@inproceedings{UllmannKreimeierGoetzelmannetal.2020, author = {Ullmann, Daniela and Kreimeier, Julian and G{\"o}tzelmann, Timo and Kipke, Harald}, title = {BikeVR : a virtual reality bicycle simulator towards sustainable urban space and traffic planning}, series = {Proceedings of Mensch und Computer 2020}, booktitle = {Proceedings of Mensch und Computer 2020}, publisher = {Association for Computing Machinery}, address = {New York, NY}, isbn = {978-1-4503-7540-5}, doi = {10.1145/3404983.3410417}, pages = {511-514}, year = {2020}, abstract = {While becoming more and more aware of the ongoing climate change, eco-friendly means of transport for all citizens are moving further into focus. In order to be able to implement specific measures, it is necessary to better understand and emphasize sustainable transportation like walking and cycling through focused research. When developing novel traffic concepts and urban spaces for non-motorized traffic participants like bicycles and pedestrians, traffic and urban planning must be focused on their needs. To provide rare qualitative factors (such as stress, the perception of time and attractiveness of the environment) in this context, we present an audiovisual VR bicycle simulator which allows the user to cycle through a virtual urban environment by physically pedaling and also steering. Virtual Reality (VR) is a suitable tool in this context, as study participants find identical and almost freely definable (virtual) urban spaces with adjustable traffic scenarios. Our preliminary prototype proved to be promising and will be further optimized and evaluated.}, language = {en} } @inproceedings{Bergner2019, author = {Bergner, Kai}, title = {Potenzialanalyse eines Merra2-Sektors mit Schwerpunkt Laufwasserkraftwerke (Projektarbeit)}, address = {N{\"u}rnberg}, doi = {10.34646/thn/ohmdok-650}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:92-opus4-6502}, pages = {V, 21}, year = {2019}, abstract = {Basierend auf den erneuerbaren Energien Solarenergie, Windenergie, Biomasse und Laufwasser wird eine zuk{\"u}nftige Stromversorgung der Europ{\"a}ischen Metropolregion N{\"u}rnberg modelliert. Mit drei g{\"a}ngigen Speicherans{\"a}tzen wird eine m{\"o}glichst {\"o}konomische Prognose gestellt. Schwerpunkt der Betrachtung sind Laufwasserkraftwerke und deren Modernisierungs- und Ausbaupotenzial. Nach Analyse des Ist-Zustandes werden m{\"o}gliche technische Modernisierungen genannt und auf deren Stromentstehungskosten eingegangen. Das Ausbaupotenzial wird anhand einer Jahresdauerlinie erl{\"a}utert.}, subject = {Elektrizit{\"a}tsversorgung}, language = {de} } @inproceedings{Eisenberger2020, author = {Eisenberger, Julian}, title = {Projektarbeit Vollst{\"a}ndig regenerative Elektrizit{\"a}tsversorgung im S{\"u}den Mittelfrankens}, doi = {10.34646/thn/ohmdok-661}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:92-opus4-6614}, pages = {I -- 29}, year = {2020}, abstract = {Die NASA stellt mit ihrer Reanalyse-Datenbank MERRA-2 weltweit aufgezeichnete Klimadaten wie Sonneneinstrahlung, Windgeschwindigkeiten etc. zur Verf{\"u}gung. Die Daten sind jeweils einem Rastergebiet zugeordnet, welche durch ein weltumspannendes Raster mit einer Aufl{\"o}sung von ca. 0,5° x 0,625° Breitengrad x L{\"a}ngengrad ent-steht. Es liegen aktuell Messdaten aus den Jahren 1980 bis 2019 vor (NASA, 2017, S. 1-3). In dieser Ausarbeitung werden diese Rohdaten aufbereitet, analysiert und hinsichtlich ihrer Aussagekraft f{\"u}r eine zuk{\"u}nftige Nutzung der vorhandenen regenerativen Energieformen zur Umwandlung in Nutzenergie interpretiert. Es wird er{\"o}rtert, welche regenerativen Energietr{\"a}ger vor allem auch in Verbindung mit Speichertechnologien zur rein regenerativen Deckung des Energiebedarfs geeignet sind. Im Vergleich mit dem aktuellen Bestand an regenerativen Energieanlagen und unter der Annahme von gleichbleibender Einspeiseleistung aus Biomasse- und Laufwasseranlagen wird eine Empfehlung f{\"u}r einen optimalen Energiemix gegeben. Die Analyse bezieht sich auf ein Teilgebiet im S{\"u}den der Europ{\"a}ischen Metropolregion N{\"u}rnberg. Ein weiterer Bestandteil der Arbeit ist die Recherche zum aktuellen Technologiestand und den Kosten von geotechnischen Speichersystemen.}, subject = {Wetterdaten}, language = {de} } @inproceedings{Will2020, author = {Will, Katharina}, title = {Aufbereitung realer Verbrauchsdaten zur Modellierung einer regenerativen elektrischen Vollversorgung in der Metropolregion N{\"u}rnberg}, doi = {10.34646/thn/ohmdok-642}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:92-opus4-6424}, pages = {I -- 65}, year = {2020}, abstract = {In dieser Bachelorarbeit sollen die Stromverbr{\"a}uche der regionalen Teilgebiete der Europ{\"a}ischen Metropolregion N{\"u}rnberg ermittelt werden. Diese l{\"a}sst sich auf 17 Planquadrate gem{\"a}ß der NASA Datenbank MERRA-2 aufteilen. F{\"u}r jedes Gebiet soll eine Stromverbrauchszeitreihe aus den von den Verteilnetzbetreibern ver{\"o}ffentlichten tats{\"a}chlichen Verbr{\"a}uchen modelliert werden. Aufgrund der Unvollst{\"a}ndigkeit und Uneinheitlichkeit der ver{\"o}ffentlichten Daten erfordert dies eine aufwendige Aufbereitung der Daten und das Ermitteln realit{\"a}tsnaher Approximationen bei unvollst{\"a}ndigen Datens{\"a}tzen. Diese Arbeit soll die Grundlage f{\"u}r sp{\"a}ter durchzuf{\"u}hrende Versorgungsanalysen f{\"u}r die einzelnen Teilregionen bilden sowie f{\"u}r die Bestimmung der dazu n{\"o}tigen Speicherkapazit{\"a}ten.