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Articles 5851 - 5880 of 17350
Full-Text Articles in Engineering
Design & Implement On Virtual Scheduling System Of Great Square Art Performance, Lv Desheng, Guo Yan
Design & Implement On Virtual Scheduling System Of Great Square Art Performance, Lv Desheng, Guo Yan
Journal of System Simulation
Abstract: The work of great art performance in square has a great deal of dynamic visual effects scenes, which combines with formation variation, beautiful music, unique clothing and colorful light. According to the requirements of improving efficiency for scheduling section in handwork performance such as inefficient manual drawing, time-consumed and costly rehearsal, it is an effective way to use technology of computer simulation so as to implement real-time and dynamic intermediary platform among performer, director and audience. To meet various demands in practice, a vision-based formation generation was proposed that the path construction was studied based on linear fitting, …
Review On Interoperability Of Command Information System And Combat Simulation System, Zaijiang Tang, Xiangzhong Xu, Xue Qing, Haohua Xu
Review On Interoperability Of Command Information System And Combat Simulation System, Zaijiang Tang, Xiangzhong Xu, Xue Qing, Haohua Xu
Journal of System Simulation
Abstract: The interoperability of command information system and combat simulation system is an important and difficult problem of building practical training environment. The four aspects of interoperability connotation were summarized. The demands of interoperability were analyzed. The status and development of interoperability, especially for C4ISR/Sim Technical Reference Model (TRM), Battle Management Language (MBL), Levels of Conceptual Interoperability Model (LCIM) were studied. The existing problems were summarized, and four kinds of solutions were proposed. The general technical framework of interoperability based on service oriented architecture was designed, and the interoperability solving method based on Ontology was given.
Total Least-Squares Algorithm For Wiener Errors-In-Variables System Modeling, Ziyun Wang, Zhicheng Ji
Total Least-Squares Algorithm For Wiener Errors-In-Variables System Modeling, Ziyun Wang, Zhicheng Ji
Journal of System Simulation
Abstract: The modeling problem of Wiener errors-in-variables systems was investigated where measurements of the system input and output were corrupted by the additive white Gauss noise. After the provided reformulation of the errors-in-variables system, a two-stage algorithm was developed to estimate the unknown parameters with the first stage employing the total least-squares algorithm, followed by a singular value decomposition in the second stage. The asymptotic maximum likelihood estimation property under the PE condition was strictly proven that with data length tends to infinite, and the proposed total least-squares solution provided an asymptotic maximum likelihood estimate for the nonlinear system parameter …
Molecular Dynamics Of Fluid Properties By Normal Oscillations Of Solid Wall, Haijun Dong, Xiaoqing Lu, Haopeng Zhang, Mingming Shan
Molecular Dynamics Of Fluid Properties By Normal Oscillations Of Solid Wall, Haijun Dong, Xiaoqing Lu, Haopeng Zhang, Mingming Shan
Journal of System Simulation
Abstract: The fluid properties under the condition of the solid wall normal oscillations were studied using the molecular dynamics method. The two dimensional Couette flow model made up of copper wall and argon fluid was built. The fluid state of the near wall was simulated under the different oscillation parameters of solid wall and the corresponding fluid velocity field, the density distribution, the potential energy curves and the friction force were obtained. Then the influence mechanism of the wall oscillations on the frictional drag at liquid-solid interface was investigated. The results indicate that the frictional drag between wall and fluid …
Novel Method To Identify Pmsm Parameters Based On Multiple Linear Regressive Models, Zhenwei Shi, Zhicheng Ji
Novel Method To Identify Pmsm Parameters Based On Multiple Linear Regressive Models, Zhenwei Shi, Zhicheng Ji
Journal of System Simulation
