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A case study of model context for simulation composability and reusability 05

A case study of model context for simulation composability a...

引用

simulation Winter Conference

作者： M. Spiegel P.F. Reynolds D.C. Brogan Modeling and Simulation Technology Research Initiative Department of Computer Science University of Virginia Charlottesville VA USA

ISBN: (纸本)9780780395190

How much effort will be required to compose or reuse simulations? What factors need to be considered? It is generally known that composability and reusability are daunting challenges for both simulations and more broadly software design as a whole. We have conducted a small case study in order to clarify the role that model context plays in simulation composability and reusability. For a simple problem: compute the position and velocity of a falling body, we found that a reasonable formulation of a solution included a surprising number of implicit constraints. Equally surprising, in a challenge posed to a small group of capable individuals, no one of them was able to identify more than three-quarters of the ultimate set of validation constraints. We document the challenge, interpret its results, and discuss the utility our study will have in future investigations into simulation composition and reuse.

关键词： Context modeling computer aided software engineering Computational modeling Software design Humans Gain measurement Gravity Research initiatives computer science Best practices

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simulation-specific characteristics and software reuse 05

Simulation-specific characteristics and software reuse

引用

simulation Winter Conference

作者： J.C. Carnahan P.F. Reynolds D.C. Brogan Modeling and Simulation Technology Research Initiative Department of Computer Science University of Virginia Charlottesville VA USA

ISBN: (纸本)9780780395190

We argue that simulations possess interesting characteristics that facilitate adaptation. Simplifying assumptions, stochastic sampling, and event generation are common features which lend themselves to adaptation for reuse. In this paper, we explore simulation-specific characteristics amenable to adaptation and the ways they can be exploited in support of reuse. Our work is of particular relevance to research in component based simulations and dynamic data driven application systems, where adaptability and reuse are essential.

关键词： Object oriented modeling Computational modeling Software engineering Object oriented programming Stochastic processes Sampling methods Software design computer simulation Research initiatives computer science

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A dynamic data mining technique for intrusion detection systems 43

A dynamic data mining technique for intrusion detection syst...

引用

43rd Annual Association for Computing Machinery Southeast Conference, ACMSE '05

作者： Caulkins, Bruce D. Lee, Joohan Wang, Morgan Department of Modeling and Simulation University of Central Florida Orlando FL 32816 United States Computer Science Department University of Central Florida Orlando FL 32816 United States Department of Statistics and Actuarial Science University of Central Florida Orlando FL 32816 United States

ISBN: (纸本)1595930590

In today's interconnected world of computer networks, there exists a need to provide secure and safe transactions through the use of firewalls, Intrusion Detection Systems (IDSs), encryption, authentication, and other hardware and software solutions. Many IDS variants exist which allow security managers and engineers to identify attack network packets primarily through the use of signature detection;i.e., the IDS "recognizes" attack packets due to their well-known "fingerprints" or signatures as those packets cross the network's gateway threshold. On the other hand, anomalybased ID systems determine what is normal traffic within a network and reports abnormal traffic behavior. We report the findings of our research in the area of anomaly-based intrusion detection systems using data-mining techniques described in section 3.3 to create a decision tree model of our network using the 1999 DARPA Intrusion Detection Evaluation data set. After the model was created, we gathered more data from our local campus network and ran the new data through the model. Copyright 2005 ACM.

关键词： Intrusion detection

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Roughness-induced transient growth

Roughness-induced transient growth

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35th AIAA Fluid Dynamics Conference and Exhibit

作者： Choudhari, Meelan Fischer, Paul Computational Modeling and Simulation Branch NASA Langley Research Center M.S. 128 Hampton VA 23681 United States Argonne National Laboratory Mathematics and Computer Science Division 9700 S. Cass Avenue Argonne IL 60439 United States

ISBN: (纸本)9781624100598

Numerical simulations are used to model the boundary layer disturbance field due to a spanwise periodic array of circular disks at the surface. Our earlier computations (Fischer and Choudhari 2004) reproduced some of the major trends associated with roughness induced transient growth as measured by White and Ergin (2003), confirming the accuracy of their data reduction technique. The present paper explores the effects of roughness height, shape, and size on the transient growth along the wake of the roughness array. Results indicate the range of roughness heights over which the energy levels of the dominant stationary disturbance are consistent with the empirically determined Rek2 scaling of White and Ergin. Computations further reveal the intricate effects of disturbance nonlinearity on transient growth characteristics. At sufficiently large roughness heights, simulations indicate spontaneous vortex shedding behind the roughness array, which has been identified in previous experiments as a precursor to premature transition (i.e., tripping) of the laminar boundary layer. The effect of stationary, suboptimal transient growth disturbances on the amplification of Tollmien-Schlichting instability waves in the boundary layer is also assessed in the light of the recent findings concerning the stabilizing influence of optimal growth streaks (Cossu and Brandt 2002).

