Browsing by Author "Derrick, Emory Joseph"

Now showing 1 - 7 of 7
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    A Comparison of Selected Conceptual Frameworks for SimulationModeling
    Derrick, Emory Joseph; Balci, Osman; Nance, Richard E. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1989)
    The purpose of this paper is compare 13 Conceptual Frameworks (CFs) selected from among several catagories of applicability to discrete-event simulation modeling. Each CF is briefly reviewed to provide the background information required for the comparison. Based on the insights gained in applying the CFs to the modeling complex traffic intersection system, the CFs are compared to their distinct characteristics and capabilities. Comparative comments are grouped according to the design guidance and implementation guidance features of the CFs. Conclusions highlight the inadequacies of the CFs and the importance of research in CF development.
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    Conceptual frameworks for discrete event simulation modeling
    Derrick, Emory Joseph (Virginia Tech, 1988-08-05)
    This thesis examines those aspects of simulation with digital computers which concern the use of conceptual frameworks (CFs) for the design and implementation of a model. A literature review of CFs which are in common use is conducted. These CFs are applied to a complex modeling problem, a traffic intersection system. A comparative review of the CFs is given based upon the lessons learned from the above applications, and a taxonomy is developed. The research clarifies the differences that exist among the myriad of CFs in use today. In particular, the comparative review highlights the significant CF features that are necessary for successful model representation of discrete-event systems. The taxonomy provides a useful and meaningful classification of CFs and produces insights in to the conceptual relationships that exist among them. The characteristics of CFs that are desired to enable the development of model specifications that are analyzable, domain independent, and fully translatable are identified. The roles of CFs are better understood and specific potential directions for future research are pinpointed.
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    DOMINO: A Multifaceted Conceptual Framework for Visual Simulation Modeling
    Derrick, Emory Joseph; Balci, Osman (Department of Computer Science, Virginia Polytechnic Institute & State University, 1992)
    The purpose of this paper is to present a new conceptual framework for visual simulation modeling, the multifaceD coOnceptual fraMework for vIsual simulatioN mOdeling (DOMINO). The DOMINO provides both design and implementation guidance to furnish a broad range of support during the model development life cycle; enables the modeler to work under the object-oriented paradigm; guides the modeler in graphically structuring a visual simulation model at multiple levels of abstraction; enables the extraction of sufficient information from the modeler so that the model execution can be visualized; embodies a WYSIWYR (What You See Is What You Represent) philosophy and enables the modeler to represent a system as it is naturally perceived; among many other features.
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    Local Area Networks and the Dynamic Hierarchy: A Tutorial
    Derrick, Emory Joseph; Nance, Richard E. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1986-05-01)
    The technology of the 197O's and 80's has introduced electronics equipment with capabilities that were not considered possible only a few short years ago. The impact has been widespread, providing innovations in business, professional, military, and government applications with considerable political, economic, and social ramifications. With the rapid increase in capabilities has come a corresponding growth in the need to better manage these high-tech resources in order to realize their potential. A primary key to achieving this end is the cost effective, rapid, and reliable processing of information through networking.
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    Model Generation Issues in a Simulation Support Environment
    Balci, Osman; Nance, Richard E.; Derrick, Emory Joseph; Page, Ernest H.; Bishop, John L. (Department of Computer Science, Virginia Polytechnic Institute & State University, 1990)
    No longer available as a technical report. Contact authors re reprints of published article.
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    A visual simulation support environment based on a multifaceted conceptual framework
    Derrick, Emory Joseph (Virginia Tech, 1992-04-05)
    This thesis presents the development of a multifaceted conceptual framework for discrete-event simulation and its implementation within an integrated visual simulation support environment (VSSE). The intertwined research objectives regarding the conceptual framework and the companion VSSE are presented. A literature review of related work is conducted. The core of the thesis describes the conceptual framework (called the DOMINO), the VSSE and each of the tools from its supporting toolset, and the VSMSL (Visual Simulation Model Specification Language). Three example model applications (bus route, traffic intersection, and branch operations examples) demonstrate the use of the VSSE and the underlying DOMINO. The thesis is evaluated using the research objectives as assessment criteria. The DOMINO is truly multifaceted. Both graphical and object-oriented, the DOMINO provides design and implementation guidance over the simulation model life cycle. The DOMINO is not restricted to specific problem domains but is independent of application domain. Several different perspectives for developing model component logic are available to modelers under the VSMSL. The VSSE demonstrates significant advances in integrated, automated support for model development which include graphical facilities for definition and specification and effective verification techniques. The VSSE underscores the contributions of the research effort and has helped to identify potential areas for future research.
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    A Visual Simulation Support Environment Based on the DOMINO Conceptual Framework
    Derrick, Emory Joseph; Balci, Osman (Department of Computer Science, Virginia Polytechnic Institute & State University, 1992)
    The purpose of this paper is to present a Visual Simulation Support Environment (VSSE) based on the multifaceD coOnceptual fraMework for vIsual simulatioN mOdeling (DOMINO). The ever-increasing complexity of visual simulation model development is undeniable. There is a need for automated support throughout the entire visual simulation model development life cycle. This support is furnished by the VSSE which is composed of integrated software tools providing computer-aided assistance in the development and execution of a visual simulation model. The VSSE has been jointly developed with the DOMINO. Its architecture consists of three layers: hardware and operating system, kernel VSSE, minimal VSSE, and VSSEs. This paper focuses on the minimal VSSE toolset. Evaluation of the VSSE shows that it adequately satisfies all of its 13 design objectives.