Abstract: A New Coupled Recursive Least Squares (C-FF-RLS) Algorithm with a forgetting factor was proposed for the Parameters Identification of Permanent Magnet Synchronous Motors (PMSMs). The deduced multiple linear regressive models of PMSM were proposed that were simple and appropriate for parameter identification. The C-FF-RLS identification algorithm had a high computational efficiency and a fast convergence speed because which Avoided the Matrix Inversion Operation in the Gain Matrix Compared with the Traditional Multivariable Recursive Least Squares (M-FF-RLS) Algorithm with a Forgetting Factor. The Proposed Identification Algorithm was applied on a simulation system of PMSM. The identification results achieved by …
Guidance Simulation Credibility Evaluation Based On Clustering With Grey Cloud And Entropy Weight, Wang Fei, Xiaogeng Liang, Guo Chao, Peipei Li
Guidance Simulation Credibility Evaluation Based On Clustering With Grey Cloud And Entropy Weight, Wang Fei, Xiaogeng Liang, Guo Chao, Peipei Li
Journal of System Simulation
Abstract: Considering the problems of randomness and fuzziness in evaluating indexes from guidance simulation system, a novel grey clustering comprehensive evaluation model combined with center normal grey cloud whitening function and combination weighting function was presented. The comprehensive credibility evaluation index system for guidance simulation was built. The subjective weight vector of indexes was established by weighting cloud model based on analytic hierarchy process, the objective weight vector of indexes was obtained by entropy weighting method based on the entropy and classified distinction of the normal grey cloud whitening function, then the comprehensive weight vector was acquired by fusing the …
Modeling And Analysis Of Command Control System Based On Devs, Xinlong Li, Xiang Mao
Modeling And Analysis Of Command Control System Based On Devs, Xinlong Li, Xiang Mao
Journal of System Simulation
Abstract: A comprehensive discussion was made on the application of DEVS theory in the modeling of command control (C2) system, which introduced the mathematical model of DEVS, gave the principle of using DEVS to model the C2's behavior and analyze how capability-requirement-measurements effected the simulation. The process and approach of DEVS-Modeling battalion's C2 system were introduced.
Research On Live Migration Scheduling Method For Communication Network Simulation System Based On Vmotion, Yanfang Fu, Gao Xiang, Cheng Bing, Xueyao Feng
Research On Live Migration Scheduling Method For Communication Network Simulation System Based On Vmotion, Yanfang Fu, Gao Xiang, Cheng Bing, Xueyao Feng
Journal of System Simulation
Abstract: In order to make the quality of the simulation service not being affected by load dynamic changes, heuristic scheduling algorithm was proposed. Using the VMotion technology, the virtualization simulation platform was created by calling the SDK. Through the research of the simulation platform application overhead and virtual resource scheduling technology, the single communication network simulation model was modified, implementing the distributed network collaborative simulation which adapted to multiple virtual machines, providing new ideas for the mass communication network simulation system.
Design Of Navigation Electronic Interference System For Flight Simulator, Zengbo Zhou, Chen Xi, Zhenyu Sun, Li Xiang
Design Of Navigation Electronic Interference System For Flight Simulator, Zengbo Zhou, Chen Xi, Zhenyu Sun, Li Xiang
Journal of System Simulation
Abstract: Modern military combat pays more attention to the electronic interference and anti interference, as the important component, the aircraft navigation system is one of the main objects attacked by enemy electronic jamming. In order to simulate the electronic jamming influence on navigation performance of the system, the establishment of an electronic jamming system in aircraft engineering simulator, was designed for the flight simulator interference model and statistical model frame work, and according to the integrity of the system testing and calculation results, the interference was divided into five levels, which not only specified the electrical interference, but also …
Self Formation Development Mode With Vopes, Changming Fu, Chunsheng Long, Tang Hong
Self Formation Development Mode With Vopes, Changming Fu, Chunsheng Long, Tang Hong
Journal of System Simulation
Abstract: To solve the growing conflict between requirements and applications in simulation/visualization, self-formation development mode was proposed: domain experts DIY by WYSWYG in a self-adapting process. VOPES (Visual Open platform for Engineering System) was briefly introduced: integrated architecture, system modeling tools, visualization tools, automatic generation, debugging, deploying, and runtime infrastructure. VOPES enables domain expert to produce distributed simulation/visualization application, no need of coding, complex program skill, hard rules like UML, HLA, DDS, etc. VOPES can be widely used in applications like mission simulation, equipment demonstration, virtual range, training, ITEM. It is especially suitable to the fast, agile, complex simulation/visualization application, …
