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2020

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Articles 1111 - 1140 of 1941

Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

Visual Analysis Of Literature Review Of Phase Space Reconstruction, Meng Li, Yeping Bi Jun 2020

Visual Analysis Of Literature Review Of Phase Space Reconstruction, Meng Li, Yeping Bi

Journal of System Simulation

Abstract: The primary object of the paper is to reveal the development process and prospect of phase space reconstruction theory. The technique applied is referred as CiteSpace Ⅲ, a visualized analysis software for citation. The research method of literature metrology was used to classify the fifteen hundred papers from the Web of Science platform related with “phase space reconstruction” into different priorities according to time distribution, spatial distribution, citation and author distribution. All results were displayed in figures and tables. The hot spot and trend of phase space reconstruction were discussed based on the keywords co-occurrence graph and keywords time …

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Memcapacitor Model Based On Memristor, Zhaohui Gan, Yuxin Wu, Jiang Min, Shiying Zhang Jun 2020

Memcapacitor Model Based On Memristor, Zhaohui Gan, Yuxin Wu, Jiang Min, Shiying Zhang

Journal of System Simulation

Abstract: After physical model discovery of memristor in HP lab, the researchers put forward the concept of memcapacitor according to circuit theory. However, the physical object of the memcapacitor has not been found so far. In order to research the memcapacitor, researchers often use other components and circuits to simulate a memcapacitor. After analyzing the existing model of memcapacitor, a new nonlinear transformation method is proposed to transform a memristor into a memcapacitor, by which a nonlinear model of memcapacitor based on the memristor is constructed. The Pspice simulation experiments showed that the model successfully simulated the basic characteristics of …

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Distributed Modeling And Simulation Method Of Equipment Support System Based On Multi Agent, Lili Yin, Kou Li, Wenhui Fan Jun 2020

Distributed Modeling And Simulation Method Of Equipment Support System Based On Multi Agent, Lili Yin, Kou Li, Wenhui Fan

Journal of System Simulation

Abstract: The role of equipment support system becomes more and more important. In view of its large scale and high complexity, it is of great practical significance to study the equipment support system by using distributed modeling and simulation technology. A simulation modeling method of equipment support system based on multi-Agent technology is proposed. The type and function of Agent in the system is designed, and the interaction between them is described. The system architecture based on multi-Agent distributed modeling and simulation is presented. Distributed prototype system of equipment support system based on multi-Agent is designed and implemented by open-source …

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Solid-Liquid Two-Phase Flow Simulation Of Hydrodynamic Suspension Polishing, Shengwei Zhu, Lihui Zhang, Hong Tao, Zhang Cheng Jun 2020

Solid-Liquid Two-Phase Flow Simulation Of Hydrodynamic Suspension Polishing, Shengwei Zhu, Lihui Zhang, Hong Tao, Zhang Cheng

Journal of System Simulation

Abstract: According to the new method of hydrodynamic suspension polishing, CFD software is used to simulate the polishing to obtain the distribution of fluid pressure and the velocity of the particles impacting on the work piece surface under different working conditions by the method of orthogonal design. The simulation results show that the rotational speed ω of the disc is the main factor affecting the dynamic pressure and the abrasive particle velocity, while the machining gap H is the secondary factor,and the least influence factor is the polishing liquid concentration φ. The optimal design parameters are: ω=1500 r/min, …

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Point Cloud Segmentation Method Of Maize Ear, Weiliang Wen, Xinyu Guo, Yang Tao, Deda Zhao, Miao Teng, Hongyu Zhu, Chengyu Dong Jun 2020

Point Cloud Segmentation Method Of Maize Ear, Weiliang Wen, Xinyu Guo, Yang Tao, Deda Zhao, Miao Teng, Hongyu Zhu, Chengyu Dong

Journal of System Simulation

Abstract: Three-dimensional (3D) segmentation of maize ear is the fundamental research of 3D ear phenotype. A method of 3D segmentation for maize ear was proposed in this paper. Firstly, 3D point cloud of maize ear was acquired by using SmartScan 3D scanner. Then the point cloud was simplified by point cloud resampling to improve the efficiency of subsequent algorithm. And a contraction transformation was employed to increase the distance of neighboring grains in Euclidean space by estimating the normal of each point through k-neighbor algorithm. Finally, the point cloud of maize ear was segmented by Euclidean clustering. Results showed that …

