TY  - CHAP
A1  - Müller, Tim M.
A1  - Schmitt, Andreas
A1  - Leise, Philipp
A1  - Meck, Tobias
A1  - Altherr, Lena
A1  - Pelz, Peter F.
A1  - Pfetsch, Marc E.
T1  - Validation of an optimized resilient water supply system
T2  - Uncertainty in Mechanical Engineering
N2  - 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.
KW  - Optimization
KW  - Mixed-integer nonlinear programming
KW  - Water distribution system
KW  - Resilience
KW  - Validation
Y1  - 2021
SN  - 978-3-030-77255-0
SN  - 978-3-030-77256-7
U6  - http://dx.doi.org/10.1007/978-3-030-77256-7_7
N1  - Proceedings of the 4th International Conference on Uncertainty in Mechanical Engineering (ICUME 2021), June 7–8, 2021
SP  - 70
EP  - 80
PB  - Springer
CY  - Cham
ER  - 
TY  - JOUR
A1  - Müller, Tim M.
A1  - Leise, Philipp
A1  - Lorenz, Imke-Sophie
A1  - Altherr, Lena
A1  - Pelz, Peter F.
T1  - Optimization and validation of pumping system design and operation for water supply in high-rise buildings
JF  - Optimization and Engineering
N2  - The application of mathematical optimization methods for water supply system design and operation provides the capacity to increase the energy efficiency and to lower the investment costs considerably. We present a system approach for the optimal design and operation of pumping systems in real-world high-rise buildings that is based on the usage of mixed-integer nonlinear and mixed-integer linear modeling approaches. In addition, we consider different booster station topologies, i.e. parallel and series-parallel central booster stations as well as decentral booster stations. To confirm the validity of the underlying optimization models with real-world system behavior, we additionally present validation results based on experiments conducted on a modularly constructed pumping test rig. Within the models we consider layout and control decisions for different load scenarios, leading to a Deterministic Equivalent of a two-stage stochastic optimization program. We use a piecewise linearization as well as a piecewise relaxation of the pumps’ characteristics to derive mixed-integer linear models. Besides the solution with off-the-shelf solvers, we present a problem specific exact solving algorithm to improve the computation time. Focusing on the efficient exploration of the solution space, we divide the problem into smaller subproblems, which partly can be cut off in the solution process. Furthermore, we discuss the performance and applicability of the solution approaches for real buildings and analyze the technical aspects of the solutions from an engineer’s point of view, keeping in mind the economically important trade-off between investment and operation costs.
KW  - Technical Operations Research
KW  - MINLP
KW  - MILP
KW  - Experimental validation
KW  - Pumping systems
Y1  - 2020
U6  - http://dx.doi.org/10.1007/s11081-020-09553-4
SN  - 1573-2924
VL  - 2021
IS  - 22
SP  - 643
EP  - 686
PB  - Springer
ER  - 
TY  - CHAP
A1  - Müller, Tim M.
A1  - Altherr, Lena
A1  - Leise, Philipp
A1  - Pelz, Peter F.
T1  - Optimization of pumping systems for buildings: Experimental validation of different degrees of model detail on a modular test rig
T2  - Operations Research Proceedings 2019
N2  - Successful optimization requires an appropriate model of the system under consideration. When selecting a suitable level of detail, one has to consider solution quality as well as the computational and implementation effort. In this paper, we present a MINLP for a pumping system for the drinking water supply of high-rise buildings. We investigate the influence of the granularity of the underlying physical models on the solution quality. Therefore, we model the system with a varying level of detail regarding the friction losses, and conduct an experimental validation of our model on a modular test rig. Furthermore, we investigate the computational effort and show that it can be reduced by the integration of domain-specific knowledge.
KW  - Experimental validation
KW  - MINLP
KW  - Engineering optimization
KW  - Water supply system
KW  - Network design
Y1  - 2020
SN  - 978-3-030-48438-5
U6  - http://dx.doi.org/10.1007/978-3-030-48439-2_58
N1  - Annual International Conference of the German Operations Research Society (GOR), Dresden, Germany, September 4-6, 2019
SP  - 481
EP  - 488
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Müller, Tim M.
A1  - Altherr, Lena
A1  - Ahola, Marja
A1  - Schabel, Samuel
A1  - Pelz, Peter F.
ED  - Rodrigues, H. C.
T1  - Multi-Criteria optimization of pressure screen systems in paper recycling – balancing quality, yield, energy consumption and system complexity
T2  - EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization
N2  - The paper industry is the industry with the third highest energy consumption in the European Union. Using recycled paper instead of fresh fibers for papermaking is less energy consuming and saves resources. However, adhesive contaminants in recycled paper are particularly problematic since they reduce the quality of the resulting paper-product. To remove as many contaminants and at the same time obtain as many valuable fibres as possible, fine screening systems, consisting of multiple interconnected pressure screens, are used. Choosing the best configuration is a non-trivial task: The screens can be interconnected in several ways, and suitable screen designs as well as operational parameters have to be selected. Additionally, one has to face conflicting objectives. In this paper, we present an approach for the multi-criteria optimization of pressure screen systems based on Mixed-Integer Nonlinear Programming. We specifically focus on a clear representation of the trade-off between different objectives.
Y1  - 2019
SN  - 978-3-319-97773-7
U6  - http://dx.doi.org/10.1007/978-3-319-97773-7_105
N1  - EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization. 17-19 September 2018. Lisboa, Portugal
PB  - Springer International Publishing
CY  - Basel
ER  - 
TY  - CHAP
A1  - Müller, Tim M.
A1  - Altherr, Lena
A1  - Ahola, Marja
A1  - Schabel, Samuel
A1  - Pelz, Peter F.
T1  - Optimizing pressure screen systems in paper recycling: optimal system layout, component selection and operation
N2  - Around 60% of the paper worldwide is made from recovered paper. Especially adhesive contaminants, so called stickies, reduce paper quality. To remove stickies but at the same time keep as many valuable fibers as possible, multi-stage screening systems with several interconnected pressure screens are used. When planning such systems, suitable screens have to be selected and their interconnection as well as operational parameters have to be defined considering multiple conflicting objectives. In this contribution, we present a Mixed-Integer Nonlinear Program to optimize system layout, component selection and operation to find a suitable trade-off between output quality and yield.
KW  - Mixed-integer nonlinear problem
KW  - MINLP
KW  - Process engineering
KW  - Paper recycling
KW  - Multi-criteria optimization
Y1  - 2018
SN  - 978-3-030-18499-5
U6  - http://dx.doi.org/10.1007/978-3-030-18500-8_44
SP  - 355
EP  - 361
PB  - Springer
CY  - Cham
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
A1  - Schwarz, Michael
T1  - Pegel- und Dämpfungsmessung an Wellenlängenmultiplex-Systemen und -Komponenten
JF  - Nachrichtentechnische Zeitschrift. 46 (1993), H. 1
Y1  - 1993
SN  - 0027-707X
SP  - 36
EP  - 38
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
A1  - Obolenski, B.
T1  - Webware mit elektromagnetischer Schirmwirkung
JF  - Melliand-Textilberichte. 85 (2004), H. 5
Y1  - 2004
SN  - 0341-0781
SP  - 348
EP  - 349
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
A1  - Obolenski, B.
T1  - Textilien und elektromagnetische Strahlung
JF  - Melliand-Textilberichte. 85 (2004), H. 3
Y1  - 2004
SN  - 0341-0781
SP  - 190
EP  - 192
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
A1  - Obolenski, B.
T1  - Elektromagnetisch schirmende Wirk- und Strickwaren
JF  - Melliand-Textilberichte. 85 (2004), H. 7-8
Y1  - 2004
SN  - 0341-0781
SP  - 587
EP  - 588
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
A1  - Kraus, E.
A1  - Peifer, Hermann-Josef
A1  - Obolenski, B.
