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29th European Conference on Modelling and simulation, ECMS 2015

作者： Ren, Shuo McKenzie, Frederic D. Department of Modeling Simulation and Visualization Engineering NorfolkVA United States

ISBN: (纸本)9780993244001

In recent years, virtual environments have played a key role in engineering education. The use of virtual environments as learning tools continues to grow on account of the capabilities of providing learners with more interactive and immersive learning experiences than most of the conventional learning methods. This paper aims to introduce the related background and recent research work on the topic of the collaborative virtual environment (CVE) and then presents a solution of implementing a web-based 3D virtual engineering laboratory in a collaborative setting. This will allow users to create their own avatars in the virtual world and work collaboratively over the network. Such a method may also be beneficial for distance learning. © ECMS Valeri M. Mladenov, Petia Georgieva, Grisha Spasov, Galidiya Petrova (Editors).

关键词： Virtual reality

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Using simulation games for teaching and learning discrete-event simulation 16

Using simulation games for teaching and learning discrete-ev...

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simulation Winter Conference

作者： Jose J. Padilla Christopher J. Lynch Saikou Y. Diallo Ross J. Gore Anthony Barraco Hamdi Kavak Bakari Jenkins Virginia Modeling Analysis and Simulation Center Old Dominion University Suffolk VA USA Modeling Simulation and Visualization Engineering Dept. Old Dominion University Norfolk VA USA The Pruden Center for Industry and Technology Suffolk VA USA

ISBN: (纸本)9781509044849

Capturing and retaining the attention of students while learning complex topics like modeling and simulation is a critical task. In discrete-event simulation (DES), educators rely on examples like queueing systems in fast food restaurants or manufacturing organizations to provide the necessary context for learning. In many instances, these examples fall short in capturing the attention of students, especially at the middle and high school levels. One approach for learning complex topics, like creating simulations, is through gaming. This paper reports on the creative use of regular simulation tools to develop simulation games with entertainment content aimed towards engaging young learners. Two games are presented: one focuses on the use of decision nodes while the second focuses on the use of batch/separator nodes. As part of future work, we propose to use these games to evaluate how much knowledge transfers from an entertainment context to one using simulations for real-life situations.

关键词： Games Computational modeling Context Urban areas Context modeling Servers

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Backward Dijkstra Algorithms for Finding the Departure Time Based on the Specified Arrival Time for Real-Life Time-Dependent Networks

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Journal of Applied Mathematics and Physics 2016年第1期4卷 1-7页

作者： Gelareh Bakhtyar Vi Nguyen Mecit Cetin Duc Nguyen Department of Civil and Environmental Engineering Old Dominion University Norfolk USA Department of Mechanical and Aerospace Engineering Old Dominion University Norfolk VA USA Department of Modeling Simulation and Visualization Engineering Old Dominion University Norfolk VA USA

A practical transportation problem for finding the “departure” time at “all source nodes” in order to arrive at “some destination nodes” at specified time for both FIFO (i.e., First In First Out) and Non-FIFO “Dynamic ” Networks is considered in this study. Although shortest path (SP) for dynamic networks have been studied/documented by various researchers, contributions from this present work consists of a sparse matrix storage scheme for efficiently storing large scale sparse network’s connectivity, a concept of Time Delay Factor (TDF) combining with a “general piece- wise linear function” to describe the link cost as a function of time for Non-FIFO links’ costs, and Backward Dijkstra SP Algorithm with simple heuristic rules for rejecting unwanted solutions during the backward search algorithm. Both small-scale (academic) networks as well as large- scale (real-life) networks are investigated in this work to explain and validate the proposed dynamic algorithms. Numerical results obtained from this research work have indicated that the newly proposed dynamic algorithm is reliable, and efficient. Based on the numerical results, the calculated departure time at the source node(s), for a given/specified arrival time at the destination node(s), can be non-unique, for some Non-FIFO networks’ connectivity.

关键词： Backward Dijkstra Dynamic Networks Piece-Wise Linear Function Specified Arrival Time

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Optimal maximum likelihood estimates fusion in distributed network of sensors

Optimal maximum likelihood estimates fusion in distributed n...

