부산대학교 도서관

The subway attendant is exposed to the radio frequency (RF) electromagnetic exposure of leaky coaxial cable (LCX) which was employed for the subway wireless communication system on the subway platform. To efectively evaluate the safety of subway attendant in this electromagnetic environment, the LCX and human model have been numerically designed. The induced electric feld (E-feld) and specifc absorption rate (SAR) in the human body were obtained by the fnite element software HFSS (High Frequency Structure Simulator). Results show that the maximum E-feld value in the human tissues at 0.9, 1.8 and 2.4 GHz are 1.7850× 10−2 V/m, 3.9995× 10−2 V/m and 8.6827× 10−2 V/m, respectively, and the maximum SAR value in the human tissues are 1.3017× 10−7 W/kg, 1.3267× 10−6 W/kg and 3.6487× 10−6 W/kg, respectively. It can be found that the induced E-feld and SAR in the human tissues increases with frequency. Simulation results at three frequencies were compared with the occupational electromagnetic exposure limits by the International Commission on Non-Ionizing Radiation Protection (ICNIRP). Results were well below the ICNIRP limits, which indicate that the health risk of the subway attendant exposed to RF electromagnetic on the subway platform is very low.