
Accession Number : AD0677759
Title : SYNCHRONIZATION AND DECOMPOSITION OF FINITE AUTOMATA.
Descriptive Note : Interim rept.,
Corporate Author : MICHIGAN STATE UNIV EAST LANSING DIV OF ENGINEERING RESEARCH
Personal Author(s) : Cutlip,W. F. ; Kilmer,W. L.
Report Date : 31 AUG 1968
Pagination or Media Count : 97
Abstract : An input sequence x synchronizes a finite automation A if the state of A after receiving x is independent of the state of A before receiving x. The automaton A is synchronizable if such a sequence x exists. The questions of synchronizability and properties of the set of synchronizing sequences, both for arbitrary and particular classes of automata, motivate much of the present work. The homing and distinguishing problems are briefly discussed, with references to some of the related published research. The set of tapes which synchronize a purely kdefinite automaton is characterized. This characterization is shown to carry over, but with a quite different proof, to ultimatedefinite automata; and it is shown that every ultimatedefinite automaton is synchronizable. Synchronization of reverse ultimatedefinite automata is investigated, and a characterization is obtained for the synchronizing sequences of a subclass of such machines. Zeiger's procedure for decomposing a finite automaton into a cascade of permutationreset machines is reviewed. Several flaws in the procedure are illustrated by examples and then remedied. It is shown that an automaton A is definite if and only if any Zeiger decomposition of A is a cascade of reset machines. (Author)
Descriptors : (*AUTOMATA, *SYNCHRONIZATION(ELECTRONICS)), COMPUTER LOGIC, SEQUENCES(MATHEMATICS), COMBINATORIAL ANALYSIS, SET THEORY, THEOREMS, THESES
Subject Categories : Bionics
Distribution Statement : APPROVED FOR PUBLIC RELEASE