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IEEE International Conference on Intelligent Computer Communication and Processing (ICCP)

作者： Bharat Madan Doina Bein Dept. of Modeling Simulation & Visualization Engineering Old Dominion University Norfolk USA Department of Computer Science California State University Fullerton Fullerton USA

ISBN: (纸本)9781509039005

A distributed network of sensors leverages its performance by aggregating information gathered by individual sensors through the process of sensor data fusion. Estimating parameters using a centralized scheme entails transporting data from multiple sensors to a centralized fusion center, leading to high network bandwidth consumption. Additionally, fusing raw sensor data from sensors with different sensing modalities may not be feasible. We propose an alternative approach in which each sensor first individually estimates the unknown parameters based solely on its own sensor data. Since sensors may not have a-priori knowledge of the probability distribution of the unknown parameters, each sensor independently computes its individual maximum likelihood estimates. Individual estimates along with their sufficient statistics are then communicated to the fusion center, which treats these estimates as observations to compute the optimum aggregated maximum likelihood estimates by maximizing the new likelihood function of these observations. The proposed technique offers two significant advantages: (i) Since each sensor computes its individual estimates based solely on its own sensed data, it is easily applicable to sensor networks having multi-modal sensors, and (ii) As compared to raw sensor data, communicating estimates and their sufficient statistics to the fusion center requires substantially less network bandwidth. Performance of the aggregated estimates is evaluated through simulations and by computing the Cramer-Rao lower bound.

关键词： Maximum likelihood estimation Sensor fusion Bandwidth Sensor phenomena and characterization Computational modeling

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Java Computer Animation for Effective Learning of the Cholesky Algorithm with Transportation engineering Applications

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Journal of Software engineering and Applications 2016年第10期9卷 491-500页

作者： Ivan Makohon Duc T. Nguyen Mecit Cetin Modeling Simulation & Visualization Engineering (MSVE) Department Old Dominion University Norfolk VA USA CEE and MSVE Department Old Dominion University Norfolk VA USA Civil & Environmental Engineering (CEE) Department Old Dominion University Norfolk VA USA

In this paper, the well-known Cholesky Algorithm (for solving simultaneous linear equations, or SLE) is re-visited, with the ultimate goal of developing a simple, user-friendly, attractive, and useful Java visualization and Animation Graphical User Inter-face (GUI) software as an additional teaching tool for students to learn the Cholesky factorization in a step-by-step fashion with computer voice and animation. A demo video of the Cholesky Decomposition (or factorization) animation and result can be viewed online from the website: http://***/~imako001/cholesky/demo/***. The software tool developed from this work can be used for both students and their instructors not only to master this technical subject, but also to provide a dynamic/valuable tool for obtaining the solutions for homework assignments, class examinations, self-assessment studies, and other coursework related activities. Various transportation engineering applications of SLE are cited. engineering educators who have adopted “flipped classroom instruction” can also utilize this Java visualization and Animation software for students to “self-learning” these algorithms at their own time (and at their preferable locations), and use valuable class-meeting time for more challenging (real-life) problems’ discussions. Statistical data for comparisons of students’ performance with and without using the developed Java computer animation are also included.

关键词： Cholesky Algorithm Shortest Path Linear Programming Traffic Flows Decomposition/Factorization Java visualization/Animation Statistical Data

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Strategies to hide communication for a classical molecular dynamics proxy application 23

Strategies to hide communication for a classical molecular d...

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23rd High Performance Computing Symposium, HPC 2015, Part of the 2015 Spring simulation Multi-Conference, SpringSim 2015

作者： Ngatang, Issakar Sosonkina, Masha Department of Modeling Simulation and Visualization Engineering Old Dominion University NorfolkVA23529 United States

ISBN: (纸本)9781510810600

Co-designing applications and computer architectures has become of major importance due to the growing complexity of both applications and architectures and the need to better match application characteristics to the available hardware. Thus, "mini-applications", which serve as proxies of large-scale ones by highlighting their most intensive parts and major workflow components, appeared to the co-design, tuning, and adaptation purposes. This paper presents a work on optimizing the communication subsystem of a classical MD proxy (CoMD) application executed on multi-core computing clusters. The research focuses on hiding communication with certain buffer handling operations. In particular, two strategies are presented: one that uses two parallel threads for communication and buffer handling and another that introduces more parallelism by allowing all the available threads to unload the buffers while using two thread to communicate, thereby improving load balancing. The first proposed strategy yields performance gains up to 61% in the communication routines, corresponding to 6% gains in the overall time, while the second strategy achieves, respectively, about 73% and 6.3% improvement. Copyright © 2015 Society for modeling & simulation International (SCS).

