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Articles 2191 - 2220 of 4159
Full-Text Articles in Systems Science
3d Model Retrieval Based On Hand-Drawn Sketches, Dianhui Mao, Huanpu Yin, Haisheng Li, Cai Qiang
3d Model Retrieval Based On Hand-Drawn Sketches, Dianhui Mao, Huanpu Yin, Haisheng Li, Cai Qiang
Journal of System Simulation
Abstract: Currently, retrieve 3d models use hand-drawn sketch as query has become an active research field. In the Bag of Feature (BoF) framework, the granularity of the distinction and expression brought by the "hard clustering" is insufficient. To solve this problem, a new method was proposed: GALIF feature was extracted from each sketch and the set of view images of models. BOF was replaced by a feature coding based on “soft clustering”--Gaussian mixture model. A fast and effective manifold ranking algorithm was used to calculate the manifold similarity between images, giving the final retrieve results. The previous methods …
Modeling And Simulation Of Nonlinear Ultrasonic Evaluation For Steel Damage By Finite Element Analysis, Yanyan Liu, Shiwei Ma
Modeling And Simulation Of Nonlinear Ultrasonic Evaluation For Steel Damage By Finite Element Analysis, Yanyan Liu, Shiwei Ma
Journal of System Simulation
Abstract: A method was developed to theoretically determine the creep damage of steel by using the nonlinear ultrasonic technique. A two-dimensional finite element model was built to simulate the creep damage of the material and the ultrasonic wave propagation through the degraded material. The nonlinear phenomenon of wave distortion was due to the microstructural changes of the material, which caused distortion that accumulated with propagation distance. Based on the model, the nonlinear parameter of the second-harmonic wave increased with the increase of temperature, which gave some guidelines for the evaluation of the early stage of the degradation of mechanical properties …
Research On Discrete-Event Modeling And Simulation Language System, Chi Peng, Xiutao Yang, Baocun Hou
Research On Discrete-Event Modeling And Simulation Language System, Chi Peng, Xiutao Yang, Baocun Hou
Journal of System Simulation
Abstract: A discrete-event modeling and simulation language system was proposed. Program model, language specification, simulating support, compiler and simulating application of the language system were introduced. Primary users can directly and quickly build the simulation system. They can describe details of the models and connections between models by writing element and compound models. For good scalability and flexibility, advanced users can create and modify the element component by using C++ language. The language system screens the time management and information distributing for users, which require high simulating ability. Components can be loaded by the simulating engine, which can run on …
Affinity Propagation Based Improved Group Search Optimizer Clustering Algorithm, Zhang Kang, Xingsheng Gu
Affinity Propagation Based Improved Group Search Optimizer Clustering Algorithm, Zhang Kang, Xingsheng Gu
Journal of System Simulation
Abstract: The essence of clustering is an optimization problem. It can be solved by swarm intelligent algorithms which are the popular research area in recent years. A novel Group Search Optimizer (GSO) algorithm named Fast Global Group Search Optimizer (FGGSO) was proposed. FGGSO improved the individuals' updating strategies of GSO, adopting the campaign strategy, destruction-construction strategy and accelerating-jumping strategy. By this means, the proposed algorithm improved the global and local search capability of the original GSO. Furthermore, based on this FGGSO algorithm, a novel improved AP algorithm was proposed. On account of deficiency of AP clustering unable to deal with …
Modeling Analysis And Visualization Simulation For Leveled Stage Of Loitering Munition, Zengyan Li, Xiaomin Li
Modeling Analysis And Visualization Simulation For Leveled Stage Of Loitering Munition, Zengyan Li, Xiaomin Li
Journal of System Simulation
