TY - GEN A1 - Rogge, Stephan A1 - Hentschel, Christian A1 - Amtsfeld, Philipp A1 - Bestle, Dieter A1 - Meyer, Marcus A1 - Edwards, Paul T1 - Interactive Blade Modification in Para View Connected to Rapid GPU Flow Simulation N2 - 9th Automatic Design and Optimisation Seminar (ADOS 2011), 28.09.-29.09.2011, Derby KW - Simulation Y1 - 2011 N1 - Poster ER - TY - RPRT A1 - Knippschild, Robert A1 - Meyer, Monika A1 - Roters, Jan A1 - Huttenloher, Christian A1 - Artmann, Judith T1 - Zukünftige Strategien der Europäischen Raumentwicklungspolitik. Endbericht. Dresden und Berlin. Y1 - 2011 ER - TY - CHAP A1 - Meyer, Marcus A1 - Swoboda, Marius A1 - Rogge, Stephan A1 - Amtsfeld, Philipp A1 - Hentschel, Christian A1 - Bestle, Dieter T1 - Interactive Aerodynamic Design in a Virtual Environment T2 - HPCN-Workshop 2012, Braunschweig am 9./10. Mai 2012 Y1 - 2012 UR - http://www.t-systems-sfr.com/e/deu/download.php ER - TY - CHAP A1 - Rogge, Stephan A1 - Amtsfeld, Philipp A1 - Hentschel, Christian A1 - Bestle, Dieter A1 - Meyer, Marcus T1 - Using gestures to interactively modify turbine blades in a Virtual Environment T2 - Emerging Signal Processing Applications (ESPA), 2012 IEEE International Conference, Las Vegas, 12 - 14 Jan. 2012 KW - GPU-accelerated computational fluid dynamics KW - blade geometry;cumbersome input hardware KW - expensive input hardware KW - fluid flow KW - gesture-based interaction KW - interactively modify turbine blades KW - special interaction;virtual environments KW - blades;computational fluid dynamics KW - gesture recognition KW - graphics processing units KW - turbines Y1 - 2012 SN - 978-1-4673-0899-1 SP - 155 EP - 158 PB - IEEE ER - TY - CHAP A1 - Lockan, Michael A1 - Bestle, Dieter A1 - Janke, Christian A1 - Meyer, Marcus T1 - Optimization of Coupled System Components Using Approximations of Interface Quantities T2 - ASME Turbo Expo 2017, Turbomachinery Conference and Exposition, Volume 2C, Turbomachinery Charlotte, North Carolina, USA, June 26-30, 2017 KW - Optimization KW - Approximation Y1 - 2017 SN - 978-0-7918-5080-0 U6 - https://doi.org/10.1115/GT2017-64135 N1 - GT2017-64135 PB - ASME CY - New York, NY ER - TY - GEN A1 - Herzog, Roland A1 - Meyer, Christian A1 - Wachsmuth, Gerd T1 - B- and Strong Stationarity for Optimal Control of Static Plasticity with Hardening T2 - SIAM Journal on Optimization N2 - Optimal control problems for the variational inequality of static elastoplasticity with linear kinematic hardening are considered. The control-to-state map is shown to be weakly directionally differentiable, and local optimal controls are proved to verify an optimality system of B-stationary type. For a modified problem, local minimizers are shown to even satisfy an optimality system of strongly stationary type. KW - mathematical programs with complementarity constraints in function space KW - variational inequalities of first kind KW - elastoplasticity KW - Bouligand and strong stationarity Y1 - 2013 U6 - https://doi.org/10.1137/110821147 SN - 1052-6234 SN - 1095-7189 VL - 23 IS - 1 SP - 321 EP - 352 ER - TY - GEN A1 - Herzog, Roland A1 - Meyer, Christian A1 - Wachsmuth, Gerd T1 - C-Stationarity for Optimal Control of Static Plasticity with Linear Kinematic Hardening T2 - SIAM Journal on Optimization N2 - An optimal control problem is considered for the variational inequality representing the stress-based (dual) formulation of static elastoplasticity. The linear kinematic hardening model and the von Mises yield condition are used. Existence and uniqueness of the plastic multiplier is rigorously proved, which allows for the reformulation of the forward system using a complementarity condition. In order to derive necessary optimality conditions, a family of regularized optimal control problems is analyzed, wherein the static plasticity problems are replaced by their viscoplastic approximations. By passing to the limit in the optimality conditions for