• 한국대기환경학회지
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• 제33권3호
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• pp.233-240
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• 2017

To distinguish between high particulate matter (HPM) and light Asian dust (LAD) events, aerosol optical properties from GOCI were investigated in Seoul from 2014 to 2016. The poor air quality case caused by fine atmospheric particulate matter (i.e., 80<$PM_{10}$<$400{\mu}g/m^3$) is clearly separated from the case of heavy Asian dust that generally shows the $PM_{10}$ concentration more than $400{\mu}g/m^3$. In this study, we have found eight cases for the poor air quality and divided them into the two events(i.e., HPM and LAD). In case of aerosol optical depth (AOD), there was no big difference between two events. However, Angstrom exponent (AE) for HPM events was greater than 1, while that for LAD events less than 1. As a result of comparing aerosol type, non-absorbing fine mode aerosols were dominant for HPM events, but coarse and absorbing coarse mode aerosols for LAD events. Therefore, AE and aerosol type from GOCI can be used to distinguish between two events effectively.

• 수산해양기술연구
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• 제56권2호
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• pp.147-154
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• 2020

The questionnaire survey was carried out to collect basic data to identify the cause of the risk that did not appear in the current data provided by the fishermen's occupational accidents of the National Federation of Fisheries Cooperative (NFFC) to the onsite specialist, such as a fishing master, chief engineer and fisher in stow net fishing vessel from June to July 2018. The results are as follows. A total of 134 cases were surveyed, including 53 cases in Yeosu, 44 cases in Mokpo, 30 cases in Boryeong and 7 cases in Gunsan. Approximately 60% of the respondents on board the stow net fishing vessel were more than 20 years old, and the boarding experience was seasoned and suitable for the respondents. In the 4M analysis by safety accident factor during fishing work, the mechanical factors included 51 cases (25.0%) of decrepit equipment or poor maintenance and 49 cases (24.0%) of systemic error of fishing equipment. The environmental factors exhibited 71 cases (33.5%) of poor communication by mixed manning of foreign fishermen and 63 cases (29.7%) of poor environment such as heavy weather etc. The human factors showed 78 cases (37.3%) of personnel's carelessness and 45 cases (21.5%) of unskillfulness of operating net and haulers. The management factors exhibited 59 cases (32.1%) of work practice of poor safety precautions and 56 cases (30.4%) of inadequacy of education on hazard factor. The results are expected to contribute to the creation of a safe operating environment for stow net fishery, such as a fisher boarding a stow net fishing vessel, enabling the analysis of major causes of working safety accidents by cause.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회논문집(I)
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• pp.399-402
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• 2000

When concrete structures are built in marine environment, they may be deteriorated and have the poor durability and quality caused by steel corrosion or by chemical attack of magnesium or sulfate ions. Especially, Mg ions contained in seawater make concrete surface weaken by chemical reaction with $Ca(OH)_2$ In this study, a concrete structure built in 1947 was investigated to estimate the factors, especially chemical attack, which can cause concrete to deteriorate. Furthermore, the instrumental analysis methods such as XRD and ESEM were performed to find the reactants in concrete under marine environment.

• 환경영향평가
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• 제14권3호
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• pp.135-145
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• 2005

This study was conducted to investigate the characteristics of meteorological environment variation before and after construction of Nak-dong river estuary barrage. We used meteorological data(air temperature, precipitation, relative humidity, visibility, wind) at Gimhae airport meteorological station. The construction of river estuary barrage can change climate at the neighboring districts and influence human's health and vegetable. The construction of Nakdong river estuary barrage brought rise of temperature, decrease of relative humidity and increase of poor visibility frequency.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.2883-2885
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• 2000

ATS(Automatic Transfer Switch), the secondary power supply system prepared for' temporary power fail on main in KEPCO in industrial field or running a important system. is developed. In this development, we prove that the proposed system is safe with results in a few environment testing focused on a solution against a poor environment by making virtual environment for a solution on problems of system reliability to switch more safely.

• 한국환경생태학회지
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• 제35권4호
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• pp.398-407
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• 2021

한반도해송숲의 지형환경, 기상조건, 토양 이화학적 성질과 곰솔의 생육상태를 조사해, 이곳 곰솔의 수세약화 원인을 찾아내고자 했다. 곰솔의 수세가 불량하거나 고사한 지역(수세불량지)과 대조구로서 곰솔의 생육상황이 양호한 지역(수세양호지)으로 나눠 조사했다. 그 결과, 수세불량지의 입목밀도는 수세양호지보다 유의적으로 높았지만, 수관폭은 반대로 수세양호지에서 더 넓었다. 고사목 개체수와 입목밀도는 서로 부(-)의 상관관계를 보였고, 또 입목밀도와 흉고직경·수고·수관고(crown height)·수관폭 사이에서는 부(-)의 상관관계를 보였다. 즉, 입목밀도가 높으면 개체의 수관이 겹쳐 하부 가지가 죽어 수관고와 수관폭이 작아졌다. 이에 엽량 감소에 따른 광합성량이 줄어들어 수고와 직경의 생장량이 적어졌다고 본다. 이로 인해 수세가 약해지면서 해안사구라서 수분·양분의 부족과 강한 조풍 등의 환경압이 가중되어 해안가 근처의 곰솔이 대규모로 죽은 것으로 판단된다. 한반도해송숲의 고사목 발생과 수세약화 원인은 복합적이지만, 곰솔 생장에 따른 적정한 입목밀도 관리 부족이라는 내부요인을 제1 요인으로 꼽을 수 있다. 또 곰솔 생육에 불리한 토양조건과 조풍, 강풍 등의 환경압을 제2 요인이라고 볼 수 있다.

