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Full-Text Articles in Entire DC Network
Vehicle Detection Method In Uav Aerial Video, Suqin Wang, Wenhao Shi, Zhaoxin Li, Tianlu Mao
Vehicle Detection Method In Uav Aerial Video, Suqin Wang, Wenhao Shi, Zhaoxin Li, Tianlu Mao
Journal of System Simulation
Abstract: The use of UAV aerial photography to obtain traffic information has many advantages like a flexible high mobility, comprehensive information and so on, which plays a vital role in the emergency response, anti-terrorism/battlefield and other environments. This paper proposes a method for vehicle detection in UAV aerial video. Aiming at the problem of UAV video image deflection, the image registration method based on SURF algorithm is used to correct the deflection of UAV hatching video according to the standard frame. The background and the moving vehicle are separated by the pixel-based adaptive segmentation algorithm to detect the moving …
Video Action Recognition Based On Key-Frame, Mingxiao Li, Qichuan Geng, Mo Hong, Wu Wei, Zhou Zhong
Video Action Recognition Based On Key-Frame, Mingxiao Li, Qichuan Geng, Mo Hong, Wu Wei, Zhou Zhong
Journal of System Simulation
Abstract: Video action recognition is an important part of intelligent video analysis. In recent years, deep learning methods, especially the two-stream convolutional neural network achieved the state-of-the-art performance. However, most methods simply use uniform sampling to get frames, which may cause the loss of information in sampling interval. We propose a segmentation method and a key-frame extraction method for video action recognition, and combine them with a multi-temporal-scale two-stream network. Our framework achieves a 94.2% accuracy at UCF101 split1, which is the same as the state-of-the-art method’s performance.
Person Retrieval Method Based On Image Caption, Yadong Li, Mo Hong, Shihao Wang, Zhou Zhong, Wu Wei
Person Retrieval Method Based On Image Caption, Yadong Li, Mo Hong, Shihao Wang, Zhou Zhong, Wu Wei
Journal of System Simulation
Abstract: Retrieve specific person in the surveillance scene is an important and urgent demand on the security field. In recent years, the method of image retrieval is mainly based on image content, which requires the image to be retrieved works as input and thus can’t meet the actual needs of surveillance and security. We propose a method of person retrieval based on image caption and present a new surveillance dataset SPCD which tags person caption. We verify the method in new dataset, the accuracy of gender, dress color and action respectively reaches 86.5%, 93.5% and 65.5%. This paper provides an …
Simulation Optimization Design Method Of Model Driven Aviation Command And Support System, Yongliang Luo, Zhihui Zhang, Zhang Jun, Yuanhui Qin
Simulation Optimization Design Method Of Model Driven Aviation Command And Support System, Yongliang Luo, Zhihui Zhang, Zhang Jun, Yuanhui Qin
Journal of System Simulation
Abstract: As a typical complex system, the design process of air command and security system (ACSS) is different from the existing design process of complex system because of more typical characteristics, such as functional complexity, process complexity and scene complexity. According to the design requirements of ACSS, a simulation optimization design method of model driven and process centered ACSS based on the theoretical method of system engineering is proposed, and the key enabling technologies are introduced, which include model-driven multi-view architecture design, process traction simulation of ACSS, efficient resource optimization and allocation technology, and so on. The simulation and …
Multidisciplinary Coupling Simulation System For Multi-Body Separation Process Of Near Space Vehicles, Tie Ming, Fang Hong, Yu Ying, Caihui Yu, Wang Ling, Dongfei Hu
Multidisciplinary Coupling Simulation System For Multi-Body Separation Process Of Near Space Vehicles, Tie Ming, Fang Hong, Yu Ying, Caihui Yu, Wang Ling, Dongfei Hu
Journal of System Simulation
Abstract: The simulation of coupling dynamics from multi-body movement, flow field and structural stress field plays a significant role in the separation system design for a near space vehicle. In this paper, an elastic-body based multidisciplinary and multi-physics coupling simulation approach is proposed for the vehicle separation process. A multidisciplinary separation simulation system is developed, where the dynamic finite element simulation method for stress field, the high performance numerical simulation method for flow field and the multi-body movement simulation are combined. The proposed simulation system provides an efficient and accurate way to verify the separation scheme and the …
Simulation Assessment Of Degradation System Reliability Under Imperfect Maintenance, Haidong Du, Junhai Cao, Shen Ying, Shangru Teng
Simulation Assessment Of Degradation System Reliability Under Imperfect Maintenance, Haidong Du, Junhai Cao, Shen Ying, Shangru Teng
Journal of System Simulation
Abstract: For the state change characteristic of degradation system under imperfect maintenance, the common analysis method becomes useless. A simulation method for repairable system is presented. A change rule of system reliability was analyzed and a reliability assessment model was built on the foundation of components degradation process. A simulation tactics based on variable structure modeling was given which is realized through Agent technique. A maintenance optimization example was given for the determination of maintenance opportunity which is used to support the formulation and improvement of maintenance support program for repairable system.
