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Articles 7861 - 7890 of 25747

Full-Text Articles in Engineering

Novel Modeling Of Memristive Cellular Neural Network And Its Circuit Simulation, Xiaohong Zhang, Linyu Liao, Lianghua Yu Aug 2020

Novel Modeling Of Memristive Cellular Neural Network And Its Circuit Simulation, Xiaohong Zhang, Linyu Liao, Lianghua Yu

Journal of System Simulation

Abstract: The memristor as the fourth fundamental circuit component included along with the resistor, capacitor and inductor could simulate the storage memory function of brain neural network. A traditional three-dimensional CNN was designed, and the output function was implemented with the nonlinear characteristics of a flux-controlled memristor. The conventional electronic devices in Multisim were utilized to simulate flux-controlled memristor which simplified the output function part of the circuits. To compare with the CNN system which has chaotic behaviors, the circuits of novel memristive cellular neural network not only can show a chaos attractors phenomenon, but also the inner magnetic energy …

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Using Raster Lattices To Build Terrain Attribute Of Wargame Map, Jinming Zhang Aug 2020

Using Raster Lattices To Build Terrain Attribute Of Wargame Map, Jinming Zhang

Journal of System Simulation

Abstract: Wargame map is a sketchy description of geographical environment under certain conditions. It is used to assist commanders or operational models to locate spatial positions and to determine spatial attributes. The former process is called geometric modeling and the latter attribute modeling, and the combination of which is known as Wargame Map Modeling. A Raster Lattice Algorithm for attribute modeling was proposed, which could effectively reduce modeling complexity and improve modeling efficiency. The basic process of attribute modeling and discussing its difficulty was described, i.e., the calculation of the covered areal ratio between hexagon and the geographical environment element. …

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Stylization Rendering Algorithm Based On Interactive Graph Cuts Method For Image Segmentation, Zhao Yang, Guowu Yuan, Dangen Xie, Xu Dan Aug 2020

Stylization Rendering Algorithm Based On Interactive Graph Cuts Method For Image Segmentation, Zhao Yang, Guowu Yuan, Dangen Xie, Xu Dan

Journal of System Simulation

Abstract: The image is cut into two parts, the object and background, using the Graph Cuts interactive image segmentation algorithm. Through interactive image segmentation, user segmented image into a foreground region and a background region. For background area, a variety of non-photorealistic rendering algorithm was designed, which could render the original image into artistic images with other cartoon painting, pencil drawing or painting style. For foreground region, the algorithm maintained its feathers unchanged. By merging foreground and background areas, the artistic images were obtained with variety styles. Experiments show that the algorithm designed can get the desired result for processing …

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Multiresolution Scene Matching Algorithm For Infrared And Visible Images Based On Non-Subsampled Contourlet Transform, Liu Gang, Guangyu Wang, Zhou Heng, Mingjing Wang Aug 2020

Multiresolution Scene Matching Algorithm For Infrared And Visible Images Based On Non-Subsampled Contourlet Transform, Liu Gang, Guangyu Wang, Zhou Heng, Mingjing Wang

Journal of System Simulation

Abstract: Aiming at scene matching problem for taking infrared image as the actual data and the visible image as the referenced data, a multiresolution matching algorithm was proposed based on non-subsampled contourlet transform (NSCT). By using the transform of phase congruency transform, the difference of grayscale and contrast between infrared image and visible light image was weakened. Subsequently, the two types of images were separately transformed into non-subsampled contourlet domain and the proposed method took the Krawtchouk invariant moment as matching feature. The presented method, which used the improved genetic algorithm (GA) as searching strategy which conquered the precocious phenomenon, …

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State Estimation Approach By Fusing Delayed Measurements And Its Application, Pengcheng Qi, Zhonggai Zhao, Liu Fei Aug 2020

State Estimation Approach By Fusing Delayed Measurements And Its Application, Pengcheng Qi, Zhonggai Zhao, Liu Fei

