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2020

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Articles 271 - 300 of 1941

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

Modeling Of High-Speed Railway Operation Informational Interaction Process Using Oopn, Liping Feng, Qiyuan Peng, Wen Chao Aug 2020

Modeling Of High-Speed Railway Operation Informational Interaction Process Using Oopn, Liping Feng, Qiyuan Peng, Wen Chao

Journal of System Simulation

Abstract: High-speed railway transportation is an informational interaction process involving multi-levels and multiple subsystems. The majority of the present study focuses on the local system, causing some limitations to the overall control of high-speed rail traffic command. The high-speed railway operation process covering traffic control subsystem, train control subsystem, computer interlocking subsystem were researched with the key point of information interaction. Then the future directions were proposed, modeling and application respectively, which could remind of the deepen research on high-speed railway operation. Based on OOPN, the HTOIIP model with the formalized definition was built.

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Application Of Domain Knowledge Representation In Simulation Tutoring For Weapon Utilization, Zhang Chi, Danhua Peng, Kedi Huang Aug 2020

Application Of Domain Knowledge Representation In Simulation Tutoring For Weapon Utilization, Zhang Chi, Danhua Peng, Kedi Huang

Journal of System Simulation

Abstract: According to the requirements and characteristics of the simulation tutoring system for weapon utilization, a knowledge base depending on the domain ontology was designed. The knowledge for weapon utilization, the knowledge representation, and the method of knowledge representation were introduced. Through a combination of the ontology technology and various existing models, the key points of using specific weapon could be mastered by processing the date, information, and experience from expert. The conceptual model of knowledge was built. A knowledge base for weapon utilization was designed and implemented. The structure and function of the simulation tutoring system and rule-based expert …

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Method For Auto-Detection Of Tracking Moving Objects In Complicated Dynamic Environment, Yanling Wang, Guanglun Li, Lin Xiao Aug 2020

Method For Auto-Detection Of Tracking Moving Objects In Complicated Dynamic Environment, Yanling Wang, Guanglun Li, Lin Xiao

Journal of System Simulation

Abstract: An approach was proposed to solve the problem of not accurately identifying the moving targets in the complex dynamic environment. The moving objects were detected by utilizing the method based on the HSV color space and auto-updating the background. The background subtraction method based on the HSV color space was used to solve the problem that the objects could not be accurately identified for the color similarity of objects and background and the influence of the shadow of the moving targets. The background change was divided into the temporary stability and the rapid change, and an automatically updating double …

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Robust Image Cloning With Color Harmonization, Li Bei, Wang Hao, Jiajun Yu, Zhifeng Xie, Youdong Ding Aug 2020

Robust Image Cloning With Color Harmonization, Li Bei, Wang Hao, Jiajun Yu, Zhifeng Xie, Youdong Ding

Journal of System Simulation

Abstract: Image cloning has always been an important part of image editing. In general, it can be divided into three methods, based on a component, based on gradient domain, and based on coordinate respectively, but the color discordant and boundary distortion problems have not been well solved. In order to solve the color discordant problem in the method based on mean value coordinate, a method of image cloning was proposed based on local affinity propagation. The affinity considered the location information of pixels, color information, background information comprehensively, thus it could ease the color discordant and reach color harmonization. The …

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Multi-Objective Cuckoo Search Algorithm, Xingshi He, Li Na, Xinshe Yang, Yu Bing Aug 2020

Multi-Objective Cuckoo Search Algorithm, Xingshi He, Li Na, Xinshe Yang, Yu Bing

Journal of System Simulation

Abstract: It is challenging to solve multi-objective optimization problems with getting high-quality Pareto fronts accurately. The multi-objective Cuckoo Search algorithm (MOCS) was designed by firstly applying the recently developed Cuckoo Search Algorithm (CS) in solving Multi-objective optimization problems, and the fitness function based Pareto definiteness was improved, and the Gradual archive reduction method based on niche technology was proposed to improve the Archive solutions quality. The simulation test results and related performance indicators of nine test problems show that, MOCS algorithm is obviously improved in the aspect of the convergence, the diversity and the uniformity compared with the classic NSGA-II …

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Simulation Analysis Of Rutting Length Based On Driving Safety Under Condition Of Road Waterlogging, Zhang Min, Xinxin Guo, Zhang Chi Aug 2020

