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Articles 4591 - 4620 of 13783

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

Batched 3d Reconstruction Of Uav Images Fused Low Precision Position And Orientation Parameters, Xuefeng Cao, Qinghe Wang, Lixiang Xie Aug 2020

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 …

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Algorithm For Sea Ice Model Scene Management Based On Spatial Index, Yuhao Sun, Yin Yong, Yicheng Jin, Gao Shuai Aug 2020

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 …

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Gpu-Based Fluid Collision Detection Method With Surface Of Three-Dimensional Scenes, Liangping Liu, Liu Zhen, Fang Hao, Cuijuan Liu, Tingting Liu Aug 2020

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 …

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Improved Pivoting Ball Algorithm For Nonuniform Point Cloud Data, Silan Hu, Mingquan Zhou, Wuyang Shui, Zhongke Wu Aug 2020

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 …

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Ship Stern Wave Reconstruction From Single Viewpoint Video, Yafei Guo, Yichao Yao, Lu Ying, Zhiyong Su Aug 2020

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 …

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Research On Skin Color Image Post-Processing Methods For Gesture Recognition System, Renda Wang, Yin Yong, Shengwei Xing Aug 2020

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 …

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Salient Region Detection Based On Object-Biased Gaussian Refinement And Global Contrast, Cai Qiang, Ziyu Xue, Dianhui Mao, Haisheng Li Aug 2020

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 …

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Evaluation Method Of Dimensional Visual Effects Based On Improved Grey Clustering, Yanyang Zeng, Panpan Jia Aug 2020

Evaluation Method Of Dimensional Visual Effects Based On Improved Grey Clustering, Yanyang Zeng, Panpan Jia

Journal of System Simulation

Abstract: Currently, the assessment of the three-dimensional visual effects is concentrated on the assessment methods, while ignoring the role of the index system. Therefore, an index system about fidelity evaluation of the visual simulation was proposed, including the various steps of the construction of the entire visual simulation system. The steps are from three-dimensional modeling to the output of simulation screen. On this basis, the evaluation method of dimensional visual effects was proposed based on improved grey clustering, and it is the combination of subjective and objective. The fuzzy evaluation was used to improve the method of determining the weights, …

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Research Of Light Weight 3d Models Repository And Key Techologies, Zhou Wen, Jinyuan Jia, Laixiang Wen, Zhao Long Aug 2020

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. …

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Research On 3d Airway Trees Segmentation And Centerline Extraction Algorithm, Yanbo Li, Yu Xiang Aug 2020

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 …

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Research On Simulation System Of 3d Orchid Flower Blossoming Process, Yanhuang Xu, Junfeng Yao, Baorong Yang, Qidi Wang, Yuzhen Sun Aug 2020

Research On Simulation System Of 3d Orchid Flower Blossoming Process, Yanhuang Xu, Junfeng Yao, Baorong Yang, Qidi Wang, Yuzhen Sun

Journal of System Simulation

Abstract: As the national flower of China, orchid has various kinds of types and shapes, and its bloom process has never been simulated before. A model library of orchid organs was established and a transformation algorithm with random-valued parameters was proposed based on the model library of orchid organs by studying botanical knowledge of orchids and taking orchids with different morphological characteristics as research subjects for virtual modeling. Different segmental transformations were respectively performed on each organ of orchids to simulate growth of the organs according to the growth law of orchids. Different examples for simulating different type of orchids …

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Three-Dimensional Virtual Simulation Of Overflow Dam, Guisheng Fang, Hongfa Wang Aug 2020

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 …

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Motion Tracking System By Direct Fusion Of Rgb-D Camera And Micro-Imu Sensors, Zhang Yang, Xu Lin, Guangyi Sun Aug 2020

Motion Tracking System By Direct Fusion Of Rgb-D Camera And Micro-Imu Sensors, Zhang Yang, Xu Lin, Guangyi Sun