关键词： Laminar boundary layer

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A cots simulation package emulator (CSPE) for investigating cots simulation package interoperability

A cots simulation package emulator (CSPE) for investigating ...

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2005 Winter simulation Conference

作者： Wang, Xiaoguang Turner, Stephen John Taylor, Simon J. E. Low, Malcolm Yoke Hean Gan, Boon Ping Parallel and Distributed Computing Centre School of Computer Engineering Nanyang Technological University 639798 Singapore Singapore Centre for Applied Simulation Modeling School of Information Systems Computing and Mathematics Brunel University Uxbridge UB8 3PH United Kingdom D-SIMLAB Programme Singapore Institute of Manufacturing Technology 71 Nanyang Drive 638075 Singapore Singapore

ISBN: (纸本)0780395204

Commercial Off-The-Shelf (COTS) simulation Packages (CSPs) are widely used to facilitate the creation of simulation models using some kind of visual interactive interface. CSPs have "evolved" over the years and are well used to support modeling demands in different market niches and domains. However, in terms of distributed simulation, there is almost a complete lack of support for interoperability. The advent of the High Level Architecture (HLA) standard makes it possible to connect distributed model components together. The model components can be developed using specific CSPs best suited to the application area. In this paper, a CSP Emulator (CSPE) is proposed to investigate the interfaces between the CSPs and the HLA Runtime Infrastructure. In addition to support for standalone models as provided by current CSPs, the CSPE has some new features needed for building distributed models. An evaluation is conducted between CSPE and Simul8, one of the popular CSPs.

关键词： Electronics packaging

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Analysis of transition-sensitized turbulent transport equations

Analysis of transition-sensitized turbulent transport equati...

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43rd AIAA Aerospace Sciences Meeting and Exhibit

作者： Rumsey, Christopher L. Thacker, William D. Gatski, Thomas B. Grosch, Chester E. NASA Langley Research Center Hampton VA 23681-2199 United States St. Louis University St. Louis MO 63156 United States Old Dominion University Norfolk VA 23529 United States Computational Modeling and Simulation Branch Mail Stop 128 United States AIAA United States Department of Physics Parks College United States Departments of Oceanography and Computer Science

The dynamics of an ensemble of linear disturbances in boundary-layer flows at various Reynolds numbers is studied through an analysis of the transport equations for the mean disturbance kinetic energy and energy dissipation rate. Effects of adverse and favorable pressure-gradients on the disturbance dynamics are also included in the analysis. Unlike the fully turbulent regime where nonlinear phase scrambling of the fluctuations affects the flow field even in proximity to the wall, the early stage transition regime fluctuations studied here are influenced across the boundary layer by the solid boundary. The dominating dynamics in the disturbance kinetic energy and dissipation rate equations are described. These results are then used to formulate transition-sensitized turbulent transport equations, which are solved in a two-step process and applied to zero-pressure-gradient flow over a flat plate. Computed results are in good agreement with experimental data.

关键词： Turbulence

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Packet- vs. session-based modeling for intrusion detection systems

Packet- vs. session-based modeling for intrusion detection s...

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International Conference on Information Technology: Coding and Computing (ITCC)

作者： B.D. Caulkins Joohan Lee M. Wang Department of Modeling and Simulation University of Central Florida Orlando FL USA Computer Science Department University of Central Florida Orlando FL USA Department of Statistics and Actuarial Science University of Central Florida Orlando FL USA

In today's interconnected networks, intrusion detection systems (IDSs), encryption devices, firewalls and other hardware and software solutions are critical in providing complete security solutions for corporations and government agencies. Many IDS variants exist which allow security personnel to identify attack network packets primarily through the use of signature detection where the IDS "recognizes" attack packets due to their well-known signatures as those packets cross the network's gateway threshold. However, anomaly-based ID systems identify normal traffic within a network and report abnormal behavior. We report the findings of our research in the area of anomaly-based intrusion detection systems using data-mining techniques to create a decision tree model of our network using the 1999 DARPA intrusion detection evaluation data set. After the model was created, we gathered data from our local campus network and scored the new data through the model using both packet-based and session-based modeling and compare the results.

