@inproceedings{GroteSchulzeDarupReinig2009, author = {Grote, Wolfgang and Schulze Darup, M. and Reinig, G.}, title = {Modellpr{\"a}diktive Regelung von Entnahmeturbinen und Dampfnetzen (Poster)}, series = {Chemie Ingenieur Technik}, volume = {2009}, booktitle = {Chemie Ingenieur Technik}, number = {8}, publisher = {Wiley}, address = {Weinheim}, doi = {10.1002/cite.200950184}, pages = {1113 -- 1114}, year = {2009}, language = {de} } @inproceedings{GroteReinig2009, author = {Grote, Wolfgang and Reinig, Gunter}, title = {Modellbasierte Regelung von Entnahmedampfturbinen (eingeladener Vortrag)}, series = {43. Regelungstechnisches Kolloquium in Boppard vom 25.-27. Februar 2009}, booktitle = {43. Regelungstechnisches Kolloquium in Boppard vom 25.-27. Februar 2009}, year = {2009}, language = {de} } @inproceedings{GroteKastsianMoennigmann2011, author = {Grote, Wolfgang and Kastsian, Darya and M{\"o}nnigmann, Martin}, title = {Optimal power system unit commitment with guaranteed local stability}, series = {Proceedings of the 2011 American Control Conference}, booktitle = {Proceedings of the 2011 American Control Conference}, publisher = {IEEE}, issn = {2378-5861}, doi = {10.1109/ACC.2011.5991058}, pages = {4526 -- 4531}, year = {2011}, abstract = {This article deals with the cost optimal commitment of power systems. System stability is often only considered after solving the commitment problem. We show by example that a cost optimization may result in a mode of operation that, while economically optimal, is unstable or has otherwise unacceptable dynamics. As a remedy, we propose to use the so-called normal vector method, which has been developed for the optimization of nonlinear dynamical systems with stability boundaries and uncertain parameters. We apply the method to a small sample power grid, where the optimization goal is to minimize the energy production costs for a given power consumption.}, language = {en} } @inproceedings{NielsenLeithnerQietal.2011, author = {Nielsen, L. and Leithner, R. and Qi, D. and Grote, Wolfgang and Kastsian, Darya and M{\"o}nnigmann, Martin}, title = {Isobares GuD - Druckluftspeicherkraftwerk mit W{\"a}rmespeicher}, series = {Energy Storage Conference and Exhibition (IRES 2011), Berlin. 2011}, booktitle = {Energy Storage Conference and Exhibition (IRES 2011), Berlin. 2011}, address = {Berlin}, year = {2011}, language = {de} } @article{GroteKastsianMoennigmann2013, author = {Grote, Wolfgang and Kastsian, Darya and M{\"o}nnigmann, Martin}, title = {Guaranteed stability in optimal power generation dispatching under uncertainty}, series = {IEEE Transactions on Power Systems}, volume = {28}, journal = {IEEE Transactions on Power Systems}, number = {2}, publisher = {IEEE}, issn = {1558-0679}, doi = {10.1109/TPWRS.2012.2207970}, pages = {1103 -- 1112}, year = {2013}, abstract = {Stability and cost optimality of power generation and supply systems must not be considered independently from one another. Simple examples show that optimizing cost without considering stability may result in modes of operation that, while economically optimal, are unstable. We demonstrate that stability, robustness, and optimality can be considered systematically and simultaneously by combining bifurcation theory and nonlinear optimization. Essentially, the proposed method enforces a backoff distance between the optimal point of operation and operational or stability boundaries in the space of the optimization variables, where bifurcation theory is used to describe nonlinear stability boundaries.