http://friam.383.s1.nabble.com/Nature-Ball-reviews-Miller-Page-and-Epstein-tp524386p524392.html
Hey, how can we get this fellow William I. Newman to do a Wedtech?
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>
>
> On 8/9/07, Marcus G. Daniels <marcus at snoutfarm.com> wrote:
> >
> > Right, "generative social science", a.k.a. "made up stuff"...
>
>
> Speaking of which, for those in the vicinity of Los Alamos:
>
> Thursday, August 9th,2007
> >
> > 4:00 pm - 5:00 pm
> >
> > CNLS Conference Room (TA-3, Bldg 1690)
> >
> > Gang Recruitment and Growth: A Cellular Automata and Directed Graph Approach to
> > the Statistics of Gang Sizes
> >
> >
> > William I. Newman
> > UCLA
> >
> > Cellular automata models can be developed to describe the evolution of emergent
> > dynamical systems that maintain a discrete character, including those with an
> > implicit hierarchical character. Moreover, these models can be related to
> >
> > directed graphs. These methods have found widespread application in condensed
> > matter physics (e.g., diffusion limited aggregation and crystal growth,
> > sandpiles andself-organized criticality) as well as in earth and environmental
> >
> > physics (e.g., models of earthquakes and river networks). In particular, models
> > developed for forest fires are manifestly complex systems that show
> > well-preserved scaling laws relating to the frequency of forest fires relative
> >
> > to their size. In sociological studies of conflict and deadly quarrels, similar
> > statistical scaling laws have been observed, e.g., Richardson, with identical
> > power-law indices. In earlier work, Gabrielov, Newman, and Turcotte (199?)
> >
> > succeeded in deriving from first principles those scaling laws. Here, we show
> > that a simple redefinition of terms makes it possible for the statistics of
> > gangs to be obtained from these other cellular automata models. In particular,
> >
> > by equivalencing the recruitment of gang members in the sociological problem
> > with the planting of trees in the environmental problem, the observed
> > statistics of gang populations and their prevalence can be derived.
> >
> >
> > LANL Host: Mac Hyman, T-7
> >
> >
> >
>
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J. T. Johnson