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Evaluating the applicability of cloud computing enterprises in support of the next generation of modeling and simulation architectures

Evaluating the applicability of cloud computing enterprises ...

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Military modeling and simulation Symposium, MMS 2013, Part of the 2013 Spring simulation Multiconference, SpringSim 2013

作者： Johnson Sr., Harry E. Tolk, Andreas Department of Modeling Simulation and Visualization Engineering Old Dominion University Norfolk VA United States

ISBN: (纸本)9781627480345

Traditional computing employs client/server architectures where the client software can issue service requests to the server. Cloud computing offers the ability to transparently provide computing services remotely to users through the Internet, freeing them of the burdens associated with managing computing resources and facilities. In order to fully exploit the benefits of computing and network progress, the simulation community must identify and resolve the challenges of distributing the next generation of modeling and simulation architectures among cloud computing enterprises.

关键词： Cloud computing

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Development of a simulation model for pedestrian evacuation under fire condition 50

Development of a simulation model for pedestrian evacuation ...

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50th Annual simulation Symposium, ANSS 2017, Part of the 2017 Spring simulation Multi-Conference, SpringSim 2017

作者： Wang, Zhenyu Yang, Hong Zhu, Zelin Department of Modeling Simulation and Visualization Engineering Old Dominion University 4700 Elkhorn Ave NorfolkVA United States

ISBN: (纸本)9781510838208

Understanding pedestrian behavior under emergency conditions is critical for emergency preparedness. However, the high cost associated with field experiments limited the opportunities for exploring large-scale pedestrian behavior under various emergency scenarios. As an alternative, pedestrian modeling and simulation has become increasingly important in emergency studies. An efficient and valid simulation model that can facilitate the analyses and tests of different emergency management plans is still needed. Thus, this study aims to develop an improved simulation model for analyzing pedestrian movement under fire evacuation. The proposed model was built upon conventional social force model but with extended module addressing pedestrian behavior changes. The model was incorporated in simulation under Unity context and verified from different aspects. The proposed model was then applied to a fire evacuation experiment. Comparative experiments were conducted and the simulation results suggest that the proposed model is more appropriate for simulating pedestrian behavior under fire evacuation. ©2017 Society for modeling & simulation International (SCS).

关键词： Simulated annealing

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visualization of event execution in a discrete event system 50

Visualization of event execution in a discrete event system

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50th Annual simulation Symposium, ANSS 2017, Part of the 2017 Spring simulation Multi-Conference, SpringSim 2017

作者： Collins, Samantha C. Gonda, Nathan D. Dumaliang, Lee C. Leathrum, James F. Mielke, Roland R. Department of Modeling Simulation and Visualization Engineering Old Dominion University 5115 Hampton Blvd NorfolkVA United States

ISBN: (纸本)9781510838208

In discrete event simulation development, a large conceptual leap often is made when going from the system model to the simulation implementation. The event model, describing how events are scheduled and executed, is implied rather than explicitly stated. This paper addresses the gap by introducing a new visualization tool based on event graphs. Given an event graph representation of the event model, the tool allows the developer to observe the execution and scheduling of events during simulation execution. The use of the visualization tool encourages students to explicitly consider the event model, thus providing additional insight to the relationship between the model and the implementation. To better support more general discrete event simulation development efforts, including software development and verification and validation activities, future research will consider interfacing the visualization tool with simulation software tools and developing the capability to reverse engineer the event model from an existing simulation. ©2017 Society for modeling & simulation International (SCS).

关键词： visualization

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Towards an anatomical modeling pipeline for simulation and accurate navigation for brain and spine surgery 49

Towards an anatomical modeling pipeline for simulation and a...

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49th Summer Computer simulation Conference, SCSC 2017, Part of the 2017 Summer simulation Multi-Conference, SummerSim 2017

作者： Audette, Michel A. Rashid, Tanweer Ghosh, Shrabani Patel, Nirmal Sultana, Sharmin Department of Modeling Simulation and Visualization Engineering Old Dominion University 4700 Elkhorn Avenue NorfolkVA United States

ISBN: (纸本)9781510838284

This paper summarizes work underway on neurosurgery simulation and navigation, emphasizing anatomical modeling techniques and clinical requirements for simulation. We describe innovations that center on patient-specific anatomical modeling of the brain, including skull base anatomy, and spine. In general, we advocate a model-based approach to segmentation that leverages digital atlases of the anatomy, as well as a discrete deformable contour or surface model which can be deformed to fit patient image data. Furthermore, we proceed in a manner that represents several tissue boundaries at once, whereby a voxelbased functional atlas is expressed as a deformable 2-Simplex multi-surface model. Our research has also endowed the 2-Simplex multi-surface model with shape statistics and shared faces. We also describe innovations on deformable 1-Simplex 3D contour models that have been applied to identifying the intracranial portion of cranial nerves. Innovations on the clinical requirements front relate to the development of neurosurgical ontologies. © 2017 Society for modeling & simulation International (SCS).

