新興 水源池의 富營養化 豫測

권우택 서울保健大學 1991 論文集 Vol.11 No.1

Enrichment of a water body by the input of organic material, nitrates and phosphates. This may happen naturally but is often a from of pollution. Eutrophication leads to an increase in the growth of aquatic plants and often to algal blooms. The algal growth produce toxins which kill fishes, or cause deoxygenation of the water In extreme causes this results in the death of most of the aquatic animals and higher plants. In this paper, the field survey was carried out to study in the Shin Hung reservoir once a month in the period of three months from March till May, 1990 the results could be summarized as follows. 1. The Shin Hung reservoir influent water was very polluted, during the survey period The average water temperature is 15.3℃ The average pH is 7.41 The average DO is 8.96㎎/l The average transparency is 1.31m The average T-P is 0.139㎎/l The average T-N is 4.41㎎/l The average Chl-a is 14.4㎎/㎥ 2. A simulation of the eutrophication of Shin Hung reservoir based on total phosphate load by carlson trophic state index in 1990; TSI(Chl)54.28, TSI(Sec) 50.46, TSI(T-P) 70.15, in 1995: TSI(Chl) 55.86, TSI(Sec) 51.71 TSI(T-P) 72.43 3. Preventing the eutrophication by aluminum sulfate and hypolimnetic aeration were reasonable method to restore the entrophic state of Shin Hung reservoir.

城南市 大氣浮遊粉塵中 呼吸性 粉塵에서 重金屬의 濃度 및 粒徑分布

권우택,유영식 대한위생학회 1994 대한환경위생공학회지 Vol.9 No.1

The heavy metal concentrations and particle size distribution are the most important parameters influencing to the human health. Airborne suspended particulate matters were collected on a glass fiber filter from April 1993 to February 1994 using high-volume air sampler, low-volume air sampler, Andersen sampler at Sungnam city. Six heavy metals were analyzed with atomic absorption spectrophotometry. The results could be summerized as follows : 1. The yearly average concentration of total suspended particulates collected by Andersen sampler was 116.3㎍/m³. The highest concentration was showed in spring(196.5㎍/m³) and the lowest concentration was showed in summer (72.9㎍/m³). 2. During spring the shape of the size distribution was trimodal which showed peaks at 3 size groups, which were below of 0.43㎛, 3.3~7.0㎛, and above of 11.0㎛. 3. During spring the ratio of coarse particles to the total particles was 69.9%, and during winter the ratio of fine particles to the total particles was 55.6%. 4. The concentrations of Zn(0.517㎍/m³), Pb(0.411㎍/m³), Cu(0.062㎍/m³), and Cd(0.0310㎍/m³) were the highest in the particles(<0.43㎛) and those of Fe(2.504㎍/m³) and Mn(0.095㎍/m³) were the highest in the particles(4.7~7.0㎛). 5. Mass median diameter of Cd, Zn, Pb and Cu were 0.6㎛, 1.0㎛, 1.1㎛ and 1.7㎛, respectively, Fe and Mn were 5.3㎛ and 3.8㎛, respectively. Those with MMD smaller than about 2㎛ are commonly associated with anthropogenic processes, in contrast, MMD greater than 2㎛ are emitted mainly by natural processes.

교통량에 따른 NOx의 농도와 O_(3)농도의 변화 추이

권우택,유영식 서울보건대학 1998 서울보건대학 부설 한국보건과학연구소 논문집 Vol.5 No.1

The rapid development of economic growth has brought about "Urbanization" in many areas and also raised the level of people' s life in many ways. At the same time, however, the industrialization and overpopulated districts in many areas have caused the problems of air pollution in necessary. So, the purpose of this study would be to analyze the changes of concentration of NOx. CO, HC and O_(3) on environmental air by traffic volume and from the side drive way to the degree of distance in Sungnam City, and recognize the citizens' consciousness to air pollution and suggest the best walking point in part. and plan to design the reasonable use of cars and finally make the air quality improve toward the betterment in part. From the research result we can know that people walking in the street would be protected from the hazardous air pollutant caused by the cars if they walk apart from a drive way as far as they can in the street. Accordingly, it might, to minimize the affect of air pollution. be thought to be desirable that the consideration of introduction the system that the vehicle using the diesel engine motor should use the centered-lane (With-Flow Medium Bus Lane or Contra-Flow Medium Bus Lane) aparted from the road. Another to be desirable is that along side the road, it might, to mininize the affect of O_(3), be recommended that apple tree, gingko tree were suitable to plant at urban street area.

