Open Access. Powered by Scholars. Published by Universities.®

Numerical Analysis and Scientific Computing Commons™

Open Access. Powered by Scholars. Published by Universities.®

6,717 Full-Text Articles 15,343 Authors 3,274,408 Downloads 148 Institutions

All Articles in Numerical Analysis and Scientific Computing

Faceted Search

6,717 full-text articles. Page 142 of 317.

Advances In Research And Application Of In-Situ Visualization, Wang Fang, Sikun Li, Zhao Dan, Zeng Liang 2020 1. School of Computer, National University of Defense Technology, Changsha 410073, China;;2. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;

Advances In Research And Application Of In-Situ Visualization, Wang Fang, Sikun Li, Zhao Dan, Zeng Liang

Journal of System Simulation

Abstract: Scientific-Visualization is the most effective means of analyzing numerical simulation data. With the continuous improvement of the high performance computing technology, numerical simulation scale is growing rapidly. It is very difficult to analyze large scale parallel numerical simulation data efficiently due to the limits of IO bandwidth, storage system capacity and post processing pattern of visualization. In-situ visualization utilized the same computer system that ran the simulation tasks to operate visual computing and rendering, so it could overcome the limits of IO and storage system. The advances of in-situ visualization in recent years were reviewed, including data management, large-scale …


Sparse Representation Based Private Face Recognition In The Cloud, Liu Yan, Jin Xin, Zhao Geng, Xiaodong Li, Yingya Chen, Guo Kui 2020 1.Beijing Electronic Science and Technology Institute, Beijing 100070, China;;2.Xidian University, Xi'an 710071, China;

Sparse Representation Based Private Face Recognition In The Cloud, Liu Yan, Jin Xin, Zhao Geng, Xiaodong Li, Yingya Chen, Guo Kui

Journal of System Simulation

Abstract: In order to protect user privacy, identification computing of user facial image data in the cloud was accomplished, the sparse representation based private face recognition method in the cloud was proposed. Terminal users collected face images and compared with face images in cloud database and then determined whether faces the terminal acquired belonged to the cloud face database, but both could not achieve each other's face image content. The method processed face images in database and cloud into sparse representation via a third-party terminal, then using Paillier and oblivious transfer homomorphic encryption algorithm to contrast sparse representation coefficient vector …


Design And Realization Of Optimization System For Rice Type, Weilong Ding, Lifeng Xu, Wei Yang, Gao Nan 2020 College of Computer Science & Technology, Zhejiang University of Technology, Hangzhou 310023, China;

Design And Realization Of Optimization System For Rice Type, Weilong Ding, Lifeng Xu, Wei Yang, Gao Nan

Journal of System Simulation

Abstract: It is widely accepted that in traditional crop ideotype breeding, field trials are time-consuming, yet lacking appropriate ways to evaluate the target morphology to be optimal. In order to obtain ideal crop plant type quickly and automatically, meanwhile to reduce the side effects caused by manual operations in the processes of plant type design, e.g. the growing of labor costs and uncertainty of the outcome, a method based on genetic algorithms (GAs) and functional-structural plant model (FSPM) was proposed in this study to optimize plant type of virtual rice by dynamically adjusting phenotypical traits of rice plants. Based on …


3d Reconstruction Of Weak Texture Image Based On Tensor Voting And Dense Map Method, Mingwei Chen, Yang Yang 2020 1. Kunming University of Science and Technology, Kunming 650500, China;;

3d Reconstruction Of Weak Texture Image Based On Tensor Voting And Dense Map Method, Mingwei Chen, Yang Yang

Journal of System Simulation

Abstract: Image based 3D reconstruction method can't effectively detect and match feature points and can't robustly expand 3D point cloud in weak texture image region, due to the fact that weak texture has single color and local reflection phenomenon. It is possible to produce model hole and a large number of 3D noise points, and affect the accuracy and integrity of 3D reconstruction. Slack variables constraint was used to filter mismatch features optimizing the camera matrix, in the dense point cloud expansion stage by using tensor voting principle to filter noise 3d point which is inconsistent with three-dimensional point's normal …


Snow-Albedo Feedback In Northern Alaska: How Vegetation Influences Snowmelt, Lucas C. Reckhaus 2020 CUNY Hunter College

Snow-Albedo Feedback In Northern Alaska: How Vegetation Influences Snowmelt, Lucas C. Reckhaus

