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Topic: Actor model theory


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In the News (Sun 27 May 12)

  
  Actor model implementation - Wikipedia, the free encyclopedia
In computer science, Actor model implementation concerns implementation issues for the Actor model.
This computational model is reflected in the hardware structure and operating system, and is also the explicit message passing communication seen by the programmer.
Concurrent Smallltalk (which can be modeled using Actors) was developed to program the J Machine.
en.wikipedia.org /wiki/Actor_model_implementation   (1145 words)

  
 Actor model - Wikipedia, the free encyclopedia
The Actor model has been used both as a framework within which to develop a theoretical understanding of concurrency, and as the theoretical basis for several practical implementations of concurrent systems.
The Actor model differs from previous models of computation in that the Actor model was inspired by the laws of physics (physical laws).
Actor creation plus the inclusion of the addresses of Actors in messages means that Actors have a potentially variable topology in their relationship to one another much as the objects in Simula also had a variable topology in their relationship to one another.
en.wikipedia.org /wiki/Actor_model#endnote_Hewitt_-   (4945 words)

  
 More on Model Theory
In mathematics, model theory is the study of the representation of mathematical concepts in terms of set theory, or the study of the models which underlie mathematical systems.
In the context of proof theory the analogous statement is trivial, since every proof can have only a finite number of antecedents used in the proof; in the context of model theory however, this proof is somewhat more difficult.
Model theory is usually concerned with first order logic and many important results (such as the completeness and compactness theorems) fail in second order logic or other alternatives.
www.artilifes.com /model-theory.htm   (1072 words)

  
 CATASTROPHE THEORY MODEL OF THE CONFLICT HELIX
This is a fundamental assumption in the helix and for the catastrophe model.
It should be clear that Figure 5 is a (to borrow the label often applied to topology) rubber sheet model, and that the actual position and rotation of a cusp for the history of a specific dyad may differ considerably from the picture.
This is because the random sample (from a population) model is inappropriate, as is the combinatorial model (where the results are conceived of as one possible random combination among all the possible combinations of the given data).
www.hawaii.edu /powerkills/CAT.ART.HTM   (8805 words)

  
 Actor - TunesWiki
The term for a paradigm of programming which models computations with concurrent (possibly transparently-distributed) entities, the Actors, that communicate with asynchronous messages; Actors may update their behaviour depending on the messages they receive.
Actors have been rediscovered twenty years later by formal-methods people, yielding the very cleanly formalized join calculus.
Actors are what Alan Kay had in mind but couldn't initially achieve when inventing the object-oriented paradigm.
tunes.org /wiki/Actor   (633 words)

  
 Felix Stalder: Actor-Network-Theory and Communication Networks
The theory's aim is to describe a society of humans and non-humans as equal actors tied together into networks built and maintained in order to achieve a particular goal, for example the development of a product.
Actors are isomorphic, which means their size and shape is not a priori but the result of a long development.
Actors and networks are mutually constitutive in the sense that a network shapes and defines the actors who align themselves into a network.
felix.openflows.org /html/Network_Theory.html   (11107 words)

  
 [No title]
Actors' identities and qualities are defined during negotiations between representatives of human and non-human actants.
Bruno Latour recognized that semiotically both human actors and nonhuman participants (whether artifacts or naturalized constructs like bacteria) were equally actants in the sense of Greimas' narrative semiotics: they were defined by how they acted and were acted on in the networks of practices.
ANT is based on no stable theory of the actor; in other words, it assumes the radical indeterminacy of the actor.
carbon.cudenver.edu /~mryder/itc_data/ant_dff.html   (1941 words)

  
 Luboš Motl's reference frame: Littlest Higgs model & deconstruction
It is a procedure to construct theories that behave as theories with extra dimensions (something that the authors considered mostly because of the inspiration coming from string theory), but these dimensions are fake or discrete ones.
Although these six-dimensional theories were always very mysterious and no simple "Lagrangian" description is available, we can define them as pretty ordinary four-dimensional gauge theories with a lattice-like quiver diagram in the limit in which the vevs and the density of the quiver diagram goes to infinity in the right ways.
The reason why many quantum field theories are similar to some string theory models is because string theories predict an astronomical number of models corresponding to different compactifications over various manifolds/orbifolds/conifolds/etc. with various brane properties.
motls.blogspot.com /2005/03/littlest-higgs-model-deconstruction.html   (6665 words)

