TY - JOUR A1 - Taefi, Tessa A1 - Stütz, Sebastian A1 - Fink, Andreas T1 - Assessing the cost-optimal mileage of medium-duty electric vehicles with a numeric simulation approach JF - Transportation research : an international journal / Part D, Transport and environment N2 - Electric freight vehicles have the potential to mitigate local urban road freight transport emissions, but their numbers are still insignificant. Logistics companies often consider electric vehicles as too costly compared to vehicles powered by combustion engines. Research within the body of the current literature suggests that increasing the driven mileage can enhance the competitiveness of electric freight vehicles. In this paper we develop a numeric simulation approach to analyze the cost-optimal balance between a high utilization of medium-duty electric vehicles – which often have low operational costs – and the common requirement that their batteries will need expensive replacements. Our work relies on empirical findings of the real-world energy consumption from a large German field test with medium-duty electric vehicles. Our results suggest that increasing the range to the technical maximum by intermediate (quick) charging and multi-shift usage is not the most cost-efficient strategy in every case. A low daily mileage is more cost-efficient at high energy prices or consumptions, relative to diesel prices or consumptions, or if the battery is not safeguarded by a long warranty. In practical applications our model may help companies to choose the most suitable electric vehicle for the application purpose or the optimal trip length from a given set of options. For policymakers, our analysis provides insights on the relevant parameters that may either reduce the cost gap at lower daily mileages, or increase the utilization of medium-duty electric vehicles, in order to abate the negative impact of urban road freight transport on the environment. KW - electric vehicles KW - urban freight transport KW - total cost of ownership KW - energy consumption KW - real-world Y1 - 2017 U6 - http://dx.doi.org/10.1016/j.trd.2017.08.015 SN - 1361-9209 VL - 56 SP - 271 EP - 285 PB - Elsevier CY - Amsterdam ER - TY - CHAP A1 - Will, Devid A1 - Eckstein, Lutz A1 - Bargen, Steven von A1 - Taefi, Tessa A1 - Galbas, Roland T1 - State of the art analysis for connected and automated driving within the SCOUT project T2 - ITS World Congress 2017 Montreal, October 29 – November 2 N2 - This publication gives a short introduction and overview of the European project SCOUT and introduces a methodology for a holistic approach to record the state of the art in technical (vehicle and connectivity, human factors regarding physiologic and ergonomic level) and non-technical enablers (societal, economic, legal, regulatory and policy level) of connected and automated driving in Europe. The paper addresses beside the technical topics of environmental perception, E/E architecture, actuators and security, the state of the art of the legal framework in the context of connected and automated driving. KW - connected and automated driving KW - state of the art analysis KW - connectivity KW - security KW - legal Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bsz:rt2-opus4-17090 UR - https://connectedautomateddriving.eu/wp-content/uploads/2017/11/Paper-ID-EU-TP1129-ITS-WC-2017-SCOUT.pdf SP - 1 EP - 8 ER - TY - CHAP A1 - Vafiadis, Nico A1 - Taefi, Tessa T1 - Differentiating blockchain technology to optimize the processes quality in industry 4.0 T2 - IEEE 5th World Forum on Internet of Things : conference proceedings : 15-18 April 2019, Limerick, Ireland N2 - The complexity of supply chains increases, especially due to the geographical spread of supplier and customer networks. In the connected and automated supply chains of the industry 4.0, even more nodes are incorporated in supply chains. This paper discusses the possible improvement of process quality in the industry 4.0 through the different blockchain and distributed ledger technologies. We derived hypotheses from a literature review and asked German blockchain experts from the industry to validate and discuss the hypotheses. We find that the different blockchain technologies and consensus algorithms have different strength with regard to quality improvement. One central finding is that IOTA, developed especially for the IoT and deemed the ’next evolutionary step’ is scalable and hence may increase the process efficiency, but at the same time is more vulnerable than other blockchain implementations, which again may reduce the overall process quality. KW - blockchain KW - industry 4.0 KW - industrial IoT KW - process quality Y1 - 2019 SN - 978-1-5386-4980-0 U6 - http://dx.doi.org/10.1109/WF-IoT.2019.8767288 SP - 864 EP - 869 PB - IEEE CY - Piscataway, NJ ER - TY - JOUR A1 - Kazmaier, Markus A1 - Taefi, Tessa A1 - Hettesheimer, Tim T1 - Techno-economical and ecological potential of electric scooters : a life cycle analysis JF - European journal of transport and infrastructure research : EJTIR N2 - In Germany, mobility is currently in a state of flux. Since June 2019, electric kick scooters (e-scooters) have been permitted on the roads, and this market is booming. This study employs a user survey to generate new data, supplemented by expert interviews to determine whether such e-scooters are a climate-friendly means of transport. The environmental impacts are quantified using a life cycle assessment. This results in a very accurate picture of e-scooters in Germany. The global warming potential of an e-scooter calculated in this study is 165 g CO2-eq./km, mostly due to material and production (that together account for 73% of the impact). By switching to e-scooters where the battery is swapped, the global warming potential can be reduced by 12%. The lowest value of 46 g CO2-eq./km is reached if all possibilities are exploited and the life span of e-scooters is increased to 15 months. Comparing these emissions with those of the replaced modal split, e-scooters are at best 8% above the modal split value of 39 g CO2-eq./km. KW - e-scooter KW - e-mobility KW - micromobility KW - urban mobility KW - shared mobility KW - first and last mile connectivity KW - LCA Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bsz:rt2-opus4-28552 SN - 1567-7141 VL - 20 IS - 4 SP - 233 EP - 251 PB - Delft University of Technology CY - Delft ER -