http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Contamination Control Technology for Semiconductor Manufacturing Processes
Hwang, Jungho,Byeon, Jeonghoon 호서대학교 반도체제조장비국산화연구센터 2002 Workshop 자료집 Vol.2002 No.2
■ Outside air cleaning - Sub micron and nano particle control technologies (electric vs. non-electric) - AMC Source Control (gaseous pollution control) - In situ and real time contaminants detecting system ■ Inside air cleaning - HEPA & ULPA Filters for CFM - Chemical Filter for AMC control - Outgassing-free Material - CFM process
Hwang, In Sik,Jeong, Hyo Jae,Hwang, Jungho Elsevier 2019 Powder technology Vol.356 No.-
<P><B>Abstract</B></P> <P>In this study, the dense flow characteristics in a Lapple cyclone were investigated using numerical simulations. At a high solid volume fraction, four-way coupling must be applied to account for solid volume fraction in Navier-Stokes equations and particle-particle collisions, which are not considered in one- and two-way couplings approaches. A four-way coupling method, the dense discrete phase model (DDPM), which accounts for the solid volume fraction, was used in this study. The kinetic theory of granular flow (KTGF) in the DDPM was utilized to compute particle-particle interactions. The calculated results obtained using DDPM-KTGF were validated using experimental results reported previously. These results were compared with numerical data obtained from the discrete element model (DEM), which is another four-way coupling method. DDPM-KTGF could be successfully applied to situations involving high solid volume fractions with a significantly lower computational time than that required for DEM.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CFD simulation was carried out for a dense flow cyclone. </LI> <LI> The CFD results were in good agreement with experimental data and DEM. </LI> <LI> The particle accumulation near the bottom of the cyclone was clearly observed. </LI> <LI> A higher SLR is not appropriate for stable operation of the cyclone. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
초음파피로시험법을 이용한 엔지니어링 플라스틱(POM)의 내구성평가
황정호(JungHo Hwang),오주연(JooYeon Oh),김현창(HyunChang Kim),오세훈(SaeHoon Oh),조인식(InSik Cho),이창순(ChangSoon Lee),박인규(InGyu Park) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Due to the extensive long service life for automotive components, the behavior of very high cycle fatigue(VHCF) is gained attention. For this reason, the newly developed piezoelectric ultrasonic fatigue test (UFT) system by Mbrosiatec Co. Ltd<SUP>1</SUP> is used to investigate the high cycle fatigue (HCF) strength of Engineering Plastic(EP). The plate-shaped specimens are investigated in the range of 10<SUP>6</SUP> to 10<SUP>9</SUP> cycles at room temperature under completely reversed loading conditions R=-1. Scanning electron microscopy(SEM) analysis revealed that failures occur right up to the high cycle regime, with the fractures being found to initiate from the surface unlike in EP. In addition, SEM micrographs showed that micro-dimples were transformed. Additionally, this test method can be applicable on commercialized parts of automotive and rail road which are required high cycle fatigue. In addition, SEM micrographs showed that micro-dimples were transformed into EP fracture.
황정호(Jungho Hwang),이서용(Seoyong Lee),박현수(Hyunsoo Park) SBS 2012 미디어경제와 문화 Vol.10 No.1
본 연구는 올림픽이라는 인류의 축제가 TV 광고 시청률에 영향을 줄 것이라는 것을 전제로, 과연 얼마나 TV 광고 시청률을 상승시키는지 그리고 지상파TV에서 단독 또는 공동으로 중계하는 상황에 따라 광고시청률이 어떻게 달라지는가를 규명하고자 하였다. 분석에 사용된 올림픽 중계는 각각 밴쿠버(단독 중계)와 베이징(공동 중계) 올림픽이었으며, 당시 시청률 자료를 TNmS에서 제공받아 실증적인 분석 결과를 제시하였다. 연구 결과, 올림픽 단독 중계는 광고 효과에 긍정적인 영향을 주고 있었으며 설정된 가설들에서 의미 있는 차이가 발견되었다. 또한 단독 중계의 효과는 공동으로 중계했을 때보다 더욱 크다는 결과도 발견되었다. 단독 중계의 경우 공동 중계보다 광고 시청률이 더욱 높았으며, 이러한 차이는 성별과 연령에 따라서도 다르게 나타났다. 또한 광고의 효율성에 있어서도 올림픽 중계의 이점이 크다는 결과가 도출되었다. This study is based on a premise that the world festival of Olympic games will affect the audience ratings of TV advertising. It aims to examine how much it increases the ratings of TV advertising and also how the ratings differ from the situations of a TV’s exclusive broadcasting and co-broadcasting. The broadcastings of Olympic games used for this research were Vancouver Olympic games(exclusive broadcasting) and Beijing Olympic games(co-broadcasting). The rating data of those were provided from TNmS, a research company in Korea, and useful results are suggested in terms of advertising exposure effects and cost efficiency. The results show that exclusive broadcasting of Olympic games had more positive effects on advertising than those of co-broadcasting. In exclusive broadcasting, the advertising ratings were higher than those of co-broadcasting. The differences were also distinguished by audience gender and age. Also, concerning advertising cost efficiency, it was found that the merits of broadcasting Olympic games were significant.
황정호(Jungho Hwang),노지훈(Jihoon Roh),박기홍(Kihong Park) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.7
The demand for the metal coil coated with reflective film is rapidly increasing with the increasing demand of notebook PCs and LCD monitors. During the coating process, it is very important to regulate tension of the coil metal since fluctuation of the tension can significantly degrade quality of the product. In this study, a tension controller has been developed for winding process of LCD reflective film coating. The controller has been tested on the existing coating facilities, and the results are to be given in this paper.
하이브리드 자동차의 모드 변환 엔진클러치 과도상태 분석과 토크 제어에 관한 연구
황현수(Hyunsoo Hwang),김상우(Sangwoo Kim),양동호(Dongho Yang),홍정호(Jungho Hong),김현수(Hyunsoo Kim),황성호(Sungho Hwang) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
2-shaft parallel hybrid electric vehicle(HEV) drive train changes driving mode electric vehicle(EV) mode to HEV mode with a engine clutch. There is a torque variation that causes a driver discomfort. In this paper, Cosimulation environment that is HEV drive train modeled with AMESim in detail to describe a torque variation, and controller developed with MATLAB/Simulink is developed. To reduce discomfortable torque variation, Engine torque strategy before engine clutch engaged, and motor torque strategy after driving mode is changed, and the strategy using engine and motor torque strategy are proposed.