Abstract: Loitering munition can be launched by various platforms. However, due to the impact of the delivery platform, the initial launching status of the missile-borne aircraft is uncertain. The leveled stage of missile-borne aircraft is different from other traditional flight modes. For this particular process, the dynamic model in leveled stage was established. Reliable aerodynamic parameters were obtained by Fluent's simulation method. Based on Simulink, the flight simulation module and control strategy in leveled stage were designed. Simulink-FlightGear method was used to display the real-time flight state. Through the simulation, flight characteristics in leveled stage are achieved, such as, motion …
Sparse Representation Based Private Face Recognition In The Cloud, Liu Yan, Jin Xin, Zhao Geng, Xiaodong Li, Yingya Chen, Guo Kui
Sparse Representation Based Private Face Recognition In The Cloud, Liu Yan, Jin Xin, Zhao Geng, Xiaodong Li, Yingya Chen, Guo Kui
Journal of System Simulation
Abstract: In order to protect user privacy, identification computing of user facial image data in the cloud was accomplished, the sparse representation based private face recognition method in the cloud was proposed. Terminal users collected face images and compared with face images in cloud database and then determined whether faces the terminal acquired belonged to the cloud face database, but both could not achieve each other's face image content. The method processed face images in database and cloud into sparse representation via a third-party terminal, then using Paillier and oblivious transfer homomorphic encryption algorithm to contrast sparse representation coefficient vector …
Pose Estimation Using Limbs Adjustment, Cai Peng, Dehui Kong, Baocai Yin, Huo Yi
Pose Estimation Using Limbs Adjustment, Cai Peng, Dehui Kong, Baocai Yin, Huo Yi
Journal of System Simulation
Abstract: Human body is decomposed into several local component templates connected with tree structure by articulated pose estimation with mixture-of-parts, and the corresponding full score is used to estimate body pose. Such a method fails in precisely estimating human pose due to the defects of tree models when human has the complicated pose of body. To address this problem, pose estimation using limbs adjustment with mixtures-of-parts models was proposed. And pixel discrete direction, local characteristic functions blending full score and pixel discrete direction and other attributes, and pose estimation using limbs adjustment based on local characteristic functions of articulated position …
Improved Method Of Extracting Hks Descriptors And Non-Rigid Classification Applications, Jingyu Jiang, Lili Wan
Improved Method Of Extracting Hks Descriptors And Non-Rigid Classification Applications, Jingyu Jiang, Lili Wan
Journal of System Simulation
Abstract: In order to make the HKS（heat kernel signature）have wider applicability in non-rigid shape analysis, an improved method of extracting HKS descriptors for unconnected non-rigid 3D models was proposed. The largest connected component was obtained. The HKS descriptors of the largest connected component were calculated and those descriptors of the boundary vertices and their 1-ring neighbors were excluded. For shape classifications, the dictionary was learned for each class based on the sparse representation theory. For a test model, each dictionary was utilized to sparsely represent its descriptor set, and the most appropriate dictionary was determined by the representation error, …
Design And Realization Of Optimization System For Rice Type, Weilong Ding, Lifeng Xu, Wei Yang, Gao Nan
Design And Realization Of Optimization System For Rice Type, Weilong Ding, Lifeng Xu, Wei Yang, Gao Nan
Journal of System Simulation
Abstract: It is widely accepted that in traditional crop ideotype breeding, field trials are time-consuming, yet lacking appropriate ways to evaluate the target morphology to be optimal. In order to obtain ideal crop plant type quickly and automatically, meanwhile to reduce the side effects caused by manual operations in the processes of plant type design, e.g. the growing of labor costs and uncertainty of the outcome, a method based on genetic algorithms (GAs) and functional-structural plant model (FSPM) was proposed in this study to optimize plant type of virtual rice by dynamically adjusting phenotypical traits of rice plants. Based on …
3d Reconstruction Of Weak Texture Image Based On Tensor Voting And Dense Map Method, Mingwei Chen, Yang Yang
3d Reconstruction Of Weak Texture Image Based On Tensor Voting And Dense Map Method, Mingwei Chen, Yang Yang
Journal of System Simulation
