[논문]극저주파 자계의 노출 평가에 대한 연구

김응식; 김명훈; 민석원

doi:10.14346/jkosos.2017.32.1.33

극저주파 자계의 노출 평가에 대한 연구
A Study on the Exposure Assessment of Extremely Low Frequency Magnetic Fields 원문보기

한국안전학회지 = Journal of the Korean Society of Safety, v.32 no.1, 2017년, pp.33 - 40

김응식 (호서대학교 안전보건학과) , 김명훈 (호서대학교 안전보건학과) , 민석원 (순천향대학교 전기공학과)

Abstract ▼ AI-Helper

This paper addresses the assessment methods used to evaluate the magnetic exposure of a human to ELF EMF (Extremely Low Frequency Electromagnetic Field) which is caused by the process of power delivery from 60 Hz commercial power. These days the main concern is primarily focused on the magnetic field. For the exposure assessment, both numerical studies and laboratory experiments were studied and the results of the two compared for methodological suitability. The numerical analyses employ the Impedance Method (IM), Boundary Element Method (BEM), and Finite Element Method (FEM) and the laboratory experiments used various human phantom models made with conductivities congruent to human organs and then exposed to uniform/non-uniform magnetic fields to produce eddy currents. Under these conditions a number of examples have been evaluated and the reliability assessed to present the pros and cons of each methodology.

주제어

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가설 설정

- FEM should be adopted if the model has complex composite media like a human inner organ.
The current density results are shown in Fig. 13. The three sets of values do not agree exactly, but show a similar tendency with a permissible level of error.
4) In a real human body the situation is more complicated, as many different types of material are present. Therefore the accurate modeling of a body is directly related to the evaluation of the exact values.

대상 데이터

The model is 400 mm in diameter and is 40 mm tall and is modeled after the human tomogram found8,9).
Its core consists of a twisted wire pair wrapped by a braided shield and aluminum tape. The probe has three electrodes, one of which comes from the grounded braided shield wire and is placed in the middle of the other two electrodes. The electrode housing is filled with silicone and epoxy resin.
The tests consisted of four media with different conductivities: brain: 0.14 S/m, cerebrospinal fluid: 1.5 S/m, skull: 0.016 S/m, and scalp: 0.341 S/m.

성능/효과

3) Multi-material models can be characterized by the three numerical methods used in this study and precise solutions can be obtained. Therefore if a numerical method is chosen, the numerical error is of no particular importance except for special cases.
6) The current density distributions measured in a human phantom and the concurrent calculations show similar patterns in each case, which proves that all of the assessment tools used for ELF EMF exposure are reasonable.

참고문헌 (12)

International Commission on Non-Ionizing Radiation Protection, "ICNIRP Guidelines for Limiting Exposure to Time-Varying Electric, Magnetic, and Electromagnetic Fields (up to 100 kHz)", Health Phys., Vol. 99, pp. 818-836, 2010.
International Commission on Non-Ionizing Radiation Protection, "Guidelines for Limiting Exposure to Time- Varying Electric, Magnetic, and Electromagnetic Fields (up to 300 GHz)", Health Phys., Vol. 74, pp. 494-522, 1998.
D. L. Miller, "Miniature-Probe Measurements of Electric Fields and Currents Induced by 60Hz Magnetic Field in Rat and Human Models", Bioelectromagnetics, Vol. 17 No. 3 pp. 167-173, 1991.
M. Eberdt, P. K. Brown, and G. Lazzi, "Two-Dimensional SPICE-Linked Multiresolution Impedance Method for Low-Frequency Electromagnetic Interactions", IEEE Trans. on Biomedical Eng., Vol. 50, No. 7, 2003.
Mohammad Nadeem, Thorleif Thorlin, Om P. Gandhi and Mikael Persson, "Computation of Electric and Magnetic Stimulation in Human Head Using the 3-D Impedance Method", IEEE Trans. on Biomedical Eng., Vol. 50, No. 7, 2003.
A. J. Davies, "The Finite Element Method: A First Approach", The Mathematical Gazette, Vol. 65, No. 431, pp.60-60, 1981.
V. Thomee, "From Finite Differences to Finite elements: A Short History of Numerical Analysis of Partial Differential Equations", J. Comput. Appl. Math., Vol.128, pp.1-54, 2001.

상세보기
T. W. Dawson, K. Caputa and M. A. Stuchly, "A Comparison of 60 Hz Uniform Magnetic and Electric Induction in the Human Body", Phy. Med. Biol., Vol.42, pp. 2319-2329, 1997.

상세보기
T. W. Dawson, K. Caputa and M. A. Stuchly, "Numerical Evaluation of 60 Hz Magnetic Induction in the Human Body in Complex Occupational Environments", Phy. Med. Biol., Vol.44, pp.1025-1040, 1999.

상세보기
H. I. Ahn, "A Study on Current Distribution Induced in Human Models by Low-Frequency Magnetic Fields", Ph. D. Thesis, Safety Eng. Hoseo Univ. 2003.
S. -W. Min and J. -H. Park, "Magnetic Field Reduction Characteristics of Hot-Line Worker's Shielding Wear for 765 ㎸ Double Circuit Transmission Line", Trans. KIEE. Vol. 56, No. 9, pp. 1521-1706, 2007.
K. Yamazaki, T. Kawamoto, H. Fujinami and T. Shigemitsu, "Investigation of ELF Magnetically Induced Current Inside Human Body - Development of Estimation Tools and Effect of Organ Conductivity", Trans. IEE Japan, Vol. 120-A, pp. 81-87, 2000.

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