New Stability Criterion for Discrete-Time Genetic Regulatory Networks with Time-Varying Delays and Stochastic Disturbances

Zhao, Yanfeng; Shen, Jihong; Chen, Dongyan

doi:https://doi.org/10.1155/2016/7634680

Mathematical Problems in Engineering

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Abstract Introduction Preliminaries Conclusion Acknowledgments References Copyright Related Articles

Research Article | Open Access

Volume 2016 | Article ID 7634680 | https://doi.org/10.1155/2016/7634680

New Stability Criterion for Discrete-Time Genetic Regulatory Networks with Time-Varying Delays and Stochastic Disturbances

Yanfeng Zhao,^1,2Jihong Shen,³and Dongyan Chen⁴

Academic Editor: Jose J. Muñoz

Received09 Feb 2016

Revised05 May 2016

Accepted12 May 2016

Published15 Jun 2016

Abstract

We propose an improved stability condition for a class of discrete-time genetic regulatory networks (GRNs) with interval time-varying delays and stochastic disturbances. By choosing an augmented novel Lyapunov-Krasovskii functional which contains some triple summation terms, a less conservative sufficient condition is obtained in terms of linear matrix inequalities (LMIs) by using the combination of the lower bound lemma, the discrete-time Jensen inequality, and the free-weighting matrix method. It is shown that the proposed results can be readily solved by using the Matlab software. Finally, two numerical examples are provided to illustrate the effectiveness and advantages of the theoretical results.

1. Introduction

Genetic regulatory networks (GRNs), which are structured by the networks of the regulatory interactions among DNA, RNA, and proteins, have become an important research domain in the biological and biomedical sciences. Basically, there are two basic types of the genetic regulatory network models including the Boolean model [1] and the differential/difference equation model [2]. It should be noted that it is difficult to give an accurate mathematical model for the GRNs due to various reasons such as the limitations on the experimental data, the noise in the data extraction, and enormous complexity of the actual biological systems. So far, a lot of effective analysis methods have been developed in the relevant literatures, such as [3–5] and the references therein. Accordingly, the stability analysis issues for GRNs have drawn a great deal of attention and many important results have been given in this area based on the Lyapunov stability theory; see, for example, [6, 7].

It is revealed that the time delay is inevitable in the GRNs due to the slow biochemical reactions including the actual regulation, transcription, translation, diffusion, and translocation, especially in that of a eukaryotic cell [8]. The existence of the time delays would degrade the performance of the dynamical systems and even lead to the instability [9–16]. Hence, it is not surprising that there are a great number of results concerning the stability analysis for GRNs with time delays. For example, a functional differential equation model has been introduced in [9] for GRNs with time delays and its local stability and bifurcation have been discussed. In [11], the discrete-time analog of the continuous-time GRNs has been formulated and a stability analysis condition has been given for the discrete-time GRNs with time delays. It is worth noting that the above delayed GRNs are all concerning the deterministic delays. However, in many practical systems (e.g., networked control systems), the network-induced delay often appears as the time-varying feature. In [17], the robust stability problem has been addressed for GRNs with time-varying delays. Subsequently, the improved stability criteria have been established for GRNs with interval time-varying delays [18] and infinite-distributed delays [19]. In [8], the authors have studied a class of GRNs with same transcriptional delays and translation delays which take values in a finite set governed by a Markov chain with known transition probabilities.

Note that the models in [6, 9] are all described by the differential equations. However, during implementing a continuous-time genetic regulatory network (GRN) for computer simulation and experimental or computational purposes, it is common to discretize the continuous-time GRN to a discrete-time analogue. Therefore, there is a need to study the dynamics behaviors of the discrete-time GRNs. Up to now, there is a little work on the discrete-time GRNs with delays [20–23]. Recently, the asymptotic stability problem has been investigated in [24] for a class of discrete-time uncertain stochastic GRNs with time-varying delays, where a set of sufficient conditions to ensure the stability has been derived in terms of LMIs, while the exponential stability analysis and the robust control problems for discrete-time GRNs have been investigated in [25, 26]. On the other hand, it is well recognized that the noise, which involves the intrinsic fluctuation and extrinsic noise, may impose great effect on system performance of the complex systems [27–31]. For example, the global robust power-rate stability problem has been studied in [28] for uncertain GRNs with unbounded time-varying delay and noise perturbations based on the Lyapunov method, Itô’s differential formula, and LMI technique. In [30], the authors have investigated the stability problem for GRNs with time-varying delays and stochastic fluctuations, where some sufficient conditions have been given to guarantee the asymptotic stability and exponential stability of the addressed GRNs. So far, it is worth mentioning that there is a great need to analyze the stability problem of delayed GRNs with stochastic disturbances by proposing new analysis method with less conservatism, which has wide applications in the biological/biomedical sciences; see, for example, [32, 33].