Construction And Utilization Of Simulation Meta-Model Based On Influence Diagram Game, Zhong Lin, Mingan Tong, Li Sheng
Construction And Utilization Of Simulation Meta-Model Based On Influence Diagram Game, Zhong Lin, Mingan Tong, Li Sheng
Journal of System Simulation
Abstract: To overcome the shortcomings of the meta-model, the dynamic influence diagram game is used as simulation meta-model. A construction process and the utilization for structured dynamic influence diagram game (DIDG) are presented. The necessary simulation data are gathered for the construction of a DIDG that presents the changes in simulation state with chance nodes. The decision alternatives and objectives of the decision problem are included in the DIDG as decision and utility nodes. The adversary’s action is represented by an explicit decision node in which case an influence diagram game results. The constructed DIDG is solved to …
Modeling And Simulation Of Airport Flight Flow Based On Cellular Automaton, Hongying Zhang, Xuwei Yang, Luo Qian
Modeling And Simulation Of Airport Flight Flow Based On Cellular Automaton, Hongying Zhang, Xuwei Yang, Luo Qian
Journal of System Simulation
Abstract: To increase the reliability of the airport scene traffic simulation model, the complex characteristics of scene traffic are researched. An improved model based on NS model is proposed. The influence of the stochastic factors on the taxiing process and the traffic characteristics at the intersection are considered, and the new cells are added to connect the two sections with different evolution rules. The state of the connected cells represents the occupancy of the next section. A large number of simulation experiments were processed, and the results show the goodness of fit between the simulation values and true ones increased …
Multi-Strategy Cooperative Evolutionary Pso Based On Cauchy Mutation Strategy, Yongji Wang, Tingting Su, Liu Lei
Multi-Strategy Cooperative Evolutionary Pso Based On Cauchy Mutation Strategy, Yongji Wang, Tingting Su, Liu Lei
Journal of System Simulation
Abstract: For improving the performance of particle swarm optimization (PSO) in optimization simulation, a multi-strategy cooperative evolutionary PSO based on Cauchy mutation strategy is proposed. The new algorithm divides the whole swarm into three sub-swarms. A part of particles is selected to Cauchy mutation with a certain probability, and the rest of particles adjust their exploitation and exploration by different evolutionary strategies (large-scale search strategy, local search strategy, and adaptive velocity updating strategy). The sub-swarms share their information to achieve cooperation. Three strategies are used to optimize three test functions, and the result shows the advantages …
Method Of Visualsimulation Of Rice Leaf Color, Hongyun Yang, Aizhen Sun, Wenji Yang, Huojiao He
Method Of Visualsimulation Of Rice Leaf Color, Hongyun Yang, Aizhen Sun, Wenji Yang, Huojiao He
Journal of System Simulation
Abstract: A color rendering method for rice leaves based on SPAD data distribution image was presented. Rice leaf image was collected and SPAD value was measured by field rice sample test. The relationship model between SPAD values and RGB value of leaf image was analyzed and constructed, and the R2 was 0.932 8, 0.833 1, 0.562 3 respectively. This showed that there was a correlation between SPAD and the red and green color of the leaf image. By the SPAD data distribution image, the spatial distribution of SPAD value on the leaf surface is described. The leaf surface color …
Message Passing Algorithm Through Particles On Factor Graph In Cooperative Positioning Network, Xinyue Fan, Wang Guan, Zhou Fei
Message Passing Algorithm Through Particles On Factor Graph In Cooperative Positioning Network, Xinyue Fan, Wang Guan, Zhou Fei
Journal of System Simulation
Abstract: Combining the sum-product algorithm with the factor graph can achieve cooperative positioning by a distributed manner. The sum-product algorithm is a message passing algorithm. However, the parameter method cannot meet the positioning needs because of the large error in the non-linear non-Gaussian environment. Therefore, this paper presents an algorithm to achieve message passing in the form of particle. The calculation of the message in the factor consists of summation and quadrature processes. The proposed method obtains the sum of messages by importance sampling, obtains the product of messages using Gibbs sampling. Particle-based information passing algorithm can simplify the complex …
