共查询到19条相似文献,搜索用时 62 毫秒
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针对基本和声搜索算法的不足,提出一种改进的和声搜索算法.首先在和声搜索算法的记忆库中加入权重,减少搜索的随机性;其次让扰动方程中的带宽具有自适应性,从而提高原算法的鲁棒性和收敛速度.算法在计算机上予以实现,并通过一系列测试函数求解,验证了改进算法与基本和声搜索算法及其他智能算法相比,能得到更多的最优解和较小的方差. 相似文献
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自适应和声粒子群搜索算法 总被引:9,自引:0,他引:9
针对现有改进和声搜索算法(IHS)的不足,提出一种自适应和声粒子群搜索算法(AHSPSO).首先对和声记忆库中每个变量用粒子群算法寻优,再利用自适应参数PAR和bw调节来提高对多维问题的搜索效率.利用5个标准的优化算法测试函数对AHSPSO算法进行测试,并与IHS,PSO和SA算法进行对比,仿真结果表明了AHSPSO算法具有较强的精确寻优和跳出局部最优的能力. 相似文献
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针对标准和声搜索(HS)算法易陷入局部最优、收敛精度不高的不足,提出了一种基于圆形信赖域(CTR)的新型和声搜索算法--CTRHS。该算法运用逐双音调一次性产生方式,在记忆思考环节交互式地采取面向圆形信赖域的集约化思考操作,在双音调微调环节利用当前和声记忆库中的最好或最差和声来确定微调带宽,并且以新生成和声直接替换当前和声记忆库中最差和声来实现和声记忆库的更新。通过在9种标准测试函数上对CTRHS算法进行实验验证和算法性能对比,结果表明CTRHS算法在解质量、收敛性能上优于文献中已报道的7种HS改进算法,且当和声记忆库规模(HMS)、和声记忆库思考率(HMCR)分别取5和0.99时,它能表现出更佳的全局优化性能。 相似文献
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和声搜索(HS)是一种已广泛应用于连续优化问题的元启发式方法。针对典型的组合优化问题——多维背包问题(MKP),提出一种改进二进制和声搜索(IBHS)算法。算法通过伯努利随机过程生成二进制群体,在候选和声生成算子中,引入动态自适应参数,通过算法参数的自适应调整来协调算法的全局搜索和局部搜索,并提出一种新的更有效的衡量商品多维加权价值密度的方法用于二进制个体修正和优化;引入精英局部搜索机制进行协同寻优,提高IBHS的收敛速度。通过求解10组不同规模的典型多维背包算例和与贪心二进制狮群优化(GBLSO)算法、改进的差分演化(MBDE)算法以及二进制修正和声(BMHS)算法的对比分析,实验结果表明,所提算法在求解MKP时有具有良好的收敛效率、较高的寻优精度和很好的鲁棒性。 相似文献
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人力资源分配问题是将若干个人力资源合理分配给若干个工作任务,从而达到人力生产效率最大化与人力生产成本最小化。文中提出一种改进的多目标和声搜索(MOIHS)算法来求解人力资源分配问题。MOIHS算法是通过改变记忆考虑的选择机制与微调概率来改进基本的和声算法提高算法收敛稳定性,并采用快速非支配排序方法与建立动态拥挤的距离来获得一个分布良好的Pareto解集。在求解人力资源分配问题时,同时优化人力生产成本最小化与效率最大化两个目标,最后通过一个实例可以得到在解决该问题上多目标改进和声搜索算法优于多目标遗传算法,求出的解集也具有良好的分布性。 相似文献
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设计了一种改进的和声搜索算法对一般的整数规划问题进行求解,在计算机上予以实现。经实验测试,相对遗传模拟退火算法和混合遗传算法,获得了同样甚至更好的解。由于改进和声搜索算法使用灵活,因此对于线性和非线性的整数规划问题都能进行求解。 相似文献
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Hakk? Murat Genç Osman Kaan Erol?brahim Eksin Mehmet Fatih BerberBinnur Onaran Güleryüz 《Expert systems with applications》2012,39(1):316-327
An appropriate and efficient gate assignment is of great importance in airports since it plays a major role in the revenue obtained from the airport operations. In this study, we have focused mainly on maximum gate employment, or in other words minimize the total duration of un-gated flights. Here, we propose a method that combines the benefits of heuristic approaches with some stochastic approach instead of using a purely probabilistic approach to top-down solution of the problem. The heuristic approaches are usually used in order to provide a fast solution of the problem and later stochastic searches are used in order to ameliorate the previous results of the heuristic approach whenever possible. The proposed method generates an assignment order for the whole planes that corresponds to assignment priority. The ordering process is followed by the allocation step. Since, in practice, each airport has its own physical architecture, there have been arisen many constraints mainly concerning airplane types and parking lots in this step. Sequentially handling the plane ordering and allocation phases provides us great modularity in handling the constraints. The effectiveness of the proposed methodology has been tried to be illustrated firstly on fictively generated flight schedule data and secondly on the real world data obtained from a real world application developed for ?stanbul Atatürk Airport. 相似文献
