Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Simulation (135)
- Path planning (76)
- Genetic algorithm (48)
- Deep learning (46)
- Digital twin (46)
-
- Numerical simulation (45)
- Virtual reality (42)
- Multi-objective optimization (40)
- Modeling and simulation (39)
- Particle swarm optimization (35)
- Reinforcement learning (35)
- Modeling (33)
- Fault diagnosis (29)
- Attention mechanism (28)
- Deep reinforcement learning (28)
- UAV (26)
- Neural network (25)
- Simulation model (25)
- System simulation (24)
- Complex network (22)
- System dynamics (21)
- Virtual simulation (21)
- Visualization (21)
- DRL (20)
- Optimization (19)
- Trajectory planning (19)
- Multi-agent (18)
- Parameter identification (17)
- Permanent magnet synchronous motor (17)
- Traffic simulation (17)
- Publication Year
Articles 2071 - 2100 of 3924
Full-Text Articles in Entire DC Network
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 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.
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 …
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 …
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 …
Research And Application Of Multidisciplinary Optimization Technology Based On Virtual Prototyping, Tao Luan, Junhua Zhou, Baocun Hou
Research And Application Of Multidisciplinary Optimization Technology Based On Virtual Prototyping, Tao Luan, Junhua Zhou, Baocun Hou
Journal of System Simulation
Abstract: The main body of the article briefed the total frame, composing, application case of multidisciplinary optimization technology for weapon equipment system,and introduced 5 kinds of multidisciplinary optimization method detailedly. It took a certain equipment's virtual prototyping optimization design requirement in the engineering develop phase as the background, and advanced the way of multidisciplinary virtual prototyping optimization based on local subsystem analysis viably, shortened form LSA-IDF. Then through an actual case application, the article constructed the weapon equipment system's virtual prototyping optimization design flow, actualized intelligent optimization design based on virtual prototyping. Finally it sums up the applying …
Design And Implementation Of Electromagnetic Spectrum Visualization System, Bin Fang, Ma Jie, Keyu Sun
Design And Implementation Of Electromagnetic Spectrum Visualization System, Bin Fang, Ma Jie, Keyu Sun
Journal of System Simulation
Abstract: Battlefield environment, filled with all kinds of devices with frequency electromagnetic signals, results in complex and rapidly changing electromagnetic environment. And the uncertainty brought by the complexity and the time variability not only makes it hard to predict the result of a war, but also leads to higher requirements for the current electromagnetic visualization platform serving for decision. To satisfy the visual needs for the electromagnetic spectrum data in the battlefield environment, the electromagnetic spectrum trend was designed in the perspective of temporal, spatial, frequency, and the energy domain. Four situations were proposed: equipment frequency radiation situation, spectrum …
Integrated Modeling Method Of Flight Director And Guarantee Process, Yongliang Luo, Zhang Jun, Yuanhui Qin, Han Sheng, Yuanming Wang
Integrated Modeling Method Of Flight Director And Guarantee Process, Yongliang Luo, Zhang Jun, Yuanhui Qin, Han Sheng, Yuanming Wang
Journal of System Simulation
Abstract: The flight director and guarantee process as a kind of typical complex process, the modeling problem has become the current hot and difficult problem in the research field of the complex processes. An integrated modeling method of flight director and guarantee process was proposed combined with the typical process equipment air command and support building requirements. The following several aspects were mainly elaborated: The meta model of flight director process, service operation sequence modeling, machine process choreography. A prototype simulation and evaluation system was developed, and the rationality of the proposed method was analyzed combined with the application example.
Study On Key Techniques About Refueling Simulation In Air, Hongtu Li, Guan Wei, Jijiang Song, Guangxing Zhao, Zewei Ma
Study On Key Techniques About Refueling Simulation In Air, Hongtu Li, Guan Wei, Jijiang Song, Guangxing Zhao, Zewei Ma
Journal of System Simulation
Abstract: The four key techniques of refueling flight simulation are studied on the base of a modern avion effective refueling flight simulation in the air. Characteristic of the usual scene simulation techniques is analyzed and the best scene simulation solution is found out, the theories of vortex interference and control & stability are explored deeply, and the models of vortex interference and control & stability are built with engineer data, system real time performance is researched, and the irregular back and fro of the refueling plane is worked off. the ideal result is harvested.
