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Identification of Near Fault Pulse Shaped Signals With Machine Learning Algorithms

posted Mar 29, 2019, 1:58 AM by Eric Medvet   [ updated Mar 29, 2019, 1:58 AM ]

Near fault ground motions may contain impulse behavior on velocity records. Ground motions with impulse behavior are of particular interest to structural earthquake engineers because they have the potential to impose extreme seismic demands on structures. Various methods have been created for identifying the pulse-shape signals. Previous studies used mathematical constrains, wavelet transformations, cross correlation and several other methods to identify the pulse-shape signals. These studies have diverse results depending on the methods that they have applied on the data.
In this study, we used machine learning algorithms to create a new pulse identification method by using the velocity waveforms. Our database contains waveforms recorded by near fault seismic stations with an epicentral distance less than 150 km. More than 150 crustal earthquakes with Mw ≥ 5.5 are used. 18047 earthquake signal are analyzed in the study. In the first stage, similarities and differences of the previous studies are found. Identifying a signal as a pulse-shape or non pulse-shape varies between the algorithms since previous methods used different mathematical approaches. However, labeling the impulsive signals by hand can give the ground truth. In order to accomplish that we analyzed the database visually. If the signal has impulsive features, starting and ending points of the impulsive part has been labelled. We used manual labels when there is a dispute among previous studies. Then we created a generalized model by using a machine learning algorithm. Our model can detect the impulsive signals with a high precision.

Using machine learning tools to predict prostate cancer upgrading after robotic radical prostatectomy

posted Mar 21, 2019, 1:44 AM by Eric Medvet   [ updated May 13, 2019, 5:13 AM ]

Several nomograms have been developed to predict prostate cancer upgrading however very little artificial intelligence (AI) tools are available for this purpose. Aim of our study was to test the feasibility of AI to predict upgrading in patients with PCa undergoing robotic radical prostatectomy.

Citation Counts and Evaluation of Researchers in the Internet Age

posted Aug 12, 2013, 7:15 AM by Eric Medvet   [ updated Aug 12, 2013, 7:16 AM ]

Bibliometric measures derived from citation counts are increasingly being used as a research evaluation tool. Their strengths and weaknesses have been widely analyzed in the literature and are often subject of vigorous debate. We believe there are a few fundamental issues related to the impact of the web that are not taken into account with the importance they deserve. We focus on evaluation of researchers, but several of our arguments may be applied also to evaluation of research institutions as well as of journals and conferences.

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