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61.
本文使用结构方程方法,基于问卷调查结果,对政策和经济环境变化对于企业投资决策方法选择的影响进行了研究。研究结果表明,政策环境对企业投资决策方法有影响,在政策因素变化条件下,上市公司回避使用净现值方法;经济环境对于企业投资决策方法影响不大,论文分析结果没有表现出经济因素是否变化对投资决策方法选择有明显影响。 相似文献
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Tobin Q反映了企业价值吗——基于市场投机性的视角 总被引:2,自引:1,他引:2
Tobin Q被国内外财务学界广泛应用于企业价值的相关研究.本文提出,尽管Tobin Q与企业价值的内在关系得到了国外理论模型和经验证据的支持,但是我国暂时不具备全面应用Tobin Q的条件.对2002-2005年我国上市公司的实证研究表明,Tobin Q未能对全体上市公司的市场价值提供可靠度量,这一结论在控制了亏损的影响后没有发生改变.进一步,本文基于对我国资本市场现实背景的分析提出,股票市场的投机性可能对Tobin Q的应用存在一定影响.实证结果发现,投机性对Tobin Q的适用性问题提供了一定的解释. 相似文献
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以2016~2017年间中证中小投资者服务中心(以下简称"中证投服")提起的4例证券支持诉讼为研究对象,本文深入分析了该组织在证券支持诉讼中的作用实现机理及其在中小投资者利益保护方面所产生的直接经济后果和溢出效应。本文发现:中证投服提起的证券支持诉讼在很大程度上改善了虚假陈述案件的赔偿机制,主要体现为赔付主体更加合理化,赔偿金额的计算更加科学,赔付比例有明显提升,赔偿款项的执行力度得以加强;在作用实现机理方面,中证投服作为投资者保护公益组织向中小股东提供了公益服务,同时又具备政府弹性监管的色彩,与我国现行的司法制度形成互补;更为重要的是,中证投服参与证券支持诉讼产生了显著的溢出效应,在唤醒中小股东维权意识的同时,明显提升了民间律师团体的活跃程度,进而从整体上极大地带动了民间股东诉讼的兴起。 相似文献
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Jidan Huang Feifeng Zheng Yinfeng Xu Ming Liu 《Journal of Combinatorial Optimization》2018,35(1):216-223
In this work we investigate the online over-list MapReduce processing problem on two identical parallel machines, aiming at minimizing the makespan. Jobs are revealed one by one, and each job consists of one map task and one reduce task. The map task can be arbitrarily split and processed on both machines simultaneously, while the reduce task has to be processed on a single machine and it cannot be started unless the map task has been completed. We first show that the general case of the problem reduces to the classical two machine online scheduling model with an optimal competitive ratio of 3/2. For a special case where the map task is at least as long as the reduce task, we prove that no online algorithm can be less than 4/3-competitive. An optimal Greedy algorithm with a matching competitive ratio is proposed as well. 相似文献
68.
Yanjie Zhang Bilal M. Ayyub Dongming Zhang Hongwei Huang Yalda Saadat 《Risk analysis》2019,39(12):2718-2731
The observed global sea level rise owing to climate change, coupled with the potential increase in extreme storms, requires a reexamination of existing infrastructural planning, construction, and management practices. Storm surge shows the effects of rising sea levels. The recent super storms that hit the United States (e.g., Hurricane Katrina in 2005, Sandy in 2012, Harvey and Maria in 2017) and China (e.g., Typhoon Haiyan in 2010) inflicted serious loss of life and property. Water level rise (WLR) of local coastal areas is a combination of sea level rise, storm surge, precipitation, and local land subsidence. Quantitative assessments of the impact of WLR include scenario identification, consequence assessment, vulnerability and flooding assessment, and risk management using inventory of assets from coastal areas, particularly population centers, to manage flooding risk and to enhance infrastructure resilience of coastal cities. This article discusses the impact of WLR on urban infrastructures with case studies of Washington, DC, and Shanghai. Based on the flooding risk analysis under possible scenarios, the property loss for Washington, DC, was evaluated, and the impact on the metro system of Shanghai was examined. 相似文献
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One of the most dynamic and fruitful areas of current health‐related research concerns the various roles of the human microbiome in disease. Evidence is accumulating that interactions between substances in the environment and the microbiome can affect risks of disease, in both beneficial and adverse ways. Although most of the research has concerned the roles of diet and certain pharmaceutical agents, there is increasing interest in the possible roles of environmental chemicals. Chemical risk assessment has, to date, not included consideration of the influence of the microbiome. We suggest that failure to consider the possible roles of the microbiome could lead to significant error in risk assessment results. Our purpose in this commentary is to summarize some of the evidence supporting our hypothesis and to urge the risk assessment community to begin considering and influencing how results from microbiome‐related research could be incorporated into chemical risk assessments. An additional emphasis in our commentary concerns the distinct possibility that research on chemical–microbiome interactions will also reduce some of the significant uncertainties that accompany current risk assessments. Of particular interest is evidence suggesting that the microbiome has an influence on variability in disease risk across populations and (of particular interest to chemical risk) in animal and human responses to chemical exposure. The possible explanatory power of the microbiome regarding sources of variability could reduce what might be the most significant source of uncertainty in chemical risk assessment. 相似文献
70.
In order to broadcast an alert message from the accident site to the control center as soon as possible, the roadside units (RSUs) act as the critical component in vehicular ad hoc networks (VANETs). It is not possible to make a pervasive RSU deployment due to the huge cost and market requirement. Hence, how to deploy a minimum number of RSUs in a given region becomes a challenge problem. In this paper, we present an analysis for the total delay of broadcasting alert messages in VANETs along highways. Based on the analysis, the relationship between optimal number of RSUs with the highway distance is given. Moreover, the experiment results verifies the delay analysis and the optimization of RSUs deployment. 相似文献