水利工程质量链本构关系建立与模糊评价

我国建设事业不断蓬勃发展,建设项目规模也越来越大,质量问题越来越成为焦点问题,本文在对水利工程建设的基本建设程序的分析与研究的基础上,建立了以质量链思想为核心的工程质量链本构关系,并应用模糊综合评判法对某渡槽主体工程进行评价,以期以质量链的思想对水利工程进行系统的、动态的质量评价与控制提供依据。     

基于工程建设三类因素内部关系的工程目标评价研究

工程建设的目标可分为质量、进度及资源投入目标,从工程建设全生命周期来看,三大目标之间相互制约、相互影响,总体关系可归纳为统一性（替代关系）与制约性（平衡关系）。这两大关系的不同影响导致总体目标发生变化,初始目标与最终目标之间的演化博弈过程可以用马尔可夫转移矩阵来表示。文章将最终的演化稳定策略细分为6类。马尔可夫矩阵体现了工程建设中的中期控制的动态变化过程,对目前工程建设中广泛推广Turnkey模式缺乏中期控制是个有益的补充。     

Simple averaging of direct and recursive forecasts via partial pooling using machine learning

This article introduces the winning method at the M5 Accuracy competition. The presented method takes a simple manner of averaging the results of multiple base forecasting models that have been constructed via partial pooling of multi-level data. All base forecasting models of adopting direct or recursive multi-step forecasting methods are trained by the machine learning technique, LightGBM, from three different levels of data pools. At the competition, the simple averaging of the multiple direct and recursive forecasting models, called DRFAM, obtained the complementary effects between direct and recursive multi-step forecasting of the multi-level product sales to improve the accuracy and the robustness.     

动态能力关系质量与合作绩效实证研究

本文以上市制造企业为调查对象,对动态能力、关系质量、合作绩效之间关系进行了研究。研究结果表明,动态能力对关系质量有着显著的正向影响;动态能力对合作绩效有着显著的正向影响;关系质量对合作绩效有着显著的正向影响;动态能力不仅直接影响到合作绩效,而且通过关系质量间接地影响到合作绩效。本文研究结论可为我国制造企业制定和实施管理策略提供理论指导。     

城乡交互作用相关理论研究进展及其启示

全面综述了关于城乡交互作用的研究文献。文章从城乡界定入手,继而分析了发展模式对城乡关系的影响以及处理城乡关系的空间发展战略,最后详尽分析了城乡之间人口、商品、废弃物以及部门等多维联系。     

Discounting long run average growth in stochastic dynamic programs

Summary. Finding solutions to the Bellman equation often relies on restrictive boundedness assumptions. In this paper we develop a method of proof that allows to dispense with the assumption that returns are bounded from above. In applications our assumptions only imply that long run average (expected) growth is sufficiently discounted, in sharp contrast with classical assumptions either absolutely bounding growth or bounding each period (instead of long run) maximum (instead of average) growth. We discuss our work in relation to the literature and provide several examples. Received: July 26, 2000; revised version: July 10, 2002 RID="*" ID="*" I am specially grateful to Cuong Le Van and to anonymous referee for detecting an error in a previous version of this paper and for suggestions that sensibly improved the paper. Comments and suggestions are also acknowledged to Michele Boldrin, Raouf Boucekkine, Fabrice Collard, Tim Kehoe, Omar Licandro, and Luis Puch. I am also indebted to participants to the III Summer School on Economic Theory held at the Universidade de Vigo, the Macroeconomics Workshop at the Universitat Autò}noma de Barcelona, and the Econometrics Seminar at Tilburg University. Financial support from the Belgian government, under project PAI P4/01, at the IRES-UCL, from a European Marie Curie fellowship, Grant HPMF-CT-1999-00410, at the CEPREMAP, and from IVIE and Spanish Ministerio de Ciencia y Tecnología and FEDER, under project BEC2001-0535, at the Universidad de Alicante, is gratefully acknowledged.     

语义单位关系理论及其作用

Hoey将语义单位关系定为人们根据相邻句子或句群选择语法、词汇和语调来生成句子或句群的认识过 程,并将它分为两大类:逻辑顺序关系和匹配关系。而实现这些关系最常见的途径是标识手段,最基本的语篇模式为 问题解决模式,匹配模式和一般具体模式。     

改善国有企业的委托-代理链条

产权不清、企业法人治理结构不合理以及没有完善的激励约束机制 ,导致了国有企业委托 -代理关系的低效。要完善国有企业的委托 -代理链条 ,必须明晰产权 ,增强国有资产代理人选派的公正性 ,强化代理人激励和约束机制 ,并完善资本市场和法律制度。     

浅论广告设计中的公关运用

随着公关活动在广告传播中的盛行,整合出具有广告和公关各项优势的公关广告不仅在品牌塑造上发挥作用。为了经营这些关系,企业必须有意识地将自己各种营销工具整合起来,用心营造沟通的世界。在产品推广、危机管理中,也发挥着极大的作用。公关广告用心营造沟通的世界,推动社会的经济发展促进物质文明的进步。     

沥青混合料高温稳定性的灰色关联分析

灰色关联分析是一种系统分析方法。运用灰色关联分析可以分辨出各个影响因素与系统的发展态势之间的紧密关系,从中找出对系统起到推动性作用的主要因素,哪些会是对系统的发展起到很小影响力的次要因素。本文运用灰色关联熵分析法对沥青混合料的高温性能进行分析。