Research And Application Of Improved Cmms Descriptive Method, Shengjie Wang, Fengju Kang, Han Hong
Research And Application Of Improved Cmms Descriptive Method, Shengjie Wang, Fengju Kang, Han Hong
Journal of System Simulation
Abstract: In order to describe both the hybrid Agent behaviors and the mission space during the description process of combat system, the advantages of the PICS method and the CMMS describe method were combined. The ETDB describe method which stood for the entity was proposed by expanding the four factors of the CMMS describe method and was used for dividing the elements of MCSSU(The Man-machine Cooperative-combat System of Submarine and UUVs Formation) and concept modeling, and by describing an example, the method is compared with the traditional one. The concept models of MCSSU were formalized described by UML. The …
A Research Of Virtual Human Assembly Intelligent Simulation Technology, Yunfei Yang, Gu Yan, Xiumin Fan, Qichang He, Shiguang Qiu
A Research Of Virtual Human Assembly Intelligent Simulation Technology, Yunfei Yang, Gu Yan, Xiumin Fan, Qichang He, Shiguang Qiu
Journal of System Simulation
Abstract: Virtual human assembly simulation is an important part of virtual assembly simulation, and it is also a key link in the process of product design verification. To simulate the human operation more accurately, efficiently and really has been the research focus of the related areas. For the human body, which could be taken as a complex movement system, a multi rigid body model was built in virtual environment; the model was divided into different joint chains according to the operating characteristics of the human body and ergonomics knowledge was used to construct the model's optimal target function; a multi-objective …
Parallel Radiosity Based Light Distribution Simulation Within Virtual Plant Canopy, Can Hou, Liyu Tang, Chongcheng Chen, Yifei Yang
Parallel Radiosity Based Light Distribution Simulation Within Virtual Plant Canopy, Can Hou, Liyu Tang, Chongcheng Chen, Yifei Yang
Journal of System Simulation
Abstract: Owing to the computing-cost calculation of the form factor and the radiation energy in the traditional radiosity, a new method of parallel radiosity Based on CUDA (Compute Unified Device Architecture) was proposed to improve the performance of the implementation. Specifically, the implementation processes were as follows. The detailed 3D plant canopy model was loaded in the virtual scene. The solar altitude angle, solar azimuth and the radiation intensity were estimated according to the given time and the geographic location, and the light panel was generated afterwards, which was defined as radiation source on the basis of uniform triangular subdivision. …
Batched 3d Reconstruction Of Uav Images Fused Low Precision Position And Orientation Parameters, Xuefeng Cao, Qinghe Wang, Lixiang Xie
Batched 3d Reconstruction Of Uav Images Fused Low Precision Position And Orientation Parameters, Xuefeng Cao, Qinghe Wang, Lixiang Xie
Journal of System Simulation
Abstract: The images sequence captured by UAV has the high resolution and high overlapping characteristics, so it is used in a wide range of scene reconstruction. However, the result of these state-of-art multi-view 3D reconstruction algorithms is unstable when dealing with large-scale UAV thousands of images. In this regard, the UAV low accuracy GPS / IMU parameters sequence was fused to the large-scale UAV image reconstruction process and the UAV sequence batched image reconstruction method was proposed. The image matching time and false matching number was reduced by using low-precision GPS / IMU priori information. Through the establishment of a …
Gpu-Based Fluid Collision Detection Method With Surface Of Three-Dimensional Scenes, Liangping Liu, Liu Zhen, Fang Hao, Cuijuan Liu, Tingting Liu
Gpu-Based Fluid Collision Detection Method With Surface Of Three-Dimensional Scenes, Liangping Liu, Liu Zhen, Fang Hao, Cuijuan Liu, Tingting Liu
Journal of System Simulation
Abstract: Virtual simulation of fluid phenomena is of great value, and SPH fluid simulation-based method can truly reflect the motion of the fluid. However, as the size of the fluid increasing, the computation becomes large, especially fluid collision detection in complex scenes significantly reduces the efficiency of fluid simulation. By using GPU to accelerate SPH physical calculation and collision detection, and use of new neighbors particles chain table building method for particles searching, can improve fluid simulation efficiency. By using voxel scene rasterization of sampling methods, the calculation of collision detection was speeded up, and the storage space was saved …
Improved Pivoting Ball Algorithm For Nonuniform Point Cloud Data, Silan Hu, Mingquan Zhou, Wuyang Shui, Zhongke Wu