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Monitoring Information Visualization For High-Filling Loess Project, Liping Zheng, Chen Wei, Ting Liao, Lu Chang Jun 2020

Monitoring Information Visualization For High-Filling Loess Project, Liping Zheng, Chen Wei, Ting Liao, Lu Chang

Journal of System Simulation

Abstract: The construction of high-filled loess project facessome engineering and technical challenges,such as large and complex earth excavation and earth backfilling operations. According to this situation, this paper presents a dynamic visualization methods for high-filled project based on 3D GIS. By establishing the model of high-filled loess, comparative analysis and visual analysis, dynamic simulation of high-filled loess project, visualization and analysis of Dig-Fill process and monitoring information arerealized. The results show that this visualization method can directly and accurately display the construction process, help decision makers master construction information and process.

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Gait Cpg Adjustment For A Quadruped Robot Based On Hopf Oscillator, Haidong Xu, Gan Su, Ren Jie, Binrui Wang, Yinglian Jin Jun 2020

Gait Cpg Adjustment For A Quadruped Robot Based On Hopf Oscillator, Haidong Xu, Gan Su, Ren Jie, Binrui Wang, Yinglian Jin

Journal of System Simulation

Abstract: CPG (central pattern generator) plays an important role for rhythm motion of the mammals. According to gait characteristics and kinematic relationship of hound, a full symmetric CPG network was built by considering the structure features of quadruped robot. Hopf oscillators model were chosen as core neuron models of CPG network, and the rotation matrix was used to connect four oscillators. After transformation by mapping function, output signals of CPG network were used to control joint angle of the virtual prototype robot. Quick and smooth transition between walk gait and trot gait were achieved by adjusting the parameters of CPG …

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New Model For Mobile Indoor Maps Design And Expression, Deng Chen, Jiangpeng Tian, Xia Qing Jun 2020

New Model For Mobile Indoor Maps Design And Expression, Deng Chen, Jiangpeng Tian, Xia Qing

Journal of System Simulation

Abstract: Indoor maps are the basis and information carrier of indoor location services, and the transmission efficiency of the map information would be affected by the design of indoor maps. In order to improve the effect of indoor map symbol design, enrich and innovate the indoor map expression, a new model of indoor map design and expression is studied on the basis of summarizing and drawing lessons from the current research results. Firstly, the methods for classifying and grading the map elements, and the ideas and application values of the method for three dimensional non-photorealistic symbol design are summarized …

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Variable Structure Pid Speed Control And Rotor Resistance Identification Of Induction Motor, Xiaoyi Lü, Wang Yan, Zhicheng Ji, Dahu Yan Jun 2020

Variable Structure Pid Speed Control And Rotor Resistance Identification Of Induction Motor, Xiaoyi Lü, Wang Yan, Zhicheng Ji, Dahu Yan

Journal of System Simulation

Abstract: With the aim of improving the performance of the vector controlled induction motor system, a novel control method which combines variable structure PID speed control with online identification of rotor resistance based on model reference adaptive system (MRAS) is proposed. The rotor resistance is identified by self-adaptive adjustment in the model reference adaptive system based on the instantaneous reactive power. Given that the parameters can not change on line and the integral saturation phenomenon often exists in traditional PID speed regulator, a variable structure PID speed controller is designed by integrating anti-windup technology with fuzzy theory based on traditional …

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Key Technologies Of Precaution And Prediction Of Abnormal Spatial-Temporal Trajectory: A Review Of Recent Advances, Gongda Qiu, He Ming, Yang Jie, Yuting Cao, Jihong Sun Jun 2020

Key Technologies Of Precaution And Prediction Of Abnormal Spatial-Temporal Trajectory: A Review Of Recent Advances, Gongda Qiu, He Ming, Yang Jie, Yuting Cao, Jihong Sun

Journal of System Simulation

Abstract: The ex-post disposition of a major incident, which is expected to transform into prediction and precaution of abnormal behavior, is increasingly unable to meet the urgent needs of the society.Therapid development and popularization of sensor network and positioning technology lay the foundation for mining spatial-temporal trajectory data. With the key objective of prediction and precaution of abnormal trajectory based on big data mining, the future research directions and prospects on trajectory clustering and recognitionareanalyzed, discussed and elaboratedinthis paper.Temporal trajectory prediction applied in prediction and precaution of abnormal spatial-temporal trajectory is also presented, providing a reference for further research on …

