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- Zinser, Markus, et al.
(författare)
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Comparison of microscopic and macroscopic approaches to simulating the effects of infrastructure disruptions on railway networks
- 2018
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Ingår i: Proceedings of 7th Transport Research Arena TRA 2018, April 16-19, 2018, Vienna, Austr. - : Zenodo.
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Konferensbidrag (refereegranskat)abstract
- The current state-of-the-art in timetable analysis in the presence of disruptions is to use railway microsimulation, which typically yields detailed results on infrastructure or timetable performance. However, micro-simulation is time-consuming and requires a detailed infrastructure model. This paper outlines a macroscopic approach which aims at reducing execution time by restricting the level of detail to high-level relations between significant events. In particular, the effect of disruptions is modelled by sampling delay times from probability distributions obtained from historical data. In this paper, we test whether this approach, given common disruption scenarios, still allows accurate results on delays to be obtained. Two disruption scenarios were simulated in RailSys and with the new method, using limited parameter tuning. In the results, visually similar delay distributions were observed. Although there is some room for improvements in accuracy, the new approach appears promising, and we found no evidence against its suitability in the presence of disruptions.
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| 3. |
- Albert, Andreas, et al.
(författare)
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Recommendations of the LHC Dark Matter Working Group : Comparing LHC searches for dark matter mediators in visible and invisible decay channels and calculations of the thermal relic density
- 2019
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Ingår i: Physics of the Dark Universe. - : Elsevier BV. - 2212-6864. ; 26
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Tidskriftsartikel (refereegranskat)abstract
- Weakly-coupled TeV-scale particles may mediate the interactions between normal matter and dark matter. If so, the LHC would produce dark matter through these mediators, leading to the familiar “mono-X” search signatures, but the mediators would also produce signals without missing momentum via the same vertices involved in their production. This document from the LHC Dark Matter Working Group suggests how to compare searches for these two types of signals in case of vector and axial-vector mediators, based on a workshop that took place on September 19/20, 2016 and subsequent discussions. These suggestions include how to extend the spin-1 mediated simplified models already in widespread use to include lepton couplings. This document also provides analytic calculations of the relic density in the simplified models and reports an issue that arose when ATLAS and CMS first began to use preliminary numerical calculations of the dark matter relic density in these models.
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| 4. |
- Zinser, Markus, et al.
(författare)
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PRISM: A Macroscopic Monte Carlo Railway Simulation
- 2019
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Ingår i: Proceedings of The 12th World Congress on Railway Research (WCRR).
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Konferensbidrag (refereegranskat)abstract
- The current state-of-the-art in timetable analysis in the presence of disturbances is to use railway microsimulation, which typically yields detailed results on infrastructure or timetable performance. However, microscopic simulation is time-consuming and requires a detailed infrastructure model and expert knowledge to run adequately. This paper outlines a macroscopic approach which aims at reducing execution time by restricting the level of detail. A first prototype was developed which is able simulate one day of operation on the German railway network with about 40,000 trains in less than a minute. The approach has been studied in detail on that network. Several years of operational data have been analyzed to generate input for the macroscopic simulation. In the results, we describe our analysis tools and compare distributions of the simulation to operational data. It was found that the simulation describes real operational train data very well.
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