  
 Academic Economics
Models of inefficient political failure have been criticized for implicitly assuming the irrationality of voters.
Economic models of politics typically make two assumptions about voters: First, their motives are egocentric, not sociotropic; second, their beliefs are rational, not subject to systematic bias.
The paper develops an economic-political model to explain why the convergence hypothesis fails even though good economic policies seem to be a sufficient condition for strong economic growth.
www.gmu.edu /departments/economics/bcaplan/econ.html   (3224 words)

  
 Concurrent Object-Oriented Programming in Act 1   (Site not responding. Last check: 2007-10-10)
In an actor system, the user may always add a new actor with the same message passing behavior, but perhaps with a different internal implementation, and the new actor will appear identical to the old one as far as an users are concerned.
The fact that actors are defined only by their behavior in response to messages is important because it allows many different implementations of the same concept to co-exist in a single system.
There are a set of actors called rock-bottom actors which are allowed to cheat on the actor model and use the primitive data and procedures of the implementation language.
agents.www.media.mit.edu /people/lieber/Lieberary/OOP/Act-1/Concurrent-OOP-in-Act-1.html   (10563 words)

  
 The whole model - this is it   (Site not responding. Last check: 2007-10-10)
The model instantly ceases to be a broad overview or comparative panoply, and starts to be a diagnostic or description of a real play-experience among real people.
This write up does most (or at least some) of this very well already--separating them formally would help to see what pieces are seen as theory and what pieces are seen as ramification or utility (I see the mxing of these as a major stumbling block to the understanding of GNS as a whole).
That said, I agree with Chris that it'd be nice to see the entire theory no longer be called "the GNS model" since, well, the name itself brings an unhealthy amount of focus on that one part of the model...
www.indie-rpgs.com /viewtopic.php?t=8655   (7514 words)

  
 INF5010: Actor-Network Theory
Even quantum mechanics supports this view, since no other physical theory has ever been shown to be accurate to so many decimal places.
It should also be noted that theories are underdetermined with respect to data: this means that any given set of experiments can always be explained in more than one way.
An important point about successive paradigms follows from this, that they are incomparable, in the sense that using the values of one paradigm to criticize another is going to give misleading results at best, and in general is just plain wrong.
folk.uio.no /almira/in-sats/7.shtml   (1003 words)

  
 Rational Choice and Deterrence Theory
Positivist research on the external (social, psychological, and biological) "causes" of crime focused attention on the factors that impose upon and constrain the rational choice of individual actors.
Although specific individuals become the object of enforcement activities, general deterrence theory focuses on reducing the probability of deviance in the general population.
Retributive Theory and Just Desert: Simply put, if criminals and deviants choose to engage in their disruptive and threatening behaviors, they deserve to be punished.
www.umsl.edu /~rkeel/200/ratchoc.html   (1371 words)

  
 Actors: Foundations for Open Systems
Actors as a whole is a clean formal model of capability computation, as well as distributed event loop computation.
The acquaintances of an actor can increase over its previous acquaintances only by the acquaintances of the messengers which it receives and the actors which it creates.
The actor message passing model can be used as the foundation for formalisms (such as Strong Dependency [45]) for describing information transmission in computational systems and for proving that information is not transmitted over certain paths.
www.erights.org /history/actors.html   (647 words)

  
 Metaphor, Morality, and Politics
In the Strict Father model of the family, the mother is subordinated to running the day-to-day affairs of the home and raising the children according to the father's direction.
The Strict Father model of the family, the metaphors that are induced by it, and the Nation-as-Family metaphor jointly provide an explanation for why conservatives have the collection of political positions that they have.
It is the Strict Father model of the family that, under the ubiquitous Nation-as-Family metaphor, gives rise to the resentment of government "meddling" and the conservative hatred of government, and it is the application of discipline and denial in child rearing that produces conservative rage.
www.wwcd.org /issues/Lakoff.html   (10788 words)

