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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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Independent modeling of fluorescence excitation and emission with the finite element method

Independent modeling of fluorescence excitation and emission...

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Biomedical Topical Meeting, BIOMED 2004

作者： Schulz, Ralf B. Peter, Jörg Semmler, Wolfhard Bangerth, Wolfgang Dept. Medical Physics in Radiology German Cancer Research Center Im Neuenheimer Feld 280 Heidelberg69120 Germany Center for Subsurface Modeling Institute for Computational Engineering and Sciences The University of Texas at Austin 201 East 24th Street ACE 5.324 AustinTX78712 United States

Based on the diffusion equation, a parallel FEM system is proposed, describing photon propagation and fluorescence emission using appropriate boundary conditions. Iterative reconstruction methods will benefit from the... 详细信息

ISBN: (纸本)1557527695

关键词： Finite element method

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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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CrossSimON: A novel probabilistic approach to cross-platform online social network simulation 17

CrossSimON: A novel probabilistic approach to cross-platform...

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17th IEEE International Conference on Intelligence and Security Informatics, ISI 2019

作者： Liu, Jinwei Chung, Wingyan Huang, Yifan Toraman, Cagri School of Modeling Simulation and Training University of Central Florida OrlandoFL32826 United States Department of Computer Science Faculty of Engineering University of Hong Kong Pokfulam Hong Kong Hong Kong Dept. of Decision Sciences and Managerial Econ. School of Business Admin. Chinese University of Hong Kong Shatin Hong Kong

ISBN: (纸本)9781728125046

The increasing popularity and diversity of online social networks (OSNs) have attracted more and more people to participate in multiple OSNs. Learning users' behavior and information diffusion across platforms is critical for cyber threat detection, but it is still a challenge due to the surge of users participating in multiple social platforms. Existing research on profile matching requires user identity information to be available, which may not be realistic. Little prior research payed attention to mapping behavioral patterns across platforms. We designed and implemented an efficient two-level probabilistic approach called CrossSimON to mapping user-group behavior across platforms. CrossSimON considers the activity level and network position at both individual user level and group level to correlate activities across social platforms. To evaluate the effectiveness of CrossSimON in modeling social activity across platforms, we conducted experiments on three online social platforms: GitHub, Reddit and Twitter. Our experimental results show that CrossSimON outperformed the Benchmark in 3 out of 5 simulation metrics. CrossSimON achieved better performance in user activity prediction. The research provides new strategy for cross-platform online social network simulation, and new findings on simulating OSNs and predictive analytics for understanding online social network behavior. © 2019 IEEE.

关键词： Mapping

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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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A framework for simulation-based task analysis - The development of a universal task analysis simulation model

A framework for simulation-based task analysis - The develop...

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IEEE International Multi-Disciplinary Conference on Cognitive Methods in Situation Awareness and Decision Support (CogSIMA)

作者： Anastasia Angelopoulou Konstantinos Mykoniatis Waldemar Karwowski Modeling & Simulation Graduate Program University of Central Florida Orlando FL USA Dept. of Industrial Engineering and Management Systems University of Central Florida Orlando FL USA

Over the last decades there has been a growing interest in modeling human performance and analyzing human activity and human operator behavior to improve system design. A variety of tools and approaches which are based on task analysis methods and tools have been proposed. As technology advances and tasks become more demanding, human work changes increasing the need to create new methodologies and tools for task analysis to face the new challenges. The main aim of this research is to develop a new framework and model for simulation of human tasks performed by individuals with varying levels of skills, considering operator workload and human errors. In order to achieve this goal and fill the current gaps, a review of existing task analysis methods and tools is conducted and a model named UTASiMo is proposed. In addition, the Unified modeling Language is used to describe the conceptual model and illustrate the different constructs and concepts included in the model. Finally, we present a case study and a preliminary simulation model designed in AnyLogic TM .