the regularized problems, necessary optimality conditions of C-stationarity type are obtained. KW - mathematical programs with complementarity constraints KW - static plasticity KW - optimal control KW - optimality conditions Y1 - 2012 U6 - https://doi.org/10.1137/100809325 SN - 0363-0129 SN - 1095-7138 VL - 50 IS - 5 SP - 3052 EP - 3082 ER - TY - GEN A1 - Herzog, Roland A1 - Meyer, Christian A1 - Wachsmuth, Gerd T1 - Integrability of displacement and stresses in linear and nonlinear elasticity with mixed boundary conditions T2 - Journal of Mathematical Analysis and Applications N2 - Equations of linear and nonlinear infinitesimal elasticity with mixed boundary conditionsare considered. The bounded domain is assumed to have a Lipschitz boundary and to satisfy additional regularity assumptions. W^(1,p) regularity for the displacements and L^p regularity for the stresses are proved for some p>2. KW - Nonlinear elasticity KW - Integrability KW - Mixed boundary conditions KW - Discontinuous coefficients Y1 - 2011 U6 - https://doi.org/10.1016/j.jmaa.2011.04.074 SN - 0022-247X VL - 382 IS - 2 SP - 802 EP - 813 ER - TY - GEN A1 - Mahmoodinezhad, Ali A1 - Morales, Carlos A1 - Naumann, Franziska A1 - Plate, Paul A1 - Meyer, Robert A1 - Janowitz, Christoph A1 - Henkel, Karsten A1 - Kot, Małgorzata A1 - Zöllner, Marvin Hartwig A1 - Wenger, Christian A1 - Flege, Jan Ingo T1 - Low-temperature atomic layer deposition of indium oxide thin films using trimethylindium and oxygen plasma T2 - Journal of Vacuum Science and Technology A N2 - Indium oxide (InxOy) thin films were deposited by plasma-enhanced atomic layer deposition (PEALD) using trimethylindium and oxygen plasma in a low-temperature range of 80–200 °C. The optical properties, chemical composition, crystallographic structure, and electrical characteristics of these layers were investigated by spectroscopic ellipsometry (SE), x-ray photoelectron spectroscopy (XPS), x-ray diffraction (XRD), as well as current-voltage and capacitance-voltage measurements. The SE results yielded a nearly constant growth rate of 0.56 Å per cycle and a thickness inhomogeneity of ≤1.2% across 4-in. substrates in the temperature range of 100–150 °C. The refractive index (at 632.8 nm) was found to be 2.07 for the films deposited at 150 °C. The PEALD-InxOy layers exhibit a direct (3.3 ± 0.2 eV) and an indirect (2.8 ± 0.1 eV) bandgap with an uptrend for both with increasing substrate temperature. Based on XPS characterization, all InxOy samples are free of carbon impurities and show a temperature-dependent off-stoichiometry indicating oxygen vacancies. XRD diffraction patterns demonstrate an onset of crystallization at 150 °C. Consistent with the optical, XPS, and XRD data, the films deposited at ≥150 °C possess higher electrical conductivity. Our findings prove that a low-temperature PEALD process of InxOy is feasible and promising for a high-quality thin-film deposition without chemical impurities on thermally fragile substrates. KW - Indium oxide KW - Plasma-enhanced atomic layer deposition KW - X-ray photoelectron spectroscopy KW - Ellipsometry KW - X-ray diffraction KW - Electrical properties Y1 - 2021 U6 - https://doi.org/10.1116/6.0001375 SN - 0734-2101 SN - 1520-8559 VL - 39 IS - 6 ER - TY - CHAP A1 - Herzog, Roland A1 - Meyer, Christian A1 - Wachsmuth, Gerd ED - Leugering, Günter T1 - Optimal Control of Elastoplastic Processes: Analysis, Algorithms, Numerical Analysis and Applications T2 - Trends in PDE Constrained Optimization N2 - An optimal control problem is considered for the variational inequality representing the stress-based (dual) formulation of static elastoplasticity. The linear kinematic hardening model and the von Mises yield condition are used. The forward system is reformulated such that it involves the plastic multiplier and a complementarity condition. In order to derive necessary optimality conditions, a family of regularized