A single dielectric barrier aerodynamic plasma actuator apparatus based on the dielectric barrier discharge phenomenon is disclosed and suggested for application to aerodynamic uses for drag reduction, stall elimination and airfoil efficiency improvement. The output voltage of a voltage source is measured. The disclosed system is an alternative method for inputting text into devices; the method is faster compared to existing predictive-text-input andor word-completion methods. The method includes receiving redirected network requests over a communications network from a firewall module, presenting a user license agreement and not requiring user-identifiable information, and synchronizing over the communications network with a client module and transmitting content to the client module. In one embodiment, at least one of the modules stores multiple masks. Each of the second to M-th block images is comprised of continuous \u201cn\u201d lines of the original image, and overlapped portions for \u201cd\u201d lines are present between the first to -th block images and the second to M-th block images, respectively.