A switched-current oscillator having a dc current source adapted to charge a capacitor so that the capacitor charging time is controlled based on a sequence of randomly selected values, each of those values defining a corresponding charging time. For each of the hyper-arcs, the variables are assembled in a hierarchy based on the relation corresponding to the hyper-arc. Correction amount is determined based on a result of assigning a respective weight to the rotation radius at each of the plurality of the frequencies based on information regarding at least one of an angular velocity and acceleration. The reset of the first function may initialize the first function to a known state before the second function may generate an output that may be received by the first function. The surfactant is represented by the following general formula :wherein R1 is an alkyl or alkenyl group having 10 to 18 carbon atoms.