The objective of this study was to investigate ELF-MF exposure levels of the elderly groups in their living environments using 24-hour personal measurement. In addition, EMF risk perception was investigated. Through evaluations of ELF-MF exposure levels in the proximity of the participants of 58 elderly groups, it was found that TWAam was 1.31 mG (TWAgm: 0.84). ELF-MF exposure levels of the elderly group that live in the proximity of a non-visible power line was high, but there were no statistically significant differences between the non-visible power line elderly group and visible power line elderly group. Moreover, there were no statistically significant differences in ELF-MF exposure according to gender, age, city classification, incomes, residence type, and size. The results showed that the perception of the ELF-MF was very low, as indicated by more than roughly 58.6% of the elderly surveyed saying that they did not know what ELF-MF was. In addition, there was no awareness among the group of how to avoid behavior of EMF from some electric equipment and facilities. Thus, these results will provide useful data for the determination of ELF-MF management and risk communication methods in the living environment for elderly people.

This study measured and analyzed the heavy metal (Cd, As) content of fine dust in the city of Gwangyang, Jeonnam from September 19 to September 22, 2016. For cadmium, the arithmetic average was 0.21 ng/m3 (0.12~0.49 ng/ m3), which did not exceed the WHO's recommended level. The average of arsenic was 2.41 ng/m3 (0.30~142.08 ng/ m3) and the geometric mean was 11.18 ng/m3, which exceeded the WHO's recommended standard in 16 out of 24 measurements. In the case of cadmium, the CTE of male was 9.22 × 10−8 RME 1.91 × 10−7 and the female CTE was 9.44 × 10−8 RME 1.92 × 10−7, which did not exceed the EPA limit of CTE 2.18 × 10−5 RME 1.51 × 10−4 for men and CTE 2.23 × 10−5 RME 1.51 × 10−4 For women, CTE 2.23 × 10−5 RME 1.51 × 10−4 results were obtained, which exceeded the EPA's recommended limit and also exceeded the maximum allowable limit of 10-4.

The study conducted statistical analysis of survey on the 239 workers participating in national Tower Crane installation/dismantlement in order to identify work environment and health hazard exposure of Tower Crane workers. Consequently for work related safety status of Tower Crane workers, the number of installation/dismantlement work was the highest at 15-20 times per month, and safety equipments were not arranged at work and they felt highly anxious when boarding on the Tower Crane. Furthermore, it is found that they feel anxious working in the influence of the weather, noise, vibration, wind, the sun ray, and structure characteristic. They have very low satisfaction in the insecureness of workplace and the work environment, and recognizes that their work affect highly on the health. 81.6% of workers have experienced accident at work, the cause of accidents were mainly due to poor work environment, and the health abnormality they have experienced were mostly fatigue and concentration reduction. For job stress, job demand and conflict in relationship were the highest sections. Total 66.5% of workers complained of musculoskeletal disorder related subjective symptom, and back pain patients were the highest of all groups.

An elementary school is an important public place for children and it is where they spend most of their days. Ten elementary schools of environmental pollutants were measured in the classroom, playground and school zones (June 19 ~ Nov 1, 2012). Dust measurements of some schools were more indoor air. Measurements of black carbon concentrations were higher overall school zones. Also, in the case of formaldehyde, benzene and some environmental standards were exceeded. In the case of outdoor pollutants not statistically significant, but in some cars and vans that were correlated with pollutants. Thus, strategies and actions are necessary that will protect the health of children in schools from environmental pollutants.

This study was conducted to compare the value of the working environment measurement with the expected exposure value drawn by using a program, thereby going to investigate whether it is available to the risk assessment of domestic workplace. We used the ECETOC TRA program which is one of the exposure predictive models. Four kinds of substances were measured in two workplace which was exposed to organic solvents and one kind of substance was measured in three workplace which was exposed to dusts and then an exposure assessment of chemical risk factors was conducted. The result value of the working environment measurement, solid substance exceeded standard in one site, and it was found that the other solid and liquid substances were within the standard. The value of the exposure assessment program showd the same result; it was higher than the value of the working environment measurement, suggesting that due to its nature, the exposure assessment program is run only on the worst situation. Therefore, it was found that when the exposure assesment program is used, variables should be substituted only after accurately assessing the workplace and it is a good idea to assess the risk beforehand with the exposure assessment program in the case of the workplace which employs no more than 5 people and where it is hard to assess the working environment.

해안 지역에 시공된 철근 콘크리트 구조물은 해수 중의 염소 이온에 의해 내부 철근이 부식하게 된다. 특히 해안지역에서는 해수에 침지되는 경우뿐만 아니라 조수간만 및 비래염분의 영향을 받기 때문에 이에 대한 고려가 필수적이다. 본 연구에서는 3가지 수준의 노출 환경(침지대, 간만대, 비말대)과 노출기간 180일, 365일, 730일을 고려하여 해양환경노출실험을 실시하였다. 대상 배합은 3가지 수준의 물-결합재 비 및 2가지 수준의 플라이애시 치환률(0 %, 30 %)을 고려하여 설정하였다. 모든 노출조건에서 플라이 애시 치환 배합이 OPC 배합 대비 낮은 겉보기 염화물 확산계수를 나타내었으며, 이는 플라이애시의 포졸란 반응이 원인으로 사료된다. 플라이애시 배합은 노출 기간 180일에서는 플라이애시 치환 배합이 OPC 배합 대비 최대 63 5 %의 감소율을, 노출 기간 730일 에서는 최대 55.8 %의 감소율을 나타내었다. 노출 조건에 따른 확산계수 거동을 평가한 결과, 플라이애시 치환 배합에서는 간만대, 침지대, 비말대 순으로 확산계수가 평가되었다. 간만대에서는 건습이 반복되어 염화물 이온의 침투가 빠르게 일어나는 것으로 보인다.