@article{Mayer1988, author = {Mayer, Claudia}, title = {Von »Unterbrechungen« und »Engf{\"u}hrungen«. Lyrik und Prosa in Butt und R{\"a}ttin}, series = {G{\"u}nter Grass}, journal = {G{\"u}nter Grass}, publisher = {Ed. Text + Kritik}, address = {M{\"u}nchen}, isbn = {3-88377-285-2}, pages = {84 -- 92}, year = {1988}, language = {de} } @article{Mayer1996, author = {Mayer, Claudia}, title = {Danach ging das Leben weiter : Macht und Gewalt im Geschlechterkampf bei G{\"u}nter Grass. Mayer-Iswandy, Claudia}, series = {Alte Welten - neue Welten : Akten des IX. Kongresses der Internationalen Vereinigung f{\"u}r germanische Sprach- und Literaturwissenschaft (IVG) ; [Akten des IX. Internationalen Germanisten-Kongresses, Vancouver 1995] / hrsg. von Michael S. Batts. Bd. 2: Abstracts}, journal = {Alte Welten - neue Welten : Akten des IX. Kongresses der Internationalen Vereinigung f{\"u}r germanische Sprach- und Literaturwissenschaft (IVG) ; [Akten des IX. Internationalen Germanisten-Kongresses, Vancouver 1995] / hrsg. von Michael S. Batts. Bd. 2: Abstracts}, publisher = {Niemeyer}, address = {T{\"u}bingen}, isbn = {3-484-10716-2}, pages = {37}, year = {1996}, language = {de} } @article{Mayer2007, author = {Mayer, Claudia}, title = {Internet statt Zeitung? Nein, Internet und Zeitung!}, series = {Aachener Zeitung. 08.01.2007 (2007)}, journal = {Aachener Zeitung. 08.01.2007 (2007)}, year = {2007}, language = {de} } @article{Mayer2006, author = {Mayer, Claudia}, title = {Die Lebensbeichte des G{\"u}nter Grass}, series = {Aachener Zeitung. 28.12.2006 (2006)}, journal = {Aachener Zeitung. 28.12.2006 (2006)}, pages = {8}, year = {2006}, language = {de} } @article{Mayer2006, author = {Mayer, Claudia}, title = {Die Beichte eines Mahners an seinem Lebensabend. Das sp{\"a}te Bekenntnis des G{\"u}nter Grass. Analysierende R{\"u}ckschau auf sein SS-Eingest{\"a}ndnis}, series = {Aachener Nachrichten. 28.12.2006 (2006)}, journal = {Aachener Nachrichten. 28.12.2006 (2006)}, pages = {8}, year = {2006}, language = {de} } @article{Mayer2008, author = {Mayer, Claudia}, title = {Meine besten Rezepte}, series = {Kinder, Karriere, Kochvergn{\"u}gen : Prominente Aachenerinnen verraten ihre besten Rezepte / Hrsg. von Claudia Dechamps . Fotos: Harald Kr{\"o}mer}, journal = {Kinder, Karriere, Kochvergn{\"u}gen : Prominente Aachenerinnen verraten ihre besten Rezepte / Hrsg. von Claudia Dechamps . Fotos: Harald Kr{\"o}mer}, publisher = {Corporate Publishing Claudia Dechamps}, address = {Aachen}, pages = {30 -- 33}, year = {2008}, language = {de} } @article{Mayer2011, author = {Mayer, Claudia}, title = {Das globale Dorf ist sein bekanntes Schlagwort}, series = {Aachener Nachrichten}, journal = {Aachener Nachrichten}, number = {27.12.2011}, pages = {12 -- 12}, year = {2011}, language = {de} } @incollection{Mayer2013, author = {Mayer, Claudia}, title = {Innovation und Kommunikation}, series = {Innovation durch Kooperation : wie der Mittelstand durch Zusammenarbeit mit den Hochschulen seine Wettbewerbsf{\"a}higkeit steigert : Festschrift f{\"u}r Prof. Dr. rer. nat. Johannes Gartzen / Thomas Gartzen, Ute Gartzen (Hrsg.)}, booktitle = {Innovation durch Kooperation : wie der Mittelstand durch Zusammenarbeit mit den Hochschulen seine Wettbewerbsf{\"a}higkeit steigert : Festschrift f{\"u}r Prof. Dr. rer. nat. Johannes Gartzen / Thomas Gartzen, Ute Gartzen (Hrsg.)