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基于混沌变异的小生境粒子群算法 总被引:17,自引:0,他引:17
针对粒子群算法早熟收敛和搜索精度低的问题,提出了基于混沌变异的小生境粒子群算法(NCPSO).该算法结合小生境技术并加入了淘汰机制,使算法具有良好的全局寻优能力.变尺度混沌变异具有精细的局部遍历搜索性能·使算法具有较高的搜索精度.实验结果表明,NCPSO算法可有效避免标准PSO算法的早熟收敛,具有寻优能力强、搜索精度高、稳定性好等优点.适合于工程应用中的复杂函数优化问题. 相似文献
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Weilin Du 《Information Sciences》2008,178(15):3096-3109
Optimization in dynamic environments is important in real-world applications, which requires the optimization algorithms to be able to find and track the changing optimum efficiently over time. Among various algorithms for dynamic optimization, particle swarm optimization algorithms (PSOs) are attracting more and more attentions in recent years, due to their ability of keeping good balance between convergence and diversity maintenance. To tackle the challenges of dynamic optimization, several strategies have been proposed to enhance the performance of PSO, and have gained success on various dynamic optimization problems. But there still exist some issues in dynamic optimization which need to be studied carefully, i.e. the robustness of the algorithm to problems of various dynamic features. In this paper, a new multi-strategy ensemble particle swarm optimization (MEPSO) for dynamic optimization is proposed. In MEPSO, all particles are divided into two parts, denoted as part I and part II, respectively. Two new strategies, Gaussian local search and differential mutation, are introduced into these two parts, respectively. Experimental analyses reveal that the mechanisms used in part I can enhance the convergence ability of the algorithm, while mechanisms used in part II can extend the searching area of the particle population to avoid being trapped into the local optimum, and can enhance the ability of catching up with the changing optimum in dynamic environments. The whole algorithm has few parameters that need to be tuned, and all of them are not sensitive to problems. We compared MEPSO with other PSOs, including MQSO, PHPSO and Standard PSO with re-initialization, on moving peaks Benchmark and dynamic Rastrigin function. The experimental results show that MEPSO has pretty good performance on almost all testing problems adopted in this paper, and outperforms other algorithms when the dynamic environment is unimodal and changes severely, or has a great number of local optima as dynamic Rastrigin function does. 相似文献
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DongLi Jia GuoXin Zheng BoYang Qu Muhammad Khurram Khan 《Computers & Industrial Engineering》2011,61(4):1117-1122
In recent years, particle swarm optimization (PSO) emerges as a new optimization scheme that has attracted substantial research interest due to its simplicity and efficiency. However, when applied to high-dimensional problems, PSO suffers from premature convergence problem which results in a low optimization precision or even failure. To remedy this fault, this paper proposes a novel memetic PSO (CGPSO) algorithm which combines the canonical PSO with a Chaotic and Gaussian local search procedure. In the initial evolution phase, CGPSO explores a wide search space that helps avoid premature convergence through Chaotic local search. Then in the following run phase, CGPSO refines the solutions through Gaussian optimization. To evaluate the effectiveness and efficiency of the CGPSO algorithm, thirteen high dimensional non-linear scalable benchmark functions were examined. Results show that, compared to the standard PSO, CGPSO is more effective, faster to converge, and less sensitive to the function dimensions. The CGPSO was also compared with two PSO variants, CPSO-H, DMS-L-PSO, and two memetic optimizers, DEachSPX and MA-S2. CGPSO is able to generate a better, or at least comparable, performance in terms of optimization accuracy. So it can be safely concluded that the proposed CGPSO is an efficient optimization scheme for solving high-dimensional problems. 相似文献
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An improved vector particle swarm optimization for constrained optimization problems 总被引:1,自引:0,他引:1
