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Träfflista för sökning "WFRF:(van der Hulst J. M.) srt2:(2011-2014)"

Sökning: WFRF:(van der Hulst J. M.) > (2011-2014)

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1.
  • Noorishad, P., et al. (författare)
  • Redundancy calibration of phased-array stations
  • 2012
  • Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 545, s. A108 (article no.)-
  • Tidskriftsartikel (refereegranskat)abstract
    • Aims. We assess the benefits and limitations of using the redundant visibility information in regular phased-array systems to improve the quality of the calibration. Methods. Regular arrays offer the possibility of using redundant visibility information to constrain the calibration of the array independently of a sky model and a beam model of the station elements. This requires a regular arrangement of the configuration of array elements and identical beam patterns. Results. We revised a previously developed calibration method for phased-array stations using the redundant visibility information in the system and applied it successfully to a LOFAR station. The performance and limitations of the method were demonstrated by comparing its application to real and simulated data. The main limitation is the mutual coupling between the station elements, which leads to non-identical beams and stronger baseline-dependent noise. Comparing the variance in the estimated complex gains with the Cramer-Rao Bound indicates that redundancy is a stable and optimum method for calibrating the complex gains of the system. Conclusions. Our study shows that the use of the redundant visibility does improve the quality of the calibration in phased-array systems. In addition, it provides a powerful tool obtaining system diagnostics. Our results demonstrate that designing redundancy in both the station layout and the array configuration of future aperture arrays is strongly recommended. This is particularly true in the case of the Square Kilometre Array (SKA) with its dynamic range requirement that surpasses any existing array by an order of magnitude.
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2.
  • Enajat, Morteza, et al. (författare)
  • The deep inferior epigastric artery perforator flap for autologous reconstruction of large partial mastectomy defects
  • 2011
  • Ingår i: Microsurgery. - : Wiley. - 0738-1085 .- 1098-2752. ; 31:1, s. 12-17
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Breast conservation surgery in the treatment of early stage breast cancer has become increasingly utilized as a means to avoiding mastectomy. While partial mastectomy defects (PMDs) may often be cosmetically acceptable, some cases warrant consideration of reconstructive options, and while several reconstructive options have been described in this role, a series of deep inferior epigastric perforator (DIEP) flaps has not been reported to date. Methods: A cohort of 18 patients undergoing PMD reconstruction with a DIEP flap were included. Patient-specific data, operation details, cosmetic results, and complication rates were assessed. Oncologic outcomes, in particular recurrence rates, were also evaluated. Results: In our series there were no cases of partial or total flap necrosis, and overall complications were low. There were two cases of wound infection (both had undergone radiotherapy), managed conservatively, and one case of reoperation due to hematoma. There were no cancer recurrences or effect on oncologic management. Cosmetic outcome was rated as high by both patients and surgeon. The results were thus comparable with other reconstructive options. Conclusion: Although autologous reconstruction has an established complication rate, our results suggest that the DIEP flap may be of considerable value for delayed reconstruction of selected larger partial mastectomy defects.
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