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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1458-1467页

作者： Lu Nan Yikui Liu Lei Wu Tianqi Liu Chuan He College of Electrical Engineering Sichuan University the Department of Electrical and Computer Engineering Stevens Institute of Technology Department of Electrical and Computer Engineering Stevens Institute of Technology

Contingency analysis is an important building block in the stability and reliability analysis of power grid operations. However, due to the large number of transmission lines,in practice only a limited number of contingencies could be evaluated. This paper proposes a graph theory based N-1 contingency selection method to effectively identify the most critical contingencies, which can be used in security-constrained unit commitment(SCUC) problems to derive secure and economic operation decisions of the power grid. Specifically, the power flow transferring path identification algorithm and the vulnerability index are put forward to rank individual contingencies according to potential transmission line overloads. Effectiveness of the proposed N-1 contingency selection method is quantified by applying the corresponding SCUC solution to the full N-1 security evaluation, i. e., quantifying total post-contingency generation-load imbalance in all N-1 contingencies. Numerical results on several benchmark IEEE systems, including5-bus, 24-bus, and 118-bus systems, show effectiveness of the proposed method. Compared with existing contingency selection methods which usually resort to full power flow calculations,the proposed method relies on power gird topology to effectively identify critical contingencies for facilitating the optimal scheduling of SCUC problems.

关键词： Concentric relaxation contingency analysis graph theory security-constrained unit commitment(SCUC) shortest path vulnerability index

graph theory for FPGA minimum configurations

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Journal of Semiconductors 2011年第11期32卷 167-171页

作者：阮爱武李文昌项传银宋江民康实廖永波 State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China

A traditional bottom-up modeling method for minimum configuration numbers is adopted for the study of FPGA minimum configurations. This method is limited ifa large number of LUTs and multiplexers are presented. Since graph theory has been extensively applied to circuit analysis and test, this paper focuses on the modeling FPGA configurations. In our study, an internal logic block and interconnections of an FPGA are considered as a vertex and an edge connecting two vertices in the graph, respectively. A top-down modeling method is proposed in the paper to achieve minimum configuration numbers for CLB and IOB. Based on the proposed modeling approach and exhaustive analysis, the minimum configuration numbers for CLB and IOB are five and three, respectively.

关键词： graph theory minimum configuration number FPGA CLB IOB

Detectable states, cycle fluxes, and motility scaling of molecular motor kinesin： An integrative kinetic graph theory analysis

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Frontiers of physics 2017年第6期12卷 21-32页

作者： Jie Ren Center for Phononics and Thermal Energy Science School of Physics Science and Engineering Tongji University 200092 Shanghai China

The process by which a kinesin motor couples its ATPase activity with concerted mechanical hand- over-hand steps is a foremost topic of molecular motor physics. Two major routes toward elucidating kinesin mechanisms are the motility performance characterization of velocity and run length, and single-molecular state detection experiments. However, these two sets of experimental approaches are largely uncoupled to date. Here, we introduce an integrative motility state analysis based on a theorized kinetic graph theory for kinesin, which, on one hand, is validated by a wealth of accumulated motility data, and, on the other hand, allows for rigorous quantification of state occurrences and chemomechanical cycling probabilities. An interesting linear scaling for kincsin motility performance across species is discussed as well. An integrative kinetic graph theory analysis provides a powerful tool to bridge motility and state characterization experiments, so as to forge a unified effort for the elucidation of the working mechanisms of molecular motors.

