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배효준,이상재,서영백,박흥식,Bae, H.J.,Lee, S.J.,Seo, Y.B.,Park, H.S. 한국기계가공학회 2002 한국기계가공학회지 Vol.1 No.1
High speed machining system have been used in industrial because it is effective to a material manufacturing with various shape. Recently the end-milling processing is needed the high-precise technique with good surface roughness and rapid time in aircraft, automobile part and molding industry. Therefore this study proposed to decide best manufacturing cutting condition for surface roughness and rapid manufacturing tune by using computer Image processing system and 3D modelling. Until the 16,000 rpm, the surface roughness is decreased rapidly, but it is not over that. The 22,000 rpm is the spindle speed with the optimum surface in the high speed end-milling. In the case of the feed rate with 2,000 mm/mm and 8,000 mm/mm, the surface roughness is better than 4,000 mm/min and 6,000 mm/min. By using the 3D modelling, it is effectively represented shape characteristics of working surface m high speed end-milling.
배효준,양신일,정택범,양아련,차동현,이길,이화영,변도성,김백민 한국기상학회 2022 Asia-Pacific Journal of Atmospheric Sciences Vol.58 No.3
We investigated the strengthened ocean surface heat flux at Ieodo Ocean Research Station (Ieodo ORS) during the passage of Typhoon Lingling. On September 6, 2019, when Typhoon Lingling approached the Ieodo ORS, we observed a dramatic drop in the sea surface temperature (SST) of 5.0 °C along with intense turbulent mixing. Although the decline of the SST was much weaker than the observed data, the SST simulated by the regional air-sea coupled model exhibited a decrease of about 2.0 °C in a few hours due to turbulent mixing by current shear. At the same time, the latent heat flux showed a robust downward transfer. We also investigated the case with the air-sea coupled model and atmosphere-only model, but this negative latent heat flux was not captured. The sensible heat flux was better captured by the coupled model than the uncoupled model. And the coupled model simulated the latent heat flux closer to downward than the uncoupled model. We conducted a sensitivity test by altering the flux estimation methods used to estimate ocean heat fluxes. We found that the latent heat flux was more sensitive to the choice of estimation and showed much room for improvement. In this regard, the joint model-observation study using Ieodo ORS data provides an invaluable opportunity for improved typhoon simulation.
배효준,이상재,서영백,박흥식,전태옥 동아대학교 생산기술연구소 2002 生産技術硏究所硏究論文集 Vol.7 No.1
High speed machining system have been used in industrial, because it is effective that a material manufactured with various shape. Recently a end-milling processing is need the high-precise technique with good surface roughness and rapid time in aircraft industry, automobile part and molding. Therefore this study proposed to decide best manufacturing cutting condition for surface roughness and rapid manufacturing time by using computer image processing system and 3D modeling. Until the 16,000 rpm, the surface roughness is decreased rapidly, but it is not over that. The 22,000 rpm is the spindle speed with the optimum surface in the high speed end-milling. In the case of the feed rate with 2,000 mm/min and 8,000 mm/min, the surface roughness is better than 4,000 mm/min and 6,000 mm/min. By using the 3D modeling, it is effectively represented shape characteristics of working surface in high speed end-milling.
배효준,오재호 한국기상학회 2017 Asia-Pacific Journal of Atmospheric Sciences Vol.53 No.3
A method was developed to estimate a synthetic precipitation record for ungauged sites using irregular coarse observations. The proposed synthetic precipitation data were produced with ultrahigh hourly resolution on a regular 1 × 1 km grid. The proposed method was used to analyze selected real-time observational data collected in South Korea from 2010 to the end of 2014. The observed precipitation data were measured using the Automatic Weather System and Automated Synoptic Observing System. The principal objective of the proposed method was to estimate the additional effects of orography on precipitation introduced by ultrahigh- resolution (1 × 1 km) topography provided by a digital elevation model. The Global Forecast System analysis of the National Centers for Environmental Prediction was used for the upper-atmospheric conditions, necessary for estimating the orographic effects. Precipitation data from 48 of the more than 600 observation sites used in the study, which matched the grid points of the synthetic data, were not included in the synthetic data estimation. Instead, these data were used to evaluate the proposed method by direct comparison with the real observations at these sites. A bias score was investigated by comparison of the synthetic precipitation data with the observations. In this comparison, the number of Hit, False, Miss, and Correct results for 2010-2014 was 74738, 25778, 7544, and 367981, respectively. In the Hit cases, the bias score was 1.22 and the correlation coefficient was 0.74. The means of the differences between the synthetic data and the observations were 0.3, −3.9, −14.4, and −34.9 mm h−1 and the root mean square errors (RMSEs) were 2.7, 8.3, 19.3, and 39.6 mm h−1 for the categories of 0.5-10.0, 10.0- 30.0, 30.0-50.0, and 50.0-100.0 mm h−1, respectively. In addition, in each range, the 60% difference between the synthetic precipitation data and the observation data was −1.5 to +1.5, −5.0 to +5.0, −17.0 to +17.0, and −33.0 to +33.0 mm h−1, respectively. Overall, the correlation coefficient of the synthetic precipitation data was > 0.7 for 43 of the 48 test stations and the RMSE was < 4 mm h−1 at 31 stations. The results are significant at all evaluation stations at the 0.05 significance level.