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fullname: Bj�rn Grossmann
userid: GROSSMANN
mail: CENSORED
homepage:
why:
As part of my master thesis in mathematics, I am develloping a
bundle of modules that allow conversion of System Dynamics models
created in Stella to any target language. I am currently supporting
C, Java, Matlab and Perl. This allows you to run your model (much)
faster and to plugin libraries, such as optimization algorithms in
order to find values for policy parameters for which an objective
functions from within the model reaches a global optimum. I have
seperated the part the parses the (Stella) model and the part that
does the output (in Perl, C, Java, etc.), so that it should be easy
to add code that allows parsing of models written in other
environments such as Powersim or Vensim. Adding additional output
languages is very straight forward, all you need to do, is to
subclass a class responsible for output and overwrite some methods
specifying how the code should look like in your language of choice.
For those of you, who are wondering what System Dynamics is, you
might want to have a look at http://www.systemdynamics.org/
An excerpt: "System dynamics is a methodology for studying and
managing complex feedback systems, such as one finds in business and
other social systems. In fact it has been used to address
practically every sort of feedback system. While the word system has
been applied to all sorts of situations, feedback is the
differentiating descriptor here. Feedback refers to the situation of
X affecting Y and Y in turn affecting X perhaps through a chain of
causes and effects. One cannot study the link between X and Y and,
independently, the link between Y and X and predict how the system
will behave. Only the study of the whole system as a feedback system
will lead to correct results."
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