ELFT HÍRADÓ

[Szommer Peter <szpl AT metal.elte.hu>]

ELTE Fizikai Intézet

                            ORTVAY KOLLOKVIUM
                                
                    2011. június 2., csütörtök, 15 órakor
                Az ELTE Pázmány Péter s. 1/A alatti épületében
                            földszinti 0.81 előadóban

            Barabási Albert-László (Northeastern University, Boston)
                    "Komplex hálózatok kontrollálhatósága"
		  

Kivonatos ismertetés:
The ultimate proof of our understanding of natural or technological systems is 
reflected in our ability to control them. While control theory offers mathematical
tools to steer engineered and natural systems towards a desired state, we lack
a framework to control complex self-organized systems. Here we develop 
analytical
tools to study the controllability of an arbitrary complex directed network, 
identifying the set of driver nodes whose time-dependent control can guide the 
system's entire dynamics. We apply these tools to several real networks, finding
that the number of driver nodes is determined mainly by the network's degree 
distribution. We show that sparse inhomogeneous networks, which emerge in many 
real complex systems, are the most difficult to control, but dense and homogeneous
networks can be controlled via a few driver nodes. Counterintuitively, we find
that in both model and real systems the driver nodes tend to avoid the hubs.