• 한국환경생태학회지
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• 제11권4호
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• pp.462-468
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• 1998

신갈나무 군집과 환경 요인과의 관계를 구명하기 위하여 설악산 한계령 지역과 백담사 부근에서 25개의 조사구를 설치하여 식생조사를 실시하였으며, TWINSPAN과 CCA 방법을 사용하여 분석한 결과는 다음과 같다. 신갈나무림은 신갈나무-피나무 군집, 신갈나무-젓나무 군집, 신갈나무-쪽동백나무 군집과 신갈나무-졸참나무 군집으로 구분할 수 있다. 주요 군집들과 환경요인들과의 관계로 보면 신갈나무-ㅠㅣ나무 군집은 해발고가 다른 군집보다 높고 전질소와 C.E.C.의 양료가 적은 곳에 분포하고 있으며, 신갈나무-젓나무 군집은 해발고가 다른 군집보다 높고, 전질소와 C.E.C.의 양료가 가장 많은 곳에 분포하고 있으며, 신갈나무-쪽동백나무 군집은 해발고가 중간이며, 전질소와 C.E.C.의 양료가 적은 곳에 분포하고 있다. 군집의 분포에 영향을 미치는 환경 요인들은 해발고, C.E.C., 전질소 등이다.

• 한국농촌건축학회논문집
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• 제13권4호
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• pp.1-8
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• 2011

Korea is moving toward an aging society faster than the other advance countries such as the U.S. and France. Such aging phenomena are posing greater problems in rural areas than in urban areas, and particularly, decrease in productivity caused by aging population leads to economic difficulties and hinders the improvement of housing life. The purpose of this research is to examine and identify the housing conditions of the vulnerable in rural areas and to present ways to improve the elderly housing and the housing environment in rural areas and to provide basic data for materializing the policies to enhance the quality of life. The results of this research are as follows. First, the elderly in rural areas were found to receive relatively smooth supports for services related to clothing and food through the government and social organizations. But for the housing problems, it was found that there were not any supports. Second, the poor housing environment may cause diseases to the elderly with weak immunity, so ways to remedy these problems are urgently needed. Third, the vulnerable in rural areas can hardly bear the burden of improving the housing environment, so supports from the government and social organizations are needed. Fourth, ways to support the vulnerable such as households receiving basic living subsidies and to support the poor who are not receiving such subsidies should be explored.

• 보건교육건강증진학회지
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• 제30권5호
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• pp.125-138
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• 2013

Objectives: The purpose of this study is to analyze factors associated with depression among workers in South Korea by socio-economic factors, health behaviors, and working conditions. Methods: Study subjects include 4,251 adults (19 and older) who are currently working using the data from 2009 National Health and Nutrition Survey. Data were analyzed using frequency test, $X^2$ test, and multiple logistic regression. Results: Multiple logistic regression analysis showed that gender (OR=1.91, p<.001), age (OR=1.53, p=.030), marital status (31-39: OR=1.88, p=.029) were significantly related to depressing among socio-economic factors. Next, among health behaviors factors, perceived health status (Poor: OR=1.76, p=.049; Very poor: OR=3.46, p=.002) was statistically significant. Among characteristics of work environment, trust and respect (OR=1.34, p=.049) and working with hidden emotion (OR=1.88, p<.001) were significantly related to depression. Conclusions: In order to manage and reduce depression among workers, it is important to develop appropriate mental health promotion programs both in work places and in regulations.

• Human Ecology Research
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• 제56권2호
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• pp.157-165
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• 2018

Using data from the Panel Study on Korean Children, this study investigated whether children with high levels of problem behaviors adjusted more poorly on the $1^{st}-grade$ than children with low levels of problem behaviors, and whether there was evidence of intra-individual stability in behavior problems over time. Data were analyzed by use of the Latent Growth Model and group differences analyses. Three findings were noteworthy. First, there was evidence of intra-individual and inter-individual variability in behavior problems between poor- and non-poor household children. Second, children with higher initial levels of internalizing and externalizing behaviors at 4 years had lower school readiness scores at 6 years. Finally, children with lower levels of school readiness at 6 years had lower school adjustment scores in $1^{st}$ grade. The results discuss implications for future research and policies for preschool children. With mediating effect of school readiness, developmental trajectories of child's problem behavior have been found to be predictors of delayed achievements in school. The results show that intervention programs are necessary for children with high levels of problem behavior. This study also showed that children who experienced poverty at home could have more difficulties in school readiness and school adjustment.