价值工程在工程施工组织设计中的应用

在工程施工组织设计中应用价值工程(VE)进行方案选择与优化,可以达到了降低工程成本,保证工程质量和进度的目的。     

Pricing of Forward and Futures Contracts

There has long been substantial interest in understanding the relative pricing of forward and futures contracts. This has led to the development of two standard theories of forward and futures pricing, namely, the Cost-of-Carry and the Risk Premium (or Unbiased Expectations) hypotheses. These studies have modelled the relationship between spot and forward/futures prices either through a no-arbitrage condition or a general equilibrium setting. Relatively few studies in this area have considered the impact of stochastic trends in the data. With the emergence of non-stationarity and cointegration in recent years, more sophisticated models of futures/forward prices have been specified. This paper surveys the significant contributions made to the literature on the pricing of forward/futures contracts, and examines recent empirical studies pertaining to the estimation and testing of univariate and systems models of futures pricing.     

On Families of Distributions with Shape Parameters

Univariate continuous distributions are one of the fundamental components on which statistical modelling, ancient and modern, frequentist and Bayesian, multi‐dimensional and complex, is based. In this article, I review and compare some of the main general techniques for providing families of typically unimodal distributions on with one or two, or possibly even three, shape parameters, controlling skewness and/or tailweight, in addition to their all‐important location and scale parameters. One important and useful family is comprised of the ‘skew‐symmetric’ distributions brought to prominence by Azzalini. As these are covered in considerable detail elsewhere in the literature, I focus more on their complements and competitors. Principal among these are distributions formed by transforming random variables, by what I call ‘transformation of scale’—including two‐piece distributions—and by probability integral transformation of non‐uniform random variables. I also treat briefly the issues of multi‐variate extension, of distributions on subsets of and of distributions on the circle. The review and comparison is not comprehensive, necessarily being selective and therefore somewhat personal. © 2014 The Authors. International Statistical Review © 2014 International Statistical Institute     

Do investors value companies' mandatory nonfinancial risk disclosure? An empirical analysis of the Italian context after the EU Directive

In October 2014, the European Union adopted Directive 2014/95/EU (hereafter, EU Directive), mandating companies of a certain size to draft and publish corporate nonfinancial information (NFI) regarding society and the environment. In this study, we examine the mandatory disclosure of nonfinancial (NF) risks by listed Italian companies, as required by the EU Directive, focusing on both the state‐of‐the‐art of such disclosure and its usefulness for investors. For this purpose, the study adopts a two‐staged research approach; in the first stage, we employed a manual meaning‐oriented content analysis to investigate the NF declarations (NFDs) of the listed Italian companies that were obliged to disclose NFI, returning a quality NF risks disclosure index. In the second stage, we used the value relevance methodology to investigate whether the disclosed NF risk information affects the levels of equity prices, through a modified Ohlson model. Our research is one of the first to investigate the value relevance of mandatory disclosures of NF risks following the implementation of the EU Directive, in the Italian context. The research was carried out in 2017, the first year of the directive's application for listed Italian companies. The main findings support a positive association between NF risk information disclosure levels and companies' market value. Moreover, they provide evidence of a significant mediating effect of NF risk on the relationship between financial risks and market value.