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simulation Multiconference

作者： Mohammad F. Obeid Krzysztof J. Rechowicz Frederic D. McKenzie Dept. of Modeling Simulation and Visualization Engineering Old Dominion University

ISBN: (纸本)9781632667335

Real-time mirror reflection is employed in many virtual reality applications to achieve visuo-haptic collocation. Its use, however, necessitates adjustments to the original model as well any used input devices to compensate for changes due to image reversion. This paper introduces a design and implementation of a generic configuration component for virtual environments that adjusts image characteristics and haptic interfaces to accommodate such setups while preserving the properties and features of the original model. Furthermore, this work executes running multiple display viewports for the same virtual environment synchronously. This work accomplishes a significant step in the development of a surgical simulator for the Nuss Procedure surgery performed to correct Pectus Excavatum, a congenital deformity of the anterior chest wall.

关键词： Virtual environments Haptic devices Displays Simulator Virtual environments simulator DISPLAYING haptic device input equipment original model Haptic interfaces Funnel Chest Anterior chest wall Reflection

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A Mathematical Model for Representing Farmer Decision Processes 14

A Mathematical Model for Representing Farmer Decision Proces...

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Computer simulation Conference

作者： Kasi Bharath Vegesana Frederic D. McKenzie Dept. of Modeling Simulation and Visualization Engineering Old Dominion University

ISBN: (纸本)9781632667335

This paper presents a mathematical modeling technique that allows for formulating a farmer decision problem. We use fuzzy logic and binary integer programming respectively to represent the factors and decision utilities in the problem. We will briefly look at the data requirements for this model. The techniques used in determining the fuzzy rule base will be discussed. We will show the application of artificial neural networks for determining the rule base in our model. A mathematical representation of the system will be created, which can act as an approximation for any problem formulation. Finally, we will use all these techniques on a sample problem, which uses simulated data.

关键词： Decision support system Fuzzy logic Binary integer programming Artificial neural networks

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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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Author Correction: The FLUXNET2015 dataset and the ONEFlux processing pipeline for eddy covariance data

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Scientific data 2021年第1期8卷 72页

作者： Gilberto Pastorello Carlo Trotta Eleonora Canfora Housen Chu Danielle Christianson You-Wei Cheah Cristina Poindexter Jiquan Chen Abdelrahman Elbashandy Marty Humphrey Peter Isaac Diego Polidori Markus Reichstein Alessio Ribeca Catharine van Ingen Nicolas Vuichard Leiming Zhang Brian Amiro Christof Ammann M Altaf Arain Jonas Ardö Timothy Arkebauer Stefan K Arndt Nicola Arriga Marc Aubinet Mika Aurela Dennis Baldocchi Alan Barr Eric Beamesderfer Luca Belelli Marchesini Onil Bergeron Jason Beringer Christian Bernhofer Daniel Berveiller Dave Billesbach Thomas Andrew Black Peter D Blanken Gil Bohrer Julia Boike Paul V Bolstad Damien Bonal Jean-Marc Bonnefond David R Bowling Rosvel Bracho Jason Brodeur Christian Brümmer Nina Buchmann Benoit Burban Sean P Burns Pauline Buysse Peter Cale Mauro Cavagna Pierre Cellier Shiping Chen Isaac Chini Torben R Christensen James Cleverly Alessio Collalti Claudia Consalvo Bruce D Cook David Cook Carole Coursolle Edoardo Cremonese Peter S Curtis Ettore D'Andrea Humberto da Rocha Xiaoqin Dai Kenneth J Davis Bruno De Cinti Agnes de Grandcourt Anne De Ligne Raimundo C De Oliveira Nicolas Delpierre Ankur R Desai Carlos Marcelo Di Bella Paul di Tommasi Han Dolman Francisco Domingo Gang Dong Sabina Dore Pierpaolo Duce Eric Dufrêne Allison Dunn Jiří Dušek Derek Eamus Uwe Eichelmann Hatim Abdalla M ElKhidir Werner Eugster Cacilia M Ewenz Brent Ewers Daniela Famulari Silvano Fares Iris Feigenwinter Andrew Feitz Rasmus Fensholt Gianluca Filippa Marc Fischer John Frank Marta Galvagno Mana Gharun Damiano Gianelle Bert Gielen Beniamino Gioli Anatoly Gitelson Ignacio Goded Mathias Goeckede Allen H Goldstein Christopher M Gough Michael L Goulden Alexander Graf Anne Griebel Carsten Gruening Thomas Grünwald Albin Hammerle Shijie Han Xingguo Han Birger Ulf Hansen Chad Hanson Juha Hatakka Yongtao He Markus Hehn Bernard Heinesch Nina Hinko-Najera Lukas Hörtnagl Lindsay Hutley Andreas Ibrom Hiroki Ikawa Marcin Jackowicz-Korczynski Dalibor Janouš Wilma Jans Rachhpal Jassal Shicheng Jiang Tomomichi Kato Myr Computational Research Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA. gzpastorello@lbl.gov. DIBAF University of Tuscia Viterbo 01100 Italy. Euro-Mediterranean Centre on Climate Change Foundation (CMCC) Lecce 73100 Italy. Climate & Ecosystem Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA. Computational Research Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA. Department of Civil Engineering California State University Sacramento CA 95819 USA. Department of Geography Environment and Spatial Sciences Michigan State University East Lansing MI 48823 USA. Department of Computer Science University of Virginia Charlottesville VA 22904 USA. TERN Ecosystem Processes Menzies Creek VIC3159 Australia. Max Planck Institute for Biogeochemistry Jena 07701 Germany. Laboratoire des Sciences du Climat et de l'Environnement (LSCE) CEA CNRS UVSQ UPSACLAY Gif sur Yvette 91190 France. Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China. Department of Soil Science University of Manitoba Winnipeg MB R3T2N2 Canada. Department of Agroecology and Environment Agroscope Research Institute Zürich 8046 Switzerland. School of Geography and Earth Sciences McMaster University L8S4K1 Hamilton ON Canada. Department of Physical Geography and Ecosystem Science Lund University Lund 22362 Sweden. Department of Agronomy and Horticulture University of Nebraska-Lincoln Lincoln NE 68583 USA. School of Ecosystem and Forest Sciences The University of Melbourne Richmond VIC3121 Australia. Department of Biology Research Group PLECO University of Antwerp Antwerp 2610 Belgium. Joint Research Centre European Commission Ispra 21027 Italy. TERRA Teaching and Research Center University of Liege Gembloux B-5030 Belgium. Finnish Meteorological Institute Helsinki 00560 Finland. ES