}, language = {en} } @article{JostGroteMoellenbrucketal.2014, author = {Jost, Michael and Grote, Wolfgang and M{\"o}llenbruck, Florian and M{\"o}nnigmann, Martin}, title = {Plant-wide control of a parabolic trough power plant with thermal energy storage}, series = {IFAC Proceedings Volumes}, volume = {47}, journal = {IFAC Proceedings Volumes}, number = {3}, publisher = {Elsevier}, issn = {2589-3653}, doi = {10.3182/20140824-6-ZA-1003.00879}, pages = {419 -- 425}, year = {2014}, abstract = {We present a control scheme for a parabolic trough power plant that is equipped with a molten salt thermal energy storage system. We show that the multivariable control problem for the solar field can be decoupled by controlling the three way valve that splits the heat transfer fluid between the storage system and the steam generator. The steam generation cycle is regulated with inlet pressure control. The subsystems of the plant are modeled based on first principles, where we focus on the steam generation cycle. A multi-group extraction turbine with pre- and reheater is considered, which is suitable for solar power plants. We demonstrate the benefits of the proposed control scheme with a day-to-day simulation.}, language = {en} } @article{MierMoellenbruckJostetal.2015, author = {Mier, Dominik and M{\"o}llenbruck, Florian and Jost, Michael and Grote, Wolfgang and M{\"o}nnigmann, Martin}, title = {Model predictive control of the steam cycle in a solar power plant}, series = {IFAC-PapersOnLine}, volume = {48}, journal = {IFAC-PapersOnLine}, number = {8}, publisher = {Elsevier}, issn = {2405-8963}, doi = {10.1016/j.ifacol.2015.09.052}, pages = {710 -- 715}, year = {2015}, abstract = {We derive a nonlinear model of the steam cycle of a solar power plant, estimate its unknown parameters with measured data, and design a linear model predictive controller based on the resulting model. Simulations show that the linear model predictive controller is able to regulate the electrical power of the nonlinear steam process of the plant to a given reference trajectory very well. Moreover, it results in very good disturbance rejection.}, language = {en} } @inproceedings{SchrammKrugerNiemannetal.2019, author = {Schramm, Alexander and Kruger, Karl and Niemann, J{\"o}rg and Grote, Wolfgang}, title = {Possibilities, Limitations and Considerations for Eye Tracking in Industrial Environments: Experience from a Case Study}, series = {International Conference on Competitive Manufacturing (COMA 19) proceedings : 30 January 2019-1 February 2019, Stellenbosch, South Africa}, booktitle = {International Conference on Competitive Manufacturing (COMA 19) proceedings : 30 January 2019-1 February 2019, Stellenbosch, South Africa}, editor = {Dimitrov, Dimiter and Hagedorn-Hansen, Devon and Leipzig, Karl von}, publisher = {Department of Industrial Engineering, Stellenbosch University}, address = {Stellenbosch}, isbn = {978-0-7972-1779-9}, pages = {390 -- 396}, year = {2019}, abstract = {Eye tracking is a measurement technique for determining the orientation and viewing direction of an individual's eyes. It allows for an evaluation of the individual's gaze and other related information.There is a wide variety of application areas for eye tracking, however the usage in engineeringindustry is still limited. This paper presents a case study for the use of eye tracking in a testingstation for electrical circuit breakers. The case study aims to evaluate the measurement and analysispossible with the Tobii wearable eye tracking system. From the case study, possibilities, limitationsand considerations for eye tracking in industrial settings are identified and discussed. The paperconcludes that while eye tracking can be used to effectively capture and visualize insightfulinformation, it faces major challenges related to subjectivity in analysis and labour intensiveness.