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김민경(Min Kyoung Kim),구경민(Kyung Min Koo) 한국농식품정책학회 2013 농업경영정책연구 Vol.40 No.3
This study analyzes the impact of external shock, FMD (foot-mouth-disease), on both long- and short- run relationship among pork prices in marketing channel. The data employed in this study are price paid by framers, wholesale price, consumer price of the period from January 1997 to December 2012, which includes FMD outbreaks in the years of 2000, 2002, 2010 and 2011. Two different methods were employed to analyze the (non)stationarity of data: (1) ADF, PP, and KPSS without considering FMD impact and (2)Zivot-Andrews test and Lee-Strazicich test to consider FMD impact. The pork prices were found to be nonstationary and FMD did not significantly affect nonstationarity of the data. Johansen cointegration test, VECM (vector error correction model) and Ganger-causality tests were conducted to examine the long- and short-run relationship among the prices when external shock, FMD, occurred. In the short-run relationship, wholesale price played a leading role, as was confirmed in other studies. In the long-run, however, consumer prices played a leading role affecting prices paid by farmers and wholesale prices. This might be due to both Handon and pork industries have been changing to adopt the needs for consumers and the importance of marketing channel in dealing with uncertainty.
세척이 가능한 원통 코일형 열교환기의 파울링 특성에 관한 연구
황준현(Jun Hyeon Hwang),나병철(Byung Chul Na),오세기(Sai Kee Oh),구경민(Kyoung Min Koo),이재근(Jae Keun Lee),안영철(Young Chull Ahn) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.2
In this work, we studied the shell and helically coiled tube heat exchangers. Shell and coil heat exchangers with different rate of water flow and plate heat exchanger with same capacity were tested for condensing conditions. We proposed design guide using modified Wilson plot method. We compared fouling characteristics between shell and coil heat exchanger and plate heat exchanger, when they were washed and were not washed. The shell and coil heat exchanger showed 120% of higher saturated fouling resistance value and 4% of better heat transfer ratio than the plate heat exchanger.