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无备选站址条件下的客运站自动选址是线站协同优化的前提和基础,而不局限于车站选址的代价最小化,同时考虑连接车站间区间线路的代价具有重要意义。构建复杂山区铁路客运站自动选址模型,首先,建立综合地理信息模型,基于线站一体化的设计理念,实现单个车站选址,确定站心位置及站坪方向;其次,以公路线形优化模型的改进算法完成站—站间自动选线设计;最后,将车站选址代价与区间线路代价紧密结合起来,计算综合代价,实现站址方案的优选。以山区铁路为例对该方法进行验证,结果表明,该方法能高效生成山区铁路车站方案集,并辅助设计人员进行方案优化。 相似文献
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We apply Bayesian methods to study a common vector autoregression (VAR)-based approach for decomposing the variance of excess stock returns into components reflecting news about future excess stock returns, future real interest rates, and future dividends. We develop a new prior elicitation strategy, which involves expressing beliefs about the components of the variance decomposition. Previous Bayesian work elicited priors from the difficult-to-interpret parameters of the VAR. With a commonly used data set, we find that the posterior standard deviations for the variance decomposition based on these previously used priors, including “non-informative” limiting cases, are much larger than classical standard errors based on asymptotic approximations. Therefore, the non-informative researcher remains relatively uninformed about the variance decomposition after observing the data. We show the large posterior standard deviations arise because the “non-informative” prior is implicitly very informative in a highly undesirable way. However, reasonably informative priors using our elicitation method allow for much more precise inference about components of the variance decomposition. 相似文献
4.
立足政府需要,从侧面对当前政府职能转变过程进行分析和探讨,希望以政府本身作为理性实体的运作为基础,对该问题进行解释。 相似文献
5.
高等教育成本负担理论提出虽然只有几十年,但是它已经被世界大多数国家所认可。此理论倡导的是谁受益谁付费的公平理念。但是它是否真的公平?本文从学费增幅和居民可支配收入的增幅、城乡居民高等教育负担、各阶层受教育情况等方面探讨我国高等教育成本负担情况,得出了我国的高等教育成本负担是不公平的结论,并提出了改进之策。 相似文献
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随着市场竞争的日趋激烈,培育高品质的顾客忠诚逐渐受到理论界和企业界的广泛重视。本文通过对服务企业顾客忠诚的影响因素展开讨论,提出一些服务企业培育顾客忠诚的营销路径。 相似文献
7.
G. H. BURROWS 《Abacus》1994,30(1):50-64
The extent to which allocated common costs should influence business decisions remains controversial in management accounting. In the finance and investment literature this issue is generally ignored or dismissed by appeals to the'incremental' principle. This article presents an historical analysis of allocations in long-run investing and pricing decisions. It is demonstrated that seminal figures in the development of both investment and price theory were conscious of the need for firms to cover common costs and generally favoured some form of allocation. The anti-allocationist position is shown to be of relatively recent origin and to have caused an inconsistency in the management accounting literature in the treatment of common costs. European costing theory is shown to have been consistently allocationist. Evidence of a return in the recent U.S. literature to the older Anglo-American, and continuing European, allocations tradition is presented. 相似文献
8.
The paper examines how hospital cost efficiency has reacted to extensive horizontal integrations of hospitals and rapid growth of managed care in the US health care industry. Cost efficiency is estimated by using panel data approaches to relax the assumptions for the hospital effects imposed in earlier studies. The paper shows that higher managed care penetration over time is associated with greater hospital efficiency, and higher market concentration is positively associated with efficiency when markets are highly competitive or highly concentrated. 相似文献
9.
本文通过对萍乡市排上生猪养殖协会的案例研究,揭示了农民协会在农业产业化经营中的重要作用:一方面发挥了协会统一经营的功能,为分散的农户提供资金、技术和市场等方面的帮助;另一方面又可以有效地调动农户分散经营的积极性,促进农户生产规模的不断壮大。本文对这种模式进行了分析,得出结论:农民协会统分结合经营模式的成功在于借助于组织实现了农户对生产费用和交易费用的节约。 相似文献
10.
Using generalized impulse response functions, this study tests for the trade J‐curve for three transitional central European countries – the Czech Republic, Hungary, and Poland – in their bilateral trade with respect to Germany. Our findings suggest that for each country there are some characteristics associated with a J‐curve effect: after a (real or nominal) depreciation the export‐to‐import ratio briefly drops to below its initial value within a few months and then rises to a long run equilibrium value higher than the initial one. 相似文献