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황사 기간 동안에 어린이, 성인, 노인에서의 자각증상과 예방행동에 대한 조사연구
이보은,하은희,박혜숙,권지숙,신경림 韓國學校保健學會 2005 韓國學校保健學會誌 Vol.18 No.1
Purpose: Recently there are scientific evidences for the health effects of Asian dust-storms. Particularly in 2002, the daily average of PM_(10) exceeded 600 and 700 ㎍/㎥ in March and April respectively. We examined the effects of Asian dust-storms on perceived symptoms and preventive behaviors among children, adults, and elders. Method: The subjects of this study were 425 children, 444 adults and 60 elders. A questionnaire survey was carried out on the children and the adults by teachers and on the elders by interviewers to obtain information on demographic variables, perceived symptoms and preventive behaviors, previous respiratory disease, environmental tobacco smoke, and proximity between the house and the road during Asian dust-storms. We analyzed using descriptive statistics, X_(2) test and multiple logistic regression models. After adjustment for potential confounders, we estimated the odds ratios and 95% confidence intervals of the children and the elders for perceived symptoms and preventive behaviors. Result: The elders had a significantly higher prevalence of respiratory symptoms than the other groups. The children had a significantly higher prevalence than the adults in getting URI (1.51), coughing (1.68), rhinorrhea (1.46), fever (2.39) and medication for allergy or asthma (1.90). The children had better behaviors than the elders in closing windows (3.57), taking less outdoor recreational activity (2.59) and staying home (2.60).
이보은,김재근 한국생태학회 2014 Journal of Ecology and Environment Vol.37 No.1
The effect of different turnover time of water on the decomposition of emergent macrophyte litter (Zizania latifoliaGriseb.) was investigated using a microcosm experiment. Microcosm treatment represented different turnover time ofwater; 1, 2, 4 and 8 weeks. The litterbags from each treatment were retrieved every 2 weeks until the 8th week and thewater simultaneously sampled with the litterbag. The dry weight and the content of major cations in the litter, and thecontent of available N, P, and major cations in the water were analyzed. Dry weight loss after 8 weeks indicated the lowerdecay rates under the condition of short turnover time of water. Major cations from the litter and the water showed thatthe leached amounts of K and Mg from the litter were highest in the 2nd week and dramatically decreased from the 4thweek. The dynamics of available nitrogen and phosphorus in the water showed that as the water turnover time was gettinglonger, the amounts of available nitrogen and phosphorus remained higher. These results suggest that wetlands withlonger turnover time of water could maintain the increased nitrogen and phosphorus and no outflow of the nutrientscould cause eutrophication problem.
벚나무류 낙화가 인공 연못생태계의 물질순환에 미치는 영향
이보은,전영준,장유림,김재근 한국습지학회 2015 한국습지학회지 Vol.17 No.2
벚나무류가 식재된 인공 연못에서 벚나무류의 낙화가 연못생태계의 물질순환에 어떠한 영향을 미치는지 확인하기 위해 벚꽃이 분해되는 기간을 달리하여 마이크로코즘 실험을 수행하였다. 벚나무류의 꽃잎을 넣은 망(mesh)의 크기가 1 mm2인 나일론 꽃잎주머니를 제작하였다. 플라스틱 통을 하나의 마이크로코즘 단위로 하여 인공 연못의 유입수를 채우고, 꽃잎주머니를 넣은 처리구와 넣지 않은 대조구를 설정하였다. 처리구에서 꽃잎주머니를 수거하는 시기를 달리한 결과, 실험이 끝난 후 벚꽃잎은 초기 건중량의 32.3%만이 남았으며, 분해율(k)은 7.06 × 10-2 day-1로 나타났다. 벚꽃잎이 분해된 물의 NO3-N 농도는 1.90 mg/L에서 처음 4일 후 급격히 감소하여 0.02 mg/L를 나타낸 반면, NH4-N 농도는 0.03 mg/L에서 분해가 진행되는 동안 계속적으로 증가하여 2.85 mg/L를 나타냈다. PO4-P 농도는 0.03 mg/L에서 꽃잎의 분해에 의해 2.39 mg/L까지 증가하여, 인이 질소에 비해 상대적으로 높은 비율이 무기 형태로 용탈되고 있음을 알 수 있다. 인공 연못에 쌓이는 벚꽃의 양을 추산하고 용탈되는 가용성 질소와 인의 양을 예상한 결과, 벚꽃잎이 분해되어 물에 녹아나온 가용성 인은(0.02 mg/L 증가) 인공 연못의 부영양화를 유발할 수 있는 것으로 판단된다. To identify the effect of fallen cherry blossom on the artificial pond ecosystem, microcosm experiment was conducted into the aquatic decomposition of Prunus species petals. Petals were put in 1mm2 mesh nylon litter bags. For treatment group, one flower litter bag was placed into each pot microcosm (27 × 20 × 8 cm3) filled with influent water from the artificial pond, whereas control group microcosm contained pond water only. Decomposition time were set differently (4, 8, 12, 16 days) among treatment groups. At the end of experiment, most petals were decomposed and only 32.3% of initial dry weight remained with the decay rate (k) of 7.06 × 10-2 day-1. NO3-N concentration of microcosm water decreased sharply from 1.90 mg/L at first to 0.02 mg/L, whereas NH4-N concentration increased from 0.03 mg/L to 2.85 mg/L continually. PO4-P concentration was 0.03 mg/L at first and increased to 2.39 mg/L by decomposition. Therefore, available phosphorus seems to have leached with higher rate than nitrogen from the petals litter. Increase about 0.02 mg/L in PO4-P concentration could be estimated in artificial pond from the calculation on the total quantity of fallen blossoms. This result suggests that available phosphorus from the decomposed Prunus petals could cause eutrophication in the artificial pond.
Simple synthesis of [11C]DASB in HPLC loop and small animal PET imaging study
이보은,조용현,이윤상,정재민 대한방사성의약품학회 2016 Journal of radiopharmaceuticals and molecular prob Vol.2 No.2
As a neurotransmitter, serotonin plays important roles in brain. It relates various neuropsychiatric disorders such as anxiety, depression, schizophrenia. [11C]DASB is a well-known PET tracer for serotonin transporter imaging. In this study, we synthesized [11C]DASB in HPLC loop for simple and rapid production. Total synthesis time was about 40 minutes and the radiochemical purities were over 99%. The specific activity was 51.4 GBq/µmole (n=16). [11C]DASB showed highest uptake in mid-brain that serotonergic nerves are abundant and lowest uptake in cerebellum. In conclusion, we used HPLC loop method for [11C]DASB labeling and this method is useful for production of 11C labeled PET tracers. J Radiopharm Mol Probes 2(2):113-117, 2016