TY  - CHAP
A1  - Zug, Sebastian
A1  - Niemueller, Tim
A1  - Hochgeschwender, Nico
A1  - Seidensticker, Kai
A1  - Seidel, Martin
A1  - Friedrich, Tim
A1  - Neumann, Tobias
A1  - Karras, Ulrich
A1  - Kraetzschmar, Gerhard K.
A1  - Ferrein, Alexander
T1  - An Integration Challenge to Bridge the Gap Among Industry-Inspired RoboCup Leagues
T2  - RoboCup 2016: Robot World Cup XX. RoboCup 2016.
Y1  - 2017
SN  - 978-3-319-68792-6
U6  - http://dx.doi.org/10.1007/978-3-319-68792-6_13
N1  - Lecture Notes in Computer Science, LNCS, Vol 9776
SP  - 157
EP  - 168
PB  - Springer
CY  - Cham
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  - Schiffer, Stefan
A1  - Ferrein, Alexander
T1  - A System Layout for Cognitive Service Robots
T2  - Cognitive Robot Architectures. Proceedings of EUCognition 2016
Y1  - 2017
SN  - 1613-0073
N1  - CEUR-WS Vol-1855
SP  - 44
EP  - 45
ER  - 
TY  - CHAP
A1  - Harzheim, Thomas
A1  - Heuermann, Holger
T1  - Phase Repeatable Synthesizers as a New Harmonic Phase Standard for Nonlinear Network Analysis
T2  - IEEE Transactions on Microwave Theory and Techniques
Y1  - 2018
U6  - http://dx.doi.org/10.1109/TMTT.2018.2817513
SP  - 1
EP  - 8
PB  - IEEE
ER  - 
TY  - CHAP
A1  - Schopp, Christoph
A1  - Heuermann, Holger
A1  - Marso, Michel
T1  - Multiphysical Study of an Atmospheric Microwave Argon Plasma Jet
T2  - IEEE Transactions on Plasma Science
Y1  - 2017
U6  - http://dx.doi.org/10.1109/TPS.2017.2692735
SN  - 1939-9375
VL  - 45
IS  - 6
SP  - 932
EP  - 937
PB  - IEEE
ER  - 
TY  - CHAP
A1  - Stephan, Achim
A1  - Heuermann, Holger
A1  - Prantner, Michael
T1  - Cutting human tissue with novel atmospheric-pressure microwave plasma jet
T2  - 46th European Microwave Conference (EuMC)
Y1  - 2016
SN  - 978-2-87487-043-9
U6  - http://dx.doi.org/10.1109/EuMC.2016.7824490
SP  - 902
EP  - 905
PB  - IEEE
ER  - 
TY  - CHAP
A1  - Scholl, Ingrid
A1  - Suder, Sebastian
A1  - Schiffer, Stefan
T1  - Direct Volume Rendering in Virtual Reality
T2  - Bildverarbeitung für die Medizin 2018
Y1  - 2018
SN  - 978-3-662-56537-7
U6  - http://dx.doi.org/10.1007/978-3-662-56537-7_79
SP  - 297
EP  - 302
PB  - Springer Vieweg
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Alhwarin, Faraj
A1  - Ferrein, Alexander
A1  - Scholl, Ingrid
T1  - CRVM: Circular Random Variable-based Matcher - A Novel Hashing Method for Fast NN Search in High-dimensional Spaces
T2  - Proceedings of the 7th International Conference on Pattern Recognition Applications and Methods, ICPRAM 2018
Y1  - 2018
SN  - 978-989-758-276-9
U6  - http://dx.doi.org/10.5220/0006692802140221
SP  - 214
EP  - 221
ER  - 
TY  - CHAP
A1  - Alhwarin, Faraj
A1  - Schiffer, Stefan
A1  - Ferrein, Alexander
A1  - Scholl, Ingrid
T1  - Optimized KinectFusion Algorithm for 3D Scanning Applications
T2  - Proceedings of the 11th International Joint Conference on Biomedical Engineering Systems and Technologies - Volume 2: BIOIMAGING
Y1  - 2018
SN  - 978-989-758-278-3
U6  - http://dx.doi.org/10.5220/0006594700500057
SP  - 50
EP  - 57
ER  - 
TY  - CHAP
A1  - Hofmann, Till
