研究绿色同时取送货车辆调度问题,提出改进的遗传禁忌搜索算法(Genetic Algorithm with Tabu Search,GA-TS)求解该问题。模型中,以服务成本、油耗成本和碳排放成本构成的总成本最小为目标,采用了综合模型计算油耗和碳排放成本,引入三角...研究绿色同时取送货车辆调度问题,提出改进的遗传禁忌搜索算法(Genetic Algorithm with Tabu Search,GA-TS)求解该问题。模型中,以服务成本、油耗成本和碳排放成本构成的总成本最小为目标,采用了综合模型计算油耗和碳排放成本,引入三角模糊数来描述客户需求的不确定性,并考虑同时取送货需求。在改进的GA-TS算法中,将惩罚因子引入适应度函数,采用结合精英策略的选择算子,提出结合禁忌搜索算法的变异算子。在案例分析中,采用田口分析法获取合理的参数设置,通过案例结果分析和算法对比分析验证模型和算法的有效性和先进性。展开更多
China is a mountainous country with a great diversity of landform and geomorphology.This diversity underlines the need for regionalization and classification.This study defines the mountain terrains and regions with t...China is a mountainous country with a great diversity of landform and geomorphology.This diversity underlines the need for regionalization and classification.This study defines the mountain terrains and regions with three criteria-elevation,relative height,and slope,and examines the extent of mountainous regions by using county as the basic administrative unit.According to the three parameters of economic base,resident income and development potential,we classified the economic development level in mountainous regions of China.The findings reveal that the extent of the mountainous region accounts for 74.9% of the China's Mainland's total area.The economic development of mountainous regions in China is classified into 4 main types and 23 subtypes.展开更多
基于CiteSpace计量分析软件,对景观安全格局相关文献进行了分析,探究了景观安全格局研究进展及发展趋势。所用数据来源于中国知网(CNKI)和Web of Science(WOS)核心数据集,分别在中国知网和WOS中以主题词为“景观安全格局”和“Landscape...基于CiteSpace计量分析软件,对景观安全格局相关文献进行了分析,探究了景观安全格局研究进展及发展趋势。所用数据来源于中国知网(CNKI)和Web of Science(WOS)核心数据集,分别在中国知网和WOS中以主题词为“景观安全格局”和“Landscape security pattern”进行高级检索。运用CiteSpace软件对相关文献的作者、机构、关键词进行了网络知识图谱制作并分析,结果表明:①景观安全格局研究总体上处于上升趋势,国内学者发文量高于国外学者,核心作者主要包括俞孔坚、李迪华、彭建等人;②国内主要研究机构包括北京大学、中国科学院、北京师范大学等。国外主要以Univ Sao Paulo和Princeton Univ两大机构为主;③景观安全格局的研究主要集中于格局的识别与方法构建上,对城市、流域、土地利用、生物多样性保护等进行大量应用研究,但在高山峡谷、黄土丘陵区的相关研究较少。展开更多
基于《义务教育英语课程标准(2011年版)》的能力要求,以人教版新目标初中《英语》八年级(下)Unit 3 Could you please clean your room?Section A 3a阅读文本的解读为例,探究英语阅读文本解读的三个着力h,即文体特征分析、主题意义挖掘...基于《义务教育英语课程标准(2011年版)》的能力要求,以人教版新目标初中《英语》八年级(下)Unit 3 Could you please clean your room?Section A 3a阅读文本的解读为例,探究英语阅读文本解读的三个着力h,即文体特征分析、主题意义挖掘和情感价值延伸。展开更多
文摘研究绿色同时取送货车辆调度问题,提出改进的遗传禁忌搜索算法(Genetic Algorithm with Tabu Search,GA-TS)求解该问题。模型中,以服务成本、油耗成本和碳排放成本构成的总成本最小为目标,采用了综合模型计算油耗和碳排放成本,引入三角模糊数来描述客户需求的不确定性,并考虑同时取送货需求。在改进的GA-TS算法中,将惩罚因子引入适应度函数,采用结合精英策略的选择算子,提出结合禁忌搜索算法的变异算子。在案例分析中,采用田口分析法获取合理的参数设置,通过案例结果分析和算法对比分析验证模型和算法的有效性和先进性。
基金supported by the National Natural Science Foundation of China(Grant No.41571523)the Key Program of the Chinese Academy of Sciences(Grant No.KZZDEW-06-03)+1 种基金the National Basic Research Program of China(Grant No.2013CBA01808)the National Key Technology R&D Program of China(Grant No.2014BAC05B01)
文摘China is a mountainous country with a great diversity of landform and geomorphology.This diversity underlines the need for regionalization and classification.This study defines the mountain terrains and regions with three criteria-elevation,relative height,and slope,and examines the extent of mountainous regions by using county as the basic administrative unit.According to the three parameters of economic base,resident income and development potential,we classified the economic development level in mountainous regions of China.The findings reveal that the extent of the mountainous region accounts for 74.9% of the China's Mainland's total area.The economic development of mountainous regions in China is classified into 4 main types and 23 subtypes.