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수경재배 시 적산 일사량과 배지 수분 함량 복합 급액 제어에 의한 '설향' 딸기(Fragaria annanassa Dutch. cvs. 'Sulhyang')의 생육 및 품질
최수현,김소희,최경이,정호정,임미영,김대영,이선이,Choi, Su Hyun,Kim, So Hui,Lee Choi, Gyeong,Jeong, Ho Jeong,Lim, Mi Young,Kim, Dae Young,Lee, Seon Yi 한국생물환경조절학회 2021 생물환경조절학회지 Vol.30 No.4
우리나라 딸기 재배는 시설 재배로 이루어지고 있으며, 대부분 농가의 급액 관리는 재배자의 경험을 토대로 타이머 제어 방식으로 이루어지고 있다. 타이머 급액 방법은 재배 환경, 작물의 생육 단계, 배지 수분 함량 등을 고려하기 어려워 작물을 최적 수준으로 관리하지 못하고, 급액 관리의 정확성이 결여되는 문제점이 있다. 적산 일사량과 배지 수분함량을 이용한 급액 방법은 작물의 생육 상태에 따라 정밀하게 양액을 공급하는 친환경적인 방법이다. 본 연구는 코이어배지를 이용한 딸기 수경재배에서 적산일사량과 배지 수분함량을 이용한 복합 급액 제어와 타이머 제어 급액 방법을 비교하고 복합 급액 제어 시 최적의 적산 일사량 기준을 설정하고자 수행하였다. 적산일사량 급액 방법은 외부 일사량을 기준으로 100, 150, 250J·cm<sup>-2</sup>에 도달하면 자동으로 급액하며 배지 수분함량이 60% 미만이면 강제 급액하고, 1회 급액량은 50mL로 공급하였다. 타이머 제어는 대조구로 설정하였다. 급액을 개시하는 적산 일사량 기준이 작을수록 일일급액량이 많았으며 100J·cm<sup>-2</sup> 기준 급액 시 급액량은 250J·cm<sup>-2</sup> 처리구 대비 46% 많았다. 지상부 생체중과 건물중 모두 복합 급액 제어 방법이 타이머 제어보다 높았으며, 100, 150J·cm<sup>-2</sup> 처리구에서 지상부 생체중이 높았고 100J·cm<sup>-2</sup> 처리구에서 건물중이 유의하게 높은 값을 나타냈다. 수량 또한 타이머 제어 방법보다 복합 제어 방법에서 유의하게 높았으며 적산 일사량 기준이 작을수록 초기 수량이 증가하였다. 평균 과중은 타이머 제어 급액 시 가장 낮았다. 본 연구 결과 딸기의 정밀 급액 관리를 위하여 적산 일사량과 배지 수분 함량 센서를 이용한 복합 제어 활용 가능성을 확인하였다. Strawberry cultivation in Korea is grown in greenhouse, but most farms manage their water supply using a timer control method based on the experience of growers. The timer control has problems in that it is difficult to consider the weather condition, the growth stage of crops, and the moisture content of the substrate, so that the crops cannot be managed at an optimal level, and the accuracy of cultivation management are lacking. The watering methods using integrated solar irradiance and substrate moisture contents are control systems that provide eco-friendly and precise water supply considering the growth conditions of crops. The purpose of this study was to compare the combined water supply control with integrated solar irradiance and substrate moisture contents and timer control method in hydroponic cultivation of strawberries using coir, and to set the optimal integrated solar irradiance level for complex water supply control. The irrigation system was automatically watered when it reached 100, 150, 250 J·cm<sup>-2</sup> based on the external solar irradiance, and forced irrigation was performed at a substrate moisture content of less than 60% in all treatments. The amount of irrigation at once was 50 mL. The timer treatment was applied as a control. The smaller the level of integrated radiation to start watering, the greater the daily amount of irrigation. Both the fresh weight and dry weight per plant were higher in the complex irrigation control method than the timer control, and the 100 and 150 J·cm<sup>-2</sup> treatment had the highest fresh weight, and the 100 J·cm<sup>-2</sup> treatment showed a significantly higher dry weight. The yield was also significantly higher in the complex control method than in the timer, and the early yield increased as the level of integrated solar irradiance was smaller. The fresh weight of fruit was the lowest in the timer-controlled irrigation. As a result of this study, the possibility of combined control irrigation method using integrated solar irradiance and substrate moisture content was confirmed for precise water supply management of strawberries in hydroponics.