A1  - Mataré, Victor
A1  - Schiffer, Stefan
A1  - Ferrein, Alexander
A1  - Lakemeyer, Gerhard
T1  - Constraint-based online transformation of abstract plans into executable robot actions
T2  - Proceedings of the 2018 AAAI Spring Symposium on Integrating Representation, Reasoning, Learning, and Execution for Goal Directed Autonomy
Y1  - 2018
SP  - 549
EP  - 553
ER  - 
TY  - CHAP
A1  - Ferrein, Alexander
A1  - Schiffer, Stefan
A1  - Kallweit, Stephan
T1  - The ROSIN Education Concept - Fostering ROS Industrial-Related Robotics Education in Europe
T2  - ROBOT 2017: Third Iberian Robotics Conference
Y1  - 2018
SN  - 978-3-319-70836-2
U6  - http://dx.doi.org/10.1007/978-3-319-70836-2_31
N1  - Advances in Intelligent Systems and Computing, vol 694;
(AISC, volume 694)
SP  - 370
EP  - 381
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Hofmann, Till
A1  - Mataré, Victor
A1  - Neumann, Tobias
A1  - Schönitz, Sebastian
A1  - Henke, Christoph
A1  - Limpert, Nicolas
A1  - Niemueller, Tim
A1  - Ferrein, Alexander
A1  - Jeschke, Sabina
A1  - Lakemeyer, Gerhard
T1  - Enhancing Software and Hardware Reliability for a Successful Participation in the RoboCup Logistics League 2017
Y1  - 2018
SN  - 978-3-030-00308-1
U6  - http://dx.doi.org/10.1007/978-3-030-00308-1_40
N1  - Lecture Notes in Computer Science, vol 11175
SP  - 486
EP  - 497
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Stopforth, Riaan
A1  - Davrajh, Shaniel
A1  - Ferrein, Alexander
T1  - Design considerations of the duo fugam dual rotor UAV
T2  - 2017 Pattern Recognition Association of South Africa and Robotics and Mechatronics (PRASA-RobMech)
Y1  - 2017
SN  - 978-1-5386-2314-5
U6  - http://dx.doi.org/10.1109/RoboMech.2017.8261115
SP  - 7
EP  - 13
ER  - 
TY  - CHAP
A1  - Essingholt, Felix
A1  - Meyer, Frederic
A1  - Kuhn, Peter
A1  - Schmidt, Philip
A1  - Benkner, Thorsten
A1  - Grabmaier, Anton
T1  - Non-invasive heart beat measurement using microwave resonators
T2  - Proceedings, Vol. 2, Eurosensors 2018 Conference, Graz, Austria, 9–12 September 2018
Y1  - 2018
U6  - http://dx.doi.org/10.3390/proceedings2131002
SN  - 2504-3900
SP  - 1002
PB  - MDPI
CY  - Basel
ER  - 
TY  - CHAP
A1  - Bindzus, Manuel
A1  - Bragard, Michael
T1  - Motivating Intuitive Understanding of the Switched Reluctance Machine in the Education of Undergraduate Students
T2  - 2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)
Y1  - 2018
SN  - 978-1-5386-6903-7
U6  - http://dx.doi.org/10.1109/RTUCON.2018.8659870
SP  - 1
EP  - 6
ER  - 
TY  - CHAP
A1  - Bragard, Michael
A1  - Hoek, Hauke van
A1  - Hoegen, Anne von
A1  - Doncker, Rik W. De
T1  - Motivation-based Learning: Teaching Fundamentals of Electrical Engineering with an LED Spinning Top
T2  - 2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)
Y1  - 2018
SN  - 978-1-5386-6903-7
U6  - http://dx.doi.org/10.1109/RTUCON.2018.8659810
SP  - 1
EP  - 6
ER  - 
TY  - CHAP
A1  - Rütters, René
A1  - Weinheimer, Marius
A1  - Bragard, Michael
T1  - Teaching Control Theory with a Simplified Helicopter Model and a Classroom Fitting Hardware Test-Bench
