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Articles 58261 - 58290 of 198000

Full-Text Articles in Engineering

Research On Network-On-Chip Synthesis Flow Based On Hybrid Optimization Mapping Algorithm, Junyi Li, Yijun Liu, Le Jianliang Jun 2020

Research On Network-On-Chip Synthesis Flow Based On Hybrid Optimization Mapping Algorithm, Junyi Li, Yijun Liu, Le Jianliang

Journal of System Simulation

Abstract: To solve the problem of particle swarm optimization algorithm, which is easy to fall into local optimum in network on chip mapping, a hybrid optimization mapping Algorithm based on particle swarm optimization and genetic algorithm was proposed. It implemented GA and PSO separately with two groups, by the superior individuals from GA algorithm instead of the initial random particles from PSO algorithm, which not only maintained the diversity of the group but also improved search efficiency. Simulation results based on NS-2 show that the Network-on-Chip from the automatic generation tools have a good performance in network latency, throughput, and …

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Estimation Of Atmospheric Parameter Based On Airflow Velocity Over Wing Leading Edge, Lilin Qian, Jianwu Tao, Yueming Yang, Yu Fei Jun 2020

Estimation Of Atmospheric Parameter Based On Airflow Velocity Over Wing Leading Edge, Lilin Qian, Jianwu Tao, Yueming Yang, Yu Fei

Journal of System Simulation

Abstract: A new method measuring the atmospheric parameters was proposed based on acoustic vector sensors located at the wing leading edge, and the atmospheric parameters model was set up based on the airflow velocity distribution sensed by acoustic vector sensor over wing leading edge. According to the symmetric, swept character of wings, velocity vector was decomposed to solve the non-linear equation of model. The expressions of angle of sideslip, angle of attack and free stream velocity were derived. The feasibility of the expressions was verified by wing simulation data from Fluent.

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Online Optimal Control Method Of Conveyor-Serviced Batch Processing System, Wu Song, Tang Hao, Tan Qi Jun 2020

Online Optimal Control Method Of Conveyor-Serviced Batch Processing System, Wu Song, Tang Hao, Tan Qi

Journal of System Simulation

Abstract: In conveyor-serviced batch processing system, jobs arrive dynamically and are stored in a buffer to be further processed by the batch processing machine. Under the cases of non-identical job sizes, online optimal control of the system with a single machine was mainly concerned. Optimization model of the system was built by using look-ahead range as control variable. The objective is to maximize the job processing rate of the system in infinite horizon. Two decision processes are included in the model, which are batching process and action-selection process. For the batching process, the rule of minimizing process-capacity wasting ratio of …

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Co-Design Between New Event-Triggered Communication Scheme And Less Conservative Robust H∞ Fault-Tolerant Control For Networked Control Systems, Li Wei, Pengfei Zhai, Yajie Li Jun 2020

Co-Design Between New Event-Triggered Communication Scheme And Less Conservative Robust H∞ Fault-Tolerant Control For Networked Control Systems, Li Wei, Pengfei Zhai, Yajie Li

Journal of System Simulation

Abstract: Based on the analysis for the disadvantage of the current discrete event-triggered communication schemes, a new kind of event-triggered communication scheme constrained by transient and stead-state process was proposed to perfect the conservatism and isolation of the fault-tolerant controller. A closed-loop failure model which was concerned with state-error was established for networked control system. Using the improved Wirtinger's inequality and the improved reciprocally convex combination inequality, the co-design between new event-triggered communication scheme and less conservative robust H∞ fault-tolerant control for networked control systems was focused on. The simulation results show that the new discrete event-triggered …

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Simulation Of Ultrasonic Shear Wave Imaging In Detection Of Liver Rupture, Yu Jiao, Erwei Nie, Yanying Zhu Jun 2020

Simulation Of Ultrasonic Shear Wave Imaging In Detection Of Liver Rupture, Yu Jiao, Erwei Nie, Yanying Zhu

Journal of System Simulation

Abstract: Ultrasonic shear wave imaging technology provides the elastic information of the soft tissue by examining the propagation of the shear waves in the tissue. The possibility of using ultrasonic shear wave imaging technology combined with a directional filter for the detection of liver rupture was explored. The COMSOL Multiphysics software was used to simulate the generation and propagation of the shear waves in the liver medium with a rupture, a directional filter-based algorithm was applied to separate the incident wave and reflected wave, and an edge detection algorithm was applied to detect and delineate the liver rupture. Preliminary results …