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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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Improvement of a virtual pivot for minimally invasive surgery simulators using haptic augmentation

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8678卷 70-79页

作者： Obeid, Mohammad F. Chemlal, Salim Rechowicz, Krzysztof J. Heo, Eun-Sil Kelly, Robert E. McKenzie, Frederic D. Dept. of Modeling Simulation and Visualization Engineering Old Dominion University Norfolk United States Dept. of Electrical and Computer Engineering Old Dominion University Norfolk United States Virginia Modeling Analysis and Simulation Center Old Dominion University Norfolk United States Pediatric Surgery Children’s Hospital of The King’s Daughters and Eastern Virginia Medical School Norfolk United States

With rapid development of minimally invasive surgery, proficiency with intricate skills is becoming a greater concern. Consequently, the use of out-of-operating room training has increased significantly through employing high-fidelity and anatomically-correct graphics and haptic interfaces in virtual reality simulations. The effort in developing surgical simulators for generic minimally invasive procedures is still, however, suboptimal for many haptic implementations. A main aspect of such simulations is the pivoting behavior of the surgical tool realized using the haptic device. This paper investigates the limitation of a fullyvirtual implementation of the pivot and the ability to augment haptic interfaces to achieve a natural representation of forces. The design and implementation of two surgical tool pivoting techniques are introduced. Furthermore, a phantom is constructed from synthesized components to be used to measure and reproduce realistic mechanical properties of the anatomical model and pivot behavior. © Springer International Publishing Switzerland 2014.

关键词： Augmented reality

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Decentralized computation of pareto optimal pure nash equilibria of Boolean games with privacy concerns

Decentralized computation of pareto optimal pure nash equili...

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6th International Conference on Agents and Artificial Intelligence, ICAART 2014

作者： De Clercq, Sofie Bauters, Kim Schockaert, Steven Mihaylov, Mihail De Cock, Martine Nowé, Ann Dept. of Applied Mathematics Computer Science and Statistics Ghent University Ghent Belgium School of Electronics Electrical Engineering and Computer Science Queen's University Belfast United Kingdom School of Computer Science and Informatics Cardiff University Cardiff United Kingdom Computational Modeling Lab Vrije Universiteit Brussel Brussels Belgium

ISBN: (纸本)9789897580161

In Boolean games, agents try to reach a goal formulated as a Boolean formula. These games are attractive because of their compact representations. However, few methods are available to compute the solutions and they are either limited or do not take privacy or communication concerns into account. In this paper we propose the use of an algorithm related to reinforcement learning to address this problem. Our method is decentralized in the sense that agents try to achieve their goals without knowledge of the other agents' goals. We prove that this is a sound method to compute a Pareto optimal pure Nash equilibrium for an interesting class of Boolean games. Experimental results are used to investigate the performance of the algorithm. Copyright © 2014 SCITEPRESS.

关键词： Reinforcement learning

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Exchange of parametric bridge models using a neutral data format

Exchange of parametric bridge models using a neutral data fo...