Design Of Drilling Jumbo Simulation Training System Based On Vega Prime, Youcai Wang, Zilong Guo, Xinhai Xiang, Honghai Luan
Design Of Drilling Jumbo Simulation Training System Based On Vega Prime, Youcai Wang, Zilong Guo, Xinhai Xiang, Honghai Luan
Journal of System Simulation
Abstract: A drilling jumbo simulation training system was developed based on the Vega Prime in the MFC framework. The interactive communication control platform was built based on PCI bus, and then multithreading technology was adopted to achieving the Synchronous data communication between acquisition card and computer. A variety of modeling software was studied to aid Creator modeling method, and then the motion simulation of the drilling jumbo double-arm realization method based on DOF nodes was studied, which realized the real-time dynamic interaction of the system. By using the active 3d stereo imaging principle, the realization method of 3d stereo display …
Boiler Combustion Optimization Based On Bayesian Neural Network And Genetic Algorithm, Haiquan Fang, Huifeng Xue, Li Ning, Fei Xi
Boiler Combustion Optimization Based On Bayesian Neural Network And Genetic Algorithm, Haiquan Fang, Huifeng Xue, Li Ning, Fei Xi
Journal of System Simulation
Abstract: Neural network and genetic algorithm have been extensively used in boiler combustion optimization problems. But the traditional Back Propagation neural network's generalization ability is poor. The Bayesian regularization can improve the neural network's generalization ability. A boiler combustion multi-objective optimization method combining Bayesian regularization BP neural network and genetic algorithm （Bayes NN-GA）was researched. A number of field test data from a boiler was used to simulate the Bayesian neural network model. The results show that the thermal efficiency and NOx emissions predicted by the Bayesian neural network model show good agreement with the measured, and the optimal results show …
Attitude Control Of Three-Axis Flexible Satellite Based On Active-Disturbance-Rejection Sliding Mode Method, Yunjie Wu, Li Chen, Ma Zheng
Attitude Control Of Three-Axis Flexible Satellite Based On Active-Disturbance-Rejection Sliding Mode Method, Yunjie Wu, Li Chen, Ma Zheng
Journal of System Simulation
Abstract: By using Kane method, a mathematical model with CMGs as actuators was built for the three-axis satellite with flexible appendages. An active-disturbance-rejection sliding mode controller was designed for the demand about quickness and stability in attitude control. This controller observed the disturbance by expanded state observer, and compensated the output. The slide mode method in the controller made the system quick and stable. The simulation experiments show that the controller could control the attitude of three-axis satellite efficiently and weaken the vibration of flexible solar panel. The active-disturbance-rejection sliding mode controller shows the merits of both active-disturbance-rejection method …
Least-Energy Maneuver Of Five-Link Manipulator Constrained Within Tunnel Space Using Direct Collocation, Xiuqiang Pan, Chengcai Mei, Junjie Chen
Least-Energy Maneuver Of Five-Link Manipulator Constrained Within Tunnel Space Using Direct Collocation, Xiuqiang Pan, Chengcai Mei, Junjie Chen
Journal of System Simulation
Abstract: Optimal control and designs least-energy maneuver control laws for a five-linked manipulator were applied in order to carry out designated tasks in a confined space. Lagrange-Euler equation described the relationships between the actuators and system dynamics. Euler-Lagrange formulation indicates how optimization can be achieved when optimum occurs. Direct collocation method was introduced in order to solve this highly nonlinear dynamic optimal control problem. Simulations were done to exploit how the manipulator reacted to the constraint. In this study, the diameter of the cylindrical space was shrunken each time by 0.1 meters. The value of the cost function and …
Research Of Multi-Views Based Weapon And Equipment Simulation Model Architecture, Chunguang Peng, Jianhui Deng, Zhang Bo