关键词： Tissue

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High-performance flow visualization for effective data analysis

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Journal of Flow visualization and Image Processing 2016年第1-2期23卷 41-57页

作者： Liu, Zhanping Moorhead, Robert J. Department of Modeling Simulation and Visualization Engineering Old Dominion University ODU-MSVE 1300 ECSB 4700 Elkhorn Avenue NorfolkVA23529 United States Department of Electrical and Computer Engineering Mississippi State University United States

As data grows at exponential rates toward exa-scale (1018) computing, it is necessary to exploit scientific visualization in the form of a visual, informative, and interactive methodology to help resolve daunting problems arising from a wide variety of disciplines that involve big data analysis. While novel visualization algorithms are investigated for effective as well as efficient exploration of surface and volume flows, there are signs of revisiting sparse geometry-based methods with further improvement, back from dense texture-based approaches, and resorting to parallel visualization. This paper presents our innovative research along this path in high-performance visualization of flow data for exploration, recognition, representation, and analysis of overall patt erns and salient features, with techniques from texture-based to geometry-based, flows from 2D to 3D, complexity from steady to unsteady, and computing from serial to parallel. Specifically, a high-level description is primarily focused on four algorithms, i.e., accelerated unsteady flow line integral convolution, its extension to time-varying volume flows, advanced evenly spaced streamline placement, and interactive view-driven evenly spaced streamline placement. Also introduced are four systems, i.e., ActiveLIC, ActiveIBFV, ActiveFLOVE, and DOXIV, which we developed for high-performance flow visualization coupled with applications to demonstrate the practical applicability. © 2016 by Begell House, Inc.

关键词： Data visualization

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Synthesizing and visualizing symmetric flows

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Journal of Flow visualization and Image Processing 2016年第3-4期23卷 253-273页

There are frequent user studies in flow visualization for comparing different algorithms in the effectiveness. While much work is focused on statistical analysis of the collected results, considerable bias arising from both flow data and task design is seldom addressed, compromising and even invalidating the subsequent conclusion. This paper presents topology-based synthesis of symmetric flows for explicit data generation, which then facilitates implicit task design, so as to enable convincing user studies. This method can produce a large number of (x-/y-/center-)symmetric flows with different structures but with nearly the same degree of topological complexity, and geometrically symmetric yet topologically asymmetric flows. The wide variety of topological constitution requires local + global visual perception, comprehensive feature recognition, and discreet pattern classification to gain a proper understanding of such symmetric and asymmetric flows. To visualize these flows, we propose to use a set of representative techniques including sparse geometry-based methods (i.e., arrow plots and evenly spaced streamlines) and dense texture-based approaches (i.e., three variants of line integral convolution) coupled with two color map schemes (i.e., rainbow band and color wheel). This selection, out of a broad range of candidate techniques, is based on thorough investigation of the working mechanisms, in-depth analysis of perceptual factors, and extensive observation of the advances in flow visualization. Thus, the rationale helps identify strengths and weaknesses of the existing flow visualization methods and provides hints for designing new effective algorithms. © 2016 by Begell House, Inc.

关键词： Flow visualization

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Outcome-based curriculum development for an undergraduate M&S program

Outcome-based curriculum development for an undergraduate M&...

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Education and Training modeling and simulation 2012, ETMS 2012, Part of the 2012 Autumn simulation Multiconference, AutumnSim 2012

作者： Leathrum Jr., James F. Mielke, Roland R. Department of Modeling Simulation and Visualization Engineering Old Dominion University Norfolk VA 23529 United States

ISBN: (纸本)9781622760992

The first undergraduate degree program in modeling and simulation engineering currently is being implemented at Old Dominion University. The program will award the Bachelor of Science in modeling and simulation engineering (BS-M&SE) and is designed to meet the ABET accreditation requirements for general engineering programs. This paper describes the design of an assessment process for evaluating the level of student achievement in the program's student learning outcomes. Several performance measures are defined for each outcome and rubrics for evaluating each performance measure on a four-level scale are presented. Then a curriculum content map is developed and used to associate student outcomes to course content components, identifying outcome coverage by the curriculum.

