Sverstiuk A. Models and methods of compartmental mathematical modelling of cyber-physical systems of medical and biological processes

The dissertation is devoted to the solution of the problem of development of mathematical modelling and computational methods in the direction of creation and investigation of new compartmental mathematical models of cyber-physical systems of medical and biological processes. A methodology for designing cyber-physical biosensor systems used for automated monitoring of biomedical processes has been developed. On the basis of the suggested methodology, compartmental mathematical models of cyber-physical systems of medical and biological processes have been developed using lattice differential and difference equations with delay on rectangular and hexagonal lattices. The developed compartmental mathematical models take into account all the properties that are characteristic of lattice cyber-physical systems of medical and biological processes. Taking into account the lattice structure, the research has been carried out by the use of appropriate interactions between pixels of rectangular and hexagonal lattices, spatial operators and coordinations of biopixels. Methods of computational mathematics have been developed for solving problems of studying the permanence, extinction and stability of compartmental mathematical models of cyber-physical systems of medical and biological processes by using lattice differential and difference equations with delay on rectangular and hexagonal lattices. The basic numbers of reproduction have been suggested as a tool for studying the stability of compartmental lattice-type mathematical models. The conditions of stability, stability state without antibodies, stability state without antigens and antibodies, identical and non-identical endemic stability state have been investigated. Тhe study of local and global asymptotic stability has presented qualitative and quantitative results of numerical simulation of cyber-physical systems of medical and biological processes. The numerical simulation results show that the time delay has the greatest influence on the stability of the developed mathematical models of cyber-physical biosensor systems on rectangular and hexagonal lattices using lattice differential and difference equations with delay. New methods of organizing and optimizing the processes of simulation of cyber-physical biosensor systems using hybrid programming and interpretation of simulation results in the form of phase planes, lattice portraits have been developed. A mathematical model of dynamic logic for the systems under study has been developed by using the basic terms of the hybrid programming language. The results of numerical simulation of the developed cyber-physical biosensor system have been presented in the form of electrical signals from transducers characterizing the number of fluorescent pixels. Methods of computational mathematics have been worked out to solve the problems of exponential stability research of recurrent neural network models for cyber-physical systems of medical and biological processes. The algorithm of optimal control in the model of cyber-physical system of laboratory diagnostics based on polymerase-chain reaction has been developed. Using the obtained results, it is possible to control the temperature to minimize the required time of implementation of the annealing stage with the possibility of using a minimum amount of primer. The practical significance of the results of the dissertation research consists in the fact that, on the basis of the developed compartmental mathematical models of cyber-physical systems of medical and biological processes, the study of stability on rectangular and hexagonal lattices with the use of lattice differential and difference equations, it has been established that the constant delay is the most important parameter that affects the stability of the systems under study. A software complex has been developed to study the stability of cyber-physical systems of medical-biological processes, consisting of a block of identification and input of the parameters of the studied models, a software module for investigation of continuous dynamics, the block of modelling of the lattice images of antigens and antibodies, the block of obtaining the lattice images of connections of antigens with antibodies, the module of the study of discrete dynamics on the stability of the cyber-physical biosensor system and the visualization unit. The developed software complex and the obtained practical results are suitable for use in the design of modern cyber-physical systems of medical and biological processes with ensuring their stability during storage and use.