Сринивасан Сабаратинам
Факультет компьютерных наук
Должности
- Доцент — Факультет компьютерных наук, Департамент анализа данных и искусственного интеллекта
- Старший научный сотрудник — Факультет компьютерных наук, Научно-учебная лаборатория моделирования и управления сложными системами
Био
- · Начал работать в НИУ ВШЭ в 2021 году.
Образование
- 2016 · PhD
- 2010 · Магистратура: Университет Бхаратидасан, специальность «Физика», квалификация «Магистр наук»
Опыт работы
- · 2021-2024: : Постдок: Лаборатория моделирования и управления сложными системами, Национальный исследовательский университет (ВШЭ), Москва, Россия. Личная страница
- · 2019-2021: : Постдок: Группа BSICoS, I3A, Арагонский институт инженерных исследований, Университет Сарагосы, Испания
- · 2017-2019: : Постдок/руководитель проекта: Кафедра физики и астрофизики, Делийский университет, Нью-Дели, Индия
- · 2017-2018: : Технический ассистент и преподаватель: Преподавание программирования на языке 'C' для магистрантов в компьютерной лаборатории, кафедра физики и астрофизики, Делийский университет, Нью-Дели -110007. Эта возможность была предоставлена в рамках программы NPDF
- · 2016-2017: : Доцент кафедры физики: Преподавал инженерную физику и материаловедение на факультете науки и гуманитарных наук, Академия высшего образования Карпагам, Университет Карпагам, г. Коимбатур, Тамилнад, Индия (18.01.2017 - 30.04.2017)
- · 2013-2016: : Технический ассистент и преподаватель: Поддержка магистрантов в Школе физики, Университет Бхаратхидасан, в рамках программы UGC-BSR. Исследовательская стипендия в области науки для выдающихся студентов в форме старшего научного сотрудника/младшего научного сотрудника (29.03.2013 - 28.11.2016)
Идентификаторы исследователя
- ORCID:
0000-0003-2445-4800 - ResearcherID:
AAY-1493-2020 - Google Scholar: https://scholar.google.com/citations?user=ANWFuZIAAAAJ&hl=en
Публикации (27)
Study on bifurcation analysis and Takagi–Sugeno fuzzy sampled-data stabilization of permanent magnet synchronous motor systems
2021 · ARTICLE · en
The bifurcation, stability and stabilization analysis of permanent magnet synchronous motor (PMSM) systems are investigated in this paper. To begin, a new class of delay-dependent sufficient conditions is suggested with respect to the information of the membership function, a relevant Lyapunov-Krasovskii functional (LKF), and the overall information connected with the real sampling pattern, so that the fuzzy system is ensured to be stable with a weighted dissipativity efficiency. Second, sampled-data control is intended to stabilize the Takagi-Sugeno (T-S) fuzzy system with specified integral inequalities based on the obtained results. The required conditions are stated in terms of the feasibility of linear matrix inequalities (LMIs) under the dissipativity output index, and can readily be verified by MATLAB toolbox. Finally, verification examples are contributed to demonstrated the efficacy of the techniques established in this paper.
Chronological and biological aging of the human left ventricular myocardium: Analysis of microRNAs contribution
2021 · ARTICLE · en
Aging is the main risk factor for cardiovascular diseases. In humans, cardiac aging remains poorly characterized. Most studies are based on chronological age (CA) and disregard biological age (BA), the actual physiological age (result of the aging rate on the organ structure and function), thus yielding potentially imperfect outcomes. Deciphering the molecular basis of ventricular aging, especially by BA, could lead to major progresses in cardiac research. We aim to describe the transcriptome dynamics of the aging left ventricle (LV) in humans according to both CA and BA and characterize the contribution of microRNAs, key transcriptional regulators. BA is measured using two CA-associated transcriptional markers: CDKN2A expression, a cell senescence marker, and apparent age (AppAge), a highly complex transcriptional index. Bioinformatics analysis of 132 LV samples shows that CDKN2A expression and AppAge represent transcriptomic changes better than CA. Both BA markers are biologically validated in relation to an aging phenotype associated with heart dysfunction, the amount of cardiac fibrosis. BA-based analyses uncover depleted cardiac-specific processes, among other relevant functions, that are undetected by CA. Twenty BA-related microRNAs are identified, and two of them highly heart-enriched that are present in plasma. We describe a microRNA-gene regulatory network related to cardiac processes that are partially validated in vitro and in LV samples from living donors. We prove the higher sensitivity of BA over CA to explain transcriptomic changes in the aging myocardium and report novel molecular insights into human LV biological aging. Our results can find application in future therapeutic and biomarker research.