Theses and Dissertations

This paper investigates how the snow-albedo feedback mechanism of the arctic is changing in response to rising climate temperatures. Specifically, the interplay of vegetation and snowmelt, and how these two variables can be correlated. This has the potential to refine climate modelling of the spring transition season. Research was conducted at the ecoregion scale in northern Alaska from 2000 to 2020. Each ecoregion is defined by distinct topographic and ecological conditions, allowing for meaningful contrast between the patterns of spring albedo transition across surface conditions and vegetation types. The five most northerly ecoregions of Alaska are chosen as they encompass …


Iot-Enabled Eldercare Technology, Watchanan Chantapakul 2020 Syracuse University

Iot-Enabled Eldercare Technology, Watchanan Chantapakul

International Programs

The world’s population is changing as people are growing older. Leveraging technology for eldercare is important in this century. It can enable many eldercare applications effectively.


Hail Detection Using Dual Polarization Weather Radar, Alfonso Ladino Rincon 2020 Syracuse University

Hail Detection Using Dual Polarization Weather Radar, Alfonso Ladino Rincon

International Programs

This poster highlights how active remote sensors such as weather radar are completely useful for hail detection given its feature and the information they produce. Hail detection is already well studied by the atmospheric scientific community and dual polarimetric variables values for hail signature are presented according to those advances. Then, a supervised classification technique is showed to illustrated how machine learning can be integrated to radar information for automatic hail detection. However, this fuzzy logic algorithm has the capability to distinguish between meteorological and non-meteorological echoes. This automatic information might help forecasters from National Weather Services – NWS to …


Using High-Performance Computing Profilers To Understand The Performance Of Graph Algorithms, Costain Nachuma 2020 LSU New Orleans

Using High-Performance Computing Profilers To Understand The Performance Of Graph Algorithms, Costain Nachuma

LSU New Orleans Theses and Dissertations

An algorithm designer working with parallel computing systems should know how the characteristics of their implemented algorithm affects various performance aspects of their parallel program. It would be beneficial to these designers if each algorithm came with a specific set of standards that identified which algorithms worked better for a specified system. Therefore, the goal of this paper is to take implementations of four graphing algorithms, extract their features such as memory consumption, scalability using profilers (Vtunes /Tau) to determine which algorithms work to their fullest potential in one of the three systems: GPU, shared memory system, or distributed memory …


Synthetic Aperture Radar Signal Simulation Of Ships On Sea Surface, Guijie Diao, Xiaojian Xu, Ni Hong, Junjie Lu 2020 1. Beijing Electro-mechanical Engineering Institute, Beijing 100074, China;;

Synthetic Aperture Radar Signal Simulation Of Ships On Sea Surface, Guijie Diao, Xiaojian Xu, Ni Hong, Junjie Lu

Journal of System Simulation

Abstract: A synthetic aperture radar (SAR) signal simulation method for ship targets on sea surface was proposed and the SAR signature model was established. The ship six degrees freedom motion model, the sea surface complex reflection coefficient model and the target electromagnetic scattering model were introduced. Based on the high frequency electromagnetic scattering calculation method and multi-path electromagnetic scattering, the electromagnetic coupling scattering and the time-varying characteristics were simulated. By comparing and analyzing the imaging results of the simulated SAR signal in different states, the physical scattering characteristics of ship targets on sea surface was realistically reflected, at the same …


Discrete-Event Simulation-Engine Technology Based On Mailbox-Mechanism In C4Isr System, Wendi Cheng, Fengxin Sun, Chu Wei 2020 1. The 28th Research Institute of China Electronic Group Corporation, Nanjing 210007, China;;2. Science and Technology on Information Systems Engineering Laboratory, Nanjing 210007, China;

Discrete-Event Simulation-Engine Technology Based On Mailbox-Mechanism In C4Isr System, Wendi Cheng, Fengxin Sun, Chu Wei

Journal of System Simulation

Abstract: For the design of discrete event simulation engine about combat simulation platform tools in C4ISR System, discrete events were divided into several types according to the C4ISR System's functional components and operational deduction process. The advantage of centralized management and convenient access was made use of by the mechanism of sending and receiving emails in mailbox to support the circulation of discrete events. Besides, the fixed-step driven and event-driven discrete event engine strategies were compared and analyzed. The result shows that, discrete event-driven clock algorithm, which can greatly reduce the consumed machine-time in simulation, is more applicable at …


Semi-Physical Simulation System Research For Marine Fuel Oil Purifier, Zhang Ning, Zhipeng Shen, Jizhong Liu, Haiwei Wang 2020 1. School of Foreign Languages, Dalian Maritime Univ., Dalian 116026, China;;