}, subject = {Elektrizit{\"a}tsverbrauch}, language = {de} } @inproceedings{BayerlFrassettoJauernigetal.2020, author = {Bayerl, Sebastian P. and Frassetto, Tommaso and Jauernig, Patrick and Riedhammer, Korbinian and Sadeghi, Ahmad-Reza and Schneider, Thomas and Stapf, Emmanuel and Weinert, Christian}, title = {Offline Model Guard: Secure and Private ML on Mobile Devices}, series = {2020 Design, Automation \& Test in Europe Conference \& Exhibition (DATE)}, booktitle = {2020 Design, Automation \& Test in Europe Conference \& Exhibition (DATE)}, publisher = {IEEE}, doi = {10.23919/DATE48585.2020.9116560}, pages = {6}, year = {2020}, abstract = {Performing machine learning tasks in mobile applications yields a challenging conflict of interest: highly sensitive client information (e.g., speech data) should remain private while also the intellectual property of service providers (e.g., model parameters) must be protected. Cryptographic techniques offer secure solutions for this, but have an unacceptable overhead and moreover require frequent network interaction.In this work, we design a practically efficient hardware-based solution. Specifically, we build OFFLINE MODEL GUARD (OMG) to enable privacy-preserving machine learning on the predominant mobile computing platform ARM—even in offline scenarios. By leveraging a trusted execution environment for strict hardware-enforced isolation from other system components, OMG guarantees privacy of client data, secrecy of provided models, and integrity of processing algorithms. Our prototype implementation on an ARM HiKey 960 development board performs privacy-preserving keyword recognition using TensorFlow Lite for Microcontrollers in real time.}, language = {en} } @inproceedings{KreimeierUllmannKipkeetal.2020, author = {Kreimeier, Julian and Ullmann, Daniela and Kipke, Harald and G{\"o}tzelmann, Timo}, title = {Initial Evaluation of Different Types of Virtual Reality Locomotion Towards a Pedestrian Simulator for Urban and Transportation Planning}, series = {Extended Abstracts of the 2020 CHI Conference on Human Factors in Computing Systems}, booktitle = {Extended Abstracts of the 2020 CHI Conference on Human Factors in Computing Systems}, publisher = {ACM}, address = {New York, NY, USA}, doi = {10.1145/3334480.3382958}, pages = {1 -- 6}, year = {2020}, abstract = {The simulation of human behaviour in today's travel demand models is usually based on the assumption of a rational behaviour of its participants. Since travel demand models have been applied in particular for motorized traffic, only little is known about the influence of variables that affect both the choice of trip destination and the route decision in pedestrian and cycling models. In order to create urban spaces that encourage cycling and walking, we propose a VR (Virtual Reality) pedestrian simulator which involves walk-in-place locomotion. Thus, identical conditions are obtained for all subjects which is not feasible in real world field research with naturally varying environmental influences. As a first step, our qualitative and quantitative user study revealed that walking in a VR treadmill felt safest and most intuitive, although walking in it took in return more energy than walking-in-place with VR trackers only.}, language = {en} } @inproceedings{KreimeierKargGoetzelmann2020, author = {Kreimeier, Julian and Karg, Pascal and G{\"o}tzelmann, Timo}, title = {Tabletop virtual haptics}, series = {Proceedings of the 13th ACM International Conference on PErvasive Technologies Related to Assistive Environments}, booktitle = {Proceedings of the 13th ACM International Conference on PErvasive Technologies Related to Assistive Environments}, publisher = {ACM}, address = {New York, NY, USA}, doi = {10.1145/3389189.3389194}, pages = {1 -- 10}, year = {2020}, abstract = {When thinking of Virtual Reality (VR), most people think of stunning audio-visual environments in the context of entertainment. However, VR can also provide haptic information, e.g., to convey spatial information to blind and visually impaired people. In this context of accessibility they might be able to explore independently and self-determined tactile graphics, e.g., the structure of unknown real places prior to visiting them. Thus, we propose and evaluate tabletop virtual objects that can be felt by nowadays commercially available VR components, instead of exploring physical models (e.g., 3D printed maps) with the bare hand. These can be easily placed on an empty table, giving the blind user faster and more independent access to tactile information than with real physical representations. Our comprehensive pilot user study shows that it is possible to recognize floor plans and simple geometric shapes in this context. Also, the insights gained with regard to the suitability for practical application in this context point out the way to eased access to spatial (virtual) information using off-the-shelf components which can significantly support blind and visually impaired users' autonomy.