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2020

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Articles 811 - 840 of 2675

Full-Text Articles in Computer Engineering

Discussion Of Integrating Biological-Chemical Hazard Simulation And Artificial Society Computational Experimental Platform, Sihang Qiu, Xiaogang Qiu, Bin Chen Aug 2020

Discussion Of Integrating Biological-Chemical Hazard Simulation And Artificial Society Computational Experimental Platform, Sihang Qiu, Xiaogang Qiu, Bin Chen

Journal of System Simulation

Abstract: Biological-chemical hazard once brought great loss to human beings, which encouraged people to develop a number of biological-chemical simulation models and corresponding simulation tools. However, influences of hazards to society were rarely considered in the past. By integrating biological-chemical simulation and artificial society computational experimental platform, it was feasible to assess hazard and analyze its social effects meanwhile, which efficiently assisted manager to estimate hazard risk and make decisions. Two methodologies of integration and a corresponding example were given.

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Soft Sensor Of Concentration Of Sodium Aluminate Solution Based On Reduction Robust Lssvm, Rongling Sun, Xiaoshan Qian Aug 2020

Soft Sensor Of Concentration Of Sodium Aluminate Solution Based On Reduction Robust Lssvm, Rongling Sun, Xiaoshan Qian

Journal of System Simulation

Abstract: Taking into account of poor stability, radioactive, higher maintenance costs and lack of manual detection of serious lag issues for online testing instrument of sodium aluminate concentration, combined with the mechanism analysis of the evaporation process, selecting parameters that affect the concentration of sodium aluminate solution as the auxiliary variables, using weighted loss function of the least squares support vector machine (Least Squares Support Vector Machine, LSSVM), a robust soft measuring for the concentration of sodium aluminate solution was achieved. Schmidt method was used to simplify the matrix and reduce the computational complexity. Industrial process data simulation results show …

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Integrated Modeling Method Of Flight Director And Guarantee Process, Yongliang Luo, Zhang Jun, Yuanhui Qin, Han Sheng, Yuanming Wang Aug 2020

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.

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Active-Combine-Passive Homing Trajectory Simulation And Accuracy Analysis For Anti-Torpedo Torpedo, Congshan Xiao, Huizhen Yang Aug 2020

Active-Combine-Passive Homing Trajectory Simulation And Accuracy Analysis For Anti-Torpedo Torpedo, Congshan Xiao, Huizhen Yang

Journal of System Simulation

Abstract: An active-combine-passive homing model was established based on mathematics model of relative motion and automatically-adjust-lead-angle method. A simulation method of working process was designed about the active-combine-passive homing and simulates the trajectory. The influence on the guidance accuracy caused by homing range, sector angle and active-homing cycle was analyzed by using Monte Carlo method. Simulation result indicates that active-combine-passive homing owns a high level effect of interception, the guidance accuracy can be effectively improved by increasing homing range and homing sector angle and decreasing the active-homing cycle.

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Study On Key Techniques About Refueling Simulation In Air, Hongtu Li, Guan Wei, Jijiang Song, Guangxing Zhao, Zewei Ma Aug 2020

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.

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Research And Application Of Improved Cmms Descriptive Method, Shengjie Wang, Fengju Kang, Han Hong Aug 2020

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 …

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Modeling Analysis And Visualization Simulation For Leveled Stage Of Loitering Munition, Zengyan Li, Xiaomin Li Aug 2020

Modeling Analysis And Visualization Simulation For Leveled Stage Of Loitering Munition, Zengyan Li, Xiaomin Li

Journal of System Simulation

Abstract: Loitering munition can be launched by various platforms. However, due to the impact of the delivery platform, the initial launching status of the missile-borne aircraft is uncertain. The leveled stage of missile-borne aircraft is different from other traditional flight modes. For this particular process, the dynamic model in leveled stage was established. Reliable aerodynamic parameters were obtained by Fluent's simulation method. Based on Simulink, the flight simulation module and control strategy in leveled stage were designed. Simulink-FlightGear method was used to display the real-time flight state. Through the simulation, flight characteristics in leveled stage are achieved, such as, motion …