Cell-Devs Social Interaction Modeling And Simulation For Emergency Evacuation Systems, Yanhong Wang, Wang Xia, Shaowei Wang
Cell-Devs Social Interaction Modeling And Simulation For Emergency Evacuation Systems, Yanhong Wang, Wang Xia, Shaowei Wang
Journal of System Simulation
Abstract: This paper aims to present a Cell-DEVS model for emergency evacuation systems, which behave uncertainty and are intricately driven by the social factors. The model introduces social interaction factors such as familiarity degrees, individual vision, communication and conduction, and velocity zones as the state variables, describing the relationship between the evacuees and environment, as well as the interactions with each other. The algorithm optimization enhances reality of simulation. The RESTful CD++ is applied as middleware to execute remote simulation. The results confirm the existence of social interaction. This work benefits to the architecture design, evacuation planning and …
Adaptive Feedback Elitist Teaching-Learning-Based Optimization Algorithm, Rongyu Li, Liang Dong, Guihong Qi
Adaptive Feedback Elitist Teaching-Learning-Based Optimization Algorithm, Rongyu Li, Liang Dong, Guihong Qi
Journal of System Simulation
Abstract: Elitist teaching-learning-based optimization (ETLBO) is a novel optimization algorithm based on the practical teaching-learning process of the class. An adaptive feedback elitist teaching-learning-based optimization (AFETLBO) algorithm is proposed to solve the problem of low precision and poor stability of the ETLBO. At the end of the learner phase, student can be divided into the top students and the inferior students dynamically by adding the adaptive feedback phase. In this phase, the inferior students should communicate with the teacher and enable themselves to be close to the teacher quickly so as to strengthen the convergence ability. The top students should …
Trajectory Planning And Interactive Simulation Software Design For Flight Vehicle With Specified Terminal Time, Mingwei Sun, Shunjian Ma, Zengqiang Chen, Chaofang Hu
Trajectory Planning And Interactive Simulation Software Design For Flight Vehicle With Specified Terminal Time, Mingwei Sun, Shunjian Ma, Zengqiang Chen, Chaofang Hu
Journal of System Simulation
Abstract: Specified terminal time is a special requirement in some path planning problems. It is difficult to solve in real time with specified time, angle and multiple no-fly zones considered. A practical path model is utilized, and a nonlinear optimization problem with respect to waypoints is reformulated. The requirements on time, angle and obstacle avoidance for original path planning problem are converted into constraints of the proposed optimization after geometrical relationships are identified. The optimization problem is established and met the form of sequential quadratic programming problem which is solved by SNOPT (Sparse Nonlinear OPTimizer) package. A computer-aid interactive simulation …
Coalescence Characteristics Of Droplets Containing Surfactants On Topographic Substrates, Xuemin Ye, Yuxi Lin, Lifang Lu, Chunxi Li
Coalescence Characteristics Of Droplets Containing Surfactants On Topographic Substrates, Xuemin Ye, Yuxi Lin, Lifang Lu, Chunxi Li
Journal of System Simulation
Abstract: The droplet motion evolution model was established based on the lubrication theory for two identical surfactant-containing droplets on the topographic substrate. The coalescing process of the droplets on topographic substrate was simulated, and the effects of spacing, wave number and base height on the characteristics of coalescing were examined. The results show that the two droplets meet and superimpose each other under the capillary force, and finally form a “new” droplet at tf. The dynamics of droplet over time are divided into five stages; while the surfactant concentration experiences the three stages in a short period; …
Image Classification Based On Sparse Autoencoder And Support Vector Machine, Liu Fang, Lixia Lu, Hongjuan Wang, Wang Xin
Image Classification Based On Sparse Autoencoder And Support Vector Machine, Liu Fang, Lixia Lu, Hongjuan Wang, Wang Xin
Journal of System Simulation
