Alexander Sohr

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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)
Executive summary Task 1.2 specifies and designs the agents of a PABADIS system, namely the Product Agents, Residential Agents, and Plant Management Agents, with respect to the technologies used for it. However, this kind of design and specification relates to the determination of an agent platform that fits into the PABADIS system requirements. For this(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)
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)
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)
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