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원단위와 LID 시설규모 산정을 위한 상업지역과 위락시설지역의 유출율 분석
최동호 ( Dong Ho Choi ),정재운 ( Jae Woon Jung ),윤광식 ( Kwang Sik Yoon ),백상수 ( Sang Soo Baek ),유승화 ( Seung Wha Yoo ),범진아 ( Jin A Beom ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.3
In this study, runoff ratios of commercial area and public park were analyzed based on monitoring data. The imperviousness was 84∼85% for commercial area and 5∼37% for public park, respectively. National Institute of Environmental Research (NIER) guideline suggested weighted runoff ratio which use rainfall weighting factor to runoff ratio of four rainfall groups to assess nonpoint source pollution. The arithmetic mean runoff ratio of commercial area and public park were similar to median value, but the estimated runoff ratio by NIER method was higher than those by arithmetic mean and median. The estimated runoff ratios of commercial area and public park by NIER method, which would be used for unit load determination, were 0.73 and 0.42, respectively. The rainfall amount for design LID facilities size, which ranks 80%, was 19.5mm and corresponding runoff ratio of commercial area and public park were 0.67 and 0.25, respectively. Therefore, runoff ratio investigated in this study would be used for unit load estimation and storage volume design of LID facilities for commercial area and public park.
컨셉 단계 유성기어 소음 개발을 위한 pRMC 프로그램 개발 및 적용에 관한 연구
이현구(Hyunku Lee),김무석(Moosuk Kim),이상화(Sanghwa Lee),서현승(Hyunsueng Suh),백상범(Sangbum Baek),칼만아멧(Ahmat Kahraman) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
To predict the optimized planetary gear sets that have quite gear noise in early design stage, Planetary Run Many Cases(here after pRMC) program which is using the combination analysis method of all gear specifications to find out the best planetary gear specification is developed. The pRMC is composed of 5 steps, generate, setting, evaluate, combine and analysis and been also capable of analyzing any number of simple, compound or complex-compound planetary gear set. After calculating of all candidate gear sets, pRMC could show some results likewise transmission errors, sum of forces, contact ratios and so on. By using the pRMC, the best planetary gear sets which have low noise level could be developed easily and successfully in the new automatic transmissions and others.
위락시설지역의 초기세척현상과 초기 강우-유출고 저류에 따른 저감효율 분석
정재운 ( Jae Woon Jung ),박하나 ( Ha Na Park ),최동호 ( Dong Ho Choi ),백상수 ( Sang Soo Baek ),윤광식 ( Kwang Sik Yoon ),백원진 ( Won Jin Back ),범진아 ( Jin A Beam ),임병진 ( Byung Jin Lim ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.5
Nonpoint source pollution characteristics of recreation park was investigated. Runoff ratio of recreation park ranged 23-57%, which was lower than other urban area since impervious area was less than 37%. The average BOD, COD, TOC, SS, T-N, T-P, were 14.09, 32.86, 12.19, 121.51, 7.78 and 0.72 mg/L, respectively. First flush of recreation park was analyzed by normalized cumulative load - volume curve and mass first flush ratio(MFFn), MFF10 for BOD, COD, SS, T-P, T-N, TOC were 2.90, 1.59, 2.15, 2.74, 2.60, and 1.59, respectively. Observed data showed that 62% of pollutant could be removed by storaging 5 mm rainfall-runoff and even 3 mm depth could store up to 50% of pollutant in runoff.