Unbounded Viscosity Solutions of Hybrid Control Systems

We study a hybrid control system in which both discrete and continuous controls are involved. The discrete controls act on the system at a given set interface. The state of the system is changed discontinuously when the trajectory hits predefined sets, namely, an autonomous jump set $A$ or a controlled jump set $C$ where controller can choose to jump or not. At each jump, trajectory can move to a different Euclidean space. We allow the cost functionals to be unbounded with certain growth and hence the corresponding value function can be unbounded. We characterize the value function as the unique viscosity solution of the associated quasivariational inequality in a suitable function class. We also consider the evolutionary, finite horizon hybrid control problem with similar model and prove that the value function is the unique viscosity solution in the continuous function class while allowing cost functionals as well as the dynamics to be unbounded

Infinite dimensional differential games with hybrid controls

A two-person zero-sum infinite dimensional differential game of infinite duration with discounted payoff involving hybrid controls is studied. The minimizing player is allowed to take continuous, switching and impulse controls whereas the maximizing player is allowed to take continuous and switching controls. By taking strategies in the sense of Elliott--Kalton, we prove the existence of value and characterize it as the unique viscosity solution of the associated system of quasi-variational inequalities

Sadvritta (Conduct, Behaviour and Moral Values): Key to positive health

Health is defined as balance of Physical, Mental, Social and Spiritual wellbeing. Every person can lead a healthy life by following the certain rules and regulations mentioned by the Ayurveda. Dincharya (a daily regimen), Ritucharya (seasonal routine) and Sadvritta (code of Good Conduct for Mental Health and Social Behaviour) are important rules and regulations for prevention of diseases and leading an ideal positive health. These rules are highly effective in reducing the life style disorders. Ayurveda stalwarts like Acharya Charaka prescribed the list of good conduct and behaviour under heading of Sadvritta. Sadvritta gives us detail knowledge about how to live, dos and don’ts for the person. One who follows the code of good conduct for the maintenance of positive health lives for a hundred years without any abnormality. In this article an effort is made to explore the Sadvritta as positive approach towards healthy life in present scenario

Hybrid control systems and viscosity solutions

We investigate a model of hybrid control system in which both discrete and continuous controls are involved. In this general model, discrete controls act on the system at a given set interface. The state of the system is changed discontinuously when the trajectory hits predefined sets, namely, an autonomous jump set A or a controlled jump set C where the controller can choose to jump or not. At each jump, the trajectory can move to a different Euclidean space. We prove the continuity of the associated value function V with respect to the initial point. Using the dynamic programming principle satisfied by V, we derive a quasi-variational inequality satisfied by V in the viscosity sense. We characterize the value function V as the unique viscosity solution of the quasi-variational inequality by the comparison principle method

On Cahn-Hilliard-Navier-Stokes equations with Nonhomogeneous Boundary

The evolution of two isothermal, incompressible, immiscible fluids in a bounded domain is governed by Cahn-Hilliard-Navier-Stokes equations (CHNS System). In this work, we study the well-posedness results for the CHNS system with nonhomogeneous boundary condition for the velocity equation. We obtain the existence of global weak solutions in the two-dimensional bounded domain. We further prove the continuous dependence of the solution on initial conditions and boundary data that will provide the uniqueness of the weak solution. The existence of strong solutions is also established in this work. Furthermore, we show that in the two-dimensional case, each global weak solution converges to a stationary solution