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121.
Prof. Dr. Walter Brenner Prof. Dr. Dimitris Karagiannis Prof. Dr. Lutz Kolbe Dipl.-Kffm. Jens Krüger Prof. Larry Leifer Dr. Hermann-Josef Lamberti Prof. Dr. Jan Marco Leimeister Prof. Dr. Hubert Österle Charles Petrie Prof. Dr. Hasso Plattner Prof. Dr. Gerhard Schwabe Prof. Dr. Falk Uebernickel Prof. Dr. Robert Winter Prof. Dr. Rüdiger Zarnekow 《Business & Information Systems Engineering》2014,6(1):55-61
Business and Information Systems Engineering (BISE) is at a turning point. Planning, designing, developing and operating IT used to be a management task of a few elites in public ad-ministrations and corporations. But the continuous digitization of nearly all areas of life changes the IT landscape fundamentally. Success in this new era requires putting the human perspective – the digital user – at the very heart of the new digitized service-led economy. BISE faces not just a temporary trend but a complex socio-technical phenomenon with far-reaching implications. The challenges are manifold and have major consequences for all stakeholders, both in information systems and management research as well as in practice. Corporate processes have to be re-designed from the ground up, starting with the user’s perspective, thus putting usage experience and utility of the individual center stage. The digital service economy leads to highly personalized application systems while organizational functions are being fragmented. Entirely new ways of interacting with information systems, in particular beyond desktop IT, are being invented and established. These fundamental challenges require novel approaches with regards to innovation and development methods as well as adequate concepts for enterprise or service system architectures. Gigantic amounts of data are being generated at an accelerating rate by an increasing number of devices – data that need to be managed. In order to tackle these extraordinary challenges we introduce ‘user, use & utility’ as a new field of BISE that focuses primarily on the digital user, his or her usage behavior and the utility associated with system usage in the digitized service-led economy. The research objectives encompass the development of theories, methods and tools for systematic requirement elicitation, systems design, and business development for successful Business and Information Systems Engineering in a digitized economy – information systems that digital users enjoy using. This challenge calls for leveraging insights from various scientific disciplines such as Design, Engineering, Computer Science, Psychology and Sociology. BISE can provide an integrated perspective, thereby assuming a pivotal role within the digitized service led economy. 相似文献
122.
Wolfgang Eichert 《Metroeconomica》2014,65(1):136-153
The present paper considers a constant returns to scale non‐joint production economy with one primary factor (labour). It follows from the non‐substitution theorem that macroeconomic variables are completely determined by the wage–profit distribution in a long‐period position. We investigate the special case in which production in each sector as well as consumption are characterized by means of Cobb–Douglas functions. Despite the non‐linearity, this parametrization allows us to compute sectoral and macroeconomic variables in simple and intuitive equations. As noted in earlier literature, many variables behave differently than would be expected on basis of a one‐sectoral Solow growth model. 相似文献
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124.
The Hannah-Kay [1977] generalized concentration index contains the well-known Herfindahl [1950]-Hirschman [1945] and the entropy indices as particular cases. In this papaer we show that the Hannah-Kay class can be regarded as a particular member of a generalized family of indices, which we refer to as self-weighted quasilinear means. We then show that among all self-weighted quasilinear means the Hannah-Kay family is the only class of concentration indices which satisfies the replication principle, a requirement which states that an m-fold replication of the industry, firm by firm, will multiply the concentration index by the factor 1/m.The refereeing process of this paper was handled through N.R. Adam.We are grateful to two anonymous referees for their suggestions. 相似文献
125.
Ohne Zusammenfassung 相似文献
126.
Wolfgang Bessler 《European Journal of Finance》2013,19(3):186-201
This article reviews the empirical evidence for equity returns, bond returns, and the equity premium in the German capital market for the period from 1870 to 1995. Taken together, the studies reviewed provide convincing evidence that over longer investment periods, average equity returns have been higher than average bond returns. These excess returns, however, have been highly volatile and negative in many years, illustrating the higher risk of equity investments. Moreover, market timing had a major positive or negative impact on overall returns. Despite the historical evidence of a substantial equity premium there is still little equity investment by German households. 相似文献
127.
Stanley R. Thompson Wolfgang Gohout Roland Herrmann 《Journal of Agricultural Economics》2002,53(1):1-13
We use a nonlinear commodity market model to assess, theoretically and empirically, the impacts of recent reforms of the CAP on prices and economic welfare in the EU. The empirical analysis is based on an aggregate structural econometric model of the EU wheat economy and its links to the rest of the world. Instability issues are also investigated. Impacts of CAP reforms on the variance of domestic and world prices are analysed and a Monte Carlo simulation is used to evaluate uncertainty in the model's welfare computations. Recent reforms led to a net welfare gain within the EU during the period 1993–2000. Additional budgetary costs are less than the welfare gains of consumers and producers. Producers gained as lower price support was overcompensated by additional direct payments. 相似文献
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129.
Dipl.-Wirtschaftsing. Bastian Sauer Prof. Dr.-Ing. Joachim Müller-Kirchenbauer 《能源经济杂志》2014,38(2):131-148
The German gas supply system is separated into two networks: one for high-calorific gas (H-gas) and one for low-calorific gas (L-gas). In particular, the L-gas volume is declining significantly, which means that there will be problems in security of supply in near future. This paper highlights the most important aspects that have to be considered when adjusting the German gas network to the future decline of L-gas production. First, the article discusses different possible adjustment options: (1) adjustment of market areas from low-calorific gas supply to high-calorific gas supply, (2) blending facilities (conversion of high calorific gas using nitrogen or air) and (3) the combination of both options. Subsequently, the authors outline the necessary planning process that must precede any adjustment option. The so-called network differentiation is followed by the network modeling: Using the net present value method and taking into account certain constraints, the authors define a simple optimization problem to determine the most economical investment and adjustment times for each option. Based on first model considerations it can be concluded that the implementation of adjustment options should be delayed as long as possible without compromising the security of supply. Nevertheless, an early start of the planning process is mandatory to ensure that adjustment options can be established in due time before an L-gas supply deficit occurs. The question, which adjustment option should be chosen, cannot be answered universally. It depends on the conditions and structure of the network as well as the structure of the final consumers. 相似文献
130.
One of the most controversial regulatory issues in Europe (and elsewhere) is whether the emerging next-generation access (NGA) infrastructure should be subjected to cost-based access regulation or whether at least a temporary removal of ex ante obligations (“regulatory holidays”) should be granted. Likewise, the role of NGA-specific state aid policies is increasingly capturing the attention of policy makers and the academic literature. 相似文献