Simulation Analysis Of Rutting Length Based On Driving Safety Under Condition Of Road Waterlogging, Zhang Min, Xinxin Guo, Zhang Chi

Journal of System Simulation

Abstract: Rutting is one of the important factors for vehicle hydroplaning in raining days. Based on the analysis of vehicle driveability and lateral stability on the pavement covered by water, the rutting safety evaluation method considering driving safety under the condition of road waterlogging was put forward. Using the CarSim software to simulate vehicle lateral offset and lateral acceleration with different speeds, the rutting evaluation indicators on driving safety were set up. It shows that vehicle lateral offset and lateral acceleration increase quickly and exceed the safety threshold easily when more than 80km/h speed. On the rutting pavement covered by …

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Security Model For Multi-Level Interaction Based On Portable Devices, Xuesi Zhang, Bin Yu Aug 2020

Security Model For Multi-Level Interaction Based On Portable Devices, Xuesi Zhang, Bin Yu

Journal of System Simulation

Abstract: Aiming at the problem of information interaction between multi-security-level devices, a security model based on portable devices was proposed. In use of portable storage device partitions, this model established a security communication channel that transmitted the multi-level interaction problem to the problem of controlling ordered read-write operation sequences. By setting the condition of security level as well as the recognition of partitions and operation, the read-write function for partition was designed to control the read and write operation towards the interactive partition. Based on the above, by designing operation control rules between interaction devices, an effective and bidirectional controlled …

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Research Of Multi-Factor Identity Authentication Scheme For Zigbee Network Nodes, Weiwei Zhou, Yuntian Yue, Bin Yu Aug 2020

Research Of Multi-Factor Identity Authentication Scheme For Zigbee Network Nodes, Weiwei Zhou, Yuntian Yue, Bin Yu

Journal of System Simulation

Abstract: To solve the problem of the man-in-the-middle attack and impersonation attack in ZigBee networks, a scheme based on multi-factor identity authentication for ZigBee network nodes was proposed. The scheme bound the fresh factor updated in a particular cycle with hardware information via a one-way hash function to generate hardware information factor. On this basis, the scheme achieved the authentication mechanism for the nodes through the comparison among key factor, hardware information factor and configuration information factor received by control center. Meanwhile, the nodes completed control center authentication through the signature verification of the message received. Thus, the bidirectional authentication …

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Spatio-Temporal Correlation Described And Analysis Method Of Video Event Based On Case Frame, Ke Jia, Yongzhao Zhan, Xiaojun Chen, Manrong Wang Aug 2020

Spatio-Temporal Correlation Described And Analysis Method Of Video Event Based On Case Frame, Ke Jia, Yongzhao Zhan, Xiaojun Chen, Manrong Wang

Journal of System Simulation

Abstract: In the mass of video resources, how to describe and represent video event content is one of hot issues in the current multimedia information processing. The original theory of case grammar for natural language understanding was extended; Case Frame was designed to describe the relationships between the structures of complex events in the sub-events. In Ref_Asso, which is one of relationships, spatio-temporal correlation was analyzed and reasoned among sub-events. In the experimental part, Case Semantic Frame Net was used to describe and understand the typical complex events in surveillance video. And results of users' retrieval were compared; in which …

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Digital Analysis For Van Gogh's Painting, Yuqing Liu, Yuanyuan Pu, Yangfu Ren, Xu Dan Aug 2020

Digital Analysis For Van Gogh's Painting, Yuqing Liu, Yuanyuan Pu, Yangfu Ren, Xu Dan

Journal of System Simulation

Abstract: Usually, Sparse Coding can be used to extract image characteristics for analyzing the style of visual art works, while researchers always don't do deep data mining on the trained basis function. The basic functions that could reflect the interior characteristics of a stylish image were trained based on Sparse Coding on art works. The spatial and higher-order characteristic statistics were figured out. Van Gogh's art works of different periods were analyzed through normalized mutual information computing using trained basis function's Gabor transform power, in order to find the diversity of style. The simulation results show that data mining on …

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Research On High Usability Based On Cloud Simulation Platform, Limin Zhou, Yanfang Fu, Wuqi Gao, Gao Xiang, Cheng Bing Aug 2020

Research On High Usability Based On Cloud Simulation Platform, Limin Zhou, Yanfang Fu, Wuqi Gao, Gao Xiang, Cheng Bing

Journal of System Simulation

Abstract: With the increasing complexity of the simulation system, the reliability requirement is also growing. In order to ensure the reliability of the simulation system, a cloud simulation platform was built. Through the research of virtualization and high availability, a set of cloud simulation platform client management program was designed and developed according to the simulation needs. In the process of running, virtual simulation system node migration and analog off network operations were proposed to verify the reliability of the platform disaster. This ensures that the simulation system runs efficiently and stably.