Journal of System Simulation

Abstract: In batch processes, the key parameters were usually obtained online with low accuracy or offline with large time delay, and a state estimation algorithm was proposed to estimate the key parameters by incorporating delayed measurements with the real-time measurements. Due to the different sampling intervals of these two kinds of measurements, two cases were analyzed, including the case of only real-time measurements available and the case of both real-time and delayed measurements available. Considering the nature of nonlinearity and non-Gaussianity in batch processes, the particle filter algorithm was introduced for the state estimation, and it was further extended …

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Repairable K/N Voting System Life Situation Model Analysis And Simulation From Time Response, Yongfeng Fang, Jianjun Chen Aug 2020

Repairable K/N Voting System Life Situation Model Analysis And Simulation From Time Response, Yongfeng Fang, Jianjun Chen

Journal of System Simulation

Abstract: For the k of k/n system is given according to the one's experience in the current, the probability of the failure of the singular system components was given according to the stress-strength interference theory and the load distribution of the component withstand. The dynamic reliability prediction model of the repairable k/n system was established by using probabilistic differential equations and by the repairable system components moving in reliable and failure. The equation was solved and their answers were shown to give the precisely k when the k would be determined. The model shows accuracy and feasibility …

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Research On Cholecystectomy Virtual Surgery Simulation Training Platform, Wang Jun, Liu Dong Aug 2020

Research On Cholecystectomy Virtual Surgery Simulation Training Platform, Wang Jun, Liu Dong

Journal of System Simulation

Abstract: The main performance factors in virtual surgery system with immersion are real-time, realistic deformation and smooth feel handle. A kind of cholecystectomy simulation training platform with force feedback feel was built, putting forward a kind of collision detection method based on Capsule-Sphere mixture model of different model with different bounding box in the real-time and a kind of mass-spring deformation method based on mesh-skeleton model in the force-deformation, and being tested on the virtual surgery force feedback device in prophase research. The experimental results show that the two modes are applied to the virtual cholecystectomy simulation and the platform …

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Simulation And Analysis Of Airborne Phase Array Weather Radar Reflectivity, Wang Lei, Chaopeng Yu, Liu Ping Aug 2020

Simulation And Analysis Of Airborne Phase Array Weather Radar Reflectivity, Wang Lei, Chaopeng Yu, Liu Ping

Journal of System Simulation

Abstract: The relation between radar parameters such as radar gain, beam width and impulse width and radar reflectivity based on the parameters of airborne phase array weather radar at X-band were proposed. Combined with weather radar equation correction and flight parameters, horizontal sector scanning and vertical sector scanning reflectivity data of airborne phased array weather radar were simulated based on new generation weather radar (CINRAD/SA) reflectivity. The results show that along the radial direction, the distance resolution of airborne phase array radar used impulse compress technology is higher than new generation weather radar and along the shear direction, because antenna …

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Simulation Research On Wireless Power Transmission System Of Cardiac Pacemaker Based On Magnetic Resonance, Xiuquan Liu, Yanhong Li, Huang Ping Aug 2020

Simulation Research On Wireless Power Transmission System Of Cardiac Pacemaker Based On Magnetic Resonance, Xiuquan Liu, Yanhong Li, Huang Ping

Journal of System Simulation

Abstract: Aiming at disadvantages of the battery limited supply time of the implantable cardiac pacemaker and the actual application of electromagnetic induction wireless power transmission (WPT) system, the resonant WPT technology was proposed. The basic working principle of a WPT system of the implantable cardiac pacemaker was introduced. Based on Magnetic resonance coupling and mutual inductance calculation model, the mathematics models of the WPT system of the cardiac pacemaker were established. By the accurate formulae of the mutual inductance of the primary and secondary coreless coils, the influences of the parameters, such as the axial distance, radial offset and coli …

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Virtual Reality Game For Head Rehabilitation Based On Kinect, Shutao Shen, Gao Fei, Xu Ning Aug 2020

Virtual Reality Game For Head Rehabilitation Based On Kinect, Shutao Shen, Gao Fei, Xu Ning

Journal of System Simulation

Abstract: The application of virtual reality in the rehabilitation has been extensively studied, which helps patients after a stroke independently perform daily living activities, while saving time, money and other costs. This study used Microsoft Kinect virtual reality game to assess the movement of the users. The game required movement outside of the head, torso and arms. In nine games exercise, the average and maximum amount of movement remained unchanged. However, with the increase of exercise, the frequency of head movement increased. The results show that by head movement, video games can be used to balance the posture rehabilitation, …

