TY  - CHAP
A1  - Christian, Esser
A1  - Montag, Tim
A1  - Schuba, Marko
A1  - Allhof, Manuel
T1  - Future critical infrastructure and security - cyberattacks on charging stations
T2  - 31st International Electric Vehicle Symposium & Exhibition and International Electric Vehicle Technology Conference (EVS31 & EVTeC 2018)
Y1  - 2018
SN  - 978-1-5108-9157-9
SP  - 665
EP  - 671
PB  - Society of Automotive Engineers of Japan (JSAE)
CY  - Tokyo
ER  - 
TY  - CHAP
A1  - Hebel, Christoph
A1  - Herrmann, Ulf
A1  - Ritz, Thomas
A1  - Röth, Thilo
A1  - Anthrakidis, Anette
A1  - Böker, Jörg
A1  - Franzke, Till
A1  - Grodzki, Thomas
A1  - Merkens, Torsten
A1  - Schöttler, Mirjam
T1  - FlexSHARE – Methodisches Framework zur innovativen Gestaltung der urbanen Mobilität durch Sharing- Angebote
T2  - Transforming Mobility – What Next?
N2  - Das Ziel des INTERREG-Projektes „SHAREuregio“ (FKZ: 34.EFRE-0300134)
ist es, grenzüberschreitende Mobilität in der Euregio Rhein-Maas-Nord zu
ermöglichen und zu fördern. Dazu soll ein elektromobiles Car- und Bikesharing-
System entwickelt und in der Stadt Mönchengladbach, im Kreis Viersen
sowie in den Gemeinden Roermond und Venlo (beide NL) zusammen mit den
Partnern Wirtschaftsförderung Mönchengladbach, Wirtschaftsförderung für den
Kreis Viersen, NEW AG, Goodmoovs (NL), Greenflux (NL) und der FH Aachen
implementiert werden. Zunächst richtet sich das Angebot, bestehend aus 40
Elektroautos und 40 Elektrofahrrädern, an Unternehmen und wird nach einer
Erprobungsphase, mit einer größeren Anzahl an Fahrzeugen, auch für Privatpersonen
verfügbar gemacht werden. Die Fahrzeuge stehen bei den jeweiligen
Anwendungspartnern in Deutschland und den Niederlanden.
Im Rahmen dieses Projektes hat die FH Aachen „FlexSHARE“ entwickelt
– ein methodisches Framework zur innovativen Gestaltung urbaner Sharing-
Angebote. Das Framework ermöglicht es, anhand von messbaren Kenngrößen,
bedarfsgerechte und auf die Region abgestimmte Sharing-Systeme zu entwickeln.
Y1  - 2022
SN  - 978-3-658-36429-8
U6  - http://dx.doi.org/10.1007/978-3-658-36430-4_10
N1  - Tagungsband zum 13. Wissenschaftsforum Mobilität,  Beiträge des Wissenschaftsforums
SP  - 153
EP  - 169
PB  - Springer Gabler
CY  - Wiesbaden
ER  - 
TY  - CHAP
A1  - Allal, D.
A1  - Bannister, R.
A1  - Buisman, K.
A1  - Capriglione, D.
A1  - Di Capua, G.
A1  - García-Patrón, M.
A1  - Gatzweiler, Thomas
A1  - Gellersen, F.
A1  - Harzheim, Thomas
A1  - Heuermann, Holger
A1  - Hoffmann, J.
A1  - Izbrodin, A.
A1  - Kuhlmann, K.
A1  - Lahbacha, K.
A1  - Maffucci, A.
A1  - Miele, G.
A1  - Mubarak, F.
A1  - Salter, M.
A1  - Pham, T.D.
A1  - Sayegh, A.
A1  - Singh, D.
A1  - Stein, F.
A1  - Zeier, M.
T1  - RF measurements for future communication applications: an overview
T2  - 2022 IEEE International Symposium on Measurements & Networking (M&N)
N2  - In this paper research activities developed within the FutureCom project are presented. The project, funded by the European Metrology Programme for Innovation and Research (EMPIR), aims at evaluating and characterizing: (i) active devices, (ii) signal- and power integrity of field programmable gate array (FPGA) circuits, (iii) operational performance of electronic circuits in real-world and harsh environments (e.g. below and above ambient temperatures and at different levels of humidity), (iv) passive inter-modulation (PIM) in communication systems considering different values of temperature and humidity corresponding to the typical operating conditions that we can experience in real-world scenarios. An overview of the FutureCom project is provided here, then the research activities are described.