}, language = {en} } @inproceedings{KreimeierKargGoetzelmann2020, author = {Kreimeier, Julian and Karg, Pascal and G{\"o}tzelmann, Timo}, title = {BlindWalkVR}, series = {Proceedings of the 13th ACM International Conference on PErvasive Technologies Related to Assistive Environments}, booktitle = {Proceedings of the 13th ACM International Conference on PErvasive Technologies Related to Assistive Environments}, publisher = {ACM}, address = {New York, NY, USA}, doi = {10.1145/3389189.3389193}, pages = {1 -- 8}, year = {2020}, abstract = {Virtual Reality (VR) promises expanded access to spatial information, especially for blind and visually impaired people. Through haptic and acoustic feedback, real world's limitations like the risk of injury or the necessity of a sighted safety assistant can be circumvented. However, the best possible profit of this technology requires interactive locomotion in large virtual environments to overcome real world space limitations. Thus, we present formative insights of blind people's egocentric VR locomotion by comparing four different implementations (i.e., two VR treadmills, trackers on the ankles or joystick based locomotion) in a qualitative and quantitative user study with seven blind and visually impaired participants. Our results reveal novel insights on characteristics of each implementation in terms of usability and practicability and also provide recommendations for further work in this field with the target user group in sight.}, language = {en} } @inproceedings{KreimeierKappeGoetzelmann2020, author = {Kreimeier, Julian and Kappe, Maximilian and G{\"o}tzelmann, Timo}, title = {BlindScanLine}, series = {Proceedings of the 13th ACM International Conference on PErvasive Technologies Related to Assistive Environments}, booktitle = {Proceedings of the 13th ACM International Conference on PErvasive Technologies Related to Assistive Environments}, publisher = {ACM}, address = {New York, NY, USA}, doi = {10.1145/3389189.3393742}, pages = {1 -- 4}, year = {2020}, abstract = {Sonification is a promising way for blind and visually impaired people to capture and process information purely auditory, e.g., by mapping distance metrics on sound characteristics. To optimally use the users' sensory bandwidth and cognitive load a sequential scanning at multiple azimuth angles instead of only one measuring point straight ahead could be a suitable option. Thus, we present a preliminary cross-platform implementation and evaluation of such a sequential 'line-scanning sonification' using off-the-shelf components while comparing frequency (FM) and amplitude modulation (AM). In our user study with blindfolded and visually impaired participants, users gained a more accurate mental model in significantly shorter time by means of FM compared to AM and the HoloLens' usability was rated better than our LIDAR prototype's. These initial findings show possibilities for further improvement, so that similar approaches could be used more and better in blind and visually impaired peoples' everyday life.}, language = {en} } @inproceedings{GoetzelmannKreimeier2020, author = {G{\"o}tzelmann, Timo and Kreimeier, Julian}, title = {Towards the inclusion of wheelchair users in smart city planning through virtual reality simulation}, series = {Proceedings of the 13th ACM International Conference on PErvasive Technologies Related to Assistive Environments}, booktitle = {Proceedings of the 13th ACM International Conference on PErvasive Technologies Related to Assistive Environments}, publisher = {ACM}, address = {New York, NY, USA}, doi = {10.1145/3389189.3398008}, pages = {1 -- 7}, year = {2020}, abstract = {The planning of Smart Cities is a complex task. In particular, accessibility rules based on legal regulations but also on empirical values must be observed. However, it is difficult to determine in advance the exact needs of people with disabilities for concrete planning. Previous approaches mainly aimed at existing urban environments. Ideally, citizens should be directly involved in the planning process of buildings and urban environments. For existing urban environments, crowdsourcing approaches exist to obtain suggestions for improvement from citizens. We present a novel approach for the direct integration of wheelchair users in the urban environments to be planned (participatory urban development) in virtual reality. We present an easy-to-reproduce simulator that allows wheelchair users to directly explore the planned buildings and urban environments in a virtual, spatial environment. This means that these 3D models can be commented already in the planning phase and provide valuable information about accessibility.}, language = {en} }