4 research outputs found
Observer-Based State Feedback for Enhanced Insulin Control of Type âIâ Diabetic Patients
During the past few decades, biomedical modeling techniques have been applied to improve performance of a wide variety of medical systems that require monitoring and control. Diabetes is one of the most important medical problems. This paper focuses on designing a state feedback controller with observer to improve the performance of the insulin control for type âIâ diabetic patients. The dynamic model of glucose levels in diabetic patients is a nonlinear model. The system is a typical fourth-order single-input-single-output state space model. Using a linear time invariant controller based on an operating condition is a common method to simplify control design. On the other hand, adaptive control can potentially improve system performance. But it increases control complexity and may create further stability issues. This paper investigates patient models and presents a simplified control scheme using observer-based feedback controllers. By comparing different control schemes, it shows that a properly designed state feedback controller with observer can eliminate the adaptation strategy that the Proportional-Integral-Derivative (PID) controllers need to improve the control performance. Control strategies are simulated and their performance is evaluated in MATLAB and Simulink
Acoustical structured illumination for super-resolution ultrasound imaging
Tali Ilovitsh et al. describe a new method, acoustical structured illumination, for generating super-resolution ultrasound images. The method applies principles from structured illumination microscopy and can be adapted to existing ultrasound systems without the need for additional components