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In this article we consider the unweighted m-center problem with rectilinear distance. We preent an O(nm–2 log n) algorithm for the m-center problem where m ≥ 4. 相似文献
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Alan Chivers Andrew Lambert James J. Wirtz Paul Watts 《Defense & Security Analysis》1990,6(4):431-437
Encyclopaedia of Modern Air Force Squadrons. By Chris Ashworth. Patrick Stephens, London (1989), ISBN 1-8526-013-6, £19.95
The Future of Sea Power. By Eric Grove. Routledge, London (1990), ISBN 0-415-00482-9, £35.00
Soviet Strategic Interests in the North. By Kirsten Amundsen. Pinter, London (1990), ISBN 0-86187-018-2, £30.00
Soviet Seapower in Northern Waters. Edited by John Skogan and Arne Brundtland. Pinter, London (1990), ISBN 0-86187-038-7, £35.00
Glasnost, Perestroika, and U.S. Defense Spending. By William W. Kaufmann, Brookings Institution, Washington, DC (1990), ISBN 0-8157-4881-7, $8.95
The Educating of Armies. Edited by Michael D. Stephens. Macmillan, London (1989), ISBN 0-333-43447-1, £35.00 相似文献
The Future of Sea Power. By Eric Grove. Routledge, London (1990), ISBN 0-415-00482-9, £35.00
Soviet Strategic Interests in the North. By Kirsten Amundsen. Pinter, London (1990), ISBN 0-86187-018-2, £30.00
Soviet Seapower in Northern Waters. Edited by John Skogan and Arne Brundtland. Pinter, London (1990), ISBN 0-86187-038-7, £35.00
Glasnost, Perestroika, and U.S. Defense Spending. By William W. Kaufmann, Brookings Institution, Washington, DC (1990), ISBN 0-8157-4881-7, $8.95
The Educating of Armies. Edited by Michael D. Stephens. Macmillan, London (1989), ISBN 0-333-43447-1, £35.00 相似文献
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Consider an experiment in which only record-breaking values (e.g., values smaller than all previous ones) are observed. The data available may be represented as X1,K1,X2,K2, …, where X1,X2, … are successive minima and K1,K2, … are the numbers of trials needed to obtain new records. We treat the problem of estimating the mean of an underlying exponential distribution, and we consider both fixed sample size problems and inverse sampling schemes. Under inverse sampling, we demonstrate certain global optimality properties of an estimator based on the “total time on test” statistic. Under random sampling, it is shown than an analogous estimator is consistent, but can be improved for any fixed sample size. 相似文献
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Minimum cardinality set covering problems (MCSCP) tend to be more difficult to solve than weighted set covering problems because the cost or weight associated with each variable is the same. Since MCSCP is NP-complete, large problem instances are commonly solved using some form of a greedy heuristic. In this paper hybrid algorithms are developed and tested against two common forms of the greedy heuristic. Although all the algorithms tested have the same worst case bounds provided by Ho [7], empirical results for 60 large randomly generated problems indicate that one algorithm performed better than the others. 相似文献