Carusela M F, Perazzo R P, Romanelli L
Instituto de Ciencias, Universidad de General Sarmiento, Roca 850, 1663 San Miguel, Argentina.
Phys Rev E Stat Nonlin Soft Matter Phys. 2001 Sep;64(3 Pt 1):031101. doi: 10.1103/PhysRevE.64.031101. Epub 2001 Aug 6.
We show that an extended system operating in the regime of stochastic resonance can act as a short-term memory device. The system under study is a ring of overdamped bistable oscillators coupled directionally, being each also subject to an external source of Gaussian white noise (the noise sources are independent). A single oscillator is driven by an external periodic force, assumed to act only over the time that the signal takes to traverse the whole ring. A traveling wave is then found to be transmitted several times along the ring with a small damping, provided that the driven oscillator operates in a regime close to stochastic resonance. If noise is suppressed from any oscillator of the chain, the traveling wave is immediately damped. The ring is thus found to act as a short-term memory device in which the stored information (one bit, corresponding to the presence or absence of the external driving) is sustained by noise during a characteristic time T(mem).
我们表明，在随机共振状态下运行的扩展系统可充当短期记忆装置。所研究的系统是一个由过阻尼双稳振荡器定向耦合而成的环，每个振荡器还受到高斯白噪声外部源的影响（噪声源相互独立）。单个振荡器由外部周期性力驱动，假定该力仅在信号遍历整个环所需的时间内起作用。然后发现，只要被驱动的振荡器在接近随机共振的状态下运行，行波就能以小阻尼沿环多次传输。如果链中的任何一个振荡器的噪声被抑制，行波会立即衰减。因此发现该环可充当短期记忆装置，其中存储的信息（一位，对应于外部驱动的存在或不存在）在特征时间T(mem)内由噪声维持。