Abstract: Image based 3D reconstruction method can't effectively detect and match feature points and can't robustly expand 3D point cloud in weak texture image region, due to the fact that weak texture has single color and local reflection phenomenon. It is possible to produce model hole and a large number of 3D noise points, and affect the accuracy and integrity of 3D reconstruction. Slack variables constraint was used to filter mismatch features optimizing the camera matrix, in the dense point cloud expansion stage by using tensor voting principle to filter noise 3d point which is inconsistent with three-dimensional point's normal …
Research Of Virtual Reality Technology In The Treatment Of Anxiety Disorders And Autism, Cuijuan Liu, Liu Zhen, Tingting Liu, Lu Tao, Fang Hao, Liangping Liu
Research Of Virtual Reality Technology In The Treatment Of Anxiety Disorders And Autism, Cuijuan Liu, Liu Zhen, Tingting Liu, Lu Tao, Fang Hao, Liangping Liu
Journal of System Simulation
Abstract: The research of virtual reality technology in the adjuvant treatment of mental diseases has caused wide concern. Anxiety disorders and autism are two major mental diseases in today's society, which has been plagued by both adults and children. Conducting anxiety and autism's rehabilitation has important practical significance. The research of virtual reality technology application in anxiety disorders and autism was reviewed, emotion regulation in the adjuvant treatment of mental diseases was discussed, emotion agents and emotion models were summarized, a technical roadmap of emotion adjuvant treatment for mental diseases was proposed, the architecture of emotion agent was constructed, and …
Study On Unmanned Surface Vehicle Control Simulation System, Zhipeng Shen, Jizhong Liu, Wang Yu, Changsheng Dai
Study On Unmanned Surface Vehicle Control Simulation System, Zhipeng Shen, Jizhong Liu, Wang Yu, Changsheng Dai
Journal of System Simulation
Abstract: Based on hybrid simulation, applying USV(Unmanned Surface Vehicles) mathematical model, autopilot, PC, gyrocompass, level turntable and embedded development platform, a manipulation simulation system of unmanned was designed. This system consists of shore-based system and shipboard system, and the hardware and software design for the system were researched. The test results show that the manipulation simulation system of USV can reflect the true condition of the USV accurately, and the system can provide a simulation platform for future research.
Molecular Dynamics Of Fluid Properties By Spanwise Oscillations Of Solid Wall, Haijun Dong, Xiaoqing Lu, Haopeng Zhang, Mingming Shan
Molecular Dynamics Of Fluid Properties By Spanwise Oscillations Of Solid Wall, Haijun Dong, Xiaoqing Lu, Haopeng Zhang, Mingming Shan
Journal of System Simulation
Abstract: The fluid properties under the condition of the solid wall spanwise oscillation were studied using the molecular dynamics method. The three dimensional Couette flow model which was made up of copper wall and argon fluid was built. The fluid state of the near wall was simulated under the different oscillation parameters of solid wall and the corresponding fluid velocity field, the density distribution, the potential energy curves and the friction force were obtained. Then the influence mechanism of the wall oscillations on the frictional drag at liquid-solid interface was investigated. The results indicate that the frictional drag between wall …
Research On Matching Measure And Simulation Of Matching Between Sports Industry Technology Innovation Persons And Organizations Under Fuzzy Information, Gao Yan, Jinhai Sun
Research On Matching Measure And Simulation Of Matching Between Sports Industry Technology Innovation Persons And Organizations Under Fuzzy Information, Gao Yan, Jinhai Sun
Journal of System Simulation
Abstract: For the matching between sports industry technology innovation persons and organizations under fuzzy information, a new matching modal was proposed. The factors of sports industry technology innovation persons-organization fit were researched. The qualitative key influence factors were quantified using indirect measure based on interval number complementary judgment matrix of the experts. The matching fit modal of sports industry technology innovation persons and organizations was constructed from the perspective of organizational. It is to verify the feasibility and availability of the matching fit model by using a simulation example.