}, publisher = {Apprimus Verlag}, address = {Aachen}, isbn = {978-3-86359-136-6}, pages = {145 -- 149}, year = {2013}, language = {de} } @article{MausHoefkenSchuba2011, author = {Maus, Stefan and H{\"o}fken, Hans-Wilhelm and Schuba, Marko}, title = {Forensic Analysis of Geodata in Android Smartphones}, pages = {1 -- 11}, year = {2011}, language = {en} } @inproceedings{MatareSchifferFerrein2019, author = {Matar{\´e}, Victor and Schiffer, Stefan and Ferrein, Alexander}, title = {golog++ : An integrative system design}, series = {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}, booktitle = {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}, editor = {Steinbauer, Gerald and Ferrein, Alexander}, issn = {1613-0073}, pages = {29 -- 35}, year = {2019}, language = {en} } @inproceedings{MarcoFerrein2017, author = {Marco, Heather G. and Ferrein, Alexander}, title = {AGNES: The African-German Network of Excellence in Science}, series = {Proceedings of the 2nd Developing World Robotics Forum, Workshop at IEEE AFRICON 2017}, booktitle = {Proceedings of the 2nd Developing World Robotics Forum, Workshop at IEEE AFRICON 2017}, pages = {1 -- 2}, year = {2017}, language = {en} } @inproceedings{MaikeLenzWolf2014, author = {Maike, M{\"u}ller and Lenz, Laura and Wolf, Martin}, title = {Steigerung der Effektivit{\"a}t durch Prozessmodellierungs-Tools - {\"A}nderbarkeit und Transparenz von Prozessen am Beispiel der Business Simulation Apollo 13}, series = {Informatik 2014}, booktitle = {Informatik 2014}, publisher = {Gesellschaft f{\"u}r Informatik e.V.}, address = {Bonn}, isbn = {978-3-88579-626-8}, issn = {1617-5468}, pages = {357 -- 369}, year = {2014}, abstract = {Die Nutzung von Prozessmodellierungsmethoden oder - werkzeugen kann erheblichen Einfluss auf die Effektivit{\"a}t von Prozessen haben. Das gilt insbesondere f{\"u}r Situationen, in denen Personen unter Stress stehen oder unge{\"u}bt sind. In diesen F{\"a}llen geben Prozessmodelle konkrete Empfehlungen, nach denen sich die handelnden Personen richten k{\"o}nnten. In Experimenten mit der Business-Simulation Apollo 13 haben wir den Effekt eines Einsatzes von Prozessmodellierungsmethoden und -werkzeugen untersucht. Bereits bekannte Theorien (z.B. {\"u}ber geeignete Verh{\"a}ltnisse von Kommunikationsinhalten) konnten best{\"a}tigt werden. Dar{\"u}ber hinaus haben wir eine besondere Bedeutung der {\"U}bertragbarkeit von Prozessmodellen in konkrete Handlungen identifiziert.}, language = {de} } @book{MaiSchumnyAlt1984, author = {Mai, Herbert and Schumny, Harald and Alt, Helmut}, title = {Lineares Optimieren : Maximierung - Minimierung (Vieweg Programmbibliothek Mikrocomputer ; 14) / Helmut Alt ; Harald Schumny [Hrsg.]}, publisher = {Vieweg + Teubner}, address = {Wiesbaden}, isbn = {978-3-663-14049-8 ; 978-3-528-04312-4}, pages = {VIII, 100 S.}, year = {1984}, language = {de} } @article{MaasVosLagemaatetal.2014, author = {Maas, Marnix C. and Vos, Eline K. and Lagemaat, Miriam W. and Bitz, Andreas and Orzada, Stephan and Kobus, Thiele and Kraff, Oliver and Maderwald, Stefan and Ladd, Mark E. and Scheenen, Tom W. J.}, title = {Feasibility of T₂-weighted turbo spin echo imaging of the human prostate at 7 tesla}, series = {Magnetic Resonance in Medicine}, volume = {71}, journal = {Magnetic Resonance in Medicine}, number = {5}, publisher = {Wiley-VCH}, address = {Weinheim}, issn = {1522-2594}, doi = {10.1002/mrm.24818}, pages = {1711 -- 1719}, year = {2014}, abstract = {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.