关键词： graph theory molecular motor state detection cycle flux motility scaling

Regional differences in gully network connectivity based on graph theory:a case study on the Loess Plateau,China

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Journal of Mountain Science 2023年第4期20卷 1035-1050页

作者： CHENG Jian-hua LUO Lan-hua LI Fa-yuan LIU Lu-lu CUI Ling-zhou School of Geography Nanjing Normal UniversityNanjing210023China Key Laboratory of Virtual Geographic Environment Ministry of EducationNanjing Normal UniversityNanjing210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing Normal UniversityNanjing210023China School of Geography and Ocean Science Nanjing UniversityNanjing210023China College of Life and Environmental Science Wenzhou UniversityWenzhou325035China

Material exchange frequently occurs in gullies,and thus the relationship between a gullynetwork structure and sediment transport potential has attracted considerable ***,previous researches ignored the difficulty of material transport from sources to sinks,and did not quantify the connectivity of a network *** this study,we used a graph model structure to model gully networks of six typical sample areas in the Loess Plateau of China and quantified gully network connectivity using four indexes:average node strength,accessibility from sources to sinks,potential flow,and network structural connectivity *** show that:(1)Reflected by different quantitative indexes,the trends of gully network connectivity in different regions are *** north to south,the connectivity of a sample area first increases and then decreases.(2)The more mature gullies have stronger network *** resistance is conducive to material transport in the gullies.(3)The node connectivity index of the gully network shows a significant aggregation distribution in space,and node connectivity on the main channel is often stronger than that on the branch *** results not only deepen the understanding of the process and mechanism of loess gully geomorphic development and evolution but also provide a reference for geomorphic studies.

关键词： graph theory Gully network Loess Plateau Connectivity Regional difference

Fault-line selection and fault-type recognition in DC systems based on graph theory

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Protection and Control of Modern Power Systems 2018年第1期3卷 276-285页

作者： Yan Xu Jingyan Liu Yuan Fu State Key Laboratory of New Energy and Electric Power Systems North China Electric Power UniversityBaoding 071003HebeiChina

When a fault occurs in a DC system,the fault current rises rapidly with no zero-crossing point which makes fault-line selection and fault-type identification *** this paper,an online detection and protection method based on graph theory,namely the“double D method”,is proposed for fault-line selection and fault-type identification in DC *** the proposed method,the entire distribution network is visualized as a“map”with vertices representing the line convergence points and edges representing the connection lines.A network topology matrix“D”is formed by detecting the current directions as the current directions are altered following a fault,whereas the current directions at the ends of non-fault lines remain the *** order to prevent misjudgment problems arising from power flow reversal,the rates of change of the fault currents are used to further determine whether a fault has occurred and the“double D method”is introduced to identify the fault *** results with different fault types verify the effectiveness and reliability of the proposed method.

关键词： Network topology matrix Double D method Fault-line selection Fault-type identification graph theory

A graph theory model using human nature structure

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High Technology Letters 2017年第4期23卷 350-359页

作者： Liu Jia Hu Haimiao Duan Miyi Li Wenfa Yuan Jiazheng School of Computer Science and Engineering Beihang University Beijing 100191 P. R. China Smart City College Beijing Union University Beijing 100101 P. R. China

A graph theory model of the human nature structure( GMH) for machine vision and image/graphics processing is described in this paper. Independent from the motion and deformation of contours,the human nature structure( HNS) embodies the most basic movement characteristics of the body. The human body can be divided into basic units like head,torso,and limbs. Using these basic units,a graph theory model for the HNS can be constructed. GMH provides a basic model for human posture processing,and the outline in the perspective projection plane is the body contour of an image. In addition,the GMH can be applied to articulated motion and deformable objects,e. g.,in the design and analysis of body posture,by modifying mapping parameters of the GMH.

关键词： articulated motion and deformable objects(AMDO) human nature structure(HNS) graph theory machine vision image/graphics processing

A graph theory Based Self-Learning Honeypot to Detect Persistent Threats

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Intelligent Automation & Soft Computing 2023年第3期35卷 3331-3348页

作者： R.T.Pavendan K.Sankar K.A.Varun Kumar Department of Mathematics College of EngineeringAnna UniversityChennai600025India Department of Networking and Communications School of ComputingSRM Institute of Science and TechnologyKattankulathur602203India

