“…By employing Lyapunov-Razumikhin functions together with differential inequalities, some sufficient conditions of robust exponential stability were obtained. In [120], proportional delay is considered in neural networks, to put it simply, x(t − τ(t)) is replaced by x(qt), where q ∈ (0, 1) is proportional delay factor and qt = t − (1 − q)t, in which (1 − q)t corresponds to the time delay required in processing and transmitting a signal from the jth cell to the ith cell. By using the improved Lyapunov-Razumikhin method, some sufficient conditions ensuring the existence, uniqueness and globally asymptotic stability of the concerned neural networks are presented.…”