Print

Print


*****  To join INSNA, visit http://www.insna.org  *****

Thank you Martina and all the others who provided valuable feedbacks to me. I
will look into them.

Sincerely,

Choon-Lee

Quoting Martina Morris <[log in to unmask]>:

> *****  To join INSNA, visit http://www.insna.org  *****
>
> There is a reasonably long history of work on dynamic networks, and a
> couple of choices of free public software now available as well.
>
> Two you should consider are Tom Snijder's StOCNET/Sienna packages, and the
> new "statnet" package from the UW network modeling group.  Snijder's
> package uses a windows menu driven interface, so is very easy to work
> with.  "statnet" uses the stat package R as an interface, so is works on
> all platforms.  it's also more flexible and capable of handling larger
> networks, but there is a steeper learning curve if you're not already
> familiar with R.
>
> Both come up first in a google search now, so are easy to find.
>
> best,
> Martina Morris
>
>
>
> On Thu, 20 Jul 2006, David Krackhardt wrote:
>
> > *****  To join INSNA, visit http://www.insna.org  *****
> >
> > Roy (and Chai Choon-Lee),
> >
> > Interesting alternative.  I've been a fan of the systems dynamics models
> for
> > years.  But, I am reminded of two things.  First, the most robust general
> > finding of the systems dynamics literature is that it is the structure (the
> > existence of feedback loops), not the flows or rates, that make a
> substantial
> > difference in the behavior of the model.  This is where SNA can shine.  SD
> > assumes a structure and simulates a result.  SNA can actually explain
> > (predict) the structure, leading to insights into why the critical feedback
> > loops exist (perhaps stochastically).  It can also lead more efficiently to
> > insights about critical nodes (centrality, structural holes, etc.) as a
> > function of the structure.
> >
> > This, however, does not take away from your primary point: SNA more often
> > than not deals with fixed stationary, not dynamic, models.  Which brings me
> > to my second thought: Some networkers have combined both the structural
> > orientation of SNA and the dynamic orientation of simulations.  Foremost
> > among these is Kathleen Carley, in my view.  She has several large scale
> > packages that are built around and calculate network concepts but also use
> > agent modeling techniques to simulate dynamics.  One advantage to her work
> is
> > that she permits the structure itself to be dynamic, depending on the rules
> > that govern the formation and dissolution of network links.  I would
> > recommend considering some of her packages in addition to the MIT-based SD
> > software.  You can find out more about these at her CASOS website; or,
> since
> > she produces stuff so fast I am not sure the website can keep up, perhaps
> you
> > are better off asking her directly ([log in to unmask]).
> >
> > -David
> >
> >
> >
> > --On Thursday, July 20, 2006 9:11 AM +0100 Roy Greenhalgh
> <[log in to unmask]>
> > wrote:
> >
> >> *****  To join INSNA, visit http://www.insna.org  *****
> >>
> >> Dear Chai Choon-Lee
> >>
> >> I would recommend that, rather than pursue an SNA solution (if there is
> >> one), you look at System Dynamics.  This explores the dynamics of flows
> >> and the accumulation and dissipation of resources (or stocks as they are
> >> called) over time. You indicate this is what you are wanting to do.
> >>
> >> There are a number of sftware packages: Stella or IThink, Vensim, and
> >> Powersim are the most popular: the first two are basically the same
> >> product, but are aimed at the schools/education market and the commercial
> >> market respectively.  There are student and run-time only versions from
> >> publisher's web sites.
> >>
> >> THE text at present is Sterman. J, 2000,"Business Dynamics: Systems
> >> Thinking and Modelling for a Complex World", McGraw-Hill.  A more
> >> approachable text is  Maani, K. E. and Cavana, R. Y., 2003, "System
> >> Thinking and Modelling", Pearson Education.  Both books come with CDs
> >> holding models in the various s/w packages as well as run-time versions
> >> of the software.