}, language = {en} } @inproceedings{LuszczynskiEngels2012, author = {Luszczynski, K. and Engels, Elmar}, title = {Vergleichende Untersuchung zur Topologie von zelloptimalen, elektromobilit{\"a}ts-optimierten Ladungsausgleichsvorrichtungen}, series = {Tagungsband zur AALE-Tagung 2012 : 9. Fachkonferenz}, booktitle = {Tagungsband zur AALE-Tagung 2012 : 9. Fachkonferenz}, publisher = {Oldenbourg Industrieverlag}, address = {M{\"u}nchen}, isbn = {978-3-8356-3305-6}, pages = {165 -- 174}, year = {2012}, language = {de} } @incollection{LuczakWolfSchlicketal.1999, author = {Luczak, Holger and Wolf, Martin and Schlick, Christopher and Springer, J. and Foltz, Christian}, title = {Personenorientierte Arbeitsprozesse und Kommunikationsforrnen}, series = {Integration von Entwicklungssystemen in Ingenieuranwendungen : substantielle Verbesserung der Entwicklungsprozesse}, booktitle = {Integration von Entwicklungssystemen in Ingenieuranwendungen : substantielle Verbesserung der Entwicklungsprozesse}, editor = {Nagl, Walter}, publisher = {Springer}, address = {Berlin}, isbn = {3-540-63920-9}, pages = {403 -- 422}, year = {1999}, language = {de} } @incollection{LuczakWolfMuehlfelder2001, author = {Luczak, Holger and Wolf, Martin and M{\"u}hlfelder, M.}, title = {Arbeitswissenschaft}, series = {CSCW-Kompendium : Lehr- und Handbuch zum computerunterst{\"u}tzten kooperativen Arbeiten ; mit 9 Tabellen}, booktitle = {CSCW-Kompendium : Lehr- und Handbuch zum computerunterst{\"u}tzten kooperativen Arbeiten ; mit 9 Tabellen}, editor = {Schwabe, Gerhard}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-540-67552-5}, doi = {10.1007/978-3-642-56848-0_2}, pages = {7 -- 14}, year = {2001}, abstract = {Unter Arbeit wird das T{\"a}tigsein des Menschen verstanden, bei dem dieser mit anderen Menschen und (technischen) Hilfsmitteln in Interaktion tritt, um unter wirtschaftlichen Zielsetzungen G{\"u}ter 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 T{\"a}tigseins neben anderen wie Spiel, Sport, Lemen usw.}, language = {de} } @inproceedings{LorenzAltherrPelz2019, author = {Lorenz, Imke-Sophie B. and Altherr, Lena and Pelz, Peter F.}, title = {Graph-theoretic resilience analysis of a water distribution system's topology}, series = {World Congress on Resilience, Reliability and Asset Management 2019}, booktitle = {World Congress on Resilience, Reliability and Asset Management 2019}, pages = {106 -- 109}, year = {2019}, abstract = {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}, language = {en} } @inproceedings{LorenzAltherrPelz2020, author = {Lorenz, Imke-Sophie and Altherr, Lena and Pelz, Peter F.}, title = {Assessing and Optimizing the Resilience of Water Distribution Systems Using Graph-Theoretical Metrics}, series = {Operations Research Proceedings 2019}, booktitle = {Operations Research Proceedings 2019}, editor = {Neufeld, Janis S. and Buscher, Udo and Lasch, Rainer and M{\"o}st, Dominik and Sch{\"o}nberger, J{\"o}rn}, publisher = {Springer}, address = {Cham}, isbn = {978-3-030-48439-2}, doi = {10.1007/978-3-030-48439-2_63}, pages = {521 -- 527}, year = {2020}, abstract = {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.}, language = {en} } @inproceedings{LorenzAltherrPelz2020, author = {Lorenz, Imke-Sophie and Altherr, Lena and Pelz, Peter F.