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februari 02, 2004
Complexity Digest
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K. Smith, H. Brighton, S. Kirby
Complex Systems In Language Evolution: The Cultural Emergence.
Abstract:
Language arises from the interaction of three complex adaptive systems - biological evolution, learning, and culture. We focus here on cultural evolution, and present an Iterated Learning Model of the emergence of compositionality, a fundamental structural property of language. Our main result is to show that the poverty of the stimulus available to language learners leads to a pressure for linguistic structure. When there is a bottleneck on cultural transmission, only a language which is generalizable from sparse input data is stable. Language itself evolves on a cultural time-scale, and compositionality is language's adaptation to stimulus poverty.
Stefano Battiston, Gérard Weisbuch, Bonabeau
Decision Spread In The Corporate Board Network (PDF)
Abstract:
Boards of large corporations sharing some of their directors are connected in complex networks. Boards are responsible for corporations long-term strategy and are often involved in decisions about a common topic related to the belief in economical growth or recession.
We are interested in understanding under which conditions a large majority of boards making a same decision can emerge in the network. We present a model where board directors are engaged in a decision making dynamics based on herd behavior . Boards influence each other through shared directors.
We find that imitation of colleagues and opinion bias due to the interlock do not trigger an avalanche of identical decisions over the board network, whereas the information about interlocked boards decisions does. There is no need to invoke global public information, nor external driving forces.
This model provides a simple endogenous mechanism to explain the fact that boards of the largest corporations of a country can, in the span of a few months, take the same decisions about general topics.
Marcel Albers, Catholijn M. Jonker, Mehrzad Karami, Jan Treur
Agent Models And Different User Ontologies For An Electronic Market Place (PDF)
Abstract:
In this paper the agent-based electronic market architecture GEMS is described. The market incoporates different user perspectives: consumers, retailers, and producers. Ontologies for the different user perspectives are included. Knowledge is included to relate information from the different perspectives; for example evaluation knowledge that can be used to derive product evaluations in terms of user ontology from product information based on producer ontology. Agent models are used as a high-level design structure for the architecture. It is shown how this combination of agent models, ontologies and knowledge provides an adequate approach to the distributed and knowledge-intensive character of the application.
Bruce Bower
Sleeper Effects: Slumber may fortify memory, stir insight
There's nothing like a good night's sleep to get some serious thinking done. That, at least, is the theme of two new investigations, one conducted with rodents and the other with people.
Valdis Krebs
Divided We Stand... Still:
Last year I created a network map of political books based on purchase patterns from major web book retailers. The network revealed a divided populace... at least amongst book readers. I was curious to see what, if anything, had changed in the patterns in 2004.
...
It appears that the many of the books have changed from last year but the pattern is the same. Two distinct clusters, with dense internal ties have emerged. These political books are preaching to the converted! T
Posted by hakank at februari 2, 2004 06:56 EM Posted to Agentbaserad modellering | Komplexitet/emergens | Social Network Analysis/Complex Networks