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4,223 full-text articles. Page 113 of 209.

Modeling And Simulation Of Offshore Support Vessel Anchoring Operation, Hongbo Sun, Chaojian Shi, Wenjin Lin 2020 1. Merchant Marine College, Shanghai Maritime University, Shanghai 200135, China;;2. Navigation College, Jimei University, Xiamen 361021, China;;

Modeling And Simulation Of Offshore Support Vessel Anchoring Operation, Hongbo Sun, Chaojian Shi, Wenjin Lin

Journal of System Simulation

Abstract: In order to understand the configurations of mooring line and working wire, tension variation at release point of working wire and the influence of the offshore support vessel during anchoring operation, a mathematical models of OSV anchoring operation was established. According to the MMG (Ship Manoeuvring Mathematical Model Group) ship motion mathematical modeling theory, a 6dof ship motion mathematical model was built. And a 6dof cable motion mathematical model was established with finite difference method. A coupling ship-cable-anchor-cable system model was established. The system motion simulations were carried out, and the results indicate that the model …


Modeling And Simulation Of Boiler Superheated Steam Temperature System Based On System Dynamics, Le Wei, Yuanyuan Yan 2020 1. School of Control and Computer Engineering, North China Electric Power University, Baoding 071003, China;;

Modeling And Simulation Of Boiler Superheated Steam Temperature System Based On System Dynamics, Le Wei, Yuanyuan Yan

Journal of System Simulation

Abstract: Based on the principle of system dynamics, from the perspective of mass and energy conservation, taking the causal loop diagrams and the stock and flow diagrams as the carriers, and starting from the running mechanism of the system, the system dynamics model for the boiler superheated steam temperature system was established. This model has clear structure and reasonable complexity. By using the high temperature super-heater of the 300 MW boiler-turbine unit of Hebei Qingyuan Power Plant as the research object, simulation studies were carried out in Vensim PLE environment. The simulation curves were compared with the curves of …


Modeling And Simulation On Dynamics Of Epidemic Disease Based On Social Division Of Labor, haibin Li 2020 1. Engineering Training Center of Inner Mongolia University of Technology, Hohhot 010051, China; ;

Modeling And Simulation On Dynamics Of Epidemic Disease Based On Social Division Of Labor, Haibin Li

Journal of System Simulation

Abstract: Prediction is an essential part of the epidemic prevention and control system, and it is of great significance to accurately establish a dynamic model of epidemiological evolution. The existing epidemiological modeling methods rarely consider the social division of labor of different groups. The entire group is divided into three subgroups, the ordinary residents, the social service personnel, and the front-line medical workers. Based on the heterogeneous uniform mixing theory, the subgroup adjacency matrix is used to represent the contact relationship between individuals, and a time-lapse dynamic model of epidemic spread and evolution is established. The simulation results show that …


Combining Crf And Deformable Part Model For Pedestrian Detection, Ma Ji, Jingjiao Li, Ma Li, Zhao Yue 2020 1. School of Information Science & Engineering, Northeastern University, Shenyang 110819, China;;2. School of Information, Liaoning University, Shenyang 110036, China;;

Combining Crf And Deformable Part Model For Pedestrian Detection, Ma Ji, Jingjiao Li, Ma Li, Zhao Yue

Journal of System Simulation

Abstract: Pedestrian detection has been widely used in many fields. It is one of the focus in computer vision. The part-based detection method in the pedestrian detection shows excellent performance and has a strong adaptability in posture change of human body. But it is not good for Occlusion problem. When the Discriminative threshold is higher, miss rate is very high. Considering the disadvantage of LSVM method for mining hidden information, a two layers classifier was proposed based on the deformable parts model establishing conditional random field model for Occlusion problem. For learning model parameters, the stochastic gradient descent and …


Planar Structure Reconstruction For Indoor Scenes With Kinectfusion, Chenjianong Cai, Yifei Shi, Xu Kai, Dang Gang 2020 1. National University of Defence Technology, Changsha 410073, China;;2. Visual Computing Center, Shenzhen Institutes of Advanced Technology, Shenzhen 518055, China;

Planar Structure Reconstruction For Indoor Scenes With Kinectfusion, Chenjianong Cai, Yifei Shi, Xu Kai, Dang Gang

Journal of System Simulation

Abstract: Online scanning and reconstruction with KinectFusion has greatly improved real-time reconstruction of indoor scenes with consumer depth camera. However, due to the limitation of depth resolution of current depth cameras, the quality of reconstructed scenes is in general unsatisfactory. This is especially true for planar structures which are commonly seen in indoor scenes and important in defining the major structure of an indoor room. A novel method was proposed for extracting and reconstructing planar structures from point clouds of indoor scenes scanned acquired by KinectFusion.


