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Extra resources for Artificial life IX : proceedings of the Ninth International Conference on the Simulation and Synthesis of Artificial Life

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For example, a well-known self-replicating structurc is a Langton's loop constructed in two-dimensional, celFigure 1: 'White cells are destroyed, dark-grey cells form "scaflular space. The loop is a closed data path, capable of transfolding", black cells form the "frame". Boundary links are shown mitting data in the form of signals. These signals not only as white double-lines. encode the loop's "genome", but serve also as the instructions for replication. In executing the instructions the ioop hand, a continuously connected closed impact boundary proextends itself and folds into a daughter loop, also containing vides a template for repair of the impact-surrounding region, the genome and capable of self-replication (Langton, 1984).

The latter is used to manufacture both another Universal Computer and a Universal Constructor. The program fl is then copied into the newly manufactured Universal Computer. It is possible to develop self-replicating automata which do not require universality. For example, a well-known self-replicating structurc is a Langton's loop constructed in two-dimensional, celFigure 1: 'White cells are destroyed, dark-grey cells form "scaflular space. The loop is a closed data path, capable of transfolding", black cells form the "frame".

I..... a..... u a..... a. au i a.. 03e where p = weighted fraction of the goal location covered c = number of blocks inside the model s = number of dispensers assumed e = number of excess blocks beyond those needed u i Figure 7: Evolved replication sequence for the L-morphology. Red: Swivel blocks; Blue: Effector blocks; Gray: New material. Note that the se'uence contains several redundant c cies. Of the three morphologies found by the evolutionary process in the first stage, only two were successful at the second stage, yielding a functional, physically-plausible self-replicating machine.

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