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Modeling And Simulation Of Mooring System In Anchor Handling Simulator, Zhongxian Zhu, Yin Yong, Helong Shen Aug 2020

Modeling And Simulation Of Mooring System In Anchor Handling Simulator, Zhongxian Zhu, Yin Yong, Helong Shen

Journal of System Simulation

Abstract: Dynamics modeling and simulation of the mooring system are the key technologies in Anchor Handling Simulator (AHS), the model's quality and the visualization have great impact on the real-time, fidelity and immersed feeling in the scene simulation, and hence affect the quality of training on the anchor handling operation by using AHS. Based on the Lumped Mass Method the dynamics model of the mooring line was built up, and 4-order Runge-Kutta method was used to solve the model, and the computing speed could meet the demand on real-time; A model for the mooring line embedded in seabed soil was …

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A Research Of Virtual Human Assembly Intelligent Simulation Technology, Yunfei Yang, Gu Yan, Xiumin Fan, Qichang He, Shiguang Qiu Aug 2020

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 …

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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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Vector Field Topology Analysis And Application In Visualization, Li Chao, Lingda Wu, Bin Zhao Aug 2020

Vector Field Topology Analysis And Application In Visualization, Li Chao, Lingda Wu, Bin Zhao

Journal of System Simulation

Abstract: Vector field topology analysis is an important tool of feature-based visualization of vector fields. As a frontier research of flow field visualization, topology analysis extracts the topological structures as vector fields' features, helps uses filter important data, and reduce the occlusion and visual cluster. Based on mathematical definitions related to vector field topology analysis, different methods were introduced along with their advantages and shortcomings, and a knowledge system of vector field topology analysis was well-established. The applications and significance of topology analysis were explored to play a greater role, and the combination with other visualization techniques was discussed …

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Dark Color Image Segmentation Method Integrated Mrf & Retinex, Yongchun Miao, Cheng Yan Aug 2020

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 …

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Pedestrian Dynamic Aggregation Simulation Model With Emotional Affection, Xiang Nan, Lingyun Zhu, Mingmin Zhang Aug 2020

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 …

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Human Action Recognition Method Based On Key Frames, Xiangbin Shi, Shuanpeng Liu, Deyuan Zhang Aug 2020

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, …

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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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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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Optimize Visual Hull With Concave Based On Depth Map, Guojun Chen, Wei Xin Aug 2020

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 …

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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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Constructing Panoramic High Dynamic Range Image Based On Different Amounts Of Exposures, Quan Wei, Wang Ying, Yanchun Wang, Xuyang Wang, Yunrui Zhu Aug 2020

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 …

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Real-Time Visualization Method For Processing Data Stream, Hongqian Chen, Li Hui, Fang Yi, Chen Yi, Beibei Zhou Aug 2020

Real-Time Visualization Method For Processing Data Stream, Hongqian Chen, Li Hui, Fang Yi, Chen Yi, Beibei Zhou

Journal of System Simulation

Abstract: To visualize the status data of the procedure in real time, a visualization method supporting by the relating static model was proposed. The static models were built in the method. The processing status data were divided into some data segment matching to the static model. The dynamic model for each data segment was built based on the shape of the corresponding static model. Each part of the model was colorized or texturized based on its type or value. All the dynamic model and static model were linked and assembled due to its logical relation. The final visualization result …

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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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3d Model Retrieval Based On Hand-Drawn Sketches, Dianhui Mao, Huanpu Yin, Haisheng Li, Cai Qiang Aug 2020

3d Model Retrieval Based On Hand-Drawn Sketches, Dianhui Mao, Huanpu Yin, Haisheng Li, Cai Qiang