}, title = {Resilience enhancement of critical infrastructure - graph-theoretical resilience analysis of the water distribution system in the German city of Darmstadt}, series = {14th WCEAM Proceedings}, booktitle = {14th WCEAM Proceedings}, publisher = {Springer}, address = {Cham}, isbn = {978-3-030-64228-0}, doi = {10.1007/978-3-030-64228-0_13}, pages = {137 -- 149}, year = {2020}, abstract = {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.}, language = {en} } @book{LohrDeppe2001, author = {Lohr, J{\"u}rgen and Deppe, Andreas}, title = {Der CMS-Guide : Content-Management-Systeme: Erfolgsfaktoren, Gesch{\"a}ftsmodelle, Produkt{\"u}bersicht}, publisher = {Vieweg}, address = {Braunschweig [u.a.]}, isbn = {3-528-05768-8}, pages = {XV, 201 S. : graph. Darst.}, year = {2001}, language = {de} } @book{Lohr1998, author = {Lohr, J{\"u}rgen}, title = {Probleme und L{\"o}sungen von Multimedia-Diensten und interaktiven Kommunikationsdiensten im nationalen und internationalen Umfeld}, publisher = {VDI-Verl.}, address = {D{\"u}sseldorf}, isbn = {3-18-356410-6}, pages = {X, 277 S.: graph. Darst.}, year = {1998}, language = {de} } @book{Lohr2009, author = {Lohr, J{\"u}rgen}, title = {High Definition Media Services : Zukunft des Rundfunks im Internet: Technologien und Anwendungsperspektiven}, publisher = {Schiele \& Sch{\"o}n}, address = {Berlin}, isbn = {978-3-7949-0789-2}, pages = {216 S. : Ill., graph. Darst.}, year = {2009}, language = {de} } @inproceedings{LogenHoefkenSchuba2012, author = {Logen, Steffen and H{\"o}fken, Hans and Schuba, Marko}, title = {Simplifying RAM Forensics : A GUI and Extensions for the Volatility Framework}, series = {2012 Seventh International Conference on Availability, Reliability and Security (ARES), 20-24 August 2012, Prague, Czech Republic}, booktitle = {2012 Seventh International Conference on Availability, Reliability and Security (ARES), 20-24 August 2012, Prague, Czech Republic}, publisher = {IEEE}, address = {New York}, isbn = {978-1-4673-2244-7}, doi = {10.1109/ARES.2012.12}, pages = {620 -- 624}, year = {2012}, abstract = {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.}, language = {en} } @inproceedings{LindnerKolbRingbeck2008, author = {Lindner, Marvin and Kolb, Andreas and Ringbeck, Thorsten}, title = {New insights into the calibration of ToF-sensors}, series = {2008 IEEE Computer Society Conference on Computer Vision and Pattern Recognition workshops : Anchorage, AK, 23 - 28 June 2008}, booktitle = {2008 IEEE Computer Society Conference on Computer Vision and Pattern Recognition workshops : Anchorage, AK, 23 - 28 June 2008}, publisher = {IEEE Service Center}, address = {Piscataway, NJ}, isbn = {978-1-4244-2339-2}, pages = {1 -- 5}, year = {2008}, abstract = {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.}, language = {en} } @inproceedings{LindenlaufHoefkenSchuba2015, author = {Lindenlauf, Simon and H{\"o}fken, Hans-Wilhelm and Schuba, Marko}, title = {Cold Boot Attacks on DDR2 and DDR3 SDRAM}, series = {10th International Conference on Availability, Reliability and Security (ARES) 2015}, booktitle = {10th International Conference on Availability, Reliability and Security (ARES) 2015}, doi = {10.1109/ARES.2015.28}, pages = {287 -- 292}, year = {2015}, language = {en} } @article{LimpertWiesenFerreinetal.2019, author = {Limpert, Nicolas and Wiesen, Patrick and Ferrein, Alexander and Kallweit, Stephan and Schiffer, Stefan}, title = {The ROSIN Project and its Outreach to South Africa}, series = {R\&D Journal}, volume = {35}, journal = {R\&D Journal}, pages = {1 -- 6}, year = {2019}, language = {en} } @inproceedings{LimpertSchifferFerrein2015, author = {Limpert, Nicolas and Schiffer, Stefan and Ferrein, Alexander}, title = {A Local Planner for Ackermann-Driven Vehicles in ROS SBPL}, series = {Proceedings of the International Conference on Pattern Recognition Association of South Africa and Robotics and Mechatronics (PRASA-RobMech), 2015}, booktitle = {Proceedings of the International Conference on Pattern Recognition Association of South Africa and Robotics and Mechatronics (PRASA-RobMech), 2015}, doi = {10.1109/RoboMech.2015.7359518}, pages = {172 -- 177}, year = {2015}, language = {en} } @techreport{LessenichRitzWallenborn2014, author = {Leßenich, Nina and Ritz, Thomas and Wallenborn, Ramona}, title = {Prototyping zur Verbesserung der Benutzerfreundlichkeit mobiler Software : Potenziale benutzerfreundlicher Software-Entwicklung ; Info-Brosch{\"u}re}, publisher = {eBusiness-Lotse}, address = {Aachen}, pages = {7 S. : Ill., graph. Darst.}, year = {2014}, abstract = {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 m{\"o}glichst hohe Gebrauchstauglichkeit, auch Usability genannt, notwendig. Die Informationsbrosch{\"u}re „Prototyping zur Verbesserung der Benutzerfreundlichkeit mobiler Software" richtet sich an Personen, die an der Gestaltung und entwicklung von (mobiler) Software beteiligt sind. In dieser Brosch{\"u}re werden m{\"o}gliche Potenziale im Bereich einer effizienten und benutzerzentrierten Software-Entwicklung aufgezeigt.}, language = {de} } @article{LerchlKruegerNiehausetal.2008, author = {Lerchl, Alexander and Kr{\"u}ger, Heike and Niehaus, Michael and Streckert, Joachim R. and Bitz, Andreas and Hansen, Volkert}, title = {Effects of mobile phone electromagnetic fields at nonthermal SAR values on melatonin and body weight of Djungarian hamsters (Phodopus sungorus)}, series = {Journal of Pineal Research}, volume = {44}, journal = {Journal of Pineal Research}, number = {3}, issn = {1600-079X}, doi = {10.1111/j.1600-079X.2007.00522.x}, pages = {267 -- 272}, year = {2008}, language = {en} } @article{LepersRakePuetter1976, author = {Lepers, Heinrich and Rake, H. and P{\"u}tter, L.}, title = {Regelung der Qualitaet beim Brennen von Zementklinker}, series = {Regelungstechnische Praxis : rtp}, volume = {18}, journal = {Regelungstechnische Praxis : rtp}, number = {4}, publisher = {Oldenbourg}, address = {M{\"u}nchen}, issn = {0340-4730}, pages = {87 -- 91}, year = {1976}, language = {de} } @article{LepersRakePuetter1976, author = {Lepers, Heinrich and Rake, H. and P{\"u}tter, L.}, title = {Prozeßrechnerautomatisierung von W{\"a}rmeprozessen in der Grundstoffindustrie}, series = {Industrie-Anzeiger}, volume = {98}, journal = {Industrie-Anzeiger}, number = {17/18}, publisher = {Konradin}, address = {Leinfelden-Echterdingen}, issn = {0019-9036}, pages = {286 -- 289}, year = {1976}, language = {de} } @article{LepersRakePuetter1976, author = {Lepers, Heinrich and Rake, H. and P{\"u}tter, L.}, title = {Prozeßrechnerautomatisierung von W{\"a}rmeprozessen}, series = {Elektro-Anzeiger}, volume = {29}, journal = {Elektro-Anzeiger}, number = {5}, publisher = {Konradin}, address = {Leinfelden-Echterdingen}, issn = {0013-5518}, pages = {98 -- 101}, year = {1976}, language = {de} } @article{LepersJaegerPuetter1977, author = {Lepers, Heinrich and J{\"a}ger, G. and P{\"u}tter, L.}, title = {Anwendung eines Prozessmodells zur Regelung der Produktqualit{\"a}t bei der Zementklinker-Herstellung / Jaeger, G. ; Lepers, H. Puetter, L. [u.a.]