| 极大化提前完工总量平行机排序问题的LPT算法 |
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| 引用本文： | 周萍,季敏,蒋义伟.极大化提前完工总量平行机排序问题的LPT算法[J].运筹学学报,2021,26(3):151-156. |
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| 作者姓名： | 周萍 季敏 蒋义伟 |
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| 作者单位： | 1. 浙江商业职业技术学院人文学院, 浙江杭州 310053;2. 浙江工商大学管理工程与电子商务学院, 浙江杭州 310018 |
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| 基金项目： | 浙江省教育厅高校国内访问学者"教师专业发展项目"(FX2020093);国家自然科学基金(11971434);国家自然科学基金(11871327) |
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| 摘 要： | 研究带有共同交货期的三台平行机排序问题。工件在加工过程中不允许中断, 目标是极大化所有工件的提前完工量, 即在交货期前所加工工件(或部分) 的总加工时长。由于该问题是NP-难问题, 本文应用经典LPT算法来解决该问题。我们证明了LPT算法求解该问题的最坏情况界至多为$\frac{15}{13}$, 并给出实例说明最坏情况界的下界为$\frac{27}{25}$。
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| 关 键 词： | 平行机排序 LPT算法 最坏情况界 提前完工总量 |
| 收稿时间： | 2022-01-20 |
LPT heuristic for parallel-machine scheduling of maximizing total early work |
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| Ping ZHOU,Min JI,Yiwei JIANG.LPT heuristic for parallel-machine scheduling of maximizing total early work[J].OR Transactions,2021,26(3):151-156. |
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| Authors: | Ping ZHOU Min JI Yiwei JIANG |
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| Institution: | 1. College of Humanities, Zhejiang Business College, Hangzhou 310053, Zhejiang, China;2. School of Management and E-Business, Zhejiang Gongshang University, Hangzhou 310018, Zhejiang, China |
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| Abstract: | This paper considers the problem of scheduling on three identical machines with a common due date. The preemption is not allowed. The goal is to maximize the total early work of all the jobs, i.e., the total processing time of all the jobs (or part) completed before the common due date. Since the problem is NP-hard, we apply the classical heuristic, namely longest processing time (LPT), to tackle the problem. We show that the worst-case ratio of LPT is at most $\frac{15}{13}$ and the lower bound of the worst-case ratio is at least $\frac{27}{25}$ by providing an instance. |
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| Keywords: | parallel-machine scheduling LPT heuristic worst-case ratio total early work |
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