a b s t r a c tUsing the diagnostic results in the ridge regression model, we propose an approximate version of Cook's distance in the lasso regression model since the analytic expression of the lasso estimator is not available. Also, we express the proposed Cook's distance in terms of basic building blocks such as residuals and leverages. We verify that the proposed statistic successfully detects potentially influential observations on estimators of regression coefficients and on the model selection in the lasso regression model. An illustrative example based on a real dataset is given.
An algorithm to allow shoreline movement during numerical experiment on sediment transport, deposition or resuspension for general coastal morphology is proposed here. The bed slope near shoreline, i.e. mean sea level, is influenced by bed material, tidal current, waves, and wave-induced current, but has been reported to remain within a stable range. Its annual variation is not large, either. The algorithm is adjusting the bathymetry, if the largest bed slope within shoreline band exceeds a given bed slope due to continuous erosion at zones below the shoreline. This algorithm automatically describes retreat of shoreline caused by erosion, when used within a numerical system. The algorithm was tested to a situation which includes a continuous dredging at a point, and showed satisfactory development of concentric circle contours. Next, the algorithm was tested to another situation which includes sinking of eroded part of bed plate, and produced satisfactory results, too. Finally, the algorithm was tested to a movable-bed laboratory experimental conditions. The shoreline movement behind detached breakwater was reasonably reproduced with this algorithm.
Novel blood pressure (BP) monitoring device focused on portability was studied preliminarily. Electrocardiogram (ECG) and photoplethysmogram (PPG) was measured and pulse arrival time (PAT) was computed from these signals. Systolic blood pressure (SBP) and diastolic blood pressure (DBP) showed a clear correlation with PAT. BP estimation model was constructed based on this result and verified by means of leave-one-out cross-validation (LOOCV). Estimated SBP, DBP were involved in two standards of means of original data. This device is expected to be useful to the people who want to monitor BP at any time and space.
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