T1  - Bekleidungstextilien mit elektromagnetischer Schirmwirkung
JF  - Technische Textilien. 48 (2005), H. 2
Y1  - 2005
SN  - 0323-3243
SP  - 160
EP  - 163
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
A1  - Binnebösel, Marcel
A1  - Klinge, Uwe
A1  - Goedderz, Thomas
T1  - New objective measurement to characterize the porosity of textile implants
JF  - Journal of Biomedical Materials Research Part B: Applied Biomaterials. 84B (2008), H. 1
Y1  - 2008
SN  - 1552-4981
SP  - 176
EP  - 183
ER  - 
TY  - BOOK
A1  - Mühl, Thomas
T1  - Einführung in die elektrische Messtechnik: mit 8 Tabellen
Y1  - 2001
SN  - 3-519-06388-3
N1  - neuere Aufl. vorhanden
PB  - Teubner
CY  - Stuttgart [u.a.]
ER  - 
TY  - JOUR
A1  - Mühl, Thomas
T1  - Berechnung von Lichtintensitätsverteilungen in streuenden Medien
Y1  - 1988
N1  - Aachen, Techn. Hochsch., Diss., 1988
ER  - 
TY  - BOOK
A1  - Mühl, Thomas
T1  - Einführung in die elektrische Messtechnik. Grundlagen, Messverfahren, Geräte ; mit 8 Tabellen und 53 Beispielen. 2., durchges. Aufl.
Y1  - 2006
SN  - 3-8351-0094-7
N1  - neuere Aufl. vorhanden
PB  - Teubner
CY  - Wiesbaden
ER  - 
TY  - BOOK
A1  - Mühl, Thomas
T1  - Einführung in die elektrische Messtechnik. Grundlagen, Messverfahren, Geräte ; mit 2 Tabellen und 54 Beispielen sowie 15 Aufgaben mit Lösungen. 3., neu bearb. Aufl.
Y1  - 2008
SN  - 978-3-8351-0189-0
PB  - Vieweg + Teubner
CY  - Wiesbaden
ER  - 
TY  - BOOK
A1  - Mühl, Thomas
T1  - Einführung in die elektrische Messtechnik : Grundlagen, Messverfahren, Anwendungen. - 4. aktualisierte u. erw. Aufl.
Y1  - 2014
SN  - 978-3-8348-2063-1 ; 978-3-8348-0899-8
PB  - Springer
CY  - Wiesbaden
ET  - 4., aktualisierte u. erw. Aufl.
ER  - 
TY  - BOOK
A1  - Mühl, Thomas
T1  - Elektrische Messtechnik : Grundlagen, Messverfahren, Anwendungen
Y1  - 2017
SN  - 978-3-658-15719-7
U6  - http://dx.doi.org/10.1007/978-3-658-15720-3
N1  - Signatur: 21 XXA 15(5)
PB  - Springer Vieweg
CY  - Wiesbaden
ET  - 5., überarbeitete und erweiterte Auflage
ER  - 
TY  - BOOK
A1  - Mühl, Thomas
T1  - Elektrische Messtechnik: Grundlagen, Messverfahren, Anwendungen
Y1  - 2020
SN  - 978-3-658-29115-0
U6  - http://dx.doi.org/10.1007/978-3-658-29116-7
N1  - gedruckt in der Bereichsbibliothek Eupener Str. unter der Signatur 21 XXA 15(6);
auch als Online-Ressource ISBN 978-3-658-29116-7
PB  - Springer Vieweg
CY  - Wiesbaden
ET  - 6., überarbeitete Auflage
ER  - 
TY  - CHAP
A1  - Moll, Florian
A1  - Köhler, Klemens
A1  - Wolf, Martin
T1  - Konzeption von IT-Sicherheitslösungen unter ethischen Gesichtspunkten am Beispiel einer Monitoring-App für mobile Endgeräte
T2  - Angewandte Forschung in der Wirtschaftsinformatik 2019 : Tagungsband zur 32. AKWI-Jahrestagung
N2  - Die steigende Popularität von mobilen Endgeräten im privaten und geschäftlichen Umfeld geht mit einem Anstieg an Sicherheitslücken und somit potentiellen Angriffsflächen einher. Als ein Element der technischen und organisatorischen Maßnahmen zum Schutz eines Netzwerkes können Monitoring-Apps dienen, die unerwünschtes Verhalten und Angriffe erkennen. Die automatisierte Überwachung von Endgeräten ist jedoch rechtlich und ethisch komplex. Dies in Kombination mit einer hohen Sensibilität der Nutzer und Nutzerinnen dieser Geräte in Bezug auf Privatsphäre, kann zu einer geringen Akzeptanz und Compliance führen. Eine datenschutzrechtlich und ethisch einwandfreie Konzeption solcher Apps bereits im Designprozess führt zu höherer Akzeptanz und verbessert so die Effizienz. Diese Analyse beschreibt Möglichkeiten zur Umsetzung.
Y1  - 2019
SN  - 978-3-944330-62-4
SP  - 61
EP  - 72
PB  - mana-Buch
CY  - Heide
ER  - 
TY  - CHAP
A1  - Meck, Marvin M.
A1  - Müller, Tim M.
A1  - Altherr, Lena
A1  - Pelz, Peter F.
T1  - Improving an industrial cooling system using MINLP, considering capital and operating costs
T2  - Operations Research Proceedings 2019
N2  - The chemical industry is one of the most important industrial sectors in Germany in terms of manufacturing revenue. While thermodynamic boundary conditions often restrict the scope for reducing the energy consumption of core processes, secondary processes such as cooling offer scope for energy optimisation. In this contribution, we therefore model and optimise an existing cooling system. The technical boundary conditions of the model are provided by the operators, the German chemical company BASF SE. In order to systematically evaluate different degrees of freedom in topology and operation, we formulate and solve a Mixed-Integer Nonlinear Program (MINLP), and compare our optimisation results with the existing system.
KW  - Engineering optimisation
KW  - Mixed-integer programming
KW  - Industrial optimisation
KW  - Cooling system
KW  - Process engineering
Y1  - 2020
SN  - 978-3-030-48438-5 (Print)
SN  - 978-3-030-48439-2 (Online)
U6  - http://dx.doi.org/10.1007/978-3-030-48439-2_61
N1  - Annual International Conference of the German Operations Research Society (GOR), Dresden, Germany, September 4-6, 2019.
SP  - 505
EP  - 512
PB  - Springer
CY  - Cham
ER  - 
TY  - BOOK
A1  - Mayer, Claudia
A1  - Rau, Uwe [Hrsg.]
T1  - Zwischen Ende und Anfang : individuelles Geschichtserleben 1945 und 1989 / Hrsg. von Claudia Mayer-Iswandy [u.a.]
Y1  - 1995
SN  - 2-9801595-6-5
N1  - Internationales und interdisziplinäres Symposium, 21. April 1995
PB  - Goethe-Institut Montréal
CY  - Montreal
ER  - 
TY  - BOOK
A1  - Mayer, Claudia
A1  - Grass, Günter
A1  - Neuhaus, Volker [Hrsg.]
T1  - Der Butt / Günter Grass. Hrsg. von Claudia Mayer
Y1  - 1987
SN  - 3-472-86644-6
N1  - Werkausgabe in zehn Bänden / Günter Grass. Hrsg. von Volker Neuhaus ; Bd. 5
2. ISBN: 3-472-86645-4
PB  - Luchterhand
CY  - Darmstadt
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
A1  - Fuchs, Britta
T1  - Der neue Studiengang Communication and Multimediadesign beginnt
JF  - Fachhochschule <Aachen>: Fachblatt. 2003 (2003), H. 2
Y1  - 2003
SP  - 11
EP  - 11
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Jenseits der Grenze. Asien im Werk von Günter Grass. Claudia Mayer-Iswandy
JF  - Ich will in das Herz Kalkuttas eindringen. Günter Grass in Indien und Bagladesch. Hrsg. von Martin Kämpchen.
