In this paper, we introduce an advanced architecture of K-means clustering-based polynomial Radial Basis Function Neural Networks (p-RBF NNs) designed with the aid of Particle Swarm Optimization (PSO) and differential...
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In this paper, we introduce an advanced architecture of K-means clustering-based polynomial Radial Basis Function Neural Networks (p-RBF NNs) designed with the aid of Particle Swarm Optimization (PSO) and differentialevolution (DE) and develop a comprehensive design methodology supporting their construction. The architecture of the p-RBF NNs comes as a result of a synergistic usage of the evolutionary optimization-driven hybrid tools. The connections (weights) of the proposed p-RBF NNs being of a certain functional character and are realized by considering four types of polynomials. In order to design the optimized p-RBF NNs, a prototype (center value) of each receptive field is determined by running the K-means clustering algorithm and then a prototype and a spread of the corresponding receptive field are further optimized through running Particle Swarm Optimization (PSO) and differentialevolution (DE). The Weighted Least Square Estimation (WLSE) is used to estimate the coefficients of the polynomials (which serve as functional connections of the network). The performance of the proposed model and the comparative analysis involving models designed with the aid of PSO and DE are presented in case of a nonlinear function and two Machine Learning (ML) datasets (C) 2011 Elsevier B.V. All rights reserved.
This paper addresses the No-Wait Two-Stage Assembly Flow-shop Scheduling Problem (NWTSAFSP) with the objective of makespan minimization. The problem is a generalization of previously proposed general problem in the Tw...
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This paper addresses the No-Wait Two-Stage Assembly Flow-shop Scheduling Problem (NWTSAFSP) with the objective of makespan minimization. The problem is a generalization of previously proposed general problem in the Two-Stage Assembly Flow Shop Scheduling Problem (TSAFSP). The TSAFSP is NP-hard, thus the NWTSAFSP is NP-hard too, and three meta-heuristic algorithms, namely, Genetic algorithm (GA), differential evolution algorithm (DEA) and Population-based Variable Neighborhood Search (PVNS) are proposed in this article to solve this problem. Computational results reveal that PVNS outperforms other algorithms in terms of average error and average Coefficient of Variation (CV). Nevertheless, GA has the least run time among the proposed algorithms. (C) 2013 Sharif University of Technology. All rights reserved.
In the paper an application of differential evolution algorithm to training of artificial neural networks is presented. The adaptive selection of control parameters has been introduced in the algorithm;due to this pro...
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In the paper an application of differential evolution algorithm to training of artificial neural networks is presented. The adaptive selection of control parameters has been introduced in the algorithm;due to this property only one parameter is set at the start of proposed algorithm. The artificial neural networks to classification of parity-p problem have been trained using proposed algorithm. Results obtained using proposed algorithm have been compared to the results obtained using other evolutionary method, and gradient training methods such as: error back-propagation, and Levenberg-Marquardt method. It has been shown in this paper that application of differential evolution algorithm to artificial neural networks training can be an alternative to other training methods.
To determine structure and parameters of a rheological constitutive model for rocks,a new method based on differentialevolution(DE)algorithm combined with FLAC(a numerical code for geotechnical engineering)was propos...
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To determine structure and parameters of a rheological constitutive model for rocks,a new method based on differentialevolution(DE)algorithm combined with FLAC(a numerical code for geotechnical engineering)was proposed for identification of the global optimum coupled of model structure and its *** first,stochastic coupled mode was initialized,the difference in displacement between the numerical value and in-situ measurements was regarded as fitness value to evaluate quality of the coupled *** the coupled-mode was updated continually using DE rule until the optimal parameters were ***,coupled-mode was identified adaptively during back analysis *** results of applications to Jinping tunnels in China show that the method is feasible and efficient for identifying the coupled-mode of constitutive structure and its *** method overcomes the limitation of the traditional method and improves significantly precision and speed of displacement back analysis process.
The paper is given a new modified differentialevolution (MDE) algorithm in which a novel mutation operator is introduced. The MDE algorithm can obtain a good balance between global search and local search and was app...
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ISBN:
(纸本)9781424424948
The paper is given a new modified differentialevolution (MDE) algorithm in which a novel mutation operator is introduced. The MDE algorithm can obtain a good balance between global search and local search and was applied in BP neural network training. The numerical results demonstrate that the new MDE algorithm has the abilities of good global search and faster convergence speed and higher convergence accuracy. It can overcome the disadvantages of the traditional BP algorithm and reduce the training time and improve the training accuracy.
Reactive Power Management (RPM) is one of the most significant tasks for proper operation and control of a power system. Reactive Power Management reduces power system losses by adjusting the reactive power control va...