Increasing attention is being paid to solve constrained optimization problems (COP) frequently encountered in real-world applications. In this paper, an improved vector particle swarm optimization (IVPSO) algorithm is proposed to solve COPs. The constraint-handling technique is based on the simple constraint-preserving method. Velocity and position of each particle, as well as the corresponding changes, are all expressed as vectors in order to present the optimization procedure in a more intuitively comprehensible manner. The NVPSO algorithm [30], which uses one-dimensional search approaches to find a new feasible position on the flying trajectory of the particle when it escapes from the feasible region, has been proposed to solve COP. Experimental results showed that searching only on the flying trajectory for a feasible position influenced the diversity of the swarm and thus reduced the global search capability of the NVPSO algorithm. In order to avoid neglecting any worthy position in the feasible region and improve the optimization efficiency, a multi-dimensional search algorithm is proposed to search within a local region for a new feasible position. The local region is composed of all dimensions of the escaped particle’s parent and the current positions. Obviously, the flying trajectory of the particle is also included in this local region. The new position is not only present in the feasible region but also has a better fitness value in this local region. The performance of IVPSO is tested on 13 well-known benchmark functions. Experimental results prove that the proposed IVPSO algorithm is simple, competitive and stable. 相似文献
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为提升粒子群优化算法在复杂优化问题,特别是高维优化问题上的优化性能,提出一种基于Solis&Wets局部搜索的反向学习竞争粒子群优化算法(solis and wets-opposition based learning competitive particle swarm optimizer with local se... 相似文献
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基于分层多子群的混沌粒子群优化算法 总被引:2,自引:0,他引:2
在分层多子群结构模型的基础上,提出一种混沌粒子群优化算法(HCPSO).该算法对非线性递减的惯性权重进行混沌变异,并采用了混沌搜索方法.在更新全局历史最优位置每一维分量时,选取不同的若干个体作为学习对象,并计算它们的平均位置.混沌搜索区域半径可根据粒子个体最优位置与上述平均位置间的距离自适应地调整.通过对几种典型函数的测试结果表明,该算法具有较好的全局搜索和局部搜索能力,可有效避免早熟收敛问题. 相似文献
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粒子群优化算法求解多目标优化问题存在早熟收敛和后期收敛速性差的不足,解的分布性也有待提高。为此设计一种新的多目标粒子群优化算法:对寻求粒子最优解的sigma方法进行改进,提出一种综合非支配解密度信息和sigma值的最优解求解机制。对变异粒子速度进行矢量扰动变异;对停滞粒子进行位置变异,有效避免算法的早熟收敛问题。测试结果表明,所提出的算法在收敛性和解的分布性、多样性方面较经典的算法具有明显的优势。 相似文献
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In recent years, particle swarm optimization (PSO) has extensively applied in various optimization problems because of its simple structure. Although the PSO may find local optima or exhibit slow convergence speed when solving complex multimodal problems. Also, the algorithm requires setting several parameters, and tuning the parameters is a challenging for some optimization problems. To address these issues, an improved PSO scheme is proposed in this study. The algorithm, called non-parametric particle swarm optimization (NP-PSO) enhances the global exploration and the local exploitation in PSO without tuning any algorithmic parameter. NP-PSO combines local and global topologies with two quadratic interpolation operations to increase the search ability. Nineteen (19) unimodal and multimodal nonlinear benchmark functions are selected to compare the performance of NP-PSO with several well-known PSO algorithms. The experimental results showed that the proposed method considerably enhances the efficiency of PSO algorithm in terms of solution accuracy, convergence speed, global optimality, and algorithm reliability. 相似文献
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一种新的混合粒子群优化算法 总被引:3,自引:3,他引:3
针对标准粒子群算法在优化过程中受初始值影响较大且容易陷入局部极值的缺陷,将鱼群算法中聚群行为的基本思想引入粒子群算法中,据此建立了粒子中心的基本概念,并利用粒子的聚群特性调整粒子的飞行方向与目标位置,从而提出了一种新的混合粒子群算法,旨在改进原粒子群算法的全局收敛能力。为了检验混合粒子群算法的优化特性,采用三种典型的标准函数对五种现行智能算法进行了多方面的测试和比较。实验结果表明,新算法具有良好的搜索精度与速度,有效弥补了标准粒子群算法局部收敛和鱼群算法精度不高的双重缺陷,适用于解决复杂函数优化问题。 相似文献