关键词： Unified modeling language Analytical models Training Data models Conferences Decision making Human factors

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An SDN-IoT-based framework for future smart cities: Addressing perspective

arXiv

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arXiv 2020年

作者： Ghosh, Uttam Chatterjee, Pushpita Shetty, Sachin Datta, Raja Department of EECS Vanderbilt University NashvilleTN37235 United States Department of Computational Modeling and Simulation Engineering Old Dominion University SuffolkVA23435 United States Dept. of Electronics and Electrical Communication Engineering Indian Institute of Technology Kharagpur Kharagpur West Bengal721302 India

In smart this cities Chapter has , been a software-defined proposed and discussed. network (SDN)-based It also comprises framework a distributed for future addressing scheme to facilitate the allocation of addresses to devices in the smart city dynamically. The framework is dynamic and modules can be added and omitted by a centralized controlling unit without disturbing the other components of the framework and other modules may be updated accordingly. In the proposed addressing scheme, a new Internet of Things (IoT) device will receive an IP address from one of their existing neighboring peer devices. This allows devices in the city to act as a proxy and generate a set of unique IP addresses from their own IP addresses, which can then be assigned to new (joining) devices;hence, reducing addressing overhead and latency, as well as avoiding the need to send broadcast messages during the address allocation process. Thus, it achieves considerable bandwidth and energy savings for the IoT devices. Copyright © 2020, The Authors. All rights reserved.

关键词： Internet of things

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Process modeling for simulation: Observations and open issues 16

Process modeling for simulation: Observations and open issue...

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simulation Winter Conference

作者： Gerd Wagner Mamadou Seck Frederic McKenzie Department of Informatics Brandenburg University of Technology Cottbus GERMANY Engineering Management & Systems Engineering Old Dominion University Norfolk VA USA Modeling Simulation & Visualization Engineering Dept. Old Dominion University Norfolk VA USA

ISBN: (纸本)9781509044849

We review the state of the art of process modeling for discrete event simulation, make a number of observations and identify a number of issues that have to be tackled for promoting the use of process modeling in simulation. Process models are of particular interest in model-based simulation engineering approaches where the executable simulation model (code) is obtained with the help of textual or visual models. We present an illustrative example of model-based simulation development.

关键词： Unified modeling language computational modeling Object oriented modeling Process modeling Software engineering Programming

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Google COVID-19 community mobility reports: Insights from multi-criteria decision making

arXiv

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arXiv 2020年

作者： da Silva, Gabriela Cavalcante Oliveira, Sabrina Wanner, Elizabeth F. Bezerra, Leonardo C.T. Brazil Postgraduate Program in Mathematical and Computational Modeling CEFET-MG Brazil Computer Engineering Dept. CEFET-MG Brazil Computer Science Group Aston University United Kingdom

Social distancing (SD) has been critical in the fight against the novel coronavirus disease (COVID-19). To aid SD monitoring, many technology companies have made available mobility data, the most prominent example being the community mobility reports (CMR) provided by Google. Given the wide range of research fields that have been drawing insights from CMR data, there has been a rising concern for methodological discussion on how to use them. Indeed, Google recently released their own guidelines, concerning the nature of the place categories and the need for calibrating regional values. In this work, we discuss how measures developed in the field of multi-criteria decision making (MCDM) might benefit researchers analyzing this data. Concretely, we discuss how Pareto dominance and performance measures adopted in MCDM enable the mobility evaluation for (i) multiple categories for a given time period and (ii) multiple categories over multiple time periods. We empirically demonstrate these approaches conducting both a region- and country-level analysis, comparing some of the most relevant outbreak examples from different continents. Copyright © 2020, The Authors. All rights reserved.

关键词： Coronavirus

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Method of Coding Video Flow Segments Containing Motion Objects

Method of Coding Video Flow Segments Containing Motion Objec...

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International Conference on Modern Problems of Radio engineering, Telecommunications and Computer Science

作者： Roman Onyshchenko Volodymyr Barannik Kyrylo Revva Oleh Kulitsa Pavlo Pertsev Mykhailo Bielous Dept. of Information network engineering Kharkov National University of Radio Electronics Kharkiv Ukraine Dept. of Information network engineering National University of Civil Defence of Ukraine Cherkasy Ukraine Dept. of Scientific research department simulation modeling Ivan Kozhedub Kharkiv National Air Force University Kharkiv Ukraine

ISBN: (数字)9798331520564

ISBN: (纸本)9798331520571

This article shows that one of the most important directions in the development of information communication systems (ICS) is the construction of new generations of wireless technologies. Including such a direction is important for the creation of information technology support systems and decision-making for the management of critical infrastructure objects. It is shown that increasing the bit rate of the coded video stream is a relevant area of research. Such an advantage is proposed to be formed on the basis of structural and positional coding of segments of dynamic objects. A model for evaluating the informativeness of a transformant is created based on the fact that it is represented in the spectral space according to an uneven diagonal scheme. The construction of the information technology of the code representation of diagonals in the structural-positional space of transformants is considered.

关键词： Wireless communication Image coding Motion segmentation Redundancy Dynamic range Streaming media Market research Encoding Telecommunications Information technology

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