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Study Of Synchronization For Fractional-Order Hyperchaotic System And Its Application In Secure Communication, Xue Wei, Jinkang Xu, Hongyan Jia Aug 2020

Study Of Synchronization For Fractional-Order Hyperchaotic System And Its Application In Secure Communication, Xue Wei, Jinkang Xu, Hongyan Jia

Journal of System Simulation

Abstract: A unidirectionally coupled synchronization method was adopted to design and implement the synchronization for the reported commensurate fractional-order hyperchaotic system, and its correctness and effectiveness were analyzed in theory. Moreover, taking an example of 3.6-order hyperchaotic system, analog circuits were designed to implement the fractional-order hyperchaotic system and its unidirectionally coupled synchronization with the frequency-domain approximation method based on Bode diagram. By conducting the circuit implementation, it is found that the results of the circuit implementation are in good agreement with those of the numerical simulation, which demonstrates the feasibility of the synchronization. On this basis, a secure communication …

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Circus In Motion: A Multimodal Exergame Supporting Vestibular Therapy For Children With Autism, Oscar Peña, Franceli L. Cibrian, Monica Tentori Aug 2020

Circus In Motion: A Multimodal Exergame Supporting Vestibular Therapy For Children With Autism, Oscar Peña, Franceli L. Cibrian, Monica Tentori

Engineering Faculty Articles and Research

Exergames are serious games that involve physical exertion and are thought of as a form of exercise by using novel input models. Exergames are promising in improving the vestibular differences of children with autism but often lack of adaptation mechanisms that adjust the difficulty level of the exergame. In this paper, we present the design and development of Circus in Motion, a multimodal exergame supporting children with autism with the practice of non-locomotor movements. We describe how the data from a 3D depth camera enables the tracking of non-locomotor movements allowing children to naturally interact with the exergame . A …

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The Law Of Black Mirror - Syllabus, Yafit Lev-Aretz, Nizan Packin Aug 2020

The Law Of Black Mirror - Syllabus, Yafit Lev-Aretz, Nizan Packin

Open Educational Resources

Using episodes from the show Black Mirror as a study tool - a show that features tales that explore techno-paranoia - the course analyzes legal and policy considerations of futuristic or hypothetical case studies. The case studies tap into the collective unease about the modern world and bring up a variety of fascinating key philosophical, legal, and economic-based questions.

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Tech Policy And Legal Theory Syllabus, Yafit Lev-Aretz, Nizan Packin Aug 2020

Tech Policy And Legal Theory Syllabus, Yafit Lev-Aretz, Nizan Packin

Open Educational Resources

Technology has changed dramatically over the last couple of decades. Currently, virtually all business industries are powered by large quantities of data. The potential as well as actual uses of business data, which oftentimes includes personal user data, raise complex issues of informed consent and data protection. This course will explore many of these complex issues, with the goal of guiding students into thinking about tech policy from a broad ethical perspective as well as preparing students to responsibly conduct themselves in different areas and industries in a world growingly dominated by technology.

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Blockchain And Its Transformational Impact To Global Business, Mohammed Qaudeer Aug 2020

Blockchain And Its Transformational Impact To Global Business, Mohammed Qaudeer

Operations Research and Engineering Management Theses and Dissertations

The advent of internet to the public back in 1994 resulted in the 4th industrial revolution disrupting and transforming business and communication models. As much as the transformation changed our lives and experiences, it has resulted in centralized models like Amazon and Facebook. It also resulted in exponential growth of Fraud, Identity theft, and lack of trust. Blockchain is considered an emerging technology of this era, which will trigger the 5th industrial revolution enabling another massive storm of disruptive transformation completely changing the current business models based on trust, security, collaboration and crypto currency. As the evolution of blockchain technology …

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First Year Students' Experience In A Cyber World Course - An Evaluation, Frank Breitinger, Ryan Tully-Doyle, Kristen Przyborski, Lauren Beck, Ronald S. Harichandran Aug 2020

