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A Lane-based Predictive Model of Downstream Arrival Rates in a Queue Estimation Model Using a Long Short-Term Memory Network

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Transportation Research Procedia 2018年 34卷 163-170页

作者： Seunghyeon Lee Kun Xie Dong Ngoduy Mehdi Keyvan-Ekbatani Hong Yang Department of Civil and Natural Reources Engineering University of Canterbury Christchurch New Zealand Department of Modeling Simulation & Visualization Engineering Old Dominion University Norfolk USA

In this study, we develop a mathematical framework to predict cycle-based queued vehicles at each individual lane using a deep learning method – the long short-term memory (LSTM) network. The key challenges are to decide the existence of residual queued vehicles at the end of each cycle, and to predict the lane-based downstream arrivals to calculate vertical queue lengths at individual lanes using an integrated deep learning method. The primary contribution of the proposed method is to enhance the predictive accuracy of lane-based queue lengths in the future cycles using the historical queuing patterns. A major advantage of implementing an integrated deep learning process compared to the previously Kalman-filter-based queue estimation approach (Lee et al., 2015) is that there is no need to calibrate the co-variance matrix and tune the gain values (parameters) of the estimator. In the simulation results, the proposed method perform better in only straight movements and a shared lane with left turning movements.

关键词： Type your keywords here separated by semicolons

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modeling of Incident-Induced Capacity Loss for Hurricane Evacuation simulation

Modeling of Incident-Induced Capacity Loss for Hurricane Eva...

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International Conference on Intelligent Transportation

作者： Yuan Zhu Kaan Ozbay Kun Xie Hong Yang Transportation Institute of Inner Mongolia University Hohhot China New York University C2SMART Center (A Tier USDOT UTC) Brooklyn NY USA Department of Civil & Environmental Engineering Old Dominion University Norfolk VA USA Department of Modeling Simulation & Visualization Engineering Old Dominion University Norfolk VA USA

ISBN: (纸本)9781538670255

modeling and simulation of hurricane evacuation is an important task in emergency planning and management. One typically ignored factor that affects the development of a reliable evacuation model is the uncertainty caused by the incident-induced capacity loss. Lately, the impact of incidents on evacuation has drawn increasingly attention among researchers and practitioners, but few of them thoroughly investigated it using the real data in the modeling and simulation context. This study aims to investigate the impact of various types of incidents on modeling and simulation of hurricane evacuation. Particularly, the incidents that occurred under actual hurricane conditions are examined and their impact on the capacity loss is modeled. The developed incident frequency and duration models are incorporated into the network assignment model to study traffic conditions under hurricane Sandy in New York. Results show that the consideration of incident-induced capacity loss can greatly change the outcome of the evacuation model. Our findings suggest the need to include a well calibrated and validated traffic incident generation module for modeling and simulating hurricane evacuation.

关键词： Hurricanes Data models Accidents Urban areas Roads Planning

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Convergence and resilience of the fine-grained parallel incomplete LU factorization for non-symmetric problems 18

Convergence and resilience of the fine-grained parallel inco...

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Proceedings of the High Performance Computing Symposium

作者： Evan Coleman Masha Sosonkina Dahlgren Division Naval Surface Warfare Center USA Department of Modeling Simulation and Visualization Engineering Old Dominion University USA

ISBN: (纸本)9781510860162

This paper presents an investigation into the convergence of the fine-grained parallel algorithm for computing an incomplete LU factorization for non-symmetric and indefinite matrices. The fine-grained parallel incomplete LU factorization is a nonlinear fixed point iteration and convergence has not been extensively studied for problems that are not symmetric positive definite. This work investigates the convergence of the algorithm for these more difficult problems and additionally investigates how the occurrence of a computing fault may impact the convergence of the algorithm for the problems being studied. The results obtained suggest that this class of problems presents challenges for the fine-grained parallel incomplete LU factorization (less than 30% of configurations converge naturally), and that while the occurrence of a fault can cause significant negative effects, the simple algorithmic change advocated here can completely ameliorate the effects of a fault.

关键词： fault tolerance

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An agent-based simulation of the impact of yogic breathing adoption 49

An agent-based simulation of the impact of yogic breathing a...

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

作者： Nisperos, Saturnina Kakde, Sonali McKenzie, Frederic Department of Modeling Simulation and Visualization Engineering Old Dominion University NorfolkVA United States

ISBN: (纸本)9781510838284

Stress can impose negative impact on the health and well-being of a person. People who do not have tools to manage their stress are more likely to acquire cardiovascular disease (CVD) -The leading cause of death in the USA. For affected individuals, it not only implies health risks but also increased medical expenditures which can lead to financial issues -The top stressor in the USA. Research studies reveal that yoga reduces the stress perceived and modulates stress response systems. In this study, an agent-based model was developed to simulate the impact of adopting a yogic breathing technique, particularly on managing stress, preventing CVD and reducing the associated medical expenses. The simulation results show that people who practice SKY have generally lower and normal SBP, BMI and stress levels while those who don't, have generally higher levels and fall into the high-risk category. © 2017 Society for modeling & simulation International (SCS).

关键词： Health risks

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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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Daejeon16 NN interaction

arXiv

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arXiv 2019年

作者： Kim, Y. Shin, I.J. Shirokov, A.M. Sosonkina, M. Maris, P. Vary, J.P. Rare Isotope Science Project Institute for Basic Science Daejeon34047 Korea Republic of Skobeltsyn Institute of Nuclear Physics Moscow State University Moscow119991 Russia Department of Physics Pacific National University Khabarovsk680035 Russia Department of Modeling Simulation and Visualization Engineering Old Dominion University NorfolkVA23529 United States Department of Physics and Astronomy Iowa State University AmesIA50011 United States

We have developed a realistic nucleon-nucleon (NN) interaction, dubbed Daejeon16. We start from a SRG (similarity renormalization group) evolved chiral N3LO interaction. We then apply PETs (phase-equivalent transformations) to the SRG-evolved interaction. It turned out that the obtained in such a way Daejeon16 NN interaction provides a good description of various observables in light nuclei without NNN forces. In this contribution, we present our new results for some selected nuclei using the ab initio no-core shell model (NCSM) with the Daejeon16 interaction. One of the interesting results is that the ab initio NCSM with Daejeon16 clearly demonstrates the phenomenon of parity inversion in 11Be, i. e., the ground state in 11Be has the spin-parity 1/2+ in experiments contrary to the expectation from the conventional shell model. Copyright © 2019, The Authors. All rights reserved.

关键词： Statistical mechanics

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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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