ORIGINAL ARTICLE
Global exponential stability of a class of memristive neural
networks with time-varying delays
Xin Wang
•
Chuandong Li
•
Tingwen Huang
•
Shukai Duan
Received: 11 November 2012 / Accepted: 28 February 2013 / Published online: 16 April 2013
Ó Springer-Verlag London 2013
Abstract This paper studies the uniqueness and global
exponential stability of the equilibrium point for memris-
tor-based recurrent neural networks with time-varying
delays. By employing Lyapunov functional and theory of
differential equations with discontinuous right-hand side,
we establish several sufficient conditions for exponential
stability of the equilibrium point. In comparison with the
existing results, the proposed stability conditions are milder
and more general, and can be applied to the memristor-
based neural networks model whose connection weight
changes continuously. Numerical examples are also pre-
sented to show the effectiveness of the theoretical results.
Keywords Memristive neural network Exponential
stability Time delay Lyapunov functional
1 Introduction
In 1971, Chua [1] predicted that, besides the resistor,
capacitor and inductor, there should be the fourth circuit
element which is now called the memristor (contraction of
memory resistor). However, the great finding has not caused
the attention of the scientists until a group of scientists from
Hewlett-Packard Laboratory announced that they had build
a prototype of the memristor in 2008 [2]. This new circuit
element shares many properties of resistors and shares the
same unit of measurement (i.e., ohm). Recently, the
researchers showcased a number of promising applications
of memristive devices [3–7]. Memristor behavior is more
and more noticeable as new technology process nodes are
introduced in integrated circuit design, where the memristor
may be used as a nonvolatile memory switch. Because of
this feature, the new models of networks based on memr-
istor have been designed and analyzed [8–11, 24–26].
As we know, neural networks have found many important
applications in the fields of associative memory, pattern rec-
ognition, signal processing, systems control and optimization
problem [12–22]. During the past few years, the problem of
memristor-based neural networks has been one of the most
active research areas and has attracted the attention of many
researchers. However, the existing memristor-based networks
have been found to be computationally restrictive. The
applicability of these memristor-based networks is strongly
restricted. So some researchers turn their attentions to the
general memristor-based neural network which was firstly
introduced in [8]. Furthermore, an interesting issue is to
investigate the dynamic behavior of memristor-based recur-
rent neural networks, an ideal model for the case where the
memristor-based circuit networks exhibit complex switching
phenomena. Hu and Wang [8] considered the global asymp-
totic stability of memristor-based recurrent neural networks.
Guo et al. [10] presented some sufficient conditions for
exponential stability for memristor-based recurrent neural
networks. However, these criteria only suits for the binary
memristor-based connection weight. The wilder exponential
stability criteria for multiple-valued cases are expected.
Motivated by the aforementioned discussion, in this paper,
we address the issue of global exponential stability for the
X. Wang C. Li (&)
College of Computer Science, Chongqing University,
Chongqing 400044, China
e-mail: licd@cqu.edu.cn
T. Huang
Texas A&M University at Qatar,
Doha 23874, Qatar
S. Duan
School of Electronic and Information Engineering,
Southwest University, Chongqing 400715, China
123
Neural Comput & Applic (2014) 24:1707–1715
DOI 10.1007/s00521-013-1383-1