Buscar
Mostrando ítems 11-20 de 3488
Functional differences of low- and high-frequency oscillatory dynamics during illusory border perception
(ELSEVIER, 2010)
Neuronal oscillations are an essential part of several brain processes like perception, memory and attention, but little is known about the simultaneous dynamics of different frequency bands in such processes. Here, we ...
Comparison of Frequency Bands Using Spectral Entropy for Epileptic Seizure Prediction
(Hindawi Publishing Corporation, 2013-05)
Under the hypothesis that the uncontrolled neuronal synchronization propagates recruiting more and more neurons, the aim is to detect its onset as early as possible by signal analysis. This synchronization is not noticeable ...
Design of miniaturized frequency selective surfaces using minkowski island fractal
(SBMO/SBMag, 2010-08-01)
A Cognitive Way to Access the Frequency Spectrum
(2013-07-05)
Cognitive radio (CR) is an emergent technology in wireless communication. It aims at improve considerably spectrum use by allowing dynamic spectrum access (DSA). The DSA can be performed in different ways, e.g. interweave ...
On confidence bands for time series problems in the time and frequency domains
(Institute of Mathematical Statistics, 2003-12)
The construction of (asymptotic) simultaneous confidence bands for some time series problems is studied, typically for the sample autocorrelogram and windowed spectral density estimate. The following approaches are explored: ...
Modeling the frequency dispersion phenomena in GaN and GaAs devices for broadband data communication
(Institute of Electrical and Electronics Engineers Inc., 2014)
A novel technique for modeling GaN and GaAs transistors for data communications is proposed. The technique can model one of the most critical phenomena in wideband communications, called frequency dispersion effects. Results ...
Microcalcification enhancement and classification on mammograms using the wavelet transform
(2008-11-24)
This paper presents a method to enhance microcalcifications and classify their borders by applying the wavelet transform. Decomposing an image and removing its low frequency sub-band the microcalcifications are enhanced. ...
Connective frequency bands informed by textbook frequencies and midadolescents’ knowledge of connectives: a tool to support Spanish literacy instruction across content areas
(2023)
This study focuses on connectives, linguistic devices that signal relations between ideas. Connective knowledge varies widely across grades and is known to support reading comprehension and school writing. Despite the ...