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Evaluation Method Research For Coal Mine Services Policy, Xue Xiao, Bin Gui, Yongmao Wang Jun 2020

Evaluation Method Research For Coal Mine Services Policy, Xue Xiao, Bin Gui, Yongmao Wang

Journal of System Simulation

Abstract: Mine service is the integration of the package which is based on a number of existing information system, the operation effect of service strategy directly determines the overall performance of the service system. However, due to the complexity of coal mine accidents and the special of mine environment, testing and evaluation of service strategy is very difficult in the actual environment. In order to solve this problem, an integrated evaluation method of coal mine service policy was proposed based on computational experiment. This method could be divided into three steps: the adaptive service strategy of service system in the …

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Modeling Approach For Predictive Maintenance Scheduling Model Based On Variable Conversion, Mingyi You Jun 2020

Modeling Approach For Predictive Maintenance Scheduling Model Based On Variable Conversion, Mingyi You

Journal of System Simulation

Abstract: A modeling approach for predictive maintenance (PdM) scheduling model based on decision variable conversion was proposed. Based on the proposed approach, a PdM scheduling model could be established by replacing the time decision variable in the corresponding classical time-based preventive maintenance (PM) scheduling model with product condition variable(s) and checking the correlation of the model parameters, maintenance effect and maintenance constraints with product condition. Based on the proposed modeling approach, the application case study considered an unreported predictive maintenance model in which system benefit was correlated with its condition. The proposed approach used the existing PM scheduling …

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Model For Multi-Area Interaction Control Based On User Strategy, Gong Bi, Bin Yu Jun 2020

Model For Multi-Area Interaction Control Based On User Strategy, Gong Bi, Bin Yu

Journal of System Simulation

Abstract: To solve the problem of multi-area interaction, a model based on user strategy was established. The structure of model was proposed according to security area and user strategy, and transfer path and relevant concept were put forward. The model was instantiated based on portable storage device, the multi-area interaction scene was set up, and the interaction controller structure was designed. Experiments were set up to simulate the host read/write memory process. By judging the host's read/write jurisdiction to memory partition and whether the transfer path can be arrived, the experimental results show that the model can realize interaction control …

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Closed-Loop Feedback Simulation To Process Of Ram Blowout Preventer Shut-In Locking, Fangzhou Zhang, Ruixue Sun, Wenjing Zhang, Li Long, Li Qiang Jun 2020

Closed-Loop Feedback Simulation To Process Of Ram Blowout Preventer Shut-In Locking, Fangzhou Zhang, Ruixue Sun, Wenjing Zhang, Li Long, Li Qiang

Journal of System Simulation

Abstract: Well control training was explained mainly by teacher in recent years. Virtual simulation made it difficult for students to understand the actual operation. Application of drilling well control simulation training system solved effectively the problem of the scene seldom repetition and high cost of well control training. For the simulation of the process of ram blowout preventer shut-in locking in the well controlled physical simulation training system, the stepping motor driver and the stepping motor were installed in ram blowout preventer, and locking operation of the lock device was realized by using speed and torque of the stepping motor …

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Direct Torque Control For Brushless Dc Motor With Optimal Voltage Space Vector, Xianzhong Jian, Shuangjie Qian Jun 2020

Direct Torque Control For Brushless Dc Motor With Optimal Voltage Space Vector, Xianzhong Jian, Shuangjie Qian

Journal of System Simulation

Abstract: The current freewheeling phenomenon and its causation of torque ripple were analysed. With the relationship between rotor and coil position, the traditional selection rules of voltage space vector were modified. To effectively control the freewheeling current, two different voltage space vector under the three-phase conduction model was proposed, making current keep close to the ideal curve and inhibit torque ripple. For speed adjustment, the Pang-Pang control was carried out after flow stage. The simulation model was carried out under the Simulink environment. The simulation results show that the proposed voltage space vector can effectively adjust the freewheeling …

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Risk Simulation Analysis Of Runway Incursions Based On Multi Agents, Baojun Huang, Xiaodan Fang, Jiening Wang Jun 2020

