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The controllability analysis of complex networks is of great importance for modern network science and engineering. Existing research shows that the controllability of a complex network is affected not only by the degree distribution of the network,but also by the degree correlation.Although the effect of degree correlations on the network controllability is well studied for directed networks,it is not yet very clear for the case of undirected networks.To explore the impact of degree correlations on the controllability of undirected networks and their corresponding generalized (bidirectional and directed) networks,in this paper,we use the simulated annealing algorithm to change the network degree correlation coefficients by link rewiring.First,the undirected Erdős-Rényi random network and the modified scale-free network are taken as example models to be investigated.Numerical simulations show that the controllability measure (density of driver nodes) of undirected networks decreases monotonically with the increase of the degree correlation coefficient under a constant degree distribution.Specifically,when the degree correlation coefficient changes from -1 to 0,the controllability measure decreases rapidly;while the decrease in the controllability measure is not obvious when the degree correlation coefficient changes from 0 to 1.Next,the bidirectional networks and some directed networks are considered;in these networks,the in-degree of each node is equal to its out-degree,thus link rewiring results in the simultaneous changes of various degree correlations (i.e.,in-in,in-out,out-in,and out-out degree correlations).Further investigations show that these bidirectional and directed networks also follow the above rule,which is verified by the two real networks.The increase of the degree correlation coefficient in undirected networks also implies the increases of various degree correlation coefficients in the corresponding directed networks.Although the effect of a single degree correlation on the controllability of directed networks is clear,the comprehensive effect of the simultaneous changes in various degree correlations on the network controllability cannot be additively and therefore directly estimated by the relevant results in the corresponding directed networks;namely,the effect of the degree correlation on the controllability in an undirected network has its special rule.Some explanations are given for this phenomenon.Moreover,for a large sparse network without self-loops,no matter how assortative or disassortative it is,its structural controllability and exact controllability are verified to be almost the same.These studies will deepen the understanding of the relationship between the network controllability and the network structure.
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Keywords:
- complex network /
- undirected network /
- controllability /
- degree correlation
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[1] Liu Y Y, Slotine J J, Barabási A L 2011 Nature 473 167
[2] Pósfai M, Liu Y Y, Slotine J J, Barabási A L 2014 J. Univ. Electron. Sci. Technol. China 43 1 (in Chinese)[周涛, 张子柯, 陈关荣, 汪小帆, 史定华, 狄增如, 樊瑛, 方锦清, 韩筱璞, 刘建国, 刘润然, 刘宗华, 陆君安, 吕金虎, 吕琳媛, 荣智海, 汪秉宏, 许小可, 章忠志2014电子科技大学学报43 1]
[3] Ruths J, Ruths D 2014 Science 343 1373
[4] Wuchty S 2014 Proc. Natl. Acad. Sci. U.S.A. 111 7156
[5] Xu M, Xu C Y, Wang H, Deng C Z, Cao K F 2015 Eur. Phys. J. B 88 168
[6] Xu C J, Zheng Y, Su H S, Wang H O 2015 Int. J. Control 88 248
[7] Hou L L, Lao S Y, Xiao Y D, Bai L 2015 Acta Phys. Sin. 64 188901 (in Chinese)[侯绿林, 老松杨, 肖延东, 白亮2015物理学报64 188901]
[8] Nie S, Wang X W, Wang B H 2015 Physica A 436 98
[9] Ruths D, Ruths J 2016 Sci. Rep. 6 19818
[10] Kawakami E, Singh V K, Matsubara K, Ishii T, Matsuoka Y, Hase T, Kulkarni P, Siddiqui K, Kodilkar J, Danve N, Subramanian I, Katoh M, Shimizu-Yoshida Y, Ghosh S, Jere A, Kitano H 2016 NPJ Syst. Biol. Appl. 2 15018
[11] Kalman R E 1963 J. Soc. Ind. Appl. Math. Ser. A 1 152
[12] Lombardi A, Härnquist M 2007 Phys. Rev. E 75 056110
[13] Lin C T 1974 IEEE Trans. Autom. Contr. 19 201
[14] Lovász L, Plummer M D 1986 Matching Theory (Amsterdam:North-Holland) pp83-119
[15] Mézard M, Parisi G 2001 Eur. Phys. J. B 20 217
[16] Hautus M L J 1969 Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen Ser. A 72 443
[17] Wang X F, Chen G R 2002 Physica A 310 521
[18] Zhou M Y, Zhuo Z, Liao H, Fu Z Q, Cai S M 2015 Sci. Rep. 5 17459
[19] Zhou M Y, He X S, Fu Z Q, Liao H, Cai S M, Zhuo Z 2016 Physica A 446 120
[20] Orouskhani Y, Jalili M, Yu X H 2016 Sci. Rep. 6 24252
[21] Newman M E J 2002 Phys. Rev. Lett. 89 208701
[22] Foster J G, Foster D V, Grassberger P, Paczuski M 2010 Proc. Natl. Acad. Sci. U.S.A. 107 10815
[23] Newman M E J 2003 Phys. Rev. E 67 026126
[24] Maslov S, Sneppen K 2002 Science 296 910
[25] Hopcroft J E, Karp R M 1973 SIAM J. Comput. 2 225
[26] Qu J, Wang S J 2015 Acta Phys. Sin. 64 198901 (in Chinese)[屈静, 王圣军2015物理学报64 198901]
[27] Goh K I, Kahng B, Kim D 2001 Phys. Rev. Lett. 87 278701
[28] Kirkpatrick S, Gelatt Jr C D, Vecchi M P 1983 Science 220 671
[29] Newman M E J 2006 Phys. Rev. E 74 036104
[30] Watts D J, Strogatz S H 1998 Nature 393 440
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