Semi-Physical Simulation System Research For Marine Fuel Oil Purifier, Zhang Ning, Zhipeng Shen, Jizhong Liu, Haiwei Wang

Journal of System Simulation

Abstract: Practical training in ship fuel oil purifier systems have lots of limitations including poor stability, development difficulties and high maintenance cost. A semi-physical simulation system for marine fuel oil purifier was proposed. According to the real ship control box, a fuel oil purifier control box was designed. A process simulation system was developed to simulate the fuel oil tube and purifier function, which could achieve the working process of purifier system and the phenomenon of fault alarm. The simulation system can reappear the working process of the oil purifier and simulate the fault conditions to improve the …


Mufti-Model Soft Modeling Based On Clustering In Evaporation Process, Peng Chen, Xiaoshan Qian 2020 1. She Wai School, Central South University of Forestry and Technology, Changsha 410004, China;;

Mufti-Model Soft Modeling Based On Clustering In Evaporation Process, Peng Chen, Xiaoshan Qian

Journal of System Simulation

Abstract: Based on the idea approach based on multi-model with a stronger robustness and precision, combining with strong coupling and the highly nonlinear characteristics in multi-effect evaporation process, a soft sensor modeling method of fuzzy kernel clustering was proposed based on differential evolution and multi-squares support vector machines. The method made clustering samples under different conditions by use of DE-KFCM, each sub-models were constructed using LSSVM using fuzzy clustering algorithm to cluster the input data under different conditions, and finally get the system output by weighting. Taking alumina evaporation process as an example, for the soft sensor modeling of export …


Calculation Of Vessel's Geometric Properties Based On Stl Model, Chunlei Liu, Yin Yong, Xiaofeng Sun, Xiufeng Zhang 2020 Navigation College, Dalian Maritime University, Dalian 116026, China;

Calculation Of Vessel's Geometric Properties Based On Stl Model, Chunlei Liu, Yin Yong, Xiaofeng Sun, Xiufeng Zhang

Journal of System Simulation

Abstract: To improve the accuracy of the ship geometric properties calculation and the real-performance of the program, a method based on STL triangular mesh model was proposed to calculate the ship geometric properties. SH polygon clipping algorithm in computer graphics was used to calculate the intersection of ship and water plane. By using of coordinates systems affine transformation, 3D water plane was changed to 2D plane to extract the profile contour. Because the waterlines are monotone polygon, Mass center insertion method was proposed to finish polygon triangulation, computing speed was improved. Bulk carrier "Taihang 128" was taken as an …


Salient Region Detection Based On Object-Biased Gaussian Refinement And Global Contrast, Cai Qiang, Ziyu Xue, Dianhui Mao, Haisheng Li 2020 1. School of Computer and Information Engineering, Beijing Technology and Business University, Beijing 100048, China;;2. Beijing Key Laboratory of Big Data Technology for Food Safety, Beijing Technology and Business University, Beijing 100048, China;

Salient Region Detection Based On Object-Biased Gaussian Refinement And Global Contrast, Cai Qiang, Ziyu Xue, Dianhui Mao, Haisheng Li

Journal of System Simulation

Abstract: In view of the disadvantages such as the incomplete detection in image boundary which is caused by the global contrast significance detection algorithm, a visual saliency detection algorithm was proposed named salient region detection based on object-biased Gaussian refinement and global contrast. After segmentation based on graph, the global contrast was used to calculate the saliency value of each segmentation blocks. According to the location of the salient object, the center of the Gaussian model was adjusted. Both saliency detection value and Gaussian model combined effect of the final saliency values. The method paid attention to the …


Research On 3d Airway Trees Segmentation And Centerline Extraction Algorithm, Yanbo Li, Yu Xiang 2020 College of Computer Science and Technology. Heilongjiang Institute of Technology, Harbin 150050, China;

Research On 3d Airway Trees Segmentation And Centerline Extraction Algorithm, Yanbo Li, Yu Xiang

Journal of System Simulation

Abstract: Centerline extraction plays an important role in virtual bronchology. Organ segmentation and centerline extraction with correct topology structure is very difficult, especially for multiple branching structure organs. Therefore, a 3D airway tree segmentation and centerline extraction algorithm was proposed. A new region growing method was proposed to extract the main branch and sub-branch. The initial center was extracted based on the relationship of adjacent section. The center was corrected by computing the value of the determinant of Jacobian matrix, and the path with all the points was generated by Dijkstra's shortest path algorithm. The experimental results show that …


