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Träfflista för sökning "WFRF:(Akhtar D) srt2:(2010-2014)"

Sökning: WFRF:(Akhtar D) > (2010-2014)

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1.
  • Cumpstey, Ian, et al. (författare)
  • Amine-linked diglycosides : Synthesis facilitated by the enhanced reactivity of allylic electrophiles, and glycosidase inhibition assays
  • 2011
  • Ingår i: Beilstein Journal of Organic Chemistry. - : Beilstein Institut. - 2195-951X .- 1860-5397. ; 7, s. 1-9
  • Tidskriftsartikel (refereegranskat)abstract
    • Diglycose derivatives, consisting of two monosaccharides linked at non-anomeric positions by a bridging nitrogen atom, have been synthesised. Conversion of one of the precursor monosaccharide coupling components into an unsaturated derivative enhances its electrophilicity at the allylic position, facilitating coupling reactions. Mitsunobu coupling between nosylamides and 2,3-unsaturated-4-alcohols gave the 4-amino-pseudodisaccharides with inversion of configuration as single regio- and diastereoisomers. A palladium-catalysed coupling between an amine and a 2,3-unsaturated 4-trichloroacetimidate gave a 2-amino-pseudodisaccharide as the major product, along with other minor products. Derivatisation of the C=C double bond in pseudodisaccharides allowed the formation of Man(N4-6)Glc and Man(N4-6)Man diglycosides. The amine-linked diglycosides were found to show weak glycosidase inhibitory activity.
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2.
  • De Nardis, L., et al. (författare)
  • Impact of mobility in cooperative spectrum sensing : Theory vs. simulation
  • 2012
  • Ingår i: Wireless Communication Systems (ISWCS), 2012 International Symposium on. - : IEEE. - 9781467307604 ; , s. 416-420
  • Konferensbidrag (refereegranskat)abstract
    • This work addresses the problem of cooperative spectrum sensing in cognitive radio networks, focusing on the impact of mobility on performance of cooperative sensing. First, a review of the most recent results on cooperative spectrum sensing is provided, resulting in the identification of measurement correlation and frame error rate in the reporting channel as the main parameters influencing the performance of cooperative sensing schemes. Next, the paper discusses the extension of the analysis to the case of mobile sensors, and determines the set of assumptions made in existing literature when taking into account mobility in sensing. The paper moves then to remove some of such assumptions, by presenting simulation results obtained in presence of realistic models for propagation in the considered area, as well as of a realistic mobility model. A comparison between theoretical derivation and simulation results shows that correlation among measurements taken by different sensors and the selected mobility model may significantly affect the sensing performance.
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