KW  - FPGA
KW  - signal integrity
KW  - power integrity
KW  - passive inter-modulation
KW  - metrological characterization
Y1  - 2022
SN  - 978-1-6654-8362-9
SN  - 978-1-6654-8363-6
U6  - http://dx.doi.org/10.1109/MN55117.2022.9887740
SN  - 2639-5061
SN  - 2639-507X
N1  - 2022 IEEE International Symposium on Measurements & Networking (M&N), 18-20 July 2022, Padua, Italy.
SP  - 1
EP  - 6
PB  - IEEE
ER  - 
TY  - CHAP
A1  - Zähl, Philipp M.
A1  - Biewendt, Marcel
A1  - Wolf, Martin
A1  - Eggert, Mathias
T1  - Requirements for Competence Developing Games in the Environment of SE Competence Development
T2  - Angewandte Forschung in der Wirtschaftsinformatik 2022
N2  - Many of today’s factors make software development more and more complex, such as time pressure, new technologies, IT security risks, et cetera. Thus, a good preparation of current as well as future software developers in terms of a good software engineering education becomes progressively important. As current research shows, Competence Developing Games (CDGs) and Serious Games can offer a potential solution.

This paper identifies the necessary requirements for CDGs to be conducive in principle, but especially in software engineering (SE) education. For this purpose, the current state of research was summarized in the context of a literature review. Afterwards, some of the identified requirements as well as some additional requirements were evaluated by a survey in terms of subjective relevance.
KW  - software engineering
KW  - requirements
KW  - competence developing games
KW  - systematic literature review
Y1  - 2022
SN  - 978-3-95545-409-8
U6  - http://dx.doi.org/10.30844/AKWI_2022_05
N1  - Tagungsband zur 35. Jahrestagung des Arbeitskreises Wirtschaftsinformatik an Hochschulen für Angewandte Wissenschaften im deutschsprachigen Raum (AKWI) vom 11.09. bis 13.09.2022, ausgerichtet von der Hochschule für Technik und Wirtschaft Berlin (HTW Berlin) und der Hochschule für Wirtschaft und Recht Berlin (HWR Berlin)
SP  - 73
EP  - 88
PB  - GITO
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Alt, Helmut
T1  - Speicher speichern, Leiter leiten
T2  - Generationenprojekt Energiewende : Elektroenergiepolitik im Spannungsfeld zwischen Vision und Mission / Herbert Niederhausen (Hrsg.)
Y1  - 2022
SN  - 9783755774389
N1  - gedruckt in der Bereichsbibliothek Eupener Str. unter der Signatur 21 ZPM 4
SP  - 125
EP  - 136
PB  - Books on Demand
CY  - Norderstedt
ER  - 
TY  - GEN
A1  - Wiegner, J.
A1  - Volker, H.
A1  - Mainz, F.
A1  - Backes, A.
A1  - Löken, M.
A1  - Hüning, Felix
T1  - Wiegand-Effect-Powered Wireless IT Sensor Node
N2  - With the growing interest in small distributed sensors for the “Internet of Things”, more attention is being paid to energy harvesting techologies. Reducing or eliminating the need for external power sources or batteries make devices more self-sufficient, more reliable, and reduces maintenance requirements. The Wiegand effect is a proven technology for harvesting small amounts of electrical power from mechanical motion.
Y1  - 2022
N1  - PSMA International Energy Harvesting Workshop ~ 5-7 April 2022, Raleigh, NC, USA
ER  - 
TY  - CHAP
A1  - Grund, Raphael M.
A1  - Altherr, Lena
ED  - Reiff-Stephan, Jörg
ED  - Jäkel, Jens
ED  - Schwarz, André
T1  - Development of an open source energy disaggregation tool for the home automation platform Home Assistant
T2  - Tagungsband AALE 2023 : mit Automatisierung gegen den Klimawandel
N2  - In order to reduce energy consumption of homes, it is important to make transparent which devices consume how much energy. However, power consumption is often only monitored aggregated at the house energy meter. Disaggregating this power consumption into the contributions of individual devices can be achieved using Machine Learning. Our work aims at making state of the art disaggregation algorithms accessibe for users of the open source home automation platform Home Assistant.
