• 한국정보통신학회논문지
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• 제19권3호
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• pp.500-506
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• 2015

본 논문에서는 자성 금속재료인 센더스트(Sendust)를 이용하여 2.4 GHz ISM 대역의 전자파 노이즈 억제를 목적으로 하는 EMI/EMC 대책용 전파흡수체를 설계 제작하였다. CPE (Chlorinated Ploy-ethylene)를 바인더로 하여 압착 Sendust와의 조성비 별로 전파흡수체 샘플을 제작하였고, 이를 분석하여 최적의 조성비를 탐색하였다. 그 결과 최적의 조성비는 Flaked Sendust : CPE = 72.5 : 27.5 wt.%로 밝혀졌다. 전파 흡수체 샘플로부터 도출된 재료정수를 이용하여 두께의 변화에 따른 전파흡수능의 변화를 시뮬레이션 하였으며, 그 결과를 토대로 제작한 전파흡수체의 전파흡수능과 시뮬레이션 결과치가 잘 일치하는 것을 확인하였다. 이 경우, 중심주파수 2.4 GHz에서 5.4 dB의 전파흡수능을 보였으며, 이때 전파흡수체의 정합두께는 0.6 mm로서 종래의 전파흡수체에 비해 초박형이어서 실용성이 높고 고성능화됨을 알았다. 본 논문에 제시한 초박형화 전파흡수체는 전자회로 및 회로부품으로부터 방사되는 전자파를 억제하거나 효율적으로 흡수하여 정보통신기술의 발전에 기여할 것으로 기대된다.

• 한국산업보건학회지
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• 제31권3호
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• pp.202-212
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• 2021

Objectives: The reproductive health of female workers has been extensively investigated in South Korea and other countries worldwide. However, few studies have discussed the reproductive health of male workers. In this study, we reviewed the recent literature that reports on the effects of occupational exposure on the reproductive health of male workers and the health of their children. Methods: In May 2020 we used the PubMed search engine to search the literature over the last 10 years and chose case-control, cohort, and cross-sectional studies and reviews. We selected epidemiological studies that investigated the association between pre-pregnant occupational exposure and the reproductive health of male workers and the health of their children. We excluded case reports, non-epidemiological studies (animal experiments, cellular-level experiments, and similar articles), and studies that described postnatal occupational exposure. Results: We eventually selected 23 studies. The studies that included exclusively male workers reported that those employed in the agricultural sector or those exposed to pesticides showed lower blood levels of reproductive hormones and a high risk of lympho-hematopoietic system cancer in their children. Male workers exposed to complex organic solvents and organic compounds showed a high risk of poor semen quality, increased time to pregnancy, decreased blood levels of reproductive hormones, and a high risk of lympho-hematopoietic system cancer in their children. Male workers employed in occupations that involved significant social contact, or in the leather and livestock industries, and in occupations with high levels of exposure to lead and organic solvents showed a high risk of malignancies, including lympho-hematopoietic system cancer, neuroblastoma, and central nervous system tumors in their children. Studies that investigated both male and female workers reported that children of male smelters showed a high risk of premature birth, and children of male workers exposed to metals showed a high risk of hypospadias and cryptorchidism. Children of male welders and workers employed in the glass, ceramic, and tile industries showed a high risk of premature birth. Conclusion: The findings of this study will serve as basic data for further research on male workers' reproductive health and provide a scientific basis for the development of strategies to protect the reproductive health of males employed in high-risk occupations. Moreover, the results of this study may provide guidelines to improve the understanding of and knowledge on male workers' reproductive health.