关键词： Curricula

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A successful EAC-ABET accredited undergraduate program in modeling and simulation engineering (MandSE)

A successful EAC-ABET accredited undergraduate program in mo...

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Winter simulation Conference, WSC 2015

作者： McKenzie, Frederic D. Mielke, Roland R. Leathrum, James F. Department of Modeling Simulation and Visualization Engineering Old Dominion University 4700 Elkhorn Avenue NorfolkVA23529 United States

ISBN: (纸本)9781467397438

The first undergraduate degree program in modeling and simulation engineering recently was implemented at Old Dominion University. The program awards the Bachelor of Science Degree in modeling and simulation engineering and was designed to meet the ABET accreditation requirements for general engineering programs. This paper describes the design and implementation of a continuous improvement process for the program. The department mission statement and the program educational objectives are presented. The student outcomes are stated and an assessment process for evaluating student achievement is described. Finally, the continuous improvement process for the program is presented. Recommendations from the initial ABET accreditation visit are summarized. © 2015 IEEE.

关键词： Accreditation

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Impact of connected vehicles on mitigating secondary crash risk

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International Journal of Transportation Science and Technology 2017年第3期6卷 196-207页

作者： Yang, Hong Wang, Zhenyu Xie, Kun Department of Modeling Simulation & Visualization Engineering Old Dominion University Norfolk 23529 VA United States Department of Civil & Natural Resources Engineering University of Canterbury Christchurch New Zealand

Reducing the risk of secondary crashes is a key goal for effective traffic incident management. However, only few countermeasures have been established in practices to achieve the goal. This is mainly due to the stochastic nature of both primary and secondary crashes. Given the emerging connected vehicle (CV) technologies, it is highly likely that CVs will soon be able to communicate with each other through the ad-hoc wireless vehicular network. Information sharing among vehicles is deemed to change traffic operations and allow motorists for more proactive actions. Motorists who receive safety messages can be motivated to approach queues and incident sites with more caution. As a result of the improved situational awareness, the risk of secondary crashes is expected to be reduced. To examine whether this expectation is achievable or not, this study aims to assess the impact of connectivity on the risk of secondary crashes. A simulation-based modeling framework that enables vehicle-to-vehicle communication module was developed. Since crashes cannot be directly simulated in micro-simulation, the use of surrogate safety measures was proposed to capture vehicular conflicts as a proxy for secondary crash risk upstream of a primary crash site. An experimental study was conducted based on the developed simulation modeling framework. The results show that the use of connected vehicles can be a viable way to reduce the risk of secondary crashes. Their impact is expected to change with an increasing market penetration of connected vehicles. © 2017 Tongji University and Tongji University Press

关键词： Connected vehicles Secondary crashes simulation Traffic conflict Vehicle-to-vehicle communication

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Proposed unified discrete event simulation content roadmap for M&S curricula

Proposed unified discrete event simulation content roadmap f...

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2017 Winter simulation Conference, WSC 2017

作者： Leathrum, James F. Mielke, Roland R. Collins, Andrew J. Audette, Michel A. Department of Modeling Simulation and Visualization Engineering Old Dominion University 1300 Engineering and Computational Sciences Building NorfolkVA23529 United States

ISBN: (纸本)9781538634288

This paper presents a new educational roadmap for teaching discrete event system (DES) simulation software design. This roadmap represents the hierarchical structure and inter-relationships characterizing the worldviews of DES simulation, namely, event scheduling and process interaction. The roadmap was developed from the authors' experience while teaching DES simulation to both undergraduate and graduate students, spanning several years. The roadmap's development was motivated by the need to strive for greater completeness as well as fewer inconsistencies in the material curriculum. The commonality between the worldviews is highlighted in striving for a uniform approach. The intent of this paper is to provide other educators a foundation for their own DES simulation course development. A simple example is used to illustrate the worldviews within the roadmap. © 2017 IEEE.

关键词： Curricula

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