Risk Simulation Analysis Of Runway Incursions Based On Multi Agents, Baojun Huang, Xiaodan Fang, Jiening Wang

Journal of System Simulation

Abstract: Nowadays, runway incursions are important problems affecting flight safety in airport surface operation. According to this problem, a new method was proposed for the risk analysis of runway incursion by using multi agent modeling theory, which established a risk analysis agent model of runway incursion. Pointing at typical scenarios for runway incursion incidents, LEADSTO (Language and Environment for Analysis of Dynamics by SimulaTiOn) language was applied to realize the accident simulation by temporal logic. Simulation results show that specification for pilot or controller behavior and alertness can avoid accidents occurrence. The proposed method can simulate dynamic system, which has …

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Numerical Simulation On Hydraulic Characteristics Of Free Hydraulic Jump On Corrugated Beds Of Stilling Basin, Wenli Wei, Yunfei Hong, Yuling Liu Jun 2020

Numerical Simulation On Hydraulic Characteristics Of Free Hydraulic Jump On Corrugated Beds Of Stilling Basin, Wenli Wei, Yunfei Hong, Yuling Liu

Journal of System Simulation

Abstract: The VOF (volume of fluid) method was applied to track the free water surface, and the RNG k–ε turbulent model was used to close the two-phase flow time-averaged equations. The conditions properties of free hydraulic jumps on corrugated beds with a stilling basin under 9 kinds of conditions were studied by numerical simulation. Simulation research results show: There are vortexes generated by corrugated beds surfaces, rotating in the clockwise direction. The pressure distribution on corrugated beds in hydraulic jump region appears a wavy change, and the difference between the pressure values at adjacent crest and trough gradually decreases along …

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Research And Simulation Of Satellite Channel Three-State Markov Model Under Fog-And-Haze Weather, Yecai Guo, Lijian Cai, Weijuan Zhao, Xiuzai Zhang Jun 2020

Research And Simulation Of Satellite Channel Three-State Markov Model Under Fog-And-Haze Weather, Yecai Guo, Lijian Cai, Weijuan Zhao, Xiuzai Zhang

Journal of System Simulation

Abstract: To accurately reflect the influence on the statistical characteristics of satellite channel under the fog-and-haze weather, the fog-and-haze weather was divided into the fog state, mixed state, and haze state, respectively, and their statistical characteristics were described by Rice model, Corazza model, and Suzuki model. Based on analyzing the conversion relation between fog-and-haze weather states, the satellite channel three-state Markov model was proposed. The defined joint level pass rate, the average fading duration and its relative error were used as the performance index of the satellite channel model, and the simulation tests were carried out. The simulation results show …

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Drawing Of Isocandela Diagram In Dynamic Detection Of Light Intensity Of Airport Flight Aid Light, Lishan Jia, Liwen Wang Jun 2020

Drawing Of Isocandela Diagram In Dynamic Detection Of Light Intensity Of Airport Flight Aid Light, Lishan Jia, Liwen Wang

Journal of System Simulation

Abstract: To the drawing of isocandela diagram in dynamic detection of light intensity of airport flight aid light, the method of using Regular Rectangle Grid Algorithm was promoted. According to the theory of dynamic detection of light intensity of airport flight aid light, detection data was handled. The method combined virtual grid system with drawing area grid system. Changing trajectory of isocandela curves were searched in the virtual grid system. After searching, they were mapped onto the drawing area grid system and filled, and the isocandela diagram was generated eventually. Drawing program of isocandela diagram was written, simulation experiments were …

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Precisely And Efficiently Vector Data Rendering Method In 3d Gis, Shanglin Li, Hu Xia, Xiaoping Liu Jun 2020

Precisely And Efficiently Vector Data Rendering Method In 3d Gis, Shanglin Li, Hu Xia, Xiaoping Liu

Journal of System Simulation

Abstract: In the geographic information system (GIS), vector data has many important applications in such aspects as orientation space location and spatial analysis. It is essential to make 2D vector data overlay mapping to the 3d terrain accurately and efficiently in 3D GIS. A method based on dynamic vector texture pyramid was proposed to render vector data. The real-time generated vector texture block corresponding with the level of the pyramid according to the current view position. Vector data texture block and terrain block are one-to-one correspondence, then they are unified rendering. Unconstrained anisotropic texture filtering methods was used to reduce …