KW  - Home Automation Platform
KW  - Home Assistant
KW  - Open Source
KW  - Machine Learning
KW  - Energy Disaggregation
Y1  - 2023
SN  - 978-3-910103-01-6
U6  - http://dx.doi.org/10.33968/2023.02
N1  - 19. AALE-Konferenz. Luxemburg, 08.03.-10.03.2023.
BTS Connected Buildings & Cities Luxemburg
(Tagungsband unter https://doi.org/10.33968/2023.01)
SP  - 11
EP  - 20
PB  - le-tex publishing services GmbH
CY  - Leipzig
ER  - 
TY  - PAT
A1  - Bragard, Michael
A1  - Hüning, Felix
A1  - Kowalewski, Paul
T1  - Vorrichtung zur Relativlagenbestimmung [Offenlegungschrift]
N2  - Die Erfindung betrifft eine Vorrichtung zur Bestimmung einer Relativlage zwischen einem feststehenden Teil und einem zu demselben in eine Bewegungsrichtung bewegbaren beweglichen Teil, wobei der feststehende Teil mit einem Wiegandsensor versehen ist, wobei der Wiegandsensor zwischen zwei gegenpolig zueinander ausgebildeten Permanentmagneten angeordnet ist und dass der bewegliche Teil eine Mehrzahl von beabstandet zueinander angeordneten Magnetisierungsstegen aus einem magnetisch leitenden Material aufweist, die in der Bewegungsrichtung zumindest eine gleich große Erstreckung aufweisen wie der Permanentmagnet, dass ein Abstand zwischen benachbarten Magnetisierungsstegen derart gewählt ist, dass in einer ersten Relativlage ein erster Permanentmagnet von einem der Magnetisierungsstege überdeckt ist und ein zweiter Permanentmagnet nicht von einem der Magnetisierungsstege überdeckt ist.
Y1  - 2023
N1  - Offenlegungschrift zu DE102022115350A1 2023.12.21
ER  - 
TY  - CHAP
A1  - Wittig, M.
A1  - Rütters, René
A1  - Bragard, Michael
ED  - Reiff-Stephan, Jörg
ED  - Jäkel, Jens
ED  - Schwarz, André
T1  - Application of RL in control systems using the example of a rotatory inverted pendulum
T2  - Tagungsband AALE 2024 : Fit für die Zukunft: praktische Lösungen für die industrielle Automation
N2  - In this paper, the use of reinforcement learning (RL) in control systems is investigated using a rotatory inverted pendulum as an example. The control behavior of an RL controller is compared to that of traditional LQR and MPC controllers. This is done by evaluating their behavior under optimal conditions, their disturbance behavior, their robustness and their development process. All the investigated controllers are developed using MATLAB and the Simulink simulation environment and later deployed to a real pendulum model powered by a Raspberry Pi. The RL algorithm used is Proximal Policy Optimization (PPO). The LQR controller exhibits an easy development process, an average to good control behavior and average to good robustness. A linear MPC controller could show excellent results under optimal operating conditions. However, when subjected to disturbances or deviations from the equilibrium point, it showed poor performance and sometimes instable behavior. Employing a nonlinear MPC Controller in real time was not possible due to the high computational effort involved. The RL controller exhibits by far the most versatile and robust control behavior. When operated in the simulation environment, it achieved a high control accuracy. When employed in the real system, however, it only shows average accuracy and a significantly greater performance loss compared to the simulation than the traditional controllers. With MATLAB, it is not yet possible to directly post-train the RL controller on the Raspberry Pi, which is an obstacle to the practical application of RL in a prototyping or teaching setting. Nevertheless, RL in general proves to be a flexible and powerful control method, which is well suited for complex or nonlinear systems where traditional controllers struggle.
KW  - Rotatory Inverted Pendulum
KW  - MPC
KW  - LQR
KW  - PPO
KW  - Reinforcement Learning
Y1  - 2024
SN  - 978-3-910103-02-3
U6  - http://dx.doi.org/10.33968/2024.53
N1  - 20. AALE-Konferenz. Bielefeld, 06.03.-08.03.2024.
