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Aufsatz Review of Flux Interaction of Differently Aligned Magnetic Fields in Inductors and Transformers 

Pfeiffer, Jonas; Küster, Pierre; Friebe, Jens; Zacharias, Peter; Schulz, Ilka Elisa Marie (2020-12-24)
Magnetic devices are used in the majority of power electronic applications, e.g. power electronic converters, mains filters or burst/surge protection. Typically, they are the bulkiest and most cost-intensive components. Flux interaction of differently aligned magnetic fields in inductors and transformers can be one opportunity for size and cost reduction. It enables controllable magnetic devices through an additional manipulated variable to improve application design. The presented article gives an overview about ...
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Aufsatz Effect of Auger recombination and leakage on the droop in InGaN/GaN quantum well LEDs 

Römer, Friedhard; Witzigmann, Bernd (Optical Society of America, 2014)
We investigate the effect of the epitaxial structure and the acceptor doping profile on the efficiency droop in InGaN/GaN LEDs by the physics based simulation of experimental internal quantum efficiency (IQE) characteristics. The device geometry is an integral part of our simulation approach. We demonstrate that even for single quantum well LEDs the droop depends critically on the acceptor doping profile. The Auger recombination was found to increase stronger than with the third power of the carrier density and has ...
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Aufsatz Towards semantic web mining 

Berendt, Bettina; Hotho, Andreas; Stumme, Gerd (2002)
Semantic Web Mining aims at combining the two fast-developing research areas Semantic Web and Web Mining. The idea is to improve, on the one hand, the results of Web Mining by exploiting the new semantic structures in the Web; and to make use of Web Mining, on overview of where the two areas meet today, and sketches ways of how a closer integration could be profitable.
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Aufsatz Mining the World Wide Web - Methods, Applications, and Perspectives 

Hotho, Andreas; Stumme, Gerd (2007-07)
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Aufsatz "Selbst"-Eigenschaften in verteilten Systemen 

Fromm, Jochen; Zapf, Michael (2005)
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Aufsatz Fast computation of concept lattices using data mining techniques 

Stumme, Gerd; Taouil, Rafik; Bastide, Yves; Pasquier, Nicolas; Lakhal, Lotfi (2000)
We present a new algorithm called TITANIC for computing concept lattices. It is based on data mining techniques for computing frequent itemsets. The algorithm is experimentally evaluated and compared with B. Ganter's Next-Closure algorithm.
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Aufsatz 8th International Conference on Conceptual Structures: logical, linguistic, and computational issues 

Stumme, Gerd (2000)
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Aufsatz Gone with the internet - How the old education was lost 

Wegner, Lutz M. (2015-04-08)
Despite its young history, Computer Science Education has seen a number of "revolutions". Being a veteran in the field, the author reflects on the many changes he has seen in computing and its teaching. The intent of this personal collection is to point out that most revolutions came unforeseen and that many of the new learning initiatives, despite high financial input, ultimately failed. The author then considers the current revolution (MOOC, inverted lectures, peer instruction, game design) and, based on the ...
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Aufsatz A storage scheme for an automated archive 

Wegner, Lutz M.; Khalifa, Reda (University of Kassel, Department of Mathematics and Computer Science, 1989)
Presentation given at the Al-Azhar Engineering First Conference, AEC’89, Dec. 9-12 1989, Cairo, Egypt. The paper presented at AEC'89 suggests an infinite storage scheme divided into one volume which is online and an arbitrary number of off-line volumes arranged into a linear chain which hold records which haven't been accessed recently. The online volume holds the records in sorted order (e.g. as a B-tree) and contains shortest prefixes of keys of records already pushed offline. As new records enter, older ones ...
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Aufsatz Interface issues in the ESCHER visual database editor 

Wegner, Lutz (1997)
Presentation at the 1997 Dagstuhl Seminar "Evaluation of Multimedia Information Retrieval", Norbert Fuhr, Keith van Rijsbergen, Alan F. Smeaton (eds.), Dagstuhl Seminar Report 175, 14.04. - 18.04.97 (9716). - Abstract: This presentation will introduce ESCHER, a database editor which supports visualization in non-standard applications in engineering, science, tourism and the entertainment industry. It was originally based on the extended nested relational data model and is currently extended to include object-relational ...
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