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4,223 full-text articles. Page 117 of 209.

Dark Color Image Segmentation Method Integrated Mrf & Retinex, Yongchun Miao, Cheng Yan 2020 School of Computer Information Engineering, Jiangxi Normal University, Nanchang 330022, China;

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 2020 College of Mathematic and Information Science, Shandong Institute of Business and Technology, Yantai 264005, China;

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 2020 1. College of Information Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China;;3. Shenzhen Institutes of Advanced Technology, Shenzhen 518055, China;;

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 2020 1. Department of Computer, Shenyang Aerospace University, Shenyang 110136, China;;2. Liaoning General Aviation Key Laboratory, Shenyang Aerospace University, Shenyang 110136, China;;3. College of Information, Liaoning University, Shenyang 110036, China;

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, …


Research On Simulation System Of 3d Orchid Flower Blossoming Process, Yanhuang Xu, Junfeng Yao, Baorong Yang, Qidi Wang, Yuzhen Sun 2020 1. Zhangzhou City College, Zhangzhou 363000, China;;

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 …


Development Of A Virtual Reality System For Space Planning Simulation, Wenbo Yang, Yinhao Song, Zhao Xin 2020 1. Institute of Robotics and Automatic Information System, Nankai University, Tianjin Key Laboratory of Intelligent Robotics, Tianjin 300071, China;;

Development Of A Virtual Reality System For Space Planning Simulation, Wenbo Yang, Yinhao Song, Zhao Xin

Journal of System Simulation

Abstract: A virtual reality platform for space simulation was developed to simplify the implementation of weapon and based design. First, the architecture of the simulation system was described briefly; Second, based on the characteristics of space simulation platform, several key modules were introduced, including terrain real-time generation, analysis of space layout, and closest distance calculation. The terrain generation for space simulation platform was based on database management. The closest distance calculation was based on nearest neighbor k-d tree searching. In addition, a three-dimensional (3-D) model library, containing vehicles, test equipment, plant facilities, and other tools, was established for dynamic loading …


Motion Tracking System By Direct Fusion Of Rgb-D Camera And Micro-Imu Sensors, Zhang Yang, Xu Lin, Guangyi Sun 2020 Tianjin Key Laboratory of Intelligent Robotics, Institute of Robotics and Automatic Information System, Nankai University, Tianjin 300071, China;

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 …


Soft Shadow Map Method For Exploration Scene Simulation Of Lunar Rover, Yang Cheng, Jianliang Zhou, Geshi Tang, Li Xie, Guangming Chen, Shushi Liu 2020 1. Key Lab of National Defense on Aerospace Flight Dynamics Technology, Beijing 100094, China;;2. Beijing Aerospace Control Center, Beijing 100094, China;

Soft Shadow Map Method For Exploration Scene Simulation Of Lunar Rover, Yang Cheng, Jianliang Zhou, Geshi Tang, Li Xie, Guangming Chen, Shushi Liu

Journal of System Simulation

Abstract: Scene simulation technology has gained a vast range of application in many different fields, such as aerospace measurement and controlling, by displaying the mission process and flight status in 3D real-time graphics interactively, which provided a comprehensive and intuitive controlling platform. The lunar exploration has been implemented with unmanned lunar rovers to detect the environments of the moon. Tele-operation was adopted to control the whole process by making and sending detecting plan and programming to the rover, in which the position of the sun was the key constraint condition. An effective real-time soft shadow map algorithm was presented to …


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

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 …


Discussion Of Integrating Biological-Chemical Hazard Simulation And Artificial Society Computational Experimental Platform, Sihang Qiu, Xiaogang Qiu, Bin Chen 2020 National University of Defense Technology, Changsha 410073, China;

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.


Active-Combine-Passive Homing Trajectory Simulation And Accuracy Analysis For Anti-Torpedo Torpedo, Congshan Xiao, Huizhen Yang 2020 1. College of Marine Engineering, Northwestern Ploytechnical University, Xi'an 710072, China;;;2. Underwater Information and Control Laboratory, Xi'an 710072, China;

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.


