摘要：
In this paper we present our study on the critical behavior of a stochastic anisotropic Bak–Sneppen (saBS) model, in which a parameter α is introduced to describe the interaction strength among nearest species. We estimate the threshold fitness f
c
and the critical exponent τ
r
by numerically integrating a master equation for the distribution of avalanche spatial sizes. Other critical exponents are then evaluated from previously known scaling relations. The numerical results are in good agreement with the counterparts yielded by the Monte Carlo simulations. Our results indicate that all saBS models with nonzero interaction strength exhibit self-organized criticality, and fall into the same universality class, by sharing the universal critical exponents.
作者机构：
[Zou, Yijiang; Zhao, Longfeng; Deng, Weibing; Li, Wei; Su, Zhu; Han, Jihui; Han, JH; Li, W] Cent China Normal Univ, Complex Sci Ctr, Wuhan, Hubei, Peoples R China.;[Zou, Yijiang; Zhao, Longfeng; Deng, Weibing; Li, Wei; Su, Zhu; Han, Jihui; Han, JH; Li, W] Cent China Normal Univ, Inst Particle Phys, Wuhan, Hubei, Peoples R China.;[Han, Jihui] Zhengzhou Univ Light Ind, Sch Comp & Commun Engn, Zhengzhou, Henan, Peoples R China.
通讯机构：
[Han, JH; Li, W; Deng, WB] C;[Han, Jihui] Z;Cent China Normal Univ, Complex Sci Ctr, Wuhan, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan, Hubei, Peoples R China.;Zhengzhou Univ Light Ind, Sch Comp & Commun Engn, Zhengzhou, Henan, Peoples R China.
关键词：
Community structure;Network analysis;Algorithms;Internet;Real time computing;Color codes;Food web structure;Neural networks
摘要：
An adaptive label propagation algorithm (ALPA) is proposed to detect and monitor communities in dynamic networks. Unlike the traditional methods by re-computing the whole community decomposition after each modification of the network, ALPA takes into account the information of historical communities and updates its solution according to the network modifications via a local label propagation process, which generally affects only a small portion of the network. This makes it respond to network changes at low computational cost. The effectiveness of ALPA has been tested on both synthetic and real-world networks, which shows that it can successfully identify and track dynamic communities. Moreover, ALPA could detect communities with high quality and accuracy compared to other methods. Therefore, being low-complexity and parameter-free, ALPA is a scalable and promising solution for some real-world applications of community detection in dynamic networks.
期刊：
Journal of Statistical Mechanics: Theory and Experiment,2017年2017(9):093401- ISSN：1742-5468
通讯作者：
Zhu, Yueying
作者机构：
[Zhu, Yueying; Wang, Qiuping Alexandre] Univ Maine, UMR CNRS 6283, IMMM, F-72085 Le Mans, France.;[Zhu, Yueying; Li, Wei; Cai, Xu] Cent China Normal Univ, Complex Sci Ctr, Wuhan 430079, Hubei, Peoples R China.;[Zhu, Yueying; Li, Wei; Cai, Xu] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Wang, Qiuping Alexandre] Yncrea, HEI, F-59014 Lille, France.;[Li, Wei] Max Planck Inst Math Sci, Inselst 22, D-04103 Leipzig, Germany.
通讯机构：
[Zhu, Yueying] U;[Zhu, Yueying] C;Univ Maine, UMR CNRS 6283, IMMM, F-72085 Le Mans, France.;Cent China Normal Univ, Complex Sci Ctr, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.
关键词：
agent-based models;algorithmic game theory;evolutionary game theory;nonlinear dynamics
摘要：
We propose and experimentally demonstrate a novel ring-based wavelength-division-multiplexing passive optical network (WDM-PON). By using an orthogonal coding and correlation technique, the ring-based WDM-PON can efficiently mitigate the optical beat interference noise induced by Rayleigh backscattering. In our proposed orthogonal coding scheme, no extra light sources are required for the upstream (US) transmission, which means the number of light sources can be halved and the saved wavelengths can be used for more optical network units. In addition, compared to previous ring-based WDM-PONs, the proposed ring-based WDM-PON requires fewer fiber Bragg gratings and no blue/red-band filter, which means the proposed orthogonal coding scheme costs less. The performance of the proposed scheme is investigated through an experiment. In the experiment, 2.5 and 5 Gb/s US data rate and 5 Gb/s downstream data rate are investigated in two different ring architectures. According to the experimental results under different situations, it can be concluded that the US orthogonal coding scheme performs better than the normal US on-off keying in a ring-based WDM-PON. The power margin can be up to 1.8 dB when the US data rate is 2.5 Gb/s, and the power margin can be up to 1.69 dB when the US data rate is 5 Gb/s.