T2  - 2018 IEEE 59th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)
Y1  - 2018
SN  - 978-1-5386-6903-7
U6  - http://dx.doi.org/10.1109/RTUCON.2018.8659871
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  - Serror, Martin
A1  - Henze, Martin
A1  - Hack, Sacha
A1  - Schuba, Marko
A1  - Wehrle, Klaus
T1  - Towards in-network security for smart homes
T2  - 13th International Conference on Availability, Reliability and Security, ARES 2018; Hamburg; Germany; 27 August 2018 through 30 August 2018
Y1  - 2018
SN  - 978-145036448-5
U6  - http://dx.doi.org/10.1145/3230833.3232802
SP  - Article numer 3232802
ER  - 
TY  - CHAP
A1  - Alhwarin, Faraj
A1  - Ferrein, Alexander
A1  - Scholl, Ingrid
T1  - An Efficient Hashing Algorithm for NN Problem in HD Spaces
T2  - Lecture Notes in Computer Science
Y1  - 2019
SN  - 978-303005498-4
U6  - http://dx.doi.org/10.1007/978-3-030-05499-1_6
N1  - 7th International Conference on Pattern Recognition Applications and Methods, ICPRAM 2018; Funchal; Portugal; 16 January 2018 through 18 January 2018; Code 222779
SP  - 101
EP  - 115
ER  - 
TY  - CHAP
A1  - Scholl, Ingrid
A1  - Bartella, Alex
A1  - Moluluo, Cem
A1  - Ertural, Berat
A1  - Laing, Frederic
A1  - Suder, Sebastian
T1  - MedicVR : Acceleration and Enhancement Techniques for Direct Volume Rendering in Virtual Reality
T2  - Bildverarbeitung für die Medizin 2019 : Algorithmen – Systeme – Anwendungen
Y1  - 2019
SN  - 978-3-658-25326-4
U6  - http://dx.doi.org/10.1007/978-3-658-25326-4_32
SP  - 152
EP  - 157
PB  - Springer Vieweg
CY  - Wiesbaden
ER  - 
TY  - CHAP
A1  - Ferrein, Alexander
A1  - Scholl, Ingrid
A1  - Neumann, Tobias
A1  - Krückel, Kai
A1  - Schiffer, Stefan
T1  - A system for continuous underground site mapping and exploration
Y1  - 2019
U6  - http://dx.doi.org/10.5772/intechopen.85859
ER  - 
TY  - CHAP
A1  - Ferrein, Alexander
A1  - Bharatheesha, Mukunda
A1  - Schiffer, Stefan
A1  - Corbato, Carlos Hernandez
T1  - TRROS 2018 :  Teaching Robotics with ROS Workshop at ERF 2018;  Proceedings of the Workshop on Teaching Robotics with ROS (held at ERF 2018), co-located with European Robotics Forum 2018 (ERF 2018), Tampere, Finland, March 15th, 2018
T2  - CEUR Workshop Proceedings
Y1  - 2019
SN  - 1613-0073
IS  - Vol-2329
ER  - 
TY  - CHAP
A1  - Galdi, Chiara
A1  - Hartung, Frank
A1  - Dugelay, Jean-Luc
T1  - Socrates: A database of realistic data for source camera recognition on smartphones
T2  - Proceedings of the 8th International Conference on Pattern Recognition Applications and Methods - Volume 1: ICPRAM
Y1  - 2019
SN  - 978-989-758-351-3
U6  - http://dx.doi.org/10.5220/0007403706480655
SP  - 648
EP  - 655
ER  - 
TY  - CHAP
A1  - Alhwarin, Faraj
A1  - Schiffer, Stefan
A1  - Ferrein, Alexander
A1  - Scholl, Ingrid
T1  - An Optimized Method for 3D Body Scanning Applications Based on KinectFusion
T2  - Communications in Computer and Information Science
Y1  - 2019
U6  - http://dx.doi.org/10.1007/978-3-030-29196-9_6
SN  - 1865-0929