Journal of System Simulation

Abstract: Recently, low cost full Body Motion Tracking attracted tremendous attentions in the fields of Computer Vision and Automation. Single depth camera-and inertial-based motion tracking systems rapidly have become two primary options for small-business and individual consuming markets, due to their relatively inexpensive price and comparable performance. However, both depth camera-and inertial-based motion tracking systems have inherent disadvantages which cannot be eliminated theoretically and experimentally. For example, depth camera tracking mostly failed in the presence of occlusion while inertial sensor tracking usually suffered from drift errors. Therefore, a novel multiple-sensor fusion approach which seamlessly combined the data measured from a …

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Title Medical Image Fusion Based On Multi-Scale Coefficient Decomposition Framework, Kaifeng Wen, Bingjian Li Aug 2020

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 …

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Iekf-Swcs Method For Pedestrian Self-Navigation And Location, Zhe Gao, Li Qing, Li Chao, Liu Ning Aug 2020

Iekf-Swcs Method For Pedestrian Self-Navigation And Location, Zhe Gao, Li Qing, Li Chao, Liu Ning

Journal of System Simulation

Abstract: In the process of using wearable inertial measurement unit to realize pedestrian navigation, accumulated drift errors are increasing with pedestrian moving, which has serious effects on the navigation accuracy. To solve this problem, a pedestrian self-navigation and location method was proposed based on improved extended kalman filter (IEKF). An 18 dimensional filter model fused with human motion characteristics was built. Meanwhile, a step wise closed loop smoothing (SWCS) algorithm was designed in IEKF, which could eliminate the sharp correction at some sample points and improve the smoothness of the trajectory. A self-developed IMU sensor was used to make …

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3d Trajectory Tracking Of Px4 Quadrotor Based On Improved Dynamic Inversion, Yueli Hu, Weiping Cai, Wenrong Yang Aug 2020

3d Trajectory Tracking Of Px4 Quadrotor Based On Improved Dynamic Inversion, Yueli Hu, Weiping Cai, Wenrong Yang

Journal of System Simulation

Abstract: An improved dynamic inversion method was proposed for the underactuation and strong coupling in attitude variables of the quadrotors, namely, combining model reference adaptive control (MRAC) with dynamic inversion in the fast variable loop in the system. Through the establishment of dynamic model of the quadrotor and motor model, the control law of the attitude angle and position was deduced. The MATLAB simulation for the scheme was analysed and compared with conventional dynamic inversion, and also simulated in the situation that tracking a given tracjectory with a 10% weight reduction from it's load. Simulation with respect to both …

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Efficiency Simulation Of System Of Uav Patrol System Base On Stk, Yang Yong, Xijun Yan, Zhang Heng Aug 2020

Efficiency Simulation Of System Of Uav Patrol System Base On Stk, Yang Yong, Xijun Yan, Zhang Heng

Journal of System Simulation

Abstract: In order to analyze problems such as coverage percent of mission area and reliable communication between unmanned aerial vehicle (UAV) and ground control station, a method for simulation and validation based on STK was proposed. The condition should be satisfied in theory to achieve seamless coverage of the mission area by using UAV reconnaissance and communication system was analyzed. A method for down link calculation of UAV and the ground control station was proposed. STK simulation was used for validating the correctness of theoretical analysis. It shows that the simulation results can provide rational support for UAV reconnaissance and …

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Task Allocation Modeling For Agent-Oriented Uuv Collaborative System, Hongtao Liang, Fengju Kang Aug 2020

Task Allocation Modeling For Agent-Oriented Uuv Collaborative System, Hongtao Liang, Fengju Kang

Journal of System Simulation

Abstract: Task allocation modeling plays an important role in UUV collaborative system. In order to solve task allocation problem for the collaborative capability and efficiency, the Extended Contract Net Protocol (ECNP) task allocation approach was creatively proposed, which mainly focused on narrow the scope of communication and improving the negotiation efficiency. In this approach, Regional Trust Degree was introduced to narrow the scope in Announcement stage; and the capacity constraints (Energy-state, Health-State, and Detecting-window) were employed to decide whether to participate in bidding stage; also mixed-weighting evaluation strategy based on Game theory was proposed to evaluate the biding in Awarding …

