“…However, dynamically, they do not show sensitive dependence on initial conditions as seen from their negative Lyapunov exponents, that is, they are nonchaotic. In the past two decades, SNAs have been identified through numerical investigation in a number of dynamical systems, such as damped pendulum [Romeiras & Ott, 1987], biological oscillators [Ding & Scott Kelso, 1994], driven Duffing-type oscillators [Heagy & Ditto, 1991;Staglino et al, 1996;Yalcinkaya & Lai, 1996;Kapitanik & Wojewoda, 1993;Venkatesan et al, 2000] and in certain maps, namely driven velocity-dependent system [Venkatesan & Lakshmanan, 1998a, 1998b, circle map [Ding et al, 1989], two-dimensional map [Pikovsky et al, 1995], quasiperiodically forced logistic map [Prasad et al, 1997[Prasad et al, , 1998Anishchenko et al, 1996;Sosnovtseva et al, 1996;Kuznetsov et al, 1998;Nishikawa & Kaneko, 1996;Kaneko, 1984], one-dimensional cubic maps [Venkatesan & Lakshmanan, 1998a, 1998b, 2001Yalcinkaya & Lai, 1997;Heagy & Hammel, 1994], Harper map [Prasad et al, 1999], map representing driven damped superconducting quantum interference devices [Zhou & Chen, 1997;Ramaswamy, 1997;Chacon & Gracia-Hoz, 2002] and Heagy-Hammel (HH) neural oscillator [Kim & Lim, 2004]. When these strange nonchaotic attractors are reported in quantum systems [Bondeson et al, 1985], it further increased the interest among the researchers to probe in various fields.…”