Controlling cluster synchronization by adapting the topology

We suggest an adaptive control scheme for the control of zero-lag and cluster synchronization in delay-coupled networks. Based on the speed-gradient method, our scheme adapts the topology of a network such that the target state is realized. It is robust towards different initial condition as well as changes in the coupling parameters. The emerging topology is characterized by a delicate interplay of excitatory and inhibitory links leading to the stabilization of the desired cluster state. As a crucial parameter determining this interplay we identify the delay time. Furthermore, we show how to construct networks such that they exhibit not only a given cluster state but also with a given oscillation frequency. We apply our method to coupled Stuart-Landau oscillators, a paradigmatic normal form that naturally arises in an expansion of systems close to a Hopf bifurcation. The successful and robust control of this generic model opens up possible applications in a wide range of systems in physics, chemistry, technology, and life science

Forum on Identity

The forum contributors draw on their personal experiences and insights to put forth ideas about contingent faculty\u27s relations with other faculty and with the academic institution as a whole

Canadian social enterprises: An empirical exploration of social transformation, financial self-sufficiency, and innovation

This article reports on empirical research investigating social transformation, financial self-sufficiency, and innovation in Canadian social enterprises. A set of profiles on 60 randomly selected social enterprises utilizing information from each organization's Web site was developed and analyzed. The profiles show that about one-third of the sample enterprises were deemed high in social transformation, approximately one-half were assessed high in financial self-sufficiency, and fewer that one-fifth were found to be highly innovative. Implications for marketing in social enterprises are drawn