(Tagungsband unter https://doi.org/10.33968/2024.29)
SP  - 241
EP  - 248
PB  - le-tex publishing services GmbH
CY  - Leipzig
ER  - 
TY  - CHAP
A1  - Altherr, Lena
A1  - Döring, Bernd
A1  - Frauenrath, Tobias
A1  - Groß, Rolf
A1  - Mohan, Nijanthan
A1  - Oyen, Marc
A1  - Schnittcher, Lukas
A1  - Voß, Norbert
ED  - Reiff-Stephan, Jörg
ED  - Jäkel, Jens
ED  - Schwarz, André
T1  - DiggiTwin: ein interdisziplinäres Projekt zur Nutzung digitaler Zwillinge auf dem Weg zu einem klimaneutralen Gebäudebestand
T2  - Tagungsband AALE 2024 : Fit für die Zukunft: praktische Lösungen für die industrielle Automation
N2  - Im Hinblick auf die Klimaziele der Bundesrepublik Deutschland konzentriert sich das Projekt Diggi Twin auf die nachhaltige Gebäudeoptimierung. Grundlage für eine ganzheitliche Gebäudeüberwachung und -optimierung bildet dabei die Digitalisierung und Automation im Sinne eines Smart Buildings. Das interdisziplinäre Projekt der FH Aachen hat das Ziel, ein bestehendes Hochschulgebäude und einen Neubau an klimaneutrale Standards anzupassen. Im Rahmen des Projekts werden bekannte Verfahren, wie das Building Information Modeling (BIM), so erweitert, dass ein digitaler Gebäudezwilling entsteht. Dieser kann zur Optimierung des Gebäudebetriebs herangezogen werden, sowie als Basis für eine Erweiterung des Bewertungssystems Nachhaltiges Bauen (BNB) dienen. Mithilfe von Sensortechnologie und künstlicher Intelligenz kann so ein präzises Monitoring wichtiger Gebäudedaten erfolgen, um ungenutzte Energieeinsparpotenziale zu erkennen und zu nutzen. Das Projekt erforscht und setzt methodische Erkenntnisse zu BIM und digitalen Gebäudezwillingen praxisnah um, indem es spezifische Fragen zur Energie- und Ressourceneffizienz von Gebäuden untersucht und konkrete Lösungen für die Gebäudeoptimierung entwickelt.
KW  - Anomalieerkennung
KW  - IoT
KW  - Überwachung & Optimierung
KW  - DiggiTwin
KW  - BIM
KW  - Smart Building
KW  - Digitalisierung
Y1  - 2024
SN  - 978-3-910103-02-3
U6  - http://dx.doi.org/10.33968/2024.67
N1  - 20. AALE-Konferenz. Bielefeld, 06.03.-08.03.2024
(Tagungsband unter https://doi.org/10.33968/2024.29)
SP  - 341
EP  - 346
PB  - le-tex publishing services GmbH
CY  - Leipzig
ER  - 
TY  - JOUR
A1  - Fagan, Andrew J.
A1  - Bitz, Andreas
A1  - Björkman-Burtscher, Isabella M.
A1  - Collins, Christopher M.
A1  - Kimbrell, Vera
A1  - Raaijmakers, Alexander J. E.
T1  - 7T MR Safety
JF  - Journal of Magnetic Resonance Imaging (JMRI)
Y1  - 2021
U6  - http://dx.doi.org/10.1002/jmri.27319
SN  - 1522-2586
VL  - 53
IS  - 2
SP  - 333
EP  - 346
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Fiedler, Thomas M.
A1  - Ladd, Mark E.
A1  - Clemens, Markus
A1  - Bitz, Andreas
T1  - Safety of subjects during radiofrequency exposure in ultra-high-field magnetic resonance imaging
JF  - IEEE Letters on Electromagnetic Compatibility Practice and Applications
N2  - Magnetic resonance imaging (MRI) is one of the most important medical imaging techniques. Since the introduction of MRI in the mid-1980s, there has been a continuous trend toward higher static magnetic fields to obtain i.a. a higher signal-to-noise ratio. The step toward ultra-high-field (UHF) MRI at 7 Tesla and higher, however, creates several challenges regarding the homogeneity of the spin excitation RF transmit field and the RF exposure of the subject. In UHF MRI systems, the wavelength of the RF field is in the range of the diameter of the human body, which can result in inhomogeneous spin excitation and local SAR hotspots. To optimize the homogeneity in a region of interest, UHF MRI systems use parallel transmit systems with multiple transmit antennas and time-dependent modulation of the RF signal in the individual transmit channels. Furthermore, SAR increases with increasing field strength, while the SAR limits remain unchanged. Two different approaches to generate the RF transmit field in UHF systems using antenna arrays close and remote to the body are investigated in this letter. Achievable imaging performance is evaluated compared to typical clinical RF transmit systems at lower field strength. The evaluation has been performed under consideration of RF exposure based on local SAR and tissue temperature. Furthermore, results for thermal dose as an alternative RF exposure metric are presented.