Research Of Multi-Views Based Weapon And Equipment Simulation Model Architecture, Chunguang Peng, Jianhui Deng, Zhang Bo
Journal of System Simulation
Abstract: ：It's an important approach to build reasonable and complete simulation model architecture for promoting the simulation interoperability, establishing simulation model standards and promoting reusability of models and codes. Some problems existed in the research of simulation model architecture were analyzed. The weapon and equipment simulation model architecture describing method based on multi-views was brought out by using the system engineering theory, which emphasized on the complicated relations between modes and its environment. The method could describe simulation model architecture from different views of different users. Therefore, based on DoDAF and the popular software architecture, five-view models of weapon …
Research On Equipment Operation Capabilities Requirements Based On Exploratory Simulation Experiment Methodology, Zongrui Yan, Yinhua Wu, Chen Yong, Jianshu Dong
Research On Equipment Operation Capabilities Requirements Based On Exploratory Simulation Experiment Methodology, Zongrui Yan, Yinhua Wu, Chen Yong, Jianshu Dong
Journal of System Simulation
Abstract: Analysis on equipment operation requirements is a very difficult problem which has included a lot of uncertain factors, and it can assist peoples to determine whether the equipment item should be started. Exploratory simulation experiment methodology which is synthetized by exploratory analysis and war fighting experimentation can provide a better service for many problems about the equipment demonstration. Through the summary on basic applications exploratory simulation experiments related out comes and its analysis for concrete implementation steps equipment demonstration areas, a tactical level exploratory simulation methodology and its concrete implementation steps were proposed for the operational requirements analysis. An …
Research And Development Of Eicas System Emulator Based On Idata, Baoming Zhao, Hongshu Cheng, Cancan Liu, Jiying Li
Research And Development Of Eicas System Emulator Based On Idata, Baoming Zhao, Hongshu Cheng, Cancan Liu, Jiying Li
Journal of System Simulation
Abstract: Some modeling tools can't design simulation instruments efficiently and conveniently such as OpenGL, etc. A cockpit display development tool of IData was worked in which has graphical user interface and could develop a system easily and rapidly. IData is a method of designing maps and pictures, it can respond variables of application and controlling events in real time and develop graphical interface by clicking on the menu. So IData can reduce the time of graphic development and integration in simulation. In order to render maps in real time, IData used a powerful graphic editor to model for instruments, and …
Diagnosis Of Aircraft Control Surface Fault Based On Semi-Physical Simulation, Yunlong Li, Xia Jie, Zifang Shi
Diagnosis Of Aircraft Control Surface Fault Based On Semi-Physical Simulation, Yunlong Li, Xia Jie, Zifang Shi
Journal of System Simulation
Abstract: The aircraft control surface defaults of rudders were mainly divided into jam fault and damage fault. On the basis of the relationship between motor toque and hinge moment, a new method of using the motor voltage was proposed to detect the control surface'faults of rudder. And the method could detect the damage degree of the faults. Torque motor was used to play the role of hinge moment. And the new method was simulated by Semi-Physical system which is consisted of dSPACE system, PC and simulated rudder actuator. The results show that, the damage faults and jam faults can be …
Research On Scenario-Driven Component-Based Model Composition Method, Jianchun Zhang, Fengju Kang
Research On Scenario-Driven Component-Based Model Composition Method, Jianchun Zhang, Fengju Kang
Journal of System Simulation
Abstract: To fulfil the requirements for fast, easy and integrated modeling under certain operation conditions, a model composition method of scenario-driven was proposed. Starting with corresponding composition framework, traditional component models were extended through corresponding meta-model and normalization description of scenario was given. Furthermore, a full combat simulation system could be constructed quickly by realizing integrated process including three processes: scenario parse, model search and match. By preliminarily performing underwater weapon system modeling and simulation application, the result shows efficiency of this composition method.
