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Articles 11011 - 11040 of 25629

Full-Text Articles in Computer Engineering

Micro Modeling And Simulation Of Bi-Directional Pedestrian Flows Crossing Bottleneck, Li Yue, Renyong Guo, Chen Liang, Jingdong Li Jan 2019

Micro Modeling And Simulation Of Bi-Directional Pedestrian Flows Crossing Bottleneck, Li Yue, Renyong Guo, Chen Liang, Jingdong Li

Journal of System Simulation

Abstract: An improved bi-directional pedestrian model based on reciprocal velocity obstacles (RVO) is proposed to investigate self-organization phenomena for bi-directional pedestrian flows crossing bottlenecks, and the influencing factors of pedestrian flow are analyzed. According to the RVO model problem, an improved method is constructed. The model of bi-directional pedestrian flows crossing bottleneck in subways based on Unity 3D is established. Based on this improved model, the bi-directional pedestrian flows crossing bottleneck in subways is simulated. Simulation results indicate that the model can veritably simulate self-organization phenomena for bi-directional pedestrian flows crossing bottlenecks in subways and pedestrians flow is an increasing …

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Variable Sampling Period Scheduling Algorithm Based On Grey Neural Networks With Resource-Constrained System, Weiguo Shi, Wang Li, Shao Cheng Jan 2019

Variable Sampling Period Scheduling Algorithm Based On Grey Neural Networks With Resource-Constrained System, Weiguo Shi, Wang Li, Shao Cheng

Journal of System Simulation

Abstract: Considering networked control system of the limited resources, a kind of variable sampling period scheduling algorithm based on grey-RBF-neural-network prediction network bandwidth is proposed. According to the history and current network bandwidth values of monitoring period, the original time series of different lengths are built, and the grey prediction method is used to get different grey prediction data; the grey prediction data as the input of the RBF neural network are used to realize secondary prediction for network bandwidth, which ensures that prediction data can reflect the actual situation of the network; the absolute error integral parameter is used …

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Group Consensus Of Multi-Agent Networks With Multiple Time Delays, Lianghao Ji, Xinyue Zhao Jan 2019

Group Consensus Of Multi-Agent Networks With Multiple Time Delays, Lianghao Ji, Xinyue Zhao

Journal of System Simulation

Abstract: The group consensus problems for first-order and second-order multi-agent networks with multiple time delays are investigated respectively. Based on the theory of frequency-domain, some algebraic criteria are analytically proposed, which can guarantee the achievement of group consensus. The results show that the input time delays, the coupling weights and the coupling strengths between the agents play key roles in reaching group consensus, whereas communication time delays can only affect the convergence rate of the systems. The validity of the results is verified by several simulated examples.

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Progress Of Quantum Information System And Its Scale Model Test, Miao Qiang, Dewei Wu Jan 2019

Progress Of Quantum Information System And Its Scale Model Test, Miao Qiang, Dewei Wu

Journal of System Simulation

Abstract: In the free-space quantum information technology application fields, such as the quantum communication system, the quantum positioning/navigation system and the quantum radar system, the non-ideal channel environment can cause quantum fading effect to destroy the availability of the whole quantum system. The development of the channel fading experiment of the quantum information transmission system was summarized and analyzed. The scale model experiment idea of the free-space quantum transmission system was put forward: the whole free-space quantum transmission system including the channel environmentwas reduced in size with a big scale factor to establish a scale model system; the operational principle, …

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Decision-Making Simulation Of Farmers’ Safe Production Behavior, Cui Li, Liping Luo Jan 2019

Decision-Making Simulation Of Farmers’ Safe Production Behavior, Cui Li, Liping Luo

Journal of System Simulation

Abstract: Farmers' production behavior is the source of quality and safety of agricultural products,and the primary task to control the quality and safety of agricultural products is to research the factors affecting farmers’ behavior for safe production. We explored the factors influencing farmers’ decision-making for safe production behavior based on the theory of planned behavior and established the model of farmers' decision-making for safe production behavior based on cost-benefit theory. The model which was simulated and analyzed revealed the specific impact on farmers' safe production behavior decision from every influence factor in the quantitative point of view. Results …

