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Sökning: WFRF:(Johansson Johannes)

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  • Andersen, Kim, et al. (författare)
  • Maintenance and Reformation of News Repertoires: A Latent Transition Analysis
  • 2022
  • Ingår i: Journalism & Mass Communication Quarterly. - : SAGE Publications. - 1077-6990 .- 2161-430X. ; 99:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Today’s media environment provides people ample opportunities for constructing news habits fitting their preferences, but our knowledge about the dynamics of such news habits is limited. Using a four-wave panel survey from Sweden and taking a news repertoires approach, the study identifies four groups of news users labeled Public service-oriented traditionalists, Minimalists, Engaged pluralists, and Quality-oriented explorers, which are each related to news interest, trust in mainstream news media, and socio-demographic factors in distinct ways. The news repertoires are highly stable, even during profound contextual change, showing that people most often maintain their news habits and only seldom reform them.
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  • Borgström, Johannes, et al. (författare)
  • Broadcast psi-calculi with an application to wireless protocols
  • 2015
  • Ingår i: Software and Systems Modeling. - : Springer. - 1619-1366 .- 1619-1374. ; 14:1, s. 201-216
  • Tidskriftsartikel (refereegranskat)abstract
    • Psi-calculi is a parametric framework for extensions of the pi-calculus, with arbitrary data structures and logical assertions for facts about data. In this paper we add primitives for broadcast communication in order to model wireless protocols. The additions preserve the purity of the psi-calculi semantics, and we formally prove the standard congruence and structural properties of bisimilarity. We demonstrate the expressive power of broadcast psi-calculi by modelling the wireless ad-hoc routing protocol LUNAR and verifying a basic reachability property.
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  • Borgström, Johannes, et al. (författare)
  • Broadcast Psi-calculi with an Application to Wireless Protocols
  • 2011
  • Ingår i: Software Engineering and Formal Methods. - Berlin, Heidelberg : Springer Berlin/Heidelberg. - 9783642246890 ; , s. 74-89
  • Konferensbidrag (refereegranskat)abstract
    • Psi-calculi is a parametric framework for extensions of the pi-calculus, with arbitrary data structures and logical assertions for facts about data. In this paper we add primitives for broadcast communication % to the psi-calculi framework. in order to model wireless protocols. The additions preserve the purity of the psi-calculi semantics, and we formally prove the standard congruence and structural properties of bisimilarity. We demonstrate the expressive power of broadcast psi-calculi by modelling the wireless ad-hoc routing protocol LUNAR and verifying a basic reachability property.
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  • Callaghan, Terry, et al. (författare)
  • Multi-Decadal Changes in Tundra Environments and Ecosystems : Synthesis of the International Polar Year-Back to the Future Project (IPY-BTF)
  • 2011
  • Ingår i: Ambio. - : Springer Science and Business Media LLC. - 0044-7447 .- 1654-7209. ; 40:6, s. 705-716
  • Tidskriftsartikel (refereegranskat)abstract
    • Understanding the responses of tundra systemsto global change has global implications. Most tundraregions lack sustained environmental monitoring and oneof the only ways to document multi-decadal change is toresample historic research sites. The International PolarYear (IPY) provided a unique opportunity for such researchthrough the Back to the Future (BTF) project (IPY project#512). This article synthesizes the results from 13 paperswithin this Ambio Special Issue. Abiotic changes includeglacial recession in the Altai Mountains, Russia; increasedsnow depth and hardness, permafrost warming, andincreased growing season length in sub-arctic Sweden;drying of ponds in Greenland; increased nutrient availabilityin Alaskan tundra ponds, and warming at mostlocations studied. Biotic changes ranged from relativelyminor plant community change at two sites in Greenland tomoderate change in the Yukon, and to dramatic increasesin shrub and tree density on Herschel Island, and in subarcticSweden. The population of geese tripled at one sitein northeast Greenland where biomass in non-grazed plotsdoubled. A model parameterized using results from a BTFstudy forecasts substantial declines in all snowbeds andincreases in shrub tundra on Niwot Ridge, Colorado overthe next century. In general, results support and provideimproved capacities for validating experimental manipulation,remote sensing, and modeling studies.
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