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- Elamalayil Soman, Deepak, et al.
(författare)
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Discontinuous conduction mode of a three-level boost DC-DC converter and its merits and limits for voltage cross regulation applications
- 2014
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Ingår i: Proceedings, IECON 2014 - 40th Annual Conference of the IEEE Industrial Electronics Society. - : IEEE conference proceedings. - 9781479940325 ; , s. 4268-4272
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Konferensbidrag (refereegranskat)abstract
- Distributed generation and smart grid integration of renewable energy sources introduce a lot of challenges for the enabling power electronic converter technology. Some of these challenges include wide controllability range, high power handling and good reliability. Three-level boost converter is one of the attractive solution for applications requiring voltage cross regulation such as three-level neutral point clamped inverter based grid integration of renewable sources. The present work shows the advantages and disadvantages of using discontinuous conduction mode of a Three-level boost converter for voltage cross regulation. The converter working principle, modes of operation and operating cases are listed briefly. The simulation results compare the DCM and CCM cross regulation effects. Based on these results, the controllability range of the converter is analyzed to understand the suitability of the converter for various applications.
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- Ouacha, Aziz, et al.
(författare)
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Wideband multibeam antenna for integration in small platforms in EuCAP 2010 - The 4th European Conference on Antennas and Propagation, vol , issue , pp 5505825
- 2010
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Ingår i: EuCAP 2010 - The 4th European Conference on Antennas and Propagation.
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Konferensbidrag (refereegranskat)abstract
- A wideband multibeam antenna for integration in small platforms such as UAVs has been demonstrated. The demonstration was performed on a single facet comprising an 8×4 bowtie antenna elements array and a beamforming network which includes both transmitter and receiver chains and can therefore be used in multifunction systems for EW and communication. The operating frequency band chosen for this demonstrator is 6 - 15 GHz. Due to the modularity of the concept, the demonstrated facet can either be used stand alone or forming a faceted array depending on the required field of coverage and/or platform structure. A compact and lightweight phased array concept for 360o coverage is also discussed.
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- Samuelsson, S, et al.
(författare)
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Phonological and surface profiles of reading difficulties among very low birth weight children : Converging evidence for the developmental lag hypothesis.
- 2000
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Ingår i: Scientific Studies of Reading. - 1088-8438 .- 1532-799X. ; 4:3, s. 197-217
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Tidskriftsartikel (refereegranskat)abstract
- The purpose of this study was to test the developmental lag hypothesis, which assumes that a surface pattern of reading difficulties should be attributed to a general developmental delay rather than to specific deficits in the acquisition of orthographic decoding skills. We compared a sample of very low birth weight children (less than 1,500 g), known to be at higher risk of a general developmental delay, with a group of same-age, normal readers. Following the same regression-based procedures seen in the work of Castles and Coltheart (1993); Manis, Seidenberg, Doi, McBride-Chang, and Petersen (1996); and Stanovich, Siegel, and Gottardo (1997), we found that only 1 very low birth weight child could be classified as phonologically dyslexic, whereas 12 out of 60 very low birth weight children were identified as surface dyslexic. This subgroup of children with surface dyslexia was impaired not only in all reading measures employed in this study, but also in several behavioral domains associated with a developmental lag.
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- Smeds, K., et al.
(författare)
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Objective measures to quantify the perceptual effects of noise reduction in hearing aids
- 2011
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Ingår i: Proceedings of the AES International Conference. ; , s. 101-108
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Konferensbidrag (refereegranskat)abstract
- Twenty listeners with hearing impairment evaluated three noise-reduction algorithms using paired comparisons of speech clarity, noise loudness, and preference. The subjective test produces results in terms of physical signal-to-noise ratios that correspond to equal subjective performance with and without the noise-reduction algorithms. This facilitates a direct test of how well a number of objective performance measures correspond with the subjective test results.
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