this paper we consider the relationship between web-based simulation and the High Level Architecture. We assume the reader has a general familiarity with DoD modeling and simulation (M&S). The High Level Architecture and web-based simulation are briefly reviewed in Sections 2 and 3 respectively. In Section 4 we argue that the notion of interoperability provides the key element in the relationship between web-based simulation and the HLA, and that the culture of the web may drive interoperability in such a manner as to possibly to overcome some of the recent barriers to DoD technology transfer in this area. Section 5 examines some similarities and differences between the widespread adoption of distributed simulation technologies and the adoption of parallel simulation technologies. Finally, some conclusions are given in Section 6.

Many of today's communication network systems are built using off-the-shelf components offered by third party manufacturers. The diversity in the available components has made the task of design and analysis of different network topologies and various configurations of network components, complicated. To alleviate these problems and to addresses the associated issues, a web-based framework for modeling and simulating computer networks was developed. Using the framework, a designer can explore design alternatives by constructing and analyzing configurations of the design using components offered by different researchers and manufacturers. The motivation for this design is to extend the framework to active network simulations. The framework should provide a flexible and robust environment for selecting the optimal solution set from a large and complex solution space. This paper presents the issues involved in the design and development of a framework for web-based network simulation (fwn...

The design and development of modern systems is complicated by their size and complexity. Furthermore, many complex systems are built using subsystems and components available from third party manufacturers. The diversity of the available components has made exploration of design alternatives a large task. Simulation plays an important role in the design and verification and validation (V&V) of these systems. Although numerous models for simulation have been developed, their availability, accessibility, inter-operability, and system validation coupled with proprietary information issues, have been cited as primary bottlenecks in their use. To address the issues involved in the modeling and V&V of systems, WESE: A Web-based Environment for Systems Engineering, has been developed. Using WESE, a developer can explore design alternatives by constructing and analyzing system configurations consisting of components offered by different researchers and manufacturers. WESE also provides a flex...

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This year's installment of the PADS "community assessment " looks at previous assessments and considers some current directions in distributed simulation and their possible relationship to PADS. 1. Introduction Welcome to this year's edition of PADSGestalt therapy--- the opportunity to look around and pick out all the things that are wrong with the PADS community. I know it is a rite that many in the community anticipate in much the same way they do those other notable inevitabilities, death and taxes. So I am honored that Stephen Turner invited me to give this Keynote Address---at the very least it gives me license to step outside of accepted technical writing dogma and write in first person for a change! As I understand it, the current model for the workshop is to identify Keynote addressors as insiders or infiltrators. I have been invited as an infiltrator, although I'm not sure that's the category I would place myself in. Having twice attended the workshop, once published within...

ing with credit is permitted. To copy otherwise, to republish, to post on servers, to redistribute to lists, or to use any component of this work in other works, requires prior specific permission and/or a fee. Permissions may be requested from: Publications Dept., ACM Inc., 1515 Broadway, New York, NY 10036, USA. Fax +1 (212) 869-0481, or permissions@acm.org. Web-based Network Analysis and Design Dhananjai Madhava Rao, Radharamanan Radhakrishnan, and Philip A. Wilsey University of Cincinnati The gradual acceptance of high-performance networks as a fundamental component of today's computing environment has allowed applications to evolve from static entities located on specific hosts to dynamic, distributed entities that are resident on one or more hosts. In addition, vital components of software and data used by an application may be distributed across the local /wide area network. Given such a fluid and dynamic environment, the design and analysis of high-performance communi...

With the advent of standardization efforts such as the High Level Architecture (HLA) and Distributed Interactive Simulation (DIS), inter-operability of military simulation models has emerged as the chief design requirement. By enforcing strict conformance to the DIS and/or HLA, the Defense Modeling and Simulation Office (DMSO) has so far been able to "mix-and-match" different simulation models and frameworks to satisfy the military's simulation needs. However, by linking different legacy simulations (simulations previously designed to operate independently) together, the simulation now has to correctly handle multiple levels of detail in the interacting simulation entities. In addition, a given entity itself can be represented in different ways each with a different level of detail (also referred to as resolution or fidelity). A natural question to ask in this situation is why does the model require different resolutions? Why isn't one level of resolution sufficient to address all the ...

A promising approach for treating tissue or organ failure involves the use of bioartificial tissue substitutes grown in scaffolds with appropriate structure and shape. Currently, however, the engineering of tissue substitutes is a long and costly process based exclusively on experimentation. Predictive computer models can greatly reduce the development costs of tissue-engineered therapies by enabling scientists to rapidly evaluate the effect of system parameters on the growth rates and quality of regenerated tissues. We report here the parallel implementation of a threedimensional model that employs cellular automata to describe the dynamic behavior of a population of mammalian cells that migrate, interact and proliferate to generate new tissues. The simulator uses MPI for interprocessor

Many existing frameworks for discrete event simulation impose a structure on the implementation that distorts traceability between it and the conceptual domain model. In particular, events and constructs must be added to support associations. Typically, thousands of associations form and dissolve during a simulation run, so their manipulation is critical. This paper presents a simulation package called EASY that specifically supports association manipulation with built-in mechanisms that reduce the need for implementation constructs. EASY promotes loose coupling between domain objects and improves the traceability between conceptual models and their implementations. The design can be incorporated into other simulation frameworks to simplify the implementation and allow it to reflect rather than distort the domain model. 1.

Abstract. The automated analysis of model specifications is an area that historically receives little attention in the simulation research community but which can offer significant benefits. Since a common objective in simulation is enhanced understanding of a system, analysis of a model specification can provide insights not otherwise available. In addition, it can result in both time and cost savings to model development efforts. The Condition Specification (CS) [5] represents one of the model specification forms that is amenable to useful and informative analysis. Current Web-based technologies such as XML offer exciting new approaches to extend our knowledge in this and other areas of simulation research. This paper discusses the motivations for and the creation of an XML Schema for the Condition Specification; a translator for the CS grammar into an XML-based Condition Specification (CS-XML); and a translator for the CS-XML into a fully-executable C/C++ program. It proposes immediate future work using CodeSurfer [1], a software static analysis tool, for model analysis. In conclusion, it is argued that the CS-XML can provide an essential foundation for Web Services that support the analysis of discrete-event simulation models.