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Multi-Agent Based Modelling And Simulation For Understanding Tempo-Spatial Patterns Of Surgery Wait Times, Tao Li, Luo Liang, Zili Zhang, Lai Hong, Fuyuan Xiao Jun 2020

Multi-Agent Based Modelling And Simulation For Understanding Tempo-Spatial Patterns Of Surgery Wait Times, Tao Li, Luo Liang, Zili Zhang, Lai Hong, Fuyuan Xiao

Journal of System Simulation

Abstract: In order to characterize the self-organized tempo-spatial patterns of wait times in a healthcare service system, a multi-agent cardiac surgery service model (MA-CSS model) was proposed based on the multi-agent modeling within the context of cardiac surgery services. This model pays a special attention to how patients' and hospitals' behaviors and interactions affect the dynamics and relevant patterns of wait times with respect to some key factors, such as geographic accessibility to services, hospital resourcefulness, and wait times. By experimenting with the MA-CSS model, it was observed that certain regularities in wait times emerged from the simulation, which were …

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Application Of Chirp Signal In Underwater Acoustic Supervision System For Illegal Throwing Sand Behavior Detection, Zhangting Zhong, Yuan Fei, Jiale Wang, En Cheng Jun 2020

Application Of Chirp Signal In Underwater Acoustic Supervision System For Illegal Throwing Sand Behavior Detection, Zhangting Zhong, Yuan Fei, Jiale Wang, En Cheng

Journal of System Simulation

Abstract: To find an efficient and convenient method to determine whether a dredging is illegal is a very meaningful research content. A method of detection of throwing sand behavior based on Chirp signal was studied and three implementation schemes (subsection FFT fast correlation), FRFT and DeChirp were designed. The feasibility of the three schemes was verified by Wu Yuan Bay experiment and the simulation results. Anti-multipath and anti-noise performance of FRFT transform is the best. The performance of dechirp is the worst. Through the analysis, it comes out the conclusion: when the multipath effect is serious, FRFT algorithm …

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Improved Svdd For Speech Recognition And Simulation, Hao Rui, Xiaofeng Liu, Yanbo Niu, Xiu Lei Jun 2020

Improved Svdd For Speech Recognition And Simulation, Hao Rui, Xiaofeng Liu, Yanbo Niu, Xiu Lei

Journal of System Simulation

Abstract: Support vector data description (SVDD) defines multi-class data by their respective hyper-spheres. The computational complexity of the quadratic programming problem is reduced significantly and it is easier to solve multi-class classification problems. Thus, SVDD has attracted more and more attention in the field of speech recognition research. For the problems of the feature vectors of speech samples overlapping and updating, the conventional SVDD for multi-class classification was improved. On the one hand, the spatial position of the samples was fully used to construct the decision function in overlapping domain of hyper-spheres; On the other hand, based on class incremental …

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Hierarchical Agglomerative Community Detection Algorithm Based On Similarity Modularity, Wenwei Zhan, Jingke Xi, Zhixiao Wang Jun 2020

Hierarchical Agglomerative Community Detection Algorithm Based On Similarity Modularity, Wenwei Zhan, Jingke Xi, Zhixiao Wang

Journal of System Simulation

Abstract: Fast Unfolding is a hierarchical community detection algorithm based on modularity. It runs very fast, but the accuracy needs to be improved. Because the algorithm adopts traditional modularity to merger communities, it only considers node link information and ignores the neighbor nodes. Therefore, two nodes that have common neighbors and weak link information may not be merged, thus affecting the accuracy. In view of the shortcomings, a hierarchical agglomerative community detection algorithm based on similarity modularity was proposed through introducing optimized similarity to improve the modularity. It adopts NMI as the accuracy measurement. Experiments on the real network …

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Simulation Research On The Multipath Effect Of Bds Geo/Igso Satellite Navigation Signals, Yachuan Bao, Baoguo Yu, Mingfeng Qin, Luo Yi Jun 2020

Simulation Research On The Multipath Effect Of Bds Geo/Igso Satellite Navigation Signals, Yachuan Bao, Baoguo Yu, Mingfeng Qin, Luo Yi

