Evolution in asynchronous cellular automata
ICAL 2003 Proceedings of the eighth international conference on Artificial life
Construction universality in purely asynchronous cellular automata
Journal of Computer and System Sciences
Exploring the interdisciplinary connections of gossip-based systems
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Hardware Implementation of Skeletonization Algorithm for Parallel Asynchronous Image Processing
Journal of Signal Processing Systems
Hardware implementation of 3d self-replication
ICES'05 Proceedings of the 6th international conference on Evolvable Systems: from Biology to Hardware
Self-replication, evolvability and asynchronicity in stochastic worlds
SAGA'05 Proceedings of the Third international conference on StochasticAlgorithms: foundations and applications
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Building on the work of Von Neumann, Burks, Codd, and Langton, among others, we introduce the first examples of asynchronous self-reproduction in cellular automata. Reliance on a global synchronous update signal has been a limitation of all solutions since the problem of achieving self-production in cellular automata was first attacked by Von Neumann half a century ago. Our results obviate the need for this restriction.We introduce a simple constructive mechanism to transform any cellular automata network with synchronous update into one with the same behavior but whose cells may be updated randomly and asynchronously. This is achieved by introduction of a synchronization substratum which locally keeps track of the passage of time in a local neighborhood in a manner that keeps all cells locally in-step.The generality of this mechanism is guaranteed by a general mathematical theorem (due to the author) that allows any synchronous cellular automata configuration and rule to be realized asynchronously in such a way the the behavior of the original synchronous cellular automata can be recovered from that of the corresponding asynchronous cellular automaton. Thus all important results on self-reproduction, universal computation, and universal construction, and evolution in populations of self-reproducing configurations in cellular automata that have been obtained in the past carry over to the asynchronous domain.