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아질산성질소 축정용 FIA의 제작 및 용용에 관한 연구 (광주광역시 광주천 시료를 대상으로)
이재성 ( J. S. Rhee ),박완철 ( W. C. Park ),이수원 ( S. W. Lee ),김용준 ( Y. J. Kim ) 한국물환경학회 2002 한국물환경학회지 Vol.18 No.3
In this study, home-made detection system by means of noble FIA is introduced on the measurement of toxic nitrite in the water samples collected from the area of Kwangju. As the standard calibration between 30 to 1000 ppb, the linearity has been shown more than 0.9999 as the correlation coefficient(R^2) with the detection limit 1.5 ppb(S/N>2). The distribution of sample concentration was monitored as N.D. - 123 ppb which is wide span of concentrations in field water samples. The low level of nitrite is hardly detectable with other expensive sophisticated instruments including ion chromatography. Whereas the result of high concentration brings forth the necessity monitoring constantly our precious water resources. Successfully, the FIA system has played a very important role detecting wide span of nitrite in water sample. This technique can be adopted for controlling our environment in the near future.
자동차 이중전원 시스템을 위한 새로운 ZVS 양방향 CUK DC/DC 컨버터
이성룡(S.R. Lee),이수원(S.W. Lee),고성훈(S.H. Ko),문제민(J.M. Mun) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
Currently, to overcome the limit of a 14V power supply system and to enhance the stability of this system high and to make the fuel efficiency better, a research development of a 42V power supply system is actively the progress. As an intermediate step to change into an unity power supply system, a 42V/14V dual power supply system uses a DC/DC Converter as one of structure elements. Considering the main electric power sources in the next generation of the car is a 42V system, a 14V power supply system has advantages as follows : to be managed efficiently and to increase the redundancy at start, to jump start with any vehicles, etc. We need the introduction of a bi-directional converter that can flow the energy each other in a dual 42V-12V system. This paper proposed the ZVS bi-directional CUK DC/DC converter which decrease the weight with the size of the DC/DC Converter and minimize the loss when the switching happen. In this paper, a circuit design method and an action principle of the circuit was proposed. To verify the proposed circuit, a comprehensive evaluation with theoretical analysis, simulation results is presented.
가솔린엔진의 밸브오우버랩 동안 밸브타이밍이 역류에 미치는 영향
오승묵(S.M.Oh),황정선(J.S.Hwang),강건용(K.Y.Kang),정용일(Y.I.Jeong),이수원(S.W.Lee),김성래(S.R.Kim),이창길(C.G.Lee) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
The backfire could be caused by the backflow of hot burned gas from the cylinder into the intake port. Especially. in the case of gaseous fuel engines. the possibility of backfire occurrence is higher since the ignition temperature is lower than that of liquid fuel.<br/> In this study. prior to conversion of gasoline engine to LPG engine. the backflow was measured at four different valve timings(type Ⅰ,Ⅱ,Ⅲ,Ⅳ) in a gasoline engine. To quantify the amount of backflow. hot wire anemometry was adopted and its signal was analyzed as the change of temperature and flow in the intake port.<br/> It was found that the backflow was decreased with increasing the engine load. When the intake valve timing was retarded. the backflow was not found nearly and the power was decreased a little at low engine speed.<br/>
권혁대(H.D. Kwon),박천성(C.S. Park),조성필(S.P. Jo),고성훈(S.H. Ko),이수원(S.W. Lee),이성룡(S.R. Lee) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
This paper deals with the electric energy saving system for lighting with power conditioning, which aims at the integration of power quality improvement and energy saving. The system consists of a CCVSI(Current-Controlled Voltage Source Inverter) and VCVSI(Voltage-Controlled Voltage Source Inverter). The CCVSI is connected in parallel to a grid, which can be operated to compensate the reactive power demanded by nonlinear and variation loads. The VCVSI is connected to the CCVSI through the DC capacitor (DC side) and in series on the AC side(lighting load), which can perform the energy saving. The operation of the proposed system is confirmed through the simulation and its usefulness is discussed.
이성룡(S. R. Lee),전칠환(C. H. Jeon),이수원(S. W. Lee),이은철(E. C. Lee) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper studies Optical Fiber(OF) - LED illuminated display board system for energy saving. The OF-LED illuminated display board system has PV modules, batteries, and charge & discharge system, and dynamic full color display controller. Both maximum power point tracker (MPPT) and constant current & constant current controls (CCVC) are used to govern the charging system. It can be improve the charging efficiency of battery. The objective of this thesis paper is to build advertisement lighting system with OF-LED in to charge a 12-volts lead acid battery by using a field wired PV array. We saved the maintenance cost and developed of advertisement effectiveness. To verify the proposed OF-LED illuminated display board system for energy saving, the detail simulation and experiment results indicate that operating characteristics are verified by experiment with a laboratory prototype in this paper.
조장근(J.K. Cho),오상욱(S.W. Oh),박원규(W.G. Park),오세민(S.M. Oh),이수원(S.W. Lee) 한국전산유체공학회 1996 한국전산유체공학회 학술대회논문집 Vol.1996 No.-
The jet pump is being used in many fields for several purposes because of its simple construction and easy operation. The characteristics of the geometrical variables, pressure gradient and velocity distribution of the jet pump are studied using the CFD technique. The flow calculations through a bended nozzle, a mixing chamber and a venturi are presented and phenomenological aspects are discussed. This study solve 3-D steady incompressible Navier-Stokes equations using the Iterative time marching scheme. The governing equations are differenced with 1st-order accurate backward difference scheme for the time derivatives and 3rd-order accurate QUICK scheme for the convective terms, The Mark-and-cell concept was applied efficiently to solve continuity equation. which is differenced 2nd-order accurate central differenced scheme. The 4th-order artificial damping is added to the continuity equation for numerical stability. A O-type of grid system is generated inside a nozzle and venturi of the jet pump. It has concluded that the results of present study properly agree with physical flow phenomena.