The breaking of an approximate discrete symmetry, the final stages of a first order phase transition, or a postinflationary biased probability distribution for scalar fields are possible cosmological scenarios characterized by the presence of unstable domain wall networks. Combining analytical and numerical techniques, we show that the non-spherical collapse of these domains can be a powerful s...

Chaotic attractors of discrete-time neural networks include infinitely many unstable periodic orbits, which can be stabilized by small parameter changes in a feedback control. Here we explore the control of unstable periodic orbits in a chaotic neural network with only two neurons. Analytically, a local control algorithm is derived on the basis of least squares minimization of the future deviat...

Advances in wireless technologies, including more powerful devices and low cost radio technologies, have potential to drive an ubiquitous utilization of Internet services. Nevertheless wireless technologies face performance limitations due to unstable wireless conditions and mobility of devices. In face of multi-path propagation and low data rate stations, cooperative relaying promises gains in...

Generally, the radio channel quality of a wireless sensor network (WSN) is unstable in harsh environment. For instance, in maritime search and rescue, the nodes of WSN move dynamically, the topology changes with respect to the time and the communication link changes frequently as well. What is more, the given communication distance of nodes can limit the efficiency of routing. In view of these ...