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Your search keyword '"Saunoriene, Loreta"' showing total 26 results
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26 results on '"Saunoriene, Loreta"'

3. Early Diagnosis of Problems Related to the Self-Organization of the Cardiovascular System Based on the Interplay between RR and JT Cardiac Intervals.

Author

Qammar, Naseha Wafa, Ragulskis, Minvydas, Saunoriene, Loreta, Smidtaite, Rasa, Vainoras, Alfonsas, and Jaruševičius, Gediminas

Subjects
TIME-frequency analysis, CARDIOVASCULAR system, BLOOD pressure, WAVELETS (Mathematics), SAMPLE size (Statistics)
Abstract

The dynamics of the collapse of complexity observable in the performance of the cardiovascular system during the stress test is investigated in this paper. For this purpose, the interplay between the RR and JT cardiac intervals is measured and assessed for each participant. This case study involves a modest sample size of eight individuals with normal and elevated blood pressure. Although it is anticipated that the interaction between the RR and JT intervals is rather complex during the stress test, the existence of interpretable time delays between those cardiac intervals is demonstrated using the time delayed patterns algorithm. The assessment of the cardiovascular mobilization taking place during the stress test is also an integral part of this study. The velocity of adaptation index A d and the newly formulated modified adaptation index A r (computed only for the recovery phase) are used to quantify the healthy mobilization of the cardiovascular system for each participant. The time frequency analysis of the difference signal between the RR and JT intervals is used to quantify the collapse of complexity around the load termination point. Finally, a semi-gauge indication tool is constructed to assess the overall goodness of the self-organization of the cardiovascular system during the stress test. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Image hiding in stochastic geometric Moiré gratings

Author

Saunoriene, Loreta, Saunoris, Marius, Ragulskis, Minvydas, and MDPI AG (Basel, Switzerland)

Subjects
stochastic grating, harmonic oscillations, General Mathematics, image hiding, Computer Science (miscellaneous), averaging in time, geometric moiré, Engineering (miscellaneous)
Abstract

An image hiding scheme based on stochastic moiré gratings is proposed, discussed, and illustrated in this paper. The proposed scheme is based on a counter-intuitive optical feature of specially designed stochastic moiré gratings when similar images in the static mode become very different in the time-averaged mode. A soft computing PSO algorithm was used for the construction of stochastic gratings. Complex computational algorithms were required to construct the cover image; however, the decryption process was completely visual. The cover image must oscillate in a predefined direction and at a predefined amplitude (the amplitude of the harmonic oscillation is one of the parameters of the proposed image hiding scheme). Computational experiments were used to demonstrate the efficacy of this optical image hiding scheme based on the stochastic moiré gratings.

Published
2023

11. Order Adaptive Quadrature Rule for Real Time Holography Applications

Author

Ragulskis, Minvydas, Saunoriene, Loreta, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Rangan, C. Pandu, editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Boyanov, Todor, editor, Dimova, Stefka, editor, Georgiev, Krassimir, editor, and Nikolov, Geno, editor

Published
2007
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22. Visual integration of vibrating images in time.

Author

Guangqing Lu, Ragulskis, Minvydas, Saunoriene, Loreta, Petrauskiene, Vilma, and Gelzinis, Arvydas

Subjects
OPTICAL illusions, MOIRE method, RETINA
Abstract

The ability of the human visual system to integrate a rapidly oscillating image in time is investigated in this paper. A secret image is encoded into a stochastic geometric moiré grating. The secret is leaked in the form of a pattern of time-averaged moiré fringes when the cover image is oscillated according to a predetermined law of motion. Special encoding algorithms are designed for an effective real-time implementation of the scheme on a digital computer screen. A series of experiments is performed to determine the minimum frequency of oscillations required for the interpretation of the embedded secret image. [ABSTRACT FROM AUTHOR]

Published
2018
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