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Estimation of FECG power for effective electrodes placement in real-time non-invasive FECG extraction with OL-JADE
No full textImpact of the Approximated On-Line Centering and Whitening in OL-JADE on the Quality of the Estimated Fetal ECG
No full textOL-JADE is an on-line method for fetal ECG extraction from non-invasive potential recordings, able to work in real-time on a DSP. With respect to the original JADE algorithm, it exploits a recursive sample-by-sample approximated centering and whitening stage that partially violates the requirements of the subsequent JADE stage. In this paper this aspect is investigated showing a comparison with another similar algorithm, tracking BLISS, on artificial mixtures of real signals. OL-JADE presents a reduced complexity and, in case of time variances in the mixing process, permutations are confined to the involved sources. The imperfect centering and whitening have limited consequences in terms of signal distortions in presence of time variances, restricted to the time span of such variations
Real-Time Back-Projection of Fetal ECG Sources in OL-JADE for the Optimization of Blind Electrodes Positioning
No full textFetal ECG (FECG) extraction from non-invasive biopotential recordings is strongly affected by the intensity of the FECG contribution to the input signals. The higher the FECG contribution the higher the SNR and consequently the quality of the separation. The definition of a subjectspecific good electrodes positioning is an open issue. In this paper we present a technique based on the fetal ECG extraction algorithm OL-JADE, which tries to invert the whole blind extraction process only for the FECG estimated sources in order to estimate the FECG power at the electrodes. Due to the recursive sample-by-sample nature of the whitening stage of OL-JADE, an approximated Least Squares solution has been introduced in the backprojection scheme revealing adequate performance. An optimized version of the proposed method has been integrated with OL-JADE on a floating point DSP, guaranteeing the respect of the real-time bound
Medicina d'urgenza: il trasporto sanitario del PET. Aspetti burocratici ed organizzativi
No full textEffect of a hydrocolloid dressing on first intention healing surgical wounds in the dog: a pilot study
No full textObjectives To evaluate the efficacy of a hydrocolloid dressing for the treatment of surgical wounds in dogs. Methods Six healthy young female dogs of medium size and different breed underwent ovariohysterectomy. Histological evaluation was performed on biopsies taken from the edges of the wounds at day 7. The dressing was applied on one half of the wound according to manufacturer's instructions; the second half served as control. Biopsy specimens were fixed in a 10% formalin buffered solution pH 7.4, paraffin embedded and stained with haematoxylin and eosin. For clinical assessment, the presence and quality of exudate, erythema of the surrounding area, swelling and correct apposition of the wound margins were evaluated. Results The hydrocolloid dressing was easy to use. The clinical quality of the treated skin wounds was superior to the non-treated ones. Comparison of histological features between treated and untreated wounds showed a more regular organisation of the granulation tissue in the treated wounds, with fibroblasts being aligned parallel to the overlying epidermis. The number of inflammatory cells and the extension of granulation tissue were less prominent and less widespread in treated compared to untreated wounds. Conclusion The dressing performed very well in terms of adhesiveness and flexibility. It was useful in the management of surgical wounds to avoid contamination and ameliorate the epithelialisation rate and granulation tissue morphology of the surgical scar
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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