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Articles 69541 - 69570 of 302471

Full-Text Articles in Physical Sciences and Mathematics

Eemd Denoising Method For Neuronal Spike Signals, Wan Hong, Guan Lei, Xinyu Liu Sep 2020

Eemd Denoising Method For Neuronal Spike Signals, Wan Hong, Guan Lei, Xinyu Liu

Journal of System Simulation

Abstract: Spikes which are the basis of the research of brain information are sensitive to noise because they are broadband and small amplitude signal. Based on the fact that spikes are intermittent and nonstationary signals, EMD’s improved algorithm EEMD was adopted to remove noise from neuronal spike signals with wavelet-threshold method. EEMD can solve EMD’s model mixing by separating the intermittent composition in the signal effectively. Comparing with EMD with wavelet-threshold and Multivariate Wavelet, the result of simulation and real data shows that this method can not only improve SNR but also reduce spike waveform distortion. Among the …

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Simulation Study Of Improved Deadbeat Control Method For Voltage Source Inverter, Kun Xia, Ge Yue, Yanneng Zeng, Xu Po Sep 2020

Simulation Study Of Improved Deadbeat Control Method For Voltage Source Inverter, Kun Xia, Ge Yue, Yanneng Zeng, Xu Po

Journal of System Simulation

Abstract: The voltage source inverter is widely used in UPS, the new energy power generation and many other applications. Low THD and rapid system response under all kinds of loads, especially under nonlinear load are required. A new deadbeat control method was proposed according to the discrete state equation of single-phase inverter system, two feed-forward loops were added and a state observer was designed in order to eliminate the delay of sampling and calculation and to improve the system dynamic response. A simulation model of single-phase inverter was constructed in the MATLAB/Simulink environment. The simulation results show that the new …

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Modeling And Control Of Thermal System Of Fuel Cells For Locomotive, Guo Ai, Weirong Chen, Li Qi, Zhixiang Liu, Yankun Li Sep 2020

Modeling And Control Of Thermal System Of Fuel Cells For Locomotive, Guo Ai, Weirong Chen, Li Qi, Zhixiang Liu, Yankun Li

Journal of System Simulation

Abstract: Temperature in the stack plays an important role in ensuring efficient and reliable operations for proton exchange membrane fuel cells driving locomotive which is a new field in railway development. The thermal model of fuel cells for locomotive was built including the stack, bypass, radiator and their resistance to coolant. The control objective that the temperature at inlet of the stack maintained at a setting temperature with the temperature difference between the stack less 10oC was accomplished by adjusting the air flow rate through the radiator and the coolant flow rate through the pump; and the …

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Simulation Research On Armored Equipment Maintenance Support Resource Optimization, Huiqi Zhang, Chunliang Chen, Junyan Liu, Liu Shuai, Yongqing Zhang Sep 2020

Simulation Research On Armored Equipment Maintenance Support Resource Optimization, Huiqi Zhang, Chunliang Chen, Junyan Liu, Liu Shuai, Yongqing Zhang

Journal of System Simulation

Abstract: Contraposing the problem of armored equipment maintenance resource computation and optimization, the armored equipment maintenance support process was analyzed. The armored equipment maintenance support process concept model and the mathematic model were constructed based on discrete system modeling theory; while the simulation model based on net discrete event was given in apply of Anylogic software. The armored equipment maintenance support task fulfilling degree, the resource utilization degree, and the mean maintenance time were got by simulation computation. As a result that maintenance support resource was evaluated based on index weight, and the optimized values of the maintenance support resource …

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Community Detection Algorithm In Multi-Relational Networks, Jingping Yu, Zheng Jie, Guixiang Zhu Sep 2020

Community Detection Algorithm In Multi-Relational Networks, Jingping Yu, Zheng Jie, Guixiang Zhu