Group Decision Making Model For Weapon Selection Using Extended Vikor Method Under Intuitionistic Fuzzy Environment, Shanliang Yang, Wang Peng, Li Ge, Kedi Huang 2020 College of Information System and Management, National University of Defense Technology, Changsha 410073, China;

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 …


Research On Attitude Controller Based On Modified Adaptive Robust Sliding Mode In Low-Flying, Yunjie Wu, Chuang Song, Jingxing Zuo 2020 1. State Key Laboratory of Virtual Reality Technology and System, Beihang University, Beijing 100191, China;;2. School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191 , China;;3. Science and Technology on Aircraft Control Laboratory, Beihang University, Beijing 100191, China;

Research On Attitude Controller Based On Modified Adaptive Robust Sliding Mode In Low-Flying, Yunjie Wu, Chuang Song, Jingxing Zuo

Journal of System Simulation

Abstract: Regarding inertia uncertainties, external disturbances and severe nonlinear coupling factors among the three channels including pitching, yawing and rolling at low-flying, controller design of wide adaptability could quickly and precisely realize the spacecraft attitude tracking control in a limited time. Based on the nonlinear model of the aircraft attitude, a kind of modified controllers was designed based on a robust adaptive sliding mode controller in the finite time convergence among three channels, the controller is continuous and differentiable. The adaptive controller was improved to stop a large controller output. Simulation results show that the designed attitude controller can …


Control System Design Based On Integral Sliding Mode Of Quadrotor, Zengqiang Chen, Chenlu Wang, Li Yi, Zhang Qing, Mingwei Sun 2020 1. Key Lab of Intelligent Robotics, College of Computer and Control Engineering, Nankai University, Tianjin 300071, China;;2. College of Science, Civil Aviation University of China, Tianjin 300300, China;

Control System Design Based On Integral Sliding Mode Of Quadrotor, Zengqiang Chen, Chenlu Wang, Li Yi, Zhang Qing, Mingwei Sun

Journal of System Simulation

Abstract: A double closed-loop control system based on integral sliding mode was proposed to solve the problems of position and attitude control of an under-actuated, nonlinear coupling quadrotor model. An integral sliding mode control method was applied in the inner loop attitude control and a PID controller was designed in the outer loop position control. Due to the under-actuated property of the quadrotor model, desired pitch and roll angles were given by outer loop controller. The stability of the designed control system was proved by Lyapunov stability theorem. Simulation results on Matlab show the effectiveness of the proposed control system …


Process Model Of Complex R & D Project Based On Design Structure Matrix, Baosen Yang, Kejun Zheng, Lai Ling 2020 Tianjin University of Commerce, Tianjin 300134, China;

Process Model Of Complex R & D Project Based On Design Structure Matrix, Baosen Yang, Kejun Zheng, Lai Ling

Journal of System Simulation

Abstract: Since complex product R&D project is characteristic with more stochastic factors, a process model was established for complex product R&D project. The model made a comprehensive description of complex information dependencies between activities, timing between the upstream and downstream, feedback iterative relationship, parallel overlapping relationship, constraints and process parameters (time parameters, cost parameters, rework probability, rework impact, learning curve, etc.) by multi-view approach. Some case studies were proposed in detail to illustrate the modeling process. This provides new ways and means of the simulation for the complex product R&D project risk analysis.


Soft Sensor Of Concentration Of Sodium Aluminate Solution Based On Reduction Robust Lssvm, Rongling Sun, Xiaoshan Qian 2020 1. Physical Science and Technology College, Yichun University, Yichun 336000, China;;

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 …


Modeling And Simulation Of Mooring System In Anchor Handling Simulator, Zhongxian Zhu, Yin Yong, Helong Shen 2020 Navigation College, Dalian Maritime University, Dalian 116026, China;

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 …


Vector Field Topology Analysis And Application In Visualization, Li Chao, Lingda Wu, Bin Zhao 2020 1. Equipment Academy, Beijing 101416, China;;

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 …


Color Transfer Based On K-Means Clustering Algorithm And Region Matching, Ziying Zhang, Mingquan Zhou, Wuyang Shui, Zhongke Wu, Zheng Xia 2020 1. College of Information Science and Technology, Beijing Normal University, Beijing 100875, China;;2. Engineering Research Center of Virtual Reality and Applications, Ministry of Education, Beijing 100875, China;;

Color Transfer Based On K-Means Clustering Algorithm And Region Matching, Ziying Zhang, Mingquan Zhou, Wuyang Shui, Zhongke Wu, Zheng Xia

Journal of System Simulation

Abstract: For color transfer between colorful images, we used K-means clustering to classify image pixels and we also proposed nearest region matching algorithm. This algorithm can avoid the problem that multiple regions matched to the same region, and it can get the best match results between the two images. Translate the color space from RGB to for the two images. Divide color image and luminance mapped shape image using K-means models into the same number of classes. Determine the relationship between regions of the two images using Euclidean distance and the nearest region matching algorithm. Complete color transfer from color …


Application Of Mutil-Level Fuzzy Algorithm In Ir Countermeasure Performance Integrated Evaluation, Li Fan, Geng Xu, Xiaojie Dong, Zehua Hong 2020 Shanghai Institute of Electro-Mechanical Engineering, Shanghai 201109, China;

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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