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Research And Application Of Multidisciplinary Optimization Technology Based On Virtual Prototyping, Tao Luan, Junhua Zhou, Baocun Hou Aug 2020

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 …

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Software Design And Implementation For Visualization System Automatic Optimization With Incorporation Of Feedback And Prediction, Xiaodong Wang, Fengju Kang, Gu Hao Aug 2020

Software Design And Implementation For Visualization System Automatic Optimization With Incorporation Of Feedback And Prediction, Xiaodong Wang, Fengju Kang, Gu Hao

Journal of System Simulation

Abstract: To develop high-fidelity and real-time visualization system, the problem of automatic optimization software of visualization system was brought forward. By analyzing the whole development process of visualization system, the attraction method of 3D models significance degree in final rendering image based on bounding box was designed. Combining with the prediction of efficiency of the rendering pipeline, the algorithm with incorporation of feedback and prediction for level of detail (LOD) selection was designed, and the interface and framework of the automatic optimization software were established, which implemented it with C++ programing language. The automatic optimization software implemented above was …

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Algorithm Of Double Level Visual Modeling Based On Data Of Pesticide Residues, Ruijun Liu, Chen Yi, Xu Yang Aug 2020

Algorithm Of Double Level Visual Modeling Based On Data Of Pesticide Residues, Ruijun Liu, Chen Yi, Xu Yang

Journal of System Simulation

Abstract: Based on the study of pesticide residues detection result data, which has the characteristics of geographical level and the level of classification of fruits and vegetables, in node links and radial loop algorithm visualization model, the double level structure, radiation chain graph CircleLink, was designed for analysis of pesticide residues data in visual modeling algorithm. The visual modeling algorithm was applied to the actual pesticide residues detection results data for the simulation analysis and conclusions. Analysis of the characteristics of pesticide collection, distribution of agricultural products and supermarket pesticide residues of pesticide residues was applied.

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Ocean Hydrological Spatio-Temperal Data Visualization Based On Data Awareness, Caixia Li, Song Yuan, Wang Yi, Li Zhi, Xiaolin Cheng Aug 2020

Ocean Hydrological Spatio-Temperal Data Visualization Based On Data Awareness, Caixia Li, Song Yuan, Wang Yi, Li Zhi, Xiaolin Cheng

Journal of System Simulation

Abstract: Spatio-temporal data mining has emerged as an active research field focusing on the modeling and visualization of ocean hydrological data. A model of spatio-temporal data awareness (SDAM) was proposed, which gave details from three parts: 1) Description with data semantic tag for spatio-temporal context and value. 2) Awareness of spatial neighborhood semantic features by means of tri-linear interpolation; Awareness of temporal neighborhood semantic features by means of spatio-temporal frequent pattern mining; Developing database with the spatio-temporal coupling characteristics. 3) Developing feature cluster and application dataset by spatio-temporal clustering. With an application case of China's hydrological database, SDAM visualization on …

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Design And Implementation Of Electromagnetic Spectrum Visualization System, Bin Fang, Ma Jie, Keyu Sun Aug 2020

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 …

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Group Decision Making Model For Weapon Selection Using Extended Vikor Method Under Intuitionistic Fuzzy Environment, Shanliang Yang, Wang Peng, Li Ge, Kedi Huang Aug 2020

Group Decision Making Model For Weapon Selection Using Extended Vikor Method Under Intuitionistic Fuzzy Environment, Shanliang Yang, Wang Peng, Li Ge, Kedi Huang

Journal of System Simulation

Abstract: With respect to weapon system selection problem, in which attribute weights are completely unknown and attribute values are expressed with linguistic information, a multi-attribute group decision-making method based on extended VIKOR was proposed. The intuitionistic fuzzy weighted averaging (IFWA) operator was introduced to aggregate all the individual decision-making information in order to obtain the intuitionistic fuzzy decision matrix. The intuitionistic fuzzy entropy method was utilized to obtain the objective weights of evaluation criteria. The alternative weapon systems were ranked according to the basic concept of extended VIKOR method. A case study of air-to-ground guided missile selection problem for UCAV …