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ISBN:
(纸本)9781467309349
Reactive Power Management (RPM) is one of the most significant tasks for proper operation and control of a power system. Reactive Power Management reduces power system losses by adjusting the reactive power control variables such as generator voltages, transformer tap-settings and other sources of reactive power such as capacitor banks or FACTS devices. RPM provides better system voltage control resulting in improved voltage profile, system security, power transfer capability and overall system operation. RPM is a complex combinatorial optimization problem involving nonlinear functions having multiple local minima and nonlinear and discontinuous constraints. In this paper, the RPM problem is formulated as nonlinear constrained multi-objective optimization problem with equality and inequality constraints for minimization of power losses and voltage deviation simultaneously. This multi-objective problem is solved using differentialevolution (DE), which is a population based search algorithm. Weighing factor method has been employed for finding Pareto optimal set for RPM problem. Fuzzy membership function is used to find the best compromise solution out of the available Pareto-optimal solutions. The proposed approach has been demonstrated on the standard IEEE-30 bus system.
With the continuous expansion of power distribution grid, the number of distribution equipments has become larger and larger. In order to make sure that all the equipments can operate reliably, a large amount of maint...
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With the continuous expansion of power distribution grid, the number of distribution equipments has become larger and larger. In order to make sure that all the equipments can operate reliably, a large amount of maintenance tasks should be conducted. Therefore, maintenance scheduling of distribution network is an important content, which has significant influence on reliability and economy of distribution network operation. This paper proposes a new model for mainten-ance scheduling which considers load loss, grid active power loss and system risk as objective functions. On this basis, differential evolution algorithm is adopted to optimize equipment maintenance time and load transfer path. Finally, the general distribution network of 33 nodes is taken for example which shows the maintenance scheduling model's effec-tiveness and validity.
This paper presents two meta-heuristic algorithms to solve the quadratic assignment problem. The iterated greedy algorithm has two main components, which are destruction and construction procedures. The algorithm star...
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ISBN:
(纸本)9781467359047
This paper presents two meta-heuristic algorithms to solve the quadratic assignment problem. The iterated greedy algorithm has two main components, which are destruction and construction procedures. The algorithm starts from an initial solution and then iterates through a main loop, where first a partial candidate solution is obtained by removing a number of solution components from a complete candidate solution. Then a complete solution is reconstructed by inserting the partial solution components in the destructed solution. These simple steps are iterated until some predetermined termination criterion is met. We also present our previous discrete differential evolution algorithm modified for the quadratic assignment problem. The quadratic assignment problem is a classical NP-hard problem and its applications in real life are still considered challenging. The proposed algorithms were evaluated on quadratic assignment problem instances arising from real life problems as well as on a number of benchmark instances from the QAPLIB. The computational results show that the proposed algorithms are superior to the migrating birds optimization algorithm which appeared very recently in the literature. Ultimately, 7 out of 8 printed circuit boards (PCB) instances are further improved.
A new algorithm named differential evolution algorithm for Community Detection (DEACD) was proposed in the paper. DEACD used DE as its search engine and used the network modularity as the fitness function to search fo...
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A new algorithm named differential evolution algorithm for Community Detection (DEACD) was proposed in the paper. DEACD used DE as its search engine and used the network modularity as the fitness function to search for an optimal community partition of a network. In this algorithm, there is a modified binomial crossover mechanism to transmit some important information about the community structure in evolution effectively. In addition, a biased process and clean-up operation were employed in DEACD to improve the quality of the community partitions detected in evolution. Experimental results showed that DEACD has very competitive performance compared with other state-of-the-art community detection algorithms. In the process of evolution, the colony evolution was conducted under DE scheme, the network modularity was used to evaluate the fitness of individuals in the colony. The performance of DECD was analyzed by computer generated network and real-world network examples. The algorithm was implemented using matlab Genetic algorithm Optimization Toolbox (GAOT), and the parametric analysis was performed in the experiment.
In this paper, differentialevolution (DE), one of the youngest paradigms in evolutionary computation, is applied to the process of synthesizing a planar array factor focused on sidelobe-level reduction. Sidelobe leve...
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In this paper, differentialevolution (DE), one of the youngest paradigms in evolutionary computation, is applied to the process of synthesizing a planar array factor focused on sidelobe-level reduction. Sidelobe level is a critical array factor parameter in the task of reducing background noise and interference in the most recent Wireless Communications Systems. Minimization of sidelobe level involves nonlinear and non-convex dependence between array factor and its elements parameters becoming a highly complex problem. However, DE has proven to be a fast and efficient algorithm for complex real-valued problems. Subsequently, a binary-coded genetic algorithm is proposed for the synthesis of planar arrays. Numerical results show a promising performance ofDE reducing noticeably the sidelobe level generated by a uniform planar array. (C) 2006 Elsevier GmbH. All rights reserved.
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