In this paper, we aim to obtain an improved stability criterion for discrete-time GRNs with interval time-varying delays and stochastic disturbances based on the existing methods. A new augmented Lyapunov-Krasovskii functional is firstly constructed which contains some triple summation terms. Furthermore, both the discrete-time Jensen inequality and the lower bound lemma are adopted to handle the summation terms. As in [34], it is easy to see that the lower bound theorem can achieve better results than those based on the Jensen inequality for the stability analysis of the delayed systems. Therefore, we revisit the stability analysis problem for GRNs with time-varying delays and the stochastic disturbances by fully taking the lower bound lemma, the discrete-time Jensen inequality, and the free-weighting matrix method into account and propose an improved stability criterion with less conservatism compared with the results in [20, 21]. The main contributions of this paper are highlighted as follows: (1) both the discrete-time Jensen inequality and the well-known reciprocally convex combination approach are adopted to handle the triple summation terms; hence more information of the time delays is reflected in the main results; and (2) a new sufficient condition with less conservatism is given for the considered discrete delayed GRNs in terms of the LMI method. Finally, two numerical examples are included to show the effectiveness of the proposed method.

Notations. For any matrix , means that is symmetric positive definite. stands for the mathematical expectation operator. The superscript represents the transpose of the matrix. represents the identity matrix with appropriate dimensions. ) is a probability space, is the sample space, is the -algebra of subsets of the sample space, and is the probability measure on . For simplicity, in symmetric block matrices, we often use to represent the term that is induced by symmetry.

2. Model Description and Preliminaries

Consider the following discrete-time GRNs with time-varying delays, mRNAs, and proteins which are described by the difference equations:where and are the concentrations of mRNA and protein of the th node, respectively. is a positive real number denoting a uniform discretionary step size, and and are the degradation rates of mRNA and protein, respectively. is the translation rate, and and are the time-varying delays denoting the feedback regulation delay and the translation delay satisfying and . Let , where is a bounded constant and denotes the dimensionless transcriptional rate of transcription factor to , and is the set of all which is a repressor of gene . Moreover, and . Obviously, we can see that and hold. The coupling coefficients are defined as follows: In addition, the nonlinear function represents the feedback regulation of the protein on the transcription. It is a monotonic function in the Hill form; that is, , where is the Hill coefficient and is a positive constant.

Next, rewrite system (1) as the following compact form: where

Let be an equilibrium point of system (3). Then, it follows thatSubsequently, we shift the equilibrium point of system (3) to the origin point through the transformations , . Then, system (3) can be transformed into the following form: where

When the stochastic perturbations are taken into account, system (6) becomeswhere is a one-dimensional Gaussian white noise sequence on a probability space () with The noise intensity matrix satisfies where , , , and are known constant matrices with appropriate dimensions.

Assumption 1. For and any with , is a monotonically increasing function and satisfies thatwhere are known constants.

Remark 2. Assumption 1 has been commonly used in the literature, for example, [11]. In fact, it is easy to check that the left-hand side of (10) holds as long as is a monotonically increasing function.

To end this section, we introduce the following lemmas which will be frequently used in the derivation of the main results.

Lemma 3 (see [26] (discrete-time Jensen inequality)). For any , two scalars and with , and any vector-valued function , it follows that

Lemma 4 (see [34] (lower bounds theorem)). Let have positive values in an open subset of . Then, the reciprocally convex combination of over satisfies with

3. Main Results

In this section, a new Lyapunov-Krasovskii functional is firstly constructed by taking some triple summation terms into account. Subsequently, we give a new stability condition for the addressed GRNs with time-varying delays and stochastic disturbances by using the combination of the lower bound lemma, the discrete-time Jensen inequality, and the free-weighting matrices method. It is worthwhile to mention that the presented sufficient condition can be easily checked by using the Matlab LMI toolbox.

Theorem 5. For given positive scalars , , , and , if there exist scalar , matrices , , , , , , positive diagonal matrices , , and matrices , such that the following LMIs hold:where and the remaining terms are zero; then the considered system (7) is mean square asymptotically stable.

