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Evaluation of Pollutant loads at Inflow Streams under Ara Waterway Basin
한상윤,정종태,Han, Sangyun,Jung, Jongtai Urban Science Institute 2021 도시과학 Vol.10 No.1
In this study, to evaluate the characteristics of the pollution in the major inflow tributaries and major environmental facilities in the watershed of Ara waterway, An inflow flow rate measurement and water quality analysis were conducted during dry and rainy seasons. In addition, the flow rate measurement, water quality analysis, and pollutant load at each monitoring point were compared and evaluated. Influx of BOD5, T-P and T-N into the tributaries of the ARA waterway watershed, excluding the Gulpo river watershed, during dry season were only 0.007%, 0.005% and 0.004% respectively of the incoming loads in the entire ARA waterway basin. In addition, it was confirmed that the discharge pollutant loads during rainfall event was about 440 times more for BOD5, about 545 times on T-P, and about 23 times on T-N in comparison to the pollutant loads during the dry days. When the Gulhyeon rubber dam was deflated, the discharged pollutant load during a rainfall was higher than the estimated load at the G7 monitoring point because the deposited pollutants from the upstream riverbed flowed down. Therefore, during a rainy season, it is necessary to manage the influx of high-load water pollutants from the overflow and deflation of the Gulhyun rubber dam as well as to find a strategy to reduce the pollutant loads in the Gulpo river watershed.
투수블록시설의 유출저감효과 분석 및 강우강도-지속시간 관계 분석
한상윤(Sangyun Han),길경익(Kyungik Gil) 한국습지학회 2020 한국습지학회지 Vol.22 No.1
비점오염은 수계에 악영향을 끼치며 그 영향은 점차 커지고 있다. 이러한 비점오염을 관리하기 위해 정부에서는 LID(Low Impact Development) 시설의 연구와 다양한 효율평가를 시행하고 있다. 본 연구에서는 다양한 LID 시설 중 실제 설치된투수 블록 시설의 강우 유출 억제를 위한 유출 저감율, 저류 강우량 분석 및 유출 지연시간 그리고 최대 유입 및 유출의저감율을 분석했으며, 그 결과를 각 시설 간 비교했다. 불투수블록, 필터형 투수블록, 틈새형 투수블록 순서대로 분석 결과저감 효율이 높게 나타났으며, 이를 통해 강우강도-유출지연시간간의 관계를 나타낸 그래프를 제시하였다. 이 그래프를통해 앞으로 설계 시, 본 시설과 유사한 투수블록 시설의 재현 기간에 따른 시설 용량 선정 등의 설계에 도움을 줄 수 있으리라 생각한다. Non-point pollution adversely affects the water system and its influence is increasing. In order to manage such nonpoint source pollution, the government has conducted studies on LID (Low Impact Development) facilities and various efficiency evaluations. In this study, the actual installed permeable block facility among the various LID facilities was analyzed the effluent reduction rate, the residual rainfall analysis, the runoff duration time and the reduction rate of the maximum inflow and outflow for the rainfall runoff control and the results were compared the other facilities. The analysis results show that the reduction efficiency is high in order of impermeable block, filter type permeable block, and clearance type permeable block, and the graph showing the relationship between the rainfall intensity and the runoff duration time is presented. This graph can be helpful in the design of facilities such as the facility capacity selection according to the reproduction period of the permeable block facility similar to this.
한상윤(Sangyun Han),강성호(Sungho Kang) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.22 No.2A
Hardware simulation is a viable approach for simulation of large systems since simulation time increases rapidly as a function of the size and complexity of the systems to be simulated. A specialized single chip massively parallel array processor has been designed for use as a hardware accelerator for logic and fault simulation. This array processor consists of an array of Boolean evaluator processing elements cells with local memories and communication interfaces. A logic performance gain is achieved over software simulator implementations.
양산자동차 부착 센서를 활용한 노면마찰계수 추정 알고리즘 개발
한상윤(Sangyun Han) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
In this study, we proposed a road surface friction coefficient estimation algorithm using a mass production vehicle sensor. The algorithm uses the current friction force as the road surface friction coefficient when the wheel slip occurs, and gradually increases the road surface friction coefficient calculated at the previous period when the wheel slip does not occur. By using the proposed algorithm, the real vehicle validation test was performed on the dry asphalt surface and ice surface. As a result of the test, it took up to 0.9 seconds to judge the coefficient of friction and judgment value of road friction coefficient showed error of maximum 0.2μ.
전동화 사륜구동 차량의 구동력 배분을 통한 핸들링 성능 향상
이종찬(Jongchan Lee),한상윤(Sangyun Han) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
In this study, we proposed an e-AWD vehicle handling algorithm. The algorithm proposed in this paper defines handling state into two categories, stable and unstable. In stable state, driving force distribution calculation is performed according to the torque distribution ratio set by the user, and in unstable state, driving force does not exceed friction limit of each tire. Simulation results show that the proposed algorithm can adjust turning characteristics of the vehicle to understeer or oversteer according to distribution ratio set by the user in stable state. And in unstable state the proposed algorithm greatly improves vehicle’s turning stability and driver’s intention followability.
하수재이용을 위한 총인처리공정과 오존산화공정의 기질처리특성 연구
정종태 ( Jongtai Jung ),한상윤 ( Sangyun Han ),조용현 ( Yonghyun Cho ),김연은 ( Yuneun Kim ) 한국수처리학회 2020 한국수처리학회지 Vol.28 No.1
In this study, we installed a device for the reuse of sewage treatment water at the end of the total public sewage treatment facilitylocated in B city of Gyeonggi-do. The ozone oxidation process was composed of the following: a device for dissolving ozone; a non-contact plasma water treatment device; a reaction tank; and a discharge ozone treatment device. We constructed the ozone oxidation process in connection with the total phosphorus treatment facility to obtain stable sewage recycled water quality for secondary sewage treatment water, and studied the substrate removal characteristics according to ozone dissolution characteristics and ozone dosage. The CODremoval rate increased from 16.2% to 38.7% as the ozone dosage rate increased from 30 g/hr to 68 g/hr, averaging 0.41 gCOD/gO<sub>3</sub>. The BOD removal rate increased from 22.2% to 59.5%, and the amount of BOD removal (g) per g ozone ranged from 0.34 g/hr to 0.57 g/hr, averaging 0.43 g BOD/gO<sub>3</sub> under a flow rate of about 300 ㎥/day. The color removal rate was increased in proportion to the ozone dosage amount with the exception of the violet color, which tended to remain somewhat visible.