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Network optimization in railway transport planning
(2017)This work is dealing with train timetabling problem. In the first chapter, one can find an introduction to network flows which is needed for understanding deeper concepts later on. Namely, basic graph theory definitions are stated as well as core problems like the minimum cost flow and shortest path problem. Furthermore, two equivalent representations of network flows are described, including some useful properties connected to each of ...Master Thesis -
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Modeling and Implementing High Performance Programs on FPGA
(2016)This work investigates the potential of high performance computing (HPC) on fieldprogrammable gate arrays (FPGAs), highlighting concepts and programming techniques to pursue performance using high level synthesis (HLS) tools. We compute the peak single precision floating point performance on the AlphaData 7V3 board using a model of replicated processing elements, then implement a benchmark to verify the predicted performance in ...Master Thesis -
Unravelling Urban Pedestrian Trips: Developing a new pedestrian route choice model estimated from revealed preference GPS data
(2015)Walking is very important in our lives: for millions of years, walking has been the most basic mode of transport. However, much less research has been done on walking and pedestrians compared to motorised vehicular modes. Especially pedestrian’s route choice behaviour is an interesting topic in research. Knowledge about pedestrian’s route choice behaviour is sparse, while this knowledge is very relevant for planning and designing public ...Master Thesis -
Dynamic Online Trajectory Generation - Acceleration Capabilities Considered for Real-Time Path Planning
(2013)A concept of online trajectory generation for robot motion control systems enabling instantaneous reactions to unforeseen sensor events was introduced in former publications. This thesis extends the existing concept by allowing time-variant kinematic motion constraints being applied online to the algorithms, so that low-level trajectory parameters can now be changed abruptly, and the system can react instantaneously within the same control ...Master Thesis -
Processing low-frequency floating cardata for transportation applications
(2013)During the previous decade and onwards, utilizing GPS probe data coming from fleet management systems, as floating car data (FCD), has attracted a lot of attention. However, the particularity of processing this kind of data is that they are relatively sparse in time and space. As a consequence, identifying the followed path between consecutive GPS probes involves high uncertainty. Map-matching process facilitates the transformation of ...Master Thesis -
Congestion pricing schemes controlled by the gMFD: a comprehensive design and appraisal to bridge the engineering and economic perspective
(2013)Charging drivers for the congestion they cause is a well-known concept among economists, traffic engineers and transport professionals. Many studies have been performed to explore and better address this issue during the history of transport economics and in recent years the first congestion pricing schemes have been finally implemented in some cities (Singapore, London, Stockholm). Nonetheless, several theoretical and practical problems ...Master Thesis