The Complex Systems and Networks Lab (COSNET) is part of the Institute for Biocomputation and Physics of Complex Systems (BIFI) of the University of Zaragoza, and is mainly devoted to investigate the laws governing the structure and dynamics of complex networked systems.

The group was constituted and introduced as one of BIFI’s research lines in 2003 by Dr. Yamir Moreno after returning from a postdoctoral stay at the Abdus Salam International Centre for Theoretical Physics (ICTP) in Trieste, Italy. The main goal was to promote the scientific research in a promising subject with multiple applications to various scientific fields such as: synchronization phenomena, epidemic spreading, analysis of biological, economic and social systems, communication networks, etc. The group gradually took shape during the first years with the support and collaboration of other members of the Department of Condensed Matter and Theoretical Physics and grew up later to reach its actual status. Nowadays, the group has consolidated at BIFI and at the University of Zaragoza and has also the recognition of many researchers within and outside our borders. Currently, the line is one of the most prolific of our Institute according to the number of high-impact scientific publications in international journals and the projection of our group in the field of Complex Systems and Networks.

During all these years, our research has been aimed at uncovering the mechanisms behind diverse complex phenomena in various scientific fields. The work carried out includes several studies about synchronization processes, disease contagion, and the analysis of biological, economic and socio-technological systems. Lately, we have also focused our interest in Systems Biology of TB and the network approach to brain and cognitive sciences.

  • Multi-Scale Diseases

    Multi-Scale Diseases

    Current modeling of infectious diseases allows for the study of complex and realistic scenarios that go from the population to the individual level of description. The advances in the realism of epidemic modeling are however hampered by our current limitations to properly deal with several factors such as: real demographic distributions, detailed migration and mobility patterns, human behavioral responses to the presence of an outbreak, disease’s multi-strain, and the concurrency of ...

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  • Online Social Networks and the Diffusion of Protest

    Online Social Networks and the Diffusion of Protest

    The recent wave of mobilizations in the Arab world and across Western countries has generated much discussion on how digital media is connected to the diffusion of protests. We examine that connection using data from the surge of mobilizations that took place in Spain in May 2011. We study recruitment patterns in the Twitter network and find evidence of social influence and complex contagion. We identify the network position of ...

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  • Heterogeneous Networks do no promote cooperation among humans playing a PD game

    Heterogeneous Networks do no promote cooperation among humans playing a PD game

    It is not fully understood yet why we cooperate with strangers on a daily basis. In an increasingly global world, where interaction networks and relationships between individuals are becoming more complex, different hypotheses have been put forward to explain the foundations of human cooperation on a large scale and to account for the true motivations that are behind this phenomenon. In this context, population structure has been suggested to foster cooperation in social dilemmas, but theoretical studies ...

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  • Multilevel Boolean Networks

    Multilevel Boolean Networks

    The study of the interplay between the structure and dynamics of complex multilevel systems is a pressing challenge nowadays. In this paper, we use a semi-annealed approximation to study the stability properties of Random Boolean Networks in multiplex (multi-layered) graphs. Our main finding is that the multilevel structure provides a mechanism for the stabilization of the dynamics of the whole system even when individual layers work on the chaotic regime, ...

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  • PRL on Diffusion Dynamics on Multiplex Networks

    PRL on Diffusion Dynamics on Multiplex Networks

    We study the time scales associated to diffusion processes that take place on multiplex networks, i.e., on a set of networks linked through interconnected layers. To this end, we propose the construction of a supra-Laplacian matrix, which consists of a dimensional lifting of the Laplacian matrix of each layer of the multiplex network. We use perturbative analysis to reveal analytically the structure of eigenvectors and eigenvalues of the complete network ...

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LATEST NEWS (older news can be seen here)
  • April 2014. Cosnet Lab together with our collaborators from UC3M launched the dedicated web page Nectunt, in which we will report all our work on evolutionary game theory and in particular, our experiments with humans playing social dilemmas.
  • March 2014. Dr. Carlos Gracia-lazaro, now in Cosnet, received the distinction “Extraordinary Doctorate Award” by the University of Zaragoza.
  • March 2014. Dr Yamir Moreno, gave a seminar at the School of Mathematics, University of Southampton, U.K. on the topic of Contagion Dynamics.
  • February, 2014. Dr. Carlos Gracia-Lazaro joins the group as a Post-doctoral fellow.
  • February, 2014. Dr Yamir Moreno, elected Vice-president secretary of the Complex Systems Society.
  • December 2013. Both FP7 Projects in which Cosnet is involved were evaluated with the highest mark (excellent progress) at the annual review meetings.
  • October, 2013. Dr. Yamir Moreno becomes member of the FET Advisory Group of the EC for the H2020 Framework.
  • September, 2013. New postdoctoral opening in our Group. More details here!
  • June 27-28, 2013. Dr. Yamir Moreno received the ISI Fellows award from the ISI Foundation, Turin, Italy. The ceremony took place on June 27th followed by the conference “The Being of Science” in which all ISI Fellows shared their vision with the public.
  • June 27-28, 2013. Dr. Sandro Meloni delivered an invited talk at the Workshop “Complexity in Social Systems: from data to models“, University of Cergy-Pontoise, Paris.
  • June 17-22, 2013. Dr. Yamir Moreno taught the course “Networks: Structure and Diffusion Dynamics at the Summer School “Emergent Dynamics of Discrete & Stochastic Multiscale Systems: analysis & simulation“, TU Eindhoven, The Netherlands.
  • June 11-13, 2013. Dr. Yamir Moreno delivered an invited talk at the Workshop “Uncertainty in Interactions Networks” at Bath University, UK.
  • June 6, 2013. Dr. Yamir Moreno joins the Board of the NetSci Society.
  • The next European Edition of NetSci, in 2015, will be held in Zaragoza organized by our group.
  • March 4, 2013. Dr. Yamir Moreno joins the Advisory Board of the WHO Collaborative Center “Complexity Sciences for Health Systems” (CS4HS), which is based on the Division of Mathematical Modeling at the University of British Columbia Centre for Disease Control, in Vancouver, British Columbia, Canada.
  • February 2013. COSNET members Dr. Sandro Meloni and Dr. Yamir Moreno will co-organize a Satellite Meeting at the European Conference on Complex Systems 2013 (ECCS2013), to be held in Barcelona from September 16 to September 20, 2013.
  • January 2013. New paper in  Physical Review Letters ["Diffusion dynamics on multiplex networks", PRL 110, 028701 (2013)] by COSNET members. Check it out in Publications.
  • November 27, 2012. Dr. Carlos Gracia-Lázaro successfully defended his Ph.D Thesis entitled “Dynamics and Collective Phenomena of Social Systems” under the supervision of Prof. Luis M. Floría and Dr. Yamir Moreno. He will continue his work as a postdoc within COSNET.
  • November 19 and 20, 2012. The kick-off meeting of MULTIPLEX took place at IMT in Lucca, Italy. Joaquín Sanz, Dr. Sandro Meloni and  PI Dr. Yamir Moreno attended the meeting.
  • November 16, 2012. has been launched. This is a platform to monitor the evolution of influenza and is part of the European Consortium Influenzanet. Help us to spread the word!.
  • November 6 and 7, 2012. The kick-off meeting of PLEXMATH took place in Tarragona. Emanuele Cozzo, Dr. Javier Borge, Dr. Jesus Gómez and  PI Dr. Yamir Moreno attended the meeting.
  • October 2012. Dr. Yamir Moreno, elected member of the Executive Committee of the Complex Systems Society.