Delays and congestion are terms often used to describe contemporary
transportation systems - and the air transportation system is no exception.
It has been estimated that congestion-induced delays cost commercial
airlines billions of dollars in operating costs each year, to say nothing
of the costs and inconvenience imposed on travelers and businesses who
rely on air transportation. In many cases, the congestion and its
resulting delays can be alleviated with foresight and careful planning.
The Detailed Policy Assessment Tool (DPAT) was developed by the
Corporation's Center for Advanced Aviation System Development
The DPAT tool can significantly aid in analyses aimed at finding solutions
to the problems of congestion and delay.
DPAT uses the Georgia Tech Time Warp
parallel discrete event simulation software.
The DPAT aviation work can provide a simulation of an entire
air traffic control system, such as that of the continental United States,
the Asia-Pacific region, or the entire world. Its purpose is to predict
the system-wide congestion and delays casued by excessive traffic, poor
weather, equipment outages, new facility construction, or any combination
of these factors. The tool's unique contribution is its ability to
propogate delays from one region of the system to another: for example,
when bad weather in San Francisco affects traffic in Chicago - or across
the Pacific Ocean, in Asia.
DPAT's visual graphical user interface (GUI) uses Web technologies for true
DPAT runs on a commercial off-the-shelf multiprocessor UNIX machine. The
recommended configuration is a Sun multiprocessor server, with 128 meg RAM
and 4 processors. The program, input, and output require less than 100 megs
of disk storage.
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working in the areas of public interest that addresses issues of critical
national importance, combining systems engineering and information
technology to develop innovative solutions that make a difference.