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Real-Time Pricing Strategy Considering The Risk Of Smart Grid, Hongbo Zhu, Gao Yan, Yeming Dai Jan 2019

Real-Time Pricing Strategy Considering The Risk Of Smart Grid, Hongbo Zhu, Gao Yan, Yeming Dai

Journal of System Simulation

Abstract: The real-time electricity price mechanism is an ideal method to adjust the power balance between supply and demand in smart grid. Its implementation has profound impacts on the users' behavior and the operation and management of electricity power grid’s safety. The users’ demand behavior plays a regulatory role in designing real-time electricity pricing strategy. Aiming at maximizing social welfare, the dynamic change of users’ aggregate demand is analyzed, which corrects the electricity risk items in online real-time risk model in the way of changing the individual user’s power fluctuations to all the users’ demand power fluctuations, and the optimization …

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Vibration Performance Prediction And Reliability Analysis For Bearings, Xintao Xia, Chang Zhen, Yunfei Li Jan 2019

Vibration Performance Prediction And Reliability Analysis For Bearings, Xintao Xia, Chang Zhen, Yunfei Li

Journal of System Simulation

Abstract: The bearing vibration signal contains a large amount of information involved in degradation of spindle system. The adding-weight one-rank local-region method is used to predict the vibration time series for bearing, and the forecasting error can be obtained by comparing and analyzing the prediction values with the actual values so as to verify the feasibility of the model. The prediction results of the future state for the bearing are processed by grey bootstrap method, and the vibration thresholds are given by the requirements of the spindle system on the bearing vibration performance. The performance reliability prediction of the bearing …

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Modeling And Simulation Of Pid Networked Control Systems Based On Neural Network, Zhanzhi Qiu, Shifeng Li Jan 2019

Modeling And Simulation Of Pid Networked Control Systems Based On Neural Network, Zhanzhi Qiu, Shifeng Li

Journal of System Simulation

Abstract: According to the problems of the delay compensation and PID parameters tuning of networked control systems, a class of rapid PID networked control systems based on improved BP network was proposed. Considering the problems of obtaining hidden layer nodes number and local optimum of the BP network delay prediction model, a calculation method was proposed to obtain hidden layer nodes number, and an improved genetic algorithm was proposed to train the BP network. Considering the problems of integral saturation, parameters tuning and model mismatch of the PID network control systems, a PID parameter adjuster was designed based on …

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L2-Gain Robust Control For Flexible Joints And Flexible Link Space Robot, Lijiao Zhang, Chen Li Jan 2019

L2-Gain Robust Control For Flexible Joints And Flexible Link Space Robot, Lijiao Zhang, Chen Li

Journal of System Simulation

Abstract: The trajectory tracking and the double flexible vibration active suppression control for free-floating space robot with flexible-joints and flexible-link were proposed. The dynamic equation of the system was established according to system’s momentum conservation and Lagrange method. A singular perturbation model was established by integral manifold method, and the system was decomposed into a fast subsystem of flexible-joint which used the speed difference between the feedbacks of control law to suppress the elastic vibration of flexible-joints, a fast subsystemof flexible-link which designed optimal linear quadratic regulator (LQR) to damp out the vibration of the flexible manipulator and …

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Simulation Study On Cutting Force Of Sicp /Al Composite, Jinfeng Wang, Jiulan Zhao, Kaiyu Chu Jan 2019

Simulation Study On Cutting Force Of Sicp /Al Composite, Jinfeng Wang, Jiulan Zhao, Kaiyu Chu

Journal of System Simulation

Abstract: This paper studies the formation mechanism of cutting force of SiCp / Al composite based on the processing parameters from the turning experiment, and explains the effect of cutting parameters on the cutting force of SiCp/Al composite such as cutting speed and cutting depth. To further investigate the influence of cutting parameters on cutting force, this paper conducts cutting force simulation of SiCp/Al composite based on ABAQUS, and verifies the accuracy and feasibility of the simulation by comparing with turning experimental results. The S/N ratio and variance of cutting force are analyzed using Taguchi methods. The results show that …

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Comparative Study Of Photovoltaic Islanding Detection Based On Sms And Afd, Yunjun Yu, Guoying Zhong, Ruixiang Fan, Qingzhao Ji, Jianyong Zhu Jan 2019

