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유재나,백현욱,김태형,오재일 대한상하수도학회 2013 상하수도학회지 Vol.27 No.5
Real time control (RTC) can be broadly defined as a system that dynamically adjusts the operation of facilities in response to online measurements in the field to maintain and meet the operational objectives, both during dry and wet weather conditions. RTC adds a dynamic component that is actively adjusted in real time based on system conditions. In terms of reducing or eliminating sewer flooding, CSOs and/or managing flows, implementation of RTC has various benefits to sewer system operation. It has been emerging as an attractive approach, but related elements (such as framework for the application, its components and equipments, aspects to be considered) towards its application on sewer systems have not been throughly introduced so far. The main goal of this study is to review several applications of RTC and firm guidelines published abroad, and finally to provide a framework for the proper application of RTC on sewer systems.
유재나,오재일,이호령 대한상하수도학회 2012 상하수도학회지 Vol.26 No.5
Recent serious of flooding events in urban area have brought a growing concern on storage facilities as a major stormwater management method. The Korean Ministry of Environment has announced diverse plans to tackle the problem, including plans for multi-purpose storages which deal both the stormwater and wastewater. Even though storages can be categorized for different perspectives, classification of possible storages in urban area has not been throughly studied so far. This study investigated diverse references of urban storages and suggested systematic classifications on structural, functional and some other basis. Structural classification mainly concerns structural shape of facilities and includes ①Cisterns & Rain barrels, ②Forebays, ③Dry basins, ④Wet basins and ⑤Constructed wetland. Those functions can be ①flood prevention ②water quality control and ③reuse of stored water. Other criteria that categorize storages depend on ①height, ②location, ③configuration, ④depth, ⑤site of the installation and ⑥shape.
유재나,오재일,이경용 대한상하수도학회 2011 상하수도학회지 Vol.25 No.6
In the era of climate change, the feasibility of a 'multi-functional storage facility' was evaluated in terms of various key performance indices such as flooding prevention effects, urban pollution reduction effects, and rainwater harvesting effects. As a result, the Korea Ministry of Environment introduced a new concept of 'multi-functional storage facility' for sewer flooding prevention and urban non-point pollution reduction. Prior to introducing these infrastructure (a large underground storage facility), the more details were needed to examined carefully in terms of technical aspects of construction and management. It is also well known that the validity of installation of 'multi-functional storage facility' was sometimes weakened because of low B/C ratio.
유재나,오재일,최익훈 대한상하수도학회 2011 상하수도학회지 Vol.25 No.2
Pearson's correlation was used to determine relations between infiltration and affecting factors using flow monitoring data measured in 24 areas with different characteristics. Factors showed relatively high correlations than others were indexed to determine infiltration rates of the study area. Among 8 factors(service area, sewer length, sewer diameter, multiplier of sewer length and diameter, number of manholes, population, number of properties, number of households) tested, the multiplier of sewer length and diameter, the number of population and the number of household in each service area indicated higher correlation coefficient(>0.8) than others. The goodness of fitness of linear regressions between infiltration and the factors followed the order: sewer length and diameter(0.68)> population(0.65)> number of household(0.60). Infiltration rates calculated by the multiplier of sewer length and diameter, the number of population and the number of household in each service area were 0.046∼1.0396 m3/d·mm-km, 0.0917∼1.7355 m3/capita·d, 0.196∼4.529 m3/household·d respectively. After sewerage rehabilitation work of the area, the infiltration rates calculated by above factors with high correlations are expected to be used for comparing effectiveness of the work once they are estimated under the same flow measuring conditions.
유재면,Yu, Jae-Myeon 한국공정경쟁연합회 2006 경쟁저널 Vol.- No.124
웅진식품은 음료사업 진출 10주년이 되는 해에 새로운 사령탑으로 유재면 대표이사를 선임했다. 유재면 사장은 음료시장의 전반적인 침체와 이렇다 할 히트 제품의 부재로 난관에 부딪친 웅진식품의 새 사령탑으로 부임하면서, 향후 10년 내에 세계 1위 브랜드 2개를 달성하고자 하는 웅진식품의 장기적 성장 비전을 수행할 중책을 맡게 됐다.
플라즈마 전해 산화 표면처리 된 AZ31B 소재의 표면 조도 및 광학적 특성연구
유재인,윤주식,윤재곤,김진희,최순돈,유재용,장호경,김기홍,Yu, Jae-In,Yun, J-S,Yoon, Jae-Gon,Kim, Jin-Hi,Choi, Soon-Don,Yu, Jae-Yong,Jang, Ho-Kyeoung,Kim, Ki-Hong 한국레이저가공학회 2013 한국레이저가공학회지 Vol.16 No.4
The surface oxidation of magnesium was performed by Plasma electrolytic oxidation treatment method. And the optical reflectance spectra of the oxidation layers are studied. In the PEO process, the growth of the oxide layer take place at room temperature. Surface roughness of the obtained result, the average surface roughness is $0.08{\mu}m$ difference. The reason seems to the influence of the $Na^+$.