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51.
Rolf Uwe Fülbier Joachim Gassen Thorsten Sellhorn 《Zeitschrift für Betriebswirtschaft》2008,78(12):1227-1230
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The mineral raw materials industry is essential for manufacturing by providing the basic materials for their value adding processes. In the last decade, the integration of operations of the industry within global manufacturing supply chains has progressed greatly. The processes of the different stakeholders have been extensively analysed and modelled according to standardised frameworks such as the supply chain operations reference (SCOR) model. However, as of today, not all stakeholders are integrated to the same extent. Especially, in the early part of the supply chain, deep integration of the mineral raw materials industry is still an exception. This industry and its processes differ greatly from the average manufacturing company’s processes. Not being directly comparable results in the absence of applications of standardised modelling tools for supply chains like the above-mentioned SCOR model. These circumstances hinder the integration, understanding and exchange between industries that rely significantly on each other. In a first attempt to create a basis for further research, this study analyses, elaborates and compares the challenges and requirements of supply chain processes, with a special focus on sourcing processes, in manufacturing and mining. Based on these findings, an adaption of the SCOR model towards applicability in mining and mining supply processes is presented, followed by a critical discussion of the results and implications, later concluded by a short outlook on further research. 相似文献
53.
We investigate the asymptotic behavior of the probability density function (pdf) and the cumulative distribution function (cdf) of Student's t-distribution with ν > 0 degrees of freedom (t ν for short) for ν tending to infinity when the argument x = x ν of the pdf (cdf) depends on ν and tends to ± ∞ (?∞). To this end, we consider the ratio of the pdf's (cdf's) of the t ν- and the standard normal distribution. Depending on the choice of the argument x ν, the pdf-ratio (cdf-ratio) tends to 1, a fixed value greater than 1, or to ∞. As a byproduct, we obtain a result for Mill' ratio when x ν → ?∞. 相似文献
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Prof. Dr. Thorsten Posselt Prof. Dr. Dubravko Radić Dorothee Tammen 《Zeitschrift für Betriebswirtschaft》2010,80(7-8):841-867
E-Commerce sales have been constantly rising over the past years. Among the reasons for this trend are advantages such as reduced search costs and low transaction costs for the buyer. A disadvantage of online shopping is that customers cannot inspect the product they buy online. In Germany, customers are entitled to get full refund when withdrawing from any distance selling. Customers can withdraw from a contract within two weeks without any explanation. Many retailers in the USA do not refund the full price to the customer in case of product return and charge restocking fees. A reason for such a restrictive return policy is the reduction of opportunistic product returns. In this paper, the authors compare prices in online-shops for identical products in the USA and Germany. The comparison shows that the alleged consumer protection achieved by a legal prohibition of restocking fees leads to higher average prices for electronic products in Germany. 相似文献
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Jens Kratzmann Thorsten Schneider 《KZfSS K?lner Zeitschrift für Soziologie und Sozialpsychologie》2009,61(2):211-234
Although there is a regular age of school entry in Germany, some children start school later than usual and some children start ahead of schedule. While there has been some decrease in delayed school entries in the last years, the rate of premature school entry has increased substantially. Paradoxically, while the delayed entry is primarily because professionals rate a child as not ready for school, the premature entry is mainly based on parents’ choice. The first aim of the paper is to discover whether kindergarten attendance can reduce the risk of a delayed entry. The arguments and hypotheses are mainly based on the theory on the ecology of human development of Bronfenbrenner. The empirical analyses demonstrate that low educated families profit most by kindergarten attendance, but only if the child begins attending the care institution before reaching age four. The second aim concerns considerations in regard to the decision of prematurely entering school. Socio-economic conditions are not as important at this point as compared with a delay in school entry. However, there are some effects indicating that higher educated parents foster a premature entry to elementary schools. The analyses are based on over 1.400 children in the relevant age group and their parents taking part in the large nationwide German Socio-Economic Panel Study (SOEP). 相似文献
56.
We are considered with the problem of m simultaneous statistical test problems with composite null hypotheses. Usually, marginal p-values are computed under least favorable parameter configurations (LFCs), thus being over-conservative under non-LFCs. Our proposed randomized p-value leads to a tighter exhaustion of the marginal (local) significance level. In turn, it is stochastically larger than the LFC-based p-value under alternatives. While these distributional properties are typically nonsensical for m =1, the exhaustion of the local significance level is extremely helpful for cases with m>1 in connection with data-adaptive multiple tests as we will demonstrate by considering multiple one-sided tests for Gaussian means. 相似文献
57.
Ferdinand M. Vieider Mathieu Lefebvre Ranoua Bouchouicha Thorsten Chmura Rustamdjan Hakimov Michal Krawczyk Peter Martinsson 《Journal of the European Economic Association》2015,13(3):421-452
Attitudes towards risk and uncertainty have been indicated to be highly context‐dependent, and to be sensitive to the measurement technique employed. We present data collected in controlled experiments with 2,939 subjects in 30 countries measuring risk and uncertainty attitudes through incentivized measures as well as survey questions. Our data show clearly that measures correlate not only within decision contexts or measurement methods, but also across contexts and methods. This points to the existence of one underlying “risk preference”, which influences attitudes independently of the measurement method or choice domain. We furthermore find that answers to a general and a financial survey question correlate with incentivized lottery choices in most countries. Incentivized and survey measures also correlate significantly between countries. This opens the possibility to conduct cultural comparisons on risk attitudes using survey instruments. 相似文献
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