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송창수, 이용규 호남대학교 산업기술연구소 2014 녹색산업연구 Vol.20 No.1
본 연구는 황룡강의 수질 변화를 검토하고, 이를 바탕으로 향후 수질개선방안을 도출하고자 하였다. 황룡강의 수질 변화는 2005년~2013년 기간에 대하여 검토하였으며, 저수기와 평수기에 대한 수질의 변화를 검토하였다. 하천의 주요 유입원을 장성호, 장성하수종말처리장, 유역유입원으로 구분하였으며, 이에 대한 대안으로 장성호의 수질개선, 장성하수종말처리장의 방류수질 개선 및 오염 우려 소하천인 개천 관리를 제시하였다. 개선 달성여부에 대한 방법론으로 QUAL-MEV모델을 사용하였으며, 2012년 기준으로 검보정을 실시하였다. 이상의 연구결과는 황룡강의 수질 개선을 위한 대안설정에 활용될 수 있다. This investigation was conducted to provide the yearly variation and the improvement on water quality in Hwangyrong river. The water quality variation is studied from 2005 to 2013, low water level and average water level. The important pollutant point is divided Jangseong Lake, Jangseong Wastewater Treatment Plant, Jangseong Basin and we studied the improvement result on each scenario. The tools is used steady state QUAL-MEV model and calibrated on 2012 year. The result is applied to the alternative plans on improvement in Hwangryong river.
Lee, Yonggyu,Oh, Seungmook,Kim, Changup,Lee, Junsun,Lee, Kanghun,Kim, Junghwan Elsevier 2018 Applied thermal engineering Vol.138 No.-
<P><B>Abstract</B></P> <P>The purpose of the present study was to investigate the performance of the dual-port injection (DPI) system in an automotive spark-ignition engine. The DPI system utilizes two port fuel injection (PFI) injectors per cylinder, i.e., one injector at each intake port. An original 4-cylinder PFI engine head was modified to accommodate total 8 PFI injectors. In the present study, three spray angles and two install configurations were investigated in the intake port visualization, steady-state part-load experiments, and cold-start experiment. The intake port spray visualization experiment showed that the wider fuel spray provided better fuel distribution, but also more wall wetting. The steady-state engine experiment at the several critical part-load conditions showed that the DPI system in combination with the open-valve-injection strategy achieved the most brake specific fuel consumption (BSFC) reduction of 4.6%. The average BSFC reduction of the 9-point experiment was 2.8%. The cold-start experiment also showed a fuel economy gain by the DPI system. In the cold-start experiment the wider spray angle exhibited higher total hydrocarbon emission likely due to the greater wall wetting observed in the intake port spray images.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Dual port-fuel injection (DPI) for a spark ignition engine. </LI> <LI> High-speed camera visualized the wider spray angle of the DPI system. </LI> <LI> The DPI improved fuel economy by 2.8%. </LI> <LI> The DPI reduced hydrocarbon in cold-start. </LI> </UL> </P>
Dynamic burst length controlling based loss differentiation in OBS networks
Yonggyu Lee, Seong Gon Choi 충북대학교 컴퓨터정보통신연구소 2014 컴퓨터정보통신연구 Vol.22 No.1
All core nodes have fiber delay lines with a fixed basic delay line under some optimal traffic conditions. This means that if traffic conditions change, then the basic delay line or fiber delay lines should be altered. However, because fiber delay lines are fixed hardware components, they are not easily replaced. So, a new service differentiation algorithm using fixed fiber delay lines is proposed. In order to achieve service differentiation, according to traffic conditions, the algorithm recalculate the threshold value for each data burst under threshold based burst assembly mechanism. In order to show the effectiveness of our new algorithm, extensive simulations and numerical analyses were performed.
Study on COP Variations with the duration of Ground Source Heat Pump Systems Operation
이용규(Lee, Yonggyu),백남춘(Baek, Namchoon),윤응상(Yoon, Eungsang) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
In this study, the COP variation with the duration of Ground Source Heat Pump (GSHP) systems operation was analyzed by experiment. This experimental facility was installed in residential house as a back-up device of solar thermal heating system. The capacity of heat pump is 2.5 kW with a vertical bore hole of 150m depth. The COP of GSHP is varied, depending on the ground temperature which is used as a heat source. The ground heat source temperature influencing heating COP is the soil or rock temperature which adjoin with geo-source heat exchanger. This temperature is decreased rapidly according to the operation duration of heat pump. As a result, COP of GSHP is decreased to 3 in one hour of continuous operation time.