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朴素贝叶斯算法是一种简单而高效的分类算法,但它的属性独立性假设,影响了它的分类性能。针对这个问题,提出一种基于属性约简的PLS加权朴素贝叶斯分类算法。该算法首先分析属性之间的相关性,通过属性约简选择一组近似独立的属性约简子集,提出改进的偏最小二乘回归加权朴素贝叶斯分类算法,实验结果表明,改进算法具有较高的分类准确度。并将改进的算法应用于边坡识别问题中。 相似文献
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在传统模拟退火算法的基础上,对装箱问题的优化算法进行了研究。结合装箱问题的具体特点,采用SP序列对来描述模块间的拓扑关系,并通过精细的模拟退火策略(精细的降温策略,提前退出策略),以及增量式的新解评估策略对算法进行优化。试验结果表明,相比传统的模拟退火框架,改进的算法能够取得较好的运行时间与面积利用率。 相似文献
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实验预约系统的核心任务是生成实验教学课表,课表的生成是一个典型的组合优化问题,模拟退火算法是解决此类问题的优秀算法之一。本文主要研究了模拟退火算法的原理与特性,并将其应用于实验教学预约系统的排课模块中,更好地提高排课效率,改善排课效果。 相似文献
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根据电子商务环境下物流配送系统的特点,建立了带时间窗的车辆优化调度问题的数学模型。设计了一种混合遗传算法,在求解的过程中加入了模拟退火操作,对每一代中的每个个体进行邻域搜索并依据模拟退火中的接受概率选择邻域个体,然后再进行选择、交叉、变异等遗传操作,以此来克服遗传算法早熟收敛的缺陷。用此混合遗传算法对模型进行求解,通过仿真实例计算,并与遗传算法比较,取得了满意的结果。 相似文献
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聚类分析是客户关系管理(CRM)中非常重要的工具之一.提出一种新的算法,k-centers,通过重新定义相似度衡量和聚类中心更新方法,能够有效处理混合类型的CRM数据。以解决经典算法比如k-means等只适用于数值类型数据的不足,实验分析说明k-tenters算法能够准确把握不同类型客户的特征,为个性化的市场营销提供有力支持。 相似文献
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本文分析了该算法的主要参数对搜索方向的影响,并对粒子群优化算法在桁架结构优化设计中的应用进行了分析。利用粒子群优化算法与遗传算法分别对两个桁架结构优化设计算例进行求解,将两种算法的计算结果进行了对比,计算结果表明在满足相同的计算精度的前提下,粒子群优化算法的效率更高。因此,基于粒子群算法的结构优化设计是切实可行的。 相似文献
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《Socio》2016
Heuristic algorithms have been widely used to provide computationally feasible means of exploring the cost effective balance between grid versus off grid sources for universal electrification in developing countries. By definition in such algorithms however, global optimality is not guaranteed. We present a computationally intensive but globally optimal mixed integer non-linear programming (MINLP) model for electricity planning and use it in a Monte Carlo simulation procedure to test the relative performance of a widely used heuristic algorithm due to [28]. We show that the overall difference in cost is typically small suggesting that the heuristic algorithm is generally cost effective in many situations. However we find that the relative performance of the heuristic algorithm deteriorates with increasing degree of spatial dispersion of unelectrified settlements, as well as increasing spatial remoteness of the settlements from the grid network, suggesting that the effectiveness of the heuristic algorithm is context specific. Further, we find that allocation of off grid sources in the heuristic algorithm solution is often significantly greater than in the MINLP model suggesting that heuristic methods can overstate the role of off-grid solutions in certain situations. 相似文献
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随着全球化竞争的加剧和客户要求的不断提高、传统的生产管理方式使企业无法应对激烈竞争的挑战。量子粒子群算法是将量子计算理论和基本粒子群算法相结合的一种崭新的优化算法。将量子粒子群算法用于求解生产、采购集成决策问题。仿真结果证明了量子粒子群算法在供应链集成决策问题上的可行性、有效性和优越性。 相似文献
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This paper presents the location-allocation problem of parking facilities in Mobarakeh Steel Company. The aim is to find the optimal location for the parking facilities and allocate travels between departments to each parking facility. To optimize the cost and facing the transportation demands of all departments, a mathematical model is designed and solved by a commercial software package. Also, the number of vehicles allocated to each parking facility is determined. A hybrid meta-heuristic algorithm combining a genetic algorithm with parallel simulated annealing is developed which can be used even in more complicated structure of the problem. The results show that this hybrid algorithm is highly efficient in solving this kind of problems. 相似文献
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数据挖掘中的ID3算法是决策树中的重要算法,它适合于从海量信息中获取有益信息。通过一个实例对ID3算法进行了详细的分析论述,并将ID3算法应用于高校教学评价中。实验证明,ID3算法在高校教学改革中有重要的辅助指导作用. 相似文献
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课表问题又称为时间表问题(Timetable Problem),是一个多因素的优化决策问题,也是组合规划中的典型问题。本文从排课系统研发和运行中存在的问题出发,从遗传算法的基本理论入手,研究如何利用遗传算法,解决时间安排过程中的资源冲突(主要是教师资源和时间资源)、课表时间段组合优化等问题。 相似文献
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研究了遗传算法在物流系统配送网点的选址问题中的优势,并依据物流系统配送网点选址的实际情况给出了基于遗传算法的物流系统配送网点选址的具体实现过程和算例。 相似文献
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《Socio》2021
We propose a novel method and algorithm for the analysis and clustering of mixed-type data using a hierarchical approach based on Forward Search. In our procedure, the identification of groups is based on the identification of similar trajectories and then linked to very intuitive two-dimensional maps. The proposed algorithm can use different measures for the calculation of distance in the case of mixed-type data, such as Gower’s metric and Related metric scaling. A key feature of our algorithm is its ability to discard redundant information from a given set of variables. The practical usefulness of the algorithm is illustrated through two applications of high relevance for empirical economic research. The first one focuses on comparing different indicators of environmental policy stringency in different countries. The second one applies our procedure to identify clusters of countries based on information regarding their institutional characteristics. 相似文献