Y1  - 2005
SN  - 3-86142-314-6
SP  - 159
EP  - 180
PB  - Ed. Isele
CY  - Eggingen
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - MBA-Studiengang "Entrepreneurship" in Düren bald auch mit Qualitätssiegel
JF  - Fachhochschule <Aachen>: Fachblatt. 2003 (2003), H. 2
Y1  - 2003
SN  - 1430-7707
SP  - 10
EP  - 10
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Eine Fundgrube für wahre Schätze. Das Archiv der German Society of Pennsylvania
JF  - Der neue Pennsylvanische Staatsbote (1999)
Y1  - 1999
SP  - 4
EP  - und 8
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Germanistik [Lexikoneintrag]
JF  - Modern Germany : an encyclopedia of history, people, and culture, 1871 - 1990 / ed.: Dieter K. Buse; Jürgen C. Doerr
Y1  - 1998
SN  - 0-8153-0503-6
SP  - 404
EP  - 407
PB  - Garland
CY  - New York
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - L'Estétique et le pouvoir: Le discours chaotique de l'Allemagne unifiée
JF  - Canadian review of comparative literature : CRCL = Revue canadienne de littérature comparée : RCLC / Canadian Comparative Literature Association. 24 (1997), H. 2
Y1  - 1997
SN  - 0319-051X
SP  - 297
EP  - 317
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Von »Unterbrechungen« und »Engführungen«. Lyrik und Prosa in Butt und Rättin
JF  - Günter Grass
Y1  - 1997
SN  - 3-88377-564-9
N1  - Text + Kritik ; 1
SP  - 86
EP  - 94
PB  - Ed. Text + Kritik
CY  - München
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Zum Verhältnis von Macht und Gewalt im Geschlechterkampf. Systemtheoretische Überlegungen zu Günter Grass und Ulla Hahn
JF  - Zeitschrift für Germanistik : G. 7 (1997), H. 2
Y1  - 1997
SN  - 0323-7982
SP  - 303
EP  - 320
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Ästhetik und Macht. Zur diskursiven Unordnung im vereinten Deutschland
JF  - German studies review. 19 (1996), H. 3
Y1  - 1996
SN  - 0149-7952
SP  - 501
EP  - 523
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Between Trans- and Interdisciplinarity. »Germanistik« and the Dialectic of Inclusion and Exclusion of the Other(s)
JF  - Language and literature today : proceedings of the XIXth triennal congress of the International Federation for Modern Languages and Literatures ; Brasília 22 - 30 August 1993. General ed. Neide de Faria.
Y1  - 1993
SN  - 85-230-0405-x
N1  - Band 2
SP  - 958
EP  - 966
PB  - Univ.
CY  - Brasilia
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Between Resistance and Affirmation: Christa Wolf and German Unification
JF  - Canadian review of comparative literature : CRCL = Revue canadienne de littérature comparée / Canadian Comparative Literature Association. 22 (1995), H. 3-4
Y1  - 1995
SN  - 0319-051X
SP  - 813
EP  - 835
ER  - 
TY  - BOOK
A1  - Mayer, Claudia
T1  - "Vom Glück der Zwitter" : Geschlechterrolle und Geschlechterverhältnis bei Günter Grass / Claudia Mayer-Iswandy
Y1  - 1991
SN  - 3-631-43508-8
N1  - Zugl.: Köln, Univ., Diss., 1990; Kölner Studien zur Literaturwissenschaft ; 3
PB  - Lang
CY  - Frankfurt am Main [u.a.]
ER  - 
TY  - BOOK
A1  - Mayer, Claudia
T1  - Günter Grass / von Claudia Mayer-Iswandy
Y1  - 2002
SN  - 3-423-31059-6
N1  - dtv ; 31059 : dtv portrait ; 31059 : dtv portrait
PB  - Dt. Taschenbuch-Verl.
CY  - München
ER  - 
TY  - BOOK
A1  - Mayer, Claudia
T1  - Kunst : von der Steinzeit bis zur Moderne / [Text: Claudia Mayer-Iswandy]
Y1  - 2001
SN  - 3-7701-8624-9
PB  - DuMont
CY  - Köln
ER  - 
TY  - BOOK
A1  - Mayer, Claudia
T1  - Art : from prehistoric art to modernism / [Text: Claudia Mayer-Iswandy]
Y1  - 2001
SN  - 3-7701-7048-2
N1  - (Flipguide)
PB  - DuMont
CY  - Köln
ER  - 
TY  - BOOK
A1  - Mayer, Claudia
T1  - Der Butt : Roman / Günter Grass. Hrsg. von Claudia Mayer-Iswandy
Y1  - 1997
SN  - 3-88243-489-9
N1  - Grass, Günter: Werkausgabe, 8
PB  - Steidl
CY  - Göttingen
ER  - 
TY  - BOOK
A1  - Mayer, Claudia
T1  - Das Treffen in Telgte : eine Erzählung / Günter Grass. Hrsg. von Claudia Mayer-Iswandy
Y1  - 1997
SN  - 3-88243-490-2
N1  - Grass, Günter: Werkausgabe, 9
PB  - Steidl
CY  - Göttingen
ER  - 
TY  - BOOK
A1  - Mayer, Claudia
T1  - Zwischen Traum und Trauma - die Nation : transatlantische Perspektiven zur Geschichte eines Problems / Claudia Mayer-Iswandy (Hrsg.)
Y1  - 1994
SN  - 3-86057-132-X
N1  - Stauffenburg-Colloquium ; 32
PB  - Stauffenburg-Verl.
CY  - Tübingen
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Versuche einer Rebellion. Zur Anpassung des Körpers an den Geist
JF  - Verleiblichungen : literatur- und kulturgeschichtliche Studien über Strategien, Formen und Funktionen der Verleiblichung in Texten von der Frühzeit bis zum Cyberspace / Burkhardt Krause ... (Hrsg.)
Y1  - 1996
SN  - 3-86110-089-4
N1  - Mannheimer Studien zur Literatur- und Kulturwissenschaft ; 7
SP  - 219
EP  - 246
PB  - Röhrig-Univ.-Verl.
CY  - St. Ingbert
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Weiße Schimmel gibt's nicht mehr. Zum Problem der literarischen Ästhetik
JF  - Zwischen Traum und Trauma - die Nation : transatlantische Perspektiven zur Geschichte eines Problems / Claudia Mayer-Iswandy (Hrsg.)
Y1  - 1994
SN  - 3-86057-132-X
N1  - Stauffenburg-Colloquium ; 32
SP  - 85
EP  - 97
PB  - Stauffenburg-Verl.
CY  - Tübingen
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Wie national ist die Germanistik? Die Scheu der Literaturwissenschaft vor der eigenen Vergangenheit
JF  - Frankfurter Rundschau. 159 (1993), H. 13.07.1993
Y1  - 1993
SP  - 14
EP  - 14
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Zwischen Traum und Trauma: Einführende Bemerkungen zum »Komplex Nation«
JF  - Zwischen Traum und Trauma - die Nation : transatlantische Perspektiven zur Geschichte eines Problems / Claudia Mayer-Iswandy (Hrsg.)
Y1  - 1994
SN  - 3-86057-132-X
N1  - Stauffenburg-Colloquium ; 32
SP  - 13
EP  - 24
PB  - Stauffenburg-Verl.
CY  - Tübingen
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Frauen und Revolution: Der weibliche Anteil an der Geschichte. Christa Wolf und das Ende der DDR
JF  - Women in German Newsletter. 56 (1991)
Y1  - 1991
N1  - (gesehen am 03.04.2007)
SP  - 29
EP  - 30
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Auf dem Holzweg zur Wasserstelle. Ökologischer Tourismus auf der Karibik-Insel St. John
JF  - Frankfurter Rundschau. 81 (1992), H. 14
Y1  - 1992
N1  - 4.4.1992
SP  - M5
EP  - M5
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Aspekte der Wiedervereinigung in der aktuellen deutschen Literatur.