Molecular Dynamics Of Fluid Properties By Spanwise Oscillations Of Solid Wall, Haijun Dong, Xiaoqing Lu, Haopeng Zhang, Mingming Shan 2020 School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China;

Molecular Dynamics Of Fluid Properties By Spanwise 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 spanwise oscillation were studied using the molecular dynamics method. The three dimensional Couette flow model which was 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 …


Research Of Diffusion-Based Molecular Oscillation And Synchronization In Nanonetworks, Feiyan Li, Lin Lin, Shiwei Ma 2020 School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200072, China;

Research Of Diffusion-Based Molecular Oscillation And Synchronization In Nanonetworks, Feiyan Li, Lin Lin, Shiwei Ma

Journal of System Simulation

Abstract: Nanonetworks, the interconnection among nanomachines at nanoscale, is a novel kind of communication and information sharing interdisciplinary technology, and have huge potential prospects in the application of biomedical engineering, environmental monitoring, industrial production and military. Nanomachine is considered to be the basic functional unit, and clock period caused by oscillators is a prerequisite for nanomachines to work. A mathematical model was developed to describe the molecular diffusion characteristics giving the oscillation period expression by theoretical deviation. Research on oscillation and synchronization in nanonetworks is very limited so far, so the study is of great significance to the development and …


Mathematical Model Of Maneuvering Motion And Virtual Simulation For Ultra Large Twin-Propeller Twin-Rudder Ship, Guo Chen, Yan Lifei, Haiqing Shen 2020 Institute of Ship Automation and Simulator, Dalian Maritime University, Dalian 116026;

Mathematical Model Of Maneuvering Motion And Virtual Simulation For Ultra Large Twin-Propeller Twin-Rudder Ship, Guo Chen, Yan Lifei, Haiqing Shen

Journal of System Simulation

Abstract: A three-degree freedom mathematical model of maneuvering motion for an ultra-large type container ship with twin-propeller twin-rudder is established, with turning circle test and zig-zig test simulation results to verify it. By abstracting the ship maneuvering process, the three-dimensional model of ship, helm, propeller and rudder are modeled according to virtual reality technology, and then the ship posture and the dynamic process of ship maneuvering are displayed by the virtual scene and the responsive three-dimensional model. A virtual simulation system for the maneuvering of ultra large twin-propeller twin-rudder ship is established by the MFC framework and the …


Graphic Method To Simulate Planar Arrays Pattern, Shuchun Zhang, Yongbin Qiu, Jiang Wei, Wei Xin 2020 Air Force Harbin Flight Academy Flight Simulation Technology Institute, Harbin 150001, China;

Graphic Method To Simulate Planar Arrays Pattern, Shuchun Zhang, Yongbin Qiu, Jiang Wei, Wei Xin

Journal of System Simulation

Abstract: Calculating planar arrays pattern is time-consuming in flight simulation whose frame synchronization time is within tens of milliseconds and this would cause removing frames. To resolve this problem, a graphic simulation method was presented to simulate planar arrays' pattern. Based on analyzing ideal patterns' graphic characteristics, a kernel function was constructed whose graphics could reflect all those pattern's characteristics. Then this kernel's graphics being used as a section plane were rotated in the spatial coordinates to match the ideal pattern. The simulation results show that this method can be rapidly calculated and the simulated pattern is highly true to …


3d Trajectory Tracking Of Px4 Quadrotor Based On Improved Dynamic Inversion, Yueli Hu, Weiping Cai, Wenrong Yang 2020 1. College of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200072, China;;2. Microelectronic Research and Development Center, Shanghai University, Shanghai 200072, China;

3d Trajectory Tracking Of Px4 Quadrotor Based On Improved Dynamic Inversion, Yueli Hu, Weiping Cai, Wenrong Yang

Journal of System Simulation

Abstract: An improved dynamic inversion method was proposed for the underactuation and strong coupling in attitude variables of the quadrotors, namely, combining model reference adaptive control (MRAC) with dynamic inversion in the fast variable loop in the system. Through the establishment of dynamic model of the quadrotor and motor model, the control law of the attitude angle and position was deduced. The MATLAB simulation for the scheme was analysed and compared with conventional dynamic inversion, and also simulated in the situation that tracking a given tracjectory with a 10% weight reduction from it's load. Simulation with respect to both …


Digital Commons powered by bepress