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The problem of assigning gates to arriving and departing flights is one of the most important problems in airport operations. We take into account the real multi-criteria nature of the problem by optimizing a total of nine gate allocation objectives that are oriented both on convenience for airport/airline services and passenger comfort. As far as we are aware, this is the largest number of objectives jointly optimized in the GAP literature. Given the complexity of the considered problem, we propose a heuristic approach based on the Breakout Local Search (BLS) framework. BLS is a recent variant of the Iterated Local Search (ILS) with a particular focus on the perturbation strategy. Based on some relevant information on search history, it tries to introduce an appropriate degree of diversification by determining adaptively the number and type of moves for the next perturbation phase. Moreover, we use a new memory-based greedy constructive heuristic to generate a starting point for BLS. Benchmark instances used for our experiments and comparisons are based on information provided by Manchester Airport. 相似文献
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利用改进的和声搜索算法求解Van Genuchten方程参数 总被引:1,自引:0,他引:1
Van Genuchten方程是最常用的土壤水分特征曲线方程,运用该方程的关键是4个参数的取值精度。为了精确地求解这些参数,引入和声搜索(HS)算法进行求解,提出一种基于全局信息的和声搜索优化计算方法——IGHS。IGHS算法具有如下特点:利用当前和声记忆库中的全局最优解产生新解,改变了和声搜索算法新解的产生方式;通过对和声记忆库中当前最优解的扰动避免算法早熟,增强算法的全局搜索能力;IGHS算法结构简单,容易实现。实验结果表明IGHS算法求解Van Genuchten方程参数的精度与随机微粒群结果相似,但其收敛速快、计算量小,因此可以作为计算Van Genuchten方程参数的新方法。 相似文献
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《Computers & Operations Research》2005,32(7):1867-1880
In this paper, we study the over-constrained airport gate assignment problem where the objectives are to minimize the number of ungated flights and total walking distances or connection times. We first use a greedy algorithm to minimize ungated flights. Exchange moves are employed to facilitate the use of heuristics. Simulated annealing and a hybrid of simulated annealing and tabu search are used. Experimental results are good and exceed those previously obtained. 相似文献
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针对标准和声搜索算法存在收敛不稳定及不能用于多目标优化问题的缺陷,通过引入交叉算子、自适应记忆内搜索概率和调节概率,改进了传统的和声搜索算法;根据Pareto支配关系,结合算法和声记忆库内信息完全共享的特性,提出了基于动态Pareto最优前沿的能够求解多目标优化问题的多目标改进和声搜索算法。通过几个典型函数的仿真测试表明,提出的算法能够高效稳定地收敛于Pareto最优前沿,获得分布均匀的Pareto解集。 相似文献
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针对批量流水线调度问题,提出了以总流经时间为目标的改进离散和声算法。与基本的和声算法相比,该算法首先采用了基于工件序列的编码方式,使其直接应用于调度问题,同时运用NEH和SWAP方法产生初始和声库,保证了初始种群具有较高的质量和多样性。使用自适应和声微调概率参数和INSERT方法产生新解,提高了算法的优化性能。为了提高算法的局部搜索能力,结合交换扰动策略和插入邻域搜索算法给出了两种混合求解策略。仿真实验表明所提算法的有效性。 相似文献
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Pierre-Emmanuel Hladik Hadrien Cambazard Narendra Jussien 《Journal of Systems and Software》2008,81(1):132-149
In this paper, we present an original approach (CPRTA for “Constraint Programming for solving Real-Time Allocation”) based on constraint programming to solve a static allocation problem of hard real-time tasks. This problem consists in assigning periodic tasks to distributed processors in the context of fixed priority preemptive scheduling. CPRTA is built on dynamic constraint programming together with a learning method to find a feasible processor allocation under constraints. Two efficient new approaches are proposed and validated with experimental results. Moreover, CPRTA exhibits very interesting properties. It is complete (if a problem has no solution, the algorithm is able to prove it); it is non-parametric (it does not require specific tuning) thus allowing a large diversity of models to be easily considered. Finally, thanks to its capacity to explain failures, it offers attractive perspectives for guiding the architectural design process. 相似文献