Extreme events in a forced BVP oscillator: Experimental and numerical studies
2021 · ARTICLE · en
In this work, we report the existence of extreme events in the well known Bonhoeffer-van der Pol (BVP) oscillator under the excitation of a periodically forced voltage. Extreme events refer to the sudden and random increase in the amplitude of one or more of the state variables of the dynamical system and arise because of the incidence of interior crises or the presence of discontinuous boundaries or intermittency. We have chosen this system because of the fact that it has spawned several systems modelling neuronal dynamics such as Hindmarsh-Rose (HR) and Hodgkin-Huxley (HH) models. Our investigations involve both laboratory experiments and numerical simulations. We have obtained time plots, phase portraits, Poincaré maps, bifurcation graphs, Lyapunov exponents and signal to noise ratio (SNR) to study the general dynamics and to confirm the presence of extreme events, we have used statistical measures such as phase slip analysis, distribution functions for both experimental and numerical data. To the best of our knowledge, we believe that it is for the first time that the occurrence of extreme event has been reported using both real time experimental and numerical studies on this forced BVP system.
Analysis of T Wave Nonlinear Dynamics for Serum Potassium Monitoring in End-Stage Renal Disease Patients
2020 · ARTICLE · en
Non-invasive estimation of serum potassium, [K+], is of major importance to prevent associated risks, but current ambulatory estimation methods are limited. We investigated changes in T wave nonlinear dynamics by quantifying a divergence-related marker ψ on electrocardiograms (ECGs) from 15 end-stage renal disease (ESRD) patients undergoing hemodialysis (HD) and we assessed the relationship between ψ and [K+]. ECGs from 22 simulated transmural ventricular fibers were additionally calculated. In ESRD patients, ψ took the largest values at the beginning and end of the HD session, corresponding to the highest and lowest [K+] values. The median correlation coefficient over patients between the change in ψ and the change in [K+] was 0.92 and decreased to 0.74 after controlling for the effects of [Ca2+] and heart rate. These associations were, however, highly patient-dependent. Both the strength and variability of the ψ-[K+] relationship was reproduced in the simulations, with the variability explained by differences in transmural heterogeneities: 10% variations in the proportion of epicardial and midmyocardial cells led to more than 10% and 8% changes in ψ, respectively. In conclusion, changes in the nonlinear dynamics of the ECG T waves can be related to [K+] variations in ESRD patients, despite the high inter-individual variability
The transition of pull in-instability through extreme event in a MEMS resonators
2019 · ARTICLE · en
Microelectromechanical system (MEMS) oscillators are timing devices that generate highly stable frequencies. The stability of the MEMS resonator is widely studied in recent years for avoiding such pull in-instability event. In this letter, we found the MEMS resonator approach the pull in-instability via the emerging extreme event (EE) phenomenon. We analyze the EE with many statistical and numerical measures. The importance of the present work also discussed in this present study.
Generalized synchronization in a conservative and nearly conservative systems of star network
2018 · ARTICLE · en
We report the coexistence of synchronized and unsynchronized states in a mutually coupled star network of nearly conservative non-identical oscillators. Generalized synchronization is observed between the central oscillator with the peripherals, and phase synchronization is found among the peripherals in weakly dissipative systems. However, the basin size of the synchronization region decreases as dissipation strength is increased. We have demonstrated these phenomena with the help of Duffing and Lorenz84 oscillators with conservative, nearly conservative, and dissipative properties.
Memristor emulator causes dissimilarity on a coupled memristive systems
2018 · ARTICLE · en
The memristor is known as abasic fourth passive solid state circuit element. Itgaining increasing attention to create the next generation electronic devices commonly used as fundamental chaotic circuit although often arbitrary (typically piecewise linear or cubic) fluxcharge characteristics. In thispresent work, the causes of the memristor emulator studied in a coupled memristive chaoticoscillator for the first time. We confirm that the emulator that allows synchronization between theoscillators and cause the dissimilarity between the systems when increasing the couplingstrength, and co-efficient of the memristor emulator. The detailed statistical analysis was performed to confirm such phenomenon.
Курсы (1)
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Modern Concepts of Dynamical Neural Networks · 2 раза
2025/2026, 2024/2025 · Магистратура / Магистратура направление: 01.04.02 Прикладная математика и информатика / Маго-лего · Анг