군내 음용지하수 중 라돈농도 조사

전철구 ( Jeon Cheolgu ),이광진 ( Lee Gwangjin ),윤경진 ( Yun Kyeongjin ),김민호 ( Kim Minho ),최수정 ( Choi Sujeong ) 국군의무사령부 2015 대한군진의학학술지 Vol.46 No.1

Objective : This research was conducted to present the way to reduce the concentrations of its exposure to military men by examining radon concentrations in underground water. Method : We selected military bases in Gangwon-do, Chungcheong-do, Kyungsang-do and Jeonra-do. Sampling sites were tube wells, water tanks, washrooms, and water purifiers. We sampled 706ml of underground water from each sites using the measuring kit and exposed these samples in radon detector for 48 hours, then analyzed the concentration. Results : The average radon concentration in the underground water of Gangwon-do area was the highest as 797.67(±1,025.19) pCi/l. For types of sampling sites, tube well was 1,288.08(±1,883.63) pCi/, water tank was 725.12(±990.17) pCi/l, washroom was 666.78(±945.00) pCi/l, and water purifier was 218.07(±302.73) pCi/l. The concentration distribution of each sampling sites, 55.3∼97.2% were below 1,000 pCi/l and 1.9∼2.6% were above 4,000 pCi/l. Conclusion : Concentrations in some tube wells, water tanks, and washrooms were over 4,000 pCi/l, which is a recommended value, so we have to further investigate if this is related to increment of indoor radon concentrations. Furthermore, using highly concentrated underground water in limited space for a long time can be harmful. Thus, it is necessary to ventilate adequately and restrain the continuous use. Thus, in order to use underground water for drinking, we need to ensure its safety by going through regular tests.

사단급 부대 유해 작업환경 실태 및 관리방안

전철구 ( Jeon Cheolgu ),이광진 ( Lee Gwangjin ),윤경진 ( Yun Kyeongjin ) 국군의무사령부 2015 대한군진의학학술지 Vol.46 No.1

Objectives : Insufficient management of harmful working environment in infantry divisions lead to the possibility of workers being exposed to the workplace related disorders. Through harmful working environment condition investigations, an appropriate management plan is to be suggested. Methods : By conducting interviews with each infantry divisional workplace managers, status of individual workplace environment could be investigated. surveys related to the working environment were given out to the workers. Results : The investigation revealed that the harmful working environment conditions included welding, washing with chemical solvents, soldering of communicative equipment, and woodworking. In the survey, 56% of the workers were satisfied with their working environment, but 19.1% of the workers felt seriously concerned about the harmful conditions of their workplace. 30% of the workers replied that installing ventilation systems could advance the conditions and has the highest priority in terms of improving the workplace. 29.8% of the workers replied that they have received safety and health education. 25.7% also answered that the most desired information to be included in the education was the effect of harmful substances on health. Conclusions : The result of the investigation on infantry division harmful working environment conditions revealed that the working procedures were being carried out in small scales, but harmful factors such as noise, chemical dust, organic compounds, and heavy metals were affecting the workers' health. Moreover, health management of workers has not been carried out until now, and immediate attention of prevention of occupational diseases is needed. Therefore, it is necessary to reinforce harmful factors sampling of the workplace environment, workers' health diagnosis and industrial disease prevention through safety and health education.

군 생활관 환기주기 설정을 위한 환기효과 비교

전철구 ( Jeon Cheolgu ),이버들 ( Lee Buddle ),이광진 ( Lee Gwang Jin ),신윤희 ( Shin Yunhee ),정해도 ( Jeong Hadoo ) 국군의무사령부 2018 대한군진의학학술지 Vol.49 No.1

Objectives : The purpose of this study was to compare indoor air pollution levels and to suggest appropriate ventilation methods for military living room. Methods : To compare the air pollution levels of flat bed type and bed type dormitories by selecting four divisions of educational camps, and to compare the effects of natural and mechanical ventilation for dirty dormitories. Investigation items are carbon dioxide, fine dust(PM10), Total aerobic bacteria. Results : Indoor air pollution was higher in flat bed type dwelling. Natural ventilation was best when door and two windows were opened for 10 minutes at 1 hour intervals and the concentration of carbon dioxide was 700∼2,500ppm. In case of mechanical ventilation, the ventilation system was operated continuously and the door was opened for 10 minutes at intervals of 1 hour and the external air was introduced. The carbon dioxide concentration was 650∼1,580ppm. During the summer, ventilation did not occur during the operation of the air conditioner, so the concentration of carbon dioxide was high but the concentration decreased when the window was opened. Conclusions : In recent year, it is necessary to check the fine dust forecast and determine whether to ventilate because the number of days with high concentration of fine dust is increasing in the air. In the long term, it is necessary to install ventilation device which is not influenced by winter warming and usual outside air pollution desirable.

UAV 소음발생 특성 및 청력에 미치는 영향

전철구 ( Jeon Cheolgu ) 국군의무사령부 2014 대한군진의학학술지 Vol.45 No.1

Objective: This research has been conducted in order to analyze the characteristics and the effects of the noise that occurs during the pretest of the UAV and to prevent the loss of hearing. Method: We measured the noise which occurs during the pretest of the UAV by varying engine output and workers. We found out the status of hearing loss, using the results of hearing tests that are conducted between 2011 and 2013. Results: TWA was 83.4∼91.2dB(A), which was below the exposure limit. The engine output of 6000rpm was the highest with 109.4dB. The year of 2011 had the highest loss of hearing capacity with a rate of 28.4%. In age groups, a group with over 40 year olds had the highest rate of 80.8% in 2013. In years of experience, a group with over 20 years of working had the highest rate of 90.9% in 2013. After comparing hearing capacity loss using method of 6 division, the left ear was 33.4dB, the right ear was 33.9dB. In the case of frequency, 4000Hz had the highest hearing capacity loss with 56.9dB. Conclusion: We have to take some measures about the origin of the noise and minimize the number of people who are being exposed to the noise. Also, ear-protection gears have to be varied by the characteristics of the workers or the noises. Furthermore, it is recommended to use ear-protection gears with added communication device.