期刊：
EUROPEAN PHYSICAL JOURNAL E,2016年89(12):272-null ISSN：1292-8941
通讯作者：
Han, Jihui
作者机构：
[Zhao, Longfeng; Deng, Weibing; Li, Wei; Su, Zhu; Han, Jihui] Cent China Normal Univ, Complex Sci Ctr, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Han, Jihui] C;Cent China Normal Univ, Complex Sci Ctr, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
Statistical and Nonlinear Physics
摘要：
The label propagation algorithm (LPA) has been proved to be a fast and effective method for detecting communities in large complex networks. However, its performance is subject to the non-stable and trivial solutions of the problem. In this paper, we propose a modified label propagation algorithm LPAf to efficiently detect community structures in networks. Instead of the majority voting rule of the basic LPA, LPAf updates the label of a node by considering the compression of a description of random walks on a network. A multi-step greedy agglomerative strategy is employed to enable LPAf to escape the local optimum. Furthermore, an incomplete update condition is also adopted to speed up the convergence. Experimental results on both synthetic and real-world networks confirm the effectiveness of our algorithm.
作者机构：
[Zhang, Rui; Jiang, Jian] Wuhan Text Univ, Coll Math & Comp Sci, Wuhan 430200, Peoples R China.;[Guo, Long] China Univ Geosci, Sch Math & Phys, Wuhan 430074, Peoples R China.;[Li, Wei; Cai, Xu] Cent China Normal Univ, Inst Particle Phys, Complex Sci Ctr, Wuhan 430079, Peoples R China.
通讯机构：
[Jiang, Jian] W;Wuhan Text Univ, Coll Math & Comp Sci, Wuhan 430200, Peoples R China.
关键词：
多层航空运输网络;网络聚合过程
摘要：
The air transportation network, one of the common multilayer complex systems, is composed of a collection of individual airlines, and each airline corresponds to a different layer. An important question is then how many airlines are really necessary to represent the optimal structure of a multilayer air transportation system. Here we take the Chinese air transportation network (CATN) as an example to explore the nature of multiplex systems through the procedure of network aggregation. Specifically, we propose a series of structural measures to characterize the CATN from the multilayered to the aggregated network level. We show how these measures evolve during the network aggregation process in which layers are gradually merged together and find that there is an evident structural transition that happened in the aggregated network with nine randomly chosen airlines merged, where the network features and construction cost of this network are almost equivalent to those of the present CATN with twenty-two airlines under this condition. These findings could shed some light on network structure optimization and management of the Chinese air transportation system.
期刊：
International Journal of Modern Physics C,2016年27(10):1650122 ISSN：0129-1831
通讯作者：
Zhu, Yueying
作者机构：
[Wang, Qiuping A.; Zhu, Yueying] Univ Maine, IMMM, UMR CNRS 6283, F-72085 Le Mans, France.;[Zhao, Longfeng; Zhu, Yueying; Li, Wei; Cai, Xu] Cent China Normal Univ, Complex Sci Ctr, Wuhan 430079, Peoples R China.;[Zhao, Longfeng; Zhu, Yueying; Li, Wei; Cai, Xu] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Li, Wei] Max Planck Inst Math Sci, Inselst 22, D-04103 Leipzig, Germany.
通讯机构：
[Zhu, Yueying] U;[Zhu, Yueying] C;Univ Maine, IMMM, UMR CNRS 6283, F-72085 Le Mans, France.;Cent China Normal Univ, Complex Sci Ctr, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
关键词：
Random walks;metro network;Laplacian spectrum;shortest path length
摘要：
In this paper, we investigate the random walks on metro systems in 28 cities from worldwide via the Laplacian spectrum to realize the trapping process on real systems. The average trapping time is a primary description to response the trapping process. Firstly, we calculate the mean trapping time to each target station and to each entire system, respectively. Moreover, we also compare the average trapping time with the strength (the weighted degree) and average shortest path length for each station, separately. It is noted that the average trapping time has a close inverse relation with the station’s strength but rough positive correlation with the average shortest path length. And we also catch the information that the mean trapping time to each metro system approximately positively correlates with the system’s size. Finally, the trapping process on weighted and unweighted metro systems is compared to each other for better understanding the influence of weights on trapping process on metro networks. Numerical results show that the weights have no significant impact on the trapping performance on metro networks.
作者机构：
[Deng, Weibing; Li, Wei; Han, Jihui; Han, JH; Li, W] Cent China Normal Univ, Complex Sci Ctr, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Han, JH; Li, W; Deng, WB] C;Cent China Normal Univ, Complex Sci Ctr, Wuhan 430079, Peoples R China.
摘要：
Aiming at improving the efficiency and accuracy of community detection in complex networks, we proposed a new algorithm, which is based on the idea that communities could be detected from subnetworks by comparing the internal and external cohesion of each subnetwork. In our method, similar nodes are firstly gathered into meta-communities, which are then decided to be retained or merged through a multilevel label propagation process, until all of them meet our community criterion. Our algorithm requires neither any priori information of communities nor optimization of any objective function. Experimental results on both synthetic and real-world networks show that, our algorithm performs quite well and runs extremely fast, compared with several other popular algorithms. By tuning a resolution parameter, we can also observe communities at different scales, so this could reveal the hierarchical structure of the network. To further explore the effectiveness of our method, we applied it to the E-Coli transcriptional regulatory network, and found that all the identified modules have strong structural and functional coherence.
