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检索条件"机构=Dept. of Computational Modeling and Simulation Engineering"

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FAULT TOLERANT VARIANTS OF THE FINE-GRAINED PARALLEL INCOMPLETE LU FACTORIZATION 17

FAULT TOLERANT VARIANTS OF THE FINE-GRAINED PARALLEL INCOMPL...

引用

simulation Multiconference

作者： Evan Coleman Masha Sosonkina Edmond Chow Naval Surface Warfare Center Dahlgren Division Dept. of Modeling Simulation and Visualization Engineering Old Dominion University School of Computational Science and Engineering Georgia Institute of Technology

ISBN: (纸本)9781510838222

This paper presents an investigation into fault tolerance for the fine-grained parallel algorithm for computing an incomplete LU factorization. Results concerning the convergence of the algorithm with respect to the occurrence of faults, and the impact of any sub-optimality in the produced incomplete factors in Krylov subspace solvers are given. Numerical tests show that the simple algorithmic changes suggested here can ensure convergence of the fine-grained parallel incomplete factorization, and improve the performance of the use of the resulting factors as preconditioners in Krylov subspace solvers if faults do occur.

关键词： Fault tolerance Parallel preconditioning Incomplete factorization GPU acceleration Fault tolerance factorization Lutetium Converge faults Solvers Subspace

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A Strategy for Simulating and Validating the Nuss Procedure for the Minimally Invasive Correction of Pectus Excavatum

A Strategy for Simulating and Validating the Nuss Procedure ...

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2011 4th International Conference on Biomedical engineering and Informatics(第四届生物医学工程与信息学国际会议 BMEI 2011)

作者： Krzysztof J. Rechowicz Frederic D. McKenzie Modeling Simulation & Visualization Engineering Dept. Old Dominion University Norfolk VA USA

Surgical planners are used to achieve the optimal outcome for surgery. They are especially desired in procedures where a positive aesthetic outcome is the primary goal, such as the Nuss procedure which is a minimally invasive surgery for correcting pectus excavatum (PE) - a congenital chest wall deformity. Although this procedure is routinely performed, the outcome depends mostly on the correct placement of the bar. It would be beneficial if a surgeon had a chance to practice and review possible strategies for placement of the corrective bar and the associated appearance of the chest. Therefore, we propose a strategy for the development of a Nuss procedure surgical trainer and planner, taking into account the biomechanical properties of the PE ribcage, emerging trends in surgical planners, deformable models, and visualization techniques. Additionally, we present the initial results of before and after surgery surface scans analysis as a means to validate results, comparison of an average chest shape with post-operative to quantify the outcome of the surgery, and the hardware setup of the simulator.

关键词： Pectus excavatum surgical simulator haptics

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Whitening 1/f-type noise in electroencephalogram signals for steady-state visual evoked potential brain-computer interfaces

Whitening 1/f-type noise in electroencephalogram signals for...

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Asilomar Conference on Signals, Systems & Computers

作者： Alan Paris Azadeh Vosoughi George Atia Modeling and Simulation Program Dept. of Electrical Engineering and Computer Science University of Central Florida

A method is proposed to whiten 1-f-type background noise in electroencephalogram data by a nonlinear spectral transformation from the frequency domain to a newly-defined ∝-pitch domain. Based on the α-pitch spectra of steady-state visual evoked potentials, an algorithm called octave-averaged spectral rectification is applied which simultaneously attenuates 1-f noise while enhancing resonance peaks. This has important potential benefits for gamma-band brain-computer interfaces.

关键词： Decision support systems Visualization Noise

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Tracking blade tip vortices for numerical flow simulations of hovering rotorcraft

Tracking blade tip vortices for numerical flow simulations o...

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AIAA Aerospace Sciences Meeting, 2018

作者： Kao, David L. Smith, Katherine L. Liu, Zhanping Division NASA Ames Research Center Moffett FieldCA94035 United States Dept. of Mathematics Old Dominion University NorfolkVA23529 United States Dept. of Modeling Simulation and Visualization Engineering Old Dominion University NorfolkVA23529 United States