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대학교 행정실 실내 외 공기 중 나노입자와 중금속 농도에 관한 연구
최수현,임지영,박희진,정은경,김종오,손부순,Choi, Su-Hyeon,Im, Ji-Young,Park, Hee-Jin,Chung, Eun-Kyung,Kim, Jong-Oh,Son, Bu-Soon 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.6
Objectives: The purpose of this study is to investigate the mass concentration of nanoparticles and understand the characteristics of elements of heavy metal concentrations within nanoparticles in the air using Micro-Orifice Uniform Deposit Impactor Model-110 (MOUDI-110), based on indoor and outdoor air. Methods: This Study sampled nanoparticles using MOUDI-110 indoors (office) and outdoors at S University in Asan, Korea in order to reveal the concentration of nanoparticles in the air. Sampling continued for nine months (10 times indoors and 14 times outdoors) from March to November 2010. Mass concentrations of nanoparticle and concentrations of heavy metals (Al, Mn, Zn, Ni, Cu, Cr, Pb) were analyzed. Results: Indoors, geometric mean concentration of nanoparticles ranged in size from 0.056 ${\mu}m$ to 0.10 ${\mu}m$ and those of 0.056 ${\mu}m$ or less recorded 0.929 ${\mu}g/m^3$ and 1.002 ${\mu}g/m^3$, respectively. On the other hand, the levels were lower outdoors with 0.819 ${\mu}g/m^3$ and 0.597 ${\mu}g/m^3$. Mann-Whitney U tests showed that the difference between the indoors and the outdoors was statistically meaningful in terms of particles of 0.056 ${\mu}m$ or less (p<0.05) in size. These results are possibly influenced by the use of printers and duplicators as the factor that increased the concentration of nanoparticles. In seasonal concentration distribution, the level was higher during the summer compared to in the autumn. Those of 0.056 ${\mu}m$ or less in size presented a statistically meaningful difference during the summer (p<0.05). These results may be influenced by photochemical event as the factor that makes the levels high. Regarding zinc, among the other heavy metals, the fine particles ranged in size from 0.056 ${\mu}m$ to 0.10 ${\mu}m$ and those of 0.056 ${\mu}m$ or less recorded 1.699 $ng/m^3$ and 1.189 $ng/m^3$ in the outdoors. In the indoors, the levels were lower, with 0.745 $ng/m^3$ and 0.617 $ng/m^3$. Cr and Ni at the size of 0.056 ${\mu}m$ or less, both of which have been known to pose severe health effects, recorded higher concentrations indoors with 0.736 $ng/m^3$ and 0.177 $ng/m^3$, compared to 0.444 $ng/m^3$ and 0.091 $ng/m^3$ outdoors. By season, Zn, Ni, Cu and Pb posted a high level of indoor concentration during the fall. As for Cr, the level of concentration indoors was higher than outdoors both during the summer and the autumn. Conclusion: This study indicates the result of an examination of nano-sized particles and heavy metal concentrations. It will provide useful data for the determination of basic nanoparticle standards in the future.
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딸기 수경재배 시 ‘베리스타’와 ‘죽향’의 생육과 품질 향상을 위한 적정 양액농도 설정
최수현(Su Hyun Choi),최경이(Gyeong Lee Choi),정호정(Ho Jeong Jeong),김승유(Seung Yu Kim),이성찬(Seong Chan Lee),최효길(Hyo Gil Choi) (사)한국생물환경조절학회 2017 생물환경조절학회지 Vol.26 No.4