Improved Pivoting Ball Algorithm For Nonuniform Point Cloud Data, Silan Hu, Mingquan Zhou, Wuyang Shui, Zhongke Wu
Journal of System Simulation
Abstract: Ball Pivoting algorithm is mainly used for surface reconstruction of point cloud data, the algorithm starts from a seed triangle, the ball along the seed triangle a side of rotation until the ball is exposed to a point and the edge and the composition of a triangle. The main disadvantage of this algorithm is that when the point cloud data is not uniform when the ball in the rolling process does not contact the point, and therefore will have a hole. A non-uniform point cloud data for improved reconstruction of the Ball Pivoting algorithm of the original point cloud …
Ship Stern Wave Reconstruction From Single Viewpoint Video, Yafei Guo, Yichao Yao, Lu Ying, Zhiyong Su
Ship Stern Wave Reconstruction From Single Viewpoint Video, Yafei Guo, Yichao Yao, Lu Ying, Zhiyong Su
Journal of System Simulation
Abstract: To simulate the ship track in the marine virtual battle environment, a novel algorithm based on the single viewpoint video was proposed to reconstruct the ship stern wave. Gaussian filter was used to preprocess the video image and extract the long tail region from the video image; SFS algorithm was employed to compute the height field of the ship stern wave and generate its grid mesh; The normal of each vertex was computed based on the CUDA technology. The experimental results show that the reconstructed stern wave yields a good sense of reality. At the same time, it …
Research On Skin Color Image Post-Processing Methods For Gesture Recognition System, Renda Wang, Yin Yong, Shengwei Xing
Research On Skin Color Image Post-Processing Methods For Gesture Recognition System, Renda Wang, Yin Yong, Shengwei Xing
Journal of System Simulation
Abstract: Skin color region image post-processing methods suitable for gesture recognition system based on computer vision was proposed. To solve the problem of face and hand often occur simultaneously in the image frame, the training process and grouping strategy of AdaBoost face detector based on Haar-like template were studied, and a rapid culling method of face region based on fusion of color information was proposed. To reduce the influence of noise in skin color region image, impulse noise suppression and skin-like region rejection was proposed. The test results have shown that the proposed methods can greatly speed up the face …
Optimize Visual Hull With Concave Based On Depth Map, Guojun Chen, Wei Xin
Optimize Visual Hull With Concave Based On Depth Map, Guojun Chen, Wei Xin
Journal of System Simulation
Abstract: Traditional method based on color image can recover the boundary of an object, but it can't recover the concave part. Although reconstruction based on depth image can revert the concave part, but the result has bad boundary which means that the edge information lost seriously. The method that fused the depth and RGB image was proposed to solve the individual shortcomings. Based on space subdivision the origin visual hull was computed based RGB image and depth image individually. In the following step, the two type visual hulls were combined for analyzing concave area and then fused into one. A …
Research Of Light Weight 3d Models Repository And Key Techologies, Zhou Wen, Jinyuan Jia, Laixiang Wen, Zhao Long
Research Of Light Weight 3d Models Repository And Key Techologies, Zhou Wen, Jinyuan Jia, Laixiang Wen, Zhao Long
Journal of System Simulation
Abstract: With the development of computer graphics, the demand of the 3D model based on the Internet is growing; the related 3D models repository platform and service have emerged. The prototype system of 3D lightweight models repository, at the same time, it introduced the related cloud platform architecture and the framework of system platform was proposed and realized, moreover, the realized process of the system and some related key technologies were introduced, including lightweight JSON conversion algorithm, dynamic transaction management mechanism, adapter-based dynamic model loading mechanism, lightweight progressive meshes algorithm, sketch-based retrieval Using Content-Aware Hashing. …
Constructing Panoramic High Dynamic Range Image Based On Different Amounts Of Exposures, Quan Wei, Wang Ying, Yanchun Wang, Xuyang Wang, Yunrui Zhu
Constructing Panoramic High Dynamic Range Image Based On Different Amounts Of Exposures, Quan Wei, Wang Ying, Yanchun Wang, Xuyang Wang, Yunrui Zhu
Journal of System Simulation
