@inproceedings{MuellerSchmittLeiseetal.2021,
  author    = {M{\"u}ller, Tim M. and Schmitt, Andreas and Leise, Philipp and Meck, Tobias and Altherr, Lena and Pelz, Peter F. and Pfetsch, Marc E.},
  title     = {Validation of an optimized resilient water supply system},
  series = {Uncertainty in Mechanical Engineering},
  booktitle = {Uncertainty in Mechanical Engineering},
  publisher = {Springer},
  address   = {Cham},
  isbn      = {978-3-030-77255-0},
  doi       = {10.1007/978-3-030-77256-7_7},
  pages     = {70 -- 80},
  year      = {2021},
  abstract  = {Component failures within water supply systems can lead to significant performance losses. One way to address these losses is the explicit anticipation of failures within the design process. We consider a water supply system for high-rise buildings, where pump failures are the most likely failure scenarios. We explicitly consider these failures within an early design stage which leads to a more resilient system, i.e., a system which is able to operate under a predefined number of arbitrary pump failures. We use a mathematical optimization approach to compute such a resilient design. This is based on a multi-stage model for topology optimization, which can be described by a system of nonlinear inequalities and integrality constraints. Such a model has to be both computationally tractable and to represent the real-world system accurately. We therefore validate the algorithmic solutions using experiments on a scaled test rig for high-rise buildings. The test rig allows for an arbitrary connection of pumps to reproduce scaled versions of booster station designs for high-rise buildings. We experimentally verify the applicability of the presented optimization model and that the proposed resilience properties are also fulfilled in real systems.},
  language  = {en}
}
@incollection{LeiseAltherrSimonetal.2019,
  author    = {Leise, Philipp and Altherr, Lena and Simon, Nicolai and Pelz, Peter F.},
  title     = {Finding global-optimal gearbox designs for battery electric vehicles},
  series = {Optimization of complex systems - theory, models, algorithms and applications : WCGO 2019},
  booktitle = {Optimization of complex systems - theory, models, algorithms and applications : WCGO 2019},
  publisher = {Springer},
  address   = {Cham},
  isbn      = {978-3-030-21802-7},
  doi       = {10.1007/978-3-030-21803-4_91},
  pages     = {916 -- 925},
  year      = {2019},
  abstract  = {In order to maximize the possible travel distance of battery electric vehicles with one battery charge, it is mandatory to adjust all components of the powertrain carefully to each other. While current vehicle designs mostly simplify the powertrain rigorously and use an electric motor in combination with a gearbox with only one fixed transmission ratio, the use of multi-gear systems has great potential. First, a multi-speed system is able to improve the overall energy efficiency. Secondly, it is able to reduce the maximum momentum and therefore to reduce the maximum current provided by the traction battery, which results in a longer battery lifetime. In this paper, we present a systematic way to generate multi-gear gearbox designs that—combined with a certain electric motor—lead to the most efficient fulfillment of predefined load scenarios and are at the same time robust to uncertainties in the load. Therefore, we model the electric motor and the gearbox within a Mixed-Integer Nonlinear Program, and optimize the efficiency of the mechanical parts of the powertrain. By combining this mathematical optimization program with an unsupervised machine learning algorithm, we are able to derive global-optimal gearbox designs for practically relevant momentum and speed requirements.},
  language  = {en}
}
@incollection{StengerAltherrAbel2019,
  author    = {Stenger, David and Altherr, Lena and Abel, Dirk},
  title     = {Machine learning and metaheuristics for black-box optimization of product families: a case-study investigating solution quality vs. computational overhead},
  series = {Operations Research Proceedings 2018},
  booktitle = {Operations Research Proceedings 2018},
  publisher = {Springer},
  address   = {Cham},
  isbn      = {978-3-030-18499-5 (Print)},
  doi       = {10.1007/978-3-030-18500-8_47},
  pages     = {379 -- 385},
  year      = {2019},