Journal of System Simulation

Abstract: In view of the traditional community detection algorithms being mainly applied to single relational networks, ignoring the interaction of relationship in the multi-relational networks, being unable to distinguish the importance of each relation for community detection, a novel algorithm called InteractRank was proposed. Based on the node and the relation of ranking model, the algorithm could transform multi-relational network into single relational network. Combined the PageRank algorithm and the random walk model, the algorithm considered the connection within groups and between groups in multi-relational networks. After transforming into single relational networks, spectral clustering algorithm was adopted to detect community. …

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Research On Battle Simulation Framework Of Warship Integrated Air-Defense And Anti-Missile, Gaofeng Zhang, Liu Shu Sep 2020

Research On Battle Simulation Framework Of Warship Integrated Air-Defense And Anti-Missile, Gaofeng Zhang, Liu Shu

Journal of System Simulation

Abstract: The establishment for simulation framework can effectively improve the efficiency and level of simulation system development, improve the reusability of resources and system ability of adaptive change. The simulation research boundary of warship integrated air-defense and anti-missile battle was confirmed, the corresponding simulation framework was presented from two aspects of tactics and technology. Structure and module function of the tactical simulation framework were clarified. Based on the theory and method of model driven architecture(MDA) and component technology, a flexible reconfiguration technique simulation framework was established. The framework provides a relatively comprehensive and feasible technology method to realize for …

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Simulation Of Anti-Rollover Performance Based On Chassis Collaborative Control, Menglin Wang, Sun Tao, Songlin Zheng, Yuedong Sun Sep 2020

Simulation Of Anti-Rollover Performance Based On Chassis Collaborative Control, Menglin Wang, Sun Tao, Songlin Zheng, Yuedong Sun

Journal of System Simulation

Abstract: Due to the complexity of heavy vehicles traffic and driving cycles, only a standalone control system for anti-rollover has its own limitations. Aiming at the heavy vehicles un-tripped rollover problem, a cooperative control algorithm of continuously adjustable damping semi-active suspension andactive anti-roll bar with dynamic force allocation was proposed. From the simulation results, it is indicated that the cooperative methodology can compensate for the respective limitations of semi-active suspension and anti-roll bar for preventing vehicle rollover and improving vehicle stability to a certain extent.

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Research Of Constant Pressure Delivery Pid Control System Of Flying Ashes, Yanjun Xiao, Yingpei Sun, Xianle Meng, Yongcong Li Sep 2020

Research Of Constant Pressure Delivery Pid Control System Of Flying Ashes, Yanjun Xiao, Yingpei Sun, Xianle Meng, Yongcong Li

Journal of System Simulation

Abstract: Comparing to the drawbacks of fly ash constant current conveying system, the advantages of constant pressure delivery system and its conveying theory were introduced. A scientific modeling of the key of PID controller was established. By introducing the fuzzy control algorithm, the fly ash constant pressure conveying fuzzy adaptive PID controller was designed, which could make the auto changes between the fuzzy control and PID controller come true, and the simulation with MATLAB was researched. The results show that fuzzy adaptive PID controller is superior to the conventional PID controller in overshoot, response speed and adjusting time. And fuzzy …

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Methodology Research For Health Condition Assessment Of Power Supply Based On Simulation, Xuerong Ye, Chen Cen, Yixing Wang, Guofu Zhai Sep 2020

Methodology Research For Health Condition Assessment Of Power Supply Based On Simulation, Xuerong Ye, Chen Cen, Yixing Wang, Guofu Zhai

Journal of System Simulation

Abstract: Currently, the prognostics and health management research of switch mode power supply (SMPS) are mostly based on the field data with specified stress profile, which can hardly be adapted to the application in other stress condition. A methodology research for health condition assessment of power supply based on simulation was proposed. The highly precise model was created for the injection of the quantitative degradation parameters of components. The database containing degradation characteristics of power supply was created by using design of experiment. The functions between stress factors and system outputs were confirmed based on least square method. Thus the …