Y1  - 2020
SN  - 2637-6423
U6  - http://dx.doi.org/10.1109/LEMCPA.2020.3029747
VL  - 2
IS  - 3
SP  - 1
EP  - 8
PB  - IEEE
CY  - New York, NY
ER  - 
TY  - CHAP
A1  - Hofmann, Till
A1  - Limpert, Nicolas
A1  - Mataré, Viktor
A1  - Ferrein, Alexander
A1  - Lakemeyer, Gerhard
T1  - Winning the RoboCup Logistics League with Fast Navigation, Precise Manipulation, and Robust Goal Reasoning
T2  - RoboCup 2019: Robot World Cup XXIII. RoboCup
Y1  - 2019
SN  - 978-3-030-35699-6
U6  - http://dx.doi.org/10.1007/978-3-030-35699-6_41
N1  - Lecture Notes in Computer Science, vol 11531
SP  - 504
EP  - 516
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Hoegen, Anne von
A1  - Doncker, Rik W. De
A1  - Rütters, René
T1  - Teaching Digital Control of Operational Amplifier Processes with a LabVIEW Interface and Embedded Hardware
T2  - The 23rd International Conference on Electrical Machines and Systems (ICEMS), Hamamatsu, Japan
Y1  - 2020
U6  - http://dx.doi.org/10.23919/ICEMS50442.2020.9290928
SP  - 1117
EP  - 1122
ER  - 
TY  - CHAP
A1  - Ibanez-Sanchez, Gema
A1  - Wolf, Martin
T1  - Interactive Process Mining-Induced Change Management Methodology for Healthcare
T2  - Interactive Process Mining in Healthcare
N2  - The adoption of the Digital Health Transformation is a tremendous paradigm change in health organizations, which is not a trivial process in reality. For that reason, in this chapter, it is proposed a methodology with the objective to generate a changing culture in healthcare organisations. Such a change culture is essential for the successful implementation of any supporting methods like Interactive Process Mining. It needs to incorporate (mostly) new ways of team-based and evidence-based approaches for solving structural problems in a digital healthcare environment.
KW  - Methodology
KW  - Change culture
KW  - Lean thinking
KW  - Interactive process mining
KW  - Objective data
Y1  - 2020
SN  - 978-3-030-53993-1 (Online)
SN  - 978-3-030-53992-4 (Print)
U6  - http://dx.doi.org/10.1007/978-3-030-53993-1_16
SP  - 267
EP  - 293
PB  - Springer
CY  - Cham
ER  - 
TY  - JOUR
A1  - Hüning, Felix
A1  - Backes, Andreas
T1  - Direct observation of large Barkhausen jump in thin Vicalloy wires
JF  - IEEE Magnetics Letters
Y1  - 2020
SN  - 1949-307X
U6  - http://dx.doi.org/10.1109/LMAG.2020.3046411
VL  - 11
IS  - Art. 2506504
SP  - 1
EP  - 4
PB  - IEEE
CY  - New York, NY
ER  - 
TY  - CHAP
A1  - Hoegen, Anne von
A1  - Doncker, Rik W. De
A1  - Bragard, Michael
A1  - Hoegen, Svenja von
T1  - Problem-Based Learning in Automation Engineering: Performing a Remote Laboratory Session Serving Various Educational Attainments
T2  - 2021 IEEE Global Engineering Education Conference (EDUCON)
Y1  - 2021
U6  - http://dx.doi.org/10.1109/EDUCON46332.2021.9453925
SP  - 1605
EP  - 1614
ER  - 
TY  - CHAP
A1  - Hüning, Felix
A1  - Stüttgen, Marcel
T1  - Work in Progress: Interdisciplinary projects in times of COVID-19 crisis – challenges, risks and chances
T2  - 2021 IEEE Global Engineering Education Conference (EDUCON)
Y1  - 2021
U6  - http://dx.doi.org/10.1109/EDUCON46332.2021.9454006
SP  - 1175
EP  - 1179
ER  - 
TY  - JOUR
A1  - Altherr, Lena
A1  - Ederer, Thorsten
A1  - Lorenz, Ulf
A1  - Pelz, Peter F.