Abstract: A new algorithm of image classification based on the sparse autoencoder and the support vector machine was proposed in view of the drawbacks that the single layer sparse autoencoder for feature learning is easy to lose the deep abstract feature and the features lack the robustness. The deep sparse autoencoder is constructed to learn each image layer and the feature of each layer is automatically extracted. The each feature weights and the reorganized set of feature are obtained according to the feature weighting method. By combining the strong global search ability of genetic algorithm and the excellent performance of …
Broadband 2-D Doa Estimation Based On Continuous Sparse Recovery, Chenxi Wu, Zhang Min, Keren Wang
Broadband 2-D Doa Estimation Based On Continuous Sparse Recovery, Chenxi Wu, Zhang Min, Keren Wang
Journal of System Simulation
Abstract: For the problem of two dimensional underdetermined direction of arrival (2-D DOA) estimation, three parallel sparse arrays are designed and a novel DOA method based on continuous sparse recovery is proposed. The dimension of received data is reduced and the cross covariance matrix is vectorized to improve freedom degree. According to the objection function of the minimization issue based on total variation norm constraint, the space frequency is achieved by solving corresponding dual problem. The center frequency, azimuth and pitch angles are paired by capon method. Theoretical analysis shows the proposed method has a higher array aperture extension and …
Inputting Strategy Simulation Of Multi-Ramp Coordinated Control Signal For Urban Expressway, Mingbao Pang, Zemin Xia, Yanhai Luan
Inputting Strategy Simulation Of Multi-Ramp Coordinated Control Signal For Urban Expressway, Mingbao Pang, Zemin Xia, Yanhai Luan
Journal of System Simulation
Abstract: Based on the analysis of the driver's reaction when the urban expressway is in traffic jamming state and stated preference survey (SP) investigating, the key parameters' variation trends when the driving behavior adjusts and the possible path changing probability for a driver in each state are determined. A cellular automaton model of coordinated control section on urban expressway is established, where the driving behaviors are described accurately. The characteristics of traffic flow is discussed via the simulation experiments after inputting coordination control signals with different on-ramp numbers upstream of jamming point. The effects of each coordinated control modes on …
Open Circuit Fault Diagnosis Strategy For Switch Of Three Level Inverter, Yanxia Shen, Beibei Miao
Open Circuit Fault Diagnosis Strategy For Switch Of Three Level Inverter, Yanxia Shen, Beibei Miao
Journal of System Simulation
Abstract: Fault diagnosis of switch is the premise of reliable operation of three-level-inverter under the fault of the switch. Taking simple open circuit fault of the diode neutral point clamped (NPC) three level inverter as an example, the open circuit fault diagnosis method based on the combination of online and offline diagnoses is proposed. The fault phase is detected by the mean value of the bridge arm phase voltages. In the time domain, the fault switch tube is diagnosed by the maximum and minimum values of the load phase voltages. In the frequency domain, the amplitude of the fault signal …
Gams-Based Active Power Optimization With Reactive Power Compensation, Weiqing Sun, Ye Lei, Yiyun Tu
Gams-Based Active Power Optimization With Reactive Power Compensation, Weiqing Sun, Ye Lei, Yiyun Tu
Journal of System Simulation
Abstract: Based on the safe operation of the electric system, aiming at the problems of large power loss and high generation cost, it is unreasonable to schedule electricity through only one index, so a combined model of economic dispatch with reactive power optimization and a linearized model of unit commitment are proposed. The ideal point method changes multi-objective optimization problem which is combined with the generation cost and power loss into a single objective optimization problem and solved by GAMS. The case analysis for IEEE-39 bus system and a regional transmission network, by adjusting the generator active and reactive power …
Stability Analysis Of Post-Fault Power Angle Based On Relevance Vector Machine, Haiying Li, Zhuocheng Xue
Stability Analysis Of Post-Fault Power Angle Based On Relevance Vector Machine, Haiying Li, Zhuocheng Xue
Journal of System Simulation
