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동북아 오염물질 장거리이동 분석을 위한 서울시 대기 중 라돈농도의 시계열적 특성에 관한 연구
김윤신,이철민,김기연,전형진,김종철,Kim, Yoon-Shin,Lee, Cheol-Min,Kim, Ki-Youn,Jeon, Hyung-Jin,Kim, Jong-Cheol,Iida, Takao 한국환경보건학회 2007 한국환경보건학회지 Vol.33 No.4
Atmospheric concentrations of radon had been continuously observed in Seoul, Korea since December 1999, as a tracer for long-range transport of air pollutants from China continent to Korea. In order to study radon as a tracer of long-range transport, it is important to know information about the atmospheric distribution and variation of radon concentration and its time variation. Atmospheric radon concentration are measured with electrostatic radon monitor(ERM) at Hanyang University located in Eastern area of Seoul. Air sample is taken into a vessel of ERM, and alpha particles emitted by radon daughters $Po^{218}$ are detected with ZnS(Ag) scintillation counter. Hourly mean concentrations and hourly alpha counts are recorded automatically. The major results obtained from time series observation of atmospheric radon were as follows : (1) The mean of airborne radon concentration in Seoul was found to be $7.62{\pm}4.11\;Bq/m^3$ during December $1999{\sim}January$ 2002. (2) The hourly variation of radon concentrations showed the highest in 8:00AM ($8.66{\pm}4.22\;Bq/m^3$) and the lowest in 3:00AM ($6.62{\pm}3.70\;Bq/m^3$) and 5:00AM ($6.62{\pm}3.39\;Bq/m^3$). (3) the seasonal variation of radon concentrations showed higher during winter-to-fall and lower during summer-to-spring. (4) Correlation between airborne radon concentration and the meteorological factors were -0.21 for temperature, 0.09 for humidity, -0.20 for wind speed, and 0.04 for pressure. (5) The mean difference of airborne radon concentration between Asian dust ($5.36{\pm}1.28\;Bq/m^3$) and non-Asian dust ($4.95{\pm}1.49\;Bq/m^3$) phenomenon was significant (p=0.08). We could identify time series distribution of radon concentration related meteorological factors. In addition, radon can be considered a good natural tracer of vertical dispersion and long-range transport.
김윤신,노영만,이철민,김기연,김종철,전형진,Kim, Yoon-Shin,Roh, Young-Man,Lee, Cheol-Min,Kim, Ki-Youn,Kim, Jong-Cheol,Jun, Hyung-Jin 한국환경보건학회 2007 한국환경보건학회지 Vol.33 No.1
The purpose of this study was to survey the distribution patterns of volatile organic compounds(VOCs) and formaldehyde in the various indoor environments using cluster analysis. We investigated VOCs and formaldehyde in subway stations, underground shopping areas, medical centers, maternity recuperation centers, public childcare centers, large stores, funeral houses, and indoor parking lots from June,2005 to May,2006. Concentration of TVOCs in maternity recuperations was 2,605.7 ${\mu}g/m^3$ that was higher than the guideline and other facilities. TVOCs in public childcare centers was 1,951.6 ${\mu}g/m^3$ also it exceeded the guideline. Moreover, concentration of TVOCs in every facility exceeded the guideline of Department of Environment, Korea. In case of formaldehyde, mean concentration, 336.5 ${\mu}g/m^3$, in only public childcare centers exceeded the 120 ${\mu}g/m^3$ of the guideline. Finally, by applying cluster analysis, three pattterns of the indoor air pollutions were distinguished. In the results of analysis, concentrations of TVOCs and formaldehyde of cluster 3 were higher than cluster 1 and 2 that were 2,561.4 ${\mu}g/m^3$ and 184.9 ${\mu}g/m^3$, respectively.