关键词： Computer architecture

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Optimal crop selection and scheduling using a generic crop growth model and integer programming model 14

Optimal crop selection and scheduling using a generic crop g...

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14th International Conference on modeling and Applied simulation, MAS 2015

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

ISBN: (纸本)9788897999508

Crop growth programs and crop optimizers act as important decision support tools in selecting crops and influencing farmer decision process. However the crop optimizers do not always include the crop growth models while selecting the best possible crops. In this paper we will present the equations used to model a generic crop growth model and couple it with an optimal crop scheduler, to select the best possible sequence of crops. The scheduler aims to achieve various objectives like maximizing performance, maximizing economic gain and minimizing environmental impact. Each objective has three different configurations with regards to the crop rotation and crop growth period. The results will be visualized using a Gantt chart to show the scheduling of the crops.

关键词： Decision support systems

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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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An agent based model to simulate farmer decision process

An agent based model to simulate farmer decision process

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Agent-Directed simulation Symposium, ADS 2015, Part of the 2015 Spring simulation Multi-Conference, SpringSim 2015

作者： Vegesana, Kasi Bharath McKenzie, Frederic D Dept. of Modeling Simulation and Visualization Engineering Old Dominion University NorfolkVA23529 United States

ISBN: (纸本)9781510810600

This paper presents an implementation of a mathematical model for simulating farmer decision processes. It is an Agent Based process that utilizes 'IF - THEN' rules in a Fuzzy Logic System, and integer programming. This model was applied on Farm Accountancy and Data Network (FADN) data for Piedmonte, Italy. We will examine the design process in detail, and evaluate our initial results. Finally, we will discuss limitations and future applications of the model. Copyright ©2015 Society for modeling & simulation International (SCS).

关键词： Fuzzy logic

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Contour models for descriptive patient-specific neuro-anatomical modeling: Towards a digital brainstem atlas 2

Contour models for descriptive patient-specific neuro-anatom...

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2nd Workshop on Computational Methods and Clinical Applications for Spine Imaging, CSI 2014 held in conjunction with MICCAI 2014

作者： Patel, Nirmal Sultana, Sharmin Audette, Michel A. Department of Electrical and Computer Engineering Old Dominion University Norfolk United States Department of Modeling Simulation and Visualization Engineering Old Dominion University Norfolk United States

ISBN: (纸本)9783319141473

This paper describes on-going work on the transposition to digital format of 2D images of a printed atlas of the brainstem. In MRI-based anatomical modeling for neurosurgery planning and simulation, the complexity of the functional anatomy entails a digital atlas approach, rather than less descriptive voxel or surfacebased approaches. However, there is an insufficiency of descriptive digital atlases, in particular of the brainstem. Our approach proceeds from a series of numbered, contour-based sketches coinciding with slices of the brainstem featuring both closed and open contours. The closed contours coincide with functionally relevant regions, in which case our objective is to fill in each corresponding label, which is analogous to painting numbered regions in a paint-by-numbers kit. The open contours typically coincide with cranial nerve tracts as well as symbols representing the medullary pyramids. This 2D phase is needed in order to produce densely labeled regions that can be stacked to produce 3D regions, as well as identifying embedded paths and outer attachment points of cranial nerves. In future work, the stacked labeled regions will be resampled and refined probabilistically, through active contour and surface modeling based on MRI T1, T2 and tractographic data. The relevance to spine modeling of this project is two-fold: (i) this atlas will fill a void left by the spine and brain segmentation communities, as no digital atlas of the brainstem exist, and (ii) this atlas is necessary to make explicit the attachment points of major nerves having both cranial and spinal origin, specifically nerves X and XI, as well all the attachment points of cranial nerves other than I and II. © Springer International Publishing Switzerland 2015.

关键词： Neurosurgery

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