}, language = {en} } @inproceedings{BeckersPawlikKieletal.2019, author = {Beckers, Sebastian and Pawlik, Julian and Kiel, J{\"u}rgen and Grote, Wolfgang}, title = {Simulation von Partikelflugbahnen zur Auslegungshilfe von elektrostatischen Luftfiltern}, publisher = {ARGESIM, ASIM}, address = {Wien}, isbn = {978-3-901608-06-3}, doi = {10.11128/arep.57}, pages = {147 -- 152}, year = {2019}, language = {de} } @inproceedings{GroteRammSchoenig2022, author = {Grote-Ramm, Wolfgang and Sch{\"o}nig, Felix}, title = {Model Predictive Control of Solar Receivers}, series = {25th Cologne Solar Colloquium (DLR)}, booktitle = {25th Cologne Solar Colloquium (DLR)}, pages = {17}, year = {2022}, language = {en} } @article{GroteRammLanuschnyLorenzenetal.2023, author = {Grote-Ramm, Wolfgang and Lanuschny, David and Lorenzen, Finn and Oliveira Brito, Marcel and Sch{\"o}nig, Felix}, title = {Continual learning for neural regression networks to cope with concept drift in industrial processes using convex optimisation}, series = {Engineering Applications of Artificial Intelligence}, volume = {120}, journal = {Engineering Applications of Artificial Intelligence}, publisher = {Elsevier}, address = {New York}, issn = {1873-6769}, doi = {10.1016/j.engappai.2023.105927}, pages = {10}, year = {2023}, abstract = {Process models in industrial applications, e.g. predictive maintenance or automation, are subject to both divergence from the underlying system due to their time-variant nature and to high complexity resulting from a wide operational range being covered. Hence, regression models require high accuracy for the present system state and at the same time need to be valid across the whole system operating space. While accuracy for the current system state can be gained by updating the model on the current data, the overall validity must often be retrieved from historical or design data. We propose a method to find an appropriate compromise for these two demands. A pre-trained artificial neural network (ANN) is continually updated on the current sensor data stream using convex optimisation. Thus, a unique and optimal solution is generated in each update step, while robust regression accuracy on the domain that is not covered by the arriving data subset is maintained. This is achieved by introducing a data management system to provide some historical data, constraining the optimisation problem and manipulating the architecture of the ANN. Models updated with this method show reasonable stability but display plastic behaviour at the current operating point.}, language = {en} } @inproceedings{LorenzenSchoenigGroteRammetal.2023, author = {Lorenzen, Finn and Sch{\"o}nig, Felix and Grote-Ramm, Wolfgang and Oliveira Brito, Marcel and Neuberger, Heiko and Sobolyev, Alexander}, title = {Continual Adaptation of Compressor Maps During Operation on Measurement Data For Increased Performance of Model-Based Applications in Turbomachinery}, series = {ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition, June 26-30, 2023 Boston, Massachusetts, USA}, volume = {Volume 4}, booktitle = {ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition, June 26-30, 2023 Boston, Massachusetts, USA}, publisher = {ASME}, address = {Boston}, isbn = {978-0-7918-8697-7}, doi = {10.1115/GT2023-103458}, pages = {1 -- 7}, year = {2023}, abstract = {Higher control engineering concepts, including artificial intelligence and model-based control, are recently becoming more popular in complex industrial applications because they enable a significant increase in efficiency. E.g., a model-based approach can be used to enhance the control and monitoring of several coupled components of a larger turbomachinery train. This requires dynamic models of the components, including all machine characteristics, which may experience a shift in their behavior over the course of their lifetime. Such changes occur due to natural fouling, wear of sub-components or external effects induced by maintenance measures. To overcome this problem, we model machine-characteristic maps with artificial neural networks, which may be used as part of prediction models in a model predictive control unit. If an appropriate data set is available, this allows us to adapt the model to the current behavior of the machine without requiring in-depth knowledge about the underlying physics of this "concept drift", as