ISBN: (数字)9781624105241

ISBN: (纸本)9781624105241

Blade tip vortices generated by a helicopter rotor blade are a major source of rotor noise and airframe vibration. The noise and vibration occur when a vortex passes close to, and interacts with, a rotor blade. Accurate prediction of Blade Vortex Interaction (BVI) remains a challenge for computational Fluid Dynamics (CFD). Although considerable research has been devoted to BVI noise reduction and experimental techniques for measuring the blade tip vortices in a wind tunnel, there are only a handful of post-processing tools available for extracting vortex core lines from CFD simulation data. In order to obtain the vortex core radius, most of these tools require the user to manually select a vortex core to perform the calculation. Furthermore, none of these tools provide an ability to track the growth of a vortex core, which is a measure of how quickly the vortex diffuses over time. This paper introduces an automated approach for tracking the core growth of a blade tip vortex from CFD simulations of rotorcraft in hover. The proposed method enables effective quantification and visualization of blade tip vortices in helicopter rotor wakes. © 2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Vortex flow

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OAM+: An assembly data model for legacy systems engineering

OAM+: An assembly data model for legacy systems engineering

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33rd Design Automation Conference, presented at - 2007 ASME International Design engineering Technical Conferences and Computers and Information in engineering Conference, IDETC/CIE2007

作者： Manbub Murshed, S.M. Shah, Jami J. Jagasivamani, Vadivel Wasfy, Ayman Hislop, David W. Dept. of Mechanical and Aerospace Engg. Ira. Fulton School of Engineering Arizona State University Tempe AZ 85281 United States Virtual Parts Modeling and Simulation School of Engineering Hampton University Hampton VA 23668 United States

ISBN: (纸本)0791848078

This paper presents a new assembly model named open assembly model plus (OAM+) to support legacy systems engineering (LSE). LSE is a collection of technologies for prolonging the life of old mechanical systems. Rapid Re-engineering System (RRES), a subsystem of LSE is geared towards the fast production of redesigned parts customized to the manufacturing capability available. RRES requires the extraction of initial part geometry, parameters, interfacing constraints, kinematic constraints, and technical function. These specifications need to be imprinted on the CAD model before iterative redesign. A CAD data model is needed that can carry all the functional constraints. A detailed comparison of all the available assembly model shows that none of them can provide all these requirements in one place. Assembly feature based, object oriented assembly model OAM+ is developed to meet these requirements in one model. OAM+ can be used to perform kinematic analysis, force analysis and can exchange feature data using N-Rep feature definition language between different modules of RRES. OAM+ is based on part and assembly features in N-Rep. Copyright © 2007 by ASME.

关键词： Computer aided design

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Developing clinically relevant aspects of the nuss procedure surgical simulator

Developing clinically relevant aspects of the nuss procedure...

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21st Medicine Meets Virtual Reality Conference, NextMed/MMVR 2014

作者： Chemlal, Salim Rechowicz, Krzysztof J. Obeid, Mohammad F. Kelly, Robert E. Mckenzie, Frederic D. Dept. of Electrical and Computer Eng Old Dominion University United States Dept. of Modeling Simulation and Visualization Engineering Old Dominion University Norfolk VA 23529 United States Pediatric Surgery Children's Hospital of the King's Daughters and Eastern Virginia Medical School United States

ISBN: (纸本)9781614993742

Surgical simulators can avail minimizing the risk of surgery and help achieving a better outcome. This is also the case for the Nuss procedure, a minimally invasive surgery for correcting pectus excavatum (PE)-A congenital chest wall deformity. A simulator can be of great benefit if it provides realistic behavior and representation of the actual surgery. In this paper, we address various clinical aspects of the procedure for a training simulation, reproducing a virtual model of the patient's thoracic cavity and internal organs with realistic textures, as well as physical behaviors. In addition, a high fidelity haptic force feedback system is constructed to provide the surgeon with a close-to-real sensation while interacting with the virtual model. © 2014 The authors and IOS Press. All rights reserved.

关键词： Simulators

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modeling boundary conditions in high-order, nodal, time-domain finite element methods 23

Modeling boundary conditions in high-order, nodal, time-doma...

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23rd International Congress on Acoustics: Integrating 4th EAA Euroregio, ICA 2019

作者： Pind, Finnur Jeong, Cheol-Ho Hesthaven, Jan S. Engsig-Karup, Allan P. Strømann-Andersen, Jakob Henning Larsen Denmark Acoustic Technology Dept. of Electrical Engineering Technical University of Denmark Denmark Chair of Computational Mathematics and Simulation Science École polytechnique fédérale de Lausanne Switzerland Scientific Computing Dept. of Applied Mathematics and Computer Science Technical University of Denmark Denmark