N1  - 11th International Joint Conference on Biomedical Engineering Systems and Technologies, BIOSTEC 2018; Funchal; Portugal; 19 January 2018 through 21 January 2018
VL  - 1024
SP  - 100
EP  - 113
PB  - Springer
ER  - 
TY  - CHAP
A1  - Eltester, Niklas Sebastian
A1  - Ferrein, Alexander
A1  - Schiffer, Stefan
T1  - A smart factory setup based on the RoboCup logistics league
T2  - 2020 IEEE Conference on Industrial Cyberphysical Systems (ICPS)
N2  - In this paper we present SMART-FACTORY, a setup for a research and teaching facility in industrial robotics that is based on the RoboCup Logistics League. It is driven by the need for developing and applying solutions for digital production. Digitization receives constantly increasing attention in many areas, especially in industry. The common theme is to make things smart by using intelligent computer technology. Especially in the last decade there have been many attempts to improve existing processes in factories, for example, in production logistics, also with deploying cyber-physical systems. An initiative that explores challenges and opportunities for robots in such a setting is the RoboCup Logistics League. Since its foundation in 2012 it is an international effort for research and education in an intra-warehouse logistics scenario. During seven years of competition a lot of knowledge and experience regarding autonomous robots was gained. This knowledge and experience shall provide the basis for further research in challenges of future production. The focus of our SMART-FACTORY is to create a stimulating environment for research on logistics robotics, for teaching activities in computer science and electrical engineering programmes as well as for industrial users to study and explore the feasibility of future technologies. Building on a very successful history in the RoboCup Logistics League we aim to provide stakeholders with a dedicated facility oriented at their individual needs.
Y1  - 2020
U6  - http://dx.doi.org/10.1109/ICPS48405.2020.9274766
N1  - 2020 IEEE Conference on Industrial Cyberphysical Systems (ICPS), 10-12 June 2020, Tampere, Finland.
SP  - 297
EP  - 302
PB  - IEEE
ER  - 
TY  - CHAP
A1  - Cordes, Sven
A1  - Gligorevic, Snjezana
A1  - Blicharski, Peter
T1  - Analysis of sine precision influence on DOA estimation using the MUSIC algorithm
T2  - 2019 20th International Radar Symposium (IRS)
Y1  - 2019
SN  - 978-3-7369-9860-5
U6  - http://dx.doi.org/10.23919/IRS.2019.8768162
SP  - 1
EP  - 10
ER  - 
TY  - CHAP
A1  - Donner, Ralf
A1  - Rabel, Matthias
A1  - Scholl, Ingrid
A1  - Ferrein, Alexander
A1  - Donner, Marc
A1  - Geier, Andreas
A1  - John, André
A1  - Köhler, Christian
A1  - Varga, Sebastian
T1  - Die Extraktion bergbaulich relevanter Merkmale aus 3D-Punktwolken eines untertagetauglichen mobilen Multisensorsystems
T2  - Tagungsband Geomonitoring
Y1  - 2019
U6  - http://dx.doi.org/10.15488/4515
SP  - 91
EP  - 110
ER  - 
TY  - CHAP
A1  - Steinbauer, Gerald
A1  - Ferrein, Alexander
T1  - 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.
