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CFD를 이용한 광촉매 정수장치모듈의 최적구조 국문제목
강한용,최병철,김종호 한국공업화학회 2004 응용화학 Vol.8 No.1
The flow fields inside the photo-catalytic module for water treatment system were studied. The fluid flow inside the module was visualized mainly by CFD (computer fluid dynamics) analysis, and the numerical analysis was authorized by PIV(particle image velocimetry) measurement. The flow patterns in the module for 3 types of innards and 6 kinds of flow rate were analyzed by CFD. Model 1 had better performance below 0.1 L/s of the flow rate, and model 2 over 0.2 L/s of the flow rate with the homogeneous flow field innards of photo-catalytic module.
저온에서 정방형 공간내 성층화된 유체의 열적거동에 관한 실험적 연구
강한용,이동석,김병철 대한설비공학회 2000 설비공학 논문집 Vol.12 No.4
An experimental study on the stratified fluids was carried out to investigate the flow characteristics, heat transfer through the interface of fluids, and the applications of thermal behaviors in the square cavity. The same volume of water and silicon oil was filled in it. The experiments were performed with the variations of initial temperatures and cooling surface temperatures. And the effect of vertical or horizontal cooling surface positions in the square cavity was investigated. When the cooling surface temperatures were $-4^{\circ}C$ , the supercooling phenomena were observed for both cases of cooling surface positions in the full region regardless of the initial temperature of fluid. In the square cavity with horizontal cooling surfaces, the lower the initial temperatures were, the longer the supercooling durations were, and with vertical cooling surface the lower the initial temperatures were, the shorter the supercooling durations were.
저온 플라즈마-광촉매장치용 SIC 담체-촉매의 카본 산화특성
최병철(Byungchul Choi),강한용(Hanyong Kang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
PM oxidation behavior of some kinds of catalysts that were coated on the SiC substrate were investigated for Non-Thermal Plasma Discharge- Photocatalyst(NTPDP) system. The catalyst samples were prepared with double layer coating method that consisted of the P25(photocatalyst, bottom layer) and metal additives(upper layer). Carbon(Printex-U) as diesel soot was coated on the SIC honeycomb monolith with catalyst. P catalyst was observed better behavior to complete carbon oxidation in non application of the NTPDP system, and Ni catalyst was better at partial oxidation at same condition. Ni catalyst had some advantageous that carbon oxidation effectively oxidized at 250℃ and NOx reduction was reached about 15~20% at 370℃ in application of the NTPD. Moreover Ni catalyst provides stable operation of the NTPDP system. The SIC substrate has a good thermal durability that it can endures an arc discharge during transient plasma discharge.
인터넷 개인방송의 지불 행위에 영향을 미치는 요인에 관한 연구: 중국 1인 방송의 이용자 개인 특성, BJ의 특성, 그리고 플랫폼 특성을 중심으로
제흔원,김용환 동국대학교 사회과학연구원 2019 사회과학연구 Vol.26 No.4
This study amis to discover what factors influence internet personal broadcasting users' gift payment behaviors. Specifically, this study examines how users' personal characteristics, perceived BJ's characteristics, and perceived characteristics of the platform influence the frequency and the amount of internet personal broadcasting users' gift payment. Firstly, the results showed that, among the three factors of users' personal psychological characteristics, conformity has a positive influence on users’ gift payment behaviors. All of the four factors of BJ's characteristics had no significant relationship with thegift payment. As for the six factors of characteristics of platform, 'interactions with BJ' and 'HCI utility' had statistically significant influences on users’ gift payment behaviors. To put it shortly, with more conformity, interaction with BJ and HCI utility, internet personal broadcasting users were more likely to pay more for the gift and do it more often. In terms of the magnitudes of factors influencing the users’ payment frequency, conformity had the strongest influence, followed by interactions with BJ and HCI utility. As for the amount of payment, it turned out that conformity, HCI utility and interaction with BJ had significant influences in order. Conformity had the greatest influence on both the frequency and amount of gift payment. Interactions with BJ had a greater influence on the frequency of payment while HCI utility has more on the amount of user’s gift payment. 본 연구는 어떠한 변인들이 인터넷 개인방송 이용자들의 별풍선 지불행위에 영향을 미치는지에 대해서 알아보고자 한다. 구체적으로 시청자 개인의 특성, BJ의 특성 그리고 플랫폼의 특성이 인터넷 개인방송 이용자들의 별풍선 구매빈도와 구매액수에 어떻게 영향을 끼치는지 살펴보았다. 이를 위해 인터넷 개인방송을 시청하는 중국인들을 대상으로 온라인 설문조사를 실시했다. 분석 결과, 개인의 심리적 특성 중 동조성이—즉, 다른 시청자의 별풍선 구매행위를 보고 이에 동조하고 싶을수록— 지불행위와 긍정적인 관계를 가지는 것으로 나타났다. 시청자가 느끼는 BJ의 전문성, 매력, 커뮤니케이션 능력, 유머감각 등 네 가지 BJ의 특성모두 별풍선 지불행위와 유의미한 관계를 가지지 않는 것으로 밝혀졌다. 플랫폼의 특성 요인 중에서는 BJ와의 상호작용과 HCI 유용성이 지불행위에 통계적으로 유의미한 관계를 가지는 것으로 밝혀졌다. 요약하자면, 동조성이 높고 BJ와 상호작용성이 높을수록, 지각된 HCI 유용성이 높을수록, 이용자는 별풍선을 더 자주, 더 많이 구매하는 것으로 나타났다. 각 요인의 영향력을 순서대로 나열하면 월(月)구매빈도에 대해서는 동조성, BJ와 상호작용성, HCI 유용성 순으로 나타났으며, 구매액수에 대한 영향력은 동조성, HCI 유용성, BJ와 상호작용성 순으로 나타났다. 두 결과 모두 동조성이 가장 큰 영향을 미치고 있고, 월구매빈도에는BJ와 상호작용성이 HCI 유용성보다 영향력이 더 크지만, 구매액수에는 HCI 유용성이 BJ와 상호작용성보다 영향력이 더 큰 것으로 밝혀졌다.
디젤 연료의 황농도에 따라 배출되는 입자상물질의 산화촉매에서 반응특성
김화남(Hwanam Kim),성용하(Yongha Sung),정길성(Kil Sung Jung),강한용(Hanyong Kang),최병철(Byungchul Choi),임명택(Myung Taeck Lim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel particulate matters are one of a major harmful component of the emission under strict regulations. Diesel oxidation catalyst (DOC) is using to reduce hydrocarbon and carbon monoxide in current diesel engines. The objectives of this study are to further understand the formation characteristics of nano-particles in nuclei mode, for the purpose we examined formation of nano-particle with various sulfur concentrations in diesel fuel in both of a common-rail diesel engine and a boiler for household heating equiped with DOC. Experimental parameters adopted equivalence ratio, dilution air temperature, fuel injection pressure and engine speed. The particle size distribution and the number concentration were measured by SMPS. PM nano-particle number in boiler exhaust gas was increased by diesel fuel with 500 ppm sulfur, and when the exhaust gas temperature is more than 300℃, the particles range of 20 to 40 ㎚ increased greatly in the rear of the DOC. Number of the particle smaller than 30 ㎚ size increased as the sulfur concentration in the diesel fuel increased in the common-rail diesel engine.