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This paper describes two whole-body exposure systems for biological effect tests of radio frequency (RF) electromagnetic fields. The first exposure system is designed at 2 GHz band to have a feature of circular polarization for simulating a variety of coupling with humans in daily environment. The second exposure system is designed to simulate a multiple-frequency exposure between 800 MHz and 5.5...
The present study proposed an equation for estimating the WBSAR in human body models for plane-wave exposure at whole-body resonance frequency. The necessity of the present study was that the WBSAR becomes maximal at that frequency and is close to the basic restriction in international guidelines for human protection. Therefore, our attention was focused on the variability of WBSAR in different human...
Recently, there has been an increased concern regarding the effects of electromagnetic radiation emanating from wireless communication devices on the health of children. In order to determine safe levels of exposure, we intend to use computer simulations and numerical human models to estimate the specific absorption rate (SAR) in young children. However, only a few of the existing numerical models...
We compared the SARs of the anatomically realistic model of a three-year-old child exposed to vertically and horizontally polarized electromagnetic waves in the frequency range from 30 MHz to 3 GHz with those of the uniform and nonuniform scaling models. We found that it is important to use the anatomically realistic model for highly precise simulation for three-year-old children.
The numerical dosimetry of women during pregnancy is an important issue in electromagnetic field safety. We had developed a whole-body numerical pregnant-woman model at 26-weeks' gestation. In this study, we developed pregnant-woman models that included the inherent tissues of pregnant women adjusted to the standard reference values at 12- and 20-weeks' gestation by deforming the existing pregnant-woman...
In this paper, the SAR distribution in the fetus was calculated using the numerical model of the pregnant woman by the NHA with the metallic case at 150 MHz. As a result, it has confirmed that the SAR of the NHA at 150 MHz in deep region of the maternal body (y ges 80 mm) is higher than that of the half-wave dipole antenna at 2 GHz. In addition, it has confirmed that the fetus averaged SAR is 38%...
For the purpose of exposure assessment in epidemiological studies on RF exposure and brain cancer risk , 76 Japanese mobile phones were classified, for different use conditions, into small numbers of categories, using SAR characteristics cluster analysis. The categorization was shown consistent with the characteristics of phones obtained from technical specifications and external views. Typical 3D...
Our previous study revealed that a dominant factor influencing the electromagnetic absorption in a human body for far field exposure at GHz bands is the body surface area. Based on this finding, we discussed the correlation between absorption cross section and body surface area of human for far-field exposure at 2 GHz. We employed an FDTD algorithm for a large-scale SAR (specific absorption rate)...
As the diversification of the electromagnetic (EM) environment is spreading, it is essential to estimate the EM exposure in the mother's body and her fetus for pregnant women under various situations. This paper presents the development of the numerical model of a 7-month pregnant woman (composed of 56 organs, which includes inherent organs of pregnant woman) based on the high-resolution whole-body...
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