Richard Fujimoto, Atlanta, USA
from 13:30 to 15:30
|Where||R 11, University Library, Albert-Einstein-Str.6|
|Contact Name||Prof. Richard Fujimoto|
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Ad Hoc Distributed Simulations
Georgia Institut of Technology, Atlanta GA, USA
An ad hoc distributed simulation is a collection of autonomous on-line simulations, each modeling some portion of a larger physical system, that are brought together through a mobile, wireless network to predict future states of the overall system. Unlike conventional distributed simulations that are designed in a largely top-down fashion by partitioning the physical system and mapping each element to a logical process, ad hoc distributed simulations are constructed bottom-up, resulting in multiple simulators modeling common, overlapping portions of the physical system. Ad hoc distributed simulations combine elements of conventional distributed simulations and replicated trials, and raise new issues concerning data distribution and synchronization. The ad hoc simulation approach is proposed, as well as an optimistic synchronization protocol designed for use in these systems. An ad hoc distributed simulation prototype is described that couples collections of in-vehicle simulations intended to manage a transportation network. Experimental results are presented demonstrating that this approach can be effective in predicting future system states when compared to a replicated experiment simulating the full transportation network. Finally, the issue of converting existing commercial simulations to the ad hoc distributed simulation approach is discussed, and experiences converting the widely-used VISSIM simulator for use in ad hoc distributed simulation environments are described.