it is known in literature. However, the training of neural networks is usually connected with high computational effort while the task needs to be executed in real-time during operation. Furthermore, in real operating conditions, machine sensors can only provide labeled data from the current operating point of the machine, which can be stationary for long operation periods of up to several months. In general, this yields only an unrepresentative data subset of the machine-characteristics, which is not sufficient to retrain the whole model to a new state. To solve these problems, we firstly reduce the model adaptation to a convex optimization problem, which can be efficiently solved in real-time conditions. Secondly, we use a specialized data management system with which we can integrate historical data to supplement the unrepresentative data subset. In this paper we show the application of the outlined method on a compressor map and discuss the advantages and requirements of the method in the context of modeling applications for industrial turbomachinery.}, language = {en} } @misc{Pauli2022, type = {Master Thesis}, author = {Pauli, Dominik}, title = {Gefl{\"u}chtete Personen mit aufenthaltsrechtlicher Unsicherheit in der Berufsausbildung. Eine empirische Analyse f{\"o}rderlicher und erschwerender Bedingungen}, address = {D{\"u}sseldorf}, organization = {Hochschule D{\"u}sseldorf}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-41444}, school = {Hochschule D{\"u}sseldorf}, pages = {160}, year = {2022}, language = {de} } @misc{Musall2024, author = {Musall, Eike}, title = {Suffizienz als Ausweg?!}, series = {Klimafreundlich bauen, 2024: Magazin f{\"u}r Passivhaus \& Co}, volume = {19}, journal = {Klimafreundlich bauen, 2024: Magazin f{\"u}r Passivhaus \& Co}, number = {2024}, editor = {Laible, Johannes}, publisher = {Laible Verlagsprojekte}, isbn = {978-3-944549-51-4}, pages = {30 -- 33}, year = {2024}, language = {de} } @article{MolloyMuellerDeeganetal.2024, author = {Molloy, Dara and M{\"u}ller, Patrick and Deegan, Brian and Mullins, Darragh and Horgan, Jonathan and Ward, Enda and Jones, Edward and Braun, Alexander and Glavin, Martin}, title = {Analysis of the Impact of Lens Blur on Safety-Critical Automotive Object Detection}, series = {IEEE Access}, volume = {12}, journal = {IEEE Access}, publisher = {IEEE}, issn = {2169-3536}, doi = {10.1109/ACCESS.2023.3348663}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-42999}, pages = {3554 -- 3569}, year = {2024}, abstract = {Camera-based object detection is widely used in safety-critical applications such as advanced driver assistance systems (ADAS) and autonomous vehicle research. Road infrastructure has been designed for human vision, so computer vision, with RGB cameras, is a vital source of semantic information from the environment. Sensors, such as LIDAR and RADAR, are also often utilized for these applications; however, cameras provide a higher spatial resolution and color information. The spatial frequency response (SFR), or sharpness of a camera, utilized in object detection systems must be sufficient to allow a detection algorithm to localize objects in the environment over its lifetime reliably. This study explores the relationship between object detection performance and SFR. Six state-of-the-art object detection models are evaluated with varying levels of lens defocus. A novel raw image dataset is created and utilized, containing pedestrians and cars over a range of distances up to 100-m from the sensor. Object detection performance for each defocused dataset is analyzed over a range of distances to determine the minimum SFR necessary in each case. Results show that the relationship between object detection performance and lens blur is much more complex than previous studies have found due to lens field curvature, chromatic aberration, and astigmatisms. We have found that smaller objects are