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김수근 ( Soo Geun Kim ) 한국산업위생학회 2012 한국산업보건학회지 Vol.22 No.1
Objectives: Hazard identification is the most important step in occupational health monitoring at the workplace. This paper reviewed the several related stuffs to the hazard identification in the semiconductor industry. Methods: I checked the MSDS system, chemical toxic informations, trade secrets and by-products by experience and the literature used in semiconductor industry. Results: I found and experienced as follows; (1) There are a few inventory and history of chemicals used in workplace. Toxic information of chemicals to be available is very limited. (2) There are many trade secrets in MSDS for chemical mixtures. It is difficult to identify the accurate information from MSDS. (3) By-products is necessary to identify that they will produce in workplace. Conclusions: It is necessary to regulate the obligations of employers which check the inventory and history of chemicals used in workplace. It is necessary to amend the trade secrets in MSDS system.
이원철 ( Won Cheol Lee ),김수근 ( Soo Geun Kim ),안홍엽 ( Hong Yup Ahn ),이관형 ( Kwan Hyung Yi ),이은희 ( Eun Hee Lee ) 한국산업위생학회 2010 한국산업보건학회지 Vol.20 No.3
South Korea`s industrial injuries are decreasing overall in the last 32 years. Nevertheless, the fatal occupational injury rate is still higher than in developed countries. This study was conducted to help prevention strategies of occupational injuries for the Republic of Korea. Fatal occupational injury rates were obtained from 「Industrial Accident Analysis」 of the Korean Ministry of Labor. Poisson regression was used to assess time trends. Socioeconomic indicators were obtained from the Korea Labor Institute and the Statistics Korea. Fatal occupational injury rates were adjusted by year, and Pearson correlation analysis was used to assess the relationship between the socio-economic indicators and occupational injuries. In 1975, fatal occupational injury rate was 54.8 per 100,000 workers. With somewhat up and down, it was decreased to 21.0in 2006. An annual rate of change for the years 1975-2006 was - 1.83%, and for the years 2002-2006 was -5.02%. As economic growth rate, paricipation rate for the age less than 25 and hours of work per week or year increased, fatal occupational injury rate also increased. Conversely, as GDP per capita, paricipation rate or employment rate for female, paricipation rate for the age 25 or more, hourly compensation costs for production workers and services output as percent of GDP increased, fatal occupational injury rate decreased. By the development of safety techniques and the adoption of more legislative constraints, developed economy reduce occupational injuries. Conversely, economic growth may raise occupational injuries. Therefore, prevention strategies are needed to manage both of them. We need to make an effort to prevent occupational injuries due to not only sexual differences, but also job differences between male and female. Preventive strategies are needed to consider the characteristics of younger workers. Addition to wage, other appropriate variables for work condition should be considered together. Extending work hours is need to be regulated with systemic methods.
화순 홍수조절지의 유입유출 구조물에 대한 수리모형실험 연구
이상화,진광호,류종현,김수근,Lee, Sang-Hwa,Jin, Kwang-Ho,Ryu, Jong-Hyun,Kim, Soo-Geun 한국수자원학회 2012 한국수자원학회논문집 Vol.45 No.7
Recently, a heavy rainfall under climate change causes the flood exceeded river's conveyance. Flood control methods under the limited river width are the increase of embankment, the construction of storage pockets and diversion channel, the dredging of river bed. Hwasun flood control reservoir of washland is designed as the storage pockets and the regulating gate for the control of water level. In this study, the propriety of design was investigated through hydraulic experiments for the circumstances to exclude the constant flood discharge during operation period. In the results, the over flow rate of side weir exceeded the flow of design and indicated to be able to discharge the designed flow in the regulating gate opened 1.1 m. The high velocity 7.1 m/s behind the gate has investigated to reduce under 3.3 m/s by the baffle block. 최근 기상변화에 의한 집중호우는 하천의 통수능력을 초과하는 홍수를 발생시키고 있다. 하천의 폭이 제한된 상태에서 이러한 초과 홍수에 대비할 수 있는 관리방법은 제방증고, 저류지 및 방수로 건설, 하상 준설 등을 생각할 수 있다. 천변저류지인 화순홍수조절지는 저류지와 수위조절을 위한 제수문이 설계되어 있다. 본 연구는 저류지 운영시간동안 일정 홍수량만을 배제해야 할 상황에 대해 설계의 적정성을 수리모형실험을 통해 검토하였다. 검토결과 저류지 유입부의 횡월류위어 월류량은 설계상의 월류량을 초과하였고, 제수문 1.1m 개방시 설계유량($326m^3/s$)을 방류할 수 있는 것으로 나타났다. 설계유량 방류시 제수문 직하류에 7.19m/s의 고유속은 baffle block을 설치할 경우 3.3m/s까지 저감시킬 수 있는 것으로 검토되었다.