A1  - Pöttgen, Philipp
ED  - Lübbecke, Marco
ED  - Koster, Arie
ED  - Letmathe, Peter
ED  - Madlener, Reihard
ED  - Peis, Britta
ED  - Walther, Grit
T1  - Experimental validation of an enhanced system synthesis approach
JF  - Operations Research Proceedings 2014
N2  - Planning the layout and operation of a technical system is a common task
for an engineer. Typically, the workflow is divided into consecutive stages: First,
the engineer designs the layout of the system, with the help of his experience or of
heuristic methods. Secondly, he finds a control strategy which is often optimized
by simulation. This usually results in a good operating of an unquestioned sys-
tem topology. In contrast, we apply Operations Research (OR) methods to find a
cost-optimal solution for both stages simultaneously via mixed integer program-
ming (MILP). Technical Operations Research (TOR) allows one to find a provable
global optimal solution within the model formulation. However, the modeling error
due to the abstraction of physical reality remains unknown. We address this ubiq-
uitous problem of OR methods by comparing our computational results with mea-
surements in a test rig. For a practical test case we compute a topology and control
strategy via MILP and verify that the objectives are met up to a deviation of 8.7%.
Y1  - 2014
SN  - 978-3-319-28695-2
U6  - http://dx.doi.org/10.1007/978-3-319-28697-6_1
PB  - Springer
CY  - Basel
ER  - 
TY  - JOUR
A1  - Vergé, Angela
A1  - Pöttgen, Philipp
A1  - Altherr, Lena
A1  - Ederer, Thorsten
A1  - Pelz, Peter F.
ED  - Greuloch, Ivo
ED  - Weber, Manfred
ED  - Meier, Miles
T1  - Lebensdauer als Optimierungsziel:  Algorithmische Struktursynthese am Beispiel eines hydrostatischen Getriebes
JF  - O+P – Ölhydraulik und Pneumatik
N2  - Verfügbarkeit und Nachhaltigkeit sind wichtige Anforderungen bei der Planung langlebiger technischer Systeme. Meist werden bei Lebensdaueroptimierungen lediglich einzelne Komponenten vordefinierter Systeme untersucht. Ob eine optimale Lebensdauer eine gänzlich andere Systemvariante bedingt, wird nur selten hinterfragt. Technical Operations Research (TOR) erlaubt es, aus Obermengen technischer Systeme automatisiert die lebensdaueroptimale Systemstruktur auszuwählen. Der Artikel zeigt dies am Beispiel eines hydrostatischen Getriebes.
Y1  - 2016
SN  - 1614-9602
VL  - 60
IS  - 1-2
SP  - 114
EP  - 121
PB  - Vereinigte Fachverl.
CY  - Mainz
ER  - 
TY  - CHAP
A1  - Altherr, Lena
A1  - Ederer, Thorsten
A1  - Schänzle, Christian
A1  - Lorenz, Ulf
A1  - Pelz, Peter F.
T1  - Algorithmic system design using scaling and affinity laws
T2  - Operations Research Proceedings 2015
N2  - Energy-efficient components do not automatically lead to energy-efficient systems. Technical Operations Research (TOR) shifts the focus from the single component to the system as a whole and finds its optimal topology and operating strategy simultaneously. In previous works, we provided a preselected construction kit of suitable components for the algorithm. This approach may give rise to a combinatorial explosion if the preselection cannot be cut down to a reasonable number by human intuition. To reduce the number of discrete decisions, we integrate laws derived from similarity theory into the optimization model. Since the physical characteristics of a production series are similar, it can be described by affinity and scaling laws. Making use of these laws, our construction kit can be modeled more efficiently: Instead of a preselection of components, it now encompasses whole model ranges. This allows us to significantly increase the number of possible set-ups in our model. In this paper, we present how to embed this new formulation into a mixed-integer program and assess the run time via benchmarks. We present our approach on the example of a ventilation system design problem.