Texture Classification Based On Multi-Scale Wavelet, Liao Ning, Lisha Xu, Xiaoshan Qian
Texture Classification Based On Multi-Scale Wavelet, Liao Ning, Lisha Xu, Xiaoshan Qian
Journal of System Simulation
Abstract: Texture analysis is quite sensitive to rotations. An efficient approach, called Invariant Contourlet-Fourier Descriptor, was proposed to achieve rotation invariance in texture analysis by extracting a set of Shannon entropy in contourlet domain. Discrete Fourier Transform analysis was applied to entropy vectors of each scale to form rotation invariant feature vectors, the dimensionality of which was reduced further due to the symmetry of DFT magnitude spectrum. Two classifiers, including the well-known Euclidean distance and Support Vector Machine, were studied to measure the distance between the known and unknown features. Experimental results on 1500 texture images show that …
Research Of Diffusion-Based Molecular Oscillation And Synchronization In Nanonetworks, Feiyan Li, Lin Lin, Shiwei Ma
Research Of Diffusion-Based Molecular Oscillation And Synchronization In Nanonetworks, Feiyan Li, Lin Lin, Shiwei Ma
Journal of System Simulation
Abstract: Nanonetworks, the interconnection among nanomachines at nanoscale, is a novel kind of communication and information sharing interdisciplinary technology, and have huge potential prospects in the application of biomedical engineering, environmental monitoring, industrial production and military. Nanomachine is considered to be the basic functional unit, and clock period caused by oscillators is a prerequisite for nanomachines to work. A mathematical model was developed to describe the molecular diffusion characteristics giving the oscillation period expression by theoretical deviation. Research on oscillation and synchronization in nanonetworks is very limited so far, so the study is of great significance to the development and …
Mathematical Model Of Maneuvering Motion And Virtual Simulation For Ultra Large Twin-Propeller Twin-Rudder Ship, Guo Chen, Yan Lifei, Haiqing Shen
Mathematical Model Of Maneuvering Motion And Virtual Simulation For Ultra Large Twin-Propeller Twin-Rudder Ship, Guo Chen, Yan Lifei, Haiqing Shen
Journal of System Simulation
Abstract: A three-degree freedom mathematical model of maneuvering motion for an ultra-large type container ship with twin-propeller twin-rudder is established, with turning circle test and zig-zig test simulation results to verify it. By abstracting the ship maneuvering process, the three-dimensional model of ship, helm, propeller and rudder are modeled according to virtual reality technology, and then the ship posture and the dynamic process of ship maneuvering are displayed by the virtual scene and the responsive three-dimensional model. A virtual simulation system for the maneuvering of ultra large twin-propeller twin-rudder ship is established by the MFC framework and the …
Graphic Method To Simulate Planar Arrays Pattern, Shuchun Zhang, Yongbin Qiu, Jiang Wei, Wei Xin
Graphic Method To Simulate Planar Arrays Pattern, Shuchun Zhang, Yongbin Qiu, Jiang Wei, Wei Xin
Journal of System Simulation
Abstract: Calculating planar arrays pattern is time-consuming in flight simulation whose frame synchronization time is within tens of milliseconds and this would cause removing frames. To resolve this problem, a graphic simulation method was presented to simulate planar arrays' pattern. Based on analyzing ideal patterns' graphic characteristics, a kernel function was constructed whose graphics could reflect all those pattern's characteristics. Then this kernel's graphics being used as a section plane were rotated in the spatial coordinates to match the ideal pattern. The simulation results show that this method can be rapidly calculated and the simulated pattern is highly true to …
Synthetic Aperture Radar Signal Simulation Of Ships On Sea Surface, Guijie Diao, Xiaojian Xu, Ni Hong, Junjie Lu
Synthetic Aperture Radar Signal Simulation Of Ships On Sea Surface, Guijie Diao, Xiaojian Xu, Ni Hong, Junjie Lu
Journal of System Simulation
Abstract: A synthetic aperture radar (SAR) signal simulation method for ship targets on sea surface was proposed and the SAR signature model was established. The ship six degrees freedom motion model, the sea surface complex reflection coefficient model and the target electromagnetic scattering model were introduced. Based on the high frequency electromagnetic scattering calculation method and multi-path electromagnetic scattering, the electromagnetic coupling scattering and the time-varying characteristics were simulated. By comparing and analyzing the imaging results of the simulated SAR signal in different states, the physical scattering characteristics of ship targets on sea surface was realistically reflected, at the same …
Topology-Aware Dynamic Load-Balancing Of Conservative Simulation, Yanlong Zhai, Nana Jia, Xinyu Zhang, Yang Kai, Duzheng Qing
Topology-Aware Dynamic Load-Balancing Of Conservative Simulation, Yanlong Zhai, Nana Jia, Xinyu Zhang, Yang Kai, Duzheng Qing
Journal of System Simulation
Abstract: In parallel and distributed discrete-event simulation, the work load of logical processes (LPs) may become imbalanced due to the change of resources or newly generated events. This will increase LPs' waiting time in conservative simulations and the rollback times in the optimistic simulation. A topology-aware dynamic load-balancing approach of conservative simulation was proposed to solve this problem. The working time was monitored and calculated to detect whether imbalance occurs based on K-means clustering algorithm. The load balancing scheme was calculated according to the load and topology. Experimental results show that the proposed approach can balance the load rapidly and …
