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이원용,임봉수,박인성,Lee, Wonyong,Lim, Bongsu,Park, Insung 한국물환경학회 2017 한국물환경학회지 Vol.33 No.4
This study was to estimate the reduction effect of nonpoint source pollutants according to the rainfall intensity and drainage of infiltration grate inlet. Soil infiltration flow was measured on-site and SS load by the filter part was calculated by the experimental data in laboratory reactor test. Soil infiltration flow was measured to be about $1m^3/hr$ in soil condition saturated with water. The filter part of the infiltration grate inlet was a hydraulic equipment unhindered by soil infiltration on the bottom of the storage tank, because the infiltration flow was measured to be about $3m^3/hr$ continuously in the closing infiltration hole condition. Infiltration flow and SS load were over about $1m^3/hr$ and 1.71 kg according to laboratory results by the filter part using the artifical sample. Therefore, the above values could be presented as the limitted value to start the reduction of filtration effect. Reduction efficiencies of SS load by the filter part for the rainfall intensity were about 87 % at 5 mm/hr and about 61 % at 10 mm/hr in consideration of one infiltration grate inlet got the drainage area about $200m^2$. The reduction efficiency of nonpoint source pollutants was very effective in the first flush rainfall. However, the reduction efficiency by rainfall density was higher than by flow.
합성 데이터와 텍스트-심볼 통합 검출을 활용한 이미지 형식 P&ID 인식 기법
이원용(Wonyong Lee),김미주(Mijoo Kim),문두환(Duhwan Mun),김형기(Hyungki Kim) (사)한국CDE학회 2021 한국CDE학회 논문집 Vol.26 No.4
A Piping and Instrumentation Diagram (P&ID) is a diagram used in the process plant industry. Digital format P&ID like intelligent P&ID can utilize DB technology, so it is easy to search and modify. Therefore, its use in the field has become common. However, there are cases in which digital P&IDs do not exist but exist only in image format because they were created before the digital P&ID was universalized or for security reasons. Thus, a technique for converting image format P&ID to digital P&ID is required. In this study, by modifying the deep learning-based symbol and text recognition structure presented in previous studies for symbol and text recognition of image format P&ID we propose a new structure that can improve performance while reducing the amount of computation required for recognition. In addition, we propose a synthetic data generation method suitable for P&ID in order to improve symbol recognition performance through data augmentation of the P&ID dataset. An experiment was performed to confirm the symbol and text recognition performance through a total of 82 P&ID drawings, and it was confirmed that the symbol and text recognition performance was improved through the method proposed in this study.
가정용 연료전지 시스템 대상 시뮬레이션 기반 비용절감 기법 연구
황수영(Suyoung Hwang),김민진(Minjin Kim),이진호(Jinho Lee),이원용(Wonyong Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Residential fuel cell cogeneration systems have gained much interest due to its high efficiency. In this study, we have performed numerical simulation of residential fuel cell cogeneration system which includes a fuel cell/grid hybrid system. The cogeneration system consists of 1㎾ PEFC, cooling system, inverter/converter and reformer. Several empirical models have been employed for respective components to improve the accuracy of the simulations. The load varies seasonally. The present simulations can successfully predict the characteristics of the hybrid cogeneration system and thus it can be utilized for establishing an optimal operating strategy of the system.