Browsing by Author "McKenna, Thomas"
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- ItemA method for automatic identification of reliable heart rates calculated from ECG and PPG waveforms.(2006-05-03) Yu, Chenggang; Liu, Zhenqiu; McKenna, Thomas; Reisner, Andrew T; Reifman, JaquesThe development and application of data driven decision support systems for medical triage diagnostics and prognostics pose special requirements on physiologic data In particular that data are reliable in order to produce meaningful results The authors describe a method that automatically estimates the reliability of reference heart rates HRr derived from electrocardiogram ECG waveforms and photoplethysmogram PPG waveforms recorded by vital signs monitors The reliability is quantitatively expressed through a quality index QI for each HRr
- ItemRegularization of body core temperature prediction during physical activity.(2007-10-23) Gribok, Andrei; McKenna, Thomas; Reifman, JacquesThis paper deals with the prediction of body core temperature during physical activity in different environmental conditions using first principles models and data driven models We argue that prediction of physiological variables through other correlated physiological variables using data driven techniques is an ill posed problem To make predictions produced by data driven models accurate and stable they need to be regularized We demonstrate on data collected during laboratory study that data driven models if regularized properly can outperform first principles models in terms of accuracy of core temperature predictions We also show that data driven models can be made portable from one subject to another thus making them a valuable practical tool when data from only one subject is available to train the model