• 한국대기환경학회지
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• 제27권5호
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• pp.603-613
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• 2011

The collection of $PM_{10}$ and $PM_{2.5}$ samples was made at Gosan site of Jeju Island. Their ionic compositions of both inorganic and organic phases were then analyzed to examine their acidification and neutralization characteristics in atmospheric aerosols. The mass concentrations of $PM_{10}$ and $PM_{2.5}$ at Gosan site were $37.6{\pm}20.1$ and $22.9{\pm}14.3{\mu}g/m^3$, respectively, showing the content ratio of $PM_{2.5}$ to $PM_{10}$ as 61.0%. In the evaluation of ionic balance, the correlation coefficients (r) between the sums of cationic and anionic equivalent concentrations were excellent with 0.982 ($PM_{10}$) and 0.991 ($PM_{2.5}$). The concentration ratios of $PM_{2.5}/PM_{10}$ derived for nss-$SO_4^{2-}$, $NO_3^-$, and $NH_4^+$ were 0.94, 0.56, and 1.02, respectively, indicating the relative dominance of fine fractions. The acidifying capacity of inorganic anions ($SO_4^{2-}$ and $NO_3^-$) in $PM_{10}$ and $PM_{2.5}$ were 96.5% and 97.3%, while those of organic anions ($HCOO^-$ and $CH_3COO^-$) in each fraction were 2.9% and 2.0%, respectively. On the other hand, the neutralizing capacity of $PM_{10}$ and $PM_{2.5}$ by $NH_3$ were 72.8% and 82.3%, while their $CaCO_3$ counter parts were 22.5% and 13.3%, respectively.

• 동아시아식생활학회지
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• 제26권2호
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• pp.109-116
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• 2016

The purposes of this study were to analyze the antioxidative effects and antimicrobial activity of Omija. Total phenol contents of Omija extracted with ethanol and water were $53.4{\pm}2.2tannic\;acid\;equivalent/mg$, and $47.9{\pm}2.1tannic\;acid\; equivalent/mg$, respectively. Total flavonoid contents of Omija extracted with ethanol and water were $16.3{\pm}1.1naringin\;equivalent/mg$, and $13.1{\pm}1.4naringin\;equivalent/mg$, respectively. Electron donating ability of ethanol extract ($1,000{\mu}g/mL$) of Omija was $5.1{\pm}0.4%$. This result was lower than the antioxidant vitamin (ascorbic acid: $96.4{\pm}0.6%$) and artificial antioxidant BHT ($70.0{\pm}0.5%$). Nitrite-scavenging abilities of Omija were lower than ascorbic acid and BHT. SOD-like activities of Omija extracts, natural antioxidant, and artificial antioxidant at 5 mg/mL were in the other of ascorbic acid ($99.0{\pm}0.5%$) > BHT ($72.6{\pm}0.5%$) > ethanol extract ($16.3{\pm}0.4%$) > water extract ($14.4{\pm}0.3%$). The order of OH radical scavenging activities of Omija extracts and natural antioxidant at 5 mg/mL was ascorbic acid ($98.9{\pm}0.6%$) > tocopherol ($85.4{\pm}0.6%$) > water extract ($59.1{\pm}0.5%$) > ethanol extract ($33.1{\pm}0.3%$). The results show that the antimicrobial effects of Omija could not be detected at both concentrations and extraction methods.

• 한국환경생태학회지
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• 제31권1호
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• pp.24-29
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• 2017

본 연구는 2012년부터 2014년까지의 번식기 동안 광주광역시에서 제비의 영소지 선택과 번식생태를 파악하기 위하여 이루어졌다. 모든 둥지는 건물의 수직 벽과 지붕에 붙어 있었으며, 둥지의 외측 직경은 $18.2{\pm}3.2cm$, 깊이는 $9.8{\pm}3.1cm$, 둥지 내측 직경은 $11.2{\pm}1.5cm$, 내측 깊이는 $3.4{\pm}0.5cm$로 지면에서 평균 $2.9{\pm}0.3m$ 높이에 위치하였다. 번식 둥지는 시멘트 벽(44.9%), 목재(23.1%), 벽돌(21.8%), 전등(6.4%)에 부착되어 있었다. 한배 산란수는 2~5개 범위로 평균 4.5개이었다. 평균 알 장경은 $18.23{\pm}0.73mm$, 단경은 $13.11{\pm}0.25mm$, 알 부피는 $1.60{\pm}0.11cm^3$, 알 형태지수는 $1.39{\pm}0.05$, 알 무게는 $1.69{\pm}0.15g$이었다. 부화 및 이소 성공률은 각각 89.1%와 84.5%이었다. 번식 실패의 주요 원인은 미수정란과 포식, 둥지훼손, 번식포기로 나타났다. 이러한 결과들은 제비의 서식지 보존 및 종 관리에 필요한 자료로 널리 활용될 것이라 판단된다.