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Research On Engineering Application Of Atmospheric Environment Simulation, Cai Jun, Liren Xu, Xiaoying Shen Sep 2020

Research On Engineering Application Of Atmospheric Environment Simulation, Cai Jun, Liren Xu, Xiaoying Shen

Journal of System Simulation

Abstract: With the evolution of system simulation, the atmospheric environment simulation technology has developed to come into being an important key common technology, and is rapidly developed towards the larger and more complex tendency. According to the requirement of the engineering application to atmospheric environment simulation, the flow of atmospheric environment simulation application was designed. Some key questions, such as, the representation of atmospheric environment simulation, the verification and validation of environment simulation, the application interface of engineering application, atmospheric environment federation during the application process of atmospheric environment simulation were discussed. The research presents an …

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Study On Hwil Simulation Of Compound Guidance System Based On Radar Signal Injected, Lai Peng, Zhifeng Lu Sep 2020

Study On Hwil Simulation Of Compound Guidance System Based On Radar Signal Injected, Lai Peng, Zhifeng Lu

Journal of System Simulation

Abstract: The hardware-in-the-loop simulation plays a very important role in the research and design process of missile weapons. The architecture of the hardware-in-the-loop simulation system for RF/IR compound guidance was introduced. The model of the passive-wave radar signal based on phase interferometry and the realizing schemes were researched. The hardware-in-the-loop simulation system, which simulated passive-wave radar by signal injection method, was proposed. Experiment results show that the algorithm design of RF/ IR compound Guidance can be tested with the effective support of this system.

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Analysis Of Floating Memcapacitor Emulator And Its Application In Filter Circuits, Guisan Li, Dongsheng Yu Sep 2020

Analysis Of Floating Memcapacitor Emulator And Its Application In Filter Circuits, Guisan Li, Dongsheng Yu

Journal of System Simulation

Abstract: A new equivalent circuit for emulating floating memcapacitor based on active analog chips was designed. By taking square and sinusoidal voltage waveforms as excitation signals, respectively, the frequency-dependence of pinched hysteresis loops of the memcapacitor emulator was tested. In consideration of the controllable memcapacitance, memcapacitor was utilized to structure filers in order to obtain tunable cutoff frequency. Based on PSPICE software, circuit and macro models were used to construct π filter circuits, respectively. Voltage signal containing low and high frequency components were used to test the low pass filtering ability of this circuit. The behaviors of filtered …

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Research On Real-Time Simulation And Simulation Algorithm Optimization Of Igbt’S Switching Characteristics Based On Fpga, Zhaoyan Zhang, Bingshu Wang, Xingwu Wang Sep 2020

Research On Real-Time Simulation And Simulation Algorithm Optimization Of Igbt’S Switching Characteristics Based On Fpga, Zhaoyan Zhang, Bingshu Wang, Xingwu Wang

Journal of System Simulation

Abstract: The model of IGBT switching transient characteristics was established in accordance with IGBT characteristics. The rule of electromagnetic changes in the IGBT switching process was accurately described. The IGBT model was higher precision. Combined with the requirements of real-time simulation, the method of Model optimization which was Single-cycle delay method and function lookup table method was proposed, giving specific implementation method of optimized algorithms on FPGA. The platform of real-time simulation circuit with FPGA as the core was built. The simulation data was consistent with the actual test data. FPGA-based real-time simulation of IGBT switching characteristics solved the …

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Weather And Climate Summary And Forecast: September 2020 Report, Gregory V. Jones Sep 2020

Weather And Climate Summary And Forecast: September 2020 Report, Gregory V. Jones

Linfield University Wine Studies Reports

This report provides a summary of the weather and climate forecast for September 2020. It includes forecast information specific to the Pacific Northwest and the western United States, as well as forecast information for other portions of the United States and abroad.

