A unified approach to systemic risk measures via acceptance sets

We specify a general methodological framework for systemic risk measures via multidimensional acceptance sets and aggregation functions. Existing systemic risk measures can usually be interpreted as the minimal amount of cash needed to secure the system after aggregating individual risks. In contrast, our approach also includes systemic risk measures that can be interpreted as the minimal amount of cash that secures the aggregated system by allocating capital to the single institutions before aggregating the individual risks. An important feature of our approach is the possibility of allocating cash according to the future state of the system (scenario‐dependent allocation). We also provide conditions that ensure monotonicity, convexity, or quasi‐convexity of our systemic risk measures.     

Threats to the Validity of Logistics and Supply Chain Management Research

To increase the relevance of logistics and supply chain academic research, this paper recommends the development and testing of middle‐range theory and practice‐level theory. Yet, there are a number of research issues that arise when academic researchers test middle‐range and practice‐level theory, both in measuring constructs and in testing theoretical relationships between constructs. Concerning the measurement of constructs, this paper recommends that academic researchers pay more attention to content validity and undertake rigorous processes to ensure content validity. In addition, academic researchers need to more explicitly define constructs as either reflective or formative. If the construct is defined as formative, then the traditional statistical approaches to validate these measurement scales are not recommended. The appropriate use of employing single‐item measures for concrete constructs is discussed. In regard to conducting hypothesis tests, research issues associated with multicollinearity and omitted variable bias are discussed. Relative weight analysis is ideal for testing theoretical models and research hypotheses when survey data are obtained, multicollinearity is present, and there are a large number of independent variables predicting a dependent variable. Thus, relative weight analysis is ideal for testing research hypotheses in logistics and supply chain management.     

Managing turnaround performance through Collaborative Decision Making

The purpose of this paper is to explore turnaround performance as a resultant from both Collaborative Decision Making (CDM) processes and collaborative measures. This paper presents how CDM operates in the Turnaround Process (TAP) to propose a new method for managing the collaborative turnaround performance of all actors by predicting the most critical indicators. To achieve this, data from a CDM airport is used. Sample data of 6500 observations, taken from turnaround movements handled in 2014 at Madrid-Barajas Airport, were obtained from three separate databases and analyzed separately (in three databases). To predict turnaround performance, this paper also introduces a predictor dependent variable called “star values” as a measure of minimal delay conditions in order to predict time performance. The analysis shows that the proposed method unveils a new approach in determining how collaborative performance can be measured in the TAP and the predicted key performance indicators, which shows variations in the predicted CDM indicators. Results challenge managers and policymakers to find which improvements can be enacted for better usage of airport infrastructures and resources for optimum use as well as enhanced TAP. In terms of theory use and extension, the study reveals how CDM is an essential element in the literature on air traffic management.     

服务质量的要素、测量及关系研究

服务质量概念是由对产品质量的定义逐渐延伸到服务中而产生的.基于对服务质量的相关研究文献的回顾,从服务质量要素、服务质量测量及服务质量与顾客满意、顾客忠诚、企业绩效之间的关系研究角度来展开论述,对服务质量的国内外相关研究做了一些总结与展望.服务质量的研究经历了一个由概念界定、测量维度的探索向服务质量与其他服务要素之间的关系及在不同行业的适用性逐步扩展的过程,对于服务行业及服务质量标准的制定都是一个不可缺少的参考要素.     

The challenge of legitimizing spatially differentiated regulation: Experiences from the implementation of the Danish Buffer zone act

Differentiating regulation is a promising approach to agri-environmental regulation that may potentially reduce the environmental impact of agriculture at the lowest possible costs for the farmers and society, but also possesses a number of challenges. In this article, we explore the challenges to the legitimacy of agri-environmental regulation that occurs when the regulatory regime changes from general regulation to differentiated regulation. The analysis is based on a case study of the implementation of the Buffer zone act in Denmark – a regulation that prevents agricultural production in a 10 (later 9) meter fringe around selected waterbodies. We distinguish between two different ways of legitimizing: Producing knowledge and participation. We conclude that to harvest some of the obvious benefits of differentiated regulation a number of challenges must be resolved, 1) ensuring legitimacy of differentiated regulation is crucial, 2) differentiated regulation imply that farmers are also differentiated, 3) differentiated regulation implies new uncertainties, 4) the current knowledge regime need to be reconfigured, 5) stakeholders feel that they are unevenly treated and 6) it is difficult to establish a win–win solution for all farmers on an individual level.     

河南省农村生态环境的问题与对策分析

农村生态环境建设对于提高农村经济发展水平具有重要意义。文章通过实地调研结合文献分析的方法,对河南省农村环境发展现状进行调研,探讨了河南省农村生态环境存在的主要问题包括水资源短缺、耕地总量下降并伴随土壤退化、森林覆盖率下降、水土流失严重等。该文从政治学层面、社会学层面以及经济学层面系统地阐述了问题形成的原因,并从增强生态环境安全意识、转变农村发展方式、完善相关法规政策、推动科技创新等方面提出了促进河南省农村生态建设的对策措施,旨在为我国农村生态环境良好发展提供理论基础和现实依据。     

Relationship between oil,stock prices and exchange rates: A vine copula based GARCH method

In this paper, we apply a vine copula approach to investigate the dynamic relationship between energy, stock and currency markets. Dependence modeling using vine copulas offers a greater flexibility and permits the modeling of complex dependency patterns for high-dimensional distributions. Using a sample of more than 10 years of daily return observations of the WTI crude oil, the Dow Jones Industrial average stock index and the trade weighted US dollar index returns, we find evidence of a significant and symmetric relationship between these variables. Considering different sample periods show that the dynamic of the relationship between returns is not constant over time. Our results indicate also that the dependence structure is highly affected by the financial crisis and Great Recession, over 2007–2009. Finally, there is evidence to suggest that the application of the vine copula model improves the accuracy of VaR estimates, compared to traditional approaches.     

北京市五星级酒店食品安全现状分析

本文以五星级酒店为研究对象,分析五星级酒店存在的食品安全问题,并针对这些问题提出解决对策,以期保证酒店餐饮食品安全,提高五星级酒店服务质量。     

谈路面表面排水和防水

路基是道路的基础,更是保证路面质量的关键。然而,在现实中,由于需要反复承受各种荷载和自然因素的作用,会导致路基的形状、边坡坡度发生改变,尤其路基表面排水不畅将严重影响路面的质量和稳定性。     

高边坡滑坡分析及处理

在一些基础性开发的建设过程中存在许多地质灾害问题,其中高边坡滑坡现象尤为严重。本文针对高边坡滑坡现象的类型、成因等进行了分析,并提出了相应的解决措施。