• 자원ㆍ환경경제연구
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• 제26권3호
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• pp.417-449
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• 2017

본 연구는 한국노동연구원에서 제공하는 한국노동패널조사(KLIPS) 자료와 환경부 국립환경과학원이 제공하는 미세먼지 정보를 이용하여, 미세먼지가 개인의 주관적인 만족도에 미치는 효과를 분석하고 미세먼지 저감에 따른 사람들의 WTP를 추정했다. 패널 확률효과 순서형로짓을 이용한 추정 결과에 따르면, 첫째, 미세먼지 농도의 상승은 사람들의 주관적 삶의 만족도 확률을 낮추는 음의 값을 보였다. $PM_{10}\;1{\mu}g/m^3$ 증가는 각각 0.042%p~0.091%p까지 '만족'을 선택할 확률을 낮추게 했고, $PM_{2.5}\;1{\mu}g/m^3$ 증가는 각각 0.034%p~0.153%p까지 '만족'을 선택할 확률을 낮췄다. 소득의 경우, 가구당 연간 소득 1% 증가는 '만족' 선택할 확률을 0.16%p~0.18%p까지 높게 했다. 둘째, 대기 질 개선 비용을 산정하기 위해서 미세먼지 저감에 대한 WTP를 도출했다. $PM_{10}$ 1단위 개선하기 위한 사람들의 WTP는 108,787($96)~209,519($186)원 정도 도출되었고, $PM_{2.5}$의 WTP는 89,345($79)~362,930($322)원 정도 산출됐다. 이 금액은 한국인 가구 평균 연간 소득의 0.26%~0.50%와 0.22%~0.88%에 해당한다.

• 한국환경보건학회지
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• 제30권2호
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• pp.140-148
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• 2004

To evaluate the acute effects of fine particles on pulmonary function, a longitudinal study was conducted. This study was carried out for the schoolchildren (3rd and 6th grades) living in Beijing, China. Each child was provided with a mini-Wright peak flow meter and a preformatted health symptom diary for 40 days, and was trained on their proper use. Participants were instructed to perform the peak flow test three times in standing position, three times a day (9 am, 12 pm, and 8 pm), and to record all the readings along with the symptoms (cold, cough, and asthmatic symptoms) experienced on that day. Daily measurement of fine particles (PM$_{10}$ and PM$_{2.5}$) was obtained in the comer of the playground of the participating elementary school for the same period of this longitudinal study. The relationship between daily peak expiratory flow rate (PEFR) and fine particle levels was analyzed using a mixed linear regression models including gender, height, the presence of respiratory symptoms, and daily average temperature and relative humidity as extraneous variables. The total number of students participating in this longitudinal study was 87. The range of daily measured PEFR was 253-501$\ell$/min. In general, the PEFR measured in the morning was lower than the PEFR measured in the evening (or afternoon) on the same day. The daily mean concentrations of PM$_{10}$ and PM$_{2.5}$ over the study period were 180.2$\mu\textrm{g}$/㎥ and 103.2$\mu\textrm{g}$/㎥, respectively. The IQR (inter-quartile range) of PM$_{10}$ and PM$_{2.5}$ were 91.8$\mu\textrm{g}$/㎥ and 58.0$\mu\textrm{g}$/㎥. During the study period, the national ambient air quality standard of 150$\mu\textrm{g}$/㎥ (for PM$_{10}$) was exceeded in 23 days (57.5%). The analysis showed that an increase of 1$\mu\textrm{g}$/㎥ of PM$_{10}$ corresponded to 0.59$\mu\textrm{g}$/㎥ increment of PM$_{2.5}$. Daily mean PEFR was regressed with the 24-hour average PM$_{10}$ (or PM$_{2.5}$) levels, weather information such as air temperature and relative humidity, and individual characteristics including gender, height, and respiratory symptoms. The analysis showed that the increase of fine particle concentrations was negatively associated with the variability in PEFR. The IQR increments of PM$_{10}$ or PM$_{2.5}$ (at 1-day time lag) were also shown to be related with 1.54 $\ell$/min (95% Confidence intervals: 0.94-2.14) and 1.56$\ell$/min (95% CI: 0.95-2.16) decline in PEFR.R.ine in PEFR.ine in PEFR.

