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考虑港口忙闲时间窗约束的多式联运路径优化 被引量:4
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作者 郑红星 邵思杨 吴云强 《高技术通讯》 EI CAS 北大核心 2020年第1期82-90,共9页
随着海运贸易量的持续增长,以港口为核心枢纽的多式联运引起了多方关注。为追求多式联运整体效益,立足承运商角度,研究集港模式下集装箱多式联运的路径优化问题,基于港口忙闲时间段考虑忙闲时间窗约束,兼顾中转节点的周期性时间窗以及... 随着海运贸易量的持续增长,以港口为核心枢纽的多式联运引起了多方关注。为追求多式联运整体效益,立足承运商角度,研究集港模式下集装箱多式联运的路径优化问题,基于港口忙闲时间段考虑忙闲时间窗约束,兼顾中转节点的周期性时间窗以及各运输方式的班期限制,构建以总运输成本最小为目标的路径优化模型,并设计改进遗传算法(IGA)对模型求解。结果表明,与不考虑港口忙闲时间段相比,考虑该因素可令集港货物有效错开港口业务繁忙期,进而避免过高的预集港费和晚集港费;同时,忙碌时间窗越接近截港时刻,空闲时间窗之间的间隔越长,对承运商的影响越大,因此考虑港口忙闲时间窗的运输方案更为合理。 展开更多
关键词 闲时间 班期限制 多式联运 路径优化 改进遗传算法(IGA)
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基于统计分析优化的预测外呼算法 被引量:1
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作者 马丽 宋建斌 詹舒波 《计算机应用》 CSCD 北大核心 2017年第A01期352-355,共4页
随着呼叫中心系统呼出业务量的不断增多,如何减少坐席等待时长、提高外呼效率已成为外拨型呼叫中心的研究重点。呼叫中心中现有外呼算法平均置闲时长分布不稳定和呼损较高。提出基于统计分析优化的预测外呼算法,根据通话时长的统计分布... 随着呼叫中心系统呼出业务量的不断增多,如何减少坐席等待时长、提高外呼效率已成为外拨型呼叫中心的研究重点。呼叫中心中现有外呼算法平均置闲时长分布不稳定和呼损较高。提出基于统计分析优化的预测外呼算法,根据通话时长的统计分布得到通话结束个数的数学期望,计算不同通话结束的概率,及时调整外呼速度。优化后的预测外呼算法,平均置闲时长的分布更加稳定,呼损率有效降低,基本控制在2%以内;只依据平均振铃时长,增强了算法调节的可靠性。 展开更多
关键词 呼叫中心 预测外呼 统计分析 呼损 闲时间
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浅论对农报道的舆论引导
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作者 杨黎明 《东南传播》 2007年第3期111-112,共2页
中央电视台的受众调查显示,78.9%的农民在农闲时节主要依靠看电视来消遣农闲时间,农村人每天看电视的时间平均达到166分钟,比城市人多46分钟。由此不难看出:电视是农民接受信息的主要媒体。
关键词 看电视 中央电视台 时间平均 调查显示 闲时间 城市人 农民 农村
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CE认证之ETSI 301893-Adaptivity
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作者 范送艳 李贤青 徐凯 《数字通信世界》 2017年第12期50-51,共2页
自适应性测试使用的干扰信号可以由一个矢量信号发生器生成。如果测试信号需要覆盖多个20MHz的信道,则需要采用相应宽带宽的干扰信号进行干扰测试,或者采用多次测试来覆盖这相邻的多个20MHz的信道。
关键词 自适应性 闲时间 信道占用时间 短控制帧
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Residents′Activity-travel Behavior Variation by Communities in Beijing,China 被引量:15
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作者 ZHAO Ying CHAI Yanwei 《Chinese Geographical Science》 SCIE CSCD 2013年第4期492-505,共14页
China's transition from a planned economy to a market economy has resulted in many changes in its urban structure and society and provided an opportunity for a quasi-longitudinal case study on the relationship bet... China's transition from a planned economy to a market economy has resulted in many changes in its urban structure and society and provided an opportunity for a quasi-longitudinal case study on the relationship between the built environment and activity-travel behavior.This paper draws upon data from an activity diary survey conducted in Beijing in 2007.The survey sample comprised 652 residents living in Danwei(work unit),commodity housing,and affordable housing neighborhoods.On the basis of the three-dimensional geo-visualization analysis of the space-time path and statistical multivariate regression models of daily travel and leisure time,it was found that both residential spatial factors and socio-demographics influence residents' daily behaviors.The findings show that Danwei residents have less daily travel time than those who live in commodity housing,but people living in affordable housing endure the longest travel time.Daily leisure time is associated more with individual attributes.We argue that although China's transition is currently gradual,the Danwei system may continue to play significant roles in daily life,and it might provide a valuable model for neighborhood spatial planning. 展开更多
关键词 built environment activity-travel behavior Danwei(work unit) housing reform BEIJING
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Exercise is recreation not medicine
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作者 Andy Smith 《Journal of Sport and Health Science》 SCIE 2016年第2期129-134,共6页
Purpose: This paper responds to the question, is exercise medicine? It does so using a qualitative case study that proposes that exercise is recreation. The study (1) describes and reflects upon an exercise is rec... Purpose: This paper responds to the question, is exercise medicine? It does so using a qualitative case study that proposes that exercise is recreation. The study (1) describes and reflects upon an exercise is recreation metaphor, (2) establishes the principles and processes used to develop a sport park within which exercise is recreation, and (3) presents a comparative analysis of the exercise is recreation approach with a UK quality framework for "exercise referrals". Methods: Four years of documentation were collated and placed into 14 categories: (1) university strategies, (2) plans of the site, (3) policy documents, (4) minutes of a steering group, (5) contemporary documents, (6) organisational charts, (7) responses to local government policies on sport, (8) consultation documents, (9) operational procedures, (10) facility specifications, (11) partnership agreements, (12) material relating to the university's work on events, (13) notes on the universities sport department, and (14) timetables. These data were analysed through a 4-stage process which used recreation as the analytical theme for a comparative analysis. Results: The characteristics of the exercise is recreation metaphor in this case are (1) a focus on the experience of the user, (2) the promotion of well-being, (3) the importance of community, (4) embracing inclusivity, (5) sport, (6) aesthetics, and (7) leisure time. The principles and processes used to develop the sport park were (1) custodianship, (2) partnerships, (3) values, (4) inter-professional working, (5) local heritage, (6) change, (7) the natural park environment, and (8) "riding the bike as you build it". The comparative analysis with a UK quality framework for "exercise referrals" clearly shows a difference from an exercise is recreation approach. Conclusion: Exercise is recreation and may enable individuals and communities to reach a state of well-being. ~ 2016 Production and hosting by Elsevier B.V. on behalf of Shanghai University of Sport. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). 展开更多
关键词 Case study EXERCISE MEDICINE RECREATION
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培养时间观念,从日常生活开始
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作者 张萌 《幼儿教育(父母孩子)》 2020年第4期15-17,共3页
家长不妨在□常生活中有意识地对孩子进行时间,教育,在学前阶段逐渐帮助孩子培养时间观念,引导孩子认识时间的价值,提升时间管理能力,帮助他们成为一个善子安排和利闲时间的人,这对孩子的成长具有重大的意义。
关键词 时间管理能力 学前阶段 引导孩子 日常生活 闲时间 观念 培养
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