황사현상시에 성남시에 포집한 분진한 입경분포 및 중금속 농도

권우택,유영식 서울보건대학 1996 서울보건대학 부설 한국보건과학연구소 논문집 Vol.3 No.1

The heavy metal concentrations and size distribution are the most important parameters influencing among the way in which airborne suspended particulate matters interact with the human respiratory system. Airborne suspended particulate matters were collected on a glass fiber filter from April to May 1996 using high-volume air sampler and Andersen sampler at Sungnam City. And those of Yellow Sand Phenomena period were investigated to find out the characteristics between normal and Yellow Sand Phenomena period. The results could be summerized as follows : 1. The Yellow Sand Phenomena period of TSP concentration was 264.7㎍/㎥ and normal period of TSP concentration was 117.5㎍/㎥. 2. The Yellow Sand Phenomena period ratio of PM-10 to TSP(PM-10/TSP) was 19.6% and normal period of PM-10 to TSP(PM-10/TSP) was 27.9%. 3. During the period of Yellow Sand Phenomena, the ratio of coarse particles to TSP was 70.7%. 4. The heavy metals were analyzed as follows showing in order of high concentration: Fe>Si> Na>Zn> Mn> Pb>Cu> Ni>Cd. 5. The mass median diameter(MMD) of Ni, Cd, Zn, Pb and Cu were 0.73, 1.07, 1.67, 1.77 and 1.79㎛, respectively, Na, Si, Fe and Mn were 2.66,4.87,5.12 and 5.84㎛, respectively. 6. Those with MMD smaller than about 2㎛ are commonly associated with anthropogenic processes, in contrast, MMD greater than 2㎛ are emitted mainly by natural processes.

교통량과 도로변 거리에 따른 환경대기 중의 NOx, CO 농도변화

권우택 서울保健大學 1997 論文集 Vol.17 No.1

In South Korea since 1970s the rapid development of economic growth has brought about "Urbanization" in many areas and also raised the level of people's life in many ways. At the same time, however, the industrialization and overpopulated districts in many areas have caused the problems of air pollution in necessary. Among those air pollution, in particular, in large cities has become more serious since 1990s than before. Air pollution, like TSP and SOx caused by heating, generation of electric power and industrialization in 1980s, showed as that of the type of an underdeveloping country and was not hazardous enough to people in the least. Unfortunately, in 1990s NOx. CO and O_(3) caused by the soaring numbers of many types of cars have exhausted air pollutant more hazardous as the same air pollution type of many developed countries. So, the purpose of this study would be to analyze the changes of concentration of NOx and CO on environmental air by traffic volume and from the side drive way to the degree of distance in Sungnam City, and recognize the citizens' consciousness to air pollution and suggest the best walking point in part, and plan to design the reasonable use of cars and finally make the air quality improve toward the betterment in part. From the research result we can know that people walking in the street would be protected from the hazardous air pollutant caused by the cars if they walk apart from a drive way as far as they can in the street. Accordingly, it might, to minimize the affect of air pollution, be thought to be desirable that the consideration of in introduction the system that the vehicle using the diesel engine motor should use the centered-lane aparted from the road. Another to be desirable is that along side the road, the trees inhaled the pollution should be planted

地下 商街室內外 및 地下鐵의 Formaldehyde 汚染度에 對한 硏究

권우택 서울保健大學 1992 論文集 Vol.12 No.1

Formaldehyde is an omniprisent pollutant in residential and non-industrial occupational environments. It is found in the combustion products of cigarette smoke and gas burning appliances, but its main sources are building materials and furnishings. Additionally, the current trend toward tighter, more energy efficient buildings with lower ventilation rates leads to increased concentrations of this and other pollutants generated indoors. In this paper, the field survey was carried out once a month to measure indoor and outdoor formaldehyde concentration from January to March, 1991, the results could be summarized as follows. 1. The mean formaldehyde concentrations were 0.119ppm in Jamshil underground shopping center of indoor, 0.107ppm in Jamshil underground shopping center of outdoor, 0.167ppm in Banpo underground shopping center of indoor, 0.132ppm in Banpo underground shopping center of outdoor, 0.082ppm in the No. 2 subway line (Jamshil~Pongchon), 0.095ppm in Yangjae underground shopping center of indoor, 0.093ppm in Yangjae underground shopping center of outdoor. 2. According to concentrations of sampling site, underground shopping center of indoor were higher than any other area. 3. Banpo underground shopping center of indoor and outdoor of formaldehyde concentrations exceed the American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE) Standard of 150㎍/m³(0.122ppm; 25℃, 760mmHg)