Comparative Study Of Photovoltaic Islanding Detection Based On Sms And Afd, Yunjun Yu, Guoying Zhong, Ruixiang Fan, Qingzhao Ji, Jianyong Zhu

Journal of System Simulation

Abstract: There are many islanding detection methods, especially the active islanding detection method. It is difficult to choose the best method among so many active islanding detection methods in practice. In this paper, the non-detection zone (NDZ), detection speed and their effect to power quality of slide-mode frequency shift (SMS) method and active frequency drift (AFD) were researched. The results show that SMS is superior to AFD at the aspect of the effect on power quality when they have same NDZ. While the detection speed of SMS has big difference under different parameters. The Islanding detection model was built …

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Public Opinion Evolution And Intervention From Perspective Of Public’S Social Responsibility, Qinghua Song, Jianhong Chen Jan 2019

Public Opinion Evolution And Intervention From Perspective Of Public’S Social Responsibility, Qinghua Song, Jianhong Chen

Journal of System Simulation

Abstract: According to the theory of planned behavior and stages of information spreading behavior, public opinion evolution mechanisms are analyzed from the perspective of public’s social responsibility (SR). Stability of public opinion evolution system is influenced by four kinds of information spreading bodies. Corresponding information spreading paths interact each other while they are relatively independent, which makes stability of the four paths show complexity features. Publishing positive information timely, decreasing population proportion of group ignoring SR and decreasing population proportion of group lack of SR are effective measures of reducing intensity of public opinion evolution and severity of public opinion …

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Modeling For Security Protection Capability Of Information System Based On Cpn, Qiangjun Chen, Mingqing Zhang, Hongshan Kong, Xiaohu Liu, Lianjie Shao Jan 2019

Modeling For Security Protection Capability Of Information System Based On Cpn, Qiangjun Chen, Mingqing Zhang, Hongshan Kong, Xiaohu Liu, Lianjie Shao

Journal of System Simulation

Abstract: Modeling plays an important role in assessment for security protection capability. Oriented to the features that evaluation has many methods which update quickly, the analysis frame is proposed based on detect, analyse and respond. Aimed at the problems that it is difficult to model the intelligent learning and coordination process for protective device, analysis model is built based on CPN. The colors of message color sets represent the different properties of events. Detect, analysis and respond components which represent different process of security protection capability are defined. Two theorems are proved, and model complexity is analyzed. The usability …

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Research On Performance Validation Of Aircraft Based On Air-Table, Haolong Zhang, Liao Xin, Bin Li, Wenshu Wei, Pei Yin, Junpeng Hui Jan 2019

Research On Performance Validation Of Aircraft Based On Air-Table, Haolong Zhang, Liao Xin, Bin Li, Wenshu Wei, Pei Yin, Junpeng Hui

Journal of System Simulation

Abstract: Aiming at the main issues in performance validation of aircraft, this paper applied air-bearing test technology into the area of performance validation of aircraft, designed and established performance validation system of aircraft based on air-bearing. A kind of theory of space scale model was proposed and the mapping relation between air-bearing space and real space was solved. This research provided a new technical approach for performance validation of aircraft. This system has been successfully applied to a kind of aircraft simulation. The Effectiveness and accuracy are verified.

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Abnormal Event Driven Rescheduling Decision Making In Discrete Manufacturing Workshop, Weixi Ji, Youyong Cai, Chaoyang Zhang, Peng Wei Jan 2019

Abnormal Event Driven Rescheduling Decision Making In Discrete Manufacturing Workshop, Weixi Ji, Youyong Cai, Chaoyang Zhang, Peng Wei

Journal of System Simulation

Abstract: To solve the problem of rescheduling of workshop production process, combined with the present situation of transparent manufacturing process in discrete workshop, a decision method of rescheduling and an event processing in discrete workshop driven by the abnormal events are proposed. In the IOT driven discrete manufacturing workshop environment, the complex event processing technology is applied to analyze and deal with the real-time information on manufacturing processes. On this basis, by defining the driven mechanism, the decision scheme and the performance evaluation index of rescheduling, the decision method of rescheduling in discrete workshop facing the costing is put forward; …