A 3d Image-Guided System To Improve Myocardial Revascularization Decision-Making For Patients With Coronary Artery Disease, Haipeng Tang
A 3d Image-Guided System To Improve Myocardial Revascularization Decision-Making For Patients With Coronary Artery Disease, Haipeng Tang
Dissertations
OBJECTIVES. Coronary artery disease (CAD) is the most common type of heart disease and kills over 360,000 people a year in the United States. Myocardial revascularization (MR) is a standard interventional treatment for patients with stable CAD. Fluoroscopy angiography is real-time anatomical imaging and routinely used to guide MR by visually estimating the percent stenosis of coronary arteries. However, a lot of patients do not benefit from the anatomical information-guided MR without functional testing. Single-photon emission computed tomography (SPECT) myocardial perfusion imaging (MPI) is a widely used functional testing for CAD evaluation but limits to the absence of anatomical information. …
Snitch Application: Addressing Cyber Trust In Future Living Spaces, Russell Moore
Snitch Application: Addressing Cyber Trust In Future Living Spaces, Russell Moore
Cybersecurity Undergraduate Research Showcase
The future of smart homes is filled with excitement and ample opportunity to live in an environment that features extraordinary convenience and energy efficiency. Devices such as Amazon Alexa and Roku Smart TV’s feature voice interaction options that provide the user with enhanced functionality. While voice-activated devices are accommodating, it is imperative to acknowledge how they work on the backend. The problem is that these devices collect and share a large amount of data from users who are oftentimes unaware that it’s even happening. The Snitch App is being developed in order to inform the user of what exactly is …
A Framework To Support Automatic Certification For Self-Adaptive Systems, Ioannis Nearchou
A Framework To Support Automatic Certification For Self-Adaptive Systems, Ioannis Nearchou
Masters Theses
Presently, cyber-physical systems are increasingly being integrated into societies, from the economic sector to the nuclear energy sector. Cyber-physical systems are systems that combine physical, digital, human, and other components, which operate through physical means and software. When system errors occur, the consequences of malfunction could negatively impact human life. Academic studies have relied on the MAPE-K feedback loop model to develop various system components to satisfy the self-adaptive features, such that violation of the safety requirements can be minimized. Assurance of system requirement satisfaction is argued through an industrial standard form, called an assurance case, which is usually applied …
An Investigation Into Multi-View Error Correcting Output Code Classifiers Applied To Organ Tissue Classification, Daniel Alvarez
An Investigation Into Multi-View Error Correcting Output Code Classifiers Applied To Organ Tissue Classification, Daniel Alvarez
UNLV Theses, Dissertations, Professional Papers, and Capstones
Large amounts of data is being generated constantly each day, so much data that it is difficult to find patterns in order to predict outcomes and make decisions for both humans and machines alike. It would be useful if this data could be simplified using machine learning techniques. For example, biological cell identity is dependent on many factors tied to genetic processes. Such factors include proteins, gene transcription, and gene methylation. Each of these factors are highly complex mechanism with immense amounts of data. Simplifying these can then be helpful in finding patterns in them. Error-Correcting Output Codes (ECOC) does …
Learning Transferrable Parameters For Long-Tailed Sequential User Behavior Modeling, Jianwen Yin, Chenghao Liu, Weiqing Wang, Jianling Sun, Steven C. H. Hoi
Learning Transferrable Parameters For Long-Tailed Sequential User Behavior Modeling, Jianwen Yin, Chenghao Liu, Weiqing Wang, Jianling Sun, Steven C. H. Hoi
Research Collection School Of Computing and Information Systems
Sequential user behavior modeling plays a crucial role in online user-oriented services, such as product purchasing, news feed consumption, and online advertising. The performance of sequential modeling heavily depends on the scale and quality of historical behaviors. However, the number of user behaviors inherently follows a long-tailed distribution, which has been seldom explored. In this work, we argue that focusing on tail users could bring more benefits and address the long tails issue by learning transferrable parameters from both optimization and feature perspectives. Specifically, we propose a gradient alignment optimizer and adopt an adversarial training scheme to facilitate knowledge transfer …
Social Participation Performance Of Wheelchair Users Using Clustering And Geolocational Sensor's Data, Yukun Yin, Kar Way Tan
Social Participation Performance Of Wheelchair Users Using Clustering And Geolocational Sensor's Data, Yukun Yin, Kar Way Tan
Research Collection School Of Computing and Information Systems
