基于FAHP-CRITIC和VIKOR法的PC构件供应商评价选择方法

选择优质合适的PC构件供应商是装配式建筑项目顺利开展的关键。针对PC构件供应商的评价选择问题,提出一种基于FAHP-CRITIC和VIKOR法的评价选择方法。基于包括性能、价格、供货、企业发展及合作5个方面的构件供应商评价指标体系,采用FAHP与CRITIC法分别确定了各评价指标的主、客观权重,采用基于理想点法的组合权重赋权法确定其组合权重;基于此,采用VIKOR法计算出待选供应商的综合评价值并进行优劣排序;最后,通过算例验证了本选择决策方法的实用性与科学性。研究成果可为PC构件采购商提供科学的选择方法,同时也可为PC构件的供应商进一步提升竞争力提供参考。     

Tourism demand patterns in turbulent times: analysing Welsh accommodation occupancy data for 1998–2001

Different events in 2001, most notably an outbreak of foot and mouth disease and the 11 September terrorist attacks in the USA, caused many tourist businesses in the UK to experience significant changes in demand volumes. This paper examines the occupancy performance of serviced accommodation establishments in Wales from 1998 to 2001 and focuses especially on the changes in demand patterns in 2001. The approach is based on a combination of principal components and cluster analysis. The results are used to group establishments with similar performance profiles. Detailed conclusions are drawn about the temporal and spatial shifts in demand in 2001. ‘Winners’ and ‘losers’ are identified and several concrete implications for marketing and development policies are discussed. Copyright © 2004 John Wiley & Sons, Ltd.     

振动压路机常用液压回路分析及其应用

振动压路机的行驶、振动、转向3大系统普遍采用液压传动技术,它能保证振动压路机碾压和驱动轮的控制精度,稳定振动机行驶的作业速度,实现自动调频调幅和平稳振动,提高压实质量,文中对振动压路机的3大液压系统回路作了较详细的分析。     

An alternative definition of individual bioequivalence

Several definitions of individual bioequivalence of two formulations of a medical treatment (drug) have been proposed recently. These definitions attempt to adapt the criterion of average bioequivalence, which would be deficient if substantive treatment heterogeneity were present. In some of the proposed definitions, relatively large differences of means can be compensated by differences in the measurement-error variances. We propose a definition based on a simple latent-variable model which overcomes this anomaly and need not involve the U.S. Food and Drug Administration's 80/125 rule. Our approach is based on a moment-matching estimator of the discrepancy between the outcomes underlying the subjects' responses. The distribution of this estimator is a linear combination of independent χ² variates; asymptotically, it can be approximated by a normal distribution. Evidence of individual bioequivalence corresponds to rejecting the hypothesis that the discrepancy is greater than a specified threshold. The approach is illustrated by reanalysing two bioequivalence trials.     

Is it one break or ongoing permanent shocks that explains U.S. real GDP?

The relative importance of permanent versus cyclical shocks to GDP has been found to depend on the presence or absence of a single break in mean growth. We estimate unobserved components models conditional on a trend break having occurred in any specified quarter and use the Bayesian model averaging to combine the conditional estimates. We estimate a break occurred around 2006:1. Allowing for a break significantly reduces estimates of trend variance. However, enough spread remains in the posterior distribution to indicate that available data does not definitively settle the question of the relative importance of trend versus cycle.     

主成分分析方法在区域经济统计分析中的应用

根据主成分分析的原理和方法，利用SPSS社会统计软件分析得出，2003-2007年孝感市经济发展总体势头是良好的，但也存在一些问题。首先，经济总量不大且增长速度缓慢，需要因势利导，大力调整产业结构；其次，投资增长速度不快，需要依托武汉经济圈的优势加大招商引资的力度；最后，工业基础薄弱，发展缓慢，需要制定政策，引进人才，改进技术。     

贸易条件变动影响因素的主成分分析——以浙江省为例

文章采用多元统计中的主成分分析方法,以浙江省为例,对影响贸易条件变动的因素进行了实证分析。研究结果表明,名义汇率对收入贸易条件有显著影响,经济发展水平、国内市场规模、基础设施建设投入和人民生活水平的提高对促进收入贸易条件的改善起到了积极作用,而外商投资、研发投入对收入贸易条件影响较小。为此,文章提出了相应的政策建议。     

基于SAC型电液控制系统的测试用例综述

测试用例的设计和编制是软件质量稳定的根本保障,完善测试平台,规范测试步骤,具有完整的测试大纲及用例集,对测试的完整性有重要的意义。本文主要对基于SAC型电液控制系统的测试用例集的构建方法和测试内容展开研究,介绍了SAC型电液控制系统的组成及系统可以实现的功能,主要阐述了基于此系统的测试平台的搭建、测试流程中的主要步骤并举例说明以及系统安全性测试方法。     

Non-linear exchange rate relationships: An automated model selection approach with indicator saturation

This paper examines whether the explanatory power of exchange rate models can be improved by allowing for cross-country asymmetries and non-linear effects of fundamentals. Both appear to be crucial. The samples include the USD versus pound and yen from 1982:10 to 2013:10, and automated model selection is conducted with indicator saturation. Several non-linear effects are significant at 1%. Further, many of the indicators present in the linear models are eliminated once allowing for non-linearities; suggesting some of the structural breaks found in previous work were an artifact of the misspecified linear functional form. These conclusions are robust to estimation using principal components.     

物流绩效评价方法比较

本文主要研究了物流绩效评价中的两种方法:主成分分析法和模糊评价法。通过具体的分析对两种方法做了比较,同时提出了四点物流绩效的改进建议。