Sergey Simakov
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View article: Thigh muscle pump function during ambulation
Thigh muscle pump function during ambulation Open
This report addresses the mechanical aspects of the thigh muscle pump during human locomotion, specifically treadmill walking. The study establishes a correlation between the stride cycle and venous pressure changes within the thigh interm…
View article: Evaluation of Student's Posture Using Motion Video Analysis, Extraction of Anatomical Point Parameters, and Critical Duration of Postures
Evaluation of Student's Posture Using Motion Video Analysis, Extraction of Anatomical Point Parameters, and Critical Duration of Postures Open
This article discusses the development and implementation of an algorithm for the automatic analysis of schoolchildren's posture using video recordings. The study aims to create an effective tool for detecting posture deviations through bi…
View article: The human lower leg muscle pump functions as a flow diverter pump, maintaining low ambulatory venous pressures during locomotion
The human lower leg muscle pump functions as a flow diverter pump, maintaining low ambulatory venous pressures during locomotion Open
During natural locomotion, the muscle pump acts as a flow diverter pump, redirecting the flow of blood from the superficial veins to the intramuscular veins via the perforating veins. During ambulation, the pressure in the superficial veno…
View article: Computational Analysis of Hemodynamic Indices in Multivessel Coronary Artery Disease in the Presence of Myocardial Perfusion Dysfunction
Computational Analysis of Hemodynamic Indices in Multivessel Coronary Artery Disease in the Presence of Myocardial Perfusion Dysfunction Open
Coronary artery disease (CAD) is one of the main causes of death in the world. Functional indices such as fractional flow reserve (FFR), coronary flow reserve (CFR) and instantaneous wave-free ratio (iFR) are used to estimate the severity …
View article: Dual-Pass Feature-Fused SSD Model for Detecting Multi-Scale Vehicles on the Construction Site
Dual-Pass Feature-Fused SSD Model for Detecting Multi-Scale Vehicles on the Construction Site Open
When detecting equipment on a construction site the objects of detection could have very different scale relative to the image on which they are located. For better detection and bounding box visualization of small objects, a Feature-Fused…
View article: Physically Informed Deep Learning Technique for Estimating Blood Flow Parameters in Four-Vessel Junction after the Fontan Procedure
Physically Informed Deep Learning Technique for Estimating Blood Flow Parameters in Four-Vessel Junction after the Fontan Procedure Open
This study introduces an innovative approach leveraging physics-informed neural networks (PINNs) for the efficient computation of blood flows at the boundaries of a four-vessel junction formed by a Fontan procedure. The methodology incorpo…
View article: Control of sports exercises and diagnostics of diseases of the musculoskeletal system using hardware and software complex and machine learning algorithm
Control of sports exercises and diagnostics of diseases of the musculoskeletal system using hardware and software complex and machine learning algorithm Open
The article presents the experience of developing a hardware and software complex designed to monitor the performance of sports exercises and diagnose the state of the athlete’s musculoskeletal system. The algorithms used are described and…
View article: Evaluation of the Prompt Gamma-ray Spectrum from Spontaneous Fission of 252Cf
Evaluation of the Prompt Gamma-ray Spectrum from Spontaneous Fission of 252Cf Open
The energy spectra, multiplicities and average energies of the prompt, total and delayed γ-rays accompanying the spontaneous fission of 252Cf were collected from the literature and dedicated databases. They were carefully analysed for cons…
View article: Human lower leg muscle pump acts like a stream diversion pump during locomotion
Human lower leg muscle pump acts like a stream diversion pump during locomotion Open
Background Calf muscle pump (CMP) failure is associated with the development and progression of chronic venous insufficiency as characterized by ambulatory venous hypertension (AVH). However, the explicit interconnection between AVH with C…
View article: The Influence of Aortic Valve Disease on Coronary Hemodynamics: A Computational Model-Based Study
The Influence of Aortic Valve Disease on Coronary Hemodynamics: A Computational Model-Based Study Open
Aortic valve disease (AVD) often coexists with coronary artery disease (CAD), but whether and how the two diseases are correlated remains poorly understood. In this study, a zero–three dimensional (0-3D) multi-scale modeling method was dev…
View article: A numerical study of the hemodynamic behavior and gas transport in cardiovascular systems with severe cardiac or cardiopulmonary failure supported by venoarterial extracorporeal membrane oxygenation
A numerical study of the hemodynamic behavior and gas transport in cardiovascular systems with severe cardiac or cardiopulmonary failure supported by venoarterial extracorporeal membrane oxygenation Open
Venoarterial extracorporeal membrane oxygenation (VA-ECMO) has been extensively demonstrated as an effective means of bridge-to-destination in the treatment of patients with severe ventricular failure or cardiopulmonary failure. However, a…
View article: Computational Analysis of Hemodynamic Indices Based on Personalized Identification of Aortic Pulse Wave Velocity by a Neural Network
Computational Analysis of Hemodynamic Indices Based on Personalized Identification of Aortic Pulse Wave Velocity by a Neural Network Open