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Line-Rate Defenses Approach Against 10 Gbps Ddos Attacks, Su Cheng, Wentong Wang, Shibao Yang, Xv Linlin, Xinan Tang Jun 2020

Line-Rate Defenses Approach Against 10 Gbps Ddos Attacks, Su Cheng, Wentong Wang, Shibao Yang, Xv Linlin, Xinan Tang

Journal of System Simulation

Abstract: Defenses approach against DDoS(Distributed Denial of Service) attacks is currently an important hot issues. We propose a new efficient defenses approach which adopts a detection system based on metadata analysis to identify the packages of DDoS attacks. The flow control rules are formed based on the summarized experience data. ACL (Access Control List) is applied through inline devices (firewalls and load balancers) or divider to limit rate, clean flow or drop package. 10Gbps bandwidth HTTP requests, which contain malicious DDoS attacks packages, can be detected and cleaned completely in line-rate speed. We especially summarize th traffic characteristics …

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Lightweight Real-Time And Realistic Webgl Rendering Algorithm Based On Pbr, Weixin Zheng, Jinyuan Jia Jun 2020

Lightweight Real-Time And Realistic Webgl Rendering Algorithm Based On Pbr, Weixin Zheng, Jinyuan Jia

Journal of System Simulation

Abstract: Considering the weak rendering ability of web browser, the authenticity and aesthetics of Web3D rendering are always hot topics.In particular, the realization of PBR in the web-side and even dynamic editable are difficult.The realization and dynamic edit of PBR in the web end are especially difficult. Based on the problem mentioned, this paper presents a web-based lightweight real-time rendering algorithm with authenticity and high quality based on the PBR algorithm, which simplifies the complex calculation steps of the algorithm and reduces the computational complexity for rendering. The LPM (Lightweight Progressive Mesh) algorithm is reused to simplify the model file …

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Two Image Watermarkingmethodsbased On Compressive Sensing, Yidi Miao, Lü Ju, Xiumei Li Jun 2020

Two Image Watermarkingmethodsbased On Compressive Sensing, Yidi Miao, Lü Ju, Xiumei Li

Journal of System Simulation

Abstract: As an emerging sample theory, compressive sensing attracts wide attention because it breaks through the Nyquist sampling theorem. , Two different methods of watermark embedding and extraction are presented by measuring the carrier image and watermark image respectively based on compressive sensing. Moreover, the attack tests, such as the Gaussian noise, pepper and salt noise, filtering, compression, and cropping, are implemented to watermarked images. Experiment results show that although the two different methods for image watermarking have different processing procedure, both can guarantee the robustness and security of embedded digital watermark.

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Robotic Navigation Map Construction With Ultra-High Resolution Volumetric Grid, Bingchuan Jiang, Wan Gang, Li Feng, Zhang Wei, Zhenfa Yang Jun 2020

Robotic Navigation Map Construction With Ultra-High Resolution Volumetric Grid, Bingchuan Jiang, Wan Gang, Li Feng, Zhang Wei, Zhenfa Yang

Journal of System Simulation

Abstract: According to the requirements of specific application of robotic localization and navigation, a spatial modeling method of the robotic navigation map with ultra-high resolution volumetric grid model is proposed. The geographic spatial three-dimensional grid model is combined with the robotic navigation map and the consistency of spatial span, grid cell and data organization is analyzed. The characteristics of the robotic navigation map, the source and classification of the data, and the difference and relationship between SLAM are analyzed in detail. The robotic spatial data sets are discretized with the ultra-high resolution volumetric grid units as the data organization units. …

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Multiple Model Predictive Control Of Waste Heat Recovery Systems Based On Organic Rankine Cycle, Han Pu, Ting Zhang Jun 2020

Multiple Model Predictive Control Of Waste Heat Recovery Systems Based On Organic Rankine Cycle, Han Pu, Ting Zhang

Journal of System Simulation

Abstract: A multiple model predictive control strategy based on offline linear model is proposed for controlling the ORC-based WHRSs (waste heat recovery systems). The proposed control strategy is described for a wide operation region of the ORC system. A switching mechanism considering both instant output errors of each model and error accumulation is applied for the switch of local controllers in different operation regimes. Simulation results demonstrate that the proposed method can effectively regulate the evaporating pressure and the superheating temperature for the ORC-based WHRS throughout a wide operation region.