First Year Students' Experience In A Cyber World Course - An Evaluation, Frank Breitinger, Ryan Tully-Doyle, Kristen Przyborski, Lauren Beck, Ronald S. Harichandran

Electrical & Computer Engineering and Computer Science Faculty Publications

Although cybersecurity is a major present concern, it is not a required subject in University. In response, we developed Cyber World which introduces students to eight highly important cybersecurity topics (primarily taught by none cybersecurity experts). We embedded it into our critical thinking Common Course (core curriculum) which is a team-taught first-year experience required for all students. Cyber World was first taught in Fall 2018 to a cohort of over 150 students from various majors at the University of New Haven. This article presents the evaluation of our Fall taught course. In detail, we compare the performance of Cyber World …

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Domain Specific Computing In Tightly-Coupled Heterogeneous Systems, Anthony Michael Cabrera Aug 2020

Domain Specific Computing In Tightly-Coupled Heterogeneous Systems, Anthony Michael Cabrera

McKelvey School of Engineering Graduate Student Theses & Dissertations

Over the past several decades, researchers and programmers across many disciplines have relied on Moores law and Dennard scaling for increases in compute capability in modern processors. However, recent data suggest that the number of transistors per square inch on integrated circuits is losing pace with Moores laws projection due to the breakdown of Dennard scaling at smaller semiconductor process nodes. This has signaled the beginning of a new “golden age in computer architecture” in which the paradigm will be shifted from improving traditional processor performance for general tasks to architecting hardware that executes a class of applications in a …

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Review Of 3d Flow Visualization, Hange Song, Shiguang Liu Aug 2020

Review Of 3d Flow Visualization, Hange Song, Shiguang Liu

Journal of System Simulation

Abstract: 3D flow visualization describes the complex flow structure by computer graphics methods, reveals the internal laws and physical characteristics of the fluid, and has an important role in the aviation, atmosphere, and medicine and so on. There are many problems to be solved in the 3D flow visualization because of the dimension and the data scale of the 3D space. The classification of the 3D flow visualization was showed by the research status and methods, which could be divided the line-based visualization, surface-based visualization, volume rendering and texture-based visualization. The progress and problems in the above aspects were …

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Fast Implementation Of Virtual Prototyping Modeling Based On Assembly Model, Wang Yu, Shouwen Yao, Jilin Liu, Dezhi Huang, Qinghua Zhang, Yi Ran Aug 2020

Fast Implementation Of Virtual Prototyping Modeling Based On Assembly Model, Wang Yu, Shouwen Yao, Jilin Liu, Dezhi Huang, Qinghua Zhang, Yi Ran

Journal of System Simulation

Abstract: A new method of virtual prototyping modeling was proposed based on assembly model, concerning the relation between assembly forms and dynamic constrains. With the transformation of assembly forms and dynamic constrains, a virtual prototyping model was built by the use of constrain models. Analysis of principle of modeling virtual prototype based on assembly was carried out, and the corresponding relationship between the assembly constraints in Pro/E and constraint block was studied and the method of modeling gear transmission was researched. With the utility of SimMechanics, a model library facing mechanism analysis under Simulink, a concept verification of a simple …

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Research On Simulation Of Flexible Rope For Ship, Mincang Liang, Yin Yong Aug 2020

Research On Simulation Of Flexible Rope For Ship, Mincang Liang, Yin Yong

Journal of System Simulation

Abstract: In view of the problems on unreal-time, less realistic and the instability of the marine flexible rope simulation system, one kind of structure-bending spring model was proposed based on the traditional mass-spring model. Bending springs were added in the model to limit the abnormal bending phenomenon in the particle of model by setting different elasticity and damping coefficient for two kinds of spring to simulate the ropes with different rigidity. In order to guarantee the stability and accuracy of the model, improved Euler method was adopted for numerical solution. At the same time, position adjustment method and speed …

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Impact Of Consistency Between Visually Perceived Movement And Real Movement On Cybersickness, Cai Li, Dongdong Weng, Zhenliang Zhang, Xingyao Yu Aug 2020

