비모수검정을 이용한 논침투수 수질의 평가

오승영,김진수,오광영,Oh, Seung-Young,Kim, Jin-Soo,Oh, Kwang-Young 한국농공학회 2005 한국농공학회논문집 Vol.47 No.2

Characteristics of concentrations of total nitrogen (TN), total phosphorus (TP), and chemical oxygen demand (COD) pollutant in percolated water at four paddy field sites (Soro, Odong, Munui, and Boeun) were investigated by a nonparametric test. Percolation rate measurement and percolated water sampling were taken during irrigation periods at $5{\sim}10$ day intervals. The normality of percolation rate and pollutant concentrations were examined using histogram, boxplot, and the Kolmogorov-Smirnov (K-S) test. Pollutant concentrations in percolated water showed positively skewed distribution. The median concentrations of pollutant were 1.91 mg/L for TN, 0.021 mg/L for TP, and 6.6 mg/L for COD, which were lower than its arithmetic mean concentrations by $35\%$ for TN, $36\%$ for TP, and $13\%$ for COD. The median concentrations of TN and TP differed significantly among sample sites according to the Kruskal-Wallis test. However, median concentrations were not significantly different among month except for TN and TP of Soro and COD of Odong. The percolation load of pollutants during irrigation periods in the study area were estimated at $3.12{\sim}7.75\;kg/ha$ for TN, $0.033{\sim}0.155\;kg/ha$ for TP, and 10.7 kg/ha for COD, which were much lower than respective values reported in Japan.

오염총량관리 할당부하량 초과지역의 최종 평가기준에 관한 연구

오승영 ( Seung Young Oh ),한미덕 ( Mideok Han ),김석규 ( Seok Gyu Kim ),안기홍 ( Ki Hong Ahn ),김옥선 ( Oksun Kim ),김용석 ( Yong Seok Kim ),박지형 ( Ji Hyoung Park ) 한국물환경학회(구 한국수질보전학회) 2016 한국물환경학회지 Vol.32 No.5

The Total Maximum Daily Load (TMDL) is a watershed management system that involves the establishment of the target water quality, the calculation of permission loading (allocation loading), and the control of total pollutants for each unit watershed. Allocation loading is assessed through the comprehensive implementation assessment of the previous year`s plan. Assessment results are used for follow-up management measures such as the limit of development and updating of TMDL Management Implementation Plans for the next planning period. Although detailed assessment criteria are important, they are not currently available. Therefore, we suggested assessment criteria by comparing two methods(‘integration method` and ‘separation method`) using combination point and non-point discharge loading. We also examined the penalty criteria considering controllable load local government and updating methods of the TMDL Management Implementation Plan for the next planning period.

관개기 광역논에서의 오염물질의 수지

오승영 ( Oh Seung Young ),김진수 ( Kim Jin Soo ),김규성 ( Kim Kyu Sung ) 한국농공학회 2000 한국농공학회 학술대회초록집 Vol.2000 No.-

Concentration of pollutants and discharge were monitored regularly at paddy field area during irrigation periods. The amounts of irrigation water during irrigation water during irrigation periods in 1999 were 3690mm. The concentration of pollutants in ponded water are high during fertilizer application period. The ratio of discharge of direct runoff Q_D to the total runoff is 9%. The ratios of the load of direct runoff L_D to the total load L_T are 6% for T-N, 16% for T-P and 16% for COD. It was found that the ratios of the concentration are 0.7 for T-N, 1.8 for T-P and 1.9 for COD. The unit load of T-N, T-P and COD during irrigation periods were 12.1kg/㏊, 0.42kg/㏊ and 85.7kg/㏊, respectively

다발성 손상 환자에서의 복부 손상에 대한 비수술적 치료: 권역 외상 센터가 아닌 3차 병원의 치료 경험(2009~2014)