• 한국식품영양학회지
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• 제19권1호
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• pp.70-78
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• 2006

본 연구는 $35{\sim}55$세 중년 여성을 대상으로 운동과 식사요법을 중심으로 12주간 체중 조절 프로그램을 실시한 후 대상자들의 비만도 및 혈액 지질 개선 효과, 식습관 변화에 미치는 영향을 조사하였고 그 결과는 다음과 같다. 1. 12주간의 체중 조절 프로그램 실시로 체중, 체지방량, 체지방률, BMI, 비만도 모두 유의성은 없었지만 감소되었다. 체중은 $67.4{\pm}10.8kg$에서 $65.1{\pm}9.2kg$으로, 체지방량은 $27.6{\pm}6.9kg$에서 $26.7{\pm}7.5kg$으로 프로그램 실시전과 비교하여 0.9 kg 정도 감소되었다. 체지방률(%)도 $40.6{\pm}5.2%$에서 $39.6{\pm}5.1%$로 감소되었으며 제지방량(FFM)도 $39.9{\pm}5.6kg$에서 $37.0{\pm}8.5kg$으로 감소를 보였다. 2. 대상자들의 비만도 (Obesity degree, %)와 체질량지수 (BMI)는 프로그램 실시 전 각각 $128.4{\pm}19.1%,\;27.8{\pm}3.9$에서 프로그램 실시 후 $123.4{\pm}15.7%,\;26.8{\pm}3.0$로 감소하였다. 복부 비만도(WHR)도 프로그램 실시 전과 후 각각 $0.98{\pm}0.16$에서 $0.94{\pm}0.04$로 변화되었다. 3. 체중조절 프로그램 실시 전후 혈압, 공복시 포도당, 중성지방, 콜레스테롤 농도 모두 뚜렷한 변화는 없었지만 수축기 혈압이 $119.19{\pm}17.03mmHg$에서 $114.55{\pm}17.86mmHg$으로 감소되었고, 총 콜레스테롤은 $179.35{\pm}34.46mg/dL$에서 $173.45{\pm}38.88mg/dL$로, 중성지방은 $174.71{\pm}91.33mg/dL$에서 $167.44{\pm}47.31mg/dL$로 유의성은 없었지만 모두 감소한 반면, 동맥경화 억제요인인 HDL-콜레스테롤 농도는 $43.06{\pm}14.05mg/dL$에서 $50.38{\pm}16.47mg/dL$로 증가되었다. 4. 대상자들의 식습관 분석 결과 영양교육 실시 전 18.7점에서 실시 후 20.8점으로 증가하였으며 특히 가장 점수가 낮았던 ${\ulcorner}$만복감${\lrcorner}$과 ${\ulcorner}$식품의 배합${\lrcorner}$ 항목에서 개선되었고, 그외 ${\ulcorner}$음식의 간을 싱겁게${\lrcorner}$와 ${\ulcorner}$채소섭취${\lrcorner}$ 항목도 영양교육 실시로 인해 크게 개선되었다. 5. 식사 일기 기록을 통한 영양소 섭취 분석 결과 1일 총 열량 섭취량은 $30{\sim}49$세 경우 프로그램 실시 전 $1,774.7{\pm}486.1kcal$에서 실시후 $1,189.1{\pm}310.5kcal$로 낮아졌으며, 50세 이상에서도 프로그램 실시 전과 후 각각 $1,549.4{\pm}327.1kcal,\;1,371.4{\pm}221.0kcal$로 감소하였다. 1일 단백질 섭취량을 비롯하여 지방, 칼슘, 철분, 비타민 C의 섭취량도 열량 섭취량 감소에 따라서 섭취 권장량 이하로 감소되었다.

• 재활복지공학회논문지
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• 제10권4호
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• pp.273-278
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• 2016

청각선별에서 반응 역치는 검사 환경 잡음, 청각기관 생리적 특성, 과도한 음원 노출 등에 따라 다르게 나타난다. 이 연구 목적은 청각선별을 통과한 소아의 주파수별 가청역치에 대한 정보를 획득하는데 있다. 연구 대상은 언어치료센터와 지역아동센터에 다니는 3.3세부터 16.3세($9.01{\pm}2.52$) 사이의 110명으로 하였고, 이들의 소아 청각 선별 결과를 후향적으로 분석하였다. 청각선별은 고막운동성계측(Tympanometry), 등골근반사(acoustic reflex threshold), 자동화 이음향방사(automated otoacoustic emission), 순음청각선별(pure tone screening)을 시행하였다. 대상자들은 모두 청각선별 정상 기준에 포함되었다. 주파수별 가청역치 차이는 반복측정 분산분석 하였다. 결과: 가청역치 평균은 500, 1,000, 2,000, 4,000 Hz의 순서로 우측 귀 $16{\pm}6.49$, $11.5{\pm}4.79$, $6.86{\pm}4.99$, $5.95{\pm}6.65$ dB HL, 좌측 귀 $15.68{\pm}6.01$, $9.95{\pm}5.24$, $5.72{\pm}5.21$, $5.63{\pm}7.04$ dB HL로 각각 관찰되었다. 주파수 사이에는 500Hz와 1,000, 2,000, 4,000 Hz(p=.000), 1,000과 2,000, 4,000 Hz(p=.000)로 유의한 차이가 있었다.