Journal of System Simulation

Abstract: Currently, retrieve 3d models use hand-drawn sketch as query has become an active research field. In the Bag of Feature (BoF) framework, the granularity of the distinction and expression brought by the "hard clustering" is insufficient. To solve this problem, a new method was proposed: GALIF feature was extracted from each sketch and the set of view images of models. BOF was replaced by a feature coding based on “soft clustering”--Gaussian mixture model. A fast and effective manifold ranking algorithm was used to calculate the manifold similarity between images, giving the final retrieve results. The previous methods …

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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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Application Of Wavelet Packet Improved Reconstruction Algorithm To Energy Measurement Of Non-Linear Loads, Hualong Cai, Kun Xiao Aug 2020

Application Of Wavelet Packet Improved Reconstruction Algorithm To Energy Measurement Of Non-Linear Loads, Hualong Cai, Kun Xiao

Journal of System Simulation

Abstract: In order to realize high-accuracy measurement of nonlinear loads, an improved algorithm of harmonic energy measurement based on discrete wavelet packet decomposition and reconstruction was proposed. Frequency band and the corresponding number of decomposition layer were given according to the sampling number, window width and sampling frequency. To improve the non-ideal cut-off characteristic of wavelet filter and eliminate the frequency aliasing, the discrete Fourier and the inverse transformation were used to remove the extra frequency components. The calculation expression of harmonic power and the principle of harmonic energy measurement were listed. The simulation analysis of harmonic energy measurement …

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Dynamic Simulation Of Single Abrasive Grain Cutting Tc4 Based On Sph Method, Wang Yan, Wang Shuai, Jianguo Liu, Xiong Wei Aug 2020

Dynamic Simulation Of Single Abrasive Grain Cutting Tc4 Based On Sph Method, Wang Yan, Wang Shuai, Jianguo Liu, Xiong Wei

Journal of System Simulation

Abstract: Considering the negative effects of mesh distortion on calculation accuracy in FEM simulation, a novel mesh free method named Smoothed Particle Hydrodynamics (SPH) method was employed to simulate the process of single CBN abrasive grain cutting TC4. Establishing a SPH model of TC4 workpiece and a FEM model of single abrasive grain with cutting edges similar to the real abrasive grain, the influences of cutting depth on grinding forces and chip formative process were studied systematically. The simulation results state that grinding forces enlarge with the increase of cutting depth, while grinding force ratio decreases. And TC4 chip formative …

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Communication Model Modeling Method In Warfare Modeling And Simulation, Yuanfeng Li, Jianping Liu, Chengying Shi Aug 2020

Communication Model Modeling Method In Warfare Modeling And Simulation, Yuanfeng Li, Jianping Liu, Chengying Shi

Journal of System Simulation

Abstract: The limitation of the traditional communication model modeling methods was analyzed. On the basis of detailed analysis the requirements of communication modeling and simulation, the method of communication model modeling method was designed based on the communication effects. It shows how to represent communication asset and combines the input and output of the model with the simulation verification scenario to illustrate the validity and applicability of the communication model. This method can effectively solve the impact analysis of communication problem for operational effectiveness, saves development costs and supplies the reference method of C4ISR model in warfare modeling …

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Formation Cooperation Of Computer Generated Forces Organization, Shaobin Sun, Shinan Zhang, Dong Bo Aug 2020

Formation Cooperation Of Computer Generated Forces Organization, Shaobin Sun, Shinan Zhang, Dong Bo

Journal of System Simulation

Abstract: Cooperation is the base of Computer Generated Forces team behaviors; formation and formation changing are the mostly used team cooperation of tank unit CGF. By combining cooperation planning with joint intention, a formation cooperation method for tank unit CGF was promoted. According to the knowledge levels of different CGF roles about the cooperation, the commander role CGF planed conditions and restraints of the formation cooperation, and the subordinated CGF autonomy planed to concretely implement the cooperation, which significantly enhanced the formation cooperation efficiency. The joint intention was established before the implementation of the cooperation, all CGF revised cooperation action …

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