disproportionately impacted by lens blur, and different object detection models have differing levels of robustness to lens blur}, language = {en} } @techreport{RehmLoschenLetzner2024, author = {Rehm, Lukas and Loschen, Rebekka and Letzner, Sara}, title = {Publikationen in der Forschungsevaluation - Eine Handreichung f{\"u}r Wissenschaftsmanager*innen}, publisher = {Zenodo}, doi = {10.5281/zenodo.10474261}, year = {2024}, abstract = {Sollen Forschungsleistungen gemessen und bewertet werden, stellen Publikationen eines der wichtigsten Kriterien dar. Die Bibliometrie liefert eine Vielzahl von (absoluten, relativen, normalisierten) Indikatoren, die Wissenschaftsmanager*innen f{\"u}r Leistungstr{\"a}geranalysen oder Forschungsevaluationen heranziehen k{\"o}nnen. Um valide Aussagen {\"u}ber wissenschaftliche Leistungen vornehmen zu k{\"o}nnen, m{\"u}ssen bibliometrische Kennzahlen mit anderen Leistungskriterien in Bezug gesetzt werden und es sind viele Faktoren sowie Umst{\"a}nde zu ber{\"u}cksichtigen. Auf diese wird in der vorliegenden Handreichung eingegangen. Sie sollen Wissenschaftsmanager*innen das R{\"u}stzeug an die Hand geben, um bibliometrische Untersuchungen und deren Ergebnisse in dem jeweiligen Untersuchungsfall zielf{\"u}hrend einordnen zu k{\"o}nnen.}, language = {de} } @article{EnggruberLauber2024, author = {Enggruber, Ruth and Lauber, Dominique M.}, title = {Problembew{\"a}ltigung oder Erwerbsarbeit first?: W{\"u}nsche von B{\"u}rgergeldbezieher:innen mit Suchtverhalten an Unterst{\"u}tzungsangebote - empirische Einblicke}, series = {Soziale Passagen}, journal = {Soziale Passagen}, publisher = {Springer Nature}, issn = {1867-0199}, doi = {10.1007/s12592-023-00474-4}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-42953}, year = {2024}, abstract = {Menschen mit Suchtverhalten, die B{\"u}rgergeld nach dem Sozialgesetzbuch II beziehen, zu ihren W{\"u}nschen an f{\"u}r sie hilfreiche Unterst{\"u}tzungsangebote zu befragen und aus ihren Schilderungen herauszuarbeiten, welche Bedeutung f{\"u}r sie Erwerbarbeit hat, fordert die Forschenden zu kritischen Selbstvergewisserungen heraus.Denn die qualitative Studie, die im Rahmen eines Modellprojekts, gef{\"o}rdert vom Bundesarbeitsministerium, durchgef{\"u}hrt wurde, ber{\"u}hrt vier kritische Fachdebatten in der Sozialen Arbeit. Neben der (1) sozialpolitischen Aktivierungsprogrammatik sind hier v. a. die (2) Bezeichnung von Menschen mit Suchtverhalten sowie (3) methodologische Einw{\"a}nde gegen subjektorientierte Forschungsperspektiven und (4) Case Management bedeutsam. Nach der Positionierung in diesen Fachdebatten werden empirische Einblicke dazu gew{\"a}hrt, dass die Frage „Problembew{\"a}ltigung oder Erwerbsarbeit first?" differenziert beantwortet wird.Ferner {\"a}ußern die B{\"u}rgergeldbezieher:innen mit Suchtverhalten diverse W{\"u}nsche an die Unterst{\"u}tzung im Jobcenter und andere Hilfsangebote. Vor allem w{\"u}nschen sie sich vom Jobcenter, dass es dort nicht nur um die Vermittlung in Erwerbsarbeit gehen sollte, sondern weitere und damit hybride Zielsetzungen verfolgt werden sollten.}, language = {de} } @article{GeerkensSieberichsBraunetal.2024, author = {Geerkens, Simon and Sieberichs, Christian and Braun, Alexander and Waschulzik, Thomas}, title = {QI²: an interactive tool for data quality assurance}, series = {AI and Ethics}, volume = {4}, journal = {AI and Ethics}, publisher = {Springer Nature}, issn = {2730-5961}, doi = {10.1007/s43681-023-00390-6}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-42945}, pages = {141 -- 149}, year = {2024}, abstract = {The importance of high data quality is increasing with the growing impact and distribution of ML systems and big data. Also, the planned AI Act from the European commission defines challenging legal requirements for data quality especially for the market introduction of safety relevant ML systems. In this paper, we introduce a novel approach that supports the data quality assurance process of multiple data quality aspects. This approach enables the verification of quantitative data quality requirements. The concept and benefits are introduced and explained on small example data sets. How the method is applied is demonstrated on the well-known MNIST data set based an handwritten digits.