Výsledky vyhledávání - Combinatorics and discrete structures related to algorithms

Optimal Join Algorithms Meet Top- k Autor Tziavelis, Nikolaos, Gatterbauer, Wolfgang, Riedewald, Mirek

“… While some optimality results exist, e.g., the famous Threshold Algorithm, they hold only in a fairly limited model of computation that does not account for the cost incurred by large intermediate results and hence is not aligned…”
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Kernel bounds for disjoint cycles and disjoint paths Autor Bodlaender, Hans L., Thomassé, Stéphan, Yeo, Anders

“…In this paper, we show that the problems Disjoint Cycles and Disjoint Paths do not have polynomial kernels, unless N P ⊆ c o N P / p o l y . Thus, these…”
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A study of algorithms relating distributive lattices, median graphs, and Formal Concept Analysis Autor Gély, Alain, Couceiro, Miguel, Miclet, Laurent, Napoli, Amedeo

“…In this paper, we study structures such as distributive lattices, distributive semilattices, and median graphs from an algorithmic point of view…”
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The RED-BLUE SEPARATION problem on graphs Autor Dev, Subhadeep Ranjan, Dey, Sanjana, Foucaud, Florent, Klasing, Ralf, Lehtilä, Tuomo

“…We introduce the Red-Blue Separation problem on graphs, where we are given a graph G=(V,E) whose vertices are colored either red or blue, and we want to select…”
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First-order logic axiomatization of metric graph theory Autor Chalopin, Jérémie, Changat, Manoj, Chepoi, Victor, Jacob, Jeny

“…The main goal of this note is to provide a First-Order Logic with Betweenness (FOLB) axiomatization of the main classes of graphs occurring in Metric Graph…”
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Enumeration of irredundant forests Autor Ingels, Florian, Azaïs, Romain

“…Reverse search is a convenient method for enumerating structured objects, that can be used both to address theoretical issues and to solve data mining…”
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Endhered Patterns in Matchings and RNA Autor Biane, Célia, Hampikian, Greg, Kirgizov, Sergey, Nurligareev, Khaydar

“…) RNA structures with pseudoknots. We present combinatorial results related to the distribution and asymptotic behavior of the pattern 21, which corresponds to two consecutive base pairs frequently encountered in RNA, and the pattern…”
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Faster parameterized algorithms for minor containment Autor Adler, Isolde, Dorn, Frederic, Fomin, Fedor V., Sau, Ignasi, Thilikos, Dimitrios M.

“… The derivation of a polynomial-time algorithm for H - Minor containment is one of the most important and technical parts of the Graph Minor Theory of Robertson and Seymour and it is…”
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Approximation of max independent set, min vertex cover and related problems by moderately exponential algorithms Autor Bourgeois, Nicolas, Escoffier, Bruno, Paschos, Vangelis Th

“…Using ideas and results from polynomial time approximation and exact computation we design approximation algorithms for several NP-hard combinatorial problems achieving ratios that cannot be achieved in polynomial time…”
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On the heapability of finite partial orders Autor Balogh, János, Bonchiş, Cosmin, Diniş, Diana, Istrate, Gabriel, Todinca, Ioan

“… We prove a characterization result reminiscent of the proof of Dilworth's theorem, which yields as a byproduct a flow-based algorithm for computing such a minimal decomposition…”
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Synchronizing production planning and job scheduling: MILP models and exact algorithms Autor Mombelli, Aurélien, Quilliot, Alain

“…We address the synchronization of a resource production process with the consumption of related resources by jobs…”
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Approximation algorithms for the single allocation problem in hub-and-spoke networks and related metric labeling problems Autor Iwasa, Masaru, Saito, Hiroo, Matsui, Tomomi

“…This paper deals with a single allocation problem in hub-and-spoke networks. We present a simple deterministic 3-approximation algorithm and randomized…”
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The Implementation of the Colored Abstract Simplicial Complex and its Application to Mesh Generation Autor Lee, Christopher T, Moody, John B, Amaro, Rommie E, McCammon, J Andrew, Holst, Michael J

“… We present the innovations and design principles of the data structure and related algorithms…”
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Complexity results related to monophonic convexity Autor Dourado, Mitre C., Protti, Fábio, Szwarcfiter, Jayme L.

“…The study of monophonic convexity is based on the family of induced paths of a graph. The closure of a subset X of vertices, in this case, contains every…”
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Aspects of predication and their influence on reasoning about logic in discrete mathematics Autor Dawkins, Paul Christian, Roh, Kyeong Hah

“… We argue these are consequential for how students make sense of discrete mathematics proofs related to the properties and how they construct a logical structure…”
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Lattice paths with catastrophes Autor Banderier, Cyril, Wallner, Michael

“… Furthermore, we prove several formulae for related combinatorial structures conjectured in the On-Line Encyclopedia of Integer Sequences. Thanks to the kernel method and via analytic combinatorics, we provide the enumeration and limit laws of these "lattice paths with catastrophes" for any finite set of jumps. We end with an algorithm to generate such lattice paths uniformly at random. Comment: 32 pages…”
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Open problems around exact algorithms Autor Woeginger, Gerhard J.

“… We summarize what is known on these problems, we discuss related results, and we provide pointers to the literature…”
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Deletion in Abstract Voronoi Diagrams in Expected Linear Time and Related Problems Autor Junginger, Kolja, Papadopoulou, Evanthia

“…; similarly, for any concrete Voronoi diagram of generalized (non-point) sites. In this paper we present a simple, expected linear-time algorithm to update an abstract Voronoi diagram after deletion of one site…”
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Efficient pricing of discrete Asian options Autor Hsu, William W.Y., Lyuu, Yuh-Dauh

“… The algorithm proposed can also be applied to floating-strike Asian options as well because fixed-strike and floating-strike Asian options are related through an equation…”
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Risk prediction of hypertension complications based on the intelligent algorithm optimized Bayesian network Autor Du, Gang, Liang, Xi, Ouyang, Xiaoling, Wang, Chunming

“… of hypertension complications by text mining. On this basis, the K2 algorithm based on the improved particle swarm optimization was proposed to optimize the structure of the Bayesian network (BN…”
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