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Fault Diagnosis Model Of Circuit Breaker Based On Sparse Representation And M-Elm, Weihua Niu, Guishu Liang, Zhao Peng Jun 2020

Fault Diagnosis Model Of Circuit Breaker Based On Sparse Representation And M-Elm, Weihua Niu, Guishu Liang, Zhao Peng

Journal of System Simulation

Abstract: In order to improve the deficiencies of the conventional methods used to evaluate the mechanical properties of circuit breaker, a new circuit breaker diagnosis model based on sparse representation and M-ELM (Memetic-Extreme Learning Machine) is constructed. Auxiliary mark motion on the pull rod or shaft is recorded by a high speed camera when the circuit breaker is open or close. The motion trajectory is acquired through sparse representation and mechanical parameters, such as open and close velocity, are calculated according to the travel-time curve of the circuit breaker. With mechanical parameters characteristic values being inputs of M-ELM, fault …

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Bi-Layered Network Model Of Command Information System Based On Task Flow, Cui Qiong, Jianhua Li, Haodan Ran, Mingli Nan Jun 2020

Bi-Layered Network Model Of Command Information System Based On Task Flow, Cui Qiong, Jianhua Li, Haodan Ran, Mingli Nan

Journal of System Simulation

Abstract: As the monolayer and static network model can not reflect the hiberarchy and task property of command information system, a bi-layered network model of command information system based on task flow is established. The dynamic operation mechanism and layered network structure are descripted on the basis of task、structure and function of the system. The bi-layered network consisting of communication network and function network is defined based on the task property and layered network theory. The simulation takes the joint air defense operation command information system as an example and the results demonstrate the effectiveness of the model. The proposed …

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Multi-Objective Image Threshold Segmentation Based On Statistical Curve Difference Method, Yuanfei Zhu, Sixiang Zhang, Zhou Wei, Xiaochen Wang, Zhidong Li Jun 2020

Multi-Objective Image Threshold Segmentation Based On Statistical Curve Difference Method, Yuanfei Zhu, Sixiang Zhang, Zhou Wei, Xiaochen Wang, Zhidong Li

Journal of System Simulation

Abstract: In order to accurately segment the multi-objective image whose objective area is too small, and the background gray value is similar to the objective, a threshold segmentation algorithm based on statistical curve difference method is proposed. The mountain model of multi-objective gray image is established and the gray image is normalized. The number of connected area is counted by threshold division. The statistical curve is plotted with the horizontal coordinate being the gray level with equal interval, and the vertical coordinate being the counting result. The threshold point is the point where the difference value of the statistical …

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Performance Analysis Of Digital Refocusing Process Based On Light Field Imaging, Suping You, Yucheng Lu, Zhang Wei, Yang Bo Jun 2020

Performance Analysis Of Digital Refocusing Process Based On Light Field Imaging, Suping You, Yucheng Lu, Zhang Wei, Yang Bo

Journal of System Simulation

Abstract: Digital refocusing is one of the important properties of light field imaging, and the analysis of its performance has important reference value for the study of light field imaging. In this paper,two different digital refocusing algorithms based on the microlens array light field camera (LFC) in spatial and frequency domain are presented. We study the influences of different domains, interpolation methods and sample radius in digital refocusing algorithm on image quality and computation speed. And we yield a tradeoff between image quality and time consumption in two domains. Experiment results suggest that the two algorithms can achieve digital refocusing …

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Survey On Parallel Collision Detection Algorithms, Fuchang Liu, Shuangjian Wang, Zhigeng Pan, Jinrong Wang Jun 2020

Survey On Parallel Collision Detection Algorithms, Fuchang Liu, Shuangjian Wang, Zhigeng Pan, Jinrong Wang

Journal of System Simulation

Abstract: The demand for real-time collision detection is increasing in different applications. Exploiting the parallel computing capability of multi-core CPUs and GPUs to accelerate the speed of collision detection algorithms has attracted abroad attention. This paper reviews the development history of collision detection algorithms and classified the existing algorithms from multiple perspectives. Moreover, we analyze the strengths and weaknesses of more than ten representative parallel collision detection algorithms based on multi-core CPUs and GPUs from the aspects of the scalability, memory consumption and workload balancing. Finally, the problem of present parallel collision detection research and potential direction of following research …