T2  - CEUR workshop proceedings
Y1  - 2019
SN  - 1613-0073
N1  - edited by Gerald Steinbauer, Alexander Ferrein
IS  - Vol-2325
ER  - 
TY  - CHAP
A1  - Schiffer, Fabian
A1  - Bragard, Michael
T1  - Cascaded LQ and Field-Oriented Control of a Mobile Inverse Pendulum (Segway) with Permanent Magnet Synchronous Machines
T2  - 2019 20th International Conference on Research and Education in Mechatronics (REM)
Y1  - 2019
SN  - 978-1-5386-9257-8
U6  - http://dx.doi.org/10.1109/REM.2019.8744101
SP  - 1
EP  - 8
ER  - 
TY  - CHAP
A1  - Bragard, Michael
A1  - Sube, Maike
A1  - Schneider, Maike
A1  - Jungemann, Christoph
T1  - Introducing a Cross-University Bachelor’s Programme with Orientation Semester - Enabling a Permeable Academic Education System
T2  - 2019 20th International Conference on Research and Education in Mechatronics (REM)
Y1  - 2019
SN  - 978-1-5386-9257-8
U6  - http://dx.doi.org/10.1109/REM.2019.8744132
SP  - 1
EP  - 6
ER  - 
TY  - CHAP
A1  - Weber, Niklas
A1  - Wolf, Martin
ED  - Barton, Thomas
T1  - Datenerhebung für die CDG-Forschung
T2  - Prozesse, Technologie, Anwendungen, Systeme und Management 2017 : angewandte Forschung in der Wirtschaftsinformatik : Tagungsband zur 30. AKWI-Jahrestagung vom 17.09.2017 bis 20.09.2017 an der Hochschule Aschaffenburg / Arbeitskreis Wirtschaftsinformatik an Fachhochschulen (AKWI)
Y1  - 2017
SN  - 978-3-944330-56-3
SP  - 218
EP  - 227
PB  - mana-Buch
CY  - Heide
ER  - 
TY  - CHAP
A1  - Chajan, Eduard
A1  - Schulte-Tigges, Joschua
A1  - Reke, Michael
A1  - Ferrein, Alexander
A1  - Matheis, Dominik
A1  - Walter, Thomas
T1  - GPU based model-predictive path control for self-driving vehicles
T2  - IEEE Intelligent Vehicles Symposium (IV)
N2  - One central challenge for self-driving cars is a proper path-planning. Once a trajectory has been found, the next challenge is to accurately and safely follow the precalculated path. The model-predictive controller (MPC) is a common approach for the lateral control of autonomous vehicles. The MPC uses a vehicle dynamics model to predict the future states of the vehicle for a given prediction horizon. However, in order to achieve real-time path control, the computational load is usually large, which leads to short prediction horizons. To deal with the computational load, the control algorithm can be parallelized on the graphics processing unit (GPU). In contrast to the widely used stochastic methods, in this paper we propose a deterministic approach based on grid search. Our approach focuses on systematically discovering the search area with different levels of granularity. To achieve this, we split the optimization algorithm into multiple iterations. The best sequence of each iteration is then used as an initial solution to the next iteration. The granularity increases, resulting in smooth and predictable steering angle sequences. We present a novel GPU-based algorithm and show its accuracy and realtime abilities with a number of real-world experiments.
KW  - Heuristic algorithms
KW  - Computational modeling
KW  - model-predictive control
KW  - GPU
KW  - autonomous driving
Y1  - 2021
SN  - 978-1-7281-5394-0
U6  - http://dx.doi.org/10.1109/IV48863.2021.9575619
N1  - 2021 IEEE Intelligent Vehicles Symposium (IV)
July 11-17, 2021. Nagoya, Japan
SP  - 1243
EP  - 1248
PB  - IEEE
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  - 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  - 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  - 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  - Hüning, Felix
T1  - Sustainable changes beyond covid-19 for a second semester physics course for electrical engineering students
T2  - Blended Learning in Engineering Education: challenging, enlightening – and lasting?
N2  - The course Physics for Electrical Engineering is part of the curriculum of the
bachelor program Electrical Engineering at University of Applied Science Aachen.