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Modeling And Simulation Of Travelers’ Route Choice Behavior Based On Disequilibrium Theory, Zhongxiang Huang, Jianhui Wu, Aiwu Kuang, Zhang Sheng, Xu Yan Jan 2019

Modeling And Simulation Of Travelers’ Route Choice Behavior Based On Disequilibrium Theory, Zhongxiang Huang, Jianhui Wu, Aiwu Kuang, Zhang Sheng, Xu Yan

Journal of System Simulation

Abstract: Considering the influence of heterogeneous travel on traffic flow distribution, the travelers’ route choice behaviors are classified into three types: price regulation, quantity regulation and price-quantity regulation. Three day-to-day dynamical stochastic assignment models based on the disequilibrium theory are established, and the existence, uniqueness, and stability of the solutions to these models are proved. Through model simulation, it proved that each path flow in these three models can converge to a steady state after a finite travel adjustment, and the day-to-day dynamical stochastic assignment model under price-quantity regulation can simulate the influence of heterogeneous travel behaviors on the distribution …

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Improved Hybrid Devs-Based Equipment Modeling Method, Jianchun Zhang, Yanyang Zeng, Wenpeng Xu, Fengju Kang Jan 2019

Improved Hybrid Devs-Based Equipment Modeling Method, Jianchun Zhang, Yanyang Zeng, Wenpeng Xu, Fengju Kang

Journal of System Simulation

Abstract: Aiming at the shortcoming of model reuse and extensibility in the existing underwater warfare simulations, a hybrid modeling method based on improved hybrid DEVS (IHDEVS) is proposed. By analyzing the characteristics of combat in the underwater warfare, the event driven engagement process is constructed. From the two dimensions of entity function and behavior abstraction, a model classification strategy based on separation of concerns is designed, and a universal entity model framework is built based on the IHDEVS modeling theory, including layers of the interaction architecture, the coupling model and the atomic model. A typical example shows that this …

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Numerical Simulation And Experimental Study On The Rolling Process Of Polar Particles, Yanjun Xiao, Kong Xuan, Wang Zhao, Zonghua Zhang, Yanchun Xiao Jan 2019

Numerical Simulation And Experimental Study On The Rolling Process Of Polar Particles, Yanjun Xiao, Kong Xuan, Wang Zhao, Zonghua Zhang, Yanchun Xiao

Journal of System Simulation

Abstract: The densification process of electrical paste particles during the process of battery pole piece rolling is studied. The mechanism of the pole rolling is analyzed theoretical;the basic parameters of the electric slurry particles in the movement are described; the force equation is established; and the basic conditions for the stable rolling are analyzed. The dynamic simulation is carried out by using relevant parameters, and the results are verified by theoretical analysis, numerical simulation and experimental verification. The results show that there is a certain relationship between the relative density of the electrode paste and the thickness of the …

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Modeling And Research Of Global Allocation Policy In Cascading Failures, Chongjie Dong Jan 2019

Modeling And Research Of Global Allocation Policy In Cascading Failures, Chongjie Dong

Journal of System Simulation

Abstract: In reality, the global loads of network usually alter when the structure and function of network change by a list of attacks. Based on this, the paper defines extra loads of the normal node inversely proportional to the distance of failure node and presents a new indicator named "diffusion step" to failure diffusion process, which uses the global allocation policy instead of neighbor or local feature of node. By simulating scale-free network, small-world network and random network, the average results of network show that the scale-free network has strong ability to resist failures. When the influence of global allocation …

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Co-Matting Of Natural Image Pairs, Wei Yi, Shang Liu, Jiahe Qiu, Guijuan Zhang, Dengming Zhu, Yanfei Shen Jan 2019

Co-Matting Of Natural Image Pairs, Wei Yi, Shang Liu, Jiahe Qiu, Guijuan Zhang, Dengming Zhu, Yanfei Shen

Journal of System Simulation

Abstract: Aiming at dealing with the problem of natural image matting, this study focused on a closed-form solution to image pairs matting. For given two images and their corresponding trimaps, the affinity matrix between the two images is calculated. The matting Laplacian which characters an image to co-matting Laplacian which characters a pair of images is generalized. The alpha mattes of image pairs were obtained by optimizing the energy function which derived from co-matting Laplacian. To validate the approach, the experiments on several datasets are conducted. The results demonstrate that the method can achieve higher quality and is suitable …

