)*** solution uses a piecewise loss function named as mixed Huber loss(MHL)proposed based on the classical Huber loss(HL)and its refined *** MHL is able to effectively mitigate the impact of all levels of measurement outliers by setting two triggering *** practice,appropriate triggering threshold values can be obtained through simulation given the level of measurement noise and a rough range of potential measurement outliers.A clustering based approach is proposed to further improve the robustness of localization solution against reference sensor related *** are included to examine the solution's performance and compare it with several *** proposed MHL based solution is shown to be superior to the classical solution and the *** solution is shown to be even robust to multiple measurement ***,the influence of range measurement outliers in the reference sensor can be effectively mitigated by the clustering based approach.

关键词： time differences of arrivals(TDOA) robust localization Huber loss(HL) outlier mitigation

Non-Deterministic Liveness-Enforcing Supervisor Tolerant to Sensor-Reading Modification Attacks

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 240-248页

作者： Dan you Shouguang Wang IEEE the School of Information and Electronic Engineering Sussex Artificial Intelligence InstituteZhejiang Gongshang UniversityHangzhou 310018China

In this paper, we study the supervisory control problem of discrete event systems assuming that cyber-attacks might occur. In particular, we focus on the problem of liveness enforcement and consider a sensor-reading modification attack(SM-attack) that may disguise the occurrence of an event as that of another event by intruding sensor communication channels. To solve the problem, we introduce non-deterministic supervisors in the paper, which associate to every observed sequence a set of possible control actions offline and choose a control action from the set randomly online to control the system. Specifically, given a bounded Petri net(PN) as the reference formalism and an SMattack, an algorithm that synthesizes a liveness-enforcing nondeterministic supervisor tolerant to the SM-attack is proposed for the first time.

关键词： Cyber-attacks cyber-physical system(CPS) liveness non-deterministic supervisors Petri net(PN)

Overgroups of classical groups over commutative rings in linear group

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Science China Mathematics 2006年第5期49卷 626-638页

作者： you Hong Department of Mathematics Harbin Institute of Technology Harbin 150001 China

For a commutative ring with identity, we obtain a complete description of all overgroups of unitary groups U2nR (n ≥ 5), which include symplectic, ordinary orthogonal and standard unitary groups, in linear group GL2nR.

关键词： overgroup, unitary group, linear group, commutative ring.