플라즈마 이온 방식의 공기정화기를 이용한 돈사내 공기오염물질 저감 효과
김윤신,김기연,조만수,고문석,고한종,정진원,오미석,윤백,김중호,Kim, Yoon-Shin,Kim, Ki-Youn,Cho, Man-Su,Ko, Moon-Suk,Ko, Han-Jong,Jung, Jin-Won,Oh, Mi-Seok,Youn, Baek,Kim, Jung-Ho 한국환경보건학회 2010 한국환경보건학회지 Vol.36 No.4
This field study was performed to evaluate the efficiency of a plasma ion-operated air cleaner in temporal reduction of airborne pollutants emitted from a pig housing facility. In the case of gaseous pollutants, the plasma ion air cleaner was not effective in reducing levels of ammonia, hydrogen sulfide, nitrogen dioxide, or sulfur dioxide (p>0.05). In the case of particulate pollutants, however, the air cleaner was effective in reducing levels of particulate matter ($PM_{2.5}$ and $PM_1$) by 79(${\pm}6.1$) and 78(${\pm}3.0$)%, respectively. Unlike the case of these fine particle fractions, the reduction of total suspended particles (TSP) and $PM_{10}$ following treatment was almost negligible. In the case of biological pollutants, the mean reduction efficiencies for airborne bacteria and fungi were relatively low at 22(${\pm}6.6$) and 25(${\pm}8.7$)%, respectively. Taken together, these results indicate that in terms of air pollutants released from this pig housing facility, the plasma ion air cleaner was primarily effective in reducing levels of $PM_{2.5}$ and $PM_1$.
고압 송전선로 주변에 위치한 초등학교 학생들의 극저주파 자기장 노출량 예측 모델에 관한 연구
김윤신,현연주,최성호,노영만,홍승철,Kim, Yoon-Shin,Hyun, Youn-Joo,Choi, Seong-Ho,Roh, Young-Man,Hong, Seung-Cheol 한국환경보건학회 2006 한국환경보건학회지 Vol.32 No.5
The objectives of this study were to evaluate personal exposure estimated using a time activity pattern and microenvironmental model. The study was carried out for 44 children attending a primary school nearby the lines (school A) and 125 children attending a school away from 154 kV power lines (school B). For children attending school A, the estimated personal level was a little weak correlated with the measured level($Pearson\;r\;=0.34{\sim}0.35$). For children attending school B, the correlation was very low ($Pearson\;r\;=\;0.09{\sim}0.16$) using the TW A Model II, otherwise, TWA Model II-I which considered the average residential MF level according to the distance from the power line and home explained $39{\sim}53%$ of the correlation in MF personal exposures. The estimated personal exposure level was very well represented by the measured exposure level using TWA Model II-2 which consisted on spot and 24 h stationary measurements at subject's home ($Pearson\;r\;=\;0.65{\sim}0.85$). In conclusion, personal magnetic field expsoure estimated using a TWA Model II-2 should be provided for a reasonable estimate of measured exposure in schoolchildren living near the power line.
고주파요법이 복부비만의 감소에 미치는 효과에 대한 연구
김남연 ( Nam Youn Kim ),김창숙 ( Chang Suk Kim ),김윤신 ( Yoon Shin Kim ) 한국미용학회 2008 한국미용학회지 Vol.14 No.3
Obesity in modern society lowers quality of life, it`s not a disease that can easily be cured, it`s harming health and life of citizens since it`s apt to recur. By relieving the point that electrodesiccation can manage within short period of time without pain recur which was known as the biggest disadvantage of belly management, the researcher recorded belly, its weight, and body fat toward women from 20~40 who don`t have any health problems and didn`t take any medicines from obesity clinic for studying effect of electrodesiccation over weight loss and reduction of belly. People with obesity have very solid ligation of adipose tissue and also have unnecessary water between solid adipose tissue. Body heating which is produced by electrodesiccation makes ligation of adipose tissue loose, has function of dissolving and burning water between it and accelerate burning of adipose tissue. Adipose tissue that`s dissolved and burned like that are discharged through sweat glands or urine. In order to observe the numerical value difference of body through perspective of belly obesity management, we decided to execute repeating measurement every week, electrodesiccation treatment were processed for twice a week for 6 weeks. With final measurement result after 6 weeks, we could see that body fat were reduced 2.78% in average, belly were reduced 4.23cm in average and weight were reduced 2.76kg in average. According to survey result about body satisfaction after end of obesity management, the result shows that 66.5% people got confidence and therefore I strongly recommend electrodesiccation for belly obesity management.