Impact Of Consistency Between Visually Perceived Movement And Real Movement On Cybersickness, Cai Li, Dongdong Weng, Zhenliang Zhang, Xingyao Yu

Journal of System Simulation

Abstract: The cybersickness is still a huge obstacle for virtual reality (VR) system. Current researches on cybersickness are mostly based on static or dynamic simulators, while studies in the real movement state is rare. An evaluating system which employed a head-mounted display (HMD) with a running vehicle was proposed to study the cybersickness in the real movement state. In this system, users sitting in the vehicle could see virtual scenes which was consistent with the real motion through the HMD. Subjective and objective evaluating experiments were proposed to analyze the different levels of the cybersickness caused by visual-vestibular conflict. …

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Ship Floating Calculation Based On Cgal, Zhizhou Wang, Xiaofeng Sun, Yin Yong, Chunlei Liu Aug 2020

Ship Floating Calculation Based On Cgal, Zhizhou Wang, Xiaofeng Sun, Yin Yong, Chunlei Liu

Journal of System Simulation

Abstract: To improve the computational accuracy of ship floating condition, a method of ship floating calculation was proposed based on CGAL (Computational Geometry Algorithms Library). By using the slicing module in CGAL, the offset table was obtained through longitudinally slicing 3D design surface; The shell data were gained by simplification and equidistant offsetting; The Jacobi matrix coefficients were achieved by intersecting water plane and shell data; Ship floating condition equations were solved by Newton iteration method. Taking Bulk carrier "SHANDONG REN HE" as an example, ship floating calculations under ten typical loading conditions were carried out. The computational error between …

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Paralleled Dynamic Crowd Emotion Contagion Algorithm, Xiang Nan, Mingmin Zhang, Lingyun Zhu Aug 2020

Paralleled Dynamic Crowd Emotion Contagion Algorithm, Xiang Nan, Mingmin Zhang, Lingyun Zhu

Journal of System Simulation

Abstract: As the positions of crowd usually change dynamically, then computing the contagion process becomes a challenge. There current algorithms were too time consuming to be adopted as they needed to calculate the reactions between every two objects. In order to solve this problem, a social force based contagion computing algorithm with GPU acceleration was provided. Individuals’ affection fields were projected onto two dimensional mesh grid and represented by the nine-box diary; The social force reactions between individual and nearest neighbors were computed to get the moving position; The contagion results from nearest neighbors were calculated. All of these steps …

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Overview Of Cartogram Algorithm, Chen Yi, Yunfang Zhao, Xiaomin Du Aug 2020

Overview Of Cartogram Algorithm, Chen Yi, Yunfang Zhao, Xiaomin Du

Journal of System Simulation

Abstract: Cartogram is a type of visualization method for effectively presenting the geographical information distribution of the statistical data, which has a wide range of usage in many fields. The concepts, classifications and generation methods of the Cartogram were described. Different generation algorithms of it were summarized, considering the continuity and regularity features. Besides, from the two aspects of both statistical and geographical distortions, three evaluation indexes were proposed: an index that evaluated whether the area sizes represented the true attribute values; and one which represented the degree of the regional shape distortions; and last but not the …

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Random-Walk Smokescreen Simulation Model Of Real-Time Correction, Sun Xun, Xuanyu Wang, Wang Xian, Shunhua Liu Aug 2020

Random-Walk Smokescreen Simulation Model Of Real-Time Correction, Sun Xun, Xuanyu Wang, Wang Xian, Shunhua Liu

Journal of System Simulation

Abstract: Gaussian diffusion mode of smokescreen is not suitable for complex atmospheric conditions and it is not easy to accurately obtain statistical properties of particles by utilizing random-walk mode, so the practicability of these two kinds of modes is limited. In view of the problems mentioned above, the revised random-walk smokescreen simulation model method was put forward, in the method, mathematical morphology algorithm was utilized to detect the data on smokescreen edge in a video in real-time and the model was rectified in real-time on basis of such data. The test result indicates that the revised model is suitable for …

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Fast Image Blending Using Seeded Region Growing, Yili Zhao, Xu Dan, Wenhua Qian, Zhang Yan Aug 2020

