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Ultrasonic alignment of micro-particles and live cells in PDMS micro-fluidic channel
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Reply to Roundtable on Francis M. Bator's "No Good Choices: LBJ and the Vietnam/Great Society Connection"
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목초액의 항균활성과 페놀화합물의 함량
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한국연초학회지
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Applications of Hydrochemical Models for the Assessment of Groundwater
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Modeling and Simulation of Windgenerator with Fixed Speed Wind Turbine Under Matlab-Simulink
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- 저자 : 변종윤(Byun, JongYun) (검색결과 5 건)
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진희남(Hee-Nam Jin),변종윤(Jong-Youn Byun),서상호(Sang-Ho Sub),노형운(Hyung-Woon Roh) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
Sedimentation phenomenon of suspended solids occurs by the gravitational force. Pollution particles are separated from slowly flowing wastewater in clarifier. Recently, the sludge suction collector is preferred rather than the scraper type sludge collector due to enhancement of the clarifier efficiency. The sludge suction collector is usually operated by the user's experiences without any scientific and/or technical consideration. To evaluate the performance. of sludge suction collector, the three dimensional computer simulation was conducted by the finite volume method. To analyze the performance, the velocity vectors and the suction flow rates of the orifices were investigated. The result showed that each suction flow rate through out the collector was equivalent in the sludge suction collector and the efficiency of suction collector was good to remove high concentrated sludge in clarifier.
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진희남(Hee-Nam Jin),변종윤(Jong-Youn Byun),노형운(Hyung-Woon Roh),서상호(Sang-Ho Suh) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Sedimentation phenomenon of suspended solids occurs by the gravitational force. Pollution particles are separated from slowly flowing wastewater in clarifier. Recently, the sludge suction collector is preferred rather than the scraper type sludge collector due to enhancement of the clarifier efficiency. The sludge suction collector is usually operated by the user's experiences without any scientific and/or technical consideration. To evaluate the performance of sludge suction collector, the three dimensional computer simulation was conducted by the finite volume method. To analyze the performance, the velocity vectors and the suction flow rates of the orifices were investigated. The result showed that each suction flow rate through out the collector was equivalent in the sludge suction collector and the efficiency of suction collector was good to remove high concentrated sludge in clarifier.
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격자 기반 공간보간 기법을 활용한 국내 PM10 자료의 시공간적 변동성 분석
이진욱(Lee, Jinwook),변종윤(Byun, Jongyun),황승현(Hwang, Seunghyun),전창현(Jun, Changhyun),백종진(Baik, Jongjin) 한국방재학회 2022 한국방재학회논문집 Vol.22 No.1
본 연구에서는 2001년부터 2019년까지 관측된 국내 PM10 자료에 대한 시공간적 변동성 분석을 수행하였다. 이를 위해 연도별로 최소 175개에서 최대 484개의 지점 자료를 역거리가중법을 이용하여 공간보간하였다. 웨이블릿 분석을 통해 일평균 자료에 대한 주기적 변동성에 대해 검토한 결과, PM10은 약 1년 정도의 기간을 두고 규칙적으로 반복하는 것을 확인할 수 있었다. 월평균 및 연평균 자료에 대해 Mann-Kendall 검정을 적용한 결과, 1년에 약 1 μg/m3 정도 감소하는 추세를 보임을 확인하였다. 연평균 자료를 이용하여 격자 단위의 공간적 변화를 살펴본 결과, 북쪽으로 갈수록 상대적으로 PM10이 높게 나타났으며 시간이 지남에 따라 절대적인 관측값 및 편차가 상당히 감소된 것을 확인할 수 있었다. 전체 기간에 대한 연평균 자료들의 평균은 수도권 부근이 상대적으로 높은 것으로 확인되었으며, 표준편차에서도 유사한 경향을 확인할 수 있었다. This study analyzed spatiotemporal variability in domestic PM10 data from 2001 to 2019. From annual numbers of stations between 175 and 484, the point data at each station were spatially interpolated using the inverse distance weighted method. A periodic variability in daily mean data was examined through wavelet analysis, which showed that there was a clear annual pattern with the periodic change following a regular cycle. The Mann-Kendall Test for monthly and annual mean data showed a decreasing trend in about 1 μg/m3 per year. The spatial change in the grid data for annual mean data represented that it was relatively higher in the northern regions than that in the southern regions and its mean and deviation decreased significantly over time. For the entire period of observation data, it was found that annual mean and standard deviation of PM10 concentrations were relatively high in the region near the metropolitan area.
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위성 기반 재분석 강수 자료를 이용한 한반도 격자형 확률강수량 산정
이진욱,전창현,김현준,변종윤,백종진,Lee, Jinwook,Jun, Changhyun,Kim, Hyeon-joon,Byun, Jongyun,Baik, Jongjin 한국수자원학회 2022 한국수자원학회논문집 Vol.55 No.6
This study estimated the grid-type precipitation quantile for the Korean Peninsula using PERSIANN-CCS-CDR (Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks-Cloud Classification System-Climate Data Record), a satellite based re-analysis precipitation data. The period considered is a total of 38 years from 1983 to 2020. The spatial resolution of the data is 0.04° and the temporal resolution is 3 hours. For the probability distribution, the Gumbel distribution which is generally used for frequency analysis was used, and the probability weighted moment method was applied to estimate parameters. The duration ranged from 3 hours to 144 hours, and the return period from 2 years to 500 years was considered. The results were compared and reviewed with the estimated precipitation quantile using precipitation data from the Automated Synoptic Observing System (ASOS) weather station. As a result, the parameter estimates of the Gumbel distribution from the PERSIANN-CCS-CDR showed a similar pattern to the results of the ASOS as the duration increased, and the estimates of precipitation quantiles showed a rather large difference when the duration was short. However, when the duration was 18 h or longer, the difference decreased to less than about 20%. In addition, the difference between results of the South and North Korea was examined, it was confirmed that the location parameters among parameters of the Gumbel distribution was markedly different. As the duration increased, the precipitation quantile in North Korea was relatively smaller than those in South Korea, and it was 84% of that of South Korea for a duration of 3 h, and 70-75% of that of South Korea for a duration of 144 h.
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