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In this paper, we propose a method for solving constrained optimization problems using interval analysis combined with particle swarm optimization. A set inverter via interval analysis algorithm is used to handle constraints in order to reduce constrained optimization to quasi unconstrained one. The algorithm is useful in the detection of empty search spaces, preventing useless executions of the optimization process. To improve computational efficiency, a space cleaning algorithm is used to remove solutions that are certainly not optimal. As a result, the search space becomes smaller at each step of the optimization procedure. After completing pre-processing, a modified particle swarm optimization algorithm is applied to the reduced search space to find the global optimum. The efficiency of the proposed approach is demonstrated through comprehensive experimentation involving 100 000 runs on a set of well-known benchmark constrained engineering design problems. The computational efficiency of the new method is quantified by comparing its results with other PSO variants found in the literature. 相似文献
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Visual search reranking involves an optimization process that uses visual content to recover the “genuine” ranking list from the helpful but noisy one generated by textual search. This paper presents an evolutionary approach, called Adaptive Particle Swarm Optimization (APSO), for unsupervised visual search reranking. The proposed approach incorporates the visual consistency regularization and the ranking list distance. In addition, to address the problem that existing list distance fails to capture the genuine disagreement between two ranking lists, we propose a numerical ranking list distance. Furthermore, the parameters in APSO are self-tuned adaptively according to the fitness values of the particles to avoid being trapped in local optima. We conduct extensive experiments on automatic search task over TRECVID 2006-2007 benchmarks and show significant and consistent improvements over state-of-the-art works. 相似文献
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This paper proposes a novel hybrid approach based on particle swarm optimization and local search, named PSOLS, for dynamic optimization problems. In the proposed approach, a swarm of particles with fuzzy social-only model is frequently applied to estimate the location of the peaks in the problem landscape. Upon convergence of the swarm to previously undetected positions in the search space, a local search agent (LSA) is created to exploit the respective region. Moreover, a density control mechanism is introduced to prevent too many LSAs crowding in the search space. Three adaptations to the basic approach are then proposed to manage the function evaluations in the way that are mostly allocated to the most promising areas of the search space. The first adapted algorithm, called HPSOLS, is aimed at improving PSOLS by stopping the local search in LSAs that are not contributing much to the search process. The second adapted, algorithm called CPSOLS, is a competitive algorithm which allocates extra function evaluations to the best performing LSA. The third adapted algorithm, called CHPSOLS, combines the fundamental ideas of HPSOLS and CPSOLS in a single algorithm. An extensive set of experiments is conducted on a variety of dynamic environments, generated by the moving peaks benchmark, to evaluate the performance of the proposed approach. Results are also compared with those of other state-of-the-art algorithms from the literature. The experimental results indicate the superiority of the proposed approach. 相似文献
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Y. G. Petalas K. E. Parsopoulos M. N. Vrahatis 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2009,13(1):77-94
Fuzzy cognitive maps constitute a neuro-fuzzy modeling methodology that can simulate complex systems accurately. Although
their configuration is defined by experts, learning schemes based on evolutionary and swarm intelligence algorithms have been
employed for improving their efficiency and effectiveness. This paper comprises an extensive study of the recently proposed
swarm intelligence memetic algorithm that combines particle swarm optimization with both deterministic and stochastic local
search schemes, for fuzzy cognitive maps learning tasks. Also, a new technique for the adaptation of the memetic schemes,
with respect to the available number of function evaluations per application of the local search, is proposed. The memetic
learning schemes are applied on four real-life problems and compared with established learning methods based on the standard
particle swarm optimization, differential evolution, and genetic algorithms, justifying their superiority. 相似文献