- 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. ...
lower bounds on the execution of a computation based on the rate at which information can be accumulated.
Industry:Computer science
Members which are in either set, but not in both. That is, for sets A and B, it is (A - B) ∪ (B - A).
Industry:Computer science
Merge n sorted sequences of different lengths into one output while minimizing reads. Only two sequences can be merged at once. At each step, the two shortest sequences are merged. Formal Definition: Let D=(n<sub>1</sub>, ... , n<sub>k</sub>) be the set of lengths of sequences to be merged. Take the two shortest sequences, n<sub>i</sub>, n<sub>j</sub>∈ D, such that n≥ n<sub>i</sub> and n≥ n<sub>j</sub> ∀ n∈ D. Merge these two sequences. The new set D is D' = (D - (n<sub>i</sub>, n<sub>j</sub>)) ∪ (n<sub>i</sub>+n<sub>j</sub>). Repeat until there is only one sequence.
Industry:Computer science
Merge n sorted streams into one output stream. All the stream heads are compared, and the head with the least key is removed and written to the output. This is repeated until all streams are empty.
Industry:Computer science
Merge n sorted streams into one output stream. To begin the streams are sorted by the value of the head element of each. Then the head of the first stream, which is the least since the streams were sorted, is removed and written to the output. That stream is inserted back into the list of streams according to its new head. Taking the head of the first stream and reinserting that stream is repeated until all elements have been processed. Using linear search to insert a stream into the list, the execution time is Θ(M N) where M is the total number of elements. Keeping the streams in a heap, the execution time is Θ(M log N).
Industry:Computer science
Negated conjunction: 0 NAND 0 = 1, 0 NAND 1 = 1, 1 NAND 0 = 1, 1 NAND 1 = 0.
Industry:Computer science
Negated disjunction: 0 NOR 0 = 1, 0 NOR 1 = 0, 1 NOR 0 = 0, 1 NOR 1 = 0.
Industry:Computer science
Note: Litwin, W. "Virtual hashing: A dynamically changing hashing." Proc. Very Large Data Bases Conf., Berlin, 1978, pages 517-523.
Industry:Computer science
A type of hierarchical hash system which treats a hash as a bit string, and uses a trie for bucket lookup. Its hierarchical nature allows re-hashing to be performed using an incremental operation (done one bucket at a time, as needed). With expandable hashing, time-sensitive applications are less affected by table growth than by standard full-table rehashes.
Industry:Computer science
