Periodic oscillation of FCNNs with distributed delays and variable coefficients

In this paper, a class of fuzzy cellular neural networks (FCNNs) with distributed delays and variable coefficients is discussed. By applying the matrix theory and the inequality analysis technique, some sufficient conditions on the existence, global exponential stability and weak global exponential stability of periodic solutions are established. Particularly, differently from some previous works, in this paper we do not require the activation functions in the system are bounded and fi(0)=0fi(0)=0.