An oscillator circuit and an oscillation stabilizing method are provided that can improve the productivity of products, stabilize an oscillating operation, and achieve more stable operations for a system supplied with oscillation output. More specifically, a device and method for detecting disordered breathing is provided that monitors a physiological parameter, which becomes cyclical due to apnea-hyperpnea alternation and provides the basis for the determination of a number of breathing disorder metrics. The introduction is interrupted when the ring occupies a determined position with respect to the case. The invention is particularly described in connection with plasma simulations used for the optimization dual-frequency capacitively-coupled plasma etching systems. A pseudo-random number of bits is added to an original pixel value of M bits, the result of the addition is then truncated at N bits, wherein the random values which are added to two or more adjacent pixels values are mutually correlated.