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Fluid Simulation Of Sph Based On Opencl, Miaomiao Xiao, Liu Zhen, Jiabin Shi, Tingting Liu, Cuijuan Liu, Bangquan Liu Aug 2020

Fluid Simulation Of Sph Based On Opencl, Miaomiao Xiao, Liu Zhen, Jiabin Shi, Tingting Liu, Cuijuan Liu, Bangquan Liu

Journal of System Simulation

Abstract: Fluid plays an important role in the Virtual Reality Scene. Physics-based fluid animation can enhance the reality of numerical simulation. The efficiency of fluid animation based on physical computing usually is not real-time rendering without parallel computing. Fluid simulation was proposed based on SPH using OpenCL, which could make full use of the data interoperability of OpenCL and the graphics API, and use the coordination work of CPU and GPU to increase the potential of the hardware; when physics computing, the surface particles and normals based on the Coulomb's law were solved out. The preliminary experiment shows that the …

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Research On Augmented Reality Of Library's Navigation System, Zhou Wei, Lilong Chen, Jianwen Song Aug 2020

Research On Augmented Reality Of Library's Navigation System, Zhou Wei, Lilong Chen, Jianwen Song

Journal of System Simulation

Abstract: Library science is an interdisciplinary or multidisciplinary field, classifying and retrieving books is very tedious and complex, librarians spend a lot of time on tidying books, readers on searching as well. AR (Augmented Reality) was used in library's book searching and navigation. Encoding a book's Id to a two-dimension code marker, using a AR software development kit, and Wi-Fi localization using RSSI(received signal strength), and combining the virtual mark of navigator with the scene of library, the procedure of book searching and borrowing was simplified. The test results indicate that this system benefits to locate the right place of …

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Graphics And Image Local Deformation Based On Moving Least Squares Method, Xiaorong Du, Shuwen Ping, Zhang Yong Aug 2020

Graphics And Image Local Deformation Based On Moving Least Squares Method, Xiaorong Du, Shuwen Ping, Zhang Yong

Journal of System Simulation

Abstract: Combined with Moving Least Squares method, a deformation function based on control points and area was defined. A localization processing method for image deformation was proposed which extended to vector graph deformation. After adding control points to control deformation and setting the target deformation zone as control area, control points were controlled to deform image and vector graph, which could produce affine transformation, similarity transformation and rigid transformation results. Experiments show that, this method can inhibit boundary aliasing as well as ensuring graphics and image local deformation result smoothness. By applying it to vector graph deformation, multiple complex deformation …

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Design And Key Technologies Of Virtual Assembly And Simulation Of Mining, Driving And Transporting Equipment System, Jiacheng Xie, Zhaojian Yang, Xuewen Wang, Yiliang Wang Aug 2020

Design And Key Technologies Of Virtual Assembly And Simulation Of Mining, Driving And Transporting Equipment System, Jiacheng Xie, Zhaojian Yang, Xuewen Wang, Yiliang Wang

Journal of System Simulation

Abstract: For there was no connection among coal mine machinery equipment design, manufacture and its actual work environment, virtual assembly and simulation system, consisting of virtual assembly subsystem, scene simulation and roaming subsystem etc., were realized ultimately, which took shearer, scraper conveyor, roadheader and hoister as the study objects and were supported by double channel prop scene system as the hardware and Visual Studio and Open Scene Graph as the software platform, integrating force feedback, data gloves and other human interface devices, virtual assembly and simulation system made equipment operating status visible in the process of the coal production. In …

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Digital Bathymetry Model For Multibeam Based On Attitude And Terrain Effect, Jiacheng Yu, Xueqiang Xu Aug 2020

Digital Bathymetry Model For Multibeam Based On Attitude And Terrain Effect, Jiacheng Yu, Xueqiang Xu