}, series = {VDI-Berichte (1977)}, journal = {VDI-Berichte (1977)}, pages = {87 -- 93}, year = {1977}, language = {de} } @book{Lepers2005, author = {Lepers, Heinrich}, title = {SPS-Programmierung nach IEC 61131-3: mit Beispielen CoDeSys und STEP 7 ; [auf 3 CD-ROMs Installationssoftware f{\"u}r CoDeSys und STEP 7 mit CFC, alle Beispiele aus dem Buch f{\"u}r CoDeSys und STEP 7, alle L{\"o}sungen zu den {\"U}bungsprojekten f{\"u}r CoDeSys und STEP 7]}, publisher = {Franzis}, address = {Poing}, isbn = {3-7723-5801-2}, pages = {350 S.; Ill., graph. Darst.}, year = {2005}, language = {de} } @article{Lepers1972, author = {Lepers, Heinrich}, title = {Integrationsverfahren zur Systemidentifizierung aus gemessenen Systemantworten}, series = {Regelungstechnik}, volume = {20}, journal = {Regelungstechnik}, number = {10}, publisher = {Oldenbourg}, address = {M{\"u}nchen}, doi = {10.1524/auto.1972.20.112.417}, pages = {417 -- 422}, year = {1972}, abstract = {F{\"u}r viele Zwecke ist es n{\"u}tzlich, von einem technischen System ein mathematisches Modell zu haben. F{\"u}r Systeme, die sich durch eine Verz{\"o}gerung h{\"o}herer Ordnung mit oder ohne Ausgleich beschreiben lassen, wird ein Identifizierungsverfahren vorgestellt, das aus gemessenen Zeitfunktionen die Bestimmung einer {\"U}bertragungsfunktion erm{\"o}glicht. 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 Leistungsf{\"a}higkeit des Verfahrens.}, language = {de} } @article{Lepers1973, author = {Lepers, Heinrich}, title = {Fehler bei der Systemanalyse aus stochastisch gest{\"o}rten Sprungantworten}, series = {Regelungstechnik und Prozeß-Datenverarbeitung}, volume = {21}, journal = {Regelungstechnik und Prozeß-Datenverarbeitung}, number = {7}, publisher = {De Gruyter}, address = {Berlin}, issn = {0034-3226}, doi = {10.1524/auto.1973.21.112.229}, pages = {229 -- 233}, year = {1973}, abstract = {Es wird von Gleichungen ausgegangen, mit denen die Modellkoeffizienten von Regelstrecken mit Ausgleich aus der gemessenen Sprungantwort ermittelt werden k{\"o}nnen. Die {\"U}bertragungsfunktion der Regelstrecke hat einen konstanten Z{\"a}hler und ein Nennerpolynom. Unter der Annahme, daß die ideale und exakte Sprungantwort des Systems durch ein stochastisches Signal gest{\"o}rt wird, wird untersucht, wie die Fehler der ermittelten Modellkoeffizienten von Kennwerten des St{\"o}rsignals und von der Meßzeit f{\"u}r die Sprungantwort abh{\"a}ngen. Durch eine Simulation auf dem Digitalrechner wurden die Ergebnisse kontrolliert. Es zeigt sich, daß durch eine Filterung der gest{\"o}rten Sprungantwort {\"u}ber einen Tiefpaß keine Verbesserung der Analyseergebnisse erreicht werden kann, da das Identifizierungsverfahren eine gl{\"a}ttende Eigenschaft hat.}, language = {de} } @article{Lepers1972, author = {Lepers, Heinrich}, title = {Empfindlichkeitsuntersuchungen zur Beurteilung von Optimierungen mit fehlerhaften Modellen}, series = {Messen, Steuern, Regeln}, volume = {15}, journal = {Messen, Steuern, Regeln}, number = {11}, publisher = {Oldenbourg}, address = {M{\"u}nchen}, issn = {0026-0347}, pages = {407 -- 410}, year = {1972}, language = {de} } @book{Lepers1971, author = {Lepers, Heinrich}, title = {Identifizierung von stochastisch gest{\"o}rten Regelstrecken mit aperiodischen Testsignalen}, pages = {115 S.}, year = {1971}, language = {de} } @book{Lepers2007, author = {Lepers, Heinrich}, title = {SPS-Programmierung nach IEC 61131-3 : mit Beispielen f{\"u}r CoDeSys und STEP 7 / 2. Aufl.