최근 국내에서 육성된 딸기 신품종 ‘베리스타’와 ‘죽향’ 의 수경재배 시 생육 단계별 적정한 양액 농도가 품질과 생산성에 미치는 영향을 구명하기 위하여 연구를 수행하였다. 길이 40m, 폭 10m의 플라스틱 온실 내에 높이 1m, 폭 33cm의 수경재배용 베드를 설치하고 원예용상토를 충진한 후 ‘설향’, ‘베리스타’, ‘죽향’ 묘를 정식하였다. 배양액은 네덜란드 PBG 배양액을 사용하였으며, 생육 단계를 생육초기-개화기-수확초기-수확후기로 나누어 처리 2는 ‘설향’ 기준 급액 농도 EC 0.68-1.0-1.2-1.0dS·m<SUP>-1</SUP>, 처리 1은 30% 낮은 농도인 EC 0.68-0.8-0.85-0.7dS·m<SUP>-1</SUP>, 처리 3은 30% 높은 농도인 EC 0.68-1.2-1.55-1.3dS·m<SUP>-1</SUP>으로 급액 하였다. 재배기간 동안 딸기품종별 생육과 수량 등을 조사하였다. ‘베리스타’는 2번 처리구와 3번 처리구 간의 지상부 생육에 차이가 없었으며, ‘베리스타’와 ‘죽향’ 모두 양액 농도가 높을수록 엽색이 짙었으나 양자 효율은 차이가 나지 않았다. ‘죽향’은 급액농도에 따라 3월 이후 생육 후기에 생육 차이가 뚜렷하였고, 3번 처리구에서 가장 생육이 왕성하였다. ‘베리스타’와 ‘죽향’ 모두 과중, 과장, 과폭 및 과실 경도가 3번 처리구에서 유의하게 높은 값을 나타냈다. 수확과의 총 당 함량은 처리 간에 차이가 없었으나 환원당과 비환원당의 조성 비율은 처리별로 다르게 나타났다. 수량을 조사한 결과, ‘베리스타’는 급액 농도가 높아질수록 수확과의 수가 많았으나 수량은 처리별로 큰 차이가 나타나지 않았다. 반면, ‘죽향’은 급액농도 간에 뚜렷한 차이를 보였으며, 3번 처리구에서 가장 수확량이 많았다. 생육 특성과 과실 품질을 종합적으로 고려해 본 결과, ‘베리스타’는 ‘설향’ 표준 급액농도와 동일하게 EC 0.68-1.0-1.2-1.0dS·m<SUP>-1</SUP>로 관리하는 것이 경제적이며, ‘죽향’은 ‘설향’ 기준 급액농도보다 30% 높은 EC 0.68-1.2-1.55-1.3dS·m<SUP>-1</SUP>로 공급해 주는 것이 고품질의 과실을 많이 수확할 수 있는 방법으로 판단된다. This study was conducted to set the optimum nutrient solution concentration by growth stage for new strawberry cultivars ‘Berrystar’ and ‘Jukhyang’(Fragaria × ananassa Duch. cvs. ‘Berrystar’, ‘Jukhyang’) grown through hydroponics to improve the quality and yield. Three different EC levels were applied to the nutrient solution. The treatment levels were 0.7, 1.0 and 1.3 times higher than the nutrient concentration standard for ‘Seolhyang’ based on the ‘Manual for strawberry cultivation’ of Rural Development Administration. Based on the results, there were no significant differences in growth of ‘Berrystar’ by EC level. ‘Jukhyang’ showed the most vigorous growth grown in 1.3 times higher nutrient concentration. While the growth of ‘Berrystar’ and ‘Jukhyang’ grown in higher EC level has leaves with more chlorophyll concentration. However the quantum yield of leaves was not affected by the treatments. On the treatment with 1.3 times higher EC level, the weight, length, width and firmness of ‘Berrystar’ and ’Jukhyang’ were significantly high. The sugar contents of the harvest analyzed by HPLC did not differed particularly, but the percentage composition of reducing sugar and non-reducing sugar were presented differently depending on the treatments. Marketable fruit yield increased as nutrient concentration increases. However, there were no large differences by treatments. Meanwhile, ‘Jukhyang’ showed significant difference by nutrient concentration and had the largest yield for a treatment grown in 1.3 times higher EC level. Based on these results, it is recommended to provide the same nutrient solution concentration level to the nutrient concentration standard of ‘Seolhyang’ for ‘Berrystar’, and the 1.3 times higher level for ‘Jukhyang’.
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민감도를 이용하여 풍력단지가 연계된 송전계통의 최적혼잡처리
최수현(Soo-Hyun Choi),김규호(Kyu-Ho Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.12
This paper studies generator rescheduling technique for congestion management in power system with wind farms. The proposed technique is formulated to minimize the rescheduling cost of conventional and wind generators to alleviate congestion subject to operational line overloading. The generator rescheduling method has been used with incorporation of wind farms in the power system. The locations of wind farms are selected based upon power transfer distribution factor (PTDF). Because all generators in the system do not need to participate in congestion management, the rescheduling has been done by generator selection based on the proposed generator sensitivity factor (GSF). The selected generators have been rescheduled using linear programming(LP) optimization techniques to alleviate transmission congestion. The effectiveness of the proposed methodology has been analyzed on IEEE 14-bus systems.
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