Before covid-19 the course was conducted in a rather traditional way with all parts
(lecture, exercise and lab) face-to-face. This teaching approach changed
fundamentally within a week when the covid-19 limitations forced all courses to
distance learning. All parts of the course were transformed to pure distance learning
including synchronous and asynchronous parts for the lecture, live online-sessions
for the exercises and self-paced labs at home. Using these methods, the course was
able to impart the required knowledge and competencies. Taking the teacher’s
observations of the student’s learning behaviour and engagement, the formal and
informal feedback of the students and the results of the exams into account, the new
methods are evaluated with respect to effectiveness, sustainability and suitability for
competence transfer. Based on this analysis strong and weak points of the concept
and countermeasures to solve the weak points were identified. The analysis further
leads to a sustainable teaching approach combining synchronous and asynchronous
parts with self-paced learning times that can be used in a very flexible manner for
different learning scenarios, pure online, hybrid (mixture of online and presence
times) and pure presence teaching.
Y1  - 2021
SN  - 978-2-87352-023-6
N1  - SEFI 49th Annual Conference
Technische Universität Berlin (online),
13 – 16 September 2021
SP  - 1405
EP  - 1409
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  - 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  - 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  - 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  - 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
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  - Altherr, Lena
A1  - Pelz, Peter F.
A1  - Ederer, Thorsten
A1  - Pfetsch, Marc E.
ED  - Jacobs, Georg
T1  - Optimale Getriebe auf Knopfdruck: Gemischt-ganzzahlige nichtlineare Optimierung zur Entscheidungsunterstützung bei der Auslegung von Getrieben für Kraftfahrzeuge
T2  - Antriebstechnisches Kolloquium ATK 2017
Y1  - 2017
SN  - 9783743148970
N1  - Antriebstechnisches Kolloquium ATK 2017,
07.03-08.03.2017.
Aachen, Deutschland
SP  - 313
EP  - 325
ER  - 
TY  - CHAP
A1  - Rausch, Lea
A1  - Friesen, John
A1  - Altherr, Lena
A1  - Pelz, Peter F.
ED  - Kliewer, Natalia
ED  - Ehmke, Jan Fabian
ED  - Borndörfer, Ralf
T1  - Using mixed-integer programming for the optimal design of water supply networks for slums
T2  - Operations Research Proceedings 2017
N2  - The UN sets the goal to ensure access to water and sanitation for all people by 2030. To address this goal, we present a multidisciplinary approach for designing water supply networks for slums in large cities by applying mathematical optimization. The problem is modeled as a mixed-integer linear problem (MILP) aiming to find a network describing the optimal supply infrastructure. To illustrate the approach, we apply it on a small slum cluster in Dhaka, Bangladesh.
Y1  - 2018
SN  - 978-3-319-89919-0 (Print)
SN  - 978-3-319-89920-6 (Online)
U6  - http://dx.doi.org/10.1007/978-3-319-89920-6_68
N1  - International Conference of the German Operations Research Society (GOR), Freie Universiät Berlin, Germany, September 6-8, 2017.
SP  - 509
EP  - 516
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Rausch, Lea
A1  - Leise, Philipp
A1  - Ederer, Thorsten
A1  - Altherr, Lena
A1  - Pelz, Peter F.
ED  - Papadrakakis, M.
ED  - Ppadopoulos, V.
ED  - Stefanou, G.
ED  - Plevris, V.
T1  - A comparison of MILP and MINLP solver performance on the example of a drinking water supply system design problem
T2  - ECCOMAS Congress 2016 VII European Congress on Computational Methods in Applied Sciences and Engineering
N2  - Finding a good system topology with more than a handful of components is a
highly non-trivial task. The system needs to be able to fulfil all expected load cases, but at the
same time the components should interact in an energy-efficient way. An example for a system
design problem is the layout of the drinking water supply of a residential building. It may be
reasonable to choose a design of spatially distributed pumps which are connected by pipes in at
least two dimensions. This leads to a large variety of possible system topologies. To solve such
problems in a reasonable time frame, the nonlinear technical characteristics must be modelled
as simple as possible, while still achieving a sufficiently good representation of reality. The
aim of this paper is to compare the speed and reliability of a selection of leading mathematical
programming solvers on a set of varying model formulations. This gives us empirical evidence
on what combinations of model formulations and solver packages are the means of choice with the current state of the art.
