Re: Lab meeting next week - reading material

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Posted by Keki Burjorjee on November 07, 2006 at 10:34:35:

In Reply to: Lab meeting next week - reading material posted by Paul Chiusano on November 01, 2006 at 14:15:22:

I won't be able to make it to lab meeting today because I need to work
on my application for a post-doc position at the Santa Fe Institute. Sorry!

- Keki.

DEMO Lab's WWWBoard MSG 3213 wrote:
> Posted by Paul Chiusano ( on November 01, 2006 at
> 14:15:22.
> Hi all,
> We have lab meeting next week on Tuesday at 3:00. Jordan has suggested
> we read and come prepared to discuss a paper by Chris Salzberg which
> appeard in the most recent ALife. Here is the full reference:
> C. Salzberg. From machine and tape to structure and function:
> Formulation of a reflexively computing system, Artificial Life
> 12(4):487-512, 2006.
> And the pdf is at:
> The paper describes an alternate model of computation (called
> 'reflexive computing') which gets away from the usual 'machine and
> tape' Turing-machine paradigm, and which might make for a better
> ALife/EC substrate than other models of computation that people have
> used in the past. (If you saw Charled Ofria's talk, you'll recall that
> the 'organisms' were sequences of assembly instructions!) So far I've
> just read part of the introduction, but it looks interesting.
> Here is the abstract:
> The relationship between structure and function is explored via a
> system of labeled directed graph
> structures upon which a single elementary read/write rule is applied
> locally. Boundaries between static (information carrying) and active
> (information processing) objects, imposed by mandate of the rules or
> physics in earlier models, emerge instead as a result of a
> structure-function dynamic that is reflexive: objects may operate
> directly on their own structure. Representation of an arbitrary Turing
> Machine is reproduced in terms of structural constraints by means of a
> simple mapping from tape squares and machine states to a uniform
> medium of nodes and links, establishing computation universality.
> Exploiting flexibility of the formulation, examples of other
> unconventional "self-computing" structures are demonstrated. A
> straightforward representation of a kinematic machine system based on
> the model devised by Laing [25, 26, 27] is also reproduced in detail.
> Implications of the findings are discussed in terms of their relation
> to other formal models of computation and construction. It is argued
> that reflexivity of the structure-function relationship is a critical
> informational dynamic in biochemical systems, overlooked in previous
> models but well-captured by the proposed formulation.
> Best,
> Paul
> PS:
> Jordan, I hope you don't mind, I just went and found the paper myself
> and sent this out...
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