Epidemiology is concerned with the incidence of disease in populations and does not address the question of the cause of an individual's disease.This question, sometimes referred to as specific causation, is beyond the domain of the science of epidemiology.he subdiscipline of forensic epidemiology is directed at the investigation of specific causation of disease or injury in individuals or groups of individuals in instances in which causation is disputed or is unclear, for presentation in legal settings.
Major system characteristics. Tacan stands for Tactical Air Navigation and is a system which, working in the u.h.f. band, between 962 and 1,214 Mc/s, gives to a pilot continuous information as to his range and bearing from a beacon.
Difference between DME and TACAN Air Navigation Systems. This page compares DME and TACAN used in Air Navigation. It mentions basics of these systems and provide difference between DME and TACAN. Both these systems are used in Aeronautical communication between Aircrafts and Ground stations. Following sections describes basics of these systems including channel frequencies, components and specifications.