Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Carmen Grigoras"'
Publikováno v:
Balneo and PRM Research Journal, Vol 15, Iss 1, p 665 (2024)
Background: Heart rate variability (HRV) is a parameter useful in monitoring post stroke cardiac dysautonomia. Our study is aimed at investigating HRV modifications in patients with stroke; (2) Methods: We investigated HRV parameters in 35 men and 35
Externí odkaz:
https://doaj.org/article/b14596ee5e0e4336b1ac2ecbdee3b895
Publikováno v:
Acta Neurologica Belgica. 123:129-137
Hypertension is considered a risk factor for stroke and dementia. Ambulatory blood pressure monitoring (ABPM) is a useful tool in the diagnosis and treatment of hypertension. This study aimed to evaluate blood pressure using ABPM, in 30 Alzheimer’s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aab9171b7f7309d490b5bec200ee445b
https://doi.org/10.1007/s13760-021-01664-8
https://doi.org/10.1007/s13760-021-01664-8
Publikováno v:
Acta neurologica Belgica.
Hypertension is considered a risk factor for stroke and dementia. Ambulatory blood pressure monitoring (ABPM) is a useful tool in the diagnosis and treatment of hypertension. This study aimed to evaluate blood pressure using ABPM, in 30 Alzheimer's d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::70e486408a58a4958bcb9c27dc533d97
https://pubmed.ncbi.nlm.nih.gov/34043211
https://pubmed.ncbi.nlm.nih.gov/34043211
Autor:
Victor Grigoras, Carmen Grigoras
Publikováno v:
2019 International Symposium on Signals, Circuits and Systems (ISSCS).
Nonlinear autonomous systems are used as generators, being capable of performing periodic, quasi-periodic or chaotic dynamical behaviors. The present contribution develops an analogue structure built around an algebraic additive nonlinear function. A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fd501ac6166eb6daf7f2c74767444adc
https://doi.org/10.1109/isscs.2019.8801809
https://doi.org/10.1109/isscs.2019.8801809
Autor:
Carmen Grigoras, Victor Grigoras
Publikováno v:
2018 10th International Conference on Electronics, Computers and Artificial Intelligence (ECAI).
The present contribution aims at comparing the behavior of discrete-time chaotic generators, used in encryption and other communication security structures of biomedical signals. The two types of analyzed systems are a digital filter with nonlinear b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4f8513d6a15add69395e6b1458740f16
https://doi.org/10.1109/ecai.2018.8678936
https://doi.org/10.1109/ecai.2018.8678936
Autor:
Carmen Grigoras, Victor Grigoras
Publikováno v:
2017 5th International Symposium on Electrical and Electronics Engineering (ISEEE).
Chaotic modulation is a strong method of improving communication security. Analog and discrete chaotic systems are presented in actual literature. Due to the expanse of digital communication, discrete-time systems become more efficient and closer to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b6266cd66787bbc6012193079e8b3d4e
https://doi.org/10.1109/iseee.2017.8170629
https://doi.org/10.1109/iseee.2017.8170629
Autor:
Carmen Grigoras, Victor Grigoras
Publikováno v:
Advances in Electrical and Computer Engineering, Vol 14, Iss 2, Pp 109-112 (2014)
We introduce a novel third order analogue nonlinear system, using three multipliers as nonlinear functions. The proposed system exhibits rich nonlinear dynamics, with periodic and chaotic behaviors, depending on the system parameters. The strange att
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d255f0b98164dfbf15ea7fb4bb50d8ec
https://doaj.org/article/68f3a3fd2f9848a092313882ea6137fe
https://doaj.org/article/68f3a3fd2f9848a092313882ea6137fe
Autor:
Victor Grigoras, Carmen Grigoras
Publikováno v:
2015 International Symposium on Signals, Circuits and Systems (ISSCS).
We introduce a new analog nonlinear system exhibiting chaotic dynamics, aiming at analog noise and spread spectrum clock generation. The proposed system is based on a signum type nonlinear function, with discontinuity in the origin, implemented using
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ed1a1bd8da07adc76357577e8a0661c8
https://doi.org/10.1109/isscs.2015.7204024
https://doi.org/10.1109/isscs.2015.7204024
Autor:
Carmen Grigoras, Victor Grigoras
Publikováno v:
ISSCS 2011 - International Symposium on Signals, Circuits and Systems.
Using chaotic circuits to noise generation is a straightforward application, due to the properties of sensitivity, unpredictability and topological transitivity, that such systems exhibit. The present contribution gives simulation results regarding s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::13f9398647ef63864533c8f4ec21d195
https://doi.org/10.1109/isscs.2011.5978662
https://doi.org/10.1109/isscs.2011.5978662
Autor:
Victor Grigoras, Carmen Grigoras
Publikováno v:
Chaos Theory.
Chaos synchronization was extensively studied the last two decades leading to several synchronization and modulation methods. The main aim of the research was to develop wide bandwidth, spread spectrum like and secure communication systems. Taking in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b33afe258df86155afc54d1a969d811
https://doi.org/10.1142/9789814350341_0020
https://doi.org/10.1142/9789814350341_0020