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Sökning: WFRF:(Altman Sara)

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1.
  • Akbarzadeh, Sara, et al. (författare)
  • Self-organizing femtocell offloading at the flow level
  • 2013
  • Ingår i: International Journal of Network Management. - : Wiley. - 1055-7148 .- 1099-1190. ; 23:4, s. 259-271
  • Tidskriftsartikel (refereegranskat)abstract
    • Femtocell technology is expected to be fully self-managed, empowered by self-organizing network functionalities. This paper proposes a solution for self-optimized offloading of macrocell traffic towards open/hybrid-access femtocells. A heterogeneous network comprising macro- and femtocells is modeled as parallel queues. The coverage area of the femtocells is self-optimized by dynamically adapting their pilot powers. A simple update equation for the pilot power is given and its convergence is studied using stochastic approximation techniques. The algorithm balances the load among the cells to improve network capacity. Simulation results illustrate the important performance gains brought about by the proposed scheme, using a dynamic network simulator.
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2.
  • Hardwicke, Tom E., et al. (författare)
  • Data availability, reusability, and analytic reproducibility : evaluating the impact of a mandatory open data policy at the journal Cognition
  • 2018
  • Ingår i: Royal Society Open Science. - : The Royal Society. - 2054-5703. ; 5:8
  • Tidskriftsartikel (refereegranskat)abstract
    • Access to data is a critical feature of an efficient, progressive and ultimately self-correcting scientific ecosystem. But the extent to which in-principle benefits of data sharing are realized in practice is unclear. Crucially, it is largely unknown whether published findings can be reproduced by repeating reported analyses upon shared data ('analytic reproducibility'). To investigate this, we conducted an observational evaluation of a mandatory open data policy introduced at the journal Cognition. Interrupted time-series analyses indicated a substantial post-policy increase in data available statements (104/417, 25% pre-policy to 136/ 174, 78% post-policy), although not all data appeared reusable (23/ 104, 22% pre-policy to 85/136, 62%, post-policy). For 35 of the articles determined to have reusable data, we attempted to reproduce 1324 target values. Ultimately, 64 values could not be reproduced within a 10% margin of error. For 22 articles all target values were reproduced, but 11 of these required author assistance. For 13 articles at least one value could not be reproduced despite author assistance. Importantly, there were no clear indications that original conclusions were seriously impacted. Mandatory open data policies can increase the frequency and quality of data sharing. However, suboptimal data curation, unclear analysis specification and reporting errors can impede analytic reproducibility, undermining the utility of data sharing and the credibility of scientific findings.
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