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作者： Ji, Yang Borrmann, André Beetz, Jakob Obergrießer, Mathias Department of Computational Modeling and Simulation Technische Universität München Arcisstrasse 21 80290 Munich Germany Design Systems Group Eindhoven Univ. of Technology Den Dolech 2 5612 AZ Eindhoven Netherlands Dept. of Construction Informatic Regensburg Univ. of Applied Sciences Prüfeninger Str. 58 93049 Regensburg Germany

Parametric modeling is a well-established methodology in the field of mechanical engineering. It allows for the creation of flexible geometric models using parameters for dimensions and makes it possible to define numeric relationships between these parameters by means of mathematical formulas and define geometric-topological constraints between geometric entities. The result is a flexible geometric model that can be steered through the manipulation of its primary parameters. In contrast to explicit geometric models with fixed dimensions, a parametric model can capture the design intent and represent domain knowledge. The use of parametric modeling techniques is particularly beneficial for designing bridges. This is because the geometric design of bridges is mainly determined by external constraints resulting from the size and the layout of both the overlying and the undercrossing carriageway. This reduces the effort required for reworking when changes are made, while simultaneously providing a high degree of reusability for the model in other, similar projects, resulting in significantly increased efficiency in the bridge design process. Because of the strong fragmentation of the architecture, engineering, and construction (AEC) industry, the data exchange between the different participants in a construction project is of crucial importance. The use of neutral, open data formats has proved to be the most suitable approach to realize this data exchange. However, currently existing neutral data formats do not allow for an exchange of parametric geometry. To overcome these technical limitations, this paper introduces an extension to the IFC-Bridge format, thus providing a means of interchanging parametric bridge models. This article describes in detail the necessary entities introduced to define parameters and capture dimensional and geometric constraints. The suitability of the developed extensions is proved by presenting the successful transfer of parametric bridge

关键词： Electronic data interchange

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Investigation of wing stall delay effect due to an undulating leading edge: An les study 8

Investigation of wing stall delay effect due to an undulatin...

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8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013

作者： Skillen, Alex Revell, Alistair Favier, Julien Pinelli, Alfredo Piomelli, Ugo Computational Fluid Dynamics Group Modelling and Simulation Centre University of Manchester United Kingdom Aix-Marseille Université Marseille13451 France School of Engineering and Mathematical Science City University London United Kingdom Dept. of Mechanical and Materials Engineering Queen's University KingstonONK7L 3N6 Canada

We present LES simulations of the flow over a wing with sinusoidal leading edge undulations. The undulations act as a passive flow control device, offering superior poststall aerodynamic performance relative to the unmodified wing with the same mean chord. The baseline case of a regular wing is also presented for comparison. In all cases the Reynolds number based on bulk velocity and mean chord is equal to 120, 000, and the angle of attack is set to 20°. The study explores the details of the flow physics and the mechanisms by which the post-stall aerodynamic benefit is gained. For the particular set of geometrical and aerodynamic parameters considered, a hitherto unreported physical mechanism by which the undulation offers their benefit is observed. This increased understanding of the flow physics for the current configuration is an important step towards a more general understanding and the incorporation of the technology into practical designs. Potential applications include vertical axis wind turbines, unmanned air vehicles, helicopter blades, and canard surfaces;the present Reynolds number is of particular relevance to the first two of these applications.

关键词： Reynolds number

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Automated personalised human left ventricular FE models to investigate heart failure mechanics

Automated personalised human left ventricular FE models to i...

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3rd International Workshop on Statistical Atlases and computational Models of the Heart: Imaging and Modelling Challenges, STACOM 2012

作者： Wang, Vicky Y. Hoogendoorn, Corné Frangi, Alejandro F. Cowan, B.R. Hunter, Peter J. Young, Alistair A. Nash, Martyn P. Auckland Bioengineering Institute University of Auckland New Zealand Center for Computational Imaging and Simulation Technologies in Biomedicine Dept. of Info. and Communication Tech. Universitat Pompeu Fabra Barcelona Spain Department of Mechanical Engineering University of Sheffield Sheffield United Kingdom Centre for Advanced MRI University of Auckland New Zealand Department of Engineering Science University of Auckland New Zealand

ISBN: (纸本)9783642369605

We have developed finite element modelling techniques to semi-automatically generate personalised biomechanical models of the human left ventricle (LV) based on cardiac magnetic resonance images. Geometric information of the LV throughout the cardiac cycle was derived via semi-automatic segmentation using non-rigid image registration with a pre-segmented image. A reference finite element mechanics model was automatically fitted to the segmented LV endocardial and epicardial surface data at diastasis. Passive and contractile myocardial mechanical properties were then tuned to best match the segmented surface data at end-diastole and end-systole, respectively. Global and regional indices of myocardial mechanics, including muscle fibre stress and extension ratio were then quantified and analysed. This mechanics modelling framework was applied to a healthy human subject and a patient with non-ischaemic heart failure. Comparison of the estimated passive stiffness and maximum activation level between the normal and diseased cases provided some preliminary insight into the changes in myocardial mechanical properties during heart failure. This automated approach enables minimally invasive personalised characterisation of cardiac mechanical function in health and disease. It also has the potential to elucidate the mechanisms of heart failure, and provide new quantitative diagnostic markers and therapeutic strategies for heart failure. © 2013 Springer-Verlag.

关键词： Mechanisms

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