JF  - Forum Deutsch : Informationen, Meinungen, Materialien und Tips für kanadische Deutschlehrer / Ständige Konferenz kanadischer Deutschlehrer (1991)
Y1  - 1991
SP  - 16
EP  - 22
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Das Ich ist eine Illusion
JF  - Deutsches Allgemeines Sonntagsblatt (1990)
Y1  - 1990
N1  - "Gott und die Welt"
SP  - 16
EP  - 16
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Bali. Blüteninsel im Indischen Ozean. Reisebericht
JF  - Fliegende Blätter / Condor (1990)
Y1  - 1990
N1  - Condor-Flugdienst <Frankfurt, Main>
SP  - 61
EP  - 64
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Elf Tage Schweigen. Bericht zu Buddhismus und Meditation in Thailand
JF  - Frankfurter Allgemeine Zeitung (1989)
Y1  - 1989
SP  - R5
EP  - R6
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Von »Unterbrechungen« und »Engführungen«. Lyrik und Prosa in Butt und Rättin
JF  - Günter Grass
Y1  - 1988
SN  - 3-88377-285-2
N1  - 6. Aufl.: Neufassung
SP  - 84
EP  - 92
PB  - Ed. Text + Kritik
CY  - München
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Danach ging das Leben weiter : Macht und Gewalt im Geschlechterkampf bei Günter Grass. Mayer-Iswandy, Claudia
JF  - Alte Welten - neue Welten : Akten des IX. Kongresses der Internationalen Vereinigung für germanische Sprach- und Literaturwissenschaft (IVG) ; [Akten des IX. Internationalen Germanisten-Kongresses, Vancouver 1995] / hrsg. von Michael S. Batts. Bd. 2: Abstracts
Y1  - 1996
SN  - 3-484-10716-2
N1  - Internationaler Germanisten-Kongress <Internationale Vereinigung für Germanische Sprach- und Literaturwissenschaft, 9, 1995, Vancouver, British Columbia>
SP  - 37
PB  - Niemeyer
CY  - Tübingen
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Internet statt Zeitung? Nein, Internet und Zeitung!
JF  - Aachener Zeitung. 08.01.2007 (2007)
Y1  - 2007
N1  - Zukunft der Medien
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Die Lebensbeichte des Günter Grass
JF  - Aachener Zeitung. 28.12.2006 (2006)
Y1  - 2006
N1  - Telegramme
SP  - 8
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Die Beichte eines Mahners an seinem Lebensabend.  Das späte Bekenntnis des Günter Grass. Analysierende Rückschau auf sein SS-Eingeständnis
JF  - Aachener Nachrichten. 28.12.2006 (2006)
Y1  - 2006
SP  - 8
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Meine besten Rezepte
JF  - Kinder, Karriere, Kochvergnügen : Prominente Aachenerinnen verraten ihre besten Rezepte / Hrsg. von Claudia Dechamps . Fotos: Harald Krömer
Y1  - 2008
SP  - 30
EP  - 33
PB  - Corporate Publishing Claudia Dechamps
CY  - Aachen
ER  - 
TY  - JOUR
A1  - Mayer, Claudia
T1  - Das globale Dorf ist sein bekanntes Schlagwort
JF  - Aachener Nachrichten
KW  - McLuhan, Marshall
Y1  - 2011
N1  - zugleich Aachener Zeitung vom 27.12.2011 Seite 12
IS  - 27.12.2011
SP  - 12
EP  - 12
ER  - 
TY  - CHAP
A1  - Mayer, Claudia
T1  - Innovation und Kommunikation
T2  - Innovation durch Kooperation : wie der Mittelstand durch Zusammenarbeit mit den Hochschulen seine Wettbewerbsfähigkeit steigert : Festschrift für Prof. Dr. rer. nat. Johannes Gartzen / Thomas Gartzen, Ute Gartzen (Hrsg.)
Y1  - 2013
SN  - 978-3-86359-136-6
SP  - 145
EP  - 149
PB  - Apprimus Verlag
CY  - Aachen
ER  - 
TY  - JOUR
A1  - Maus, Stefan
A1  - Höfken, Hans-Wilhelm
A1  - Schuba, Marko
T1  - Forensic Analysis of Geodata in Android Smartphones
Y1  - 2011
N1  - Cyberforensics 2011, Glasgow
SP  - 1
EP  - 11
ER  - 
TY  - CHAP
A1  - Mataré, Victor
A1  - Schiffer, Stefan
A1  - Ferrein, Alexander
ED  - Steinbauer, Gerald
ED  - Ferrein, Alexander
T1  - golog++ : An integrative system design
T2  - CogRob 2018. Cognitive Robotics Workshop : Proceedings of the 11th Cognitive Robotics Workshop 2018 co-located with 16th International Conference on Principles of Knowledge Representation and Reasoning (KR 2018) Tempe, AZ, USA, October 27th, 2018
Y1  - 2019
SN  - 1613-0073
SP  - 29
EP  - 35
ER  - 
TY  - CHAP
A1  - Marco, Heather G.
A1  - Ferrein, Alexander
T1  - AGNES: The African-German Network of Excellence in Science
T2  - Proceedings of the 2nd Developing World Robotics Forum, Workshop at IEEE AFRICON 2017
Y1  - 2017
SP  - 1
EP  - 2
ER  - 
TY  - CHAP
A1  - Maike, Müller
A1  - Lenz, Laura
A1  - Wolf, Martin
T1  - Steigerung der Effektivität durch Prozessmodellierungs-Tools - Änderbarkeit und Transparenz von Prozessen am Beispiel der Business Simulation Apollo 13
T2  - Informatik 2014
N2  - Die Nutzung von Prozessmodellierungsmethoden oder - werkzeugen kann erheblichen Einfluss auf die Effektivität von Prozessen haben. Das gilt insbesondere für Situationen, in denen Personen unter Stress stehen oder ungeübt sind. In diesen Fällen geben Prozessmodelle konkrete Empfehlungen, nach denen sich die handelnden Personen richten könnten. In Experimenten mit der Business-Simulation Apollo 13 haben wir den Effekt eines Einsatzes von Prozessmodellierungsmethoden und -werkzeugen untersucht. Bereits bekannte Theorien (z.B. über geeignete Verhältnisse von Kommunikationsinhalten) konnten bestätigt werden. Darüber hinaus haben wir eine besondere Bedeutung der Übertragbarkeit von Prozessmodellen in konkrete Handlungen identifiziert.
Y1  - 2014
SN  - 978-3-88579-626-8
SN  - 1617-5468
SP  - 357
EP  - 369
PB  - Gesellschaft für Informatik e.V.
CY  - Bonn
ER  - 
TY  - BOOK
A1  - Mai, Herbert
A1  - Schumny, Harald
A1  - Alt, Helmut
T1  - Lineares Optimieren : Maximierung - Minimierung (Vieweg Programmbibliothek Mikrocomputer ; 14) / Helmut Alt ; Harald Schumny [Hrsg.]
Y1  - 1984
SN  - 978-3-663-14049-8 ; 978-3-528-04312-4
PB  - Vieweg + Teubner
CY  - Wiesbaden
ER  - 
TY  - JOUR
A1  - Maas, Marnix C.
A1  - Vos, Eline K.
A1  - Lagemaat, Miriam W.
A1  - Bitz, Andreas
A1  - Orzada, Stephan
A1  - Kobus, Thiele
A1  - Kraff, Oliver
A1  - Maderwald, Stefan
A1  - Ladd, Mark E.
A1  - Scheenen, Tom W. J.