Abstract: A method of constructing panoramic high dynamic range image was proposed. The classical method about different amounts of exposures was adopted by choosing sampling point carefully to generate better response curves for each child camera of the panoramic camera. Weighted method was applied to obtain panoramic response curve based on six response curves of each child camera. According to characteristics of spatial frequency, a template of panoramic image was selected, so as to complete the synthesis of high dynamic panoramic image. Experiments show that the response curve of panoramic camera can better reflect the characteristics, so the …
Three-Dimensional Virtual Simulation Of Overflow Dam, Guisheng Fang, Hongfa Wang
Three-Dimensional Virtual Simulation Of Overflow Dam, Guisheng Fang, Hongfa Wang
Journal of System Simulation
Abstract: Overflow dam is one of hydraulic structures widely used in the water conservancy projects. The surface structure of overflow dam and the open mode of sluice gate have huge influence to the flood flow. The Navier-Stokes equation was used as the turbulence control equation. The Smoothed Particle Hydrodynamics method was used to simulate the 3D flood flow. The shape of water flow and the distribution of pressure and the distribution of flow velocity were respectively analyzed in the case of different gate opening state. The experimental results show that the virtual simulation of overflow dam is the same as …
Title Medical Image Fusion Based On Multi-Scale Coefficient Decomposition Framework, Kaifeng Wen, Bingjian Li
Title Medical Image Fusion Based On Multi-Scale Coefficient Decomposition Framework, Kaifeng Wen, Bingjian Li
Journal of System Simulation
Abstract: The main purpose of medical image fusion is to obtain a high resolution image with as much details as possible for diagnosis. Magnetic resonance (MR) and computed tomography (CT) medical images has special sophisticated and complementary characteristics which are required for accurate diagnosis of disease. Based on this, a new medical fusion approach for MR and CT images based on multi-scale coefficient decomposition framework was proposed. The proposed approach used a combination of discrete wavelet and non-subsampled shearlet transforms for the initial multi-scale decompositions firstly. The decomposition multi-scale coefficients were fused twice using various local activity measures. The …
Discontinuous Hierarchical Data Visualization Method Based On Themeriver Model, Yuangang Zhen, Chen Yi, Liu Ying, Ruijun Liu
Discontinuous Hierarchical Data Visualization Method Based On Themeriver Model, Yuangang Zhen, Chen Yi, Liu Ying, Ruijun Liu
Journal of System Simulation
Abstract: For traditional ThemeRiver model which has poor performance support to characteristics of discrete data, a kind of visualization method based on improved ThemeRiver model was put forward, which was applied to discontinuous data. All data was put into several time slots and was counted respectively, and new data was added in the time slot which lack data. Gaussian model was adopted to fit curve. After ordering layout, selecting themes' color and arranging the labels, a layout was proposed which has prediction function and can show the hierarchical characteristic. For the hierarchy, the same color family was used to …
Virtual Needle Insertion And Haptic Interaction, Gao Zhan, Pan Fei, Jiehua Wang, Haiyan Pan, Zhengzheng Jiang
Virtual Needle Insertion And Haptic Interaction, Gao Zhan, Pan Fei, Jiehua Wang, Haiyan Pan, Zhengzheng Jiang
Journal of System Simulation
Abstract: Needle insertion or puncture has been widely practiced in clinical medicine. A VR based training system for needle insertion was implemented in this study. The mechanical model during insertion process was designed. Linear element model was applied to realize the simulation of soft tissue deformation. The friction and the stick-slip motion model between the puncture needle and the soft tissue were implemented to simulate the force interaction between needle and soft tissue. The haptic interaction of needle insertion was realized as well to enhance the user experience. The experiment results show that the simulation can reflect the process …
Algorithm For Sea Ice Model Scene Management Based On Spatial Index, Yuhao Sun, Yin Yong, Yicheng Jin, Gao Shuai
Algorithm For Sea Ice Model Scene Management Based On Spatial Index, Yuhao Sun, Yin Yong, Yicheng Jin, Gao Shuai
Journal of System Simulation
Abstract: In the process of modeling for scene visualization in marine simulator, ice region scene needs plenty of sea ice. Because of the numerous sea ice models, it may cause huge waste of time and space then make the whole simulation system in a poor real-time visualization situation, if there is no scientific or effective method. Applying quad-tree spatial index algorithm to sea ice dynamic modeling and management in ice region scene system of marine simulator, it could reduce consumption of time and space resources, improve the whole system fluency, and optimize the visualization of sea ice scene. And it …
