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이진원(C.W.Lee),장욱진(W.J.Jang),이장무(J.M.Lee),박영일(Y.I.Park) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
This paper reviews the time-domain model of Ishihara and transforms it in the frequency domain. The frequency domain model of torque converter can be widely used in designing and analyzing power-train vibration characteristrics. The torque converter on the experiment, has a cut-off frequency below 10Hz as predicted in the numerical calculation.
Conceptual Design of PLS-II Control System for PLS
J.C. Yoon(윤종철),J.W. Lee(이진원),E.H. Lee(이은희),H.G Ha(하기만),J.M. Kim(김재명),S.J. Park(박성주),K.R. Kim(김경렬) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
PLS(Pohang Light Source) will begin the PLS-Ⅱ project that has been funded by the KOREA Government in order to further upgrade the PLS which has operated since 1992. The control system of the PLS-II has distributed control architecture, with two layers of hierarchy; operator interface computer (OIC) layer and machine interface computer (MIC) layer. The OIC layer is based on SUN workstation with UNIX. A number of PC-based consoles allow to remotely operating the machine from the control room. PC-based consoles use the Linux or Windows operation system. Similar consoles in the experimental hall are used to control experiments. The MIC layer is directly interfaced to individual machine devices for low-level data acquisition and control. MIC layer is based on VMEbus standard with vxWorks real-time operating system. Executable application software modules are downloaded from host computers at the system start-up time. The MIC's and host computers are linked through Ethernet network. It should enable the use of hardware and software already developed for specific light source requirements. The core of the EPICS (Experimental Physics and Industrial Control System)[1] has been chosen as the basis for the control system software.
노즐특성에 따른 MIST-COOLING 열전달에 관한 실험적 연구
이진원,강영규,백병준,박복춘 ( J . W . Lee,Y . G . Kang,B . J . Baek,B . C . Park ) 한국열처리공학회 1992 熱處理工學會誌 Vol.5 No.3
The effect of nozzle characterristics on the mist-cooling heat transfer was investigated under the various flow conditions. Two different types of twin fluid nozzle were used, one is a 90° angle tip nozzle with needle and the other is a 90° angle tip non-needle nozzle. The cooling rate from the heated surface was measured and obtained the boiling curve as a function of surface temperature. An immersion sampling was employed for the measurement of droplet size of the spray. As a result of this experiment, the liquid sheet type nozzle shows better atomization when the mass ratio Mr>2.0, and collects more liquid droplets on the heated surface that results in better cooling effect. It was found that the maximum heat flux and heat transfer coefficient increased with increase in the volumetric flow rate, whereas the maximum heat flux decreased with increase in spray distance. The cooling effect depends upon the amount of collected droplet and droplet size, but it strongly depends upon the amount of collected droplet.