منابع مشابه
Restricted Science
INTRODUCTION In 2004, the National Science Advisory Board for Biosecurity (NSABB) was created as an independent federal advisory body. Its role was to advise the U.S. government on strategies to prevent the misuse of dual-use research. Since its inception, the NSABB has ruled on two cases: the 1918 flu-virus synthesis conducted by government scientists in 2005 and the H5N1 experiment conducted ...
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There is no need to show the importance of the ltering techniques to solve constraint satisfaction problems i.e. to nd values for problem variables subject to constraints that specify which combinations of values are consistent. They can be used during a preprocessing step to remove once and for all some local inconsistencies, or during the search to eeciently prune the search tree. Recently, i...
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The shortest common superstring and the shortest common supersequence are two well studied problems having a wide range of applications. In this paper we consider both problems with resource constraints, denoted as the Restricted Common Superstring (shortly RCSstr) problem and the Restricted Common Supersequence (shortly RCSseq). In the RCSstr (RCSseq) problem we are given a set S of n strings,...
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We study compositions of the integer n in which the first part, successive differences, and the last part are constrained to lie in prescribed sets L,D,R, respectively. A simple condition on D guarantees that the generating function f(x,L,D,R) has only a simple pole on its circle of convergence and this at r(D), a function independent of L and R. Thus the number of compositions is asymptotic to...
متن کاملRestricted permutations
Restricted permutations are those constrained by having to avoid subsequences ordered in various prescribed ways. They have functioned as a convenient descriptor for several sets of permutations which arise naturally in combinatorics and computer science. We study the partial order on permutations (and more general sequences) that underlies the idea of restriction and which gives rise to sets o...
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ژورنال
عنوان ژورنال: Frontiers in Public Health
سال: 2014
ISSN: 2296-2565
DOI: 10.3389/fpubh.2014.00158