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이호준(Ho-June LEE),황상윤(Shang-Yoon HWANG),김경진(Kyoung-Jin KIM) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
Multi-path ultrasonic flowrate measuring technology is being received much attentions from a variety of industrial fields to exactly measure the flowrate. Multi-path ultrasonic flowmeter has much advantage since it has no moving parts and not occurred pressure loss. It offers good accuracy, repeatability, linearity and Turn-down ratio can measure over 1:50. The present study investigates flowrate integration errors using weighting factors. A theoretical flow model uses power law to describe a fully developed velocity profiles and wall roughness changes. The methods of weighting factor simulate three configurations of measuring location of gaussian, chebyshev and tailor method. The obtained results show that many chord arrangements are not affected for wall roughness changes and can measure accurate flowrate.
이호준(Ho-June Lee),이권희(Kwon-Heuy Lee),이창호(Chang-Ho Lee),장효준(Hyo-June Jang),노석홍(Seok-Hong Noh) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The inclined jet issued from a soft nozzle has been used to dye and transfer the fabric in dyeing machinery. The efficiency of these dyeing machines is dependent on the jet characteristics such as jet angle, flow rate, velocity, pressure distributions, etc. In this study, We carried out experiment and computational analysis to understand the dyeing jet characteristics in the rapid dyeing machinery. An axi-symmetric incompressible Navier-Stokes equation with k- turbulence model and implicit VOF method. are used in computation. The pressure ratio applied in nozzle operation is in the range of 1.5 and 2.5, the diameter of nozzle exit is in the range of 1.74 ㎜ ~ 3.71 ㎜. Computational results are compared with experimental results.
가중계수법을 이용한 5회선 초음파 유량계의 유속적분방법의 불확도 평가
이호준(Ho-June Lee),이권희(Kwon-Hee Lee),노석홍(Seok-Hong Noh),황상윤(Sang-Yoon Hwang),노영아(Young-Ah Noh) 한국유체기계학회 2005 유체기계 연구개발 발표회 논문집 Vol.- No.-
Flow rate measurement uncertainties of the ultrasonic flow meter are generally influenced by many different factors, such as Reynolds number, flow distortion, turbulence intensity, wall surface roughness, velocity integration method along the acoustic paths, and transducer installation method, etc. Of these influencing factors, one of the most important uncertainties comes from the velocity integration method. In the present study, a optimization weighting factor method for 5-chord, which is given by a function of the chord locations of acoustic paths, is employed to obtain the mean velocity in the flow through a pipe. The power law profile is assumed to model the axi-symmetric pipe flow and its results are compared with the present weighting factor concept. For an asymmetric pipe flow, the Salami flow model is applied to obtain the velocity profiles. These theoretical methods are also compared with the previous Gaussian, Chebyshev, and Tailor methods. The results obtained show that for the fully developed turbulent pipe flows with surface roughness effects, the present weighting factor method is much less sensitive than Chebyshev and Tailor methods, leading to a better reliability in flow rate measurement using the ultrasonic flow meters.
평판형 대기압 플라즈마를 이용한 공기정화장치 개발 및 광학적 특성 분석
이영호(Young-Ho LEE),최용석(Yong-Suk Choi),하창승(Chang-Seung Ha),김동현(Dong-Hyun Kim),이해준(Hea-June Lee),이호준(Ho-Jun Lee),박정후(Chung-Hoo Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
대기압 플라즈마를 이용해 공기정화 System을 설계 및 제작 하였다. 본 연구에서는 평판형의 대기압플라즈마 발생장치를 만들어 공기가 통과하도록 설계하였으며, 공기가 플라즈마와 넓은 면적에서 반응할수 있도록 플라즈마가 발생하는 부분을 multi hole로 제작하였다. 공기는 플라즈마가 발생되는 hole을 통과하면서 반응이 일어나며 이를 알아보기 위하여 OES 측정을 하였다. 또한, MgO가 대기압 플라즈마발생에 미치는 영향을 파악하기 위해 Panel에 MgO를 도포한 것과 도포하지 않은 것 2가지 경우의 Panel을 제작하여 OES로 측정 및 분석 하였다.