T1  - Feasibility of T₂-weighted turbo spin echo imaging of the human prostate at 7 tesla
JF  - Magnetic Resonance in Medicine
N2  - Purpose
To demonstrate that high quality T₂-weighted (T2w) turbo spin-echo (TSE) imaging of the complete prostate can be achieved routinely and within safety limits at 7 T, using an external transceive body array coil only.

Methods
Nine healthy volunteers and 12 prostate cancer patients were scanned on a 7 T whole-body system. Preparation consisted of B₀ and radiofrequency shimming and localized flip angle calibration. T₁ and T₂ relaxation times were measured and used to define the T2w-TSE protocol. T2w imaging was performed using a TSE sequence (pulse repetition time/echo time 3000–3640/71 ms) with prolonged excitation and refocusing pulses to reduce specific absorption rate.

Results
High quality T2w TSE imaging was performed in less than 2 min in all subjects. Tumors of patients with gold-standard tumor localization (MR-guided biopsy or prostatectomy) were well visualized on 7 T imaging (n = 3). The number of consecutive slices achievable within a 10-g averaged specific absorption rate limit of 10 W/kg was ≥28 in all subjects, sufficient for full prostate coverage with 3-mm slices in at least one direction.

Conclusion
High quality T2w TSE prostate imaging can be performed routinely and within specific absorption rate limits at 7 T with an external transceive body array.
Y1  - 2014
U6  - http://dx.doi.org/10.1002/mrm.24818
SN  - 1522-2594
VL  - 71
IS  - 5
SP  - 1711
EP  - 1719
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - CHAP
A1  - Luszczynski, K.
A1  - Engels, Elmar
T1  - Vergleichende Untersuchung zur Topologie von zelloptimalen, elektromobilitäts-optimierten Ladungsausgleichsvorrichtungen
T2  - Tagungsband zur AALE-Tagung 2012 : 9. Fachkonferenz
Y1  - 2012
SN  - 978-3-8356-3305-6
N1  - AALE 2012
SP  - 165
EP  - 174
PB  - Oldenbourg Industrieverlag
CY  - München
ER  - 
TY  - CHAP
A1  - Luczak, Holger
A1  - Wolf, Martin
A1  - Schlick, Christopher
A1  - Springer, J.
A1  - Foltz, Christian
ED  - Nagl, Walter
T1  - Personenorientierte Arbeitsprozesse und Kommunikationsforrnen
T2  - Integration von Entwicklungssystemen in Ingenieuranwendungen : substantielle Verbesserung der Entwicklungsprozesse
Y1  - 1999
SN  - 3-540-63920-9
SP  - 403
EP  - 422
PB  - Springer
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Luczak, Holger
A1  - Wolf, Martin
A1  - Mühlfelder, M.
ED  - Schwabe, Gerhard
T1  - Arbeitswissenschaft
T2  - CSCW-Kompendium : Lehr- und Handbuch zum computerunterstützten kooperativen Arbeiten ; mit 9 Tabellen
N2  - Unter Arbeit wird das Tätigsein des Menschen verstanden, bei dem dieser mit anderen Menschen und (technischen) Hilfsmitteln in Interaktion tritt, um unter wirtschaftlichen Zielsetzungen Güter und Dienstleistungen zu erstellen (Luczak, 1998a). Arbeit dient direkt oder indirekt der Erhaltung der eigenen Existenz und der Existenz der Gesellschaft. Arbeit ist deshalb eine besondere Form des Tätigseins neben anderen wie Spiel, Sport, Lemen usw.
Y1  - 2001
SN  - 978-3-540-67552-5
SN  - 978-3-642-56848-0
U6  - http://dx.doi.org/10.1007/978-3-642-56848-0_2
SP  - 7
EP  - 14
PB  - Springer
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Lorenz, Imke-Sophie B.
A1  - Altherr, Lena
A1  - Pelz, Peter F.
T1  - Graph-theoretic resilience analysis of a water distribution system's topology
T2  - World Congress on Resilience, Reliability and Asset Management 2019
N2  - Water suppliers are faced with the great challenge of achieving high-quality and, at the same time, low-cost water supply. In practice, the focus is set on the most beneficial maintenance measures and/or capacity adaptations of existing water distribution systems (WDS). Since climatic and demographic influences will pose further challenges in the future, the resilience enhancement of WDS, i.e. the enhancement of their capability to withstand and recover from disturbances, has been in particular focus recently. To assess the resilience of WDS, metrics based on graph theory have been proposed. In this study, a promising approach is applied to assess the resilience of the WDS for a district in a major German City. The conducted analysis provides insight into the process of actively influencing the
resilience of WDS
KW  - Resilience Assessment
KW  - Graph Theory
KW  - Water Supply System
KW  - Case Study
Y1  - 2019
N1  - World Congress on Resilience, Reliability and Asset Management, 28-31 July 2019. Furama Riverfront Hotel, Singapore
SP  - 106
EP  - 109
ER  - 
TY  - CHAP
A1  - Lorenz, Imke-Sophie
A1  - Altherr, Lena
A1  - Pelz, Peter F.
ED  - Neufeld, Janis S.
ED  - Buscher, Udo
ED  - Lasch, Rainer
ED  - Möst, Dominik
ED  - Schönberger, Jörn
T1  - Assessing and Optimizing the Resilience of Water Distribution Systems Using Graph-Theoretical Metrics
T2  - Operations Research Proceedings 2019
N2  - Water distribution systems are an essential supply infrastructure for cities. Given that climatic and demographic influences will pose further challenges for these infrastructures in the future, the resilience of water supply systems, i.e. their ability to withstand and recover from disruptions, has recently become a subject of research. To assess the resilience of a WDS, different graph-theoretical approaches exist. Next to general metrics characterizing the network topology, also hydraulic and technical restrictions have to be taken into account. In this work, the resilience of an exemplary water distribution network of a major German city is assessed, and a Mixed-Integer Program is presented which allows to assess the impact of capacity adaptations on its resilience.
KW  - OR 2019
KW  - business analytics
KW  - decision analytics
KW  - digital economy
KW  - mathematical optimization
Y1  - 2020
SN  - 978-3-030-48439-2
SN  - 978-3-030-48438-5
U6  - http://dx.doi.org/10.1007/978-3-030-48439-2_63
N1  - Annual International Conference of the German Operations Research Society (GOR), Dresden, Germany, September 4-6, 2019
SP  - 521
EP  - 527
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Lorenz, Imke-Sophie
A1  - Altherr, Lena
A1  - Pelz, Peter F.
T1  - Resilience enhancement of critical infrastructure – graph-theoretical resilience analysis of the water distribution system in the German city of Darmstadt
T2  - 14th WCEAM Proceedings
N2  - Water suppliers are faced with the great challenge of achieving high-quality and, at the same time, low-cost water supply. Since climatic and demographic influences will pose further challenges in the future, the resilience enhancement of water distribution systems (WDS), i.e. the enhancement of their capability to withstand and recover from disturbances, has been in particular focus recently. To assess the resilience of WDS, graph-theoretical metrics have been proposed. In this study, a promising approach is first physically derived analytically and then applied to assess the resilience of the WDS for a district in a major German City. The topology based resilience index computed for every consumer node takes into consideration the resistance of the best supply path as well as alternative supply paths. This resistance of a supply path is derived to be the dimensionless pressure loss in the pipes making up the path. The conducted analysis of a present WDS provides insight into the process of actively influencing the resilience of WDS locally and globally by adding pipes. The study shows that especially pipes added close to the reservoirs and main branching points in the WDS result in a high resilience enhancement of the overall WDS.