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Urban Mobile Augmented Reality Method Based On Self Organization Of Multi-Modal Data, Wanxian Guan, Wanpeng Li, Ge Lin, Huagen Wan Jun 2020

Urban Mobile Augmented Reality Method Based On Self Organization Of Multi-Modal Data, Wanxian Guan, Wanpeng Li, Ge Lin, Huagen Wan

Journal of System Simulation

Abstract: In recent years, urban mobile augmented reality has important application prospects. However, with the large-scale scenes in the cities, how to collect and reasonably manage and organize as well as efficiently use the big data sets has become an important issue for the performance of mobile augmented reality. To solve this problem, this paper proposed an urban mobile augmented reality method based on the free organization of multi-modal data, with the application scenario of urban streetscape enhancement. The proposed method takes the multi-modal data as the centric context and aims at how to acquire and process raw data effectively, …

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Denoising Algorithm Based On Neighborhood Expansion Clustering, Xinggang Li, Yaping Zhang, Yuwei Yang Jun 2020

Denoising Algorithm Based On Neighborhood Expansion Clustering, Xinggang Li, Yaping Zhang, Yuwei Yang

Journal of System Simulation

Abstract: Aimed at the three dimensional point clouds model with outliers and noises which is reconstructed based on 2D images, a new denoising algorithm based on neighborhood expansion clustering is proposed. The search for other neighboring points of each data point is conducted by using the Euclidean distance between data points and the transitive property of the neighborhood location relation. All points are processed for cluster partition, which detects and filters the outliers in the point clouds model. The concept of neighborhood expansion clustering and the fast search algorithm based on dynamic grids division are discussed. It solves the …

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Realistic Simulation Of Potted Monocot Plant Based On Ifs, Fanxing Zhang, Feiya Lu, Meili Wang Jun 2020

Realistic Simulation Of Potted Monocot Plant Based On Ifs, Fanxing Zhang, Feiya Lu, Meili Wang

Journal of System Simulation

Abstract: Potted monocot plants are one of the most indispensable plants for landscaping and environment. This paper establishes 3D geometric model of branches, twigs, branches and leaves of potted monocot plants with adjustable morphology parameters based on iterated function system. Specifically, considering the self-similarity and randomness of branch bifurcation structure, a corresponding pruning operation module is established. The visualization of the pruning of the branch morphology with higher degrees of freedom is implemented through the affine transformation matrix and geometric model, producing more realistic computer simulation results. This paper provides guidance for the study and market selection of potted plants.

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Surface Reconstruction Of Point Cloud Based On Geometric Structure, Zhenfa Yang, Wan Gang, Xuefeng Cao, Li Feng, Lixiang Xie Jun 2020

Surface Reconstruction Of Point Cloud Based On Geometric Structure, Zhenfa Yang, Wan Gang, Xuefeng Cao, Li Feng, Lixiang Xie

Journal of System Simulation

Abstract: To solve the problems that the existing noise in dense point cloud generated from sequential images dense matching affects the accuracy, and geometric structure such as flat exists in urban scenes, a surface reconstruction method of dense point cloud based on geometric structure is proposed in this paper. RANSAC algorithm is applied to extract planar structure. The original points were structured into planar points, crease points of two planes intersecting, corner points of three or more planes intersecting and clutter points. Then the structured point cloud is divided into tetrahedron by 3D Delaunay, improving the penalty term …

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Pcnl: A Visual Analysis Method For Comparing Homogeneous Hierarchical Data, Dong Yu, Chen Yi, Yuehong Sun Jun 2020

Pcnl: A Visual Analysis Method For Comparing Homogeneous Hierarchical Data, Dong Yu, Chen Yi, Yuehong Sun

Journal of System Simulation

Abstract: According to the requirements of comparing homogeneous hierarchical data in different fields, a visual analysis method called PCNL is presented in this paper. Homogeneous information is extracted from the multiple levels of the heterogeneous hierarchical data set, and isomorphic node-link trees are constructed. Parallel coordinates are combined with node-link trees, which displays attribute values of leaf nodes in multiple isomorphic trees. Interactive techniques are introduced to help users to compare and analyze multiple attributes of each leaf node in multiplehomogeneous hierarchical structures. Applying this method to compare multi-national MRL data in food safety field can help users to …

