Author
Jörn Altmann
Other affiliations: Hewlett-Packard, University of Erlangen-Nuremberg, International University, Cambodia ...read more
Bio: Jörn Altmann is an academic researcher from Seoul National University. The author has contributed to research in topics: Cloud computing & The Internet. The author has an hindex of 28, co-authored 215 publications receiving 3030 citations. Previous affiliations of Jörn Altmann include Hewlett-Packard & University of Erlangen-Nuremberg.
Topics: Cloud computing, The Internet, Service provider, Grid computing, Grid
Papers published on a yearly basis
Papers
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TL;DR: A theoretical model based on social network theories and analytical methods for exploring collaboration (co-authorship) networks of scholars suggests that the professional social network of researchers can be used to predict the future performance of researchers.
380 citations
TL;DR: The findings show the importance of governing form factors such as mobile system in the development of social commerce in emerging markets and familiarity and trust play a major role in mediating exchange between sellers and buyers and its positive effects in buyers’ perceived usefulness of each social commerce platform.
131 citations
04 Jan 2011
TL;DR: A theoretical model based on social network theory shows that scholars, who maintain a strong co-authorship relationship to only one co-author of a group of linked co-authors, perform better than those researchers with many relationships to the same group of links.
Abstract: In this study, we develop a theoretical model based on social network theory to understand how the collaboration (co-authorship) network of scholars correlates to the research performance of scholars. For this analysis, we use social network analysis (SNA) measures (i.e., normalized closeness centrality, normalized betweenness centrality, efficiency, and two types of degree centrality). The analysis of data shows that the research performance of scholars is positively correlated with two SNA measures (i.e., weighted degree centrality and efficiency). In particular, scholars with strong ties (i.e., repeated co-authorships, i.e., high weighted degree centrality) show a better research performance than those with low ties (e.g., single co-authorships with many different scholars). The results related to efficiency show that scholars, who maintain a strong co-authorship relationship to only one co-author of a group of linked co-authors (i.e., co-authors that have joined publications), perform better than those researchers with many relationships to the same group of linked co-authors.
118 citations
TL;DR: This paper suggests a cost model for the most general form of a cloud, namely federated hybrid clouds, which is composed of a private cloud and a number of interoperable public clouds and shows that the service placement algorithm with the cost model minimizes the spending for computational services.
100 citations
TL;DR: In recent years, the increasing prices of fossil fuels and concerns about the environm... as discussed by the authors have led to a significant increase in electricity consumption in the world, accounting for an increasing share of global energy demand.
Abstract: Electricity consumption will comprise an increasing share of global energy demand during the next two decades. In recent years, the increasing prices of fossil fuels and concerns about the environm ...
86 citations
Cited by
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TL;DR: Some of the major results in random graphs and some of the more challenging open problems are reviewed, including those related to the WWW.
Abstract: We will review some of the major results in random graphs and some of the more challenging open problems. We will cover algorithmic and structural questions. We will touch on newer models, including those related to the WWW.
7,116 citations
Journal Article•
2,366 citations
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01 Jan 1982
TL;DR: In this article, the authors discuss leading problems linked to energy that the world is now confronting and propose some ideas concerning possible solutions, and conclude that it is necessary to pursue actively the development of coal, natural gas, and nuclear power.
Abstract: This chapter discusses leading problems linked to energy that the world is now confronting and to propose some ideas concerning possible solutions. Oil deserves special attention among all energy sources. Since the beginning of 1981, it has merely been continuing and enhancing the downward movement in consumption and prices caused by excessive rises, especially for light crudes such as those from Africa, and the slowing down of worldwide economic growth. Densely-populated oil-producing countries need to produce to live, to pay for their food and their equipment. If the economic growth of the industrialized countries were to be 4%, even if investment in the rational use of energy were pushed to the limit and the development of nonpetroleum energy sources were also pursued actively, it would be extremely difficult to prevent a sharp rise in prices. It is evident that it is absolutely necessary to pursue actively the development of coal, natural gas, and nuclear power if a physical shortage of energy is not to block economic growth.
2,283 citations
01 Apr 2011
TL;DR: The strengths, weaknesses, opportunities and threats for the cloud computing industry are identified and some of the key issues facing governmental agencies who will have to become intimately involved in the regulation of cloud computing are outlined.
Abstract: The evolution of cloud computing over the past few years is potentially one of the major advances in the history of computing. However, if cloud computing is to achieve its potential, there needs to be a clear understanding of the various issues involved, both from the perspectives of the providers and the consumers of the technology. While a lot of research is currently taking place in the technology itself, there is an equally urgent need for understanding the business-related issues surrounding cloud computing. In this article, we identify the strengths, weaknesses, opportunities and threats for the cloud computing industry. We then identify the various issues that will affect the different stakeholders of cloud computing. We also issue a set of recommendations for the practitioners who will provide and manage this technology. For IS researchers, we outline the different areas of research that need attention so that we are in a position to advice the industry in the years to come. Finally, we outline some of the key issues facing governmental agencies who, due to the unique nature of the technology, will have to become intimately involved in the regulation of cloud computing.
2,016 citations