| A Hybrid Visual
Environment for Models and Objects |
||
|---|---|---|
| Paul A.
Fishwick Department of Computer & Information Science & Engineering University of Florida Gainesville, Florida 32611, U.S.A. |
||
| ABSTRACT | ||
| Models and objects that are modeled are usually kept in different places when we consider most modern simulation software packages. Software that permits the user to view 3D objects may also permit a viewing of the dynamic models for the objects, but these views are usually separate. The object can be ro-tated, translated and navigated while the model is represented in a 2D fashion using text or 2D iconic graphics. We present an approached based on the Virtual Reality Modeling Language (VRML), where the object and model reside in the same space. A browsing capability is built to allow the user to search for models "within" objects. Aside from the visual benefits derived from this integrated approach, this methodology also suggests that models are re-ally not very different from objects. Any object can serve to model another object and when these objects are made "web friendly," it becomes feasible to use VRML to create distributed models whose compo-nents can reside anywhere over the web. | ||
| Return to
Wintersim |
||
| WEB-BASED SIMULATION
VISUALIZATION USNG JAVA3D |
||
|---|---|---|
| Chad F.
Salisbury Steven D. Farr Jason A. Moore Air Force Research Laboratory / IFSB 525 Brooks Rd Rome, New York 13441-4505, U.S.A. |
||
| ABSTRACT | ||
| The coupling of Java3D and applet
technologies has the potential to revolutionize web-based simulation
visualization. Applets can enable the dynamic and distributed
instantiation and elimination of viewers that until now was not possible.
A visualizer based on these technologies is under development at the Air
Force Research Laboratory's Information Directorate. Unlike existing
visualizers that must be running at the simulation's start time, this tool
allows users to come and go as they please - effectively allowing one to
peer into the state of a simulation at a place, perspective, and time that
is of specific interest to them. Intense 3D graphics have been difficult to program and distribute among heterogeneous environments until the inception of Java3D. Sun Microsystems' Java3D provides users the best acceleration their platform can support while the WWW provides the transmission and communication infrastructure. This paper discusses a government owned, browser-based simulation visualizer capable of displaying simulated entities to any number of distributed sites. | ||
| Return to
Wintersim |
||
| SCENARIO MANAGEMENT IN
WEB-BASED SIMULATION |
||
|---|---|---|
| Andrew F.
Seila Department of MIS Terry College of Business University of Georgia Athens, GA 30602-6273, U.S.A. |
John A.
Miller Department of Computer Science University of Georgia Athens, GA 30602-7404, U.S.A. |
Andrew F.
Seila John A. Miller Terry College of Business University of Georgia Athens, GA 30602-7404, U.S.A. |
| ABSTRACT | ||
| Internet communications in general and the World-Wide Web specifically are revolutionizing the computer industry. Today, the Web is full of important documents and clever applets. Java applets and servlets are beginning to appear that provide useful and even mission critical applications. From the perspective of simulation, a future Web will be full of simulation models and large amounts of simulation-generated data. Many of the models will include two or three dimensional animation as well as virtual reality. Others will allow human interaction with simulation models to control or influence their execution no matter where the user is located in the world. Analysis of data from Web-based simulations involves greater degrees of freedom than traditional simulations. The number of simulation models available and the amount of simulation data are likely to be much greater. In order to assure the quality of data, the execution of models under a variety of scenarios should be well managed. Since the user community will also be larger, quality assurance should be delegated to agents responsible for defining scenarios and executing models. A major element of simulation analysis is the analysis of output data, which manages the execution of simulation models, in order to obtain statistical data of acceptable quality. Such data may be used to predict the performance of a single system, or to compare the performance of two or more alternative system designs using a single or multiple performance measures. | ||
| Return to
Wintersim |
||
| COMPONENT-BASED
SIMULATION ON THE WEB? |
||
|---|---|---|
| Michael Pidd Noelia Oses Roger .J. Brooks Department of Management Science Lancaster University Lancaster LA1 4YX UK |
||
| ABSTRACT | ||
| Various forms of distributed simulation are possible over the world-wide web, including simple multiple replications of the same model, client-server architectures for one or more simultaneously running models and the distributed operation of one or more linked models. Like all web-based operations, these simulations are slow due to current bandwidth limitations, but that could change in the next few years. Languages such as Java make this distributed work possible within standard web-browsers such as Internet Explorer and Netscape, though security considerations mean that this is not always straightforward. Component-based simulation stems from the ideas of object-orientation, which enable libraries of simulation based components to be developed for re-use. The development of the world-wide-web means that distributed component, discrete simulation libraries in Java are now feasible. This paper reviews some of these developments and considers requirements for such distributed libraries, drawing on our experience at Lancaster. | ||
| Return to
Wintersim |
||
| WEB-BASED ANALYSIS AND
DISTRIBUTED IP |
||
|---|---|---|
| Philip A.
