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Sökning: WFRF:(Hahn Sören)

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1.
  • Belote, R. T., et al. (författare)
  • Mammal species composition reveals new insights into Earth's remaining wilderness
  • 2020
  • Ingår i: Frontiers in Ecology and the Environment. - : Wiley. - 1540-9295 .- 1540-9309. ; 18:7, s. 376-383
  • Tidskriftsartikel (refereegranskat)abstract
    • Maps of the human footprint allow ecologists to identify the wildest lands on the planet, track their decline, and prioritize wildland conservation efforts. Other research efforts have mapped biological intactness and identified conservation priorities to protect biodiversity. However, little research has involved the use of historical references to evaluate intactness of species composition globally. We used a dataset estimating historical and current distributions of mammals to address whether the wildest places on Earth support the most intact mammal communities. Contrary to our expectations, we found that the global human footprint was not strongly correlated with mammal community intactness and uncovered surprising situations where both the human footprint and mammal species intactness were high, and other examples where both were low. Our results could be used to enhance maps and estimates of global wilderness areas by identifying wild and intact regions, while also prioritizing conservation of intact but human-modified landscapes. © The Ecological Society of America
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3.
  • Peng, Bile, 1985, et al. (författare)
  • Statistical Characteristics Study of Human Blockage Effect in Future Indoor Millimeter and Sub-millimeter Wave Wireless Communications
  • 2018
  • Ingår i: IEEE Vehicular Technology Conference. - 1550-2252.
  • Konferensbidrag (refereegranskat)abstract
    • The millimeter and sub-millimeter wave communication is a promising solution to future indoor multi-gigabit wireless communications because of its huge available bandwidth. One of the key difficulties is the human blockage effect since the human body can no longer be considered as being "transparent" as at lower frequencies. In this paper a study of statistical characteristics of this problem is presented. At first, broadband measurements of human blockage are provided. Afterwards, a realis- tic mobility model for indoor movements of humans is adopted and elliptic cylinders are applied to approximate human bodies in ray-launching simulations. Consequently, the distributions of Line-Of-Sight (LOS) path and blockage durations as well as blockage numbers are obtained by simulations. Finally, the system performance in presence of the distributed antennas is evaluated.
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4.
  • 2019
  • Tidskriftsartikel (refereegranskat)
  •  
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