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다목적 용수를 고려한 제주도 농업용 지하수 이용량 모델 개발
안중기 ( Jung Gi An ),송성호 ( Sung Ho Song ),이동림 ( Dong Rim Lee ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.4
The estimation of groundwater usage in Jeju island is important to understand hydrologic cycle system and to plan management of water resource because large amounts of groundwater have been used for agricultural and domestic purpose. The model has been developed to estimate agricultural groundwater usage for garlic at uplands and citrus at orchards raising outdoors using the soil water balance model from FAO 56, respectively. The total amount of water supplied for the crop evapotranspiration and the multipurpose function such as sprout promotion can be simulated by the model. However, due to the discrepancy of water use in initial stage between calculated and observed, the model was calibrated and verified using actual groundwater usage monitoring data for 3.5 years (2011.6 to 2014.12) at three uplands for garlic and three orchards for citrus. Consequently, it would be concluded that the model simulated efficiently actual water usage in that root mean square (RMS) and normalized RMS of the validation stage were less than 8.99 mm and 2.43%, respectively, in two different conditions.
한계전류형 YSZ 산소센서의 산소감응 특성에 미치는 고체전해질 결정성 및 확산장벽 두께의 영향
박동원,김대용,이동림 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.3
The limiting current type oxygen sensor is known for excellent characteristics at the low temperatures and throughout the wide oxygen concentration range. In this study, 3 ㏖% Y₂O₃ doped poly-crystal and 15 ㏖% Y₂O₃ doped single-crystal zirconia were used as the solid electrolyte of limiting current type oxygen sensors. The limiting current of the sensor using polycrystalline YSZ was observed over the oxygen concentration range of up to 62.5% and at a temperature range of 560℃∼720℃ in O₂-N₂ mixtures. The sensor using single crystal-YSZ had lower operating voltage than the sensor with polycrystalline YSZ probably due to its low electrolytic resistance.