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박정선 한국전문가시스템학회 1996 학술대회 Vol.2 No.1
In this study, the performance of the Classification and Regression Tree(CART) is compared with that of the discriminant analysis method. In most experiments using bank data, discriminant analysis shows better performance in terms of the total cost. In contrast, most experiments using insurance data show that the CART is better than discriminant analysis in terms of the total cost. The contradictory results are analyzed by using the characteristics of the data sets. The performances of both the Classification and Regression Tree and discriminant analysis depend on the parameters: failure prior probability, data used, type I error cost, type II error cost, and validation method.
박정선,김봉수,문영미,김길하,홍기정,양정오 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.10
쌀에 발생하는 해충인 머리대장가는납작벌레를 대상으로 포스핀 훈증제 감수성 평가를 수행하였다. 머리대장가는납작벌레 알, 후기유충 및 성충을 대상으로 수행하였으며, 포스핀은 0.025, 0.051, 0.099, 0.501 및 0.999 mg/L 5개농도를 20시간 동안 처리하였다. 그 결과, 머리대장가는납작벌레 알은 0.025 mg/L에서 46.5%의 살충률을 보였고0.999 mg/L에서는 100.0%의 높은 살충률을 확인하였다. 후기유충과 성충은 0.099 mg/L 농도에서 각각 98.9, 94.4%의살충률을 보였으나, 0.501 mg/L 처리시에는 후기유충 및 번데기 모두 100%의 살충률을 확인하였다. 포스핀을 대상으로한 머리대장가는납작벌레의 태별 LCT50 값은 알은 0.710 mg h/L, 후기유충과 성충은 각각 0.254, 0.477 mg h/L로나타났으며, LCT99 값은 알은 1.593 mg h/L, 후기유충 1.278 mg h/L, 성충 3.042 mg h/L임을 확인하였다.
박정선,정혜미,Park, Jeong-Seon,Jeong, Hye-Mi 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.9
A numerical flow-field analysis is performed to investigate flow configurations in the anode, cathode and cooling channels on the bipolar plates of a proton exchange membrane fuel cell (PEMFC). Continuous open-faced flow channels are formed on the bipolar plate surface to supply hydrogen, air and water. In this analysis, two types of channel pattern are considered: serpentine and spiral. The averaged pressure distribution and velocity profiles of the hydrogen, air and water channels are calculated by two-dimensional flow-field analysis. The equations for the conservation of mass and momentum in the two-dimensional fluid flow analysis are slightly modified to include the characteristics of the PEMFC. The analysis results indicate that the serpentine flow-fields are locally unstable (because two channels are cross at right angles). The spiral flow-fields has more stable than the serpentine, due to rotational fluid-flow inertia forces. From this study, the spiral channel pattern is suggested for a channel pattern of the bipolar plate of the PEMFC to obtain better performance.