Dear hackers:
A demo about arrival and service times of a simple phone system which uses
the DE-domain of PtolemyII 0.2 can be viewed at:
http://entmuc.et.tu-dresden.de:4660/ptII/ptolemy/domains/de/demo/WirelessSystem.html
That demo is written as an applet. The demo.jar file, which is to be downloaded,
includes
most of the *.class files of PtolemyII 0.2 and is roughly 400 k large. Please consider
the
size when downloading via long-distance.
The applet is tested with Netscape 4.51, but should also work with IE4.x and IE5.x.
If it hangs up, just try the usual shift-reload/control-reload.
Please, don't forget to open the Java console.
However, that demo is neither sophisticated nor too useful at all. It is just my first
working applet using PtolemyII. Maybe that applet might just help other users of
Ptolemy
when they want to have a look into PtolemyII. Many more demos of PtolemyII
are provided by the Ptolemy-group at the usual Ptolemy-http in Berkeley.
The complete description of the Wireless System demo is included below.
Have fun,
Jens
----------------------
The above applet uses the Ptolemy II Discrete Event (DE) domain to simulate
the activation and
deactivation of some mobile network elements. A traffic source following th
e Erlang traffic model
(exponentially distributed inter-arrival as well as service times and an in
finite user pool) drives the
simulation. Since the DE-domain of the PtolemyII 0.2 release does not suppo
rt mutations in the
topology so far, five network elements are hardwired into the topology. The
simulation's topology is
shown at the bottom of that page. A configuration manager receives the on/o
ff messages from the
traffic source and activates or deactivates the network elements. The point
s in time when a network
element is activated as well as the service times are depicted in the timep
lot.
Once a network element is activated, it asks the base station for a resourc
e. This communication is
done through the channel. As long as the base station still has resources a
vailable, it gives one to the
quering network element. The number of resources as well as the parameter o
f the traffic model can
be set.
If the service time of the network element is over, it returns the resource
to the base station by
sending messages through the channel. Then, the network element is deactiva
ted.
There are no animations with this demo, but some textual outputs of what is
going in the network
are written in the Java console. The first number in each line is always th
e current time.
Play with the parameters. If you especially vary the number of resources vs
. the traffic load,
you 'll see more or less network elements getting resources or not. The hig
her the traffic load (the
lower the mean arrival time and/or the higher the mean service time) the mo
re resources are needed
in a telephone network in order to avoid rejections of service requests.
If the number of resources is set to zero, no network element will get a re
source.
Also, this demo is neither enhanced nor useful. It is just my first working
applet with software from
PtolemyII packages.
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