  abstract  = {In product development, numerous design decisions have to be made. Multi-domain virtual prototyping provides a variety of tools to assess technical feasibility of design options, however often requires substantial computational effort for just a single evaluation. A special challenge is therefore the optimal design of product families, which consist of a group of products derived from a common platform. Finding an optimal platform configuration (stating what is shared and what is individually designed for each product) and an optimal design of all products simultaneously leads to a mixed-integer nonlinear black-box optimization model. We present an optimization approach based on metamodels and a metaheuristic. To increase computational efficiency and solution quality, we compare different types of Gaussian process regression metamodels adapted from the domain of machine learning, and combine them with a genetic algorithm. We illustrate our approach on the example of a product family of electrical drives, and investigate the trade-off between solution quality and computational overhead.},
  language  = {en}
}
@article{Olbertz2019,
  author    = {Olbertz, Klaus},
  title     = {Arbeitsrechtliche Akzente der Gesetzgebung und Rechtsprechung in 2018 : Ein kurzweiliger R{\"u}ckblick auf das Arbeitsrecht des vergangenen Jahres},
  series = {NWB - Steuer- und Wirtschaftsrecht},
  journal   = {NWB - Steuer- und Wirtschaftsrecht},
  number    = {5},
  issn      = {0028-3460},
  pages     = {266 -- 279},
  year      = {2019},
  language  = {de}
}
@article{Olbertz2019,
  author    = {Olbertz, Klaus},
  title     = {Auslandsentsendungen im arbeitsrechtlichen Zusammenhang : Ausgestaltung eines Entsendungsvertrags und mitbestimmungsrechtliche Aspekte},
  series = {NWB - Steuer- und Wirtschaftsrecht},
  journal   = {NWB - Steuer- und Wirtschaftsrecht},
  number    = {19},
  issn      = {0028-3460},
  pages     = {1400 -- 1406},
  year      = {2019},
  language  = {de}
}
@article{Olbertz2019,
  author    = {Olbertz, Klaus},
  title     = {Rechtssichere Vereinbarungen von K{\"u}ndigungsfristen im Arbeitsvertrag : Weitestgehende Abdingbarkeit gesetzlicher Vorgaben erm{\"o}glicht passgenaue Gestaltungen},
  series = {NWB - Steuer- und Wirtschaftsrecht},
  journal   = {NWB - Steuer- und Wirtschaftsrecht},
  number    = {23},
  issn      = {0028-3460},
  pages     = {1693 -- 1699},
  year      = {2019},
  language  = {de}
}
@article{Olbertz2019,
  author    = {Olbertz, Klaus},
  title     = {Die Optionen des Arbeitgebers nach Krankmeldung des Arbeitnehmers : Ein {\"U}berblick {\"u}ber die Rechte und Pflichten des Arbeitgebers bei Arbeitsunf{\"a}higkeit des Mitarbeiters},
  series = {NWB - Steuer- und Wirtschaftsrecht},
  journal   = {NWB - Steuer- und Wirtschaftsrecht},
  number    = {30},
  issn      = {0028-3460},
  pages     = {2222 -- 2229},
  year      = {2019},
  language  = {de}
}
@article{Olbertz2019,
  author    = {Olbertz, Klaus},
  title     = {Die arbeitsvertragliche Vereinbarung von Vertragsstrafen : Anforderungen an wirksame Vertragsstrafenabreden in Formulararbeitsvertr{\"a}gen beachten},
  series = {NWB - Steuer- und Wirtschaftsrecht},
  journal   = {NWB - Steuer- und Wirtschaftsrecht},
  number    = {45},
  issn      = {0028-3460},
  pages     = {3302 -- 3308},
  year      = {2019},
  language  = {de}
}
@article{Olbertz2020,
  author    = {Olbertz, Klaus},
  title     = {Jahresr{\"u}ckblick Arbeitsrecht 2019 : Gesetzes{\"a}nderungen und insbesondere im Zeichen des Befristungs- und Urlaubsrechts stehende h{\"o}chstrichterliche Rechtsprechung},
  series = {NWB - Steuer- und Wirtschaftsrecht},
  journal   = {NWB - Steuer- und Wirtschaftsrecht},
  number    = {8},
  publisher = {NWB-Verl.},
  address   = {Herne},
  issn      = {0028-3460},
  pages     = {557 -- 569},
  year      = {2020},
  abstract  = {In Fortschreibung des Jahresr{\"u}ckblicks 2018 (Olbertz, NWB 5/2019 S. 266 ) skizziert der vorliegende Beitrag die j{\"u}ngsten nennenswerten Entwicklungen im Arbeitsrecht des Jahres 2019. Im Bereich der Gesetzgebung, mit dem sich der erste Teil des Beitrags befasst, betrifft dies etwa das Fachkr{\"a}fteeinwanderungsgesetz, die angestoßenen Schutzvorschriften f{\"u}r Whistleblower oder das gesetzlich verankerte Recht auf Br{\"u}ckenteilzeit. In der arbeitsrechtlichen h{\"o}chstrichterlichen Rechtsprechung stand das Jahr 2019 insbesondere im Zeichen des Befristungs- und des Urlaubsrechts. Was hier und dar{\"u}ber hinaus wegweisend war, zeigt der zweite Teil des Beitrags.},
  language  = {de}
}
@article{Olbertz2020,
  author    = {Olbertz, Klaus},
  title     = {GmbH-Gesch{\"a}ftsf{\"u}hrer: das eine Mal Arbeitnehmer, das andere Mal nicht : Arbeits- und sozialrechtliche Anwendung von Schutzvorschriften auf den Gesch{\"a}ftsf{\"u}hrer von A bis Z},
  series = {NWB - Steuer- und Wirtschaftsrecht},
  journal   = {NWB - Steuer- und Wirtschaftsrecht},
  number    = {19},
  publisher = {NWB-Verl.},
  address   = {Herne},
  issn      = {0028-3460},
  pages     = {1431 -- 1441},
  year      = {2020},
  language  = {de}
}