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Sökning: WFRF:(Emardson R.) > Övrigt vetenskapligt

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  • Berglund, Birgitta, et al. (författare)
  • Measurement of Perception : A European Network "Measuring the Impossible"
  • 2009
  • Ingår i: Proceedings of the 14th International Congress of Metrology : Added Value through Better Measurement. - Paris, France : Bureau international des poids et mesures, BIPM. ; s. 1-6
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • The European 'Measuring the Impossible'  Network MINET promotes new research activities in measurement dependent on human perception and/or interpretation. This includes the perceived attributes of products and services, such as quality or desirability, and societal parameters such as security and well-being. The main achievements so far include on-line consortium databases, research repository; workshops, think tanks, study visits; training course and book. The MINET consortium aims at consensus about how 'generic' metrological issues:  Measurement concepts & terminology, Measurement techniques, Measurement uncertainty, Decision-making & impact assessment, can be applied specifically to the 'Measurement of Persons' in terms of 'Man as a Measurement Instrument' and 'Measuring Man'.
  • Bergstrand, Sten, 1971-, et al. (författare)
  • Ionospheric Corrections for Accurate Positioning in Real Time
  • 2005
  • Ingår i: in Proc. Radio Science and Communication (RVK), eds. O. Gustafsson, P. Löwenborg, Linköping, Sweden, June 14-16, 2005. - 91-7056-122-2 ; s. 391-394
  • Konferensbidrag (övrigt vetenskapligt)
  • Elgered, Gunnar, 1955-, et al. (författare)
  • Validation of climate models using European ground-based GNSS observations
  • 2009
  • Ingår i: Proc. of 2nd Colloquium Scientific and Fundamental Aspects of the Galileo Programme, European Space Agency, 15-19 October, 2009, Padua, Italy. ; CD ROM
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • We summarize an ongoing research project where we assess the quality of time series of the Integrated Water Vapour in the atmosphere estimated from ground-based GNSS data for the application of validating and possibly improving climate models. The focus is on the factors limiting the accuracy and especially the long-term stability of the GNSS technique.Higher order ionospheric corrections have been studied, using realistic values for the Total Electron Content (TEC) close to the solar maximum in 2002. Averaged over ten days we find that the impact in the mean IWV is less than 0.1 kg/m^2. Another factor is the model used for antenna phase centre variations. We have studied this effect on the IWV estimates by simulations and by studying estimates of the IWV based on observed GPS signals. We find that ignoring satellite antenna phase variations, when processing GPS data from 2003-2008, can significantly influence the values of the estimated linear trends. The value depends on the latitude of the site as well as on the elevation cut-off angle used in the data analysis. Finally, we show a significant correlation between estimated linear trends in the IWV and the corresponding linear trends in the independently observed ground temperature.
  • Sundling, Catherine, et al. (författare)
  • New perspective on the accessibility of railway transport for the vulnerable traveller
  • 2013
  • Ingår i: Journal of Physics: Conference Series. - Institute of Physics Publishing (IOPP). - 1742-6588. ; 459:1, s. 012021
  • Tidskriftsartikel (övrigt vetenskapligt)abstract
    • Vulnerable travellers experience various problems in the transport environment. These may reduce public travel confidence and consequently lead to decreased mobility. A goal of our research is to find out how to improve the accessibility to railway travelling,especially,for persons with functional limitations. By reducing barriers, the ability of travelling would be improved, and consequently allow for more flexible travel behaviors. In order to develop a model and a method of measurement for accessibility, we (a) constructed a reference group of representative ‘typical older persons’ (65-85 years)from questionnaire data, and (b) developed an accessibility measure for persons with functional  limitations. In this measure barriers have different weights for the different persons depending on their functional ability and travel behavior. This gives the probability of facing a certain barrier when travelling to a certain destination; that is, a measure of accessibility for the individual. The more weight placed on a certain barrier,the less probable it is that the particular journey will take place. These weights will be obtained in forthcoming research on the perception of a set of various travel scenarios representing barriers.
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