Alexander Sohr

Learn More
Floating Car Data (FCD) fleets are a valuable data source to obtain travel times as basis for traffic information or route guidance systems. To deliver reliable traffic information and to improve algorithms and systems for generating FCD from GPS positions their current quality has to be evaluated first. In this contribution the travel times from actual(More)
With current on-board GPS devices a lot of data is being collected while operating taxis. This paper focuses on analysing travel behaviour and vehicle supply of the Berlin taxi market using floating car data (FCD) for one week each in 2013 and 2014. The data suggests that there is generally a demand peak on workday mornings and a second peak over a longer(More)
Ovarian activity not only influences fertility, but is also involved with the regulation of division of labour between reproductive and behavioural castes of female honey bees. In order to identify candidate genes associated with ovarian activity, we compared the gene expression patterns between inactivated and activated ovaries of queens and workers by(More)
During the last nine years, a couple of prototype ITS applications based on Floating Car Data (FCD) of taxi fleets have been developed at German Aerospace Center (DLR). A core application is a route guidance and monitoring system based on current and historical road segment travel times. Recently, it has been extended for use in the German funded project(More)
Precise short-term prediction of traffic parameters such as flow and travel-time is a necessary component for many ITS applications. This work describes the research on a novel, fast, and robust algorithm which is based on a partitioning cluster analysis. It is able to calculate travel times from Floating Car Data (FCD) for a whole city, even for minor(More)
void live() This method has to be implemented by agents. void action() This method can be triggered by the ‘ invokeActionMethod’. void afterCopy() Called after the agent was copied. void beforeCopy() Called before the agent is copied. void beforeRemove() Called before the agent is removed. Deliverable Agent Specification and Design IST – 1999 60016 © The(More)
  • Zijun Liang, Hong Chen, +4 authors Jan Trumpold
  • 2017
in this paper, real-time vehicular data from video traffic detection (VTD) are used for minimizing the travel delay at intersections and a real-time traffic optimization model, based on the SUMO traffic simulation software, is established accordingly. The proposed model is implemented in a small industrial control computer which serves as the communication(More)
Demand Responsive Transport (DRT) is a passenger-oriented branch of public transport, which consists of a group of passengers sharing a vehicle with flexible pick-up and drop-off locations and times. However, DRT systems are most of the time economically unfeasible, due to their difficulties on balancing costs and demand. The optimization problem associated(More)
  • 1