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Application Of Mutil-Level Fuzzy Algorithm In Ir Countermeasure Performance Integrated Evaluation, Li Fan, Geng Xu, Xiaojie Dong, Zehua Hong Aug 2020

Application Of Mutil-Level Fuzzy Algorithm In Ir Countermeasure Performance Integrated Evaluation, Li Fan, Geng Xu, Xiaojie Dong, Zehua Hong

Journal of System Simulation

Abstract: In order to improve the evaluation precision of countermeasure of IR guidance systems, a new method was proposed. The principle of multi-level fuzzy comprehension evaluation was analyzed, and a four level fuzzy comprehension evaluation was established. The result of the example under different simulation conditions shows its effectiveness.

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Research And Simulation Of Cross Flow Heat Exchanger, Chengyun Wu, Guangwen Wang, Geping Li, Xudong Xin Aug 2020

Research And Simulation Of Cross Flow Heat Exchanger, Chengyun Wu, Guangwen Wang, Geping Li, Xudong Xin

Journal of System Simulation

Abstract: Based on cell concept, the lumped parameter method was applied and the parameters in single heat exchanger cell were deduced. Thereafter 1, 4, 9,100 cells heat exchanger simulation model was set up and the simulation error and its influencing factors were analyzed. To simplify the algorithm and increase the calculation speed, as well as improve the accuracy of cross flow heat exchanger, the simplified heat exchanger model was proposed and reviewed. The research results show that the calculation of simplified heat exchanger is precise and the algorithm is simple. The model could be widely applied in cross flow heat …

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Adaptive Traffic Signal Timing Model On Polling System And Simulation Study, Guan Zheng, Yueqiang Wang, Wenhua Qian Aug 2020

Adaptive Traffic Signal Timing Model On Polling System And Simulation Study, Guan Zheng, Yueqiang Wang, Wenhua Qian

Journal of System Simulation

Abstract: A road traffic signal timing system could be corresponds to a polling model. For a queue with a large number of vehicles, under the exhaustive service, the corresponding traffic light will state on green for a long time to empty the queue, vise engender frequent switchover. Motivated by this problem, the timing strategy with minimum and maximum green times for each phase was proposed, which was modeled as a time limited polling system, and then the average queue length at the beginning of green period was analyzed to calculate the green times by the Markova chain and Generation Function …

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Gait Recognition Based-On Relative Motion Features And Kinect, Yang Ke, Dou Yong, Lv Shaohe Aug 2020

Gait Recognition Based-On Relative Motion Features And Kinect, Yang Ke, Dou Yong, Lv Shaohe

Journal of System Simulation

Abstract: Gait recognition Kinect is a very important biometric technology. Gait feature can be divided into two categories: static and dynamic. Some work found that although the essential characteristics of gait are motion, but the motion feature's recognition capability is limited. However, is the distinguishing ability of the motion itself limited, or existing features doesn't adequately capture the characteristics of motion? Relative distance-based motion features were proposed, and distances between the particular skeleton points and their changes were used to characterize the gait. The relative motion features were extracted without calculating the gait cycle, and with robustness. Experimental results …

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Facial Expression Recognition With Independent Subspace Analysis Based Feature Learning, Yongjie Zhan, Long Fei, Yikun Bu Aug 2020

Facial Expression Recognition With Independent Subspace Analysis Based Feature Learning, Yongjie Zhan, Long Fei, Yikun Bu

Journal of System Simulation

Abstract: Hand-designed features (such as Gabor, LBP) has been widely employed in facial expression recognition. In the real-world applications of facial expression recognition, it is very difficult to achieve perfect face alignment because of the impact of complex background and the limitations of face alignment approaches. Independent Subspace Analysis (ISA) is an unsupervised feature learning method, which can be used to learn phase-invariant visual features from images. The problem of facial expression recognition based on ISA in the situation of not precise face alignment was investigated. Through analyzing the facial expression recognition performances with different subspace size, it was turned …

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Parallel Radiosity Based Light Distribution Simulation Within Virtual Plant Canopy, Can Hou, Liyu Tang, Chongcheng Chen, Yifei Yang Aug 2020

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. …

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