KW  - Optimal Topology
KW  - Piecewise Linearization
KW  - Ventilation System
KW  - Similarity Theory
Y1  - 2017
SN  - 978-3-319-42901-4
SN  - 978-3-319-42902-1
U6  - http://dx.doi.org/10.1007/978-3-319-42902-1
N1  - International Conference of the German, Austrian and Swiss Operations Research Societies (GOR, ÖGOR, SVOR/ASRO), University of Vienna, Austria, September 1-4, 2015
SP  - 605
EP  - 611
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Nikolovski, Gjorgji
A1  - Reke, Michael
A1  - Elsen, Ingo
A1  - Schiffer, Stefan
T1  - Machine learning based 3D object detection for navigation in unstructured environments
T2  - 2021 IEEE Intelligent Vehicles Symposium Workshops (IV Workshops)
N2  - In this paper we investigate the use of deep neural networks for 3D object detection in uncommon, unstructured environments such as in an open-pit mine. While neural nets are frequently used for object detection in regular autonomous driving applications, more unusual driving scenarios aside street traffic pose additional challenges. For one, the collection of appropriate data sets to train the networks is an issue. For another, testing the performance of trained networks often requires tailored integration with the particular domain as well. While there exist different solutions for these problems in regular autonomous driving, there are only very few approaches that work for special domains just as well. We address both the challenges above in this work. First, we discuss two possible ways of acquiring data for training and evaluation. That is, we evaluate a semi-automated annotation of recorded LIDAR data and we examine synthetic data generation. Using these datasets we train and test different deep neural network for the task of object detection. Second, we propose a possible integration of a ROS2 detector module for an autonomous driving platform. Finally, we present the performance of three state-of-the-art deep neural networks in the domain of 3D object detection on a synthetic dataset and a smaller one containing a characteristic object from an open-pit mine.
KW  - 3D object detection
KW  - LiDAR
KW  - autonomous driving
KW  - Deep learning
KW  - Three-dimensional displays
Y1  - 2021
SN  - 978-1-6654-7921-9
U6  - http://dx.doi.org/10.1109/IVWorkshops54471.2021.9669218
N1  - 2021 IEEE Intelligent Vehicles Symposium Workshops (IV Workshops), 11-17 July 2021,  Nagoya, Japan.
SP  - 236
EP  - 242
PB  - IEEE
ER  - 
TY  - CHAP
A1  - Altherr, Lena
A1  - Ederer, Thorsten
A1  - Vergé, Angela
A1  - Pelz, Peter F.
T1  - Algorithmische Struktursynthese eines hydrostatischen Getriebes
T2  - Antriebssysteme 2015 : Elektrik, Mechanik, Fluidtechnik in der Anwendung
Y1  - 2015
SN  - 978-3-18-092268-3
N1  - Antriebssysteme 2015 - Elektrik, Mechanik, Fluidtechnik in der Anwendung. VDI/VDE-Fachtagung. 11.11.15-12.11.15, Aachen.

Veröffentlicht in der Reihe VDI-Berichte, Bandnummer 2268.
SP  - 145
EP  - 155
PB  - VDI-Verlag
CY  - Düsseldorf
ER  - 
TY  - CHAP
A1  - Schänzle, Christian
A1  - Altherr, Lena
A1  - Ederer, Thorsten
A1  - Lorenz, Ulf
A1  - Pelz, Peter F.
T1  - As good as it can be: Ventilation system design by a combined scaling and discrete optimization method
T2  - Proceedings of FAN 2015
N2  - The understanding that optimized components do not automatically lead to energy-efficient systems sets the attention from the single component on the entire technical system. At TU Darmstadt, a new field of research named Technical Operations Research (TOR) has its origin. It combines mathematical and technical know-how for the optimal design of technical systems. We illustrate our optimization approach in a case study for the design of a ventilation system with the ambition to minimize the energy consumption for a temporal distribution of diverse load demands. By combining scaling laws with our optimization methods we find the optimal combination of fans and show the advantage of the use of multiple fans.
Y1  - 2015
N1  - Proceedings of FAN 2015, Lyon (France), 15 – 17 April 2015
SP  - 1
EP  - 11
ER  - 
TY  - JOUR
A1  - Pöttgen, Philipp
A1  - Ederer, Thorsten
A1  - Altherr, Lena
A1  - Lorenz, Ulf
A1  - Pelz, Peter F.