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Project Gradeup V2, Christopher Strothman Sep 2020

Project Gradeup V2, Christopher Strothman

MS in Computer Science Project Reports

The university classroom has greatly evolved from a simple syllabus and class meeting times to online documentation and virtual classrooms. These developments have changed the way students review their grades and balance their workloads. With the plethora of new technologies, students are often burdened with a full school schedule, work and social events, with few tools to help them effectively understand their grades or manage their time. Moodle did not present data organized in a way that allowed students to easily comprehend their past performance or up coming work load. GradeUp v1 added a plugin to Moodle 2.x to visualize …

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Almost All Missing Data Are Mnar, Thomas R. Knapp Sep 2020

Almost All Missing Data Are Mnar, Thomas R. Knapp

Journal of Modern Applied Statistical Methods

Rubin (1976, and elsewhere) claimed that there are three kinds of “missingness”: missing completely at random; missing at random; and missing not at random. He gave examples of each. The article that now follows takes an opposing view by arguing that almost all missing data are missing not at random.

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Projecting Ev Distribution And Charging Demand: Dvrpc/Uc Davis's Ev Planning Toolkit, Adam Beam Sep 2020

Projecting Ev Distribution And Charging Demand: Dvrpc/Uc Davis's Ev Planning Toolkit, Adam Beam

Sustainability Research & Practice Seminar Presentations

No abstract provided.

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Research On Modeling Of Weapons System Of Systems Evaluation, Jianjun Cao, Haizhou Ma, Delong Jiang Sep 2020

Research On Modeling Of Weapons System Of Systems Evaluation, Jianjun Cao, Haizhou Ma, Delong Jiang

Journal of System Simulation

Abstract: The evaluation of weapons system of systems is an important link in the development of weapons system of systems. It is in the development stage and lacks complete theoretical system and systemic research achievement. Based on improving tentatively the evaluation indexes in evaluation of weapons system of systems, the new strategy of evaluation analysis was proposed by fuzzy mathematics theory. It did not only consider adequately the influence by the evaluation objective, but also built the models of comprehensive evaluation for each link in evaluation process and designed the flow chart for programming. It provided a systemic feasibility …

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Research Of Maglev Train Dynamics Simulation Based On Levitation Control Algorithm, Songqi Li, Kunlun Zhang Sep 2020

Research Of Maglev Train Dynamics Simulation Based On Levitation Control Algorithm, Songqi Li, Kunlun Zhang

Journal of System Simulation

Abstract: A dynamics model for a whole section of the EMS maglev train was built based on MATLAB, the model described the relationship among body - levitation frame - elastic track and had four degrees of freedom. It simulated and analyzed the vehicle-track coupled vibration dynamic behavior while the vehicle passing the elastic tracks at 200 km/h, using three different kinds of control algorithms respectively. The simulation results show that under the condition of a certain speed and fixed vehicle-track physical parameters, the dynamics behaviors of body - levitation frame - track are obviously different by adopting different control algorithm, …

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Fractional Order Internal Model Control Of Pmsm Speed Servo System, Zhicheng Zhao, Sang Hai, Jinggang Zhang Sep 2020

Fractional Order Internal Model Control Of Pmsm Speed Servo System, Zhicheng Zhao, Sang Hai, Jinggang Zhang

Journal of System Simulation

Abstract: A design method of fractional order (FO) internal model controller for permanent magnet synchronous motor (PMSM) speed servo system was proposed. The simplified mathematical model of speed servo system was built. Based on internal model control (IMC) principle, the FO internal model controller was deduced by using the FO filter to replace the integer order one. The proposed controller contained only two adjustable parameters, and the defects of the fractional PIλDμ controller tuning method were effectively overcome. Moreover, the dominant pole was selected according to the time domain performance indicators of the system, and an analytical …

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Simulation And Exergy Analysis Of Aircraft Fuel System, Liu Shuang, Wanyan Xiaoru, Damin Zhuang Sep 2020