关键词： Intrusion detection Detectors Radar detection Telecommunication traffic Traffic control computer networks Internet Cryptography Data security Protection

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Hybrid discrete event simulation with model predictive control for semiconductor supply-chain manufacturing

Hybrid discrete event simulation with model predictive contr...

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simulation Winter Conference

作者： H.S. Sarjoughian Dongping Huang G.W. Godding Wenlin Wang D.E. Rivera K.G. Kempf H.D. Mittelmann Arizona Center for Integrative Modeling & Simulation Computer Science & Engineering Department Arizona State University Tempe AZ USA Control Systems Engineering Laboratory Chemical & Materials Engineering Department Arizona State University Tempe AZ USA Decision Technologies Intel Corporation Chandler AZ USA Mathematics & Statistic Dept. Arizona State University Tempe AZ USA

simulation modeling combined with decision control can offer important benefits for analysis, design, and operation of semiconductor supply-chain network systems. Detailed simulation of physical processes provides information for its controller to account for (expected) stochasticity present in the manufacturing processes. In turn, the controller can provide (near) optimal decisions for the operation of the processes and thus handle uncertainty in customer demands. In this paper, we describe an environment that synthesizes discrete-event system specification (DEVS) with model predictive control (MPC) paradigms using a knowledge interchange broker (KIB). This environment uses the KIB to compose discrete event simulation and model predictive control models. This approach to composability affords flexibility for studying semiconductor supply-chain manufacturing at varying levels of detail. We describe a hybrid DEVS/MPC environments via a knowledge interchange broker. We conclude with a comparison of this work with another that employs the Simulink/MATLAB environment.

关键词： Discrete event simulation Predictive models Predictive control Virtual manufacturing Semiconductor device manufacture Mathematical model Analytical models Manufacturing processes Optimal control Uncertainty

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modeling and simulation research and instruction at the U.S. Air Force Academy

Modeling and simulation research and instruction at the U.S....

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Collection of Technical Papers - AIAA modeling and simulation Technologies Conference

作者： Cummings, Russell M. Morton, Scott A. Bergeron, Keith United States Air Force Academy USAF Academy CO 80840 Department of Aeronautics HQ USAFA DFAN Modeling and Simulation Research Center Modeling and Simulation Advisory Committee Department of Computer Science HQ USAFA DFCS

ISBN: (纸本)1563476746

modeling and simulation has become a driving force within the engineering and science communities as the cost of, and time for, experimentation continues to rise. Some areas of study, such as chemistry and biology, may not even have the ability to fully evaluate certain processes experimentally, making modeling and simulation even more important. The situation has led many areas of research to the necessity of modeling and simulating various processes using computers. In addition, the rise in computational capabilities (the supercomputers of a decade ago are outmoded by the PC clusters of today), has led to a paradigm shift from using the computer resources only available to a few researchers to a tool now available to many people. Researchers at the U.S. Air Force Academy are working to bring these modeling and simulation tools into the classroom and laboratories for students to learn the capabilities, and limitations, of modern computational tools. Descriptions of how modeling and simulation is performed at the Academy are included, as well as details about the computational resources being used. Most importantly, descriptions of the methods used to bring these tools to the classroom are described in detail.

关键词： Engineering education

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Embodied agents and meaningful motion

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2nd International Conference on Technologies for Interactive Digital Storytelling and Entertainment, TIDSE 2004

作者： Badler, Norman I. Computer and Information Science Center for Human Modeling and Simulation University of Pennsylvania PhiladelphiaPA19104-6389 United States

ISBN: (纸本)3540222839

We examine motion realism in terms of salient communicative features. We argue that motion is amenable to a parameterization based on Laban Movement Analysis that yields real-time control over motion qualities, and that these qualities carry discernable and useful non-verbal information about the character’s personality or emotional state. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Real time control

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