- 行业: Technology
- Number of terms: 2742
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The National Institute of Standards and Technology (NIST) — known between 1901 and 1988 as the National Bureau of Standards (NBS) — is a measurement standards laboratory and a non-regulatory agency of the United States Department of Commerce. The institute's official mission is to promote U.S. ...
An extension of a finite state machine that operates on n-ary constructors. Where a finite state automaton reaches a new state with a single state and character, a tree automaton takes n states and constructors. Tree automata may be top-down (starting from the root) or bottom-up (starting from the leaves), and deterministic or nondeterministic.
Industry:Computer science
An extension or superset of a binary relation such that whenever (a,b) and (b,c) are in the extension, (a,c) is also in the extension.
Industry:Computer science
An external sort algorithm that uses optimal polyphase merges.
Industry:Computer science
An extra tape used by an oracle Turing machine to make decisions otherwise not feasible.
Industry:Computer science
An index into a set of texts of the words in the texts. The index is accessed by some search method. Each index entry gives the word and a list of texts, possibly with locations within the text, where the word occurs.
Industry:Computer science
An index into a set of texts. This is usually created as the first step to making an inverted index.
Industry:Computer science
An initial state or condition of a finite state machine or Turing machine. Informally, how the memory is initially set.
Industry:Computer science
An in-place sort algorithm that repeatedly reorders different pairs of items. On each pass swap pairs of items separated by the increment or gap, if needed, and reduce the gap (divide it by about 1.3). The gap starts at about 3/4 of the number of items. Continue until the gap is 1 and a pass had no swaps.
Industry:Computer science
An in-place sort algorithm that repeatedly reorders different, small subsets of the input until the entire array is ordered. On each pass it handles i sets of n/i items, where n is the total number of items. Each set is every i<sup>th</sup> item, e.g. set 1 is item 1, 1+i, 1+2i, etc., set 2 is item 2, 2+i, etc. On each succeeding pass, the increment or gap, i, is reduced until it is 1 for the last pass.
Industry:Computer science