Abstract: Energy interconnection has become a hot topic in the current research.With the large-scale of new energy into the grid, the safe operation of power system is facing new challenges. On line fast stability analysis is one of the effective ways to solve this problem. Traditional power system transient safety analysis method is difficult to adapt to the on-line analysis, and the further development of large data processing and machine learning provides a new way of thinking. The classification model of relevance vector machine (RVM) based on Bayesian framework is used to design a kind of power angle classification strategy. …
Simulation And Analysis Of Atmospheric Effects On Height Deriving From Insar, Xintian Wang, Guowang Jin, Xiong Xin, Hongmin Zhang, Xu Qing
Simulation And Analysis Of Atmospheric Effects On Height Deriving From Insar, Xintian Wang, Guowang Jin, Xiong Xin, Hongmin Zhang, Xu Qing
Journal of System Simulation
Abstract: The atmospheric phase delay caused by tropospheric water vapor (WV) is an important factor to the precision of repeat-pass mode interferometry synthetic aperture radar (InSAR). To study the WV effect quantitatively, the regulation of WV effect in repeat-pass InSAR is analyzed and the simulation scheme is designed in which the DEM and WV model is used to simulate InSAR interferogram and WV delay phase, and the derived height is analyzed. The experiment is performed by using systems and baseline parameters of SAR images of Henan;WV effected interferogram is simulated using DEM and vertical layered WV model; and the derived …
Trust Model And Simulation Of E-Commerce Based On Social Networks, Yu Zhen, Zhu Jie, Guicheng Shen
Trust Model And Simulation Of E-Commerce Based On Social Networks, Yu Zhen, Zhu Jie, Guicheng Shen
Journal of System Simulation
Abstract: In the current e-commerce industry, users need to check for the historical evaluation of the commodity before buying goods mostly, but false recommendations and massive redundancy recommendation problem which widely exists at present seriously affect the effectiveness and accuracy of users’ obtaining recommendations. For getting trust in e-commerce transactions, an e-commerce trust model SNTrust based on social networks is proposed. In SNTrust model, each user maintains a trusted social network set; a topological structure of the user information diffusion in the social network is described in the model, and the recommendation node trust is introduced to measure its credibility, …
Quadrotor Attitude Control Based On An Improved Adrc, Wang Biao, Chaoying Tang, Daqing Kong
Quadrotor Attitude Control Based On An Improved Adrc, Wang Biao, Chaoying Tang, Daqing Kong
Journal of System Simulation
Abstract: An improved attitude control scheme for the quadrotor is proposed based on active disturbance rejection control (ADRC). The attitude dynamics of the quadrotor is modelled and analysed. The influence of actuator characteristics is discussed to establish an extended state observer (ESO). Based on it, the ESO is compensated by the delay unit and its discrete state equations are given. Nonlinear function of previous studies is used to construct nonlinear state error feedback (NLSEF). The simulation results show that the ESO with compensation of the delay unit gets better estimation of disturbance and compensates to disturbance better than the ESO …
Research On Concession Period Performance Of Highway Ppp Project Based On Pavement Maintenance, Zhang Hong, Rongbei Zheng, Wenshan Qiao
Research On Concession Period Performance Of Highway Ppp Project Based On Pavement Maintenance, Zhang Hong, Rongbei Zheng, Wenshan Qiao
Journal of System Simulation
Abstract: There are long-term dynamic and interactive relationships among highway pavement performance, user satisfaction, maintenance costs and profits, government satisfaction and related decisions in the life cycle pavement maintenance. Based on analyses of dynamic impacts and complexity of stakeholders’ behaviors around the highway pavement maintenance, a system dynamics (SD) model of the concession period performance for the highway public-private-partnership (PPP) project is established. Based on simulation experimental analysis of an example, validation and application of the proposed SD model are illustrated. Through sensitivity analysis, the influences of different stakeholders such as government, private investors, and users on the concession …
Current Sensor Fault Diagnosis For Induction Motor In Vector Control System, Sun Kai, Baina He, Sarah Odofin, Gu Yu
Current Sensor Fault Diagnosis For Induction Motor In Vector Control System, Sun Kai, Baina He, Sarah Odofin, Gu Yu
Journal of System Simulation