Discrete-Event Simulation-Engine Technology Based On Mailbox-Mechanism In C4Isr System, Wendi Cheng, Fengxin Sun, Chu Wei
Discrete-Event Simulation-Engine Technology Based On Mailbox-Mechanism In C4Isr System, Wendi Cheng, Fengxin Sun, Chu Wei
Journal of System Simulation
Abstract: For the design of discrete event simulation engine about combat simulation platform tools in C4ISR System, discrete events were divided into several types according to the C4ISR System's functional components and operational deduction process. The advantage of centralized management and convenient access was made use of by the mechanism of sending and receiving emails in mailbox to support the circulation of discrete events. Besides, the fixed-step driven and event-driven discrete event engine strategies were compared and analyzed. The result shows that, discrete event-driven clock algorithm, which can greatly reduce the consumed machine-time in simulation, is more applicable at …
Semi-Physical Simulation System Research For Marine Fuel Oil Purifier, Zhang Ning, Zhipeng Shen, Jizhong Liu, Haiwei Wang
Semi-Physical Simulation System Research For Marine Fuel Oil Purifier, Zhang Ning, Zhipeng Shen, Jizhong Liu, Haiwei Wang
Journal of System Simulation
Abstract: Practical training in ship fuel oil purifier systems have lots of limitations including poor stability, development difficulties and high maintenance cost. A semi-physical simulation system for marine fuel oil purifier was proposed. According to the real ship control box, a fuel oil purifier control box was designed. A process simulation system was developed to simulate the fuel oil tube and purifier function, which could achieve the working process of purifier system and the phenomenon of fault alarm. The simulation system can reappear the working process of the oil purifier and simulate the fault conditions to improve the …
Mufti-Model Soft Modeling Based On Clustering In Evaporation Process, Peng Chen, Xiaoshan Qian
Mufti-Model Soft Modeling Based On Clustering In Evaporation Process, Peng Chen, Xiaoshan Qian
Journal of System Simulation
Abstract: Based on the idea approach based on multi-model with a stronger robustness and precision, combining with strong coupling and the highly nonlinear characteristics in multi-effect evaporation process, a soft sensor modeling method of fuzzy kernel clustering was proposed based on differential evolution and multi-squares support vector machines. The method made clustering samples under different conditions by use of DE-KFCM, each sub-models were constructed using LSSVM using fuzzy clustering algorithm to cluster the input data under different conditions, and finally get the system output by weighting. Taking alumina evaporation process as an example, for the soft sensor modeling of export …
Research On Prediction Method Of Army Equipment Support Requirement Based On Operation Simulation Case- Reasoning, Yaxin Tan, Fan Rui, Xiao Dong
Research On Prediction Method Of Army Equipment Support Requirement Based On Operation Simulation Case- Reasoning, Yaxin Tan, Fan Rui, Xiao Dong
Journal of System Simulation
Abstract: Aiming at the question of army equipment support requirement prediction, a new mechanism based on simulation case-based reasoning was proposed. The method was given how to describe the simulation case based on characteristic vector, and put forward the constriction of simulation case which contains primary case and accessory case, and two-steps reasoning mechanism using the conception of similarity was researched. Then, some algorithms of similarity between cases were improved and the general flow was expounded. The operation simulation case library was built applying in the requirement prediction of army equipment support. The result of reasoning proves the effectivity and …
Simulation Evaluation Method Of Operational Effectiveness Based On Clustering Analysis And Correlation Analysis, Jiao Song, Chu Wei, Shaojie Mao
Simulation Evaluation Method Of Operational Effectiveness Based On Clustering Analysis And Correlation Analysis, Jiao Song, Chu Wei, Shaojie Mao
Journal of System Simulation
Abstract: Simulation evaluation is one of the important methods for researching operational effectiveness. With the increasing complexity of the evaluation object, the evaluation system becomes more and more huge and the overlap among the indexes is appeared. To deal with the problem, the evaluation method based on clustering analysis and grey correlation analysis was proposed. The evaluation indexes were gained according to the principles that ensure the purpose and comprehensiveness of evaluation. The evaluation indexes covering each other were appeared via clustering analysis, and the representative index was got via correlation analysis. The important degree of index was depicted …
Design And Implementation Of Hardware-In-The-Loop Simulation Dynamic Routing Protocol, Xiaohu Liu, Yuchen Zhang, Qingpo Fang, Leigang Sun
Design And Implementation Of Hardware-In-The-Loop Simulation Dynamic Routing Protocol, Xiaohu Liu, Yuchen Zhang, Qingpo Fang, Leigang Sun
Journal of System Simulation
Abstract: Against the problem of dynamic routing in network Hardware-In-The-Loop Simulation, on the basis of analysis of network HITL simulation principle, a dynamic routing protocol implementation scheme based on OMNeT++ was proposed. A method of routing message transform and a algorithm of time slice synchronize was proposed, overcoming the problem of routing message transform and system real-time. At the same time, using virtual IP technology for multi-host configuration, and OSPF dynamic routing protocol, the Hardware-In-the-Loop Simulation Dynamic Routing Protocol based on OMNeT++ was realized. The dynamic routing protocol with multi scenarios was verified and tested.
