- 行业: Technology
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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. ...
(1) A perfect matching between vertices of a bipartite graph, that is, a subgraph that pairs every vertex with exactly one other vertex. (2) The problem of finding such a matching.
Industry:Computer science
(1) A solution to an optimization problem which has the minimum (or maximum) value of the objective function. (2) The time, space, resource, etc. complexity of an algorithm which matches the best known lower bound of a problem.
Industry:Computer science
(1) A spatial access method that defines hyperplanes, in addition to the orthogonal dimensions, which node boundaries may parallel. Space is split by hierarchically nested polytopes (multidimensional boxes with nonrectangular sides). The R-tree is a special case that has no additional hyperplanes. (2) A spatial access method that splits space by hierarchically nested polytopes. The R-tree is a special case in which all polytopes are boxes.
Industry:Computer science
(1) A spatial access method that splits space with hierarchically nested, and possibly overlapping, boxes. The tree is height-balanced. (2) A recursion tree.
Industry:Computer science
(1) a structure providing an easily verified bound on the optimal value of an optimization problem. Typically used in the analysis of an approximation algorithm to prove the performance guarantee. (2) a mismatch of two symbols of string y at a distance of d is a "witness" to the fact that in no subject y could occur twice at a distance of exactly d positions (equivalently, that d cannot be a period of y).
Industry:Computer science
(1) A subgraph in which every vertex has a degree at most one. In other words, no two edges share a common vertex. (2) The problem of finding such a subgraph.
Industry:Computer science
(1) A subunit of a unit is not equal to the unit itself. For instance, a proper substring is not the whole string, a proper subset is not the whole set, a proper subgraph is not the whole graph, etc. (2) According to a rule, as in proper coloring.
Industry:Computer science
(1) A tree which is empty. (2) A tree whose leaf nodes all have a null value.
Industry:Computer science
(1) A Turing machine with a small number of states that halts when started with a blank tape, but writes a huge number of non-blanks or takes a huge number of steps. (2) The problem of finding the maximum number of non-blanks written or steps taken for any Turing machines with a given number of states and symbols.
Industry:Computer science
(1) A unit of reference in a data structure. Also called a vertex in graphs and trees. (2) A collection of information which must be kept at a single memory location.
Industry:Computer science
