Analisi delle dinamiche di sopravvivenza e proliferazione delle keyword negli articoli scientifici

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(102) Size k out. in. l. real. 8.32. 7.61. 4.77. pow. 8.85. 5.2 7.67 7.47 4.01 1.95 3.86 6.53. l. 6.3 8.75 12.8 3.65 2.12 5.01 8.2. 2.89. rand. 3.32. 1.71 2. l. 2.26 3.23. Albert, Jeong, and Baraba´ si 1999 K umar et al., 1999 Broder et al., 2000 H uberman and A damic, 2000 Faloutsos, 1999 Faloutsos, 1999 Govindan, 2000 Baraba´ si and Albert, 1999 Newman, 2001b Baraba´ si et al., 2001 Baraba´ si et al., 2001 L ilj eros et al., 2001 Jeong et al., 2000 J eong, Mason, et al., 2001 Montoya and Sole´ , 2000 Montoya and Sole´ , 2000 R edner, 1998 A iello et al., 2000 Ferrer i C ancho and Sole´ , 2001 Yook et al., 2001b. Reference. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 14 16 17 18 19 20. Nr.. TABLE II. The scaling exponents characterizing the degree distribution of several scale-free networks, for which P (k) follows a power law (2). We indicate the size of the network, its average degree k , and the cutoff for the power-law scaling. For directed networks we list separately the indegree ( in ) and outdegree ( out ) exponents, while for the undirected networks, marked with an asterisk (*), these values are identical. The columns l real , l rand , and l pow compare the average path lengths of real networks with power-law degree distribution and the predictions of random-graph theory (17) and of Newman, Strogatz, and Watts (2001) [also see Eq. (63) above], as discussed in Sec. V. The numbers in the last column are keyed to the symbols in Figs. 8 and 9. Network. WWW 325 729 4.51 900 2.45 2.1 11.2 WWW 7 2.38 2.1 4 107 WWW 7.5 4000 2.72 2.1 16 2 108 W W W, site 260 000 1.94 Internet, domain * 3015–4389 3.42–3.76 30–40 2.1–2.2 2.1–2.2 4 Internet, router * 3888 2.57 30 2.48 2.48 12.15 150 000 2.66 60 2.4 2.4 11 Internet, router * Movie actors * 212 250 28.78 900 2.3 2.3 4.54 Co-authors, SPIRES * 56 627 173 1100 1.2 1.2 4 209 293 11.54 400 2.1 2.1 6 Co-authors, neuro. * Co-authors, math. * 70 975 3.9 120 2.5 2.5 9.5 2810 3.4 3.4 Sexual contacts* Metabolic, E. coli 778 7.4 110 2.2 2.2 3.2 Protein, S. cerev.* 1870 2.39 2.4 2.4 Ythan estuary * 134 8.7 35 1.05 1.05 2.43 154 4.75 27 1.13 1.13 3.4 Silwood Park * C it a t io n 783 339 8.57 3 Phone call 3.16 2.1 2.1 53 106 Words, co-occurrence * 460 902 70.13 2.7 2.7 Words, synonyms* 22 311 13.48 2.8 2.8. $

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