15 August 2012

New Faculty Position

I started this semester in a new faculty position.  I am an Assistant Professor, in the School of Computer Science, at Columbus State University.  This is a tenure track position, and I am responsible for teaching the graduate level courses in the Modeling and Simulation program.  I am also to serve as the director of the GEMS-R (Gaming, Education, Modeling & Simulation, and Robotics) Institute - a research center affiliated with the School of Computer Science.

This is great, and exactly what I have been working for the past couple of years.  I now hope to really start developing some of my own research ideas, especially in the areas of what it means for a model to have semantic value - epistemologically, teleologically, or simply semiotically.

21 June 2012

Cooperative species

Nice little review of a 2011 book that uses game theory and agent based modeling to show the gregarious side of human nature (how we not only can profit from being in groups, but how there are certain situations where group involvement is the only option)


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21 March 2012

Semantic Similarity

http://www.similarity-blog.de/publications/ Very exciting list of references and publications on Semantic Similarity. Tags: ,

07 June 2011

Epistemology of models - and their output

So when we have a model of some natural phenomena, what can we say about the results? Some amateur philosophical observations . . .

First, the model is a rational construct. It may be inspired or motivated by empirical observations of the referent it is abstracting, but the model in the end is a rational construct. That means it involves all of the limits of such constructs - such as limited view of the referent, perspective driven evaluation of possibilities, and so on.

Second, the access to results of the model involve using empirical observations of the operation of the model. So this is empiricism based on rationalism.

Or is it? What if the model is considered as a rational construct of a generative item? Still a rational construct, but designed to also create rational constructs - meaning the results of the model (which can be many things - models have many possible degrees of freedom as output.

So what does this say about the epistemology of model results? Do they represent some possible (possibly counterfactual?) version of "the original" the model is inspired by (the referent)? Not precisely. I believe they are nothing more than the rational output of a rational construct, but they are inspired by the referent. Within certain identified bounded differences, they can serve as an abstraction for study or to reveal certain behavioral phenomena - but they are not epistemologically equivalent. More thoughts later.

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27 April 2010

Simulation as a Symbol of Meaning

These are a couple of board captures from a recent conversation on the relationship between the Semiotic Triangle (or Triangle of Reference) and the effort of representing some referent within a simulation (by first modeling it).

If the referent is the original object, in ideal form (whatever that is - meaning that all perceptions bring prejudice, so that in a Hume-like sense we can never know the ideal form, only our perceptions of the form), then a model of that referent is a conceptualization of it (much in the way that we talk about conceptual models as the blueprint for data modeling, and that an ontological representation is the expression of a conceptualization). By going one step further, and expressing that model in a simulation that mimics the dynamic existence of the referent (albeit, in some abstracted way - such as in a computer simulation), then the simulation becomes the expressed symbol representing the referent.

This highlights two prejudices that I (and others at the VMASC research group I interact with) have, namely that the act of going from referent to simulation really encompasses two different paradigms - the modeling paradigm (where we seek to understand the referent, in terms of some theory or model), and the simulation paradigm where that model (or theory) is then given form in a method that can give it dynamic existence (life?) over time, taking some inputs as the initial state of that "life", follow the strictures of the model (theory) and progress the processes of the model over time to induce changes to the objects and relations amongst those objects.

An interesting idea, if only because it implies that a simulation is a symbol for some referent. Much as a word (in natural language) is a symbol for some referent.

This reliance on the earliest version of the semiotic triangle leaves out an important stage in the transference of meaning from one agent to another - and that is understanding (or, more formally, in the domain of M&S, the agreement of one model with another).

Regardless of the flaws, the triangle is an interesting tool in understanding what is "modeling and simulation". And it can be seen (from the diagrams following) that there is some effort at reimposing the triangle on each of the vertical arms of the original triangle - (1) going from referent to model, and (2) going from model to simulation. An interesting theory like the triangle of reference is always coming up again and again the more you consider it in additional contexts...

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02 April 2010

primitives of meaning - meet bundle theory

My idea of primitives of meaning to describe a conceptual entity (by identifying all of the atomic concepts that combine to make the "whole" entity) is essentially the same as bundle theory, but I was (sadly) unaware of that theory when I did my writing on the atomic-concept based ontology for modeling and simulation (2005-2006) that led to my master's theory.

For a brief introduction to Bundle Theory see this wikipedia entry.

One of the things that Included in my model of an ontology for modeled worlds, is that the components are (1) concepts, (2) entities which are a combination of a set of concepts, (3) relationships between concepts, (4) rules determining under what conditions the relationships are valid. This is a system that is vulnerable to the same complaints about compresence that bundle theory is vulnerable to. However, since my theory is to apply to a modeled world that can be expressed, I don't think that the language/reality vulnerability of bundle theory applies here. By that I mean, since the point of my ontology theory is to provide an ontology for expressing the meaning of a world that can be expressed in a human generated artifact, an artifact about which questions concerning the described world are decidable, then the number and nature of relationships between (what I call) entities and their bundled concepts is countable and finite. But I may be wrong. :)


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20 October 2009

Modeling paradigms for modeling the Ontological elements of a PMESII environment

In appendix C of Behavioral Modeling and Simulation: From Individuals to Societies there is a decent overview of some modeling techniques to capture PMESII factors.

These approaches/techniques include:
Concept Maps
Concept Graphs
Social Networks
Casual Graphs
Systems Dynamics Model
Neural Networks
Situation Theory

The link above gives a nice reference to particular appendix, or the book is available for browsing here:


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