Simulation And Exergy Analysis Of Aircraft Fuel System, Liu Shuang, Wanyan Xiaoru, Damin Zhuang

Journal of System Simulation

Abstract: Based on a certain type of aircraft fuel system design for the prototype, and characterized by the self supplied fuel network, the mathematical models of the main components were built. Using the modular structure method, the Simulink/Matlab was adopted for building the simulation modules of various components and forming the whole simulation system. According to the simulation calculation, the flow, pressure and temperature for each node of the fuel system were obtained, and the effects of several parameters of heat exchangers on its exergy losses were analyzed. The present study provides a new method and idea for the modeling …

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Research On Component-Based Modeling Of Combat Simulation Entity, Guohong Du, Wei Wei, Luyao Li Sep 2020

Research On Component-Based Modeling Of Combat Simulation Entity, Guohong Du, Wei Wei, Luyao Li

Journal of System Simulation

Abstract: According to the fact that combat simulation entity models built by traditional modeling method lack of standardization and reusability, based on analysis and induction of combat simulation entity factors, component-based modeling method of combat simulation entity was brought forward. Meanwhile, entity management mechanism of using “scheme-unit-entity-component” and model interaction mechanism of message-derived, event-subscribed and event-dispatched were discussed. The component-based modeling method will provide technique support to build excellent combat simulation entity model and standardizing the development of combat simulation entity model to avoid low-level duplication.

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Attribute Reduction Algorithm On Balancing Profit And Risk, Dexing Wang, Jielong Xu, Hongchun Yuan Sep 2020

Attribute Reduction Algorithm On Balancing Profit And Risk, Dexing Wang, Jielong Xu, Hongchun Yuan

Journal of System Simulation

Abstract: Usually it is taken for granted to achieve the maximal profit at the cost of the minimal risk. It is an important problem of how to balance profit and risk, considering introducing profit and risk to attribute reduction so as to find practical algorithms in decision-making process. A decision-theoretic model was built, which could balance profit and risk combining with decision-theoretic rough set model and minimum risk of Bayes decision and find optimal combinations of risk in a certain level of expected profit, then a heuristic algorithm of attribute reduction was proposed, which took the function of balancing …

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Exploring The Eating Disorder Examination Questionnaire, Clinical Impairment Assessment, And Autism Quotient To Identify Eating Disorder Vulnerability: A Cluster Analysis, Natalia Stewart Rosenfield, Erik Linstead Sep 2020

Exploring The Eating Disorder Examination Questionnaire, Clinical Impairment Assessment, And Autism Quotient To Identify Eating Disorder Vulnerability: A Cluster Analysis, Natalia Stewart Rosenfield, Erik Linstead

Engineering Faculty Articles and Research

Eating disorders are very complicated and many factors play a role in their manifestation. Furthermore, due to the variability in diagnosis and symptoms, treatment for an eating disorder is unique to the individual. As a result, there are numerous assessment tools available, which range from brief survey questionnaires to in-depth interviews conducted by a professional. One of the many benefits to using machine learning is that it offers new insight into datasets that researchers may not previously have, particularly when compared to traditional statistical methods. The aim of this paper was to employ k-means clustering to explore the Eating Disorder …

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A Primer On Statistical Inferences For Finite Populations, Thomas R. Knapp Sep 2020

A Primer On Statistical Inferences For Finite Populations, Thomas R. Knapp

Journal of Modern Applied Statistical Methods

This primer is intended to provide the basic information for sampling without replacement from finite populations.

