排序方式: 共有65条查询结果,搜索用时 15 毫秒
61.
针对三角网格简化,设计了求解顶点覆盖问题的贪心算法,通过贪心选择最小的顶点集去"覆盖"边集,同时保留被简化网格的特征信息,自动实现最大程度简化。给出的实例也表明简化后的网格质量良好,算法既降低了时间复杂度又保持了原形状的特征信息。 相似文献
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Ehsan Ullah Munir Jian-zhong Li Sheng-fei Shi Zhao-nian Zou Qaisar Rasool 《浙江大学学报(A卷英文版)》2008,9(12):1715-1723
Heterogeneous computing (HC) environment utilizes diverse resources with different computational capabilities to solve computing-intensive applications having diverse computational requirements and constraints. The task assignment problem in HC environment can be formally defined as for a given set of tasks and machines, assigning tasks to machines to achieve the minimum makespan. In this paper we propose a new task scheduling heuristic, high standard deviation first (HSTDF), which considers the standard deviation of the expected execution time of a task as a selection criterion. Standard deviation of the expected execution time of a task represents the amount of variation in task execution time on different machines. Our conclusion is that tasks having high standard deviation must be assigned first for scheduling. A large number of experiments were carried out to check the effectiveness of the proposed heuristic in different scenarios, and the comparison with the existing heuristics (Max-min, Sufferage, Segmented Min-average, Segmented Min-min, and Segmented Max-min) clearly reveals that the proposed heuristic outperforms all existing heuristics in terms of average makespan. 相似文献
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以优化形式描述的集合覆盖问题是一个NP难问题,设计快速有效的近似算法,具有重要的理论与现实意义.基于贪心算法思想,提出了一种求解带权集合覆盖问题的近似算法,并讨论了该算法的相对近似比. 相似文献
65.
TSP问题及其解法研究 总被引:1,自引:0,他引:1
TSP问题是实际当中经常遇到的一类经典NP--hard组合优化问题之一。文章分别从贪心方法、动态规划、回溯法、分枝一限界法,这四种经典算法设计方法入手,概述了各种设计方法的基本原理,提出了求解TSP问题的算法思想,并对算法进行分析。 相似文献