오승영 ( Seung Young Oh ),서길준 ( Gil Joon Suh ) 대한외상학회 2015 大韓外傷學會誌 Vol.28 No.4

The aim of this study is to present a nonoperative treatment for abdominal injuries in patients with multiple traumas and to discuss the role of metropolitan tertiary hospital, non-regional trauma centers. We collected data from patients with multiple traumas including abdominal injuries from 2009 to 2014. Patient characteristics, associated injuries, short-term outcomes and departments that managed the patients overall were analyzed. Based on treatment modalities for abdominal injury, patients were divided into two groups: the operative treatment group and the nonoperative treatment group. We compared differences in patient characteristics, injury mechanisms, initial vital signs, detailed injury types, lengths of hospital and ICU stays. Of the 167 patients with multiple traumas, abdominal injuries were found in 57 patients. The injury mechanism for 44 patients (77.2%) was traffic accidents, and associated extra-abdominal injuries were shown in 45 patients (78.9%). The mean lengths of hospital and ICU stays for the 57 patients were 36.4 days and 8.3 days, respectively. The in-hospital mortality rate was 8.8%. Ten patients (17.5%) were treated operatively, and 47 patients (82.5%) were treated nonoperatively. Among the 47 patients in the nonoperative treatment group, 17 patients received embolization, and 3 patients underwent a percutaneous drainage procedure. Operative treatments were used more in patients with injuries to the pancreas and bowel. No patient required additional surgery or died due to the failure of nonoperative treatment. No differences in the clinical characteristics except for the detailed injury type were observed between the two groups. In appropriately selected patients with multiple traumas including abdominal injuries, nonoperative treatment is a safe and feasible. For rapid and accurate managements of these patients, well-trained trauma surgeons who can manage problems with the various systems in the human body and who can decide whether nonoperative treatment is appro-priate or not are required. [ J Trauma Inj 2015; 28: 284-291 ]

관개기 대구획 광역논에서의 오염부하 원단위

오승영 ( Oh Seung Young ),김진수 ( Kim Jin Soo ),김규성 ( Kim Kyu Seong ),김선종 ( Kim Seon Jong ),윤춘경 ( Yoon Chun Gyeong ) 한국농공학회 2002 韓國農工學會誌 : 전원과 자원 Vol.44 No.2

Characteristics of unit loads of pollutants were investigated at a paddy fields area(Soro-ri) with large-scaled plots on loam soil during irrigation seasons of 1999 ∼2000. The average irrigation requirement of experimental paddy area are estimated at over 3,000 mm. The unit loads of pollutants in paddy fields area are determined by subtracting irrigation water load from outflow load (percolated and surface outflow loads). Surface outflow load in rainy days was calculated using the relationships of discharge and load, which are grouped into fertilizing and non-fertilizing periods. The ratios of the surface outflow load in rainy days to the total surface outflow load are 16.4% for T-N, 26.8% for T-P, and 23.3% far COD_cr. The unit loads of pollutants show month-to-month and year-to-year variations, and monthly unit load of pollutants can show negative values, indicating that the paddy area acts as the pollutants sink. The average unit loads of the pollutants during irrigation seasons were estimated at 18.2 kg/ha fur T-N, 0.31 kg/ha for T-P, and 43.3 kg/ha for COD_cr, which are smaller than the reported values for Kosei area in Japan.

광역논에서의 영양 물질(N, P)의 거동 특성

오승영 ( Oh Seung Young ),김진수 ( Kim Jin Soo ),정구영 ( Jung Gu Young ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-

Nutrients behavior were investigated at a paddy fields area(50ro-ri) with large-scaled plots on loam soil during irrigation seasons of 2001~2002. The average concentration of TN, TON and TOP in drainage water was higher than that in irrigation water. On the other hand, TP in irrigation water was higher than that in drainage water. The ratio of a TON to TN accounts for over 90% and the ratio of TOP to TP accounts for 50~70%. Especially, the ratio of TOP to TP in drainage water was bigger than that in irrigation water, suggesting that much of particulate component was reduced due to sedimentation and adsorption in paddy fields plots.

