6,421 research outputs found
06361 Abstracts Collection -- Computing Media Languages for Space-Oriented Computation
From 03.09.06 to 08.09.06, the Dagstuhl Seminar 06361 ``Computing Media and Languages for Space-Oriented Computation\u27\u27 was held
in the International Conference and Research Center (IBFI),
Schloss Dagstuhl.
During the seminar, several participants presented their current
research, and ongoing work and open problems were discussed. Abstracts of
the presentations given during the seminar as well as abstracts of
seminar results and ideas are put together in this paper. The first section
describes the seminar topics and goals in general.
Links to extended abstracts or full papers are provided, if available
Complexity-Theoretic Aspects of Expanding Cellular Automata
The expanding cellular automata (XCA) variant of cellular automata is
investigated and characterized from a complexity-theoretical standpoint. An XCA
is a one-dimensional cellular automaton which can dynamically create new cells
between existing ones. The respective polynomial-time complexity class is shown
to coincide with , that is, the class of decision
problems polynomial-time truth-table reducible to problems in . An
alternative characterization based on a variant of non-deterministic Turing
machines is also given. In addition, corollaries on select XCA variants are
proven: XCAs with multiple accept and reject states are shown to be
polynomial-time equivalent to the original XCA model. Finally, XCAs with
alternative acceptance conditions are considered and classified in terms of
and the Turing machine polynomial-time class
.Comment: 19 pages, 3 figure
Dagstuhl News January - December 2006
"Dagstuhl News" is a publication edited especially for the members of the Foundation "Informatikzentrum Schloss Dagstuhl" to thank them for their support. The News give a summary of the scientific work being done in Dagstuhl. Each Dagstuhl Seminar is presented by a small abstract describing the contents and scientific highlights of the seminar as well as the perspectives or challenges of the research topic
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