}, language = {en} } @misc{Soehnitz2023, type = {Master Thesis}, author = {S{\"o}hnitz, Stefanie}, title = {Entwicklung eines prototypischen digitalen Workflows, der einen qualit{\"a}tsgesicherten Publikationsprozess auf Basis von definierten Qualit{\"a}tskriterien f{\"u}r Publikationen nachweist}, publisher = {Technische Hochschule Wildau}, address = {Wildau}, pages = {118}, year = {2023}, abstract = {Hintergrund: Durch die Digitalisierung hat sich die Art des Publizierens ver{\"a}ndert. Es ergeben sich neue Publikationswege und -formen. Eine Reflexion der traditionellen Ansichten {\"u}ber Publikationen und die Sicherung der Qualit{\"a}t ist erforderlich. Damit ergibt sich die Intension der Arbeit: Gegenw{\"a}rtige Qualit{\"a}tskriterien zu erfassen, zu analysieren und neuartige M{\"o}glichkeiten aufzuzeigen. Methoden: Die theoretische Basis f{\"u}r den Stand der Forschung erfolgt durch eine repr{\"a}sentative Literaturrecherche. Die Extraktion der Qualit{\"a}tskriterien basiert auf einer selektiven Quellenauswahl. Erg{\"a}nzend werden sechs Expert:innen anhand eines halbstrukturiertem Interviewleitfadens befragt. Die extrahierten Erkenntnisse aus der Analyse fließen in einen Wissensgraph und liefern Ans{\"a}tze f{\"u}r eine Qualit{\"a}tssicherung. Die Modellierung einer Anwendung wird auf Basis des Standards BPMN 2.0 umgesetzt. Ergebnisse: Es wird ein Qualit{\"a}tskriterien-Index erstellt, der zur Ausweisung von Qualit{\"a}tsmerkmalen f{\"u}r Publikationen f{\"u}hrt. Diese bilden die Wissensbasis f{\"u}r eine Web-Anwendung. Der darin enthaltene prototypische Workflow leitet die:den Autor:in durch Kriterien. Als Ergebnis werden die Publikationen mit Qualit{\"a}tsmerkmalen angereichert. Diese Arbeit liefert das theoretische Konzept f{\"u}r die Anwendung. Es beinhaltet ein Mockup und eine erste prototypische Umsetzung. Dies bietet die Basis f{\"u}r eine bedarfsorientierte, reale Entwicklung. Schlussfolgerungen: Eine reale, technische Umsetzung ist mit entsprechenden Ressourcen realisierbar. Vorab wird empfohlen, die ermittelten Qualit{\"a}tskriterien mit einer Nutzer:innengruppe zu reflektieren bspw. in Form einer qualitativen Erhebung. Diese liefert Hypothesen und f{\"o}rdert die Akzeptanz f{\"u}r die Ausweisung von Qualit{\"a}t. Das Ergebnis behandelt keine fachdisziplin-spezifischen Aspekte. Erfolgt dies, wird es zu einer Erweiterung der Anwendung f{\"u}hren. Ebenfalls sollte die Usability der Anwendung getestet werden, bevor die reale Umsetzung erfolgt. Das erstellte Konzept, ein Mockup und der Prototyp liefern die Ausgangslage f{\"u}r die Entwicklung.}, language = {de} } @article{SieberichsGeerkensBraunetal.2024, author = {Sieberichs, Christian and Geerkens, Simon and Braun, Alexander and Waschulzik, Thomas}, title = {ECS: an interactive tool for data quality assurance}, series = {AI and Ethics}, volume = {4}, journal = {AI and Ethics}, publisher = {Springer Nature}, issn = {2730-5961}, doi = {10.1007/s43681-023-00393-3}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-42908}, pages = {131 -- 139}, year = {2024}, abstract = {With the increasing capabilities of machine learning systems and their potential use in safety-critical systems, ensuring high-quality data is becoming increasingly important. In this paper, we present a novel approach for the assurance of data quality. For this purpose, the mathematical basics are first discussed and the approach is presented using multiple examples. This results in the detection of data points with potentially harmful properties for the use in safety-critical systems.}, language = {en} }