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Author

  • German, Reinhard (7)
  • Sommer, Christoph (3)
  • Bazan, Peter (2)
  • Dressler, Falko (2)
  • Eckhoff, David (2)
  • Hielscher, Kai-Steffen (2)
  • Karl, Jürgen (2)
  • Pruckner, Marco (2)
  • Scharrer, Daniel (2)
  • Will, Stefan (2)
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Year of publication

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  • 2010 (3)
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  • electricity storage (2)
  • heat pump (2)
  • heat storage (2)
  • Ad-hoc-Netz (1)
  • CAN bus (1)
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Adaptive Beaconing for Delay-Sensitive and Congestion-Aware Traffic Information Systems (2010)
Sommer, Christoph ; German, Reinhard ; Dressler, Falko
We present a new car-to-X communication protocol, Adaptive Traffic Beacon (ATB), which supports the exchange of delay-sensitive traffic information in a wide range of scenarios by flexibly adapting to the availability of infrastructure elements as well as to the network load. From previous work, we see that centralized solutions and flooding based approaches each show benefits and drawbacks depending on traffic density, penetration, network utilization, and other parameters. This observation is in line with findings about intelligent transportation systems that have been developed for specific settings. In order to overcome this limitation, we designed ATB to be adaptive in two dimensions: First, the beacon interval is adapted dynamically and, secondly, the protocol can dynamically make use of available infrastructure elements. We concentrate on a Traffic Information System (TIS) with a focus on congestion-aware communication. Simulation experiments clearly demonstrate that ATB performs well in a broad range of settings. It maintains a non-congested wireless channel to prevent collisions during TIS data exchange.
A Computationally Inexpensive Empirical Model of IEEE 802.11p Radio Shadowing in Urban Environments (2010)
Sommer, Christoph ; Eckhoff, David ; German, Reinhard ; Dressler, Falko
We present a realistic, yet computationally inexpensive simulation model for IEEE 802.11p radio shadowing in urban environments. Based on real world measurements using IEEE 802.11p/DSRC devices, we estimated the effect that buildings and other obstacles have on the radio communication between vehicles. Especially for evaluating safety applications in the field of Vehicular Ad Hoc Networks (VANETs), stochastic models are not sufficient for evaluating the radio communication in simulation. Motivated by similar work on WiFi measurements, we therefore created an empirical model for modeling buildings and their properties to accurately simulate the signal propagation. We validated our model using real world measurements in a city scenario for different types of obstacles. Our simulation results show a very high accuracy when compared with the measurement results, while only requiring a marginal overhead in terms of computational complexity.
Spezifikation und Implementation des CAN-Arbitrierungsverfahrens in UPPAAL (2010)
Kresic, Dario ; Hielscher, Kai-Steffen ; German, Reinhard
In dieser Arbeit stellen wir eine durch Zeitautomaten modellierte Spezifikation des Mediumzugriffs im CAN-Protokoll vor sowie ihre Implementierung in UPPAAL. Zeitliche Anforderungen wurden dabei durch entsprechende Uhren-Nebenbedingungen erfasst. Dieses Zeitautomaten-Modell wurde anschließend automatisch verifiziert (Model Checking), wobei mehrere Anforderungen identifiziert wurden, die das CAN Protokoll erfüllen muß (wie Deadlock-Freiheit des Modells, Übertragungsrecht für die höchstpriore Nachricht, exklusives Übertragungsrecht für beliebigen CAN-Adapter nach der gewonnenen Arbitrage etc.). All diese Eigenschaften wurden in einer Variante der temporalen Logik CTL spezifiziert; die automatische Verifikation selbst wurde dabei mit UPPAAL durchgeführt, einem Model Checker für zeitautomaten-basierte Modelle.