• 산업보건소식
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• 제48호
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• pp.9-18
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• 1987

The results of this study which had been investigated to analyse heavy metal levels and to compare lead, cadmium, copper and zinc concentration in urine of children who lived around the industrial area and the agricultural area. Samples were collected and analyzed from September to December 1986 from 7-9 years old children living in Seoul (4 7 cases), lri ( 64 cases) industrial area and Chinan (56 cases) agricultural area. The summarized results were as follows: 1) The concentrations of lead were Seoul 28.7 $\pm$17.7 ug/l, lri 25.3 $\pm$7.5 ug/l and Chinan 19.3 $\pm$5.2 ug/l 2) The concentrations of cadmium were Seoul 1.5 $\pm$0.8 ug/l, Iri 1.4 $\pm$0.5 ug/l and chinan 0.9 $\pm$0.3 ug/l 3) The concentrations of copper were Seoul 12.8 $\pm$7.0 ug/l, Iri 10.5 $\pm$8.4 ug/l and Chinan 10.0 $\pm$4.5 ug/l 4) The concentrations of zinc were Seoul 383 $\pm$279 ug/l, Iri 329 $\pm$133 ug/l and Chinan 267 $\pm$181 ug/l 5) In lead, cadmium and zinc concentration of children, there were statistical difference between the industrial area and the agricultural area 6) There were no indicated significantly levels by the Sex

• Journal of Ginseng Research
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• 제20권3호
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• pp.339-343
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• 1996

The effect of ginseng on the reactivity of penile corpus cavernosal smooth muscle strips of rabbits was investigated to support the clinical application of ginseng for the treatment of erectile dysfunction. New Zealand white rabbits were randomly divided into two groups, normal diet group (n=9) and ginseng saponin diet group (n=5). Then, each group was fed normal diet and Korean red ginseng saponin diet (50 mg/kg/day) for 10 weeks. We measured concentration dependent relaxation of corporal smooth muscle to acetylcholine (10-8 M to 10-4M) in organ chamber. The degree of relaxation was expressed as percentage of maximal relaxation obtained by papaverine (10-4M). Dose dependent relaxation of corpus cavernosal smooth muscle to acetylcholine, at the concentration of 10-8 M to 10-4M by half log increment, was 4.06$\pm$0.00, 4.30$\pm$1.30, 5.32$\pm$0.68, 11.64$\pm$1.74, 16.24$\pm$1.61, 23.33$\pm$ 2.29, 26.45$\pm$2.25, 30.43$\pm$2.40 and 33.41 $\pm$2.48 (%), respectively in normal diet group and 9. 83$\pm$4.15, 20.60$\pm$4.62, 24.1815.12, 35.75$\pm$5.71, 43.35$\pm$6.11, 51.30$\pm$6.22, 56.33$\pm$6.22, 54.30$\pm$4.17 and 51.98$\pm$3.92 (Vc), respectively in ginseng group. These data suggest that ginseng enhances ondothelium-dependent acetylcholine-induced relaxation of penile corpus cal.ernosal smooth muscle in rabbits.

• Journal of Preventive Medicine and Public Health
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• 제56권5호
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• pp.449-457
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• 2023

Objectives: This study investigated the association between baseline exposures to particulate matter with a diameter <2.5 microns (PM_2.5) and subsequent temporal changes in PM_2.5 exposure with the incidence of type 2 diabetes among Royal Thai Army personnel. Methods: A retrospective cohort study was conducted using nationwide health check-up data from 21 325 Thai Army personnel between 2018 and 2021. Multilevel mixed-effects parametric survival statistics were utilized to analyze the relationship between baseline (i.e., PM_2.5-baseline) and subsequent changes (i.e., PM_2.5-change) in PM_2.5 exposure and the occurrence of type 2 diabetes. Hazard ratios (HRs) and 95% confidence intervals (CIs) were employed to assess this association while considering covariates. Results: There was a significant association between both PM_2.5 baseline and PM_2.5-change and the incidence of type 2 diabetes in a dose-response manner. Compared to quartile 1, the HRs for quartiles 2 to 4 of PM_2.5-baseline were 1.11 (95% CI, 0.74 to 1.65), 1.51 (95% CI, 1.00 to 2.28), and 1.77 (95% CI, 1.07 to 2.93), respectively. Similarly, the HRs for quartiles 2 to 4 of PM_2.5-change were 1.41 (95% CI, 1.14 to 1.75), 1.43 (95% CI, 1.13 to 1.81) and 2.40 (95% CI, 1.84 to 3.14), respectively. Conclusions: Our findings contribute to existing evidence regarding the association between short-term and long-term exposure to PM_2.5 and the incidence of diabetes among personnel in the Royal Thai Army.