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Institution

University of Paderborn

EducationPaderborn, Nordrhein-Westfalen, Germany
About: University of Paderborn is a education organization based out in Paderborn, Nordrhein-Westfalen, Germany. It is known for research contribution in the topics: Control reconfiguration & Software. The organization has 6684 authors who have published 16929 publications receiving 323154 citations.


Papers
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Proceedings ArticleDOI
19 May 2002
TL;DR: A method and a corresponding tool is described which assist design recovery and program understanding by recognising instances of design patterns semi-automatically based on a new recognition algorithm which works incrementally rather than trying to analyse a possibly large software system in one pass without any human intervention.
Abstract: A method and a corresponding tool is described which assist design recovery and program understanding by recognising instances of design patterns semi-automatically. The approach taken is specifically designed to overcome the existing scalability problems caused by many design and implementation variants of design pattern instances. Our approach is based on a new recognition algorithm which works incrementally rather than trying to analyse a possibly large software system in one pass without any human intervention. The new algorithm exploits domain and context knowledge given by a reverse engineer and by a special underlying data structure, namely a special form of an annotated abstract syntax graph. A comparative and quantitative evaluation of applying the approach to the Java AWT and JGL libraries is also given.

206 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigate Inconel 939 processed by selective laser melting (SLM) and reveal the differences to the conventional cast alloy, showing that the microstructure of the SLM-material is highly influenced by the heat flux during layer-wise manufacturing and consequently anisotropic microstructural features prevail.
Abstract: Nickel-based superalloys, such as Inconel 939, are a long-established construction material for high-temperature applications and profound knowledge of the mechanical properties for this alloy produced by conventional techniques exists. However, many applications demand for highly complex geometries, e.g. in order to optimize the cooling capability of thermally loaded parts. Thus, additive manufacturing (AM) techniques have recently attracted substantial interest as they provide for an increased freedom of design. However, the microstructural features after AM processing are different from those after conventional processing. Thus, further research is vital for understanding the microstructure-processing relationship and its impact on the resulting mechanical properties. The aim of the present study was to investigate Inconel 939 processed by selective laser melting (SLM) and to reveal the differences to the conventional cast alloy. Thorough examinations were conducted using electron backscatter diffraction, transmission electron microscopy, optical microscopy and mechanical testing. It is demonstrated that the microstructure of the SLM-material is highly influenced by the heat flux during layer-wise manufacturing and consequently anisotropic microstructural features prevail. An epitaxial grain growth accounts for strong bonding between the single layers resulting in good mechanical properties already in the as-built condition. A heat treatment following SLM leads to microstructural features different to those obtained after the same heat treatment of the cast alloy. Still, the mechanical performance of the latter is met underlining the potential of this technique for producing complex parts for high temperature applications.

205 citations

Posted Content
TL;DR: In this article, the authors provide an endogenous growth model to illuminate the role of entrepreneurial start-up firms in structural economic transformation and show how opportunity-driven entrepreneurship can drive structural transformation through innovation, provision of intermediate inputs and services, and by increasing employment and productivity in both the modern and traditional sectors.
Abstract: A stylized fact of economic development is the structural transformation of countries from traditional, mainly agricultural societies to modern economies dominated by manufacturing and services. In this paper we provide an endogenous growth model to illuminate the role of entrepreneurial start-up firms in structural economic transformation. We follow the Lewis-model?s distinction between a traditional and modern sector, and underpin this with micro-foundations. We specify mature and start-up entrepreneurs and make a distinction between survivalist self-employment activities in the traditional sector, and opportunity-driven entrepreneurship in the modern sector. The model shows how opportunity-driven entrepreneurship can drive structural transformation through innovation, provision of intermediate inputs and services (which permits greater specialization in manufacturing), and by increasing employment and productivity in both the modern and traditional sectors.

204 citations

Book ChapterDOI
01 Jan 2002
TL;DR: This chapter focuses on set oriented numerical methods for dynamical systems, which allow extracting statistical information on the dynamical behavior via the computation of natural invariant measures or almost invariant sets.
Abstract: This chapter focuses on set oriented numerical methods for dynamical systems. The set oriented numerical methods can be used to approximate different types of invariant sets or invariant manifolds but they also allow extracting statistical information on the dynamical behavior via the computation of natural invariant measures or almost invariant sets. In contrast to other numerical techniques, these methods do not rely on the computation of single long-term trajectories but rather use the information obtained from several short-term trajectories. Set oriented method can also be used for the computation of invariant manifolds. Although the method can, in principle, be applied to manifolds of arbitrary hyperbolic invariant sets. An important statistical characterization of the behavior of a dynamical system is given by so-called SRB (Sinai–Ruelle–Bowen) measures. The important property of these invariant measures is that they lend weight to a region in phase space according to the probability by which typical trajectories visit this region.

203 citations

Proceedings ArticleDOI
21 May 2002
TL;DR: This paper addresses the potential benefit of sharing jobs between independent sites in a grid computing environment and the aspect of parallel multi-site job execution on different sites is discussed.
Abstract: This paper addresses the potential benefit of sharing jobs between independent sites in a grid computing environment. Also the aspect of parallel multi-site job execution on different sites is discussed. To this end, various scheduling algorithms have been simulated for several machine configurations with different workloads which have been derived from real traces. The results showed that a significant improvement in terms of a smaller average response time is achievable. The usage of multi-site applications can additionally improve the results as long as the increase of the execution time due to communication overhead is limited to about 25%.

202 citations


Authors

Showing all 6872 results

NameH-indexPapersCitations
Martin Karplus163831138492
Marco Dorigo10565791418
Robert W. Boyd98116137321
Thomas Heine8442324210
Satoru Miyano8481138723
Wen-Xiu Ma8342020702
Jörg Neugebauer8149130909
Thomas Lengauer8047734430
Gotthard Seifert8044526136
Reshef Tenne7452924717
Tim Meyer7454824784
Qiang Cui7129220655
Thomas Frauenheim7045117887
Walter Richtering6733214866
Marcus Elstner6720918960
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
2023131
2022242
20211,030
20201,010
2019948
2018967