T1  - Examination and optimization of a heating circuit for energy-efficient buildings
JF  - Energy Technology
N2  - The conference center darmstadtium in Darmstadt is a prominent example of energy efficient buildings. Its heating system consists of different source and consumer circuits connected by a Zortström reservoir. Our goal was to reduce the energy costs of the system as much as possible. Therefore, we analyzed its supply circuits. The first step towards optimization is a complete examination of the system: 1) Compilation of an object list for the system, 2) collection of the characteristic curves of the components, and 3) measurement of the load profiles of the heat and volume-flow demand. Instead of modifying the system manually and testing the solution by simulation, the second step was the creation of a global optimization program. The objective was to minimize the total energy costs for one year. We compare two different topologies and show opportunities for significant savings.
KW  - energy transfer
KW  - heating system
KW  - programming
KW  - system optimization
KW  - technical operations research
Y1  - 2015
SN  - 2194-4296
U6  - http://dx.doi.org/10.1002/ente.201500252
VL  - 4
IS  - 1
SP  - 136
EP  - 144
PB  - WILEY-VCH Verlag
CY  - Weinheim
ER  - 
TY  - CHAP
A1  - Altherr, Lena
A1  - Ederer, Thorsten
A1  - Farnetane, Lucas S.
A1  - Pöttgen, Philipp
A1  - Vergé, Angela
A1  - Pelz, Peter F.
T1  - Multicriterial design of a hydrostatic transmission system via mixed-integer programming
T2  - Operations Research Proceedings 2015
N2  - In times of planned obsolescence the demand for sustainability keeps growing. Ideally, a technical system is highly reliable, without failures and down times due to fast wear of single components. At the same time, maintenance should preferably be limited to pre-defined time intervals. Dispersion of load between multiple components can increase a system’s reliability and thus its availability inbetween maintenance points. However, this also results in higher investment costs and additional efforts due to higher complexity. Given a specific load profile and resulting wear of components, it is often unclear which system structure is the optimal one. Technical Operations Research (TOR) finds an optimal structure balancing availability and effort. We present our approach by designing a hydrostatic transmission system.
Y1  - 2017
SN  - 978-3-319-42901-4
SN  - 978-3-319-42902-1
U6  - http://dx.doi.org/10.1007/978-3-319-42902-1_41
N1  - International Conference of the German, Austrian and Swiss Operations Research Societies (GOR, ÖGOR, SVOR/ASRO), University of Vienna, Austria, September 1-4, 2015
SP  - 301
EP  - 307
PB  - Springer
CY  - Cham
ER  - 
TY  - JOUR
A1  - Altherr, Lena
A1  - Ederer, Thorsten
A1  - Pöttgen, Philipp
A1  - Lorenz, Ulf
A1  - Pelz, Peter F.
ED  - Pelz, Peter F.
ED  - Groche, Peter
T1  - Multicriterial optimization of technical systems considering multiple load and availability scenarios
JF  - Applied Mechanics and Materials
N2  - Cheap does not imply cost-effective -- this is rule number one of zeitgeisty system design. The initial investment accounts only for a small portion of the lifecycle costs of a technical system. In fluid systems, about ninety percent of the total costs are caused by other factors like power consumption and maintenance. With modern optimization methods, it is already possible to plan an optimal technical system considering multiple objectives. In this paper, we focus on an often neglected contribution to the lifecycle costs: downtime costs due to spontaneous failures. Consequently, availability becomes an issue.
KW  - sustainability
KW  - availability
KW  - energy efficiency
KW  - mixed-integer linear programming
KW  - system synthesis
Y1  - 2015
SN  - 1660-9336
U6  - http://dx.doi.org/10.4028/www.scientific.net/AMM.807.247
VL  - 807
SP  - 247
EP  - 256
ER  - 
TY  - CHAP
A1  - Altherr, Lena
A1  - Leise, Philipp
T1  - Resilience as a concept for mastering uncertainty
T2  - Mastering Uncertainty in Mechanical Engineering
Y1  - 2021
SN  - 978-3-030-78353-2
U6  - http://dx.doi.org/10.1007/978-3-030-78354-9
N1  - Unterkapitel 6.3.1 des Kapitels "Strategies for Mastering Uncertainty"
SP  - 412
EP  - 417
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Altherr, Lena
A1  - Leise, Philipp
A1  - Pfetsch, Marc E.
A1  - Schmitt, Andreas
T1  - Optimal design of resilient technical systems on the example of water supply systems
T2  - Mastering Uncertainty in Mechanical Engineering
Y1  - 2021
SN  - 978-3-030-78356-3
N1  - Unterkapitel des Kapitels "Strategies for Mastering Uncertainty"
SP  - 429
EP  - 433
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  -