多配送中心单向车辆调度问题的模型与禁忌搜索算法的研究

在对无时间窗和软时间窗多配送中心单向车辆调度问题进行直观描述的基础上,分别建立了相应问题的数学模型。提出了直接解决多配送中心单向车辆调度问题的禁忌搜索算法,设计了求解多配送中心单向车辆调度问题的算法流程,并对已经存在的实例进行了实验计算。     

基于改进遗传算法的成品油配送车辆调度问题研究

为有效解决成品油配送中的油罐车车辆调度问题,构造了多车型-多油品-多加油站的成品油配送车辆调度优化的数学模型,设计了改进遗传算法对所提出模型进行求解,并用具体算例验证了模型和算法的有效性.     

车辆路径问题:研究综述及展望

车辆路径问题是物流系统优化中的关键内容之一,是现代物流管理研究中的重要内容。文章梳理分析了车辆路径问题(VRP)的分类、模型及算法等,详细综述了多车型、多车场、时间窗车辆路径问题研究现状,指出联盟车辆调度问题、考虑车辆(供应)时间窗的车辆调度问题可能是VRP问题未来新的研究趋势。     

多资源点物资发送计算机车辆调度系统模型

为了解决从多资源点向多需求点发送物资中的运输调度问题,本文提出了一个基于模拟过程的计算机调度系统模型以辅助日常车辆及装卸设备调度决策。其中的模拟过程运用启发式规则分配各车辆的路线。通过该系统运行产生的调度安排可以有效地减少运输和操作费用,并提高设备利用效率,减少车辆的排队等待。     

基于局部搜索遗传算法的仓库车辆调度优化研究

针对仓库装卸搬运系统实际运行时设备资源冲突和搬运车辆任务分配问题,建立了具有多个复杂约束条件的车辆调度优化问题数学模型.提出了一种求解仓库车辆调度优化问题的局部搜索遗传算法,解决了局部搜索中寻找高效邻域结构的技术难题,并用实例进行了验证.     

基于局部搜索遗传算法的仓库车辆调度优化研究

针对仓库装卸搬运系统实际运行时设备资源冲突和搬运车辆任务分配问题,建立了具有多个复杂约束条件的车辆调度优化问题数学模型。提出了一种求解仓库车辆调度优化问题的局部搜索遗传算法,解决了局部搜索中寻找高效邻域结构的技术难题,并用实例进行了验证。     

基于匈牙利算法的多车型配送问题

多车型车辆调度是一类高难度的运输决策工作,在编制合理的车辆使用方案过程中,要求以最低的费用完成运输工作量,实现经济效益最大化。不同种类的货物要求不同的运输车辆,通过对车辆需求特性及车辆参数的分析,建立了以最小总油耗量为目标函数的车辆调度模型,选用匈牙利算法对该模型求解,经过实际计算验证,结果切实可行。     

基于匈牙利算法的多车型配送问题

多车型车辆调度是一类高难度的运输决策工作,在编制合理的车辆使用方案过程中,要求以最低的费用完成运输工作量,实现经济效益最大化.不同种类的货物要求不同的运输车辆,通过对车辆需求特性及车辆参数的分析,建立了以最小总油耗量为目标函数的车辆调度模型,选用匈牙利算法对该模型求解,经过实际计算验证,结果切实可行.     

物流配送车辆调度路径优化问题算法研究

近年来,我国物流运行总体平稳,物流需求规模保持较高增幅,物流业增加值平稳增长,但经济运行中的物流成本与其他发达国家相比依然较高。车辆调度配送路径优化问题同时涉及能源消耗和废物的排放问题,随着人们对环境问题给予越来越多的关注,因而其一直是国内外研究的热点。同时物流配送车辆调度问题在企业运营中起着重要的作用。文章首先简介了车辆调度问题,然后从研究的精确算法和启发式算法两方面较为详细地论述了国内外有关车辆调度问题的研究现状,总结了研究中存在的问题,并对物流算法的发展进行了展望。     

基于免疫粒子群优化算法的物流配送车辆调度算法

将物流企业的车辆调度问题建模为一个单目标多约束的优化问题,将免疫原理与粒子群优化算法相结合,提出了一个车辆调度的免疫粒子群算法。该算法能在群体进化时注入满足约束的疫苗,从而加快种群寻优的效率,得到质量更高的解。实验结果显示:相比传统的遗传算法和粒子群算法,该方法能够得到更加满意的车辆调度结果。     

中国行业报营销策略研究

文中立足中国行业报现状,存在的问题及原因,提出中国行业报营销策略的研究.通过中国行业报理论的四要素阐述.根据现代市场营销理论的研究成果.把商品和服务整体地销售给消费者的一系列经营管理活动,展现了行业报面临的形势和挑战.文中针对行业报面临的形势、挑战和现状,提出了行业报的发展趋势及主要对策.     