Fast Image Blending Using Seeded Region Growing, Yili Zhao, Xu Dan, Wenhua Qian, Zhang Yan

Journal of System Simulation

Abstract: This paper presented a novel approach for combining and blending a set of aligned images into a composite mosaic with no visible seams. The compositing seam is found efficiently via seeded region growing using a photometric criterion. A contribution of this paper is to use seeded region growing on image differences to find possible seams over areas of low photometric difference. This can result in significant reduction of blending time. The using of seeded region growing over image pairs guaranteed the approximate optimal solution for each intersection region. The independence of such regions makes the algorithm suitable for parallel …

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Design Of Simulation System About Laser Weapon Cooperative Engagement, Wang Xin, Xu Lei, Zhiyong Su Aug 2020

Design Of Simulation System About Laser Weapon Cooperative Engagement, Wang Xin, Xu Lei, Zhiyong Su

Journal of System Simulation

Abstract: To satisfy the need of air defense combat in the future, the concept of cooperative combat of new laser weapons and traditional anti-aircraft weapons was proposed. The simulation system based on HLA aimed to improve the performance of the system of traditional anti-aircraft weapons. The whole system was mainly divided into three parts: simulation platform, equipment simulation and three-dimensional simulation. Firstly, the object class and interaction class were designed according to federal members and federal integration. Then the important part was the three-dimensional modeling and simulation work of every weapon system. Finally, the air defense simulation system was …

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3d Real-Time Visualization And Simulation Platform For Collaborative Path Planning Of Ua, Chen Gong, Xu Lei, Zhiyong Su Aug 2020

3d Real-Time Visualization And Simulation Platform For Collaborative Path Planning Of Ua, Chen Gong, Xu Lei, Zhiyong Su

Journal of System Simulation

Abstract: There are still some issues existing in current path planning of UAV, such as planning result simulation verification and 3D visualization. To solve the problems, a 3D real-time visualization and simulation platform for collaborative path planning of UAV was proposed. The target area was divided and calculated. The reconnaissance beam of UAV was modeled with virtual camera, the intersection points obtained quickly based on graphics hardware. The terrain mesh was calculated by scan-line polygon filling algorithm, reconnaissance information was recorded and analyzed, and the color temperature maps were given. Through the actual operation by the simulation platform, simulation …

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Three-Dimensional Data Exploration Technology Based On Large-Scale Complex Geometrical Surfaces, Zhiwei Ai, Cao Yi, Xiao Li, Huawei Wang Aug 2020

Three-Dimensional Data Exploration Technology Based On Large-Scale Complex Geometrical Surfaces, Zhiwei Ai, Cao Yi, Xiao Li, Huawei Wang

Journal of System Simulation

Abstract: Three-dimensional physical field data exploration visualization based on large scale complex geometric surface is of great value in three-dimensional electromagnetic simulation applications. Research was proposed which was suitable for massively parallel processing technology of three-dimensional data exploration. The concept of dual-data-source and data filtering policies was introduced based on contracts. Clipping algorithms based on spatial bounding box and data probing algorithm can support accurate three-dimensional data profiling for complex surface geometry. Research results have been applied to significant practical applications, such as the fuselage characteristics of electric field distribution analysis and high value targets within the seeker's accurate …

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Research On Space Environment Simulation Technology Based On Mobile Platform, Xiaofei Hu, Zhou Yang, Pengfei Li, Jiwei Xu, Xianguang Xue Aug 2020

Research On Space Environment Simulation Technology Based On Mobile Platform, Xiaofei Hu, Zhou Yang, Pengfei Li, Jiwei Xu, Xianguang Xue

Journal of System Simulation

Abstract: Based on the study of the spatial visualized simulation, a novel visualized simulation technology of spatial objects built on mobile platform was developed. Critical technologies include the organization, scheduling and mapping with the background of 3D starry sky, calculation and visualized simulation of spacecraft orbit, and storage, organization, dynamic scenario-based updated rendering of 3D digital earth mega geographic data. A fractionized tile algorithm covering the scope of screen was proposed. Projection ranged on the screen was taken as the criteria of fractionation of tiles in the algorithm. Testing results show that the fractionation is correct. Spatial simulation system …

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