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1.
研究分布估计算法可以解决难优化问题,且具有很好的全局搜索能力,但存在局部搜索能力差以及因种群多样性容易丧失从而导致的早熟收敛问题.针对上述问题对分布估计算法进行改进,将优势解集克隆,对优势个体进行搜索,从而增强局部搜索能力,并对概率模型进行修正以改善种群多样性损失问题,通过对多维背包问题的标准问题进行测试比较,结果表明了改进的有效性,改进后的算法增加了局部搜索能力、有效保持了种群多样性,获得好的优化结果.  相似文献   

2.
针对传统分布估计算法局部搜索能力弱,易陷入早熟收敛的问题,在分布估计算法的基础上引入精英策略并采用划分子种群独立进化的方式,提出一种基于精英协同的多种群分布估计算法。该算法混合了两种后代产生的策略:一种是进化过程采用精英协同操作用于进行局部搜索并开辟出新的搜索空间,另一种是采用划分子种群独立进化方式保证种群间个体的多样性。基准测试函数实验结果表明,该算法在收敛性和多样性方面均表现出明显优势。  相似文献   

3.
针对标准WOA算法初始种群分布不均、收敛速度较慢、全局搜索能力弱且易陷入局部最优等问题,提出一种混合策略改进的鲸鱼优化算法。采用Sobol序列初始化种群以使初始解在解空间分布更均匀;通过非线性时变因子和惯性权重平衡并提高全局搜索及局部开发能力,并结合随机性学习策略增加迭代过程中种群的多样性;引入柯西变异提升算法跳出局部最优的能力。通过对12个基准函数和一个水资源需求预测模型的参数估计进行优化实验,结果表明,基于混合策略改进的鲸鱼优化算法在寻优精度及收敛速度上均有明显提升。  相似文献   

4.
针对粒子群优化算法因种群多样性丧失而陷入局部最优、早熟收敛的问题,提出一种基于指数衰减惯性权重的分裂粒子群优化算法(EDW-DPSO)。首先,采用半均匀初始化种群,使种群以整体均匀、局部随机的方式分布;其次,引入动态分裂算子,对满足分裂条件的粒子执行分裂操作,增加种群多样性,避免粒子陷入局部最优;最后,采用指数衰减的惯性权重,平衡粒子全局搜索和局部开发能力。实验结果表明,该算法在前期有较大的搜索空间,种群多样性增加,后期则强调局部开发,提高收敛精度和优化能力,加快粒子跳脱局部极值逼近全局最优。  相似文献   

5.
布谷鸟搜索算法是一种基于种群迭代搜索的全局优化算法。为求解无约束优化问题,提出一种改进的布谷鸟搜索算法。利用混沌序列构造初始种群以增加群体的多样性,引入动态随机局部搜索技术对当前最优解进行局部搜索,以加快算法的收敛速度。对4个标准测试函数进行仿真实验,并与其他6种算法进行比较,结果表明,该算法具有较强的全局搜索能力和较快的收敛速度。  相似文献   

6.
为了有效地解决人工蜂群算法容易陷入局部最优的缺陷,提出了一种改进蜂群算法。首先,利用反向学习方法构建初始种群,以提高初始化解的质量。同时,利用分布估计算法构造优秀个体解空间的概率模型以进行邻域搜索,以改善算法的搜索性能并防止陷入局部最优。对连续空间优化问题进行了仿真实验,结果表明改进算法具有较快的收敛速度,全局寻优能力显著提高。  相似文献   

7.
付强  葛洪伟  苏树智 《计算机应用》2016,36(12):3298-3302
粒子群优化(PSO)算法具有易陷入局部最小值和全局搜索能力差的缺陷,对PSO算法的改进大多只是在某一方面利用单一搜索策略进行改进,针对这种改进策略不能全面优化PSO算法性能的问题,提出一种引入萤火虫行为和Levy飞行的粒子群优化(FBLFPSO)算法。根据改进的自调节步长的萤火虫搜索策略改善PSO的局部搜索能力,避免PSO陷入局部最小值;后期利用Levy飞行策略增强种群多样性,提高PSO全局搜索能力,跳出局部最优解。仿真实验结果表明,与现有相关算法相比,FBLFPSO的全局搜索能力和搜索精度都有较大提高。  相似文献   

8.
针对引力搜索算法局部搜索能力较弱,搜索过程容易出现早熟的现象,提出一种基于多样性和局部优化能力协同优化的引力搜索算法。将粒子群算法中局部最优解和细菌趋化中排斥操作的概念引入到引力搜索算法中,通过帮助粒子接近最优位置和逃离最差位置,改进了搜索算法中粒子的局部优化能力及种群多样性,并使用标准函数进行测试。结果表明,该算法能够实现全局搜索与局部搜索的平衡,最大程度地保持种群多样性,提高算法搜索能力。  相似文献   

9.
针对在求解高维多峰值复杂问题时种群容易陷入局部搜索、求解精度低的问题,提出了一种基于自适应差分进化算法和小生境高斯分布估计的文化算法。将差分进化算法用于种群空间的优化,利用动态小生境识别算法在种群空间中识别小生境群体。信度空间利用高斯分布估计算法在小生境内进行局部优化,并将小生境特征存入进化知识库,进化知识库进一步引导种群空间,有效地保证了种群的多样性,避免了局部的重复搜索。最后,通过仿真实验测试表明,算法具有收敛速度快、求解精度高、稳定性高和全局搜索能力强等优势。  相似文献   

10.
针对基本麻雀搜索算法(sparrow search algorithm,SSA)在处理复杂优化问题时存在的搜索空间不足、收敛速度慢和易陷入局部最优等问题,提出一种多策略混合的改进麻雀搜索算法(improved sparrow search algorithm based on multi-strategy mixing,IMSSA)。利用Sine混沌映射初始化麻雀个体位置,丰富种群多样性,解决种群分布不均匀、搜索空间不足等问题;引入带有惯性权重的多样性全局最优引导策略来加快收敛速度,调控算法的全局探索与局部开发能力;采用双样本学习策略使算法跳出局部最优,提高种群对解空间的搜索能力。通过测试函数对算法进行仿真实验,验证三种改进策略的有效性,并且进行Wilcoxon秩和检验和时间复杂度分析,结果表明IMSSA算法的各项性能均有显著提升。最后用算法优化支持向量机参数,建立轴承故障诊断模型,进一步证明了改进策略是可行有效的。  相似文献   

11.
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.  相似文献   

13.
融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。  相似文献   

14.
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.  相似文献   

15.
This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.  相似文献   

16.
Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008  相似文献   

17.
《计算机科学》2007,34(4):148-148
Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.  相似文献   

18.
为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.  相似文献   

19.
Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.  相似文献   

20.
This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)SM and Team Software Process (TSP){SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.  相似文献   

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