  
 Faculty Profile for Kristen R. Monroe
Her current research, focused on rational actor theory and altruism, is explored in two books.
Her narrative analysis of interviews with entrepreneurs, the quintessential rational actors, is contrasted with interviews with philanthropists, recipients of the Carnegie Hero Commission Award, and rescuers of jews in Nazi Europe.
Her current research continues the extent to which identity and perceptions of our self in relation to others sets and delineates moral choice, a topic she is continuing through a contrast of rescuers, bystanders and Nazis during World War II.
www.faculty.uci.edu /profile.cfm?faculty_id=4880&term_list=monroe   (1252 words)

  
 Towards a Theory of Actor Computation (ResearchIndex)   (Site not responding. Last check: 2007-10-10)
Abstract:) Gul Agha University of Illinois agha@cs.uiuc.edu Ian A. Mason Stanford University iam@cs.stanford.edu Scott Smith Johns Hopkins University scott@cs.jhu.edu Carolyn Talcott Stanford University clt@sail.stanford.edu Abstract In this paper we present preliminary results of a rigorous development of the actor model of computation.
We present an actor language which is an extension of a simple functional language, and provide a precise operational semantics for this extension.
668 Actors: A Model of Concurrent Computation in Distributed Sys..
citeseer.ist.psu.edu /89750.html   (308 words)

  
 [No title]   (Site not responding. Last check: 2007-10-10)
Computerized Baggage Handling System failure using both the traditional four factor escalation theory model and Actor-Network Theory’s (ANT) translation stage.
This paper proposes an integrated view of the two theoretical approaches by examining the relationships between the four elements of Actor-Network Theory’s translation stage and the four factors (project, psychological, social, and organizational) of the traditional escalation theory model.
This paper reports on research-in-progress to develop an instrument to measure the outcomes of the problematization, interessement, enrollment, and mobilization stages.
users.moscow.com /kitscott/my_research.html   (398 words)

  
 Paul Buceta - Actor Model Photographer
Memo to all you Burns fans: Complain all you want, but anyone who can do a movie with Angelina Jolie and manage to create NO heat or chemistry is not so much an actor as they are an actor-sized mannequin made of meat loaf.
Foley's strength as a director seems to be working with lots of swearing and coaxing solid performances out of wooden, uninteresting actors.
An aside: I actually have a theory that Baldwin, Burns, and Bill Pullman are all the same actor.
www.paulbuceta.com /main/movies/movies20030917confidence.html   (1435 words)

  
 The Political Economy of Terrorism - Cambridge University Press   (Site not responding. Last check: 2007-10-10)
"The Political Economy of Terrorism is the first comprehensive treatment of terrorism that integrates game theory with a statistical analysis of data on terrorists behavior.
Enders and Sandler have studied this problem for a number of years and provide a clear and insightful analysis of the challenges that we face in developing policies for addressing terrorism.
It contains a wealth of information, both factual and analytical, about terrorism, and it uses a variety of analytical techniques to study the subject from the vantage point of both terrorists and those seeking to contain them, including the rational actor model, game theory, and statistical analysis.
www.cambridge.org /us/catalogue/catalogue.asp?isbn=0521851009   (377 words)

  
 Paul Buceta - Actor Model Photographer
Apparently the set designers firmly believed in the "random flashy lights" theory of Sci Fi set design.
And a big part of the effectiveness of the film is the cast, which is excellent.
In addition to the aforementioned actors, there's also Harry Dean Stanton and Yaphet Kotto...so you've got an entire cast of quality character actors, which you sadly don't see in this type of movie any more.
www.paulbuceta.com /main/movies/movies20031102alien.html   (1415 words)

  
 discount Windows and Dos software and old computer games and hardware
Incredibly nice Bible stories and narration performed on location in the Holy Land by the famous actor.
This software has beautiful photos, video segments, music, artwork, maps and 3-D animations which really makes for an excellent faith-promoting multimedia CD experience.
These modems have the number MW560CI on them which we believe is the model number of the modem.
www.oldsoftware.com /ibm.html   (6357 words)

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