ABSTRACT
We demonstrate a low-profile holographic imaging system at millimeter wavelengths based on an aperture composed of frequency-diverse metasurfaces. Utilizing measurements of spatially-diverse field patterns, diffraction-limited images of human-sized subjects are reconstructed. The system is driven by a single microwave source swept over a band of frequencies (17.5-26.5 GHz) and switched between a collection of transmit and receive metasurface panels. High fidelity image reconstruction requires a precise model for each field pattern generated by the aperture, as well as the manner in which the field scatters from objects in the scene. This constraint makes scaling of computational imaging systems inherently challenging for electrically large, coherent apertures. To meet the demanding requirements, we introduce computational methods and calibration approaches that enable rapid and accurate imaging performance.
Subject(s)
Holography , Microwaves , Radiation , Humans , Image Processing, Computer-Assisted , Imaging, Three-DimensionalABSTRACT
Interest in the mathematical modeling of the carbohydrate metabolism regulation system increases in recent years. This is associated with a "closed loop" insulin pump development (it controls an insulin infusion depending on the blood glucose level). To create an algorithm for the automatic control of insulin (and other hormones) infusion using an insulin pump it is necessary to accurately predict glycaemia level. So, the primary objective of mathematical modeling is to predict the blood glucose level changes, caused by the wide range of external factors. This review discusses the main mathematical models of blood glucose level control physiological system (simplified insulin-glucose system). The two major classes of models--empirical and theoretical--are described in detail. The ideal mathematical model of carbohydrate metabolism regulatory system is absent. However, the success in the field of blood glucose level control modeling and simulating is essentialfor the further development of diabetes prevention and treatment technologies, and creating an artificial pancreas in particular.
Subject(s)
Algorithms , Blood Glucose/metabolism , Diabetes Mellitus/drug therapy , Hypoglycemic Agents/therapeutic use , Models, Theoretical , Diabetes Mellitus/blood , HumansABSTRACT
An architecture for providing an institutional systems infrastructure is proposed. The architecture permits distributed applications while maintaining an integrated patient database.
Subject(s)
Computer Systems , Databases, Factual , Hospital Information Systems , Computer Communication Networks , Hospitals, University , Microcomputers , North Carolina , Pilot ProjectsABSTRACT
A flagging system to identify blood specimens requiring a blood film review and/or differential leukocyte count is described. Its utility in avoiding unnecessary differential counts particularly in outpatients is given. Significant reductions in workload can be anticipated without deterioration of patient care.
