/npsi/ctrl?action=rtdoc&an=3540016&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=3540016&lang=frAccess and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1162/106454603321489509Artificial Life, 9, 1, pp. 21-40, 2003 Self-replicating machines in continuous space with virtual physics Smith, Arnold; Turney, Peter; Ewaschuk, Robert Permission is granted to quote short excerpts and to reproduce figures and tables from this report, provided that the source of such material is fully acknowledged. Self-Replicating Machines in Continuous Space with Virtual Physics AbstractJohnnyVon is an implementation of self-replicating machines in continuous twodimensional space. Two types of particles drift about in a virtual liquid. The particles are automata with discrete internal states but continuous external relationships. Their internal states are governed by finite state machines but their external relationships are governed by a simulated physics that includes brownian motion, viscosity, and springlike attractive and repulsive forces. The particles can be assembled into patterns that can encode arbitrary strings of bits. We demonstrate that, if an arbitrary "seed" pattern is put in a "soup" of separate individual particles, the pattern will replicate by assembling the individual particles into copies of itself. We also show that, given sufficient time, a soup of separate individual particles will eventually spontaneously form self-replicating patterns. We discuss the implications of JohnnyVon for research in nanotechnology, theoretical biology, and artificial life.

This demonstration reports on the current stage of development of a web-based environment to support video sharing and annotation. The initial requirements and their implementation are briefly presented. The application is aimed at supporting the professional development of teachers with a multimedia application over a broadband network. However, work with teachers has pointed us to new requirements, differentiating VSA from previous work. Continued work with teachers will lead to further evolution of VSA.

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