Journal of System Simulation

Abstract: Aiming at the problems of expensive multibeam system and bumpy ship in bathymetric survey for seafloor, a digital bathymetry model based on depth data according to principle of multibeam mathymetric sonar system was designed, and a correction method of water depth survey due to effect of angular beam-width, vehicle attitude and terrain was given. Accordingly, seafloor was scanned with this model and terrain map was constructed to mimic the realtime terrain. The model and correction were verified by using practical water depth data of certain seafloor. Simulation results show that the model is in accordance with theoretical analysis and …

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Gesture Segmentation And Recognition Based On Kinect Depth Data, Yanming Mao, Liliang Zhang Aug 2020

Gesture Segmentation And Recognition Based On Kinect Depth Data, Yanming Mao, Liliang Zhang

Journal of System Simulation

Abstract: Aiming at the problems that gesture recognition required high environmental background, segmented gesture usually contained wrist data and closing fingers easily caused false recognition, a gesture recognition method based on depth data was proposed. It captured gesture depth map, and it used Hands Generator to obtain the information of palm for gesture segmentation, in order to remove redundant wrist data, the constraint of the palm which looks like a square was added. The number of all the other four fingers except thumb could be acquired with the use of the scanline method, therefore, the width ratio of the adjacent …

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Visual Positioning Technology Research Of Picking Robot Based On Dynamic Target, Juntao Xiong, Xiangjun Zou, Haixin Zou, Hongxing Peng, Ye Min Aug 2020

Visual Positioning Technology Research Of Picking Robot Based On Dynamic Target, Juntao Xiong, Xiangjun Zou, Haixin Zou, Hongxing Peng, Ye Min

Journal of System Simulation

Abstract: A difficult problem of picking robot visual position in the natural environment is the disturbance because of interference factors. The angular size of disturbed fruit was calculated to determine the three states of fruit that static, micro disturbance and large disturbance; For static and micro disturbance litchi, the improved FCM fuzzy clustering method was used to segment litchi image to acquire litchi fruit and fruit stalk, then the Hough linear fitting was used to determine the effective picking area and picking point on the fruit stalk, so realizing the visual space positioning of litchi picking point, and the simulation …

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Research On Evolution Modeling Of Complex Network Based On Priority Of Equipment Capability, Fengqin Zhang, Liang Dong, Guan Hua, Dawu Chen, Xiaoqing Li, Qingfeng Zhang Aug 2020

Research On Evolution Modeling Of Complex Network Based On Priority Of Equipment Capability, Fengqin Zhang, Liang Dong, Guan Hua, Dawu Chen, Xiaoqing Li, Qingfeng Zhang

Journal of System Simulation

Abstract: According to disadvantages of the traditional approaches of complex modeling for description of weapons and equipment on dynamic and uncertainty, referencing to the OODA theory, a new approach for evolution modeling of combat system complex network was put forward based on priority of equipment capability, which had improved BA scale-free networks model by the process of choosing linking objects, defining link edges, backing out of combat nodes and dynamic adjusting to the modeling policy based on the capability values of each nodes of weapon and equipment under particular applications. By simulation experiments, the new approach, which has the features …

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Study On Virtual-Observation Kalman Filter Algorithm Of Multi-Radar Networking, Wenbo Zhao, Hailong Ding, Chenghua Qu, Mo Jun Aug 2020

Study On Virtual-Observation Kalman Filter Algorithm Of Multi-Radar Networking, Wenbo Zhao, Hailong Ding, Chenghua Qu, Mo Jun

Journal of System Simulation

Abstract: Under the circumstances of tracking targets in multi-radar networking (MRN), measure-value in polar coordinates of the networked radar (NR) has the nonlinear relation with state-value of targets tracking coordinates, which does not satisfy linear requirement of Kalman filter algorithm (KFA) application. Virtualizing the tracking coordinates of MRN as the measure coordinates of KFA was introduced. As a result, original nonlinear relation was simplified as a linear form. By means of modeling virtual observation noise and constructing the initialization strategy, KFA could solve state estimation problem in MRN. Simulation analysis and real data verification demonstrate that virtual-observation KFA (VOKFA) has …

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Research On Optimal Slip Frequency Control Of Single-Sided Linear Induction Motor, Xijun Liu, Kunlun Zhang, Chen Yin Aug 2020