서현주,김종순,장윤균,박일근,김수근,Seo, Hyun-Ju,Kim, Chong-Soon,Chang, Yun-Kyun,Park, Il-Geun,Kim, Soo-Geun 대한예방의학회 2006 예방의학회지 Vol.39 No.3
Objectives: Cardiovascular disease is one of the main causes of death and morbidity in Korea. In this study, the prevalence and incidence of developing hypertension in a male-workers' cohort were investigated during 3-years follow-up with a view to find the risk factors that affected the development of hypertension. Methods: Among the 5,374 people who participated in a routine health check up, 3,852 people with normal blood pressure and who had no history of hypertension were prospectively followed up for 3 years. The classification of hypertension was based on the JNC7 report (the Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure). Life style factors and underlying diseases that were related to the risk factors of hypertension were collected by using a self-report questionnaires via the internet. Results: The prevalence of hypertension was 28.3% (1,520/5,374) at the first screening (2001). It was found that the incidence in 2004 of hypertension for the follow-up subjects (3,711) who had normal blood pressure in 2001 was 7.6 per 100 person-year. Multiple logistic regression analysis of the variables related to the risk factors of hypertension was carried out. The relative risks were 1.037 (95% CI=1.022-1.053) as the age increased 1 year and 1.039 (95% CI=1.023-1.055) as the body mass index increased $1kg/m^2$. The relative risk for the prehypertensive group was 2.501 (95% CI=1.986-3.149) compared to the normotensive group. These results showed that age, body mass index and the baseline blood pressure were significantly related to the incidence of hypertension. Conclusions: The incidence of hypertension was 7.6 per 100 person-year during follow-up. It was concluded that the risk factors for developing hypertension in the short-term were age, BMI, and prehypertension; Especially, this showed that it is necessary for prehypertensives to manage their body weight and blood pressure to prevent hypertension in middle-age by modifying their life style.
지상레이다의 PT-파형 수신신호와 항공기 추적정보를 이용한 항공기 도플러 프로파일 추출
오현석(Hyun-Seok Oh),김수근(Soo-Geun Kim) 한국전자파학회 2017 한국전자파학회논문지 Vol.28 No.2
본 논문에서는 지상레이다가 추적 중인 항공기로부터 획득한 수신신호를 이용하여 도플러 형상(signature)을 추출하였다. 이를 위해 펄스열(pulse train) 파형의 수학적 모델로부터 레이다의 도플러 해상도를 검증하고, 비행 중인 항공기 도플러 형상이 엔진에 대한 레이다 측각(aspect angle)과 엔진의 제원에 따라 결정됨을 보였다. 이를 확인하기 위해 비행 중인 항공기에서 반사된 레이다 수신신호를 레이다 수신신호 저장장치를 이용하여 획득하고, 수신신호로부터 도플러 형상을 추출한 후, 항공기 추적 정보로부터 엔진에 대한 레이다 측각을 추정하였다. 이들 결과를 조합하여 측각에 대한 상대 도플러 형상 차이를 확인하고, 레이다에 사용가능한 표적인식용 도플러 프로파일을 제안하였다. This paper has been shown for the extraction of Doppler signature from the radar signal for an air-breathing targets tracked in the ground radar. For the extractions, a Doppler resolution is confirmed from mathematical modeling of PT(pulse train) waveform. Doppler signatures of air-breathing target are varied to radar aspect angle of engine and are determined from physical parameter of jet engine. To confirm such Doppler signatures, the radar signal reflected from the air-breathing target is obtained by our radar signal storage. After this extraction, radar aspect angle of engine has estimated from tracking information. Relative differences of Doppler signatures to radar aspect angle of engine are verified from these results and Doppler profiles for radar target identification appliance are presented.