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Role And Background Effects Enhancement In Holographic Projection, Desheng Lü, Zhiye Lin, Kong Lu Jun 2020

Role And Background Effects Enhancement In Holographic Projection, Desheng Lü, Zhiye Lin, Kong Lu

Journal of System Simulation

Abstract: Although holographic projection technology combined with three-dimensional animation can be seen on many shows nowadays, the poor ability to identity the black color and the high requirement for camera's placement, which lead to the lack of content and high complexity, have become main restrictions for the development of holographic animation. An algorithm is proposed to replace or adjust the lightness of black color in holographic animation to improve the projection. The linkage of camera in four directions is studied to facilitate the acquisition of holographic projection images, which enhances the holographic animation effect. Finally, a real projection platform …

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Coveragedetecting Algorithm Based On Sub-Pixel Geometricprimitives, Li Hua, Huamin Yang, Han Cheng, Jianping Zhao Jun 2020

Coveragedetecting Algorithm Based On Sub-Pixel Geometricprimitives, Li Hua, Huamin Yang, Han Cheng, Jianping Zhao

Journal of System Simulation

Abstract: A hard shadow anti-aliasing rendering algorithm with sub-pixel accuracywas proposed. The method focused on addressing aliasing artifacts of the shadow map due to the sample density mismatching between light space and camera space. The method extracted geometric primitives from the scene's front view from a light source and storedscene visible triangles with fixed-size and local approximation using conservative rasterization; An algorithm was proposed to detect the covered plurality primitives in one texel based on the texel's vertices, and reconstruct testing depth of shadow ray precisely. The experiment results showed that covered primitives' detection algorithm was able toidentify …

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Simulation On Switch Reluctance Motor Vibration Under Load Condition Based On Ansys, Luan Ru, Jinru Guo Jun 2020

Simulation On Switch Reluctance Motor Vibration Under Load Condition Based On Ansys, Luan Ru, Jinru Guo

Journal of System Simulation

Abstract: At present, the research on the vibration problem of switched reluctance motor is limited to the natural mode analysis under no-load condition. The coupling calculation of transient electromagnetic field and structure dynamic field in SRM is deduced. It is proved that the vibration results of SRM can be obtained under the load. An improved simulation method is proposed to improve the data link of Workbench ANSYS, and to realize the direct coupling of the whole data link between the transient electromagnetic field and the transient structural dynamic field. The simulation method is described in detail for a specific SRM …

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3d Simultaneous Localization And Mapping Based On Rgb-D Images, Lingyan Hu, Cao Lu, Pengwen Xiong, Xin Yong, Zekun Xie Jun 2020

3d Simultaneous Localization And Mapping Based On Rgb-D Images, Lingyan Hu, Cao Lu, Pengwen Xiong, Xin Yong, Zekun Xie

Journal of System Simulation

Abstract: To reduce the accumulated pose error of robots during the three-dimensional simultaneous localization and mapping, a global optimization method is proposed to improve the positioning accuracy and the quality of the map. This method, which is based on the visual odometry of the frame and frame registration model, adds the pose-constraints by closed-loop detection based on image matching. Local loop is combined with random loop to improve the optimization efficiency. The general graph optimization algorithm is used to globally optimize the robot poses. A key-frame selection strategy is also proposed to decrease the consumption of the …

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Flight Support Service Time Estimation Of Hub Airport, Zhiwei Xing, Yunxiao Tang Jun 2020

Flight Support Service Time Estimation Of Hub Airport, Zhiwei Xing, Yunxiao Tang

Journal of System Simulation

Abstract: For the convenience of airport to publish the accurate information about flight status to passengers in time, estimating the service time of airport flight support is needed. Because the flight support service is a mixed procedure of job shop and fixed site, and has characteristics of time window constrains and resource demand difference, a model of flight support service procedure based on vehicle routing problem with time windows (VRPTW) was built. For the strong NP nature of vehicle routing problems, a two phase hybrid heuristic algorithm based on greedy algorithm and tabu search was proposed. It was applied to …

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