CROSS‐DOCKING AND ITS IMPLICATIONS IN LOCATION‐DISTRIBUTION SYSTEMS

Cross‐docking replaces traditional warehousing, enabling continuous flow of items without storage. Here we model location‐distribution networks, that include cross‐docking facilities, to obtain the latter's impact on the supply chain. We formulate optimization models to minimize total cost in three multi‐echelon networks, each model generalizing the preceding one. The first includes a single manufacturer, one product type, and multiple customers. Cross‐docks are to be located between origin and destinations. Besides solving optimally, a tool for quantitative analysis of direct‐shipment decisions is developed. The second model considers more than one product: We determine a cost‐effective sequence of items for indirect shipment (via cross‐docks). Finally, in a network with multiple origins, optimal solutions are obtained for 40 medium‐sized and larger examples.     

采取网络型的政府市场供给模式应对房价问题

面对不断飙升的房价,从理论界到政策层面对其原因都有不同的解读,但从实践结果来看对房价的治理并不理想。本文在综合分析理论研究与国家调控政策的基础上,认为创新措施采取网络型的政府市场供给模式是解决房价过快上涨的有效途径。文章着重对这一模式进行了分析,并认为此举对缓解供需矛盾、解决市场的信息不对称、市场操控、改变预期、稳定房价等都有非常重要的作用。     

Multiple generation product life cycle predictions using a novel two-stage fuzzy piecewise regression analysis method

Product life cycle (PLC) prediction plays a crucial role in strategic planning and policy definition for high-technology products. Forecast methodologies which can predict PLCs accurately can help to achieve successful strategic decision-making, forecasting, and foresight activities in high-technology firms, research institutes, governments, and universities. Over the past few decades, even though analytic framework strategies have been proposed for production, marketing, R&D (research and development), and finance, aiming at each stage of PLCs, forecast methodologies with which to predict PLCs are few. The purpose of this research is to develop a novel forecast methodology to allow for predictions of product life time (PLT) and the annual shipment of products during the entire PLC of multiple generation products. A novel two-stage fuzzy piecewise regression analysis method is proposed in this paper. In the first stage, the product life-time of the specific generation to be analyzed will be predicted by the fuzzy piecewise regression line that is derived based upon the product life-time of earlier generations. In the second stage of the forecast methodology, the annual shipment of products of the specified generation will be predicted by deriving annual fuzzy regression lines for each generation, based upon the historical data on the earlier generations' products. An empirical study predicting the life-time and the annual shipment of the 16 Mb (Mega bit) DRAM (Dynamic Random Access Memory) PLC is illustrated to validate the analytical process. The results demonstrate that two-stage fuzzy piecewise regression analysis can predict multiple generation PLT and PLC precisely, thereby serving as a foundation for future strategic planning, policy definitions and foresights.     

Scaledt分布、杠杆效应和上证综指的VaR风险

与正态分布相比,上证指数收益率的经验分布具有尖峰厚尾特征,但用Scaled t-分布比正态分布可以更好地拟合上证指数收益率的经验分布。本文以Scaled t-分布假设下的GJR模型为基础,测量了上证指数收益率波动性的杠杆效应,即信息对波动性的不对称影响：并根据GJR模型应用Monte Carlo模拟方法,测定上证指数日收益率和持有期收益率的风险价值（VaR）。根据GJR模型提供的结果,上证指数30天、60天和90天持有期收益率的风险值分别为12．1％、17．8％、22．0％。用GJR模型比均值-方差模型和历史模拟方法计算的5％显著性水平VaR值更接近实际收益率。     

汇率冲击和行业就业调整

根据Campa和Goldberg的贸易结构理论,我们对国内15个行业就业和汇率间的关系进行了实证研究。结果发现大多数行业在汇率冲击后的反应和理论一致,即人民币升值会抑制其就业增长,而贬值有利于其就业扩张,尤其是对高开放度和劳动密集型行业影响显著。但由于其他行业就业汇率弹性并不显著,因此降低了整体就业汇率弹性的显著性。此外,由于我国各行业开放度高于美国,因此就业汇率弹性也较大。     

利率期限结构曲线的估计方法——基于上交所国债的实证分析

本文系统地论述了各种利率期限结构曲线估计方法的原理．提出了估计方法需满足的原则,并采用上海证券交易所的国债市场数据,比较了四种主要估计方法的拟合效果,提出了适合我国债券市场的利率期限结构估计方法。     

企业社会绩效评价的利益相关者模式

国内企业综合评价还停留在财务综合评价阶段，所以在评价的内容上编重于企业的经营绩效而忽视了企业社会绩效的评价。而20世纪70年代以来西方学者在利益相关者理论的基础上提出了多种评价企业社会绩效的利益相关者模式，试图更确切地评价企业的社会绩效。本文将总结借鉴国外较有代表性的两种企业社会绩效评价模式，并试图在此基础上探讨适合我国国情的企业社会绩效评价模式。     

中国人力资本水平与FDI技术溢出关系研究

针对1985-2009年间中国人力资本水平和FDI技术溢出进行VECM模型检验结果表明,我国人力资本水平与FDI技术溢出存在长期稳定关系,但短期关系不显著。从动态层面看,FDI技术溢出变化对我国人力资本水平有显著的正向影响,但我国人力资本水平变化对FDI技术溢出的正向影响程度较弱。     

乡村旅游区域合作发展模式研究——以环洪泽湖地区为例

目前国内乡村旅游业的发展尽管速度较快,农业观光园、农家乐、采摘节等乡村旅游形式在各地大量涌现,但是与发达国家相比仍处于起步阶段,各旅游目的地之间缺乏统一规划、资源特色不明显、配套服务设施缺乏、经营模式单一等问题突出。区域旅游合作对整合资源、统筹城乡发展、丰富区域旅游类型、满足都市居民对乡村旅游的需求,提升其综合发展水平是一条可行的途径。本文基于对乡村旅游发展现状的研究,提出了包括空间发展、运营模式、产品开发、策划营销及支持系统在内的区域旅游合作发展模式,以期对乡村旅游的发展有所裨益。     

自归理论与递归方法之数据质量辨识能力比较(英文)

分别应用自归理论和递归方法,采用同一组隧道拱部沉降实测数据进行对比分析证明,自归理论的数据质量辨识与数据筛选能力强于递归方法,宜于原始数据精度要求较高的、高等级项目监控的数据处理;而递归方法由于抗干扰性能强,在对参与数据质量没有较高要求时使用,亦不失为一种可行的措施。