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최선묵(Sun-Muk Choi),손창효(Chang-Hyo Son),이동건(Dong-Gun Lee),김영률(Young-Lyul Kim),오후규(Hoo-Kyu Oh) 한국마린엔지니어링학회 2004 한국마린엔지니어링학회 학술대회 논문집 Vol.2004 No.-
The evaporative heat transfer characteristics of carbon dioxide in a horizontal tube investigated experimentally. The experiments were conducted without oil in a closed refrigerant loop which driven by a magnetic gear pump. The main components of the experimental facility are a magnetic gear pump, a receiver, a mass flow meter, a pre-heater and evaporator(test section). The test section is a stainless steel tube of 7.75mm in I.D. and 5000mm in length, which was heated by an electric coil heating method. The experiment were conducted at mass flux of 200 to 400kg/㎡s, saturation temperature of -5℃ to 5℃, and heat flux of 10 to 30kW/㎡. The test result presents the evaporative heat transfer coefficient of carbon dioxide decreases as vapor quality increases. For all the experimental conditions, the heat transfer coefficient of carbon dioxide has an effect on more heat flux than mass flux. In comparison with test results, existing correlations failed to predict the evaporative heat transfer coefficient of carbon dioxide, therefore, it is necessary to develope reliable and accurate methods determining the evaporative heat transfer coefficient of CO₂ in a horizontal tube.
박승배(Seung Bae Park),최선묵(Sun Muk Choi) 한국경영학회 2011 Korea Business Review Vol.15 No.1
시보광고 시장이 성장하고 실제로 다양한 시보광고(time check advertising)가 나타나고 있음에도 불구하고 시보광고 효과에 대한 연구는 미흡한 실정이다. 특히, 시보광고가 일반광고에 비해 광고효과가 낮다는 연구들에서는 선택적 주의(selective attention)에 의해 광고효과가 저하된다고 주장하고 있지만 이를 극복하기 위하여 선택적 주의 효과를 극복할 수 있는 방안에 대한 연구는 부족하다. 이에 본 연구에서는 과연 시보광고가 일반광고에 비해 효과가 있는지 여부를 살펴보고 브랜드 파워에 따라 시보광고의 효과가 어떻게 달라지는지 그 조절적 역할을 살펴보았다. 이를 위해 2(시보광고: 일반광고) X 2(브랜드 파워가 강한 브랜드: 브랜드 파워가 약한 브랜드) 집단간 실험설계(between-subjects factorial design)를 적용하여 가설을 검증하였다. 분석결과, 기존의 연구와 마찬가지로 시보광고는 일반광고에 비해 그 효과가 떨어지는 것으로 나타났다. 즉, 브랜드 파워가 강한 브랜드의 시보광고나 브랜드 파워가 약한 브랜드의 시보광고 모두 일반광고에 비해서는 광고효과가 낮다. 그러나 시보광고와 브랜드 파워 간에 유의한 상호작용효과가 나타났다. 즉, 브랜드 파워가 큰 브랜드는 광고회상에서 일반광고에 비해 시보광고의 광고효과가 떨어지지만 브랜드 파워가 약한 브랜드일 경우 광고회상에서 일반광고보다 시보광고의 광고효과가 크게 나타났다. 이러한 결과에 대한 이론적이고 실무적인 시사점을 논의하였다. Although the spread of ``Time Check Advertising`` in all kinds of Advertising, A study related to time check advertising not has been in spotlight as an important research domain. Therefore this study investigates how the effect of time check advertising is, and moderated by brand power. We test specific hypotheses, using 2(advertising type: general advertising vs. time check advertising) X2(Brand Power: strong brand vs. weak brand) between-subjects factorial design. The results indicate that there is not more effective time check advertising than general advertising. That is, the effect of advertising is greater on general advertising than time check advertising. Also, the results show that there is a significant interaction effect between adversing type and brand power. That is, time check advertising is more effective than general advertising on weak brand. However general advertising is more effective than time check advertising on strong brand.
장승일(Seong-Il Jang),최선묵(Sun-Muk Choi),김대희(Dae-Hui Kim),오후규(Hoo-kyu Oh) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
The experiments were conducted without oil in a closed refrigerant loop which was driven by a magnetic gear pump. The main components of the refrigerant loop are a receiver, a variable-speed pump, a mass flow meter, a pre-heater and evaporator(test section). The test section was made of a horizontal stainless steel tube with the inner diameter of 4.57 ㎜, and length of 4 m. The experiments were conducted at mass flux of 200 to 700 ㎏/㎡s, saturation temperature of 0℃ to 20℃, and heat flux of 10 to 30 ㎾/㎡. The test results showed the evaporation heat transfer of CO₂ has great effect on more nucleate boiling than convective boiling. The evaporation heat transfer coefficients of CO₂ are highly dependent on the vapor quality, heat flux and saturation temperature. In comparison with test results and existing correlations, correlations failed to predict the evaporation heat transfer coefficient of CO₂, therefore, it is necessary to develop reliable and accurate predictions determining the evaporation heat transfer coefficient of CO₂ in a horizontal tube.