The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Class imbalance is prevalent in many real world datasets. It occurs when there are significantly fewer examples in one or more classes in a dataset compared to the number of instances in the remaining classes. When trained on highly imbalanced datasets, traditional machine learning techniques can often simply ignore the minority class(es) and label all instances as being of the majority class to maximize...
Data fusion is the process of combining data from multiple sources, allowing for a more complete and accurate assessment of a system or an environment than could have been otherwise provided by a single source. This paper considers and empirically evaluates a decision-level data fusion method for enabling reliable ocean turbine state detection based on data from multiple sensors. This method involves...
An ocean turbine extracts the kinetic energy from ocean currents to generate electricity. Vibration signals from the turbine hold a wealth of information regarding its state, and detecting changes in these signals is crucial to the timely detection of faults. Wavelet transforms provide a means of analyzing these complex signals and extracting features which are representative of the signal. Feature...
Vibration signals are an important source of information for machine condition monitoring/prognostic health monitoring to ensure the reliability of ocean systems. Because they are waveforms, vibration data must be transformed into the frequency domain before they can be used to build classification and prediction models. One popular transformation is wavelet packet decomposition, a higher resolution...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.