optimal control problems is analyzed. C-stationarity type conditions are obtained by passing to the limit with the regularization. Numerical results are presented. KW - Mathematical programs with complementarity constraints in function space KW - Variational inequalities KW - Elastoplasticity KW - Regularization KW - Optimality conditions Y1 - 2014 SN - 978-3-319-05082-9 SN - 978-3-319-38114-5 SN - 978-3-319-05083-6 U6 - https://doi.org/10.1007/978-3-319-05083-6_4 SP - 27 EP - 41 PB - Birkhäuser CY - Cham ET - 1. Auflage ER - TY - GEN A1 - Herzog, Roland A1 - Meyer, Christian A1 - Wachsmuth, Gerd T1 - Existence and regularity of the plastic multiplier in static and quasistatic plasticity T2 - GAMM-Mitteilungen N2 - Existence of the plastic multiplier with L1 spatial regularity for quasistatic and static plasticity is proved for arbitrary continuous and convex yield functions and linear hardening laws. L2 regularity is shown in the particular cases of kinematic hardening, or combined kinematic and isotropic hardening KW - Plastic Multiplier KW - Static Plasticity KW - Quasistatic Plasticity KW - Variational Inequalities Y1 - 2011 U6 - https://doi.org/10.1002/gamm.201110006 SN - 1522-2608 VL - 34 IS - 1 SP - 39 EP - 44 ER - TY - GEN A1 - Meyer, Werner A1 - Borislavov, Borislav A1 - Eckert, Friedrich A1 - Richter, Christian A1 - Römer, Ronald A1 - Beim Graben, Peter A1 - Huber, Markus A1 - Wolff, Matthias ED - Hillmann, Stefan ED - Weiss, Benjamin ED - Michael, Thilo ED - Möller, Sebastian T1 - Formalisierung und Implementierung einer adaptiven kognitiven Architektur unter Verwendung von Strukturdiagrammen T2 - Elektronische Sprachsignalverarbeitung 2021 : Tagungsband der 32. Konferenz Berlin, 3.-5. März 2021 N2 - Das Fachgebiet der Kognitiven Technischen Systeme zeichnet sich durch einen hohen Grad an Interdisziplinarität (z. B. Kenntnisse auf den Gebieten Biologie, Psychologie, Informatik und den Ingenieurwissenschaften) aus. Nach wie vor besteht Bedarf an einer methodischen Darstellung des Fachgebietes, bei der die theoretische Durchdringung von Zusammenhängen zwischen den verschiedenen Wissensgebieten zusätzlich durch Anschaulichkeit unterstützt wird. Die vorliegende Arbeit stellt einen Fortschrittsbericht zur Realisierung eines Forschungs- und Experimentiersystems dar, mit dem wir dieses Anliegen unterstützen und über das wir erstmals konzeptionell in [1] berichtet haben. In diesem Beitrag folgen wir einem integrativen Ansatz zur Entwicklung einer kognitiven Architektur, mit der unter Verwendung repräsentationaler Datenstrukturen adaptives Verhalten auf verschiedenen Zeitskalen sowie zwei wichtige Verhaltensprogramme für das Problemlösen (Objektfindung, Exploration) auf der gemeinsamen Grundlage von Markov-Entscheidungsprozessen umgesetzt werden. Mit einem Kurzbericht zum Entwicklungsstand der physikalischen Experimentierumgebung und einer Zusammenfassung der bislang erreichten Ergebnisse beschließen wir den diesjährigen Beitrag. Y1 - 2021 UR - https://www.essv.de/?year=2021 SN - 978-3-959082-27-3 SN - 0940-6832 SP - 67 EP - 76 PB - TUDpress CY - Dresden ER - TY - GEN A1 - Sousa, João A1 - Nazarenko, Artem A. A1 - Grunewald, Christian A1 - Psarommatis, Foivos A1 - Fraile, Francisco A1 - Meyer, Olga A1 - Sarraipa, João T1 - Zero-defect manufacturing terminology standardization: Definition, improvement, and harmonization T2 - Frontiers in Manufacturing Technology N2 - Zero-Defect Manufacturing (ZDM) is the next evolutionary step in quality management for manufacturing that makes use of Industry 4.0 technologies to support quality in manufacturing. These technologies help reduce the cost of inspection, allowing for more inspection points throughout the manufacturing process, reducing the size of quality feedback loops, and guaranteeing that no defective product is delivered to the customer. There are several ZDM-related initiatives, but still no harmonized