Research On Optimal Slip Frequency Control Of Single-Sided Linear Induction Motor, Xijun Liu, Kunlun Zhang, Chen Yin

Journal of System Simulation

Abstract: In order to study the influence of the unique edge effect and normal force of single-sided linear induction motor, the effect of slip frequency on electromagnetic force and normal force output was analyzed based on constant current and constant slip frequency control to achieve optimal slip control. Considering the T-type equivalent circuit of single-sided linear induction motor and the end effect, the numerical relationship between electromagnetic force, normal force and slip frequency was calculated and derived. Combined with computer simulation, the characteristics of electromagnetic force and normal force output under conditions of different speed and different electromagnetic air gaps …

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Model And Simulation Of Traffic Flow Evolutionary Based On Individual Travel Decision Analysis, Zhuojun Li, Xingguang Chen Aug 2020

Model And Simulation Of Traffic Flow Evolutionary Based On Individual Travel Decision Analysis, Zhuojun Li, Xingguang Chen

Journal of System Simulation

Abstract: Travel choice behavior decision-making mechanism was analyzed at first. On this basis, a traffic evolutionary model was present and the relations between the evolutionary process of traffic flow under the route choice behavior, user individual travels decision-making characteristic parameters and external traffic information were investigated by employing simulation platform. Some significant inspiration and meaningful implications are concluded, i.e., the influential effects of individual travel decision-making parameters for flow evolution are quite complicated. The travel service information should be released and used combined with appropriate travelers to maximize the effect of traffic information. These conclusions will help to deepen understanding …

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Study In Plant Modeling And Animation, Yanna Jiang, Boxiang Xiao, Xinyu Guo, Baozhu Yang Aug 2020

Study In Plant Modeling And Animation, Yanna Jiang, Boxiang Xiao, Xinyu Guo, Baozhu Yang

Journal of System Simulation

Abstract: Plant modeling and animation synthesis was widely used in many fields, such as virtual plant, 3D animation, games and so on. The techniques of plant modeling and animation synthesis were reviewed. Plant modeling techniques were discussed in three aspects: fractal and L system approach, imaged-based methods, methods based on three-dimensional measurement data. Plant animation synthesis techniques were analyzed in four aspects: physically-based animation, procedural animation, video-based animation and data-driven animation. Furthermore, some issues in future research were addressed, and further trends and research directions were discussed.

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Co-Simulation And Experiment Of Vehicle Electro-Hydraulic Dynamic Braking System, Cai Pu, Muyi Lin, Zheng Xin, Wen Jian Aug 2020

Co-Simulation And Experiment Of Vehicle Electro-Hydraulic Dynamic Braking System, Cai Pu, Muyi Lin, Zheng Xin, Wen Jian

Journal of System Simulation

Abstract: For now, when vehicle electro-hydraulic brake system is studied, dynamics system and hydraulic system modeling and simulation are usually separated, and that leads to defects in coupling and relevance. In order to satisfy integration design requirements of multi-body system, taking ZL50 loader as an example, the virtual prototype model was set up, and the correctness of the mechanical model was verified by real vehicle tests. The mathematical model of main system components and the hydraulic model of multi-loop electro-hydraulic braking system was established respectively. The experimental results verified the accuracy of hydraulic model by corresponding bench tests. The parameters …

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Virtual Surgery Force Feedback Process Simulation Based On Soft Tissue Deformation Biomechanical Information, Monan Wang, Chengyou Wang, Yuming Liu, Li Zhao Aug 2020

Virtual Surgery Force Feedback Process Simulation Based On Soft Tissue Deformation Biomechanical Information, Monan Wang, Chengyou Wang, Yuming Liu, Li Zhao

Journal of System Simulation

Abstract: For human tissues biomechanical information was obtained from tissue biomechanical model by virtual environment, human soft tissue biomechanical model was developed based on mass-spring modeling method, the biomechanical model was solved by four-order Range-Kuttle method, haptic device was designed based on modularization. Force signal transmission process simulation and obtaining realized force on force feedback device end were completed by connecting virtual haptic device and biomechanical program in ADAMS software. The force feedback process was verified by simulation system. The results show that the haptic can get accurate realtime force information. The study accomplishes simulation of force feedback process based …

