Four-terminal parameter method

The unknown coefficients Vf and in the general solution expressed as Equation 1.110 are determined from boundary conditions. There are many approaches to obtain voltage and current solutions in a multiconductor system. The most well-known method is the four-terminal parameter (F-parameter) method of two-port circuit theory. The impedance parameter (Z-parameter) and the admittance parameter (Y-parameter) methods are also well known. It should be noted that the F-parameter method is not suitable for application in high-frequency regions, while the Z- and F-parameter methods are not suitable in low-frequency regions because of the nature of h5q)erbolic functions. 

This section describes an analytical method of calculating induced voltages and currents in a complex induced circuit, such as a cascaded pipeline with a few power lines, based on a conventional four-terminal parameter (f-parameter) formulation. The F-parameter formulation itself is well known, and it is straightforward to write a theoretical formula of the F-parameter for a multiphase circuit [38,45]. Thus, the calculation of the induced voltages and currents require a computer, that is, a software such as the EMTP. The method explained here replaces the multiphase F-parameter by a singlephase parameter by introducing an artificially induced current. The method is applied to a cascaded pipeline where the circuit parameters, the induced currents, and the boundary conditions are different in each part of the pipeline. The basic characteristic of the induced voltage and current distribution... 

The advantages of using non-compartmental methods for calculating pharmacokinetic parameters, such as systemic clearance (CZg), volume of distribution (Vd(area))/ systemic availability (F) and mean residence time (MRT), are that they can be applied to any route of administration and do not entail the selection of a compartmental pharmacokinetic model. The important assumption made, however, is that the absorption and disposition processes for the drug being studied obey first-order (linear) pharmacokinetic behaviour. The first-order elimination rate constant (and half-life) of the drug can be calculated by regression analysis of the terminal four to six measured plasma... 

---