SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Zetterberg H) ;lar1:(cth)"

Sökning: WFRF:(Zetterberg H) > Chalmers tekniska högskola

  • Resultat 1-3 av 3
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Zaidi, A. A., et al. (författare)
  • A Preliminary Study on Waveform Candidates for 5G Mobile Radio Communications Above 6 GHz
  • 2016
  • Ingår i: IEEE Vehicular Technology Conference. - 1550-2252. ; 2016-July
  • Konferensbidrag (refereegranskat)abstract
    • This paper provides an overview and preliminary comparison of several multi-carrier and single-carrier waveforms that are potential candidates for future 5G mobile radio communications above 6 GHz. The waveforms are assessed primarily based on the established and known results as well as recent findings keeping in view the design requirements that are relevant to using frequencies above 6 GHz, especially the millimeter wave frequencies. The Key Performance Indicators and degrees of freedom in the design of different waveforms and their potential applications for mm-wave communications are discussed. Certain features that are particularly interesting for mm-wave communication and require further investigations are also highlighted. Furthermore, a common framework for synthesizing different waveform candidates has been developed. Finally, a preliminary qualitative comparison of different multicarrier and single carrier waveforms has been derived.
  •  
2.
  • Zetterberg, P., et al. (författare)
  • Initial multi-node and antenna transmitter and receiver architectures and schemes; Deliverable D5.1
  • 2016
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • This deliverable provides the initial concepts and solutions from the technical work related to multi-antenna and multi-node transceiver schemes in millimetre wave (denoted as 6-100GHz) spectrum. It also briefly presents the use cases on which the work will be based and categorises the solutions in terms of their applicability to access, backhaul and relay deployments. Another important contribution from this report is the modelling of the hardware impairments in millimetre wave transceivers and the analysis of their impact on system performance.
  •  
3.
  • Valur Dansson, Hákon, 1993, et al. (författare)
  • Predicting progression and cognitive decline in amyloid-positive patients with Alzheimer's disease
  • 2021
  • Ingår i: Alzheimers Research & Therapy. - : Springer Science and Business Media LLC. - 1758-9193. ; 13:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Background In Alzheimer's disease, amyloid- beta (A beta) peptides aggregate in the lowering CSF amyloid levels - a key pathological hallmark of the disease. However, lowered CSF amyloid levels may also be present in cognitively unimpaired elderly individuals. Therefore, it is of great value to explain the variance in disease progression among patients with A beta pathology. Methods A cohort of n=2293 participants, of whom n=749 were A beta positive, was selected from the Alzheimer's Disease Neuroimaging Initiative (ADNI) database to study heterogeneity in disease progression for individuals with A beta pathology. The analysis used baseline clinical variables including demographics, genetic markers, and neuropsychological data to predict how the cognitive ability and AD diagnosis of subjects progressed using statistical models and machine learning. Due to the relatively low prevalence of A beta pathology, models fit only to A beta-positive subjects were compared to models fit to an extended cohort including subjects without established A beta pathology, adjusting for covariate differences between the cohorts. Results A beta pathology status was determined based on the A beta(42)/A beta(40) ratio. The best predictive model of change in cognitive test scores for A beta-positive subjects at the 2-year follow-up achieved an R-2 score of 0.388 while the best model predicting adverse changes in diagnosis achieved a weighted F-1 score of 0.791. A beta-positive subjects declined faster on average than those without A beta pathology, but the specific level of CSF A beta was not predictive of progression rate. When predicting cognitive score change 4 years after baseline, the best model achieved an R-2 score of 0.325 and it was found that fitting models to the extended cohort improved performance. Moreover, using all clinical variables outperformed the best model based only on a suite of cognitive test scores which achieved an R-2 score of 0.228. Conclusion Our analysis shows that CSF levels of A beta are not strong predictors of the rate of cognitive decline in A beta-positive subjects when adjusting for other variables. Baseline assessments of cognitive function accounts for the majority of variance explained in the prediction of 2-year decline but is insufficient for achieving optimal results in longer-term predictions. Predicting changes both in cognitive test scores and in diagnosis provides multiple perspectives of the progression of potential AD subjects.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-3 av 3

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy