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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.
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.
고속전철 객실의 공기 분배 및 기류에 관한 수치해석적 연구
명현국,유경훈,황정호,Myong, Hyon-Kook,Yoo, Kyung-Hoon,Hwang, Jungho 한국입자에어로졸학회 2019 Particle and Aerosol Research Vol.15 No.1
Numerical analysis has been conducted on three-dimensional airflow distribution in the passenger cabin of a high-speed electric train. The types of air distribution systems investigated in the present study were those of TGV and Shinkansen. The Reynolds-averaged Navier-Stokes equations governing the mass and momentum conservations of the airflow in the cabin were solved by using a finite volume method, which are coupled with the standard $k-{\varepsilon}$ turbulence model equations. Predicted velocity distributions were presented on several selected planes in the passenger cabin. The present three-dimensional simulations were found to show the overall features of the airflow in the passenger cabin fairly well. In particular, it was shown that the type of air distribution for Shinkansen was more suitable for a non-smoking cabin than that for TGV.
대용량 입자 발생 장치 개발 및 이를 이용한 항바이러스 공조용 공기필터 제조
박대훈,조윤행,황정호,Park, Dae Hoon,Joe, Yun Haeng,Hwang, Jungho 한국입자에어로졸학회 2016 Particle and Aerosol Research Vol.12 No.4
Since airborne viruses have been known to aggravate indoor air quality, studies on development of anti-viral air filter increase recently. In this study, a mass aerosol particle generator for coating a commercial air filter (over $300{\times}300mm^2$) was built, and evaluated by comparing a commercial particle generator. Then, via this device, a commercial air filter was coated with anti-viral material ($SiO_2-Ag$ nanoparticles in this study), so fabrication of commercial anti-viral air filter was performed and the pressure drop, filtration efficiency, and anti-viral ability of the filter were evaluated against aerosolized bacteriophage MS2 in a continuous air flow condition. The result showed that the particle generation of the new generator was more than about 8.5 times over which of the commercial one. Consequently, $SiO_2-Ag$ particle coating on a filter does not have significant effects on the filtration efficiency and pressure drop with different areas, and the average anti-viral efficiency of the $SiO_2-Ag$ filter was about 92% when the coating areal density was $1.0{\times}10^{12}particles/m^2$.
실내 공간에서의 호흡기 감염병 공기전파감염 위험도와 공기정화장치(필터 임배디드 기계식 환기설비 및 공기청정기 등 실내 감염원 저감 장치) 사용에 따른 효율
박성재,박근영,박대훈,구현본,황정호,Park, Sungjae,Park, Geunyoung,Park, Dae Hoon,Koo, Hyunbon,Hwang, Jungho 한국입자에어로졸학회 2020 Particle and Aerosol Research Vol.16 No.4
Particulate infectious sources, including infectious viruses, can float in the air, causing airborne infections. To prevent indoor airborne infection, dilution control by ventilation and indoor air cleaners are frequently used. In this study, the risk of airborne infection by the operation of these two techniques was evaluated. In case of dilution control by ventilation, a high efficiency air filter was embedded at the inlet of supply air. In this study, infectious source reduction devices such as indoor air cleaner include all kinds of mechanical-filters, UV-photo catalysts and air ionizers through which air flow is forced by fans. Two mathematical models for influenza virus were applied in an infant care room where infants and young children are active, and the risk reduction efficiency was compared. As a result, in the case of individually operating the ventilator or the infectious source reduction device, the airborne infection risk reduction efficiencies were 55.2~61.2% and 53.8~59.9%, respectively. When both facilities were operated, it was found that the risk of airborne infection was reduced about 72.2~76.8%. Therefore, simultaneous operation of ventilation equipment and infectious source reduction device is the most effective method for safe environment that minimizes the risk of airborne infection of respiratory infectious diseases. In the case of a space where sufficient ventilation operation is difficult, it was found that the operation of an infectious source reduction device is important to prevent the spread of infectious diseases. This study is meaningful in that it provides an academic basis for strategies for preventing airborne infection of respiratory infectious diseases.