Journal of System Simulation

Abstract: Pseudo range measure error oscillation phenomenon was discovered in BDS GEO/IGSO satellites monitoring. Research on the phenomenon was made with multipath signal generation and multipath effect theory. The dynamic multipath effect of satellites including GEO, IGSO and MEO were simulated based on the construction of dynamic model of satellites and multipath mirror reflection model. Theory analysis and simulation were made on the pseudo range and carrier phase measure error caused by different dynamic multipath effect. The simulation result is similar with the measure result of practical observation, which gives a new reference for the final revelation of the reason …

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Telemetry Parameters Simulation Of Spacecraft Based On Computation Tree, Ti Zhou, Miao Yi Jun 2020

Telemetry Parameters Simulation Of Spacecraft Based On Computation Tree, Ti Zhou, Miao Yi

Journal of System Simulation

Abstract: Simulation system of spacecrafts' Telemetry and Command (TT&C) needs to simulate lots of telemetry parameters in every missions, whose computing algorithms are different. In the past applications, these algorithms are fixed as codes in software programs, so it is very difficult to improve the maintainability and reuse of the simulation system. By studying the computing methods of telemetry parameters described in configuration files, a design scheme was given in which the algorithms of parameters were flexibly configured, and the principle of methods were described specially in computing parameters, software models, data structure and algorithms. In this framework, the algorithms …

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Efficient Resource Search Mechanism In Selfish Mobile Peer-To-Peer Network, Liu Hao, Xuelong Zhang Jun 2020

Efficient Resource Search Mechanism In Selfish Mobile Peer-To-Peer Network, Liu Hao, Xuelong Zhang

Journal of System Simulation

Abstract: Because of the influence of node's own state and other factors, the node in mobile P2P network often shows the selfishness and resource preference, which greatly affects the resource search efficiency of the network system. Aiming at this problem, a novel resource search mechanism was proposed based cooperation degree of nodes in selfish mobile Peer-to-Peer network. In the search mechanism, through the comprehensive evaluation of the node's information forwarding rate, the overall similarity and the core degree, the node with the highest degree of cooperation was selected as the relay node for information forwarding. At the same time, through …

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Lidar-Based Relative Position And Attitude Filtering For Unknown Targets, Song Liang, Li Zhi, Xingrui Ma Jun 2020

Lidar-Based Relative Position And Attitude Filtering For Unknown Targets, Song Liang, Li Zhi, Xingrui Ma

Journal of System Simulation

Abstract: A LIDAR-Based Extended Kalman Filter (EKF) for relative position and attitude estimation of unknowns target was proposed. The relative position and attitude between the target and a servicing spacecraft was solved by the Iterative Closet Point (ICP) using LIDAR point cloud data, which served as the EKF's measurement input. The system states of EKF include the relative attitude, angular velocity, inertia ratios, relative position, relative velocity, and the position/attitude of target measurement reference frame with respect to target principle frame. The proposed filter estimated the relative position and attitude as well as the unknown parameters of the target. …

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Coverage Path Planning Algorithm Based On Centroidal Power Diagram, Liping Zheng, Yajun Cheng, Lu Chang, Ting Liao Jun 2020

Coverage Path Planning Algorithm Based On Centroidal Power Diagram, Liping Zheng, Yajun Cheng, Lu Chang, Ting Liao

Journal of System Simulation

Abstract: Coverage path-planning algorithm is widely used in mobile sensor networks, multi-robot system, and other fields. The coverage path planning algorithm based on CCCPD(Centroidal Capacity Constrained Power Diagram) was studied. The classical Lloyd based generating method for Centroidal Power Diagram was extended to PD-Lloyd algorithm, which could be used for path-planning. Two optimizing strategies were proposed to enhance the credibility of the PD-Lloyd algorithm by considering the physical moving characteristics of individuals in the real scene. Experiments prove that the proposed algorithm has advantages of well stability and inherent collision-free characteristic, and can generate more optimal motion path.

