[en] ELF (extremely low frequency) refers to an electromagnetic field having a frequency much lower than the frequencies of signals typically used in communications. The most common ELF field sources are power lines and substations. Some studies suggest that ELF fields might have detrimental health effects on humans exposed to them for long periods of time. On the other hand, some scientists believe that the data are not sufficient to support the conclusion that ELF frequency electromagnetic fields in the living environment cause cancer or lead to reproductive and developmental abnormalities. According as these reports, studies on the ELF field exposure have increased in recent years. In this study, a lumped-parameter circuit model of a variously postured human body is investigated. The current distribution calculated inside a variously postured human body is induced by the quasi static coupling with an applied electric field. The human body has previously been partitioned into some blocks. The set of block capacitances has been determined by a procedure based on the diak optic theory. The human body has been assumed as being a perfectly conducting multi-spheroidal structure in the diak optic theory. Efficiency of the diak optic method is discussed

[en] This paper examines estimation of the extremely low frequency magnetic fields (MF) in the power substation. First, the results of the previous relevant research studies and the MF measurements in a sample power substation are presented. Then, a fuzzy logic model based on the geometric definitions in order to estimate the MF distribution is explained. Visual software, which has a three-dimensional screening unit, based on the fuzzy logic technique, has been developed. (authors)