The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Coronary arteries are responsible for maintaining blood supply to the heart. When these arteries get blocked due to plaque deposition, the corresponding pathological condition is referred to as coronary artery disease. This disease develops gradually over the years and consequently, the function of the heart deteriorates, leading to a heart attack in many cases. As the symptoms manifest themselves...
A generalized framework for the generation of Periodic Breathing (PB), caused by delay variation, hypocapnia and sleep along with its management with oxygen therapy is presented. For this, a minimal model of respiratory regulation with cardiovascular component and two delays is proposed. This model is linearized and analyzed for stability by the proposed algorithms using Lyapunov–Krasovskii functional...
Cardiovascular circulation system has been modeled as a 6th order nonlinear system. Systemic arteries and veins; pulmonary arteries and veins; left and right ventricular chambers of the heart form the six compartments of the model. Sensitivity analysis has been performed for the model and then nonlinear least square minimization technique has been used to identify the model parameters while considering...
Mathematical modeling approaches for the respiratory system are done on different abstraction=subsystem levels, depending upon the hypothesis and assumptions. Differential equations are used to describe dynamics of such systems. In the literature, various types of models are available. For example, some models describe the regulation of gases, on the other hand, some models link mouth pressure and...
The respiratory system maintains homeostasis of oxygen and carbon dioxide partial pressures inside blood using feedback mechanism. Mathematical modeling of this system helps in understanding the system's properties and performance under different diseased conditions. One such situation addressed here is obstructive sleep apnea. In this condition, periodic breathing pattern is observed. It is characterized...
The electrocardiogram (ECG) signal represents the electrical activity of the heart. The most characteristic wave of the ECG is the QRS complex, which records the polarization phenomenon of the ventricles. The objective of the work is to detect and classify cardiac arrhythmias of patients from the ECG signal. The detection of the QRS complex is gaining momentum and many algorithms have been reported...
Modeling of physiological systems is useful for qualitative and quantitative explanation of the underlying physiological mechanisms. Cardiovascular system has been chosen for the study. The 5th order time varying state space model for the cardiovascular system has been simulated. Considering cardiovascular circulation to be a switched linear time varying system, the stability issues in the same have...
Chemical Regulation of Human Respiratory System is a complex dynamical system. Primary function of this system is to regulate gas concentrations in the Blood. It is modeled by Nonlinear Delay Differential Equations. Several dynamical models for respiratory regulation are available in the literature, which are broadly classified as Comprehensive and Minimal Models. Minimal models are derived from the...
Hypertension may occur to many patients after surgery. Infusion of vasodilator drugs, such as sodium nitroprusside (SNP) can quickly lower the blood pressure in most patients. During infusion of the drug, automatic infusion is found to be more efficient than manual injection. Hence various automatic control methods are studied. Unity feedback control, PID control, internal model control and Dahlin's...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.