강우시 광역논으로부터의 유출부하 특성

오승영 ( Oh Seung Young ),김진수 ( Kim Jin Soo ),이종진 ( Lee Jong Jin ),오광영 ( Oh Kwang Young ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-

Concentration and discharge have been intensively monitored at the drainage canal in a paddy field area during storm-periods. Among 4 storm runoffs, the No. 2 and No. 3 runoff was in the fertilizer application period. The specific load-specific discharge equation L = aQ^b have different characteristics for the pollutants. The coefficient of b generally shows values of more than 1 for T-N, about 1 for COD_cr and less than 1 for T-P. For same specific discharge, No. 2 runoff shows higher specific load than other runoffs. For the coefficient of determination of the L-Q equation, COD_cr, is higher than T-N and T-P. The mean concentration of direct runoff, significantly depending on the storm events, is 0.6 to 8.3 mg/l for T-N, 0.05 to 0.51 mg/l for T-P, and 10.0 to 18.3 mg/I for COD_cr.

관개기 대구획 광역논에서의 수질정화기능 평가

오승영 ( Oh Seung-young ),김진수 ( Kim Jin-soo ),정구영 ( Jung Gu-young ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-

본 논문에서는 1999~2003년의 관개기(4월 중순~9월 하순) 동안 대구획 광역논을 대상으로 논의 수질 정화 기능을 평가하고 영양물질의 유출부하 저감 방안을 제시하였다. 1. 심층 침투수의 TP 평균농도는 0.027 mg/L로 용수와 배수에 비해 매우 작게 나타났다. 이는 지하로 침투하면서 상당량 토양에 흡착되었기 때문으로 사료된다. 2. 순유출부하량이 양(+)인 경우에 논은 배출형(오염원), 음(-)인 경우에 논은 흡수형(정화형)을 나타내는데, 월별 순유출부하량은 6월에 많은 용수량 중간낙수, 장마기 강우 등의 영향으로 가장 높은 값을 나타냈다. 3. 본 연구에서 지표유출량과 순순유출부하량은 양의 상관관계를 보였고 TN은 지표유출량이 422 mm/월 이상, TP는 지표유출량이 약 610 mm/월 이상일 때 순유출부하량은 양(+)이 되는 것으로 나타났다. 4. 본 유역과 국외 논유역에서 측정된 영양물질의 순유출부하량은 강우량의 증가와 함께 증가하는 것으로 나타났다. 관개기간 중 강수량이 TN은 840 mm, TP는 1,130 mm이상일 때 논은 배출형으로 될 가능성이 크게 나타났고, 논에서의 수질정화 기능은 질소보다는 인이 뛰어난 것으로 나타났으며 배수 억제와 같은 물관리를 통하여 논에서의 유출부하를 저감시킬 필요성이 있다. Net outflow flux and unit load of pollutants were investigated at a paddy fields area(Soro-ri) with large-scaled plots on loam soil during irrigation seasons of 1999~2003. Water samples were collected, and inflow and outflow were measured at 5~10day intervals during non-storm periods and at 2~6 hours intervals during storm events. The average concentration of TP in percolated water was much smaller than that in irrigation and surface outflow water likely due to phosphorus absorption capacity of paddy soils. Net outflow flux in study area was significantly correlated with rainfall and surface outflow discharge. Nutrient flux from paddy fields can be abated by reduction in outflow surface discharge.

수질오염총량관리 제도개선 성과

오승영 ( Seung Young Oh ),박준대 ( Jun Dae Park ),이수웅 ( Su Woong Lee ),류덕희 ( Doug Hee Rhew ) 한국물환경학회 2009 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2009 No.-

갈수년 광역논에서의 오염부하의 유출 특성

오승영 ( Oh Seung Young ),김진수 ( Kim Jin Soo ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-

We investigated net outflow load and unit load of pollutants from a paddy fields area in dry year 2001. Amount of irrigation water in 2001 was about 61-63% of that in previous years 1999 and 2000 due to drought. The net outflow load and unit load of pollutants in 2001 were negative, showing that paddy fields acts as sink of pollutants due to function of water quality purification. The relationship between unit load of pollutants and net surface outflow (= surface outflow - irrigation water) showed positive correlation. The results showed that abatement of surface outflow by appropriate water management contribute to reduce surface outflow load from paddy fields.