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천수만 해역에서 장마기 담수 방류가 플랑크톤에 미치는 영향
이상우,박철,이두별,이재광,Lee, Sangwoo,Park, Chul,Lee, Doobyoul,Lee, Jaegwang 한국해양학회 2014 바다 Vol.19 No.1
The impact of freshwater discharge on plankton was investigated in a semi-closed Cheonsu Bay during the rainy season. Field observations for environmental factors (seawater temperatures, salinities, chlorophyll a concentrations and nutrient concentrations) and zooplankton sampling were carried out from June 27 to September 1, 2012 at about 10 days interval. The relationship between the measured parameters and estimated values of zooplankton abundance were examined. After freshwater discharge, nutrient concentrations increased up to about twice and resultant increase of chlorophyll a followed within about 10 days. Both positive and negative impacts on zooplankton were observed. Positive one was the numerical response of zooplankton on this increased food supply, and negative one was the increased mortality caused by sudden changes in salinity. Maximum mortality of copepods was found to be up to 40%, although fast sinking of carcass made it difficult to estimate reliable mortality caused by salinity shock.
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빈곤노인과 비빈곤노인의 자살생각 영향요인에 관한 종단연구: 패널 로짓 모형의 활용
이상우 ( Lee Sangwoo ) 한국보건사회연구원 2017 保健社會硏究 Vol.37 No.3
This study aims to analyze the predictors of suicide ideation in poor and non-poor older people. This study used the Korean Welfare Panel Study (2012-2015) and conducted panel logit random effect model. First, the results showed a slight increase over time in the level of suicide ideation among the respondents. Second, public assistance, economic activity, annual income, home ownership had significantly effect on suicide ideation in poor older people. Depression, self-esteem, gender, age, household type were associated with suicide ideation. Third, on the other hand, annual income was the only economic factor with a significant effect on suicide ideation in non-poor older people. And they were affected by the variables such as depression, self-esteem, life satisfaction, chronic disease, age, marital status, household type. In sum, this study found that suicide ideation in non-poor older people was significantly associated with their physical health and marital status. Suicide ideation of poor older people, however, was more strongly associated with economic conditions such as poverty, job status, income and home ownership. Psychological factors such as depression and self-esteem verified predictors on suicide ideation irrespective of poverty. Implications and limitation were discussed based on the study findings.
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