Wilsey Clifton Labs, Inc. Cincinnati, Ohio~~45241, U.S.A. |
||
| ABSTRACT | ||
| The web presents an opportunity for realizing a distributed design framework supporting multi-disciplinary, multi-organizational collaborative design and analysis activities. The potential for deploying online, reusable parts libraries for virtual prototyping and design analysis exists. However, several issues must be solved before vendors will be willing to provide online access to their intellectual property (IP). This paper reviews the main problems facing the web-based design and analysis community before the successful application of web-based virtual prototyping can become a reality. To amplify and solidify our arguments, the application domain of web-based hardware/software co-design is used. | ||
| Return to
Wintersim |
||
| VRML FOR URBAN
VISUALIZATION |
||
|---|---|---|
| Lee A. Belfore,
II Rajesh Vennam Department of Electrical and Computer Engineering Virginia Modeling, Analysis and Simulation Center Old Dominion University Norfolk, Virginia, 23529 |
||
| ABSTRACT | ||
| A virtual reality modeling language (VRML) based application has been developed as a marketing tool for a commercial park. VRML is a new web based technology for specifying and delivering three-dimensional interactive visualizations over the internet through a web browser. As a part of its definition, VRML includes primitives that specify geometries, sense different conditions in in the visualization, and allow custom definition of methods. Geometries and conditions may be linked so that the geometries can be modified or added interactively. The visualization features simple operation, an extensive menu structure, dynamic creation of objects, and an arbitration scheme. | ||
| Return to
Wintersim |
||
| A GLOBAL SYNCHRONIZATION
NETWORK FOR A NON-DETERMINISTIC SIMULATION ARCHITECTURE
|
||
|---|---|---|
| Marc Bumble Lee Coraor Computer Science and Engineering The Pennsylvania State University University Park, PA 16801, U.S.A. |
||
| ABSTRACT | ||
| Our previous work presented methods of accelerating non-deterministic discrete event simulation at the processing element level. Here, two algorithms are proposed for synchronizing a network of processing elements according to the next network minimum event timestamp. One method has an expected running time of while the second has an expected running time of. A network architecture is developed and simulation results of the time expected to locate and broadcast the next network minimum timestamp are reported. | ||
| Return to
Wintersim |
||
| SCALING, HIERARCHICAL
MODELING, AND REUSE IN AN OBJECT-ORIENTED MODELING AND SIMULATION SYSTEM
|
||
|---|---|---|
| Thorsten
Daum Robert G. Sargent Simulation Research Group Department of Electrical Engineering and Computer Science Syracuse University Syracuse, New York 13244, U.S.A. |
||
| ABSTRACT | ||
| Three useful modeling techniques for specifying discrete event simulation models are discussed. Hierarchical model specification provides for model specification at different levels of abstraction. Scaling of model elements provides for the combination of similarly structured and parallel operating model elements into arrays of both fixed and dynamic sizes. Reuse of model elements allows for the repeated use of model elements specifications. The Hierarchical Control Flow Graph Model paradigm is used to demonstrate the techniques discussed. | ||
| Return to
Wintersim |
||
| SIMULATION IN THE NEXT
MILLENNIUM |
||
|---|---|---|
| Sanjay
Jain Gintic Institute of Manufacturing Technology 71 Nanyang Drive SINGAPORE 638075 |
||
| ABSTRACT | ||
| This paper looks into the future of simulation. The capabilities and features of simulation software of the future are hypothesized focusing on the major aspects of their use. The features addressed include model building, visualization, output analysis and optimization, integration and Internet. The discussion of simulation software in future is closely related to the vision of future applications of simulation. Applications of simulation in near term future are proposed using example of advanced applications that are in conceptual stages at present. Applications of simulation in long term future are also proposed, bordering on science fiction. | ||
| Return to
Wintersim |
||
| ENTERPRISE SIMULATIONS:
THEORETICAL FOUNDATIONS AND A PRACTICAL PERSPECTIVE
|
||
|---|---|---|
| Thomas W.