KW  - Resilient infrastructure
KW  - Resilience assessment
KW  - Resilience metric graph theory
KW  - Water distribution system
KW  - Case study
Y1  - 2020
SN  - 978-3-030-64228-0
SN  - 978-3-030-64227-3
U6  - http://dx.doi.org/10.1007/978-3-030-64228-0_13
N1  - 14th WCEAM Proceedings. World Congress on Engineering Asset Management, 28-31 July 2019, Singapore

Part of the Lecture Notes in Mechanical Engineering book series (LNME)
SP  - 137
EP  - 149
PB  - Springer
CY  - Cham
ER  - 
TY  - BOOK
A1  - Lohr, Jürgen
A1  - Deppe, Andreas
T1  - Der CMS-Guide : Content-Management-Systeme: Erfolgsfaktoren, Geschäftsmodelle, Produktübersicht
Y1  - 2001
SN  - 3-528-05768-8
PB  - Vieweg
CY  - Braunschweig [u.a.]
ER  - 
TY  - BOOK
A1  - Lohr, Jürgen
T1  - Probleme und Lösungen von Multimedia-Diensten und interaktiven Kommunikationsdiensten im nationalen und internationalen Umfeld
Y1  - 1998
SN  - 3-18-356410-6
N1  - Zugl.: Berlin, TU, Diss., 1998 ; Fortschritt-Berichte VDI : Reihe 10, Informatik, Kommunikationstechnik ; 564
PB  - VDI-Verl.
CY  - Düsseldorf
ER  - 
TY  - BOOK
A1  - Lohr, Jürgen
T1  - High Definition Media Services : Zukunft des Rundfunks im Internet: Technologien und Anwendungsperspektiven
Y1  - 2009
SN  - 978-3-7949-0789-2
PB  - Schiele & Schön
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Logen, Steffen
A1  - Höfken, Hans
A1  - Schuba, Marko
T1  - Simplifying RAM Forensics : A GUI and Extensions for the Volatility Framework
T2  - 2012 Seventh International Conference on Availability, Reliability and Security (ARES), 20-24 August 2012, Prague, Czech Republic
N2  - The Volatility Framework is a collection of tools for the analysis of computer RAM. The framework offers a multitude of analysis options and is used by many investigators worldwide. Volatility currently comes with a command line interface only, which might be a hinderer for some investigators to use the tool. In this paper we present a GUI and extensions for the Volatility Framework, which on the one hand simplify the usage of the tool and on the other hand offer additional functionality like storage of results in a database, shortcuts for long Volatility Framework command sequences, and entirely new commands based on correlation of data stored in the database.
Y1  - 2012
SN  - 978-1-4673-2244-7
U6  - http://dx.doi.org/10.1109/ARES.2012.12
SP  - 620
EP  - 624
PB  - IEEE
CY  - New York
ER  - 
TY  - CHAP
A1  - Lindner, Marvin
A1  - Kolb, Andreas
A1  - Ringbeck, Thorsten
T1  - New insights into the calibration of ToF-sensors
T2  - 2008 IEEE Computer Society Conference on Computer Vision and Pattern Recognition workshops : Anchorage, AK, 23 - 28 June 2008
N2  - Time-of-flight (ToF) sensors have become an alternative to conventional distance sensing techniques like laser scanners or image based stereo. ToF sensors provide full range distance information at high frame-rates and thus have a significant impact onto current research in areas like online object recognition, collision prevention or scene reconstruction. However, ToF cameras like the photonic mixer device (PMD) still exhibit a number of challenges regarding static and dynamic effects, e.g. systematic distance errors and motion artefacts, respectively. Sensor calibration techniques reducing static system errors have been proposed and show promising results. However, current calibration techniques in general need a large set of reference data in order to determine the corresponding parameters for the calibration model. This paper introduces a new calibration approach which combines different demodulation techniques for the ToF- camera 's reference signal. Examples show, that the resulting combined demodulation technique yields improved distance values based on only two required reference data sets.
Y1  - 2008
SN  - 978-1-4244-2339-2
SN  - 978-1-4244-2340-8
SP  - 1
EP  - 5
PB  - IEEE Service Center
CY  - Piscataway, NJ
ER  - 
TY  - CHAP
A1  - Lindenlauf, Simon
A1  - Höfken, Hans-Wilhelm
A1  - Schuba, Marko
T1  - Cold Boot Attacks on DDR2 and DDR3 SDRAM
T2  - 10th International Conference on Availability, Reliability and Security (ARES) 2015
Y1  - 2015
U6  - http://dx.doi.org/10.1109/ARES.2015.28
SP  - 287
EP  - 292
ER  - 
TY  - JOUR
A1  - Limpert, Nicolas
A1  - Wiesen, Patrick
A1  - Ferrein, Alexander
A1  - Kallweit, Stephan
A1  - Schiffer, Stefan
T1  - The ROSIN Project and its Outreach to South Africa
JF  - R&D Journal
Y1  - 2019
VL  - 35
SP  - 1
EP  - 6
ER  - 
TY  - CHAP
A1  - Limpert, Nicolas
A1  - Schiffer, Stefan
A1  - Ferrein, Alexander
T1  - A Local Planner for Ackermann-Driven Vehicles in ROS SBPL
T2  - Proceedings of the International Conference on Pattern Recognition Association of South Africa and Robotics and Mechatronics (PRASA-RobMech), 2015
Y1  - 2015
U6  - http://dx.doi.org/10.1109/RoboMech.2015.7359518
SP  - 172
EP  - 177
ER  - 
TY  - RPRT
A1  - Leßenich, Nina
A1  - Ritz, Thomas
A1  - Wallenborn, Ramona
T1  - Prototyping zur Verbesserung der Benutzerfreundlichkeit mobiler Software : Potenziale benutzerfreundlicher Software-Entwicklung ; Info-Broschüre
N2  - Mobile Anwendungen nehmen mit der Verbreitung von Smartphones zu. Die Akzeptanz der Nutzer bestimmt den Erfolg solcher mobiler Applikationen dabei maßgeblich. Um diese Anerkennung zu schaffen, ist eine möglichst hohe Gebrauchstauglichkeit, auch Usability genannt, notwendig. Die Informationsbroschüre „Prototyping zur Verbesserung der Benutzerfreundlichkeit mobiler Software“ richtet sich an Personen, die an der Gestaltung und entwicklung von (mobiler) Software beteiligt sind. In dieser Broschüre werden mögliche Potenziale im Bereich einer effizienten und benutzerzentrierten Software-Entwicklung aufgezeigt.
Y1  - 2014
PB  - eBusiness-Lotse
CY  - Aachen
ER  - 
TY  - JOUR
A1  - Lerchl, Alexander
A1  - Krüger, Heike
A1  - Niehaus, Michael
A1  - Streckert, Joachim R.
A1  - Bitz, Andreas
A1  - Hansen, Volkert
T1  - Effects of mobile phone electromagnetic fields at nonthermal SAR values on melatonin and body weight of Djungarian hamsters (Phodopus sungorus)
JF  - Journal of Pineal Research
Y1  - 2008
U6  - http://dx.doi.org/10.1111/j.1600-079X.2007.00522.x
SN  - 1600-079X
VL  - 44
IS  - 3
SP  - 267
EP  - 272
ER  - 
TY  - JOUR
A1  - Lepers, Heinrich
A1  - Rake, H.
A1  - Pütter, L.
T1  - Regelung der Qualitaet beim Brennen von Zementklinker
JF  - Regelungstechnische Praxis : rtp
Y1  - 1976
SN  - 0340-4730
VL  - 18
IS  - 4
SP  - 87
EP  - 91
PB  - Oldenbourg
CY  - München
ER  - 
TY  - JOUR
A1  - Lepers, Heinrich
A1  - Rake, H.
A1  - Pütter, L.
T1  - Prozeßrechnerautomatisierung von Wärmeprozessen in der Grundstoffindustrie
JF  - Industrie-Anzeiger
Y1  - 1976
SN  - 0019-9036
VL  - 98
IS  - 17/18
SP  - 286
EP  - 289
PB  - Konradin
CY  - Leinfelden-Echterdingen
ER  - 
TY  - JOUR
A1  - Lepers, Heinrich
A1  - Rake, H.
