期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
基于替代图的列车运行调整计划编制及优化方法 被引量:8
1
作者 王涛 张琦 +1 位作者 赵宏涛 苗义烽 《中国铁道科学》 EI CAS CSCD 北大核心 2013年第5期126-133,共8页
借助对列车优先级、节点、替代弧和替代对等参数的定义,以列车追踪运行间隔时间、列车连发间隔时间和列车间越行地点等为约束条件,以替代图中最长路径最短为优化目标,建立基于替代图的列车运行调整计划编制及优化模型。采用本地搜索算... 借助对列车优先级、节点、替代弧和替代对等参数的定义,以列车追踪运行间隔时间、列车连发间隔时间和列车间越行地点等为约束条件,以替代图中最长路径最短为优化目标,建立基于替代图的列车运行调整计划编制及优化模型。采用本地搜索算法对模型求解,经过原始计划生成和初级优化,得到有瑕疵(冲突)的但资源利用率较高的初始调整计划。当初始调整计划未满足需求或计划在实施过程中受到扰动需要修正时,采用分层多级优化分枝定界算法,对初始调整计划对应的替代图进行进一步的优化,得到优化的列车运行调整计划。由于替代图与列车运行调整计划的对应关系,用这2种算法对替代图分阶段求解和优化,可以得到满足不同需求的调整计划。通过对模拟环境的仿真,验证了模型和优化方法的完整性和可行性。 展开更多
关键词 列车运行调整计划 替代图 分枝定界算法 本地搜索算法 列车优先级
下载PDF
多类干扰下的高铁列车运行调整优化模型 被引量:8
2
作者 徐培娟 张大伟 +1 位作者 彭辉 刘丹 《铁道科学与工程学报》 CAS CSCD 北大核心 2021年第7期1723-1731,共9页
高速铁路列车运行实时调整一直是行车调度指挥工作中的重要核心任务之一。为解决有多种行车干扰事件(初始晚点、限速和到发线不可用)影响下的列车运行调整问题,针对准移动闭塞行车方式,基于替代图理论,兼顾车站进路调整约束,建立混合整... 高速铁路列车运行实时调整一直是行车调度指挥工作中的重要核心任务之一。为解决有多种行车干扰事件(初始晚点、限速和到发线不可用)影响下的列车运行调整问题,针对准移动闭塞行车方式,基于替代图理论,兼顾车站进路调整约束,建立混合整数线性优化模型,设计两阶段近似求解算法,在600 s内可以实现列车变更到发线次数最少和列车晚点延误时间最短的列车调整方案的快速求解。研究结果表明:模型可以同时实现列车运行调整和列车径路优化,相比时间间隔法行车方式,该模型可以有效避免列车在闭塞区间的冲突;有初始晚点的干扰会加剧列车的二次晚点;列车限速值越低会指数型加剧晚点时间。 展开更多
关键词 铁路运输 列车运行调整 替代图 到发线调整 准移动闭塞 两阶段近似算法
下载PDF
Analysis of the hotspots and trends in traditional Chinese medicine immunomodulation research based on bibliometrics 被引量:4
3
作者 XIAO Li MA Ning +2 位作者 LAI Han YAN Junfeng PENG Qinghua 《Digital Chinese Medicine》 2021年第2期81-91,共11页
Objective To analyze the intellectual structure,hotspots and trends of traditional Chinese medicine(TCM)in immune regulation research.Methods The data were extracted from the Web of Science Core Collection(WoSCC)and t... Objective To analyze the intellectual structure,hotspots and trends of traditional Chinese medicine(TCM)in immune regulation research.Methods The data were extracted from the Web of Science Core Collection(WoSCC)and the China National Knowledge Infrastructure(CNKI)and verified by two experienced TCM researchers.The time of literature retrieval is up to 2020.CiteSpace 5.7.R1 and Microsoft Excel 2016 were used for the statistical analysis and bibliometric diagrams,including the co-occurrence network of authors,institutions,countries,keywords,references,dual-map overlays of journals and citation bursts,etc.Results A total of 12270 publications related to TCM in immune regulation were included.The annual number of publications has increased in this field.There was close cooperation of countries and institutions,while the distribution of scholars was scattered.China was the core of the cooperation network.The dual-map overlays analysis of journals showed that core and marginal fields had increased.The keywords and references analysis showed that network pharmacology,metabolism and cancer were the most high-frequency keywords with high-intensity bursts.Conclusion TCM in immune regulation has attracted wider attention,with multi-country,multi-field,multi-disciplinary and multi-level research developing toward informatization.Network pharmacology,metabolism and cancer may be the focus of future research in this field. 展开更多
关键词 Traditional Chinese medicine(TCM) Knowledge graphs Complementary and alternative medicine BIBLIOMETRICS Immune regulation Citation bursts
下载PDF
Selecting Alternatives from Self-Organizing Product Maps for Purchase Decision Making Using AHP
4
作者 Kazuhiro Kohara 《Computer Technology and Application》 2013年第4期190-201,共12页
We previously proposed a method for creating product maps with SOM (Self-Organizing Maps) to be used during purchase decision making. In that study, we first established two class boundaries, which divide the area b... We previously proposed a method for creating product maps with SOM (Self-Organizing Maps) to be used during purchase decision making. In that study, we first established two class boundaries, which divide the area between the minimum and maximum range of an input feature value into three equal parts. Then, we produced self-organizing product maps using classification data inputs. Finally, we applied our method to five product types and confirmed its effectiveness. In this paper, we propose a method for selecting alternatives from a product map, in which we have located a favorite several examples of selecting alternatives and making decisions using cluster, and/or from a favorite component map. We then show the AHP (Analytic Hierarchy Process). 展开更多
关键词 Marketing decisions purchase decision making self-organizing maps selection of alternatives.
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部