KW  - Technical Operations Research
KW  - Mixed-Integer Nonlinear Optimisation
KW  - Solver Per- formance
KW  - Drinking Water Supply
KW  - System Design Problem
Y1  - 2016
SN  - 978-618-82844-0-1
N1  - ECCOMAS Congress 2016
VII European Congress on Computational Methods in Applied Sciences and Engineering, 5–10 June 2016.Crete Island, Greece
SP  - 8509
EP  - 8527
ER  - 
TY  - CHAP
A1  - Hüning, Felix
A1  - Wache, Franz-Josef
A1  - Magiera, David
T1  - Redundant bus systems using dual-mode radio
T2  - Proceedings of Sixth International Congress on Information and Communication Technology
N2  - Communication via serial bus systems, like CAN, plays an important role for all kinds of embedded electronic and mechatronic systems. To cope up with the requirements for functional safety of safety-critical applications, there is a need to enhance the safety features of the communication systems. One measure to achieve a more robust communication is to add redundant data transmission path to the applications. In general, the communication of real-time embedded systems like automotive applications is tethered, and the redundant data transmission lines are also tethered, increasing the size of the wiring harness and the weight of the system. A radio link is preferred as a redundant transmission line as it uses a complementary transmission medium compared to the wired solution and in addition reduces wiring harness size and weight. Standard wireless links like Wi-Fi or Bluetooth cannot meet the requirements for real-time capability with regard to bus communication. Using the new dual-mode radio enables a redundant transmission line meeting all requirements with regard to real-time capability, robustness and transparency for the data bus. In addition, it provides a complementary transmission medium with regard to commonly used tethered links. A CAN bus system is used to demonstrate the redundant data transfer via tethered and wireless CAN.
Y1  - 2021
SN  - 978-981-16-2379-0
SN  - 978-981-16-2380-6
U6  - http://dx.doi.org/10.1007/978-981-16-2380-6_73
N1  - Proceedings of Sixth International Congress on Information and Communication Technology, ICICT 2021, Brunel University, London, February 25–26, 2021
SP  - 835
EP  - 842
PB  - Springer
CY  - Singapore
ER  - 
TY  - CHAP
A1  - Nees, Franz
A1  - Stengel, Ingo
A1  - Meister, Vera G.
A1  - Barton, Thomas
A1  - Herrmann, Frank
A1  - Müller, Christian
A1  - Wolf, Martin
T1  - Angewandte Forschung in der Wirtschaftsinformatik 2020 : Tagungsband zur 33. AKWI-Jahrestagung am 14.09.2020, ausgerichtet von der Hochschule Karlsruhe - Wirtschaft und Technik / hrsg. von Franz Nees, Ingo Stengel, Vera G. Meister, Thomas Barton, Frank Herrmann, Christian Müller, Martin R. Wolf
N2  - Tagungsbeiträge aus den Bereichen KI, Prozessorganisation und Plattformen für Geschäftsprozesse, Sicherheit und Datenschutz sowie Prototypen und Modelle.
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-13840
SN  - 978-3-944330-66-2
PB  - mana-Buch
CY  - Heide
ER  - 
TY  - CHAP
A1  - Wolf, Martin
A1  - Barton, Thomas
A1  - Herrmann, Frank
A1  - Meister, Vera G.
A1  - Müller, Christian
A1  - Seel, Christian
T1  - Angewandte Forschung in der Wirtschaftsinformatik 2019 : Tagungsband zur 32. AKWI-Jahrestagung vom 15.09.2019 bis 18.09.2019 an der Fachhochschule für Angewandte Wissenschaften Aachen / hrsg. von Martin R. Wolf, Thomas Barton, Frank Herrmann, Vera G. Meister, Christian Müller, Christian Seel
N2  - Tagungsbeiträge aus den Bereichen Projektmanagement, Didaktik in der Wirtschaftsinformatik, IT-Sicherheit, Anwendungsfälle, Reifegradmodelle, Plattformen für Geschäftsprozesse und Prototypen.
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:526-opus4-13026
SN  - 978-3-944330-62-4
PB  - mana-Buch
CY  - Heide
ER  -