| 1. |
- Malcus, Peter, et al.
(författare)
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Waveform Pattern Recognition – A New Semiquantitative Method for Analysis of Fetal Aortic and Umbilical Artery Blood Flow Velocity Recorded by Doppler Ultrasound
- 1991
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Ingår i: Ultrasound in Medicine and Biology. - 0301-5629. ; 17:5, s. 453-460
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Tidskriftsartikel (refereegranskat)abstract
- A semiquantitative computerized waveform pattern recognition system for analysis of the fetal descending aortic and umbilical artery Doppler flow velocity waveforms is presented. Based on empirically and manually selected clinical recordings from both vessels, 11 computerized and normalized standard curves for the aorta (type curves A to K), and 10 curves for the umbilical artery (type curves a to j) were constructed. The best match between the normalized waveform and the standard curve was based on either the degree of absent diastolic flow or, in cases with positive diastolic flow, on the calculation of the least square sum of the difference. The pattern recognition was tested against conventional waveform indices and our older semiquantitative Blood Flow Class (BFC) system in 472 clinical consecutive Doppler recordings. A good correlation was found. This new relatively simple computer-based method for waveform analysis is now prospectively applied in clinical studies.
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| 2. |
- Olofsson, S.K., et al.
(författare)
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Process simulation of wet filament winding and curing of thick walled cylinders
- 1992
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Ingår i: International SAMPE Symposium and Exhibition. - : SAMPE. - 0938994646 ; , s. 1132-1145
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Konferensbidrag (refereegranskat)abstract
- The present work concerns the development of a process model for wet filament winding of thick walled cylinders with a thermoset resin. The model calculates the fiber content, curing degree, temperature, stresses and strains throughout the process. The material laminae data are continuously updated by use of a micro-mechanical model. A reaction kinetics model for the used epoxy resin has been established. Plane compaction data on glassfiber rovings, for different winding angles, have been measured. A software supplied by Stanford University has been used as a basis for the numerical simulation. It has been extensively modified. Measurements have been performed on a 4-axis, numerically controlled winding machine. The experimental results are in good agreement with simulations.
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