武汉光电子产业标准与专利现状及推进策略研究

在全球市场竞争中,技术标准已成为企业抢占国际分工的关键环节及重要手段。在信息产业领域,专利借助技术标准这一载体与平台,逐渐成为国际贸易的游戏规则及非关税壁垒,谁控制了专利,谁就可以控制国际市场和国际贸易,技术标准与专利的结合是发展的必然趋势。文章在调研的基础上,对武汉光电子产业的的标准与专利现状进行了分析,并结合实际问题,站在企业的视角,对企业最为关注的专利进入标准的问题,提出了在实际操作过程中应注意的一些问题及对策建议。     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.     

国内门户网站品牌塑造及模型构建——基于国内外门户网站的比较研究

互联网是全球化的虚拟化,虚拟体验直接影响顾客的认知与行为,从而影响网站的品牌。基于受众体验的国内门户网站品牌塑造模型的构建,是国内门户网站在参考国外先进的网站建设的成功经验的基础上,塑造适合国内门户网站的品牌策略和一项重要的竞争策略。     

中世纪的骑士精神及其衰落

在学习西欧中世纪骑士制度过程中,了解到了骑士制度在中世纪历史上所占据的历史地位。骑士制度被誉为"封建制度之花",是社会中坚力量,骑士精神对国王到最低等贵族的统治阶级产生了巨大影响。庄园经济的衰落使骑士制度逐步瓦解;战争的平民化和雇佣军的盛行使骑士队伍萎缩;基督教的腐朽弱化了"骑士精神";不适应军事和战争变革的需要,几个方面解释在政治和社会上拥有如此高地位的骑士阶层从繁荣到衰落的原因。     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

The clash of managerial and professional logics in public procurement: Implications for innovation in the health-care sector

This article addresses the enactment of public procurement and its influence on adoption and diffusion of innovation, using a case study of public procurement of a low-tech medical device innovation in Swedish healthcare. Based on interviews and documentation, the article illustrates the various perspectives of the different professions involved in the complex task of setting the requirement specification for the tender. The technology identities of the medical device (innovation) are constructed and negotiated by the actors: procurement administrators, health-care professionals and suppliers within the adoption space. Examining the enactment of the procurement process as part of the adoption space is a way to deepen our understanding of the social component within public procurement.     

浅谈纺织面料特性与服装设计的关系

面料、款式、色彩是构成服装的三要素.而每一次掀起服装改革浪潮的都是面料.文中阐述了面料与服装的搭配.要抓住面料的特点,与设计的服装款式相结合,借助面料的特点,突出设计主题.表现服装风格.     

科技是绿色建筑发展的基础

近年来,全球气候恶化,温室气体效应危害了全人类的生存环境。随着我国城市化进程的加速,相应的建筑物和设施将大幅增加,建筑能耗随之加大。一种能节约能源及资源、减轻环境负荷的绿色建筑应运而生,成为我国建设小康社会的必由之路。文章认为,日新月异的科技进步必然是绿色建筑发展的坚实基础和唯一途径。     

The Geography of Innovation in China and India

The BRICS countries in general, and China and India in particular, are now widely regarded as the areas of the world likely to challenge the economic leadership of the United States (US) and the European Union (EU). A large part of this challenge will come from rapid technological catch‐up by China and India. Yet, despite a recent rise in interest, there is limited knowledge about how and where innovation takes place in these two leading emerging countries and to what extent the Chinese and Indian territorial systems of innovation differ from those in the EU or the US. In this article we explore the geography of innovation in China and India, concentrating on understanding key territorial‐level innovation trends by country, region and technology field, using the US and the EU as benchmarks. We find significant contrasts between the geography of innovation in China and India and that of the US and the EU. First, the degree of concentration of innovative activities in both countries is extremely high. Levels of agglomeration of innovation in the coastal provinces of China, as well as in Delhi and the South of India, significantly exceed the levels of agglomeration found in the USA and the EU. Secondly, China has witnessed a more rapid increase in the degree of concentration of innovation than India. We posit that the differences in the geography of innovation between, on the one hand, China and India and, on the other hand, between these countries and the developed world are rooted in different institutional settings, different systems of innovation and different national innovation strategies.