A1  - Pütter, L.
T1  - Prozeßrechnerautomatisierung von Wärmeprozessen
JF  - Elektro-Anzeiger
Y1  - 1976
SN  - 0013-5518
VL  - 29
IS  - 5
SP  - 98
EP  - 101
PB  - Konradin
CY  - Leinfelden-Echterdingen
ER  - 
TY  - JOUR
A1  - Lepers, Heinrich
A1  - Jäger, G.
A1  - Pütter, L.
T1  - Anwendung eines Prozessmodells zur Regelung der Produktqualität bei der Zementklinker-Herstellung / Jaeger, G. ; Lepers, H. Puetter, L. [u.a.]
JF  - VDI-Berichte (1977)
Y1  - 1977
SP  - 87
EP  - 93
ER  - 
TY  - BOOK
A1  - Lepers, Heinrich
T1  - SPS-Programmierung nach IEC 61131-3: mit Beispielen CoDeSys und STEP 7 ; [auf 3 CD-ROMs Installationssoftware für CoDeSys und STEP 7 mit CFC, alle Beispiele aus dem Buch für CoDeSys und STEP 7, alle Lösungen zu den Übungsprojekten für CoDeSys und STEP 7]
Y1  - 2005
SN  - 3-7723-5801-2
N1  - neuere Aufl. vorh.
PB  - Franzis
CY  - Poing
ER  - 
TY  - JOUR
A1  - Lepers, Heinrich
T1  - Integrationsverfahren zur Systemidentifizierung aus gemessenen Systemantworten
JF  - Regelungstechnik
N2  - Für viele Zwecke ist es nützlich, von einem technischen System ein mathematisches Modell zu haben. Für Systeme, die sich durch eine Verzögerung höherer Ordnung mit oder ohne Ausgleich beschreiben lassen, wird ein Identifizierungsverfahren vorgestellt, das aus gemessenen Zeitfunktionen die Bestimmung einer Übertragungsfunktion ermöglicht. Die Systeme werden dabei durch Testsignale erregt. Die Modellkoeffizienten werden dann mit Hilfe eines Integrationsverfahrens aus dem Testsignal und der Antwort des Systems auf dieses Testsignal bestimmt. Ein praktisches Beispiel zeigt die Leistungsfähigkeit des Verfahrens.
Y1  - 1972
U6  - http://dx.doi.org/10.1524/auto.1972.20.112.417
VL  - 20
IS  - 10
SP  - 417
EP  - 422
PB  - Oldenbourg
CY  - München
ER  - 
TY  - JOUR
A1  - Lepers, Heinrich
T1  - Fehler bei der Systemanalyse aus stochastisch gestörten Sprungantworten
JF  - Regelungstechnik und Prozeß-Datenverarbeitung
N2  - Es wird von Gleichungen ausgegangen, mit denen die Modellkoeffizienten von Regelstrecken mit Ausgleich aus der gemessenen Sprungantwort ermittelt werden können.  Die Übertragungsfunktion der Regelstrecke hat einen konstanten Zähler und ein Nennerpolynom. Unter der Annahme, daß die ideale und exakte Sprungantwort des Systems durch ein stochastisches Signal gestört wird, wird untersucht, wie die Fehler der ermittelten Modellkoeffizienten von Kennwerten des Störsignals und von der Meßzeit für die Sprungantwort abhängen. Durch eine Simulation auf dem Digitalrechner wurden die Ergebnisse kontrolliert. Es zeigt sich, daß durch eine Filterung der gestörten Sprungantwort über einen Tiefpaß keine Verbesserung der Analyseergebnisse erreicht werden kann, da das Identifizierungsverfahren eine glättende Eigenschaft hat.
Y1  - 1973
U6  - http://dx.doi.org/10.1524/auto.1973.21.112.229
SN  - 0034-3226
VL  - 21
IS  - 7
SP  - 229
EP  - 233
PB  - De Gruyter
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Lepers, Heinrich
T1  - Empfindlichkeitsuntersuchungen zur Beurteilung von Optimierungen mit fehlerhaften Modellen
JF  - Messen, Steuern, Regeln
Y1  - 1972
SN  - 0026-0347
VL  - 15
IS  - 11
SP  - 407
EP  - 410
PB  - Oldenbourg
CY  - München
ER  - 
TY  - BOOK
A1  - Lepers, Heinrich
T1  - Identifizierung von stochastisch gestörten Regelstrecken mit aperiodischen Testsignalen
Y1  - 1971
N1  - Techn. Hochsch., Diss.--Aachen, 1971
ER  - 
TY  - BOOK
A1  - Lepers, Heinrich
T1  - SPS-Programmierung nach IEC 61131-3 : mit Beispielen für CoDeSys und STEP 7 /  	2. Aufl.
Y1  - 2007
SN  - 978-3-7723-5805-0
N1  - [neuere Aufl. vorh.]
CD-ROM-Beil. u.d.T.: SIMATIC CFC V7.0 und STEP 7 Professional Edition 2004 SR4
PB  - Franzis
CY  - Poing
ER  - 
TY  - BOOK
A1  - Lepers, Heinrich
T1  - SPS-Programmierung nach IEC 61131-3 : mit Beispielen für CoDeSys und STEP 7 ; [auf 4 DVDs/CDs: Installationssoftware für CoDeSys, STEP 7 und WINCC flexible ; alle Beispiele aus dem Buch für CoDeSys und STEP7 ; alle Lösungen zu den Übungsprojekten für CoDeSys und STEP 7] / Heinrich Lepers . 3. neu bearb. Aufl.
Y1  - 2009
SN  - 978-3-7723-5806-7
PB  - Franzis
CY  - Poing
ER  - 
TY  - CHAP
A1  - Lenz, Laura L.
A1  - Wolf, Martin
ED  - Kritz, Willy Christian
T1  - Economic evaluation of serious games with the comparative assessment framework COSEGA
T2  - The shift from teaching to learning : individual, collective and organizational learning through gaming simulation ; proceedings of the 45th conference of the International Simulation and Gaming Association, Dornbirn 2014
Y1  - 2014
SN  - 978-3-7639-5422-3
SP  - 374
EP  - 386
PB  - Bertelsmann
CY  - [Bielefeld]
ER  - 
TY  - CHAP
A1  - Leise, Philipp
A1  - Simon, Nicolai
A1  - Altherr, Lena
T1  - Comparison of Piecewise Linearization Techniques to Model Electric Motor Efficiency Maps: A Computational Study
T2  - Operations Research Proceedings 2019
N2  - To maximize the travel distances of battery electric vehicles such as cars or buses for a given amount of stored energy, their powertrains are optimized energetically. One key part within optimization models for electric powertrains is the efficiency map of the electric motor. The underlying function is usually highly nonlinear and nonconvex and leads to major challenges within a global optimization process. To enable faster solution times, one possibility is the usage of piecewise linearization techniques to approximate the nonlinear efficiency map with linear constraints. Therefore, we evaluate the influence of different piecewise linearization modeling techniques on the overall solution process and compare the solution time and accuracy for methods with and without explicitly used binary variables.
KW  - MINLP
KW  - Powertrain
KW  - Piecewise linearization
KW  - Efficiency optimization
Y1  - 2020
SN  - 978-3-030-48439-2
SN  - 978-3-030-48438-5
U6  - http://dx.doi.org/10.1007/978-3-030-48439-2_55
N1  - Annual International Conference of the German Operations Research Society (GOR), Dresden, Germany, September 4-6, 2019
SP  - 457
EP  - 463
PB  - Springer
CY  - Cham
ER  - 
TY  - JOUR
A1  - Leise, Philipp
A1  - Eßer, Arved
A1  - Eichenlaub, Tobias
A1  - Schleiffer, Jean-Eric
A1  - Altherr, Lena
A1  - Rinderknecht, Stephan
A1  - Pelz, Peter F.