摘要：
The standard model of particle physics describes the fundamental particles and their interactions via the strong, electromagnetic and weak forces. It provides precise predictions for measurable quantities that can be tested experimentally. The probabilities, or branching fractions, of the strange B meson (B-s(0)) and the B-0 meson decaying into two oppositely charged muons (mu(+) and mu(-)) are especially interesting because of their sensitivity to theories that extend the standard model. The standard model predicts that the B-s(0)->mu(+)mu(-) and B-0 ->mu(+)mu(-) decays are very rare, with about four of the former occurring for every billion B-s(0) mesons produced, and one of the latter occurring for every ten billion B-0 mesons(1). A difference in the observed branching fractions with respect to the predictions of the standard model would provide a direction in which the standard model should be extended. Before the Large Hadron Collider (LHC) at CERN2 started operating, no evidence for either decay mode had been found. Upper limits on the branching fractions were an order of magnitude above the standard model predictions. The CMS (Compact Muon Solenoid) and LHCb(Large Hadron Collider beauty) collaborations have performed a joint analysis of the data from proton-proton collisions that they collected in 2011 at a centre-of-mass energy of seven teraelectronvolts and in 2012 at eight teraelectronvolts. Here we report the first observation of the B-s(0)->mu(+)mu(-) decay, with a statistical significance exceeding six standard deviations, and the best measurement so far of its branching fraction. Furthermore, we obtained evidence for the B-0 ->mu(+)mu(-) decay with a statistical significance of three standard deviations. Both measurements are statistically compatible with standard model predictions and allow stringent constraints to be placed on theories beyond the standard model. The LHC experiments will resume taking data in 2015, recording proton-proton collisions at a centre-of-mass energy of 13 teraelectronvolts, which will approximately double the production rates of B-s(0) and B-0 mesons and lead to further improvements in the precision of these crucial tests of the standard model.
作者：
Agakishiev, H.*;Aggarwal, M. M.;Ahammed, Z.;Alakhverdyants, A. V.;Alekseev, I.;...
期刊：
PHYSICAL REVIEW C,2014年89(4) ISSN：2469-9985
通讯作者：
Agakishiev, H.
作者机构：
[Kechechyan, A.; Kizka, V.; Agakishiev, H.; Averichev, G. S.; Bunzarov, I.; Efimov, L. G.; Panebratsev, Y.; Alakhverdyants, A. V.; Shahaliev, E.; Rogachevskiy, O. V.; Fedorisin, J.; Zoulkarneev, R.; Zoulkarneeva, Y.; Tokarev, M.; Filip, P.; Lednicky, R.; Dedovich, T. G.; Heppelmann, S.; Vokal, S.] Joint Inst Nucl Res, Dubna 141980, Russia.;[Underwood, D. G.; Krueger, K.; Bridgeman, A.; Spinka, H. M.] Argonne Natl Lab, Argonne, IL 60439 USA.;[Ullrich, T.; Pile, P.; Lamont, M. A. C.; LeVine, M. J.; Ljubicic, T.; Xu, Z.; Ogawa, A.; Ruan, L.; Tang, A. H.; Videbaek, F.; Fine, V.; Fisyak, Y.; Beavis, D. R.; Lauret, J.; Bland, L. C.; Longacre, R. S.; Webb, J. C.; Christie, W.; Arkhipkin, D.; Debbe, R. R.; Lebedev, A.; Burton, T. P.; Dunlop, J. C.; Gordon, A.; Landgraf, J. M.; Love, W. A.; Yip, K.; Didenko, L.; Guryn, W.; Van Buren, G.; Lee, J. H.] Brookhaven Natl Lab, Upton, NY 11973 USA.;[Perkins, C.; Crawford, H. J.; Engelage, J.; Alford, J.; Judd, E. G.] Univ Calif Berkeley, Berkeley, CA 94720 USA.;[Draper, J. E.; Cebra, D.; Brovko, S. G.; Beavis, D. R.; Sangaline, E.; Reed, R.; de la Barca Sanchez, M. Calderon; Romero, J. L.; Salur, S.; Haag, B.] Univ Calif Davis, Davis, CA 95616 USA.
通讯机构：
[Agakishiev, H.] J;Joint Inst Nucl Res, Dubna 141980, Russia.
摘要：
STAR measurements of dihadron azimuthal correlations (Lambda phi) are reported in midcentral (20-60%) Au + Au collisions at v root sNN = 200 GeV as a function of the trigger particle's azimuthal angle relative to the event plane, phi(s) = | phi(1) -psi(EP)|. The elliptic (v(2)), triangular (v(3)), and quadratic (v(4)) flow harmonic backgrounds are subtracted using the zero yield at mini + Au collisions. It is found that a finite near-side (| Delta phi | < pi/2) long-range pseudorapidity correlation (ridge) is present in the in-plane direction (phi(s) similar to 0). The away-side (| Delta phi | > pi/2) correlation shows a modification from d+ Au data, varying with fs. The modification may be a consequence of path-length-dependent jet quenching and may lead to a better understanding of high-density QCD.