Parameters identification of unknown delayed genetic regulatory networks by a switching particle swarm optimization algorithm

Authors:
Yang Tang;Zidong Wang;Jian-an Fang
Affiliations:
College of Information Science and Technology, Donghua University, Shanghai 201620, PR China;College of Information Science and Technology, Donghua University, Shanghai 201620, PR China and Department of Information Systems and Computing, Brunel University, Uxbridge, Middlesex, UB8 3PH, U ...;College of Information Science and Technology, Donghua University, Shanghai 201620, PR China
Venue:
Expert Systems with Applications: An International Journal
Year:
2011

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Abstract

This paper presents a novel particle swarm optimization (PSO) algorithm based on Markov chains and competitive penalized method. Such an algorithm is developed to solve global optimization problems with applications in identifying unknown parameters of a class of genetic regulatory networks (GRNs). By using an evolutionary factor, a new switching PSO (SPSO) algorithm is first proposed and analyzed, where the velocity updating equation jumps from one mode to another according to a Markov chain, and acceleration coefficients are dependent on mode switching. Furthermore, a leader competitive penalized multi-learning approach (LCPMLA) is introduced to improve the global search ability and refine the convergent solutions. The LCPMLA can automatically choose search strategy using a learning and penalizing mechanism. The presented SPSO algorithm is compared with some well-known PSO algorithms in the experiments. It is shown that the SPSO algorithm has faster local convergence speed, higher accuracy and algorithm reliability, resulting in better balance between the global and local searching of the algorithm, and thus generating good performance. Finally, we utilize the presented SPSO algorithm to identify not only the unknown parameters but also the coupling topology and time-delay of a class of GRNs.