For wheelchair users, social participation and physical mobility play a significant part in determining their mental health and quality of life outcomes. However, little is known about how wheelchair users move about and engage in social interactions within their life-spaces. In this project, we investigate the social participation performance of the wheelchair users based on a combination of geolocational and lifestyle survey data collected over a period of three months. This paper adopts a multi-variate approach combining geolocational travel patterns and various factors such as independence, willingness and self-perception to provide multi-faceted analysis to their lifestyles. We provide profiles of …
Emergency Department Systems Engineering: Modelling And Event Simulation, O Alharethi Salman Zayed
Emergency Department Systems Engineering: Modelling And Event Simulation, O Alharethi Salman Zayed
Student Works (2020-2029)
Emergency department systems are meant to ensure the timely delivery for essential healthcare services through complex systems. (ED) offers various services and have several components in its parts. Examined long previous research on system engineering and quality of healthcare resulting on these are influenced by operational management. Real time data are very helpful for decision making for any systems. Patient output feedback and satisfaction can be ensured with engineered management. EDs have become evident particularly in current scenario when the world is in the grip of the deadly COVID-19. All this implies that analysis is significant for improvement of services …
Application Of Artificial Intelligence And Geographic Information System For Developing Automated Walkability Score, Md Mehedi Hasan
Application Of Artificial Intelligence And Geographic Information System For Developing Automated Walkability Score, Md Mehedi Hasan
Dissertations
Walking is considered as one of the major modes of active transportation, which contributes to the livability of cities. It is highly important to ensure walk friendly sidewalks to promote human physical activities along roads. Over the last two decades, different walk scores were estimated in respect to walkability measures by applying different methods and approaches. However, in the era of big data and machine learning revolution, there is still a gap to measure the composite walkability score in an automated way by applying and quantifying the activityfriendliness of walkable streets. In this study, a street-level automated walkability score was …
Investigating Single Precision Floating General Matrix Multiply In Heterogeneous Hardware, Steven Harris
Investigating Single Precision Floating General Matrix Multiply In Heterogeneous Hardware, Steven Harris
McKelvey School of Engineering Graduate Student Theses & Dissertations
The fundamental operation of matrix multiplication is ubiquitous across a myriad of disciplines. Yet, the identification of new optimizations for matrix multiplication remains relevant for emerging hardware architectures and heterogeneous systems. Frameworks such as OpenCL enable computation orchestration on existing systems, and its availability using the Intel High Level Synthesis compiler allows users to architect new designs for reconfigurable hardware using C/C++. Using the HARPv2 as a vehicle for exploration, we investigate the utility of several of the most notable matrix multiplication optimizations to better understand the performance portability of OpenCL and the implications for such optimizations on this and …
Waste Cooking Oil Classification Using Artificial Intelligence Technology, Kar Sin Lau
Waste Cooking Oil Classification Using Artificial Intelligence Technology, Kar Sin Lau
Student Works (2020-2029)
Palm oil – one of the most common edible oil consumed in Malaysia. It is because Malaysia is one of the countries which supply palm oil to the global market and it is cheap to obtain for the consumer in Malaysia. Most of the Malaysian consume it via food preparation such as deep-frying and cooking. However, due to widely available for Malaysians, consumers also lacking awareness in dealing after using the edible oil. Most of the household consumers discard excess waste cooking oil (WCO) into sewage and with courtesy, some of them stored them in containers and sell to NGOs. …
Three-Dimensional (3d) Reconstruction Of Ultrasound Foetal Images Using Visualisation Toolkit (Vtk), Henry Dusim Grace Anabela
Three-Dimensional (3d) Reconstruction Of Ultrasound Foetal Images Using Visualisation Toolkit (Vtk), Henry Dusim Grace Anabela
Student Works (2020-2029)
Three-dimensional (3D) reconstruction of two-dimensional (2D) ultrasound images has been used for easier analysing of anatomy related to abnormalities. 3D image reconstruction is required as it helps doctors interpret results and assess any defects quickly. Not only does it improve the accuracy of diagnosis, but it also saves a lot of time. In this thesis, 295 slices of 2D ultrasound images of a foetal are used to do 3D reconstruction using surface rendering, volume rendering, and multiplanar rendering technique. A similar software known as 3D Slicer is also used to reconstruct the ultrasound image for comparison purpose. VTK can easily …