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Firing Stability Calculation And Simulation Analysis Of New Large Calibre Machine Gun, Zhiteng Fan, Ruilin Wang, Yongjian Li, Binbin Hua, Wang Kai Aug 2020

Firing Stability Calculation And Simulation Analysis Of New Large Calibre Machine Gun, Zhiteng Fan, Ruilin Wang, Yongjian Li, Binbin Hua, Wang Kai

Journal of System Simulation

Abstract: To study the firing stability of a new large calibre machine gun in different ground environment, the stability model of arms rack and dynamic model of the whole gun were established respectively. The stability condition in clunch and concrete environment was educed, and the force in shoulder which was required for the stability of machine gun was also calculated. Then a dynamic model of this gun at one firing movement was established. Based on this and dynamic simulation software, the muzzle displacement response in different ground environment was obtained. Comparing the simulation result and contrasting with one older machine …

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Automatic Pipelining Mechanism Design For Maize Ear Analysis, Boxiang Xiao, Chuanyu Wang, Xinyu Guo, Wu Sheng, Jianjun Du Aug 2020

Automatic Pipelining Mechanism Design For Maize Ear Analysis, Boxiang Xiao, Chuanyu Wang, Xinyu Guo, Wu Sheng, Jianjun Du

Journal of System Simulation

Abstract: Aiming at automatic character information acquisition for maize ear analysis, a pipelining mechanism was designed including two main modules: weight measurement and images collection. The system supported automatic collection of weight data and images in batches. And then, the system was analyzed in mechanical properties by kinematic parameters. A three-dimensional simulation system was developed by use of computer graphics technologies to evaluate the performance of the presented pipelining mechanism. The feasibility of the design for maize ear analysis was discussed, which can support high precise and efficient maize ear analysis as a practical tool and technical references.

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Modeling And Analyzing Of Battlefield Information Sharing Effectiveness Based On Complex Networks, Zhang Qiang, Jianhua Li, Shen Di Aug 2020

Modeling And Analyzing Of Battlefield Information Sharing Effectiveness Based On Complex Networks, Zhang Qiang, Jianhua Li, Shen Di

Journal of System Simulation

Abstract: Battlefield information sharing is the basis of acquiring information superiority to get decision and action superiority in information war。Aiming at the influence of information sharing on operational effectiveness, internal essence of the information sharing activity in information warfare was qualitatively descripted. By using operational network model which clearly reflects node's function and edge's type, the operational network with different information sharing degree was constructed, and the characteristic which depicts information sharing effectiveness was defined, and the influence law of information sharing degree on sharing effectiveness measurement indexes of operational network with simulation was analyzed. The simulation result validates that …

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State Event Detecting Algorithm For Hybrid System Based On Interval Newton's Method, Haiyan Wang, Yihuai Hu Aug 2020

State Event Detecting Algorithm For Hybrid System Based On Interval Newton's Method, Haiyan Wang, Yihuai Hu

Journal of System Simulation

Abstract: Accurately detecting of state events is critical for hybrid dynamic systems,especially for systems with singularities or event functions with multiple roots. A carefully constructed extrapolation polynomial among state value of past time points was applied to predict values of event functions. The polynomial was derived from a variable-step multi-step integration method. The extended interval Newton's method was employed to find all roots in a certain time interval. Due to no using of values of future time points, the polynomial can be employed to determine the integration step size by checking potential events in systems with model singularities. The procedure …

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Research And Simulation Of Equalization Algorithm Suitable For High-Order Qam Signals, Wang Yan, Shen Pan, Wang Chao Aug 2020

Research And Simulation Of Equalization Algorithm Suitable For High-Order Qam Signals, Wang Yan, Shen Pan, Wang Chao

Journal of System Simulation

Abstract: Traditional dual-mode blind equalization algorithm is based on constant modulus channel equalization, its convergence is slow, and it has a low efficiency of bandwidth. For overcoming its shortcoming, two blind equalization algorithms suitable for high-order QAM signals were proposed. These are double mode multi-module equalization algorithm (DMMA) and semi-blind equalization algorithm (SBEA). DMMA used multi-module equalization algorithm as first mode and multi-module assistant equalization algorithm as second mode, both modes simultaneously equalized the signal. For achieving a fastest convergence and lowest error rate, DMMA's result was regard as the pilot data for least mean square algorithm (LMS), which is …

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