Proof. SetMotivated by [26, 35], we construct the following Lyapunov-Krasovskii functional for the discrete-time stochastic GRN (7): whereCalculate the difference of by defining along the solutions of (7) and taking mathematical expectation. It follows from Lemma 3 thatFor any positive-definite matrices and any matrices with , it follows from Lemmas 3 and 4 thatSimilarly, we havewhere and are defined in Theorem 5.
By applying Lemma 3, for , the following inequalities can be established: where , , , and are defined in Theorem 5. From Assumption 1, for diagonal matrices , and a known matrix , it is not difficult to see that the following inequalities hold.
In addition, we get Then, for any matrices and , we have where Now, combining (19), (20), (21), (22), (23), and (25), we obtain the following inequality: with According to LMIs (14), one has . Hence, we have . Thus, the considered stochastic GRN is asymptotically stable in mean square sense, which ends the proof of this theorem.

Remark 6. Note that a novel Lyapunov-Krasovskii functional has been proposed in [26] including some triple summation terms, where some new yet effective robust stabilization and control schemes have been given for discrete uncertain GRNs with time-varying delays and disturbances. In order to further reduce the conservatism induced by the time delays, it is worth mentioning that a new Lyapunov-Krasovskii functional has been constructed as in Theorem 5 motivated by the efficient results in [26, 35]. Moreover, the discrete-time Jensen inequality lemma has been used in Theorem 5 to deal with the summation terms (20) and (21) as in [26], where more information of the time-varying delays has been utilized in our main results. In addition, as pointed out in [34], by using the lower bounds theorem and the discrete-time Jensen inequality, less conservative stability criteria can be obtained compared to the one where the discrete-time Jensen inequality is used only. Hence, based on the combination of the discrete-time Jensen inequality, the lower bounds theorem, and the free-weighting matrix approach, some useful information of the time delays is considered and then a new stability condition is proposed for the addressed delayed GRNs and the conservatism from the time-varying delays is further reduced.

Remark 7. The standard LMI system has a polynomial-time complexity, which is bounded by , where is the total row size of the LMI system and is the total number of scalar decision variables. For example, let us consider the proposed stability criterion for the addressed GRNs (as described in Theorem 5); we have and . Therefore, the computational complexity of the LMI-based stability criterion can be represented as .

4. Numerical Simulations

In this section, we provide two numerical examples to illustrate the effectiveness and correctness of the main results.

Example 1. Consider the five-node GRN (7) with its parameters borrowed from [21]:Letting the nonlinear regulatory function be , then it is easy to see Moreover, assume , , , . By using the LMIs control toolbox in Matlab to solve the LMIs in Theorem 5, we can see that they are feasible with parts of the obtained parameters as follows:Therefore, according to Theorem 5, GRN (7) with time-varying delays and stochastic disturbances is mean square asymptotically stable. Based on the parameter mentioned above, the trajectories of the mRNA and protein concentrations are plotted in Figures 1 and 2, respectively.

Example 2. Consider the five-node GRN (7) with the other case:the delay is unknown, and the other parameters are listed as in Example 1. According to the different lower bounds of time delays, the delays upper bounds for guaranteeing the asymptotical stability of the addressed GRN are obtained as in Table 1 by using Theorem 5, Theorem 3 in [20], and Theorem 1 in [21], respectively. It should be pointed out that Theorem 1 in [20] is infeasible when setting , the feedback regulation delay , and the translation delay satisfying and , respectively; however, it is easy to see that system (7) is asymptotically stable by using Theorem 5 proposed in this paper. Therefore, the newly proposed result has less conservatism than the results in [20, 21].

5. Conclusion

In the paper, we have investigated the stability analysis problem for discrete-time GRNs with interval time-varying delays and stochastic disturbances. By utilizing a new augmented Lyapunov-Krasovskii functional which contains some triple summation terms, the discrete-time Jensen inequality, and the lower bound lemma, an improved delay-dependent stability criterion has been given in terms of LMIs to guarantee the mean square asymptotic stability for the addressed discrete-time GRNs. The effectiveness and advantage of the proposed method have been illustrated by utilizing two numerical examples. Based on the proposed results, we can extend the idea of this paper to other system models with Markovian jumping parameters [35, 36], time-varying parameters [37, 38], stochastic uncertainties [39, 40], and stochastic nonlinearities [41–43]. Moreover, the problems of the robust state estimation and filtering for discrete GRNs with different scourers noises as in [44–46] will be discussed in our future research.

Competing Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.

Acknowledgments

This work was supported in part by the National Natural Science Foundation of China under Grants 11401141 and 11271103, Heilongjiang Provincial Natural Science Foundation for Youths under Grant QC2013C001, Heilongjiang Provincial Postdoctoral Science Foundation under Grant LBH-Z15098, and Natural Science Foundation of Heilongjiang Educational Committee under Grant 12531099.

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Copyright © 2016 Yanfeng Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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