上海治理论坛第505期
问题:笼罩约束p-中值问题的Benders剖析算法
演讲人:戴彧虹教授,,中科院数学与系统研究院
主持人:林贵华教授,,8188cc威尼斯治理学院
时间:2023年10月12日(周四),,下昼15:00
所在:8188cc威尼斯校本部东区治理学院420室
主理单位:8188cc威尼斯治理学院、8188cc威尼斯治理学院青年西席联谊会
演讲人简介:
国际着名优化专家,,中科院数学与系统研究院研究员、副院长。。。。
中国运筹学会理事长,,亚太运筹学会联合会主席。。。。
主持国家杰青项目、重点研发妄想项目、立异研究群体项目等。。。。
曾获国家自然科学二等奖、中国青年科技奖、钟家庆数学奖、冯康科学盘算奖、陈省身数学奖、首届萧树铁应用数学奖等。。。。
演讲内容简介:
In this talk, we study the p-median problem with the addition of a coverage constraint which requires the total customer demand, covered at a distance greater than a prespecified coverage distance, to be smaller than or equal to a given threshold. We propose an efficient Benders decomposition (BD) approach for solving large-scale problems. We show that both Benders feasibility and optimality cuts can be separated in efficient combinatorial polynomial-time algorithms. Moreover, we enhance the BD approach by using tight initial cuts to initialize the relaxed master problem, implementing an effective two-stage algorithm to find high-quality solutions, and adding valid inequalities to strengthen the problem formulation. Computational results on benchmark instances show that the proposed BD approach outperforms the state-of-the-art general-purpose MIP solver's branch-and-cut and automatic BD algorithms by at least one order of magnitude.
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