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선회충돌제트에 의한 배열 칩의 열전달 특성에 관한 실험적 연구
최재욱,전영우,정인기,박시우 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.4
The experimental study on heat transfer characteristics of protruding heated block array as conducted to investigate and to compare the performance of impinging single circular jet in fully developed tube with a twisted tape as a swirl generator. The effects of jet Reynolds number(Re=8700, 13800, 20000. 26500), dimensionless jet-to-block distance(H/d=1. 3, 5. 7) and swirl number(S=0.11, 0.23, 0.30) of the swirl jet on the average Nusselt number for each block and all blocks have been examined. Measurements of heat transfer rate on block surfaces were used naphthalene sublimation technique. Mean velocity and turbulence intensity of the jet along the axis were measured. Potential core length of the jet was 5 times of nozzle diameter because it was fully developed and initially turbulent. With the twisted tape in the nozzle, heat transfer coefficients were higher than those without the twisted tape. which are mainly caused with increasing the jet Reynolds number and swirl number.
최재욱,목연수,박승호 한국안전학회 2001 한국안전학회지 Vol.16 No.5
Explosive characteristics of the city gas were determined by using the gas explosion apparatues. The explosive range is determined between lower explosive limit of 5.0% and upper explosive limit of 15.3% at atmosphere and even though the oxygen concentration is decreased, lower explosive limit is not changed, but upper explosive limit is rapidly decreased. The minimum oxygen for combustion is determined 10%. The maximum explosion pressure is determined 5.72$\textrm{cm}^2$ and the maximum rate of explosion pressure rise is oxygen concentration of 12% to determined 160.12$\textrm{cm}^2{\cdot}$sec.
최재욱,이애경,김경희,서명순,백지원,김남,최형도 한국전자파학회 2020 한국전자파학회논문지 Vol.31 No.10
In this study, we investigated the change in risk perception of the electromagnetic field (EMF) in the general population, and presented the public psychological properties of EMF exposure from various sources through a two-dimensional risk cognitive map. The risk perception of EMF increased or decreased according to environmental factors. In the risk cognitive map, radars and 5G base stations were distributed in areas of high dread and uncontrollability. On the other hand, household appliances, including hair dryers and microwave ovens, were distributed in areas where dread was high but could be controlled. Therefore, for household appliances that can be controlled, perceived risk should be lowered by resolving public questions. For involuntary exposures that cannot be controlled individually, a risk communication strategy that includes sufficient explanation and understanding through participation programs is required.