> >>
> >> And I would recommend, even though it is designed for K12 schools in the
> >> US, the  site www.clexchange.org.  This has some superb introductory
> >> papers, and models showing "simulation" possibly to undergrad level.
> >>
> >> Then you can make an informed decision!
> >>
> >> Best wishes ..
> >>
> >>
> >> Roy Greenhalgh
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> Quoting Chai Choon-Lee <[log in to unmask]>:
> >>
> >>> *****  To join INSNA, visit http://www.insna.org  *****
> >>>
> >>> Hello,
> >>>
> >>> I am new to SNA. I am working on an engineering project that studies the
> >>> interdependency among critical infrastructures, such as electricity,
> >>> water, hospital, telecommunication, power plants, etc. I am exploring
> >>> the  possibility
> >>> of using SNA software to simulate infrastructure interdependency.
> >>>
> >>> Infrastructure interdependency gives rise to an infrastructure
> >>> network. In this
> >>> project, apart from studying the structural characteristics of
> >>> infrastructure network, such as centrality etc., I am wondering if there
> >>> is any SNA software that can be used to simulate, for instance, the
> >>> material/info/energy flows between infrastructures during an
> >>> emergency/disaster situation?
> >>>
> >>> From my shallow reading of SNA, I get a sense that SNA deals less
> >>> with dynamic
> >>> situations where different variables change as time goes by. For
> >>> instance, in a
> >>> disaster situation, medical supplies/hospital beds/food, etc. run down
> >>> as the clock ticks, can we use SNA software to simulate this?
> >>>
> >>> Sorry if my questions sound silly. Thank you for your time.
> >>>
> >>> Sincerely,
> >>>
> >>> Choon-Lee Chai
> >>> Dept of Sociology
> >>> University of Saskatchewan
> >>>
> >>> _____________________________________________________________________
> >>> SOCNET is a service of INSNA, the professional association for social
> >>> network researchers (http://www.insna.org). To unsubscribe, send
> >>> an email message to [log in to unmask] containing the line
> >>> UNSUBSCRIBE SOCNET in the body of the message.
> >>>
> >>
> >> _____________________________________________________________________
> >> SOCNET is a service of INSNA, the professional association for social
> >> network researchers (http://www.insna.org). To unsubscribe, send
> >> an email message to [log in to unmask] containing the line
> >> UNSUBSCRIBE SOCNET in the body of the message.
> >>
> >
> >
> >
> > --------------
> > David Krackhardt, Professor of Organizations, editor of JoSS
> > Heinz School of Public Policy and Management, and
> >   The Tepper School of Business
> > Carnegie Mellon University
> > Pittsburgh, PA 15213
> > 412-268-4758
> > website: www.andrew.cmu.edu/~krack
> >   (Erdos#=2)
> >
> > _____________________________________________________________________
> > SOCNET is a service of INSNA, the professional association for social
> > network researchers (http://www.insna.org). To unsubscribe, send
> > an email message to [log in to unmask] containing the line
> > UNSUBSCRIBE SOCNET in the body of the message.
> >
>
> ****************************************************************
>   Director
>   Center for Studies in Demography and Ecology
>   Box 353412
>   University of Washington
>   Seattle, WA 98195-3412
>
>   Office:	(206) 685-3402
>   Dept Office: 	(206) 616-7743
>   Fax: 		(206) 616-8135
>   http://csde.washington.edu/
>
> [log in to unmask]
> http://faculty.washington.edu/morrism/
>
> _____________________________________________________________________
> SOCNET is a service of INSNA, the professional association for social
> network researchers (http://www.insna.org). To unsubscribe, send
> an email message to [log in to unmask] containing the line
> UNSUBSCRIBE SOCNET in the body of the message.
>

_____________________________________________________________________
SOCNET is a service of INSNA, the professional association for social
network researchers (http://www.insna.org). To unsubscribe, send
an email message to [log in to unmask] containing the line
UNSUBSCRIBE SOCNET in the body of the message.