@article{LehmannWittpahlZakouretal.2019, author = {Lehmann, Matthias and Wittpahl, Christian and Zakour, Hatem Ben and Braun, Alexander}, title = {Modeling realistic optical aberrations to reuse existing drive scene recordings for autonomous driving validation}, series = {Journal of Electronic Imaging}, volume = {28}, journal = {Journal of Electronic Imaging}, number = {1}, publisher = {SPIE}, issn = {1560-229X}, doi = {10.1117/1.JEI.28.1.013005}, pages = {013005}, year = {2019}, abstract = {Training autonomous vehicles requires lots of driving sequences in all situations. Collecting and labeling these drive scenes is a very time-consuming and expensive process. Currently, it is not possible to reuse these drive scenes with different optical properties, because there exists no numerically efficient model for the transfer function of the optical system. We present a numerical model for the point spread function (PSF) of an optical system that can efficiently model both experimental measurements and lens design simulations of the PSF. The numerical basis for this model is a nonlinear regression of the PSF with an artificial neural network. The novelty lies in the portability and the parameterization of this model. We present a lens measurement series, yielding a numerical function for the PSF that depends only on the parameters defocus, field, and azimuth. By convolving existing images and videos with this PSF, we generate images as if seen through the measured lens. The methodology applies to any optical scenario, but we focus on the context of autonomous driving, where the quality of the detection algorithms depends directly on the optical quality of the used camera system. With this model, it is possible to reuse existing recordings, with the potential to avoid millions of test drive miles. The parameterization of the optical model allows for a method to validate the functional and safety limits of camera-based advanced driver assistance systems based on the real, measured lens actually used in the product.}, language = {en} } @article{LeadbetterHortvonLoewisetal.2012, author = {Leadbetter, S. J. and Hort, M. C. and von L{\"o}wis, S. and Weber, Konradin and Witham, C. S.}, title = {Modeling the resuspension of ash deposited during the eruption of Eyjafjallaj{\"o}kull in spring 2010}, series = {Journal of Geophysical Research: Atmospheres}, volume = {117}, journal = {Journal of Geophysical Research: Atmospheres}, number = {D20}, publisher = {American Geophysical Union (AGU)}, issn = {0148-0227}, doi = {10.1029/2011JD016802}, year = {2012}, abstract = {Eyjafjallaj{\"o}kull, a volcano in southern Iceland, erupted explosively in April and May 2010 depositing ash over a region of more than 3000 km2 to the east and southeast of the volcano. This deposited ash has been frequently remobilized by the wind causing concern for the health of Icelanders living in the region. An investigation was carried out to determine whether it would be possible to produce forecasts of days when high airborne ash concentrations were likely to occur. Information about the spatially varying surface characteristics of the region of deposited ash is not available so in the modeling approach adopted here ash is released from the surface at a rate proportional to the cube of the excess friction velocity (local friction velocity minus a threshold) only when the friction velocity exceeds a threshold. Movement of the resuspended ash is then modeled in a Lagrangian dispersion model. Modeled ash concentrations are compared to observed concentrations from two periods; PM10 observations between 23 May and 2 July 2010 and airborne particle counts between 21 September 2010 and 16 February 2011. More than 66\% of the resuspension episodes between May and July are captured by the model and the relative magnitudes of the modeled episodes in this period are in good agreement with the observations. 66\% of episodes between October and February are also captured by the model although there is an increase in the false alarm rate which appears to be due to the influence of precipitation.}, language = {en} } @article{VersuemerSteffensBlaettermannetal.2020, author = {Vers{\"u}mer, Siegbert and Steffens, Jochen and Bl{\"a}ttermann, Patrick and Becker-Schweitzer, J{\"o}rg}, title = {Modelling evaluations of low-level sounds in everyday situations using linear machine learning for variable selection}, series = {Frontiers in Psychology}, volume = {11}, journal = {Frontiers in Psychology}, publisher = {Frontiers}, issn = {1664-1078}, doi = {10.3389/fpsyg.2020.570761}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-23779}, year = {2020}, language = {en} } @article{BenimEppleKrohmer2005, author = {Benim, Ali Cemal and Epple, B. and Krohmer, B.}, title = {Modelling of pulverised coal combustion by a Eulerian-Eulerian two-phase flow formulation}, series = {Progress in Computational Fluid Dynamics, An International Journal}, volume = {5}, journal = {Progress in Computational Fluid Dynamics, An International Journal}, number = {6}, publisher = {inderscience}, doi = {10.1504/pcfd.2005.007067}, pages = {345}, year = {2005}, language = {en} } @inproceedings{JuerjensOchoaSchmidtetal.2011, author = {J{\"u}rjens, Jan and Ochoa, Mart{\´i}n and Schmidt, Holger and Marchal, Lo{\"i}c and Houmb, Siv Hilde and Islam, Shareeful}, title = {Modelling Secure Systems Evolution: Abstract and Concrete Change Specifications}, series = {Formal Methods for Eternal Networked Software Systems: 11th International School on Formal Methods for the Design of Computer, Communication and Software Systems, SFM 2011, Bertinoro, Italy, June 13-18, 2011. Advanced Lectures}, volume = {LNCS, 6659}, booktitle = {Formal Methods for Eternal Networked Software Systems: 11th International School on Formal Methods for the Design of Computer, Communication and Software Systems, SFM 2011, Bertinoro, Italy, June 13-18, 2011. Advanced Lectures}, editor = {Bernardo, Marco and Issarny, Val{\´e}rie}, publisher = {Springer}, address = {Berlin, Heidelberg}, isbn = {978-3-642-21455-4}, doi = {10.1007/978-3-642-21455-4_15}, pages = {504 -- 526}, year = {2011}, abstract = {Developing security-critical systems is difficult, and there are many well-known examples of vulnerabilities exploited in practice. In fact, there has recently been a lot of work on methods, techniques, and tools to improve this situation already at the system specification and design. However, security-critical systems are increasingly long-living and undergo evolution throughout their lifetime. Therefore, a secure software development approach that supports maintaining the needed levels of security even through later software evolution is highly desirable. In this chapter, we recall the UMLsec approach to model-based security and discuss on tools and techniques to model and verify evolution of UMLsec models.