Simulation Model Of Crowd Following Phenomenon In Emergencies, Fang Hao, Liu Zhen, Lu Tao, Liangping Liu, Tingting Liu, Cuijuan Liu 2020 Faculty of Information Science and Technology, Ningbo University, Ningbo 315211, China;

Simulation Model Of Crowd Following Phenomenon In Emergencies, Fang Hao, Liu Zhen, Lu Tao, Liangping Liu, Tingting Liu, Cuijuan Liu

Journal of System Simulation

Abstract: Researches on crowd behavior in emergent events are important practical significance for emergency management, most of the current crowd models are collision detection, motion plan and so on. According to the emergency scene analysis of surveillance video, following behaviors of crowd are obviously, modeling following behaviors is an interesting topic in crowd simulation. A following model was proposed based on classical social force model and OCEAN personlity theory, the concept of panic was introduced,, and following conditions of individual was set up, the speed formulas of individual were constructed. Experimental results show that the following model can closely simulate …


Real-Time Rendering Of Large-Scale Coastal Water Based On Adaptive Optimization, Shunli Wang, Fengju Kang, Jianhua Xu 2020 1. School of Marine Technology, Northwestern Ploytechnical University, Xi'an 710072, China;;2. National Key Laboratory of Underwater Information Process and Control, Xi'an 710072, China;

Real-Time Rendering Of Large-Scale Coastal Water Based On Adaptive Optimization, Shunli Wang, Fengju Kang, Jianhua Xu

Journal of System Simulation

Abstract: Focusing on the complex of the wave model and the poor performance of real-time in the large-scale coastal water visualization, a new method based on adaptive optimization for coastal water rendering in real-time was proposed. By introducing the automatic merging algorithm, the complex wave model could be constructed. According to the collision detection technology, the water mesh could be adaptively optimized. In order to improve the realistic, a noise was added to the water surface. The foam and reflection were realized by applying the dynamic texture mapping technology. The experimental results show that the generated coastal water has higher …


Advances In Research And Application Of In-Situ Visualization, Wang Fang, Sikun Li, Zhao Dan, Zeng Liang 2020 1. School of Computer, National University of Defense Technology, Changsha 410073, China;;2. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;

Advances In Research And Application Of In-Situ Visualization, Wang Fang, Sikun Li, Zhao Dan, Zeng Liang

Journal of System Simulation

Abstract: Scientific-Visualization is the most effective means of analyzing numerical simulation data. With the continuous improvement of the high performance computing technology, numerical simulation scale is growing rapidly. It is very difficult to analyze large scale parallel numerical simulation data efficiently due to the limits of IO bandwidth, storage system capacity and post processing pattern of visualization. In-situ visualization utilized the same computer system that ran the simulation tasks to operate visual computing and rendering, so it could overcome the limits of IO and storage system. The advances of in-situ visualization in recent years were reviewed, including data management, large-scale …


Sparse Representation Based Private Face Recognition In The Cloud, Liu Yan, Jin Xin, Zhao Geng, Xiaodong Li, Yingya Chen, Guo Kui 2020 1.Beijing Electronic Science and Technology Institute, Beijing 100070, China;;2.Xidian University, Xi'an 710071, China;

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 …


Design And Realization Of Optimization System For Rice Type, Weilong Ding, Lifeng Xu, Wei Yang, Gao Nan 2020 College of Computer Science & Technology, Zhejiang University of Technology, Hangzhou 310023, China;

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 2020 1. Kunming University of Science and Technology, Kunming 650500, China;;