Research On The Formalization Description Method Of Manufacturing Capability Service In Cloud Manufacturing, Yingying Xiao, Bohu Li, Xudong Chai, Gong Jing
Research On The Formalization Description Method Of Manufacturing Capability Service In Cloud Manufacturing, Yingying Xiao, Bohu Li, Xudong Chai, Gong Jing
Journal of System Simulation
Abstract: According to the application demand of manufacturing capability service (MCs) in cloud manufacturing system, MCs' formalization description method was focused on. Based on the connotation analysis of MC, the definition and the classification framework of MC were given. Meanwhile, a meta-model of MCs and its attribution details, as well as a EVA (entity-value- attribute)- based persistence method was proposed to realize the formulization of heterogeneous MCs. The primary research and application in the cloud manufacturing system (TianzhiNet) show that the formalization description method of MCs is feasible. Finally, the future works are given.
Order-Independent Image Compositing In Heterogeneous Environments, Liu Ning, Dengming Zhu, Zhaoqi Wang, Shi Min
Order-Independent Image Compositing In Heterogeneous Environments, Liu Ning, Dengming Zhu, Zhaoqi Wang, Shi Min
Journal of System Simulation
Abstract: Conventional image compositing algorithms are designed for homogeneous environments. These algorithms do not take heterogeneity into account and do not make use of the properties of an order-independent compositing operator. As for order-independent image compositing problems in a heterogeneous environment, these algorithms usually can not make full use of the resources. An order-independent image compositing algorithm in heterogeneous environments was proposed, which was able to distribute the workload according to computing and networking characteristics, and managed to optimize compositing scheme by utilizing the properties of order-independent operator. A comprehensive evaluation on the ns-3 network simulator was conducted. Experiment results …
Chinese Shadow Play Simulation Based On Volume Visualization, Shenghua Wang, Tan Jian
Chinese Shadow Play Simulation Based On Volume Visualization, Shenghua Wang, Tan Jian
Journal of System Simulation
Abstract: Protection and preservation of the scene of shadow play is an urgent mission for the Chinese shadow play sustainable development. So far the visual effect is inadequate since shadow plays are always considered as two-dimensional images moving on visualization purpose, which drags down reproduction of the scene. Therefore, intact and lifelike reproduction of 3-D visual information of shadow play is the only task in the study. After an analysis of vision generation process of shadow play, a theoretical model was proposed including screen, puppets and light source, and a corresponding GPU volume rendering method for the play visualization was …
Research On Attitude Controller Based On Modified Adaptive Robust Sliding Mode In Low-Flying, Yunjie Wu, Chuang Song, Jingxing Zuo
Research On Attitude Controller Based On Modified Adaptive Robust Sliding Mode In Low-Flying, Yunjie Wu, Chuang Song, Jingxing Zuo
Journal of System Simulation
Abstract: Regarding inertia uncertainties, external disturbances and severe nonlinear coupling factors among the three channels including pitching, yawing and rolling at low-flying, controller design of wide adaptability could quickly and precisely realize the spacecraft attitude tracking control in a limited time. Based on the nonlinear model of the aircraft attitude, a kind of modified controllers was designed based on a robust adaptive sliding mode controller in the finite time convergence among three channels, the controller is continuous and differentiable. The adaptive controller was improved to stop a large controller output. Simulation results show that the designed attitude controller can …