应用电法新装置勘探二维与三维地电体

本文通过对新装置条件下位场特征的分析,应用边界单元法及解析法的计算结果,发现当二维或三维电性不均匀体与测量电极位于背景场同一等位面时,视电阻率异常反映最明显。从而提出了圆弧交会法确定二维或三维地电体中心理深的方法,并给出了若干计算实例。结果表明,此方法简便有效且精度较高。     

中国股票市场市盈率的检验分析

市盈率高低是我国股市的关注焦点之一。本文在比较国外证券市场的市盈率之后认为我国的市盈率偏高。这种推测得到我们理论研究和模型结论的支持,我国股市市盈率由于系统风险的掩藏、股票初始发行价偏高和股市投机性等因素而呈现较高的倍数。从2004年我国股市市盈率开始下降,逐渐接近我们模型的估计值。此外,我们实证分析认为,市盈率的高低与GDP增长、股票收益波动和国有股比重等因素不存在严格的变动关系,市盈率呈现出一种随机游走的态势,市盈率不是稳定的区间值,而是一系列的动态的时间序列变量值。     

物流管理信息系统体系结构的分析设计

对企业内部物流管理信息系统的应用体系结构特点进行了分析和研究,剖析了J2EE标准架构的特点与优点。在此基础上,给出了基于J2EE的物流信息系统的总体设计理念。     

B2C电子商务模式下的物流配送研究

物流配送是电子商务运作的一个重要环节,在整个商务活动中起着举足轻重的作用.目前,在线交易中的信息流已通过互联网基本实现,资金流的安全也在一定程度上得到了解决,但物流仍是电子商务开展的一大瓶颈.B2C作为电子商务的运作模式之一,存在着配送不及时、配送成本高、无法送货等问题.不解决物流配送的问题,B2C模式就难以快速发展.本文针对B2C模式的特点和对物流配送的要求,提出了B2C电子商务模式下建立物流配送系统的解决思路。     

Assessing French nursing home efficiency: An indirect approach via budget-constrained DEA models

In this paper, data envelopment analysis (DEA) techniques are applied to the French nursing home industry in order to address two policy issues. The first involves nursing home size and returns to scale, while the second deals with the potential effects of a change in nursing home reimbursement from a flat rate to one based on the severity of case-mix. To accomplish this, our analysis expands on the existing nursing home literature to analyze technical and allocative efficiency along with budget-constrained models rather than the more common direct input-based distance function. Technical efficiency is evaluated via an indirect output distance function while allocative output efficiency is computed with a cost indirect revenue function. The findings suggest that system-wide efficiency and equity may result from coming reforms since payments would more accurately reflect resource use.     

Model selection in random effects models for directed graphs using approximated Bayes factors

With the development of an MCMC algorithm, Bayesian model selection for the p ₂ model for directed graphs has become possible. This paper presents an empirical exploration in using approximate Bayes factors for model selection. For a social network of Dutch secondary school pupils from different ethnic backgrounds it is investigated whether pupils report that they receive more emotional support from within their own ethnic group. Approximated Bayes factors seem to work, but considerable margins of error have to be reckoned with.     

可转换债券市场价格与其基准股票市盈率关系初探

本文试图探讨可转换债券市场价格与其基准股票市盈率间的关系。从理论上分析,市盈率作为一个较易获得的市场指标,包含了上市公司增长机会(growth opportunity)的信息,反映了投资者对未来股价上升的预期。同时可转换债券的价格对其基准股票价格未来上升的可能性十分敏感,因此市盈率与可转换债券市场价格间应存在一定关系。但根据对上海证券交易所转债的实证分析得到:目前我国转债的市场价格与其基准股票市盈率间的关系并不显著,因而市盈率指标不能作为判断转债投资价值的有效依据。     

面向3PL的物流信息系统的实现

以第三方物流企业的实际需求为例,给出了适合该第三方物流企业商业运作流程的物流信息系统整体解决方案,包括基于J2EE系统技术架构、系统功能、网络体系结构、系统接口等.该解决方案适用于目前大多数的第三方物流企业.     

R＆D项目影响因素的筛选及优化分析

影响R&D项目成败的因素是多种多样的,来自于方方面面。在实证调研的基础上建立了影响因素初选集,之后针对不同类型的因素,分别运用字2检验、T检验及因子分析的方法对初始因素集进行优化,为项目的评价工作建立更为科学、有效的指标体系。     

IMF concern for reputation and conditional lending failure: Theory and empirics

In this paper we suggest that the dual role played by the IMF, as a creditor and as a monitor of economic reforms, might explain the lack of credibility of the Fund threat of sanctioning non-compliance with conditionality. Specifically, we show that the IMF's desire to preserve its reputation as a good monitor may distort its lending decisions towards some laxity. Moreover, such distortionary incentives may be exacerbated by the length of the relationship between a country and the Fund. Estimating a dynamic panel of 53 middle-income countries, for the period 1982–2001, we find that a longer relationship does increase IMF disbursements.