terminology. This article describes the methodological approach to provide a common agreement on the ZDM concept and its associated terminology taking place within an open CEN-CENELEC Workshop. The methodology has the support of ISO standards for terminology work such as ISO 704, ISO 860, and ISO 10241–1/2. This work shows that the terminology for ZDM has a significant overlap with the terminology of quality management, metrology, dependability, statistics, non-destructive inspection, and condition monitoring. The proposed new terms and definitions can be used to further extend ISO’s and IEC’s already available terminologies and support present and future researchers in the field to conduct their research using a common vocabulary. KW - zero-defect manufacturing (ZDM) KW - terminology KW - industrie 4.0 KW - quality management system KW - inspection Y1 - 2022 U6 - https://doi.org/10.3389/fmtec.2022.947474 SN - 2813-0359 VL - 2 ER - TY - GEN A1 - Meyer, Bernd A1 - Keller, Florian A1 - Wolfersdorf, Christian A1 - Lee, Roh Pin T1 - Ein Konzept für die Kohlenstoffkreislaufwirtschaft : Sektorkopplung zwischen Energie, Chemie & Abfall T2 - Chemie Ingenieur Technik N2 - Ein Konzept zur CO2‐emissionsfreien Schließung des Kohlenstoffkreislaufes durch Kopplung von CO2‐emissionsamer Kohlechemie, Abfallwirtschaft und Energiewirtschaft mithilfe der Co‐Vergasung von Kohle und Abfall unter Einbindung von regenerativ erzeugtem Wasserstoff wird vorgestellt. Ziel ist die Erreichung der CO2‐Emissionsfreiheit durch Einkopplung Erneuerbarer Energie. Am Beispiel der Olefinproduktion in Deutschland wird der dafür erforderliche Bedarf ermittelt. Im Vergleich zeichnet sich die Vergasungsroute durch einen um etwa Faktor zwei geringeren Energiebedarf aus. KW - Industrial and Manufacturing Engineering KW - General Chemical Engineering KW - General Chemistry Y1 - 2018 U6 - https://doi.org/10.1002/cite.201700088 SN - 0009-286X VL - 90 IS - 1-2 SP - 241 EP - 248 ER - TY - GEN A1 - Lee, Roh Pin A1 - Wolfersdorf, Christian A1 - Keller, Florian A1 - Meyer, Bernd T1 - Towards a closed carbon cycle and achieving a circular economy for carbonaceous resources : Net zero emissions, resource efficiency and resource conservation through coupling of the energy, chemical and recycling sectors T2 - Erdöl, Erdgas, Kohle N2 - Lignite and carbonaceous waste are valuable primary and secondary carbon carriers. The projected increased reduction in lignite for electricity production in Germany, the need to increase carbonaceous waste recycling as well as the anticipated availability of renewable electricity from Germany's energy transition all point to a high potential for closing the carbon cycle (C³) for the nation's carbon intensive industries. In this article, we present a concept for achieving net zero emissions, resource efficiency and conservation by coupling the energy, chemical and recycling sectors to support a circular carbon economy. To illustrate our concept, results from process model evaluations of domestic carbon feedstock (i.e. plastic waste and lignite) for olefins production in Germany are presented. KW - circular economy KW - carbon cycle Y1 - 2017 U6 - https://doi.org/10.19225/170603 SN - 0179-3187 VL - 6 SP - 76 EP - 80 ER - TY - CHAP A1 - Lee, Roh Pin A1 - Laugwitz, Alexander A1 - Keller, Florian A1 - Wolfersdorf, Christian A1 - Mehlhose, Friedemann A1 - Meyer, Bernd ED - Thomé-Kozmiensky, Karl J. ED - Thiel, Stephanie ED - Thomé-Kozmiensky, Elisabeth ED - Winter, Franz ED - Juchelková, Dagmar T1 - Achieving a Closed Carbon & Circular Economy for the Waste Management Sector – Net Zero Emissions, Resource Efficiency and Conservation by Coupling the Energy, Chemical and Recycling Sectors T2 - Waste Management, Volume 7 – Waste-to-Energy KW - Waste Management KW - Circular Economy KW - Net Zero Y1 - 2017 SN - 978-3-944310-37-4 SP - 343 EP - 354 PB - TK Verlag Karl Thomé-Kozmiensky CY - Nietwerder ER - TY - GEN A1 - Berger, Uta A1 - Bell, Andrew A1 - Barton, C. Michael A1 - Chappin, Emile A1 - Dreßler, Gunnar A1 - Filatova, Tatiana A1 - Fronville, Thibault A1 - Lee, Allen A1 - Loon, Emiel van A1 - Lorscheid, Iris A1 - Meyer, Matthias A1 - Müller, Birgit A1 - Piou, Cyril A1 - Radchuk, Viktoriia A1 - Roxburgh, Nicholas A1 - Schüler, Lennart A1 - Troost, Christian A1 - Wijermans, Nanda A1 - Williams, Tim G. A1 - Wimmler, Marie-Christin A1 - Grimm, Volker T1 - Towards reusable building blocks for agent-based modelling and theory development T2 - Environmental Modelling & Software Y1 - 2024 U6 - https://doi.org/10.1016/j.envsoft.2024.106003 SN - 1364-8152 VL - 175 PB - Elsevier BV ER - TY - GEN A1 - Herglotz, Christian A1 - Och, Hannah A1 - Meyer, Anna A1 - Ramasubbu, Geetha A1 - Eichermüller, Lena A1 - Kränzler, Matthias A1 - Brand, Fabian A1 - Fischer, Kristian A1 - Nguyen, Dat Thanh A1 - Regensky, Andy A1 - Kaup, André T1 - The Bjøntegaard Bible Why Your Way of Comparing Video Codecs May Be Wrong T2 - IEEE Transactions on Image Processing N2 - In this paper, we provide an in-depth assessment on the Bjøntegaard Delta. We construct a large data set of video compression performance comparisons using a diverse set of metrics including PSNR, VMAF, bitrate, and processing energies. These metrics are evaluated for visual data types such as classic perspective video, 360° video, point clouds, and screen content. As compression technology, we consider multiple hybrid video codecs as well as state-of-the-art neural network based compression methods. Using additional supporting points in-between standard points defined by parameters such as the quantization parameter, we assess the interpolation error of the Bjøntegaard-Delta (BD) calculus and its impact on the final BD value. From the analysis, we find that the BD calculus is most accurate in the standard application of rate-distortion comparisons with mean errors below 0.5 percentage points. For other applications and special cases, e.g., VMAF quality, energy considerations, or inter-codec comparisons, the errors are higher (up to 5 percentage points), but can be halved by using a higher number of supporting points. We finally come up with recommendations on how to use the BD calculus such that the validity of the resulting BD-values is maximized. Main recommendations are as follows: First, relative curve differences should be plotted and analyzed. Second, the logarithmic domain should be used for saturating metrics such as SSIM and VMAF. Third, BD values below a certain threshold indicated by the subset error should not be used to draw recommendations. Fourth, using two supporting points is sufficient to obtain rough performance estimates. KW - Measurement KW - Calculus KW - Codecs KW - Interpolation KW - Image coding KW - Distortion KW - Visualization Y1 - 2024 U6 - https://doi.org/10.1109/TIP.2023.3346695 SN - 1057-7149 SN - 1941-0042 IS - Volume 33 SP - 987 EP - 1001 ER - TY - GEN A1 - Meyer, Christian A1 - Wachsmuth, Gerd T1 - Optimal control of the Poisson equation with transport regularization : properties of optimal transport plans and transport map T2 - arXiv N2 - An optimal control problem in the space of Borel measures governed by the Poisson equation is investigated. The characteristic feature of the problem under consideration is the Tikhonov regularization term in form of the transportation distance of the control to a given prior. Existence of optimal solutions is shown and first-order necessary optimality conditions are derived. The latter are used to deduce structural a priori information about the optimal control and its support based on properties of the associated optimal transport plan. KW - Optimal control of PDEs KW - Measure control KW - Optimal transport regularization KW - First-order necessary optimality conditions Y1 - 2025 U6 - https://doi.org/10.48550/arXiv.2506.02808 SP - 1 EP - 37 PB - arXiv ER -