국내의 계사(鷄舍) 형태별 암모니아 및 황화수소 농도 특성에 관한 연구
김기연(Ki Youn Kim),고한종(Han Jong Ko),김현태(Hyeon Tae Kim),김대근(Dae Keun Kim),김윤신(Yoon-Shin Kim) 한국실내환경학회 2010 한국실내환경학회지 Vol.7 No.4
The purpose of this study is to estimate concentration and emission unit of ammonia and hydrogen sulfide released from domestic chicken buildings by field investigation. Mean concentrations of ammonia and hydrogen sulfide emitted from chicken buildings were 18.25(±4.78)ppm and 807.53(±526.17)ppb for caged layer house, 14.48(±4.13)ppm and 644.82(±312.48)ppb for broiler house, and 6.16(±2.02)ppm and 284.75(±232.08)ppb for layer house with manure belt, respectively. Mean emission coefficients of ammonia and hydrogen sulfide were 0.951(±0.131) g hen-1h-1 and 2.956(±0.968) mg hen-1h-1 based on head whereas they were 0.575(±0.082) g m-2h-1 and 12.44(±3.536) mg m-2h-1 based on time. In conclusion indoor concentration and emission coefficient of ammonia and hydrogen sulfide were highest in caged layer housed, followed by broiler house and layer house with manure belt.
김윤신(Yoon-Shin Kim),현연주(Youn-Joo Hyun),조용성(Yong-Sung Cho),최성호(Sung-Ho Choi),이규수(Kyu-Soo Lee),홍승철(Seung-Cheol Hong) 한국실내환경학회 2005 한국실내환경학회지 Vol.2 No.1
Electromagnetic fields of all frequencies represent one of the most common and fastest growing environmental influences, about which anxiety and speculation are spreading. All populations are now exposed to varying degrees of electromagnetic field, and the levels will continue to increase as technology advances. The objectives of this study were to measure and analyze emitting characteristics of extremely low frequency electromagnetic field at micro-environments. We measured magnetic field at microenvironments such as home, school, educational institute, internet pc game room for children attending the primary school. The range of time weighted average (TWA) of 60 ㎐ EMF in micro-environment were 0.26~7.62 mG and the highest TWA 7.62 mG was measured in PC room possessed more than 50 computers. We will measure personal exposure levels of primary students and analyze correlation between major micro-environments and personal exposure level.
전기제품 및 주거환경에서의 극저주파 영역 자기장 방출수준에 관한 조사
김윤신(Yoon Shin Kim),현연주(Youn Joo Hyun),이철민(Chul Min Lee),최성호(Sung Ho Choi),노영만(Young Man Roh),조용성(Yong Sung Cho),홍승철(Seung Cheol Hong) 한국실내환경학회 2006 한국실내환경학회지 Vol.3 No.1
In this paper, exposure levels of electromagnetic field were measured in residential environments and from appliances. First, the measurements of residential environments were taken in central locations in bedroom, living room, and kitchen in each home. Both arithmetic and geometric mean of normal-power condition are higher than low-power condition (all electrical devices turned off/unplugged), and the background fields in homes show a geometric mean of about 0.022 uT. Second, we measured broadband magnetic fields of domestic appliances at various distances. The highest magnetic field is 44.3 uT from the microwave oven, and the lowest is 1.4 uT from the Kimchi Refrigerator. The magnitude of magnetic fields from appliances dropped off at a rate inversely proportional to distance, but the ratio of drop-off on Korean appliances is lower than US and UK.
국내 다양한 실내환경에서 라돈농도 및 거주자의 실효선량 평가
이철민,김윤신,노영만,김기연,전형진,김종철,Lee, Cheol-Min,Kim, Yoon-Shin,Roh, Young-Man,Kim, Ki-Youn,Jeon, Hyung-Jin,Kim, Jong-Cheol 한국환경보건학회 2007 한국환경보건학회지 Vol.33 No.4
The objective of this study was to offer basic and scientific data for decision-making of policy for improvement and management of radon, natural radiation gas, in Korea and to form the foundation of radon related international cooperation. Therefore, this study collected and re-analysed the articles on exposure of radon in various indoor environment in journals related environment in Korea since 1980 and estimated the annual exposure dose and effective dose by exposure of radon received by inhabitants in them. The highest pooled average radon concentration of $50.17{\pm}4.08\;Bq/m^3$ (95% CI : $42.17{\sim}58.17\;Bq/m^3$) was found in dwelling house among various indoor environment. All of pooled average radon concentration estimated in this study showed lower than the guideline concentration ($148\;Bq/m^3)$ of US EPA and the Korean Ministry of Environment. The annual effective dose received by inhabitants in various indoor environment was estimated 1.071 mSv/yr. That is equal to annual effective dose (1.0 mSv/yr) by exposure of radon estimated by UNSCEAR.