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Melisew Tefera Belachew Nicolas Gillis 《Journal of Optimization Theory and Applications》2017,173(1):279-296
Finding complete subgraphs in a graph, that is, cliques, is a key problem and has many real-world applications, e.g., finding communities in social networks, clustering gene expression data, modeling ecological niches in food webs, and describing chemicals in a substance. The problem of finding the largest clique in a graph is a well-known difficult combinatorial optimization problem and is called the maximum clique problem. In this paper, we formulate a very convenient continuous characterization of the maximum clique problem based on the symmetric rank-one non-negative approximation of a given matrix and build a one-to-one correspondence between stationary points of our formulation and cliques of a given graph. In particular, we show that the local (resp. global) minima of the continuous problem corresponds to the maximal (resp. maximum) cliques of the given graph. We also propose a new and efficient clique finding algorithm based on our continuous formulation and test it on the DIMACS data sets to show that the new algorithm outperforms other existing algorithms based on the Motzkin–Straus formulation and can compete with a sophisticated combinatorial heuristic. 相似文献
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Kassa Adamu Esubalew Shibeshi Nurelegne Tefera Tizazu Belachew Zegale 《Journal of Thermal Analysis and Calorimetry》2022,147(22):12837-12853
Journal of Thermal Analysis and Calorimetry - The calcination process is the dehydroxylation reaction of the kaolinite mineral into the formation of amorphous metakaolinite phase. The... 相似文献
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Laurence Borgs Pierre Beukelaers Renaud Vandenbosch Laurent Nguyen Gustave Moonen Pierre Maquet Urs Albrecht Shibeshih Belachew Brigitte Malgrange 《BMC neuroscience》2009,10(1):30
Background
Newborn granule neurons are generated from proliferating neural stem/progenitor cells and integrated into mature synaptic networks in the adult dentate gyrus of the hippocampus. Since light/dark variations of the mitotic index and DNA synthesis occur in many tissues, we wanted to unravel the role of the clock-controlled Period2 gene (mPer2) in timing cell cycle kinetics and neurogenesis in the adult DG. 相似文献5.
Stuart C. Clough John T. Gupton David R. Driscoll Katherine A. Griffin Alisa M. Hewitt Matthew S. Hudson S. Adepeju Ligali Seann P. Mulcahy Matthew N. Roberts Robert B. Miller Tsegahiwot T. Belachew Ivanka D. Kamenova René P.F. Kanters Bradley K. Norwood 《Tetrahedron》2004,60(45):10165-10169
Convenient routes from (Z)-3-aryl-3-chloroenals to (2E,4Z)-5-aryl-5-chloro-2,4-pentadienoates and (2E)-5-aryl-2-penten-4-ynoates are described. The stereochemical assignments are based on NMR spectral data. 相似文献
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