}, publisher = {Franzis}, address = {Poing}, isbn = {978-3-7723-5805-0}, pages = {350 S. : Ill., graph. Darst. + 3 CD-ROMs}, year = {2007}, language = {de} } @book{Lepers2009, author = {Lepers, Heinrich}, title = {SPS-Programmierung nach IEC 61131-3 : mit Beispielen f{\"u}r CoDeSys und STEP 7 ; [auf 4 DVDs/CDs: Installationssoftware f{\"u}r CoDeSys, STEP 7 und WINCC flexible ; alle Beispiele aus dem Buch f{\"u}r CoDeSys und STEP7 ; alle L{\"o}sungen zu den {\"U}bungsprojekten f{\"u}r CoDeSys und STEP 7] / Heinrich Lepers . 3. neu bearb. Aufl.}, publisher = {Franzis}, address = {Poing}, isbn = {978-3-7723-5806-7}, pages = {429 S. : Ill., graph. Darst.}, year = {2009}, language = {de} } @inproceedings{LenzWolf2014, author = {Lenz, Laura L. and Wolf, Martin}, title = {Economic evaluation of serious games with the comparative assessment framework COSEGA}, series = {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}, booktitle = {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}, editor = {Kritz, Willy Christian}, publisher = {Bertelsmann}, address = {[Bielefeld]}, isbn = {978-3-7639-5422-3}, pages = {374 -- 386}, year = {2014}, language = {en} } @inproceedings{LeiseSimonAltherr2020, author = {Leise, Philipp and Simon, Nicolai and Altherr, Lena}, title = {Comparison of Piecewise Linearization Techniques to Model Electric Motor Efficiency Maps: A Computational Study}, series = {Operations Research Proceedings 2019}, booktitle = {Operations Research Proceedings 2019}, publisher = {Springer}, address = {Cham}, isbn = {978-3-030-48439-2}, doi = {10.1007/978-3-030-48439-2_55}, pages = {457 -- 463}, year = {2020}, abstract = {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.}, language = {en} } @article{LeiseEsserEichenlaubetal.2021, author = {Leise, Philipp and Eßer, Arved and Eichenlaub, Tobias and Schleiffer, Jean-Eric and Altherr, Lena and Rinderknecht, Stephan and Pelz, Peter F.}, title = {Sustainable system design of electric powertrains - comparison of optimization methods}, series = {Engineering Optimization}, journal = {Engineering Optimization}, publisher = {Taylor \& Francis}, address = {London}, issn = {0305-215X}, doi = {10.1080/0305215X.2021.1928660}, year = {2021}, abstract = {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.}, language = {en} } @inproceedings{LeiseBreuerAltherretal.2020, author = {Leise, Philipp and Breuer, Tim and Altherr, Lena and Pelz, Peter F.}, title = {Development, validation and assessment of a resilient pumping system}, series = {Proceedings of the Joint International Resilience Conference, JIRC2020}, booktitle = {Proceedings of the Joint International Resilience Conference, JIRC2020}, isbn = {978-90-365-5095-6}, pages = {97 -- 100}, year = {2020}, abstract = {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.}, language = {en} } @incollection{LeiseAltherrSimonetal.2019, author = {Leise, Philipp and Altherr, Lena and Simon, Nicolai and Pelz, Peter F.