城南市 大氣浮遊粉塵 中 重金屬의 季節別, 粒徑別 特性

권우택,유영식,최한영 서울보건대학 1995 서울보건대학 부설 한국보건과학연구소 논문집 Vol.1 No.1

Sungnam city, as a major satellite town, is located in the southeast of Seoul. Atmospheric conditions are so stable that air pollutants from various emissions are tend to resist change because Sungnam city is located in the Namhansansung valley. The industrial distribution of Sungnam city are composed of various manufactories such as foods, fibers, chemicals, machinery and electronics, etc. The heavy metal concentrations and size distribution are the most important parameters influencing among the way in which respirable suspended particulate matter interact with the human respiratory system. Respirable suspended particulate matter was collected on glass fiber filters from April 1993 to February 1994 according to particle size using Andersen sampler during 10 days per month at Sungnam city. 6 heavy metals, Fe, Zn, Ph, Mn, Cu and Cd, were analyzed by particle size with atomic absorption spectrophotometry. The results could be summerized as follows: 1. The annual arithmetic mean concentration of total suspended particulates was 116.3㎍/㎥, seasonal variation was the highest in spring season096.5,ug/m') and the lowest in summer season(72.9 ㎍/㎥) 2. The ratio of airborne particulate concentrations respirable to nonrespirable(Res/NonRes) of annual arithmetic mean value was 5.8 : 1, seasonal variation was highest in the spring season(6.3 : 1) and lowest in the summer season(4.6 : 1). 3. During the spring season the shape of the size distribution was trimodal which showed peaks at 3 size groups, which were below of 0.43㎛, 3.3-4.7㎛, and above of 11.0㎛, respectively. 4. Respirable suspended particulate matter concentrations of Zn, Ph, Cu and Cd were the highest in below of 0.43㎛ as follows; 0.517㎛/㎥, 0.411㎛/㎥, 0.062㎛/㎥ and 0.0310㎛/㎥', respectively, Fe and Mn were the highest in the particle size range of 4.7-7.0㎛ as follows; 2.504㎛/㎥ and 0.095㎛/㎥, respectively. 5. The Ph, Cd, Zn, Cu, Fe and Mn concentrations of annual arithmetic mean value respirable to non- respirable(Res/Non- Res) were 33.65, 19.27, 17.74, 10.54, 3.20 and 5.20, respectively.

습식분쇄공정에서 액상매체가 실리콘 분쇄 및 산화특성에 미치는 영향

권우택,김수룡,김영희,이윤주,신동근,원지연,오세천,Kwon, Woo Teck,Kim, Soo Ryong,Kim, Young Hee,Lee, Yoon Joo,Shin, Dong Geun,Won, Ji Yeon,Oh, Sea Cheon 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.2

The influence of a liquid medium duringa wet-milling process in the grinding and oxidation of silicon powder was investigated. Distilled water, dehydrated ethanol and diethylene glycol were used as the liquid media. The applied grinding times were 0.5, 3, and 12 h. Ground silicon powder samples were characterized by means of aparticle size analysis, scanning electron microscopy(SEM), x-ray powder diffraction (XRD), FT-IR spectroscopy and by a chemical composition analysis. From the results of the characterization process, we found that diethylene glycol is the most efficient liquid medium when silicon powder is ground using a wet-milling process. The FT-IR results show that the Si-O band intensity in an unground silicon powder is quite strongbecause oxygen becomes incorporated with silicon to form $SiO_2$ in air. By applying deionized water as a liquid medium for the grinding of silicon, the $SiO_2$ content increased from 4.12% to 31.7%. However, in the cases of dehydrated ethanol and diethylene glycol, it was found that the $SiO_2$ contents after grinding only changed insignificantly, from 4.12% to 5.91% and 5.28%, respectively.

열적처리 : 폐플라스틱 고형연료의 시멘트열원 활용 연구

권우택,김병익,김수룡,황종희,김인섭,박관민 한국폐기물자원순환학회 2004 춘계학술연구발표회 Vol.2004 No.-

사람들의 건강권 확보를 위한 미세먼지 방지 안면마스크 여과효율 연구

권우택,정민재,김범수,이우식,권이승 한국냄새환경학회 2020 실내환경 및 냄새 학회지 Vol.19 No.2

In this study, we evaluated the filtering effect of the fine dust mask. Our objective research has secured credibility in the private sector. The performance of domestic fine dust masks is evaluated by three dust collection efficiencies, inspiratory resistance, and leakage rate according to KF grade in the health mask standard guidelines issued by the Ministry of Food and Drug Safety. Based on this, eight types of fine dust masks were evaluated for dust collection efficiency and face intake resistance. All masks showed good performance as the collection efficiency was 90%. The higher the KF grade, the higher the collection efficiency, but the inspiratory resistance had no correlation with the grade. According to the manufacturer's operation method, masks below the standard value may be distributed. Masks that are currently on the market have shown results that can be trusted. However, we hope that the system will be improved to validate whether the masks that meet the threshold are still being distributed.