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 …


Synthetic Aperture Radar Signal Simulation Of Ships On Sea Surface, Guijie Diao, Xiaojian Xu, Ni Hong, Junjie Lu 2020 1. Beijing Electro-mechanical Engineering Institute, Beijing 100074, China;;

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 …


Discrete-Event Simulation-Engine Technology Based On Mailbox-Mechanism In C4Isr System, Wendi Cheng, Fengxin Sun, Chu Wei 2020 1. The 28th Research Institute of China Electronic Group Corporation, Nanjing 210007, China;;2. Science and Technology on Information Systems Engineering Laboratory, Nanjing 210007, China;

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 2020 1. School of Foreign Languages, Dalian Maritime Univ., Dalian 116026, China;;

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 2020 1. She Wai School, Central South University of Forestry and Technology, Changsha 410004, China;;

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 …


Calculation Of Vessel's Geometric Properties Based On Stl Model, Chunlei Liu, Yin Yong, Xiaofeng Sun, Xiufeng Zhang 2020 Navigation College, Dalian Maritime University, Dalian 116026, China;

Calculation Of Vessel's Geometric Properties Based On Stl Model, Chunlei Liu, Yin Yong, Xiaofeng Sun, Xiufeng Zhang

Journal of System Simulation

Abstract: To improve the accuracy of the ship geometric properties calculation and the real-performance of the program, a method based on STL triangular mesh model was proposed to calculate the ship geometric properties. SH polygon clipping algorithm in computer graphics was used to calculate the intersection of ship and water plane. By using of coordinates systems affine transformation, 3D water plane was changed to 2D plane to extract the profile contour. Because the waterlines are monotone polygon, Mass center insertion method was proposed to finish polygon triangulation, computing speed was improved. Bulk carrier "Taihang 128" was taken as an …


Salient Region Detection Based On Object-Biased Gaussian Refinement And Global Contrast, Cai Qiang, Ziyu Xue, Dianhui Mao, Haisheng Li 2020 1. School of Computer and Information Engineering, Beijing Technology and Business University, Beijing 100048, China;;2. Beijing Key Laboratory of Big Data Technology for Food Safety, Beijing Technology and Business University, Beijing 100048, China;

Salient Region Detection Based On Object-Biased Gaussian Refinement And Global Contrast, Cai Qiang, Ziyu Xue, Dianhui Mao, Haisheng Li

Journal of System Simulation

Abstract: In view of the disadvantages such as the incomplete detection in image boundary which is caused by the global contrast significance detection algorithm, a visual saliency detection algorithm was proposed named salient region detection based on object-biased Gaussian refinement and global contrast. After segmentation based on graph, the global contrast was used to calculate the saliency value of each segmentation blocks. According to the location of the salient object, the center of the Gaussian model was adjusted. Both saliency detection value and Gaussian model combined effect of the final saliency values. The method paid attention to the …


Research On 3d Airway Trees Segmentation And Centerline Extraction Algorithm, Yanbo Li, Yu Xiang 2020 College of Computer Science and Technology. Heilongjiang Institute of Technology, Harbin 150050, China;

Research On 3d Airway Trees Segmentation And Centerline Extraction Algorithm, Yanbo Li, Yu Xiang

Journal of System Simulation

Abstract: Centerline extraction plays an important role in virtual bronchology. Organ segmentation and centerline extraction with correct topology structure is very difficult, especially for multiple branching structure organs. Therefore, a 3D airway tree segmentation and centerline extraction algorithm was proposed. A new region growing method was proposed to extract the main branch and sub-branch. The initial center was extracted based on the relationship of adjacent section. The center was corrected by computing the value of the determinant of Jacobian matrix, and the path with all the points was generated by Dijkstra's shortest path algorithm. The experimental results show that …


Molecular Dynamics Of Fluid Properties By Spanwise Oscillations Of Solid Wall, Haijun Dong, Xiaoqing Lu, Haopeng Zhang, Mingming Shan 2020 School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China;

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 Of Diffusion-Based Molecular Oscillation And Synchronization In Nanonetworks, Feiyan Li, Lin Lin, Shiwei Ma 2020 School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200072, China;

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 …


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