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박창용 대한설비공학회 2015 International Journal of Air-Conditioning and Refr Vol.23 No.4
A review study was performed for basic heat transfer mechanism and quantitative analysis of correlations for flow boiling heat transfer in micro-scale channels. Several criteria for determining threshold diameter for micro-scale channels were discussed and the concept of confinement number was commented. The distinctive feature of flow boiling in micro-scale channels were considered and it was found out that the effect of the heat flux, latent heat, viscous force, surface tension, and inertial force was more significant. Important dimensionless parameters were summarized and it was pointed out that the boiling number, capillary number, and Weber number could be expected to play important roles at flow boiling in micro-scale channels. 17 correlations for flow boiling in micro-scale channels were reviewed in this study, and they were categorized by three types of correlations such as an equivalent Nusselt number correlation, a correlation with superposition of nucleate and convection boiling mechanism, and a flow patternbased correlation. The predicted values by the correlations were compared with 536 experimental data from four different literatures and a correlation with smallest prediction errors was found. Some correlations showed distinct trends of convection heat transfer coefficient (h) change with respect to the variation of vapor quality. The trends are categorized by three trends such as noticeable increase of h with the increase of vapor quality and significant continuous decrease after dryout point, minor increase and decrease or decrease and increase of h, and gradual and continuous decrease of h with the increase of vapor quality. For each trend of h change, recommendable correlations and their basic equation forms were proposed to compare the prediction results with experimental data or to develop a new correlation by modifying existing correlations.
박창용,홍아름 대한건설보건학회 2020 대한건설보건학회지 Vol.2 No.1
Purpose: This study was attempted to provide the necessary data for Vietnamese companies to succeed in adapting to the local market by investigating the level of awareness of the Occupational Safety and Health Act and the work environment evaluation for local workers in Vietnam. Methods: This study is a descriptive study to investigate the perception of local workers in Vietnam on the Occupational Safety and Health Act and the work environment evaluation system. Results: As a result of the awareness survey on the Occupational Safety and Health Act and the work environment evaluation system in Vietnam, the average level of awareness of laws, legal regulations, fines for actions taken, work environment evaluation, occupational diseases, safety protection equipment, and hazardous chemical substances was surveyed high. Conclusion: Reviewing Korea’s leading Occupational Safety and Health Act and gradually applying them to Vietnam’s industrial sites will contribute to the development of the safety and health cooperation system between the two countries and enhancing the global competitiveness of Korean companies that have advanced.
한국형 관광기후지수를 이용한 우리나라 관광기후환경 변화에 관한 연구
박창용,김남조,김상태,최영은,김민기 건국대학교 기후연구소 2015 기후연구 Vol.10 No.3
This study aimed at examining the changes of time series and spatial pattern s of tourism climatic conditions using Korea Tourism Climate Index (KTCI) of South Korea. Spatial patterns of KTCI represent climate characteristics in all seasons of South Korea,. KTCI also shows which tourism climate condition inappropriately (appropriately) shows the changes of tourism activity in the summer (winter) season in response to the global warming. KTCI is therefore expected to be a more suitable index than TCI (Tourism Climate Index) when it comes to the incorporation of the global warming into the index. KTCI can also be used for improving the future prediction about tourism climate conditions and provide useful information for the establishment of countermeasure strategies for climate change.
박창용,황정욱,안수현,안희준 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
We have fabricated dicyanopyrazine-linked porphyrin mono and multilayer films on polycrystalline gold and quartz substrates using the Langmuir-Blodgett (LB) technique. Two different porphyrins were studied, one with two and the other with four positions of the porphyrin ring substituted with the dicyanopyrazine containing moiety (desig nated 2-DCPP and 4-DCPP, respectively). XPS indicates that the atomic ratios of C, N, and O for the LB films are similar to the theoretical ratios for the dicyanopyrazine-linked porphyrins. AFM reveals that the surface roughness of LB multilayers are higher than that of the LB monolayers due to aggregation of the porphyrin molecules in the multilayer films. The 11-multilayer LB films are only 6 and 4.6 times thicker than the monolayer LB films. This result is consistent with the surface roughness data showing aggregation of dicyanopyrazine-linked porphyrin in multilayer LB films. UV-vis spectroscopy indicates a blue shift of the Q band of the LB films compared with the dicyanopyrazine-linked porphyrin solution due to interaction between stacked porphyrin rings.
박창용,Park, Chang-Yong 대한설비공학회 2011 설비저널 Vol.40 No.6
콜드체인(cold chain)의 최종단계로 제품과 소비자를 연결시키는 냉동/냉장 쇼케이스는 대형마트나 슈퍼마켓의 대표적인 에너지 다소비 기기이다. 쇼케이스가 소비하는 에너지를 감소시키는 기술은 오랫동안 관련 엔지니어들의 관심 대상이었다. 본 원고에서는 ASHRAE Journal에 게재되었던 냉동/냉장 쇼케이스의 에너지 절약 및 회수에 관한 북미의 연구사례를 소개하고자 한다.