Browsing by Author "Olmedo Hidalgo, Juan Carlos"
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- ItemA fuzzy logic based model computes cardiac output from the radial arterial pressure waveform(IEEE, 1994) Urzua Urzua, Jorge; Guarini Hermann, Marcelo Walter; Cipriano, Aldo; Matus Acuña, Marcelo Enrique; Lee, J.; Salinas, C.; Olmedo Hidalgo, Juan Carlos; Lema F., Guillermo; Canessa, RobertoAn interactive scheme for the development of a fuzzy logic based model has been implemented and applied to build a model that is able to determine cardiac output from radial arterial pressure. It was built using as input radial pressure waveforms from patients in whom cardiac output was simultaneously measured by thermodilution. The scheme was programmed in C language in an Apollo workstation under Unix. Input variables were area under the curve, ratio between systolic and diastolic pressure, and pulse frequency. To determine fuzzy sets and membership functions the authors used 149 pressure waveforms. To test the model, the authors used 6 waveforms not used in building the model. Correlation between predicted cardiac output with measured flow was 0.98.<>
- ItemA sensor for assessing the quality of the mineral flotation process(IEEE, 1994) Guarini Hermann, Marcelo Walter; Caceres, J.; Guesalaga Meissner, Andrés Rodrigo; Cipriano, Aldo; Olmedo Hidalgo, Juan Carlos; Lozano Segura, Hector AndresAn instrument to assess the quality of the flotation process for mineral concentration in the copper industry has been developed. It is based on computer processing of images of the foam formed at the surface of flotation cells, that are captured by a CCD camera. The instrument evaluates the size, shape and color parameters of the foam bubbles, which, according to experienced plant operators, are associated with the quality of the flotation process. It is being used for supporting plant operator control decisions, and to correlate the calculated parameters with the performance of the flotation process. In future applications, it can be used as a sensor for a fuzzy logic or neural net based control system.<>