Adequate personalized numerical simulation of hemodynamic indices in coronary arteries requires accurate identification of the key parameters. Elastic properties of coronary vessels produce a significant effect on the accuracy of simulatio…
View article: Progress in the Evaluation and Validation of n+<sup>56,57</sup>Fe Cross Sections
Progress in the Evaluation and Validation of n+<sup>56,57</sup>Fe Cross Sections Open
There has been a continued effort since 2019 within the IAEA INDEN collaboration to improve the evaluation of neutron induced reactions on iron isotopes. The reason for the 30% underestimation of the neutron leakage spectrum from a thick i…
View article: Orphan optical flare as SOSS emission afterglow, localization in time
Orphan optical flare as SOSS emission afterglow, localization in time Open
We report on MASTER optical observations of an afterglow-like optical and X-ray transient AT2021lfa/ZTF21aayokph. We detected the initial steady brightening of the transient at 7σ confidence level. This allowed us to use smooth optical sel…
View article: Computational Analysis of Haemodynamic Indices in Synthetic Atherosclerotic Coronary Netwroks
Computational Analysis of Haemodynamic Indices in Synthetic Atherosclerotic Coronary Netwroks Open
Haemodynamic indices are widely used in clinical practice when deciding on a particular type of treatment. Low quality of the computed tomography data and tachycardia complicate interpretation of the measured or simulated values. In this w…
View article: Impact of Arrhythmia on Myocardial Perfusion: A Computational Model-Based Study
Impact of Arrhythmia on Myocardial Perfusion: A Computational Model-Based Study Open
(1) Background: Arrhythmia, which is an umbrella term for various types of abnormal rhythms of heartbeat, has a high prevalence in both the general population and patients with coronary artery disease. So far, it remains unclear how differ…
View article: Computational Analysis of Haemodynamic Indices in Synthetic Atherosclerotic Coronary Netwroks
Computational Analysis of Haemodynamic Indices in Synthetic Atherosclerotic Coronary Netwroks Open
Haemodynamic indices are widely used in clinical practice for deciding on a particular type of treatment. Low quality of the CT data and tachycardia complicate interpretation of the measured or simulated values. In this work, we present a …
View article: Noninvasive Assessment of the Fractional Flow Reserve with the CT FFRc 1D Method: Final Results of a Pilot Study
Noninvasive Assessment of the Fractional Flow Reserve with the CT FFRc 1D Method: Final Results of a Pilot Study Open
The obtained indices of sensitivity, specificity, PPV, and NPV are, in general, comparable to those in other studies. Moreover, the noninvasive values of FFR yielded a high correlation coefficient with the invasive values. However, the AUC…
View article: HPRL – International cooperation to identify and monitor priority nuclear data needs for nuclear applications
HPRL – International cooperation to identify and monitor priority nuclear data needs for nuclear applications Open
The OECD-NEA High Priority Request List (HPRL) is a point of reference to guide and stimulate the improvement of nuclear data for nuclear energy and other applications, and a tool to bridge the gap between data users and producers. The HPR…
View article: Analysis of Operating Modes for Left Ventricle Assist Devices via Integrated Models of Blood Circulation
Analysis of Operating Modes for Left Ventricle Assist Devices via Integrated Models of Blood Circulation Open
Left ventricular assist devices provide circulatory support to patients with end-stage heart failure. The standard operating conditions of the pump imply limitations on the rotation speed of the rotor. In this work we validate a model for …
View article: Computational Analysis of Coronary Blood Flow: The Role of Asynchronous Pacing and Arrhythmias
Computational Analysis of Coronary Blood Flow: The Role of Asynchronous Pacing and Arrhythmias Open
In this work we present a one-dimensional (1D) mathematical model of the coronary circulation and use it to study the effects of arrhythmias on coronary blood flow (CBF). Hydrodynamical models are rarely used to study arrhythmias’ effects …
View article: Comparison of Instantaneous Wave-Free Ratio (iFR) and Fractional Flow Reserve (FFR) with respect to Their Sensitivities to Cardiovascular Factors: A Computational Model-Based Study
Comparison of Instantaneous Wave-Free Ratio (iFR) and Fractional Flow Reserve (FFR) with respect to Their Sensitivities to Cardiovascular Factors: A Computational Model-Based Study Open
While coronary revascularization strategies guided by instantaneous wave-free ratio (iFR) are, in general, noninferior to those guided by fractional flow reserve (FFR) with respect to the rate of major adverse cardiac events at one-year fo…
View article: Non-invasive fractional flow reserve: a comparison of one-dimensional and three-dimensional mathematical modeling effectiveness
Non-invasive fractional flow reserve: a comparison of one-dimensional and three-dimensional mathematical modeling effectiveness Open
Aim. Comparative analysis of the diagnostic effectiveness of onedimensional (1-D) and three-dimensional (3-D) non-invasive methods for coronary fractional flow reserve (FFR) assessment based on the coronary computed tomography angiography …
View article: Physical principles of venous hemodynamics and its mathematical modeling
Physical principles of venous hemodynamics and its mathematical modeling Open
In physiological conditions, the cardiovascular system (CVS) is a closed circulatory system comprising a pump (the heart), a conduit system (vasculature), and a continuum media (blood) moving through the system. The heart is a major source…