T1  - Sustainable system design of electric powertrains - comparison of optimization methods
JF  - Engineering Optimization
N2  - The transition within transportation towards battery electric vehicles can lead to a more sustainable future. To account for the development goal ‘climate action’ stated by the United Nations, it is mandatory, within the conceptual design phase, to derive energy-efficient system designs. One barrier is the uncertainty of the driving behaviour within the usage phase. This uncertainty is often addressed by using a stochastic synthesis process to derive representative driving cycles and by using cycle-based optimization. To deal with this uncertainty, a new approach based on a stochastic optimization program is presented. This leads to an optimization model that is solved with an exact solver. It is compared to a system design approach based on driving cycles and a genetic algorithm solver. Both approaches are applied to find efficient electric powertrains with fixed-speed and multi-speed transmissions. Hence, the similarities, differences and respective advantages of each optimization procedure are discussed.
KW  - Powertrain
KW  - stochastic optimization
KW  - global optimization
KW  - genetic algorithm
Y1  - 2021
U6  - http://dx.doi.org/10.1080/0305215X.2021.1928660
SN  - 0305-215X
PB  - Taylor & Francis
CY  - London
ER  - 
TY  - CHAP
A1  - Leise, Philipp
A1  - Breuer, Tim
A1  - Altherr, Lena
A1  - Pelz, Peter F.
T1  - Development, validation and assessment of a resilient pumping system
T2  - Proceedings of the Joint International Resilience Conference, JIRC2020
N2  - The development of resilient technical systems is a challenging task, as the system should adapt automatically to unknown disturbances and component failures. To evaluate different approaches for deriving resilient technical system designs, we developed a modular test rig that is based on a pumping system. On the basis of this example
system, we present metrics to quantify resilience and an algorithmic approach to improve resilience. This approach enables the pumping system to automatically react on unknown disturbances and to reduce the impact of component failures. In this case, the system is able to automatically adapt its topology by activating additional valves. This enables the system to still reach a minimum performance, even in case of failures. Furthermore, timedependent disturbances are evaluated continuously, deviations from the original state are automatically detected and anticipated in the future. This allows to reduce the impact of future disturbances and leads to a more resilient
system behaviour.
KW  - water supply system
KW  - fault detection
KW  - anticipation strategy
Y1  - 2020
SN  - 978-90-365-5095-6
N1  - Proceedings of the Joint International Resilience Conference 2020.
Interconnected: Resilience Innovations for Sustainable Development Goals. 23 - 27 November, 2020
SP  - 97
EP  - 100
ER  - 
TY  - CHAP
A1  - Leise, Philipp
A1  - Altherr, Lena
A1  - Simon, Nicolai
A1  - Pelz, Peter F.
T1  - Finding global-optimal gearbox designs for battery electric vehicles
T2  - Optimization of complex systems - theory, models, algorithms and applications : WCGO 2019
N2  - 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.
KW  - Powertrain
KW  - Gearbox
KW  - Optimization
KW  - BEV
KW  - WLTP
Y1  - 2019
SN  - 978-3-030-21802-7
U6  - http://dx.doi.org/10.1007/978-3-030-21803-4_91
SP  - 916
EP  - 925
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Leise, Philipp
A1  - Altherr, Lena
A1  - Pelz, Peter F.
T1  - Technical Operations Research (TOR) - Algorithms, not Engineers, Design Optimal Energy Efficient and Resilient Cooling Systems
T2  - FAN2018 - Proceedings of the International Conference on Fan Noise, Aerodynamics, Applications and Systems
N2  - The overall energy efficiency of ventilation systems can be improved by considering not only single components, but by considering as well the interplay between every part of the system. With the help of the method "TOR" ("Technical Operations Research"), which was developed at the Chair of Fluid Systems at TU Darmstadt, it is possible to improve the energy efficiency of the whole system by considering all possible design choices programmatically. We show the ability of this systematic design approach with a ventilation system for buildings as a use case example.
Based on a Mixed-Integer Nonlinear Program (MINLP) we model the ventilation system. We use binary variables to model the selection of different pipe diameters. Multiple fans are model with the help of scaling laws. The whole system is represented by a graph, where the edges represent the pipes and fans and the nodes represents the source of air for cooling and the sinks, that have to be cooled. At the beginning, the human designer chooses a construction kit of different suitable fans and pipes of different diameters and different load cases. These boundary conditions define a variety of different possible system topologies. It is not possible to consider all topologies by hand. With the help of state of the art solvers, on the other side, it is possible to solve this MINLP.
Next to this, we also consider the effects of malfunctions in different components. Therefore, we show a first approach to measure the resilience of the shown example use case. Further, we compare the conventional approach with designs that are more resilient. These more resilient designs are derived by extending the before mentioned model with further constraints, that consider explicitly the resilience of the overall system. We show that it is possible to design resilient systems with this method already in the early design stage and compare the energy efficiency and resilience of these different system designs.
Y1  - 2018
N1  - International Conference on Fan Noise, Aerodynamics, Applications and Systems 
18-20.04.2018
Darmstadt, Deutschland
SP  - 1
EP  - 12
ER  - 
TY  - CHAP
A1  - Leise, Philipp
A1  - Altherr, Lena
A1  - Pelz, Peter F.
T1  - Energy-Efficient design of a water supply system for skyscrapers by mixed-integer nonlinear programming
T2  - Operations Research Proceedings 2017
N2  - The energy-efficiency of technical systems can be improved by a systematic design approach. Technical Operations Research (TOR) employs methods known from Operations Research to find a global optimal layout and operation strategy of technical systems. We show the practical usage of this approach by the systematic design of a decentralized water supply system for skyscrapers. All possible network options and operation strategies are modeled by a Mixed-Integer Nonlinear Program. We present the optimal system found by our approach and highlight the energy savings compared to a conventional system design.
KW  - Engineering optimization
KW  - Global optimization
KW  - Energy efficiency
KW  - Water
KW  - Network
Y1  - 2018
SN  - 978-3-319-89919-0
U6  - http://dx.doi.org/10.1007/978-3-319-89920-6_63
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Leise, Philipp
A1  - Altherr, Lena
T1  - Optimizing the design and control of decentralized water supply systems – a case-study of a hotel building
T2  - EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization
N2  - To increase pressure to supply all floors of high buildings with water, booster stations, normally consisting of several parallel pumps in the basement, are used. In this work, we demonstrate the potential of a decentralized pump topology regarding energy savings in water supply systems of skyscrapers. We present an approach, based on Mixed-Integer Nonlinear Programming, that allows to choose an optimal network topology and optimal pumps from a predefined construction kit comprising different pump types. Using domain-specific scaling laws and Latin Hypercube Sampling, we generate different input sets of pump types and compare their impact on the efficiency and cost of the total system design. As a realistic application example, we consider a hotel building with 325 rooms, 12 floors and up to four pressure zones.
KW  - Engineering optimization
KW  - Energy efficiency
KW  - Water
KW  - Pump System
KW  - Latin Hypercube Sampling
Y1  - 2018
SN  - 978-3-319-97773-7
SN  - 978-3-319-97772-0
U6  - http://dx.doi.org/10.1007/978-3-319-97773-7_107
N1  - EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization. 17-19 September 2018. Lisboa, Portugal
SP  - 1241
EP  - 1252
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Leise, Philipp
A1  - Altherr, Lena
T1  - Experimental evaluation of resilience metrics in a fluid system
T2  - Mastering Uncertainty in Mechanical Engineering
Y1  - 2021
SN  - 978-3-030-78356-3
N1  - Unterkapitel des Kapitels "Strategies for Mastering Uncertainty"
SP  - 442
EP  - 447
PB  - Springer
CY  - Cham
ER  -