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  • 11
    Online-Ressource
    Online-Ressource
    Forschungszentrum Julich, Zentralbibliothek ; 2020
    In:  Collective Dynamics Vol. 5 ( 2020-03-27)
    In: Collective Dynamics, Forschungszentrum Julich, Zentralbibliothek, Vol. 5 ( 2020-03-27)
    Kurzfassung: In most agent-based simulators, pedestrians navigate from origins to destinations. Consequently, destinations are essential input parameters to the simulation. While many other relevant parameters as positions, speeds and densities can be obtained from sensors, like cameras, destinations cannot be observed directly. Our research question is: Can we obtain this information from video data using machine learning methods? We use density heatmaps, which indicate the pedestrian density within a given camera cutout, as input to predict the destination distributions. For our proof of concept, we train a Random Forest predictor on an exemplary data set generated with the Vadere microscopic simulator. The scenario is a crossroad where pedestrians can head left, straight or right. In addition, we gain first insights on suitable placement of the camera. The results motivate an in-depth analysis of the methodology.
    Materialart: Online-Ressource
    ISSN: 2366-8539
    Sprache: Unbekannt
    Verlag: Forschungszentrum Julich, Zentralbibliothek
    Publikationsdatum: 2020
    ZDB Id: 2854776-7
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 12
    Online-Ressource
    Online-Ressource
    Springer Science and Business Media LLC ; 2022
    In:  Archives of Environmental Contamination and Toxicology Vol. 83, No. 2 ( 2022-08), p. 129-141
    In: Archives of Environmental Contamination and Toxicology, Springer Science and Business Media LLC, Vol. 83, No. 2 ( 2022-08), p. 129-141
    Kurzfassung: The goal of our study was to examine the effects of low abundances of nylon fibers on feeding rates of calanoid copepods (Crustacea, Copepoda) and doliolids (Tunicata, Thaliacea) in the presence of diatoms at near environmental concentration levels. In addition, we examined microscopically the fecal pellets produced by copepods and doliolids in the presence of fibers. Adult females of the calanoid Eucalanus pileatus and early gonozooids of Dolioletta gegenbauri (both of similar dry weight) cleared the diatom Rhizosolenia alata at similar rates. Nylon fibers were cleared at higher rates by Dolioletta gegenbauri compared to Eucalanus pileatus . Examination of fecal pellets revealed that copepods and doliolids could ingest the about 300 µm long fibers. The latter also ingested the occasionally occurring fibers of  〉  1 mm length. It appears that in seawater fiber abundances of about seven fibers ml −1 did not have a negative effect on feeding of either E. pileatus or D. gegenbauri . As doliolids and copepods remove plastic fibers from seawater by packing them into their pellets, they might play a role in the reduction of microplastic pollution and the microplastic transfer from the water column to the seafloor. Calanoid copepods may limit ingesting fibers by not perceiving them, as compared to doliolids which do not seem to be able to avoid ingesting them.
    Materialart: Online-Ressource
    ISSN: 0090-4341 , 1432-0703
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 2022
    ZDB Id: 185986-9
    ZDB Id: 1458449-9
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 13
    Online-Ressource
    Online-Ressource
    Springer Science and Business Media LLC ; 2020
    In:  Archives of Environmental Contamination and Toxicology Vol. 78, No. 1 ( 2020-01), p. 94-105
    In: Archives of Environmental Contamination and Toxicology, Springer Science and Business Media LLC, Vol. 78, No. 1 ( 2020-01), p. 94-105
    Materialart: Online-Ressource
    ISSN: 0090-4341 , 1432-0703
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 2020
    ZDB Id: 185986-9
    ZDB Id: 1458449-9
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
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