신갈저수지 및 유입하천의 수질특성에 관한 연구

오종민,이수환 ( Jong Min Oh,Soo Hwan Lee ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.1

This study has been performed to investigate water quality and organic loading on Shingal reservoir and its tributries in order to collect basic data and to apply future hydrological and systemic water supply planning. Following results were obtaind, 1. The lower reaches of Shingal stream was more polluted than upper or middle reaches of a stream. Annual average BOD concentration of Site-4 which passed by Shingal Yub, was about 33.36㎎/1, and annual average COD concentration was 71.34㎎/1. The water quality of site-4 was worse than that of downstream(site-5), and proper measure is necessary to prevent water pollution. 2. For the vertical distribution of temperature in Shingal reservior, the stratification occurred in summer and winter, but not in spring and fall. 3. For the organic loading, domestic animals contributed most with 36% and residents contributed 34.1% of total BOD loading. 4. BOD loading estimation equation of Shingal reservoir was obtained from stepwise multiple regression analysis, and this equation was statistically significant(R²=0.7704, p$lt;0.001).

외국의 하천복원시리즈6 - 아라 강(황천 荒川)

오종민,Oh, Jong-Min 한국하천협회 2010 하천과 문화 Vol.6 No.4

중.소 도시하천의 물질수지를 통한 수질관리 방안 도출

오종민,신동환,최이송,Oh, Jong-Min,Shin, Dong-Hwan,Choi, I-Song 한국방재학회 2004 한국방재학회논문집 Vol.4 No.1

본 연구는 전형적인 도심소재 중 소하천인 오산천 상류를 중심으로 수질변화 현상을 정확히 파악하기 위하여 24시간에 걸친 연속측정을 통해 수질의 변화를 조사하였고, 이러한 결과를 통하여 효율적인 하천관리 방향을 제시하였다. 오산천 수질의 연속조사의 결과로부터, 본류의 수질개선을 위해서는 다음과 같은 일들이 선행되어야 할 것으로 판단된다. 첫째, 본류 수질개선을 위해서는 유입지류의 효율적인 관리방안이 필요하다. 둘째, 하천 본류의 저질로부터 재용출 되는 오염을 방지하기 위한 대처방안이 필요하다. 본 연구에서는 수질저하를 방지하기 위해 단순한 조사만으로도 중 소하천의 효과적인 관리 방안을 제시했다. 따라서 하천에서의 연속적인 수질 모니터링은 하천수질 개선을 위해 중요하며, 나아가 하천환경에서 일어나는 물질순환 및 물질수지는 건전한 하천조성을 위하여 정확히 평가되어야 한다. In this study, the variation of water quality in Osan stream was investigated through continuous monitoring, and mass balance and metabolism occurred into water body were estimated to set up effective management plan for water quality of small urban stream. From the results of continuos investigation of water quality in Osan stream, the things written as follows must be previously done to improve water quality of main stream. Firstly, it need that effective management plan for tributaries must be set up to improve the water quality in main stream. Secondly, the counter plan for re-eruption of pollutants from sediment in main-stream is required to prevent inner pollution. In this study, we showed that small urban stream can be managed effectively by simple investigation to prevent deterioration of water quality. Therefore continuous monitoring for water quality in stream is important to improve water quality, furthermore matter cycle and mass balance happening in the stream environment must be correctly estimated to make up healthy stream environment.

pH, 이온종류 및 농도, 퇴적물의 성분에 따른 하천 내 불소의 거동특성

이동민(Dong Min LEE),주광진(Kwang Jin Joo),최이송(ISong Choi),장광현(Kwang Hyeon Chang),오종민(Jong Min Oh) 응용생태공학회 2018 Ecology and resilient infrastructure Vol.5 No.1