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Modelingrandom Kelvin Cell Micro-Structure For Open-Cell Foam And Its Application On Compression Response Of Open-Cell Aluminum Foam, Minju Qi, Guangfa Gao Sep 2020

Modelingrandom Kelvin Cell Micro-Structure For Open-Cell Foam And Its Application On Compression Response Of Open-Cell Aluminum Foam, Minju Qi, Guangfa Gao

Journal of System Simulation

Abstract: It is very difficult to model an applicable microstructure for the open cell foams. Using the Python scripting language and the commercial code ABAQUS, the structures for regular Kelvin cell, regular Kelvin open cell foams and random Kelvin open cell foams were designed and modeled automatically. The methodology for modeling, the design and implement for the key algorithms in the process of modeling were presented. For the open cell Aluminum foam, the regular Kelvin cell open cell model and the random Kelvin cell open cell foams model were developed, respectively, and the mechanical responses of them under quasi-static …

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Study On Personalized Data Driven Method Of Surface Of 3d Liver Models, Guodong Chen, Jiexiong Wang, Chen Yi Sep 2020

Study On Personalized Data Driven Method Of Surface Of 3d Liver Models, Guodong Chen, Jiexiong Wang, Chen Yi

Journal of System Simulation

Abstract: The personalization of 3D liver models and the acquisition of liver models with high precision are two key technologies in virtual surgery systems. A personalized data-driven method aiming at the problems of time efficiency and precision of liver models was proposed. The liver model with high precision from previous research achievements and personal CT datasets were processed respectively, and then some feature points were marked on both the model and the CT datasets. The PCA algorithm was used to get the initial matching, the ICP algorithm was used to get the matching of the feature points, and then an …

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Study On Combat Effectiveness Prediction Model Using Elman Feedback Network, Xiaoxi Li, Haoguang Chen, Daxi Li, Jiangping Chen Sep 2020

Study On Combat Effectiveness Prediction Model Using Elman Feedback Network, Xiaoxi Li, Haoguang Chen, Daxi Li, Jiangping Chen

Journal of System Simulation

Abstract: To deal with combat effectiveness prediction of the military system, a SVR-based crucial evaluation indexes mining method was carefully investigated. The key indexes in the effectiveness evaluation were found by comparing partial derivatives. The model of efficiency prediction based on Elman neural networks, which used effective optimized indexs and values as input and output, was exerted to combat effectiveness prediction of C4ISR. The results show that the method can reduce the complexity of prediction model, and avoid uncertain factors existing in system, which provide effective technical support for the combat effectiveness prediction scientifically.

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Research Progress On War Complex System Of Systems Modeling Based On Complex Network, Ma Li, Mingzhi Zhang Sep 2020

Research Progress On War Complex System Of Systems Modeling Based On Complex Network, Ma Li, Mingzhi Zhang

Journal of System Simulation

Abstract: The crucial issue of war complex system of systems (SoS) modeling is to represent the complex coupling and interaction among components of SoS based on networks. The complex network provides new means of SoS modeling. The Characteristics of complex network suitable to SoS modeling were introduced, and two kinds of general method for SOS modeling based on complex network were summed up. The research progress on operational SoS modeling was elaborated from the four aspects of networked description of SoS, modeling algorithm of SoS network, evaluation for SoS based on complex network and the combination of complex network and …

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Research On Interoperability Between Tena And Certain Command & Control System, Zhihua Dong, Yuanchang Zhu, Yanqiang Di, Xianguo Meng Sep 2020

Research On Interoperability Between Tena And Certain Command & Control System, Zhihua Dong, Yuanchang Zhu, Yanqiang Di, Xianguo Meng

Journal of System Simulation

Abstract: The heterogeneity prevents systems from the interoperability between C2 system and TENA for inter-connection in test community. Message Transfer Service contains End-to-End deployment mode and Cross-Network deployment mode, respectively there being two Inter-architecture with TENA system. Gateway can be designed to be single-threaded or multi-threaded. From the perspective of interoperability Gateway realizes the interoperability between communication protocols, object models and supporting services. Cooperation mechanism is designed to achieve the interoperability between the communication mechanism of pull mode in TENA and in C2P; meta-model of Message with OWL, and the object model interoperability is realized through model conversion; self-defined …

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