Mastaglio Virginia Modeling Analysis & Simulation Center 7000 College Drive Suffolk, VA 23435, U.S.A. |
||
| ABSTRACT | ||
| Simulating business enterprises is the next major application approach to using simulation technology effectively. Although the term enterprise simulation or something similar is being use with ever-increasing frequency the field lacks a clear definition and discussion of the theoretical basis for what is meant by the term. In this paper I offer my concepts and ideas of how we encapsulate this notion and what theoretical foundations can help us come to a common understanding and eventually help articulate a clear and agreed upon definition of the concept of an enterprise simulation. | ||
| Return to
Wintersim |
||
| APPLICATIONS FOR
ENTERPRISE SIMULATION |
||
|---|---|---|
| Roland R.
Mielke Department of Electrical and Computer Engineering Old Dominion University Norfolk, Virginia 23529, U.S.A. |
||
| ABSTRACT | ||
| The purpose of this paper is to describe several recent applications of enterprise simulation. An enterprise simulation is a simulation which is constructed with a top-down view of a business enterprise and which is intended to serve as a decision support tool for decision makers. Examples are taken from the domain areas of transportation, urban operations, supply chain management, entertainment, and manufacturing. The objective is to help clarify the meaning of the term enterprise simulation and to promote its use as an important management tool. | ||
| Return to
Wintersim |
||
| THE APPLICATION OF
SYSTEM DYNAMICS (SD) SIMULATION TO ENTERPRISE MANAGEMENT
|
||
|---|---|---|
| John F.
Affeldt Booz·Allen & Hamilton 8283 Greensboro Drive McLean, VA 22102-3838, U.S.A. |
||
| ABSTRACT | ||
| This paper presents the background and some of the lessons learned from a project in which System Dynamics (SD) simulation was applied in the enterprise environment. The organization simulated is a large commercial concern, developing and marketing new products as well as existing products in a highly competitive environment. SD simulation was used to examine business practices, validate corporate performance measures, train senior leaders in Systems Thinking, and to produce a forecast of long term profits and loss. The application of SD to enterprise simulation is not new; the scale of this application, and some of the techniques used for design and rollout make the project unique. | ||
| Return to
Wintersim |
||
| WHAT DOES INDUSTRY NEED
FROM SIMULATION VENDORS IN Y2K AND AFTER? A PANEL DISCUSSION
|
||
|---|---|---|
| Jerry
Banks AutoSimulations, Inc. Marietta, GA 30067 USA |
||
| ABSTRACT | ||
| Panelists respond to the question, "What does industry need from simulation vendors in Y2k and after?" The panelists include software vendors, simulation modelers from industry, simulation consulting, and academia. | ||
| Return to
Wintersim |
||
| PANEL: STRATEGIC
DIRECTIONS IN SIMULATION RESEARCH |
||
|---|---|---|
| Ernest H.
Page The MITRE Corporation 1820 Dolley Madison Boulevard McLean, VA 22102, U.S.A. |
David M.
Nicol Department of Computer Science 6211 Sudikoff Laboratory Dartmouth College Hanover, NH 03755, U.S.A. |
Osman
Balci Department of Computer Science Virginia Tech Blacksburg, VA 24061, U.S.A. |
| Richard M. Fujimoto College of Computing Georgia Tech Atlanta, GA 30332, U.S.A. |
Paul A. Fishwick Department of Computer & Information Science and Engineering University of Florida CSE 301 Gainesville, FL 32611, U.S.A. |
Pierre L'Ecuyer Departement d'Informatique ét de Recherche Operationelle Université dé Montréal C.P. 6128, Succ. Centre-Ville Montréal, Québec, Canada H3C 3J7 |
| Roger Smith BTG Inc. 3481 Woodley Park Place Oviedo, FL 32765, U.S.A. |
||
| ABSTRACT | ||
| We consider the future directions of simulation research. | ||
| Return to
Wintersim |
||