Attacks on the cyber space is getting exponential in recent *** penetrations and breaches are real threats to the individuals and *** security systems are good enough to detect the known threats but when it comes to Advanced Persistent Threats(APTs)they *** APTs are targeted,more sophisticated and very persistent and incorporates lot of evasive techniques to bypass the existing ***,there is a need for an effective defense system that can achieve a complete reliance of *** address the above-mentioned issues,this paper proposes a novel honeypot system that tracks the anonymous behavior of the APT *** key idea of honeypot leverages the concepts of graph theory to detect such targeted *** proposed honey-pot is self-realizing,strategic assisted which withholds the APTs actionable tech-niques and observes the behavior for analysis and *** proposed graph theory based self learning honeypot using the resultsγ(C(n,1)),γc(C(n,1)),γsc(C(n,1))outperforms traditional techniques by detecting APTs behavioral with detection rate of 96%.

关键词： graph theory Domination Connected Domination Secure Connected Domination honeypot self learning ransomware

Multi-Body Dynamics Modeling and Simulation Analysis of a Vehicle Suspension Based on graph theory

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Journal of Beijing Institute of Technology 2018年第4期27卷 518-526页

作者： Jun Zhang Xin Li Renjie Li School of Mechanical Engineering Beijing Institute of Technology

Multi-body dynamics,relative coordinates and graph theory are combined to analyze the structure of a vehicle *** dynamic equations of the left front suspension system are derived for ***,The pure tire theory model is used as the input criteria of the suspension multibody system dynamic model in order to simulate the suspension K&C characteristics ***,it is important to verify the accuracy of this model by comparing and analyzing the experimental data and simulation *** results show that the model has high precision and can predict the performance of the *** also provides a new solution for the vehicle dynamic modeling.

关键词： multi-body dynamics Matlab suspension graph theory

An interactive approach for generating spatial architecture layout based on graph theory

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Frontiers of Architectural Research 2023年第4期12卷 630-650页

作者： Xiaoye Xie Wowo Ding School of Architecture and Urban Planning Nanjing UniversityNanjing 210093China Architects&Engineers Co. Ltd of Southeast UniversityNanjing 210096China

This study proposes a graph theory based method for generating three-dimensional architectural layouts on the target of creating space that provides rich perceptual *** proposed approach incorporates the decisions of architects in the generation process to improve efficiency and avoid invalid *** is interpreted as a combination of volumes adjacent to,intersecting with or containing each other and is represented by a graph with nodes and *** study first generates an orthogonal orientation digraph(OODG),which denotes the relative positions of spaces and provides options for users to decide whether to continue generating the *** on a given OODG,a combination of connected volumes is *** generation results show that the proposed method can generate space providing a rich experience when relations between volumes are properly set.

关键词： Computer-aided architectural design Spatial layout Generation graph theory

Multiple Operating Mode Analysis of Power Converter based on graph theory

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Chinese Journal of Electrical Engineering 2015年第1期1卷 70-77页

作者： Bo Zhang Dongyuan Qiu Genyun Yi School of Electric Power South China University of TechnologyGuangzhou510641China

Power converters are the typical switched systems which operate based on the alternate switching of the semiconductor *** operating mode of power converters consists of several operating stages in one switching *** operating stage refers to a sub-circuit or equivalent circuit where different sub-circuits are switched in a fixed order according to the control strategy *** converter may operate in different operating modes even with the same control scheme,for example,the DC-DC converter has differing performance under the continuous conduction mode(CCM)and discontinuous conduction mode(DCM).Thus,it is necessary to have a comprehensive understanding of the converter’s characteristics in advance to avoid undesired operation in *** this paper,the power converter is considered as a graph made up of several *** sub-circuits in power converter can then be obtained by the mesh combination algorithm,and the operating mode can be constructed by considering the preset switching ON/OFF ***,the typical waveforms in different modes can be predicted,which is useful to identify abnormal phenomena.Cúk converter is taken as an example to demonstrate the proposed multiple mode analysis *** is found that there are four kinds of phenomena in addition to the well-known CCM and ***,the experimental results are provided and show good agreement with the theoretical analysis.

关键词： graph theory multiple modes power converter sub-circuit cúk