Global Modeling of Atmospheric Pressure Oxygen Plasmas
황석원,이호준,이해준,Hwang, Seok-Won,Lee, Ho-Jun,Lee, Hae-June The Korean Vacuum Society 2011 Applied Science and Convergence Technology Vol.20 No.4
대기압에서 산소 플라즈마가 생성될 때 생기는 화학종의 밀도와 전자 온도를 정성적으로 분석하기 위하여 전산모사 방법 중 하나인 공간 평균 모델을 개발하였다. 본 논문에서는 플라즈마 바늘(plasma needle) 장치를 이용하여 전산모사를 수행하였다. 생성된 화학종 중, O, $O_3$, $O_2*$, ${O_2}^+$ 순서대로 높은 밀도를 가지고, 전자 에너지의 대부분이 산소 분자와의 이온화 과정과 여기화 과정에서 소모가 된다. 입력 파워가 증가할 때 대다수의 화학종의 밀도는 입력 파워가 증가한 비율만큼 증가하고, 산소 가스의 온도가 300 K에서 700 K으로 증가할 때는 오존 생성을 위한 삼체 충돌 현상이 약해져 오존 밀도가 감소한다. 방전 공간의 표면적에 대한 부피 비 또한 플라즈마 밀도와 전자 온도에 영향을 준다. A zero-dimensional global model simulator for atmospheric pressure oxygen plasmas has been developed. The simulation model considers the configurations similar to that of plasma needle device. The simulation results show that those species of O, $O_3$, $O_2*$ and ${O_2}^+$ have the highest density in sequence. Electrons dissipate most of their energy through the collisions with oxygen molecules. If the input power increases, the density of most species also increases as much as three-boy collision for the creation of ozone is weakened and hence the density of ozone decreases. The body to volume ratio also affects the plasma density.
박푸른솔,이호준,조영준,구본승,최원준,변종민,Park, Pureunsol,Lee, Ho Joon,Jo, Youngjun,Gu, Bonseung,Choi, Won June,Byun, Jongmin 한국분말야금학회 2019 한국분말재료학회지 (KPMI) Vol.26 No.6
High-entropy alloys (HEAs) are generally defined as solid solutions containing at least 5 constituent elements with concentrations between 5 and 35 atomic percent without the formation of intermetallic compounds. Currently, HEAs receive great attention as promising candidate materials for extreme environments due to their potentially desirable properties that result from their unique structural properties. In this review paper, we aim to introduce HEAs and explain their properties and related research by classifying them into three main categories, namely, mechanical properties, thermal properties, and electrochemical properties. Due to the high demand for structural materials in extreme environments, the mechanical properties of HEAs including strength, hardness, ductility, fatigue, and wear resistance are mainly described. Thermal and electrochemical properties, essential for the application of these alloys as structural materials, are also described.
인공위성용 홀 추력기의 중성기체에 대한 분자동력학 시뮬레이션
송인철,배효원,박정후,이호준,이해준,Song, In-Cheol,Bae, Hyo-Won,Park, Chung-Hoo,Lee, Ho-Jun,Lee, Hae-June 한국진공학회 2010 Applied Science and Convergence Technology Vol.19 No.2
소형위성의 추력시스템으로 사용되어지는 홀 추력기의 중성 기체 시뮬레이션을 수행하였다. 홀 추력기의 채널 내부에서의 난반사효과 및 초기 가스의 온도, 그리고 채널의 길이 등을 변수로 하여 계산되어진 밀도, 압력, 속도, 온도를 분석 하였다. 시뮬레이션에서 얻어진 결과를 통해 홀 추력기의 방전 시뮬레이션의 정확성을 높이는 동시에 실제 시스템의 이해에 기여할 것으로 예상되어 진다. Neutral gas in a Hall-effect thruster in a small satellite is simulated using a molecular dynamics code. Investigated are neutral density, pressure, axial average velocity, and temperature for the variation of diffusive reflection ratio, initial gas temperature, and channel length. Expected through this research are improving of discharge simulation through the neutral simulation and understanding of real system.
황상윤(Shang-Yoon Hwang),이호준(Ho-June Lee),박기환(Ki-Hwan Park) 한국유체기계학회 2003 유체기계 연구개발 발표회 논문집 Vol.- No.-
As the fastest growing flowmeter technology, multi-path ultrasonic flow-meters are gaining wider range in petroleum industry for liquid hydrocarbon custody transfer measurement. This paper describes the mult-path ultrasonic flowmeter, URO-Ex1000 the requirements necessary to prove and test in Korea & China. URO-Ex1000 haver a good results with accuracy range, but a little exceed with repeatability.
Electron-beam Evaporation의 증착 방법에 따른 MgO Layer의 표면 특성에 관한 연구
허정은,이돈규,조성용,이해준,이호준,박정후,Heo, Jeong-Eun,Lee, Don-Kyu,Cho, Sung-Yong,Lee, Hae-June,Lee, Ho-Jun,Park, Chung-Hoo 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.5
A MgO layer is used as electrode protective film in the alternating current plasma display panel (AC PDP). The properties of MgO layer are thought to be one of the most important factors that affects the panel reliability through the firing voltage variation. In this study, we investigated the relations between the surface characteristics and e-beam evaporation process parameters such as deposition rate, temperature of substrate and distance between the MgO pellet and substrate. To produce the MgO layer of (200) crystal orientation, we suggest the high temperature of the substrate, the long distance between the pellet and substrate and the high deposition rate.