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Search: L773:1179 1608 > (2010-2014)

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1.
  • Melentyev, Oleg, et al. (author)
  • Computing the parameters of the discrete channel resulting under frequency hopping in the general case
  • 2013
  • In: Automation and remote control. - 0005-1179 .- 1608-3032. ; 74:7, s. 1128-1131
  • Journal article (peer-reviewed)abstract
    • We derive expressions for computing the parameters of the resulting discrete channel formed by frequency hopping between an arbitrary number of original channels defined by simple Markov chains for any hopping slot lengths. In obtaining the expressions, we aggregate the graph that described the hopping process. The expressions define transition probabilities of the graph defined by a Markov chain reduced to two states.
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2.
  • Tegelberg, Åke, et al. (author)
  • Improved cognitive functions after treatment with an oral appliance in obstructive sleep apnea
  • 2012
  • In: Nature and Science of Sleep. - : Dove Press. - 1179-1608. ; 4, s. 89-96
  • Journal article (peer-reviewed)abstract
    • Objective: The objective of this study was to evaluate the effect of oral appliance (OA) treatment on cognitive functions in patients with obstructive sleep apnea (OSA). Materials and methods: In a prospective study, 50 male patients with verified moderate-to-severe OSA received an OA with mandibular advancement. The cognitive functions assessed included working memory, vigilance, executive functioning, and mental pace, measured before as well as after 6 months of treatment. Somnography was used to measure physiological treatment effects. Forty-three patients completed the 6-month follow-up study. Results: All domains of cognitive functioning measured improved after 6 months of treatment with an OA (P < 0.001). The apnea/hypopnea- and oxygen desaturation-indices decreased significantly after treatment (P < 0.01). An obvious treatment response was reached in 60% of the patients, and 54% of the patients had recovered ie, had normalized breathing during sleep. Conclusion: OA with mandibular advancement is a treatment modality for the physiological symptoms of OSA, and may have a positive impact on cognitive functions, after only 6 months of treatment.
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