}, language = {en} } @inproceedings{EchternachtStaggePriebeetal.2015, author = {Echternacht, David and Stagge, Hanno and Priebe, Jens and Wiernes, Pablo Ezequiel and Jagielski, Kai and Petri, Anne-Kathrin and Drießen, Sarah and Trevisan, Bianka and Digmayer, Claas and Oberst, Christian A. and Keysselitz, B{\"a}rbel and Kremer, Martin and Sieber, Sandra and Krapp, Stefan and Jakobs, Eva-Maria and Frenz, Martin and Lohrberg, Frank and Wachten, Kunibert and Moser, Albert}, title = {Modelling, Planning, Design and Evaluation of DC-Distribution Grids}, series = {International ETG Congress 2015 : die Energiewende ; blueprints for the new energy age ; proceedings ; November 17 - 18, 2015, World Conference Center, Bonn}, booktitle = {International ETG Congress 2015 : die Energiewende ; blueprints for the new energy age ; proceedings ; November 17 - 18, 2015, World Conference Center, Bonn}, publisher = {VDE-Verl.}, address = {Bonn}, pages = {289 -- 295}, year = {2015}, language = {en} } @misc{Mehlhorn2017, author = {Mehlhorn, Nils}, title = {Modern Cross-Platform Development for Mobile Applications}, address = {D{\"u}sseldorf}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-11276}, pages = {43}, year = {2017}, abstract = {While developing for multiple platforms at once seems like a convenient solution, there are several challenges arising when trying to abstract the entire mobile development. This paper is meant to evaluate current cross-platform development for mobile applications. The background for its necessity, its conceptual approach and the problems to face when developing cross-platform were determined and explained in detail. Afterwards, certain solutions were evaluated against the former insights. Based on the results, an informed discussion and conclusion was performed. The mobile environment consist of only two big players by now, Android and iOS. These operating systems differ in architecture, design and consequently in the way applications are developed for each of them. Therefore, high demands are made towards cross-platform solutions. Tools which allow for the creation of applications for multiple platforms at once have to match native applications in regard to user experience and performance. At the same time they need to be able to optimize developments with the goal of being cost efficient. Apache Cordova, Xamarin and NativeScript were selected for evaluation in regard to their ability to meet these requirements. Cordova acts as the comparison group of cross-platform tools. It is the big player in the field and there are reasons for this. However, aspiring solutions with higher nativity and ambitious approaches are emerging. Xamarin and NativeScript deliver top quality results while offering loosely coupled developments. Therefore it is possible to develop high quality applications and still benefit from the advantages of platform-independent solutions. As a consequence mobile development is about to change in the foreseeable future. More sophisticated approaches may lead to a higher number of developments done cross-platform, and rightfully so.}, language = {en} } @inproceedings{HurdTruckenmuellerThammetal.2005, author = {Hurd, Paul and Truckenmueller, Frank and Thamm, Norbert and Pollak, Helmut and Neef, Matthias and Deckers, Mathias}, title = {Modern Reaction HP/IP Turbine Technology Advances and Experiences}, series = {Proceedings of the ASME Power Conference - 2005 : includes papers from the 2005 International Conference on Power Engineering (ICOPE) ; presented at the 2005 ASME Power Conference, April 5 - 7, 2005, Chicago, Illinois, USA}, booktitle = {Proceedings of the ASME Power Conference - 2005 : includes papers from the 2005 International Conference on Power Engineering (ICOPE) ; presented at the 2005 ASME Power Conference, April 5 - 7, 2005, Chicago, Illinois, USA}, publisher = {ASME}, address = {New York}, isbn = {0-7918-4182-0}, doi = {10.1115/PWR2005-50085}, pages = {425 -- 435}, year = {2005}, language = {en} } @article{EliassonPalssonWeber2011, author = {El{\´i}asson, J{\´o}nas and Palsson, Asgeir and Weber, Konradin}, title = {Monitoring ash clouds for aviation}, series = {Nature}, volume = {475}, journal = {Nature}, number = {7357}, publisher = {Springer Nature}, doi = {10.1038/475455b}, pages = {455}, year = {2011}, language = {en} } @article{GalbanMaderwaldEggebrechtetal.2005, author = {Galban, Craig and Maderwald, Stefan and Eggebrecht, Holger and Grote, Wolfgang and de Greiff, A. and Uffmann, K. and Ladd, M. E.}, title = {Monitoring the Effects of Chronic Obstructive Pulmonary Disease on Muscle Elasticity by MR Elastography}, series = {Proc. Intl. Soc. Mag. Reson. Med.}, volume = {13}, journal = {Proc. Intl. Soc. Mag. Reson. Med.}, pages = {2015}, year = {2005}, abstract = {Men afflicted with chronic obstructive pulmonary disease (COPD) show signs of muscle dysfunction, such as increased muscle fatigue and acidosis during exercise. We hypothesize that muscle elasticity of the lower extremities differs between patients with COPD and age-related controls. The shear modulus of the soleus muscle was measured non-invasively using MR elastography (MRE) at 0\%, 5\%, 10\%, 15\%, and 20\% of the subject's maximum applied force. The results from this study showed statistical differences between the patients and controls, even though there were no statistical differences in the maximum applied force.}, language = {en} }