title: Impulse-induced optimum signal amplification in scale-free networks.
abstract: Optimizing information transmission across a network is an essential task for controlling and manipulating generic information-processing systems. Here, we show how topological amplification effects in scale-free networks of signaling devices are optimally enhanced when the impulse transmitted by periodic external signals (time integral over two consecutive zeros) is maximum. This is demonstrated theoretically by means of a star-like network of overdamped bistable systems subjected to generic zero-mean periodic signals and confirmed numerically by simulations of scale-free networks of such systems. Our results show that the enhancer effect of increasing values of the signal's impulse is due to a correlative increase of the energy transmitted by the periodic signals, while it is found to be resonant-like with respect to the topology-induced amplification mechanism.
authors.affiliation: Departamento de Física Aplicada, EINA, Universidad de Zaragoza, E-50018 Zaragoza, Spain.|Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain.
authors.forename: Pedro J
authors.initials: PJ
authors.lastname: Martínez
authors.affiliation: Departamento de Física Aplicada, EII, Universidad de Extremadura, Apartado Postal 382, E-06006 Badajoz, Spain.|Instituto de Computación Científica Avanzada (ICCAEx), Universidad de Extremadura, E-06006 Badajoz, Spain.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Chacón