ISBN: (纸本)9783939296157

Accurate modeling of boundary conditions is an important aspect in room acoustic simulations. It has been shown that the acoustics of rooms is not only dependent on the frequency characteristic of the complex boundary impedance, but also on the angle dependent properties of the impedance ("extended reaction"). This paper presents a computationally efficient method for modeling local-reaction (LR) and extended-reaction (ER) boundary conditions in high-order, nodal, time-domain finite element methods, such as the spectral element method (SEM) or the discontinuous Galerkin finite element method (DGFEM). The frequency and angle dependent boundary impedance is mapped to a multipole model and formulated in differential form. The solution of the boundary differential equations comes with minimal computational cost. In the ER model, wave splitting is applied at the boundary to separate the incident and reflected parts of the sound field. The directional properties of the incident sound field are determined from the incident particle velocity and the boundary conditions are adjusted continuously according to the wave angle of incidence. The accuracy of the boundary condition model is assessed by comparing simulations against measurements, where a significantly improved match between simulations and measurements is found when the ER model is used. © 2019 Proceedings of the International Congress on Acoustics. All rights reserved.

关键词： *fpin@ Extended-reaction High-order numerical methods Sound absorption Wave-based room acoustic simulations

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An Architecture to Support Integrated Manikin-Based simulations 15

An Architecture to Support Integrated Manikin-Based Simulati...

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simulation Multiconference

作者： James F. Leathrum, Jr. Roland R. Mielke Michel Audette Frederick McKenzie Robert K. Armstrong Geoffrey T. Miller Andrew E. Cross Mark W. Scerbo Dept. of Modeling Simulation and Visualization Engineering Old Dominion University Sentara Center for Simulation and Immersive Learning Eastern Virginia Medical School Dept. of Psychology Old Dominion University

ISBN: (纸本)9781510810594

A radically new approach to the design and implementation of high-technology, computer-driven manikin-based simulation environments for medical training is proposed. The approach utilizes a novel, component-based manikin hardware architecture currently under research for the U.S. military. A new distributed software architecture is proposed in this paper that facilitates interoperability among manikin components and provides the potential to easily integrate other real or virtual devices normally present in a real medical facility.

关键词： Manikin-based training Medical training environment simulation architecture System interoperability Manikins ARCHITECTURE Building construction Integrate Interoperability simulating medical facility Distributed software hardware architecture Real number Medical Education

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Broadband noise predictions for an airfoil in a turbulent stream

Broadband noise predictions for an airfoil in a turbulent st...

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41st Aerospace Sciences Meeting and Exhibit 2003

作者： Casper, J. Farassat, F. Mish, P.F. Devenport, W.J. NASA Langley Research Center Computational Modeling and Simulation Branch Hampton VA United States NASA Langley Research Center Aeroacoustics Branch Hampton VA United States Virginia Polytechnic Institute and State University Aerospace and Ocean Engineering Dept Blacksburg VA United States

ISBN: (纸本)9781624100994

Loading noise is predicted from unsteady surface pressure measurements on a NACA 0015 airfoil immersed in grid-generated turbulence. The timedependent pressure is obtained from an array of synchronized transducers on the airfoil surface. Far field noise is predicted by using the time-dependent surface pressure as input to Formulation 1A of Farassat, a solution of the Ffowcs Williams - Hawkings equation. Acoustic predictions are performed with and without the effects of airfoil surface curvature. Scaling rules are developed to compare the present far field predictions with acoustic measurements that are available in the literature. © protection in the United States.

关键词： Airfoils

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Tsunami risk and vulnerability analysis for the city of rhodes

Tsunami risk and vulnerability analysis for the city of rhod...

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22nd International Offshore and Polar engineering Conference, ISOPE-2012

作者： Flouri, Evangelia T. Mitsoudis, Dimitrios A. Chrysoulakis, Nektarios Synolakis, Costas E. Institute of Applied and Computational Mathematics FORTH Heraklion Greece Dept. of Environmental Engineering Technical Univ. of Crete Chania Crete Greece Archimedes Center for Modeling Analysis and Computation Dept. of Applied Mathematics Univ. of Crete Heraklion Crete Greece Hellenic Center for Marine Research Anavyssos Greece Dept. of Civil Engineering University of Southern California Los Angeles United States

ISBN: (纸本)9781880653944

The authors present a vulnerability and risk analysis of tsunami hazard for the city of Rhodes. The tsunami hazard is assessed through computed values of the maximum inundation and maximum flow dept. derived from a probabilistic scenario for a 1000-year time window, which incorporates hundreds of numerical simulations with MOST code. The data needed to identify tsunami vulnerable areas are gathered combining remote sensing techniques and GIS technology with surveyed observations and estimates of population data. Tsunami risk zones are defined on the basis of both estimated maximum inundation and maximum flow dept. data and results are presented using GIS. Copyright © 2012 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Hazards

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