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Vital Signs Measurement Based On High-Frequency Linear Frequency-Modulated Continuous Wave, Tianrun Wang, Su Zhong, Liu Ning Jan 2019

Vital Signs Measurement Based On High-Frequency Linear Frequency-Modulated Continuous Wave, Tianrun Wang, Su Zhong, Liu Ning

Journal of System Simulation

Abstract: Aiming at the inherent limitations and inconveniences of the contact and wearable vital signs measurement tools, and low accuracy of the low frequency mmWave, a non-contact vital signs measurement method based on high-frequency frequency-modulated continuous wave (FMCW) is put forward. By mixing the FMCW’s transmitting and receiving waves, the difference frequency signals and its center frequency are obtained. The distance and speed information of the target is derived from the center frequency. By comparing the heart rate test with two hand rings, it is found that the maximum error is 6.7% and the maximum standard deviation is …

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Multi-Frame Fusion Method For Point Cloud Of Lidar Based On Imu, Yanguo Zhang, Li Qing Jan 2019

Multi-Frame Fusion Method For Point Cloud Of Lidar Based On Imu, Yanguo Zhang, Li Qing

Journal of System Simulation

Abstract: Aiming at the problem that in the process of using 16-line laser radar to realize environment perception, the point cloud data is sparse, which leads to the difficulty of target detection and tracking, a new method of LiDAR point cloud fusion based on inertial measurement unit (IMU) is proposed. The method establishes a multi-frame LiDAR point cloud data fusion model, which can effectively use historical point cloud data and detection results to obtain more environmental information, and improve the detection accuracy and tracking ability of target objects. 16-line laser radar and the self-developed IMU sensor are used to conduct …

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Application Of Improved Zupt In Pedestrian Self-Navigation, Tiansheng Wang, Li Qing Jan 2019

Application Of Improved Zupt In Pedestrian Self-Navigation, Tiansheng Wang, Li Qing

Journal of System Simulation

Abstract: In view that the currently traditional Zero Velocity Update (ZUPT) can theoretically correct the cumulative error, while the state error variable of 3-dimensional velocity, position and attitude is measured by the model which is established by the observations of 3D velocity error with poor stability and low precision results, an 18-dimensional zero-velocity update algorithm is proposed. The algorithm uses state information of adjacent time to calculate state observations that cannot be directly observed in the zero-velocity state, and then uses the Kalman filter to optimally estimate all state errors. To verify the accuracy of the improved ZUPT, the experiments …

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Fault Diagnosis Of Rolling Bearing Based On Improved Extreme Learning Machine, Tiantian Wang, Wang Yan, Zhicheng Ji Jan 2019

Fault Diagnosis Of Rolling Bearing Based On Improved Extreme Learning Machine, Tiantian Wang, Wang Yan, Zhicheng Ji

Journal of System Simulation

Abstract: According to the parameter-dependent characteristics of the wavelet kernel extreme learning machine, which make the effect of the rolling bearing fault classifier model poor, a fault classification method based on improved grey wolf optimizer algorithm for optimizing wavelet kernel extreme learning machine was proposed. The method combined the variational mode decomposition and singular value decomposition to extract fault signal characteristics. The opposition-based-learning and the levy flight strategy were introduced to improve the grey wolf optimizer algorithm, which enriched the population diversity of the grey wolf optimizer algorithm, improved the convergence speed of the algorithm and the ability to get …

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Simulation Study Of Ev Sharing Service In Huadu District, Guangzhou, Tingting Li, Jianping Wu Jan 2019

Simulation Study Of Ev Sharing Service In Huadu District, Guangzhou, Tingting Li, Jianping Wu

Journal of System Simulation

Abstract: Electric vehicle (EV) sharing service plays an important role in the construction of the intelligent city, which can reduce the traffic emissions and cut down the ownership of private cars. In order to explore the traffic and environment effectiveness of the car sharing service, this paper builds a microscopic simulation model of EV sharing service. Based on the survey data, a simulation model containing 51 intersections and 107 roads is conducted. Considering 5 different traffic scenes, the paper evaluates the service from various viewpoints. The results demonstrate that there is no distinct influence on the traffic efficiency. However, …