군내 아크용접 작업자들의 자외선 노출과 광각막염 발생현황

전철구 ( Jeon Cheolgu ),윤경진 ( Yun Kyeongjin ),김민호 ( Kim Minho ),최수정 ( Choi Sujeong ) 국군의무사령부 2017 대한군진의학학술지 Vol.48 No.1

Objectives: The purpose of this study is to measure the intensity of ultraviolet rays generated by arc welding and to minimize the exposure of ultraviolet rays to welders. Methods : We conducted a survey on the status of Photokeratitis in 73 workers who measured the ultraviolet rays and performed the direct welding work during the welding work of 8 hazardous environment workplaces in the military. Results: The reduction rate from lm to 56%, 2m to 84%, and 3m to 93% according to the distance of ultraviolet rays generated during welding operation. Maximum exposure time of ultraviolet rays was lm to 9sec, lm to 21sec, 2m to 58sec, and 3m to 130sec. The recommended shade number for each distance was found to be #16 at 1m, #15 at 2m, #14 at 3m. The intensity of ultraviolet rays at the measurement position was 142㎼/㎠, the highest value measured at the left side, 78㎼/㎠ at the front side, and 56㎼/㎠ at the right side. 30(41.1%) answered that they had experienced Photokeratitis due to welding light. Conclusions: The number of the welders helmet to be worn when welding is different according to the distance, but it is preferable to wear it in the range of #14~#16. Since the left or front side of the welders has a lot of exposure to ultraviolet rays, when the welding workspace is placed, other workers should not be placed in that position. In case of welding Photokeratitis, it is preferable to visit the medical institution rather than the folk remedies, and periodic safety and health education should be provided to the welding workers to improve the prevention effects.

훈련병 생활관 공기청정기의 폐렴예방 효과 연구

이버들 ( Buddle Lee ),석웅 ( Woong Seok ),임형렬 ( Hyungryul Lim ),전철구 ( Cheolgu Jeon ),서남주 ( Namjoo Seo ) 국군의무사령부 2019 대한군진의학학술지 Vol.50 No.1

Objectives; The purpose of this study is to install an air purifier at the army training center dormitory and to check the pneumonia prevention effect according to the air quality Methods; We selected unit with frequent pneumonia and studied between 568 people who used air purifiers and 1,710 people who did not use them from November 30, 2017 to April 27, 2018. PM2.5, PM10, carbon dioxide and VOC were measured at 9points in both the air cleaner and non-use groups, and were performed every 2hours from 22:00 to 06:00 the next day. The number of pneumonia diagnoses and upper respiratory tract infections between the air pufier and no-use group were checked and statistically verified. Results; Mean±SD of PM2.5, PM10 was 29.7±48.0㎍/㎥, 55.9±135.1㎍/㎥ for air purifier use group, 115.0±346㎍/㎥, 259.0±371.7㎍/㎥ for nonuse group, and significantly lower for air purifier use group.(p<0.05) Mean±SD of carbon dioxide, VOC was 2,439±1,042ppm, 429.9±146.3㎍/㎥ for air purifier use group, 3,147±1388ppm, 589±264㎍/㎥ for nonuse group, and significantly lower for air purifier use group.(p< 0.05) RR(Relative Risk) of pneumonia patients in the air purifier and non-use group was 4.65, but the P-value was 0.08.(p >0.05). Conclusions; Air purifiers improve the air quality of the training dormitory, but have not proved sufficient to prevent pneumonia.

군 지하벙커 근무자의 직무스트레스 및 환경인식 실태

송보영 ( Boyoung Song ),문종윤 ( Jongyoon Moon ),김민호 ( Minho Kim ),전철구 ( Cheolgu Jeon ),윤경진 ( Gyungjin Yoon ) 국군의무사령부 2017 대한군진의학학술지 Vol.48 No.1

Mean age of subjects is 37.4 years old, average working years are 4.5 years and working weeks are 51.5 hours. Assessment was conducted based on legislation of the Ministry of Environment : the Law on indoor air quality of multiuse facilities. Carbon dioxide at 5 multiuse facilities out of 10 exceeds the standard. Radon was found in A bunker. In addition, 2 bunkers had high humidity and mould spores. It shows bad ventilation in the facilities. 44 percents (55 people) replied at dissatisfaction environmental satisfaction analysis of workers and factors are as follows : dusty condition in the air ( 67% ), feeling too environmental density ( 61.1% ), poor ventilation ( 57.8% ), poor air circulation ( 56.2% ) As a result of the analysis, working environment is negatively affected by air quality rather than indoor temperature, humidity and light. We evaluated with Korean job stress measuring instrument to have objectivity. As a result, underground bunker workers showed lower job stress than average job stress of Korean workers in all fields except conflict field. However, significant results has come out as a result of recent analysis conducted with stress points. This analysis is based on the stress points of bunker workers. As a result of comparative analysis of job stress according to working career, Workers who have worked from 3 years to 10 years showed 44.4 points which is 11.1 points higher than median, 33.3, and it is the highest 25%. It is relatively high in physical environment which the middle officials feel. For workers whose working weeks are more than 70 hours, they feel more stress in physical environment than other group. It means that working environment is not a limit for soldiers to perform their duties but if they are exposed for a long time, it can be harmful. Therefore, we suggest that the military find various stress factors, manage them actively and keep health effect evaluation for long-term workers.