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Real-Time Scheduling Algorithm Of Dynamic With Fault-Tolerant In Heterogeneous Distributed Systems, Chongjie Dong, Yuqiang Chen Jun 2020

Real-Time Scheduling Algorithm Of Dynamic With Fault-Tolerant In Heterogeneous Distributed Systems, Chongjie Dong, Yuqiang Chen

Journal of System Simulation

Abstract: The traditional heterogeneous distributed real-time scheduling algorithm didn't give consideration to the dynamic behavior of tasks. An aperiodic non-preemptible and heterogeneous distributed dynamic fault-tolerant model and presenting two fault-tolerant scheduling algorithms was proposed based on this model: DRFSA algorithm and DSFSA algorithm. DRFSA(Dynamic and Reliability-driven of hybrid with Fault-tolerant Scheduling Algorithm)algorithm is to improve the system reliability as the scheduling objective through the reasonable scheduling. DSFSA (Dynamic and Schedulability-driven of hybrid with Fault-tolerant Scheduling Algorithm) algorithm is to improve schedulability as the scheduling objective and tries to enhance the schedulability through less task execution time. Both algorithms can dispatch …

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Novel Method On Features Tracking For Multi-Image Matching, Kaikai Jia, Zhenjie Zhang, Xiangyang Hao Jun 2020

Novel Method On Features Tracking For Multi-Image Matching, Kaikai Jia, Zhenjie Zhang, Xiangyang Hao

Journal of System Simulation

Abstract: Considering the slow motion between adjacent frames in image sequence, optical flow can be applied on image matching. A novel method for multi-image matching based on features tracking was proposed. The algorithm tracked features between adjacent frames, combining with matching strategy and FB Error, to achieve fast and accurate matching. Multi-image matching was finished by tracking features between image sequence. The experimental results show that the novel algorithm improves the efficiency and ensure the accuracy.

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Combination Model Of Network Security Situation Prediction Based On Cooperative Games, Ke Gang Jun 2020

Combination Model Of Network Security Situation Prediction Based On Cooperative Games, Ke Gang

Journal of System Simulation

Abstract: Influenced by a variety of complicated factors, the network security situation has many characteristics, such as highly nonlinear, time-varying, and mutant. It is difficult to predict accurately with a single prediction method. In response to this shortage, a new combined prediction model for network security situation was proposed based on cooperation policy theory. The network security situation was predicted respectively by using the Elman neural network model, GM(1,1)model, support vector machine (SVM) mode. The Shapley value method of cooperative games was applied to determine the weight of each single prediction model, and the prediction results were weighted calculated to …

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Water Purification Device And A Method Of Decontaminating A Water Supply, Dibakar Bhattacharyya, Li Xiao Jun 2020

Water Purification Device And A Method Of Decontaminating A Water Supply, Dibakar Bhattacharyya, Li Xiao

Chemical and Materials Engineering Faculty Patents

A water purification device is provided in the form of a hydrogel matrix containing immobilized nanoparticles that are directly synthesized in-situ in the hydrogel matrix. The hydrogel matrix is temperature sensitive, such that swelling draws in pollutants that are captured by the nanoparticles, while deswelling releases purified water. A related method of decontaminating the water supply contaminated with a target pollutant is also disclosed.

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Modeling Method Of Communication Networks Background Traffic For Counter-Command Simulation Training, Yunjun Lu, Fuli Cai, Zhou Ming Jun 2020

Modeling Method Of Communication Networks Background Traffic For Counter-Command Simulation Training, Yunjun Lu, Fuli Cai, Zhou Ming

Journal of System Simulation

Abstract: For the actual need of the communication networks modeling in combat command simulation, a modeling method of background traffic was proposed which was oriented towards counter-command simulation training under the guidance of basic idea of index modeling. The background traffic model was designed and the simulation verification was carried on. The results indicate that such method is able to generate background traffic rapidly and efficiently, meeting the requirement of simulation training.

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Research Of Partial Synchronization-Based Movement Modeling, Yang Mei, Xu Xiao, Peng Yong, Rusheng Ju, Kedi Huang, Jiao Peng Jun 2020

Research Of Partial Synchronization-Based Movement Modeling, Yang Mei, Xu Xiao, Peng Yong, Rusheng Ju, Kedi Huang, Jiao Peng

Journal of System Simulation

Abstract: An effective method of partial synchronization-based movement modeling was proposed according to the characteristics of running fast and aggregated modeling. A mediate-based ABS M&S framework was analyzed to provide movement mediator for movement modeling. The situations of simple movement and movement with sense interactions were investigated on the basis of movement directive and typical sensor models, and the movement models were built, and the updates and synchronizations of positions were analyzed. The research shows that, the partial synchronization-based movement modeling in high level military analytic simulation can be effectively built to reduce redundant updates and computations of movement.

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