하천에 유입된 오염물질은 다양한 환경 조건에 의하여 수체 및 퇴적물의 상호작용에 따라 수체의 수질에 영향을 미친다. 특히 최근 수체의 수리학적 체류시간이 상대적으로 긴 정체수역 내에서는 퇴적물의 축적량이 증가하고 있어 퇴적물과 수체 내에서의 물질적 거동특성 파악은 중요한 수질적 관점 요소이다. 본 연구에서는 하천 내 pH, 이온종류 및 농도, 퇴적물의 점토함량에 따라 불소의 거동이 어떻게 변화하는지 검토하기 위하여 경기도에 위치한 중소하천을 대상으로 조건별 실험을 실시하였다. pH에 따른 흡착 및 용출특성 실험결과, pH가 높을수록 불소의 흡착량이 감소하였고, 용출되는 불소량은 증가하는 경향을 나타냈다. 이온농도 및 종류에 따른 흡착 및 용출특성 실험결과, Cl<SUP>-</SUP>, SO₄<SUP>2-</SUP> 이온은 불소의 흡착능에 큰 영향을 주지 않는 것으로 나타났으나, 불소와의 활발한 이온경쟁효과를 지닌 OH<SUP>-</SUP>와의 반응에서는 흡착량이 줄고, 용출량이 늘었음을 알 수 있었다. 퇴적물의 성분에 따른 흡착 및 용출특성 실험 결과 상대적으로 입경이 작은 Silt와 Clay 성분이 많이 포함된 시료에서 불소의 흡착량이 많고 용출되는 불소량이 줄어드는 것을 알 수 있었다. 이는 수체의 환경조건이 퇴적물 내 불소의 흡착 및 용출에 크게 영향을 미치기 때문에, 퇴적물 내 불소를 적절하게 관리하기 위해서는 수체의 환경조건에 대한 이해가 선행되어야 한다는 것을 의미한다. Water quality is affected by the pollutants flowing into rivers since the interaction between water bodies and sediments in various environmental conditions. Especially, accumulation of sediments increases in the stagnant water areas due to a relative long hydrological retention time in the water bodies. Therefore, it is an important factor of water quality to understand characterization of the material behavior in water bodies and sediments. In this study, the objective of the conditional experiments was small and medium sized streams located in Gyeonggi-do. To estimate how the changes of fluoride behavior, depending on the pH, ion type, concentration, and clay contents. The pH results showed a trend that adsorption amount of fluorine decreased and the dissolution of fluorine increased following by pH increasing. The concentration and type of ions results showed that Cl<SUP>-</SUP> and SO₄<SUP>2-</SUP> ions had no significant effect on the adsorption ability of fluorine, the amount of dissolution was increased because OH<SUP>-</SUP> ion had active competition with fluorine in the reaction. The ingredient of sediment results showed that the amounts of fluoride adsorption and dissolution were reduced in samples, which contain relatively large amounts of Silt and Clay components. This means that the environmental conditions of water bodies greatly affect the adsorption and dissolution of fluoride in the sediments, so that proper management of fluoride in the sediments must precede an understanding of the environmental conditions of the water bodies.

오산천 상류 ( 신갈천 ) 의 오염원 저감을 위한 부하량 산정

오종민(Jong Min Oh),박재영(Jae Young Park),윤세철(Se Cheol Yoon) 한국수처리학회 1998 한국수처리학회지 Vol.6 No.2

This Study was performed to analyze the water quality from small urban stream and to restore the stream and the lake to the amenity environment by purifying urban stream. The amenity environment of the urban stream influences on ecosystem and the water quality of the lake. In this study sampling were set for the Shingal stream, the Jigok stream and the sewages which flow in the Shingal stream. The flux, pH, EC, concentration of DO, BOD, COD, NH₄-N, NO₂-N, NO₃-N, T-P, PO₄-P and Cl^- in stream were analyzed from April, 1995 to March, 1996. The results obtained from these investigations were as follows; The annual average pH was 7.63. Concentrations of SS, BOD, T-N and T-P were 10.6㎎/ℓ, 3.42㎎/ℓ, 8.58㎎/ℓ and 0.27㎎/ℓ at the upstream and 24.8㎎/ℓ, 16.64㎎/ℓ, 14.25㎎/ℓ and 0.88㎎/ℓ at the downstream, respectively. The pollutants loading investigated in Shingal stream were proved that SS, BOD, T-N and T-P were 922㎏/day, 620㎏/day, 525㎏/day and 33㎏/day, respectively. To improve the water quality of the Shingal stream and lake Shingal, we will construct wastewater treatment plant and use to methods of direct purification.