Pedestrian Dynamic Aggregation Simulation Model With Emotional Affection, Xiang Nan, Lingyun Zhu, Mingmin Zhang
Pedestrian Dynamic Aggregation Simulation Model With Emotional Affection, Xiang Nan, Lingyun Zhu, Mingmin Zhang
Journal of System Simulation
Abstract: In order to improve the fidelity of dynamic aggregation process of virtual pedestrian, the relationship between gathering process and emotion contagion were simulated by integrating individual emotional interaction into crowd model. Individuals within the crowd firstly chose moving target and produced aggregation according to their expectation. The gathering process propagated the influences of target through the emotional interaction of individuals. The propagated influences affected individuals' expectation which made further efforts on crowd aggregation. Social force for simulating moving individuals and heat conduction theory were adopted by the model to simulate the emotional contagion of the crowd. Experimental results show …
Dark Color Image Segmentation Method Integrated Mrf & Retinex, Yongchun Miao, Cheng Yan
Dark Color Image Segmentation Method Integrated Mrf & Retinex, Yongchun Miao, Cheng Yan
Journal of System Simulation
Abstract: Given the interference from noise, poor quality and low identification of the night images, it is difficult to segment them by traditional color image segmentation method. Therefore, a novel dark color image segmentation method integrated MRF&Retinex was proposed. The -LPG-PCA filtering model was built to filter out noise of an image. The recovery function of the denoised image was constructed, before converting RGB color space to HSV color space, and the MRF & Retinex model was built for image enhancement and color correction operation. The denoised and enhanced color image was segmented by the MRF&FCM …
Research For Skeleton Tree Matching Of Microscopic Image Of Diatom Cells, Xiaoyan Qiao
Research For Skeleton Tree Matching Of Microscopic Image Of Diatom Cells, Xiaoyan Qiao
Journal of System Simulation
Abstract: The image analysis technology based on morphological differences has become an important method of algae recognition in recent years. A skeleton similarity matching method was proposed to recognize microscopic images of diatom cells. The gray surface vector model of image was established to make segmentation by keeping obscure seta; The skeleton was used to represent the Chaetoceros, and it was decomposed hierarchically by competition strategy. The Chaetoceros object was represented by skeleton tree by forming the rachis elements and branches into it. The similarity mode for microscopic images of Chaetoceros was established by defining the topological and geometric difference. …
Interactive Point Based Method For Soft Tissue Deformation In Surgical Simulation, Junliang Shan, Weixin Si, Xiaomeng Li, Wang Qiong, Yanjun Peng, Zhiyong Yuan, Pingan Wang
Interactive Point Based Method For Soft Tissue Deformation In Surgical Simulation, Junliang Shan, Weixin Si, Xiaomeng Li, Wang Qiong, Yanjun Peng, Zhiyong Yuan, Pingan Wang
Journal of System Simulation
Abstract: Although recent years have witnessed great improvement in the research of biomechanical simulation with user interactions for surgical simulation, it still suffers from many challenges such as computational model of soft tissue undergoing large deformation, collision detection, volume conservation, etc. A simple and efficient framework was proposed to meet these challenges. To well reproduce the mechanical response of organs, point based method was used to model the elastic solids undergoing large deformations. In addition, position based dynamics was adopted to model the objects collision, friction and volume conservation, which considerably improved the real-time performance and stability of complex interactions …
Human Action Recognition Method Based On Key Frames, Xiangbin Shi, Shuanpeng Liu, Deyuan Zhang
Human Action Recognition Method Based On Key Frames, Xiangbin Shi, Shuanpeng Liu, Deyuan Zhang
Journal of System Simulation
Abstract: More and more researchers have begun to study the human action recognition based on depth information and skeleton information since the Kinect has been released. A method of human action recognition based on the skeleton feature of key frames is proposed in order to improve the accuracy and timeliness of the human action recognition, and reduce the computational complexity. The clustered data was obtained by using K-means clustering algorithm, and then the key frames were extracted by using the clustered data. Two features for human action recognition were extracted, one is the feature of the position of human joint, …