منابع مشابه
A New Upper Bound on 2D Online Bin Packing
Abstract The 2D Online Bin Packing is a fundamental problem in Computer Science and the determination of its asymptotic competitive ratio has attracted great research attention. In a long series of papers, the lower bound of this ratio has been improved from 1.808, 1.856 to 1.907 and its upper bound reduced from 3.25, 3.0625, 2.8596, 2.7834 to 2.66013. In this paper, we rewrite the upper bound ...
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Inversion of magnetic data is an important step towards interpretation of the practical data. Smooth inversion is a common technique for the inversion of data. Physical bound constraint can improve the solution to the magnetic inverse problem. However, how to introduce the bound constraint into the inversion procedure is important. Imposing bound constraint makes the magnetic data inversion a n...
متن کاملAn 8/3 Lower Bound for Online Dynamic Bin Packing
We study the dynamic bin packing problem introduced by Coffman, Garey and Johnson. This problem is a generalization of the bin packing problem in which items may arrive and depart dynamically. The objective is to minimize the maximum number of bins used over all time. The main result is a lower bound of 8/3 ∼ 2.666 on the achievable competitive ratio, improving the best known 2.5 lower bound. T...
متن کاملNew Lower Bound for the Bin Packing Problem
The bin packing problem can be defined as follows: Given a set L of n items i, with sizes wi, for any (1 ≤ i ≤ n) and a set of identical bins with capacity C, with an objective to determine the minimal number of bins necessary to pack all the items, so that the sum of the volumes of the items in the same bin does not exceed the capacity of the bin. The problem has many real-world applications (...
متن کاملA new upper bound for 3-SAT
We show that a randomly chosen 3-CNF formula over n variables with clauses-tovariables ratio at least 4.4898 is asymptotically almost surely unsatisfiable. The previous best such bound, due to Dubois in 1999, was 4.506. The first such bound, independently discovered by many groups of researchers since 1983, was 5.19. Several decreasing values between 5.19 and 4.506 were published in the years b...
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ژورنال
عنوان ژورنال: Discrete & Computational Geometry
سال: 2005
ISSN: 0179-5376,1432-0444
DOI: 10.1007/s00454-005-1178-y