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Orthonormal-Basis Partitioning and Time-Frequency Representation of Cardiac Rhythm Dynamics

Autor: Vladimir Shusterman, Benhur Aysin, Luis F. Chaparro, Ilan Grave

Publikováno v: IEEE Transactions on Biomedical Engineering. 52:878-889

Although a number of time-frequency representations have been proposed for the estimation of time-dependent spectra, the time-frequency analysis of multicomponent physiological signals, such as beat-to-beat variations of cardiac rhythm or heart rate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ec535935c30ccfb9c2620bc93ed5854
https://doi.org/10.1109/tbme.2005.845228

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Switching and control of electric field configurations along multi-quantum well structures

Autor: Ilan Grave, Sangwoo An

Publikováno v: Pure and Applied Optics: Journal of the European Optical Society Part A. 7:409-419

The phenomenon of high-field domain formation and expansion along a superlattice/multi-quantum well system has been known since the first pioneering works on these structures. Experimentally it has usually been observed by monitoring negative differe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::dbe0cc0b31ecb8ba1be684e4bb2b252d
https://doi.org/10.1088/0963-9659/7/2/030

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Structural and dynamic analysis of an ultra short intracavity directional coupler

Autor: Gadi Golan, Ilan Grave, Giora Griffel, Youssef Daou

Publikováno v: Pure and Applied Optics: Journal of the European Optical Society Part A. 6:61-66

A recently proposed intracavity directional coupler is analysed. Exact analytic expressions for important parameters such as the transmission ratio, the coupling length, and the photon lifetime are given. We show that by controlling the mirror reflec

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f69bc6daa87283b4f579aa58b356b02f
https://doi.org/10.1088/0963-9659/6/1/008

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Denoising of non-stationary signals using optimized Karhunen-Loeve expansion

Autor: Benhur Aysin, Luis F. Chaparro, Ilan Grave, Vladimir Shusterman

Publikováno v: Scopus-Elsevier

We show that denoising a non-stationary signal is possible by means of a Karhunen-Loeve (KL) expansion optimized by an entropy criterion. This criterion is used to segment the noisy signal and to choose the most parsimonious KL representation possibl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9dcd2dadc4e593adedf3e63a9c66e338
https://doi.org/10.1109/tfsa.1998.721501

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Detection of transients in heart rate variability signals using a time-varying varying Karhunen-Loeve expansion

Autor: Benhur Aysin, Vladimir Shusterman, Ilan Grave, Luis F. Chaparro

Publikováno v: ICASSP

We present a method to capture transient changes in heart-rate variability (HRV) signals. To deal with the nonstationarities in these signals we propose a time-dependent Karhunen-Loeve expansion. Using this expansion together with an entropy criterio

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::61dc1a9b01ce28dac21ad2a4cce39ede
https://doi.org/10.1109/icassp.2000.860177

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Low-voltage Q switching of diode-pumped Er:Yb:glass laser by a BBO Pockels cell

Autor: Ilan Grave, Alain M. Chardon, Joel Falk

Publikováno v: SPIE Proceedings.

Seeded Q-switched pulsing in a diode-pumped Er-Yb glass laser has been experimentally demonstrated. The Q-switch is a beta-barium borate Pockels cell. The voltage applied to the BBO is much lower than the voltage needed to hold off the laser. This al

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::09a7f2bbc1e131890591f2300f367a46
https://doi.org/10.1117/12.373639

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