도시 소하천의 주중 주말 수질 및 오염부하량 특성

오종민(Jong Min Oh),김민호(Min Ho Kim) 한국수처리학회 1997 한국수처리학회지 Vol.5 No.1

The objective of this study was to examine stream characteristics of water quality and pollutant loading during weekdays and weekend. Water samples were collected in the Singal stream in Kyunggido. The water quality of the Singal stream was studied by the measurement of the parameters related to the trophic levels and pollutant loading. BOD, N and P concentrations was maintained at high level during the investigation period. At SG1 site which is located at the upstream, the daily fluctuations of trophic level parameters showed no characteristics during a day. However, the BOD concentrations during weekdays were higher than those on weekends. Compared to the BOD concentration changes, N and P concentrations showed no noticeable differences. The concentrations of BOD and N were increased in SG2 site where two sewage port were located. Especially, the BOD concentration during the weekend showed large daily fluctuations. From the TN/TP ratio monitored from May 1995 to April 1996, we conclude that nitrogen and phosphorus are the limiting factors in the Singal stream. Pollutant loading was higher in SG2 site, and showed a large deviation during a year. From these data, one-time measurement of water quality characterization is not suitable for urban sites. Water quality characterization of urban small stream should be represented by monitoring the concentration variations of weekday and weekend in the water sampling practice.

접촉산화법의 여재종류에 따른 처리효율의 비교

오종민(Jong Min Oh),최이송(I Song Choi),이태관(Tae Gwan Lee) 한국수처리학회 1996 한국수처리학회지 Vol.4 No.3

Direct-purification is a process that employs self-purification of stream to improve the water quality. The process is manageable economically and easily because it is based upon the characteristics of the stream. Therefore, the process employes the full characteristics of the stream and shows high efficiency of treatment. Due to the above advantages, the process has been studied extensively. This study was the treatment of stream conducted on the contact oxidation process. The contact oxidation process is one of the direct-purification process. The reactor was designed and made for this study. In the treatment, the removal efficiency was studied with the change of the media at constant HRT. The studied media were waste concrete, cement and gravel, sandbag, scrubber, waste plastic bottle, and gravel. The reactor was operated at 90 minutes of HRT to maintain the constant operation condition. BOD and SS were measured before and after the treatment. The decrease of BOD for gravel and scrubber media (76.9% and 73.5% respectively) showed higher than those of other media. The change of SS for gravel and scrubber media showed same tendency. The decrease of BOD for waste plastic bottle and sandbag (68.9% and 68.0% respectively) also showed favorable efficiencies.

모바일게임에서 확률형 아이템의 고시 확률과 실제 확률의 관한 연구

오종민(Jong-Min Oh),김정선(Jung-Sun Kim),김효남(Hyo-Nam Kim) 한국컴퓨터정보학회 2020 한국컴퓨터정보학회 학술발표논문집 Vol.28 No.2

국내 모바일 MMORPG 시장에서 구글플레이 스토어, 앱 스토어의 매출 순위를 보면 순위 안에 있는 게임 중에 가챠 시스템이 없는 게임을 찾기가 힘들 정도로 모바일게임에서 가챠 시스템은 게임의 전체 매출에서 많은 비중을 차지한다. 과거 가챠 시스템으로 인하여 사행성과 과금 유도가 너무 심해져 2015년 확률형 아이템 규제 법안이 발의되어 현재까지 게임회사들은 확률을 공개해왔다. 하지만 공개된 확률에는 유저들이 모르는 큰 오류가 존재한다. 본 논문에서 그 오류를 알아보고 모바일 게임 가챠 시스템의 건전성을 확보하기 위한 방안을 제시하고자 한다.

산림유역에서 유출되는 계류수질 특성

오종민(Jong Min Oh),신동엽(Dong Yub Shin) 한국수처리학회 1999 한국수처리학회지 Vol.7 No.1

Seasonal variation of streamwater quality was observed every months from May 1997 to April 1998. Beside, temporal variation of streamwater quality and discharge were examined during rainfall-runoff period. Based on these data, we evaluated annual loading of pollutants discharged from forest basin. Main results obtained in this paper are as follows: Annual average pH was 7.31 and percentage of saturated DO concentration was represented 89∼96% in each site. Streamwater quality was determined by amounts of rainfall, soil profile of sites and recharging underground water in rainy days. However, Streamwater quality was determined by only recharging underground water in sunny days. Annual runoff loading was investigated that Ca^(2+) is 23.8ton/yr, Na^+ is 7.0ton/yr, K^+ is 2.4 ton/yr, Cl^- is 1.9ton/yr, NO₃-N is 1.6ton/yr, Mg^(2+) is 1.7ton/yr and SO₄^(2-) is 2.6ton/yr. In rainy days, runoff loading was contributed to annual loading about 20%.

An Experimental Study for Improvement of EOP Abnormal Vibration on Automatic Transmission

오종민(Jongmin Oh) Korean Society for Precision Engineering 2023 한국정밀공학회지 Vol.40 No.3