Medien unter Kontrolle (2009)
Jäggi, Carola ; Meier, Daniel ; Nagy, Ursula ; Bläsi, Christoph ; German, Reinhard ; Kammerl, Rudolf ; Dickel, Hans ; Ruchatz, Jens ; Schoenmakers, Henri ; Westphalen, Joseph von ; Haberer, Johanna ; Schneider, Norbert
Die vorliegende Online-Publikation fasst die Vorträge einer im WS 2007/08 gehaltenen Universitätsringvorlesung gleichen Titels an der Friedrich-Alexander-Universität Erlangen-Nürnberg zusammen und ergänzt sie durch nachträglich eingeworbene Beiträge. Die Ringvorlesung wie auch diese Publikation wurden organisiert vom Interdisziplinären Medienwissenschaftlichen Zentrum (IMZ), einem Forschungs- und Nachwuchsförderungsverbund der medienbezogenen Fächer an der Universität Erlangen-Nürnberg. Professorinnen und Professoren sowie NachwuchswissenschaftlerInnen der Fächer Buchwissenschaft, Christliche Publizistik, Christliche Archäologie, Klassische Archäologie, Kommunikationswissenschaft, Kunstgeschichte, Medienwissenschaft, Multimedia-Didaktik und Theaterwissenschaft forschen hierin selbstorganisiert an den Schnittstellen fächerübergreifend relevanter Fragestellungen der Medientheorie, -praxis, -ethik und -didaktik und führen auch den jeweiligen wissenschaftlichen Nachwuchs frühzeitig an entsprechende interdisziplinäre Arbeitsfelder heran. Der Zusammenschluss trägt dem Umstand Rechnung, dass Medien inzwischen ein primäres Bezugsfeld vieler Disziplinen darstellen, die aus je eigener Perspektive Fragen nach den Funktionen, Verwendungshinsichten, möglichen Wirkungen und Entwicklungstendenzen von Medien in einer sich immer stärker als Medien- und Kommunikationsgesellschaft verstehenden Gesellschaft generieren. Einen Überblick über Zusammensetzung und Aktivitäten des IMZ bietet die Homepage unter http://www.imz.uni-erlangen.de.
Proceedings of the 5th GI/ITG KuVS Fachgespräch Inter-Vehicle Communication (FG-IVC 2017) (2017)
Djanatliev, Anatoli ; Hielscher, Kai-Steffen ; Sommer, Christoph ; Eckhoff, David ; German, Reinhard
Proceedings of the 5th GI/ITG KuVS Fachgespräch Inter-Vehicle Communication (FG-IVC 2017) An updated version of the PDF file can be found here: http://fg-ivc.car2x.org/proceedings-fg-ivc-2017.pdf
Reversible Heat Pump−Organic Rankine Cycle Systems for the Storage of Renewable Electricity (2018)
Staub, Sebastian ; Bazan, Peter ; Braimakis, Konstantinos ; Müller, Dominik ; Regensburger, Christoph ; Scharrer, Daniel ; Schmitt, Bernd ; Steger, Daniel ; German, Reinhard ; Karellas, Sotirios ; Pruckner, Marco ; Schlücker, Eberhard ; Will, Stefan ; Karl, Jürgen
Storage of electricity from fluctuating renewable energy sources has become one of the predominant challenges in future energy systems. A novel system comprises the combination of a heat pump and an Organic Rankine Cycle (ORC) with a simple hot water storage tank. The heat pump upgrades low temperature heat with excess power. The upgraded heat can drive an Organic Rankine Process using the heat pump in reverse operation mode. This approach allows a comparably efficient storage of excess electricity. Waste heat sources usually do not qualify for electricity production even with ORC processes due to low temperatures. Upgrading the temperature of the waste heat by means of excess electricity makes the use of an ORC feasible in order to recover the electricity input. Thermodynamic cycle simulations with IPSEpro software outline that the process provides power-to-power efficiencies in a range of 50% for small-scale applications based on commercially available heat pump components. The isentropic efficiency of compressors/expanders plays a crucial role on the system performance. Applications of the proposed cycle in the megawatt range with more efficient turbines and dynamic compressors will therefore increase the power-to-power efficiency to above 70%.
Life Cycle Assessment of a Reversible Heat Pump−Organic Rankine Cycle−Heat Storage System with Geothermal Heat Supply (2020)
Scharrer, Daniel ; Eppinger, Bernd ; Schmitt, Pascal ; Zenk, Johan ; Bazan, Peter ; Karl, Jürgen ; Will, Stefan ; Pruckner, Marco ; German, Reinhard
The life cycle assessment of components is becoming increasingly important for planning and construction. In this paper, a novel storage technology for excess electricity consisting of a heat pump, a heat storage and an organic rankine cycle is investigated with regards to its environmental impact. Waste heat is exergetically upgraded, stored in a hot water storage unit and afterwards reconverted to electricity when needed. Such a pilot plant on a lab scale is currently built in Germany. The first part of this paper focuses on geothermal energy as a potential heat source for the storage system and its environmental impact. For a large scale application, geothermal hotspots in Germany are further investigated. The second part analyzes the storage technology itself and compares it to the impacts of commonly used battery storage technologies. Especially during the manufacturing process, significantly better global warming potential values are shown compared to lithium-ion and lead batteries. The least environmental impact while operating the system is with wind power, which suggests an implementation of the storage system into the grid in the northern part of Germany.
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