}, title = {Finding global-optimal gearbox designs for battery electric vehicles}, series = {Optimization of complex systems - theory, models, algorithms and applications : WCGO 2019}, booktitle = {Optimization of complex systems - theory, models, algorithms and applications : WCGO 2019}, publisher = {Springer}, address = {Cham}, isbn = {978-3-030-21802-7}, doi = {10.1007/978-3-030-21803-4_91}, pages = {916 -- 925}, year = {2019}, abstract = {In order to maximize the possible travel distance of battery electric vehicles with one battery charge, it is mandatory to adjust all components of the powertrain carefully to each other. While current vehicle designs mostly simplify the powertrain rigorously and use an electric motor in combination with a gearbox with only one fixed transmission ratio, the use of multi-gear systems has great potential. First, a multi-speed system is able to improve the overall energy efficiency. Secondly, it is able to reduce the maximum momentum and therefore to reduce the maximum current provided by the traction battery, which results in a longer battery lifetime. In this paper, we present a systematic way to generate multi-gear gearbox designs that—combined with a certain electric motor—lead to the most efficient fulfillment of predefined load scenarios and are at the same time robust to uncertainties in the load. Therefore, we model the electric motor and the gearbox within a Mixed-Integer Nonlinear Program, and optimize the efficiency of the mechanical parts of the powertrain. By combining this mathematical optimization program with an unsupervised machine learning algorithm, we are able to derive global-optimal gearbox designs for practically relevant momentum and speed requirements.}, language = {en} } @inproceedings{LeiseAltherrPelz2018, author = {Leise, Philipp and Altherr, Lena and Pelz, Peter F.}, title = {Technical Operations Research (TOR) - Algorithms, not Engineers, Design Optimal Energy Efficient and Resilient Cooling Systems}, series = {FAN2018 - Proceedings of the International Conference on Fan Noise, Aerodynamics, Applications and Systems}, booktitle = {FAN2018 - Proceedings of the International Conference on Fan Noise, Aerodynamics, Applications and Systems}, pages = {1 -- 12}, year = {2018}, abstract = {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.}, language = {en} } @incollection{LeiseAltherrPelz2018, author = {Leise, Philipp and Altherr, Lena and Pelz, Peter F.}, title = {Energy-Efficient design of a water supply system for skyscrapers by mixed-integer nonlinear programming}, series = {Operations Research Proceedings 2017}, booktitle = {Operations Research Proceedings 2017}, publisher = {Springer}, address = {Cham}, isbn = {978-3-319-89919-0}, doi = {10.1007/978-3-319-89920-6_63}, year = {2018}, abstract = {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.}, language = {en} } @inproceedings{LeiseAltherr2018, author = {Leise, Philipp and Altherr, Lena}, title = {Optimizing the design and control of decentralized water supply systems - a case-study of a hotel building}, series = {EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization}, booktitle = {EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization}, publisher = {Springer}, address = {Cham}, isbn = {978-3-319-97773-7}, doi = {10.1007/978-3-319-97773-7_107}, pages = {1241 -- 1252}, year = {2018}, abstract = {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.}, language = {en} } @incollection{LeiseAltherr2021, author = {Leise, Philipp and Altherr, Lena}, title = {Experimental evaluation of resilience metrics in a fluid system}, series = {Mastering Uncertainty in Mechanical Engineering}, booktitle = {Mastering Uncertainty in Mechanical Engineering}, publisher = {Springer}, address = {Cham}, isbn = {978-3-030-78356-3}, pages = {442 -- 447}, year = {2021}, language = {en} }