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Simulation Of Wind Power Prediction Based On Improved Elm, Wang Hao, Wang Yan, Zhicheng Ji Jan 2019

Simulation Of Wind Power Prediction Based On Improved Elm, Wang Hao, Wang Yan, Zhicheng Ji

Journal of System Simulation

Abstract: To predict the range of ultra-short-term wind power fluctuation effectively, a combined forecasting model based on fuzzy information granulation (FIG) and genetic algorithm optimization extreme learning machine (GA-ELM) is proposed. The parameters of wind power are granulated by fuzzy information, and the corresponding valid information including the maximal value, the minimum value, and the general average value in time series window is further extracted. By integrating the effective components of each parameter as training samples, the GA-ELM-based prediction model is established. The range of wind power fluctuation in next time series is forecasted through using the optimized model. The …

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Adaptive Backstepping Sliding Mode Control For Straight Line Track Of Unmanned Transport Ship, Mingcong Li, Guo Chen, Yuan Yi Jan 2019

Adaptive Backstepping Sliding Mode Control For Straight Line Track Of Unmanned Transport Ship, Mingcong Li, Guo Chen, Yuan Yi

Journal of System Simulation

Abstract: With the development of unmanned ship technology, the intelligent control of ships is gradually used on large unmanned transport ships. In the course of navigation, ships are often disturbed by various nonlinear factors. Based on Norbbin nonlinear ship motion model, and adopting Lyapunov stability theorem to guarantee the stability of the closed-loop control system, a new sliding mode control method is proposed. Combined with backstepping, a backstepping sliding mode control method is designed to control the line track of ship on condition that the bound of disturbance is known. If the bound of disturbance is unknown, an adaptive …

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Target Tracking Simulation For Unmarked Augmented Reality System Based On Kcf, Zhili Zhang, Wang Chao, Long Yong, Shaodi Wang Jan 2019

Target Tracking Simulation For Unmarked Augmented Reality System Based On Kcf, Zhili Zhang, Wang Chao, Long Yong, Shaodi Wang

Journal of System Simulation

Abstract: An AR system based on the kernelized correlation filter (KCF) target tracking is designed for solving the problem of the insufficiency of tracking in the unmarked augmented reality (AR). The KCF is used to identify and track the targets. The relevant parameters of the camera position are imported. The openGL graphical program interface is called to load the precast object onto the target. The KCF simulation experiment is carried out to track the target with visual studio. The results show that the AR application system based on KCF method can effectively improve the real-time performance of target tracking, and …

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Forward Algorithm Of Lwd Azimuthal Gamma, Qifeng Sun, Youxiang Duan, Yanan Yan, Hongqiang Li Jan 2019

Forward Algorithm Of Lwd Azimuthal Gamma, Qifeng Sun, Youxiang Duan, Yanan Yan, Hongqiang Li

Journal of System Simulation

Abstract: The study of the LWD (Logging While Drilling) azimuthal gamma imaging mode under different geological structures can provide bases for fast and accurate identification of drilled formation. The detection model of LWD azimuthal gamma is set up, and physical models of several positions of the formation and gamma detector is established, combining the descartes coordinate with the spherical coordinate, an azimuthal gamma log response algorithm under different position models is derived. Comparing the simulated results with the measured results of the azimuthal gamma ray logging tool, it is proved that the algorithm can effectively simulate the response characteristics of …

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Reviews Of Project Organization Simulation Modeling Method Based On Computational Organization Theory, Jiwei Zhu, Li’Nan Zhou, Zhai Zhao Jan 2019

Reviews Of Project Organization Simulation Modeling Method Based On Computational Organization Theory, Jiwei Zhu, Li’Nan Zhou, Zhai Zhao

Journal of System Simulation

Abstract: Modeling simulation on project organization combines qualitative individual behavior, organizational behavior and task process, which effectively solves the backlog of tasks, rework and other issues caused by the organizational complexity. The modeling method based on the computational organization theory is divided into organization simulation modeling based on system dynamics, organization simulation modeling based on Agent and organization social network modeling based on SNA. The system dynamics simulates the business process from the perspective of macro organization system. The Agent organization model is able to emerge macro behaviors of organization though simulation of micro behaviors. The SNA method focuses on …

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