Abstract: A current sensor fault diagnosis method of induction motor in vector control system is proposed. A state-space form including sensor faults and environmental disturbances/noises of induction machine is described. An augmented observer is designed to simultaneously estimate system states, and current sensor faults. To attenuate the effects from the environmental disturbances/noises, a genetic algorithm is employed to design observer gain by minimizing the estimation error against environmental disturbances and noises. A simulation model based on Matlab and real-data of the induction motor collected by experiment is utilized to validate the proposed methods, which show the efficiency of the proposed …
Simulation On Anti-Swing Of Container Cranes Based On Iterative Learning Control, Liang Gang, Yiming Zhao, Hengming Qin
Simulation On Anti-Swing Of Container Cranes Based On Iterative Learning Control, Liang Gang, Yiming Zhao, Hengming Qin
Journal of System Simulation
Abstract: To achieve the purpose of reducing or even eliminating the fixed stop container’s swinging after container cranes positioning, thereby improving the efficiency of quayside container cranes, the PD-type iterative learning control is selected to perform simulation analysis. This selection is based on the analysis of dynamic properties of quayside container lifting systems and the qualities of the repetitive nature of the swing phase of the container. A fixed initial state is assumed, and the PD parameters are determined after several debugging tasks. Based on Simulink blocks, the entire iterative learning controller model is established to design lifting systems of …
Simulation And Experimental Verification Of Grinding Force Based On Different Directions Of Ultrasonic Vibration, Wang Yan, Qin Chen, Jianguo Liu, Shuiping Peng, Delin Li
Simulation And Experimental Verification Of Grinding Force Based On Different Directions Of Ultrasonic Vibration, Wang Yan, Qin Chen, Jianguo Liu, Shuiping Peng, Delin Li
Journal of System Simulation
Abstract: The method based on variable angle of ultrasonic vibration assisted grinding was put forward to identify the relationship between direction of ultrasonic vibration and grinding force. The trajectory of grit in contact zone was analyzed. The stress field of contact zone and the grinding force, which were based on the different directions of ultrasonic vibration, were simulated and analyzed by Deform-3D. A series of grinding experiments of GCr15 were conducted. It demonstrates that with the angle α increasing, the grinding force firstly decreased and then increased. The experiment results showed that the error of normal force is 5.23% and …
Block-Based Evolutionary Algorithm For Permutation Flow-Shop Scheduling Problem, Xiaobing Pei, Zhao Heng
Block-Based Evolutionary Algorithm For Permutation Flow-Shop Scheduling Problem, Xiaobing Pei, Zhao Heng
Journal of System Simulation
Abstract: To solve the permutation flow-shop scheduling problem(PFSP), an effective new global evolutionary algorithm based on block model is developed. The probability model is built based on the information of job position through sample and statistic on the good chromosomes, and the association rule is applied to extract continuous or discontinuous blocks which contain job information respectively. The superiority blocks with position probability model for artificial chromosome combinations are integrated. The disadvantage gene is excavated according to the inferior chromosome and used for the later mutation operation. Two efficient local search methods called position model-based interchange and NEH-based insertion are …
Modeling And Realization Of Acoustic Signal Separation Simulation System Based On Systemvue, Xiaorong Tong
Modeling And Realization Of Acoustic Signal Separation Simulation System Based On Systemvue, Xiaorong Tong
Journal of System Simulation
Abstract: Aiming at the practical requirements of blind separation process of acoustic signals, a modeling method of acoustic signals separation simulation system based on SystemVue simulation platform is proposed according to specific mode of signal separation and acoustic sensor network layout in the practical work. It provides a novel signal separation algorithm based on signal single source detection which is the improvement of FastICA algorithm. It also can obtain the source acoustic signals without the information of signal source numbers. The SystemVue software is used to model the net of acoustic sensors, and the target simulation information is generated at …