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N, K, Ca의 한정된 이온센서 이용을 전제로 한 순환식 수경재배에서 P, Mg의 조절 방법
최경이(Gyeong Lee Choi),여경환(Kyung Hwan Yeo),이한철(Han Cheol Rhee),이성찬(Seong Chan Lee),이중섭(Jung-Sup Lee),강남준(Nam Jun Kang),김학진(Hak Jin Kim),정대현(Dae Hyun Jung) 한국원예학회 2016 원예과학기술지 Vol.34 No.6
Recycling nutrient solutions in closed hydroponic production systems is usually accompanied by an imbalance of nutrient solutions when concentration is controlled according to electrical conductivity (EC) levels. This study investigated whether it was possible to automatically control the concentrations of five essential elements nitrogen (N), phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg) using only N, K and Ca ion sensors. N, P, K, Ca, and Mg uptake was measured in the nutrient solution, and relationships between absorbed ions were analyzed through twice-repeated experiments in lettuce. Results confirmed that the pattern of PO₄ ion uptake was similar that of N, and the pattern of Mg ion uptake was similar that of Ca. PO₄ ion uptake was most highly correlated with N, and Mg was most highly correlated with Ca. Regression coefficients of N and PO₄ were significantly different at 1.04 and 0.55, respectively, but were similar between Ca and Mg at 0.35 and 0.40, respectively. Additional experiments were conducted to measure nutrient uptake in pak choi and rose plants, both to confirm the results from the first experiment in lettuce, and to assess possible application to other crops. Coefficients of determination both for N and PO₄, and Ca and Mg were considerably high (R² = 0.86) in cultured pak choi, and similar results were observed in cultured rose (R² = 0.87 and 0.73, respectively). Regression coefficients for cultured pak choi were 0.56 and 0.24, respectively, and for rose were 0.51 and 0.16, respectively. Although the results obtained for N and PO₄ were not consistent between the lettuce experiments, N and PO₄ have similar regression coefficients for all crops. No common coefficient was found between Ca and Mg.
PV Module 부분음영이 출력에 미치는 영향에 대한 연구
최경한(Kyung-Han Choi),최홍규(Hong-Kyoo Choi),박준열(Joon-Yeal Park),송영주(Young-Joo Song),최영준(Young-Joon Choi),하춘섭(Chun-Sup Ha) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.9월
In this paper, 1.14㎾ (190W, 6 Module) of the PV Module Solar Facility in the shade look like, the output, voltage, current, and module temperature changes were studied. In addition, A 6th of the shading effect of Module select the largest output compared to the partial shading, voltage, current, and temperature variation were investigated.
코이어 배지 이용 토마토 장기 수경재배시 급액 EC가 근권부 무기이온과 생육에 미치는 영향
최경이(Gyeong Lee Choi),여경환(Kyung Hwan Yeo),최수현(Su Hyun Choi),정호정(Ho Jeong Jeong),강남준(Nam Jun Kang),최효길(Hyo Gil Choi) (사)한국생물환경조절학회 2017 생물환경조절학회지 Vol.26 No.4
수경재배에서는 제한된 근권에서 작물의 양수분 흡수특성을 고려하여 양액을 공급하여 재배하고 있지만 작물의 무기이온 흡수는 기상조건이나 작물의 생장에 의해 이온간 흡수비율이 달라지므로 근권내 이온의 균형이 깨지기 쉽다. 그런데 최근에는 토마토 재배에는 무기배지인 암면을 대체하여 코이어 배지가 주로 이용되고 있는데 코이어 배지를 이용한 장기재배에서 양액의 공급이 근권과 생육에 미치는 영향에 관한 연구는 거의 없다. 따라서 본 시험에서는 코이어를 이용한 토마토 장기 수경재배에 급액의 EC농도가 근권의 무기이온과 생육에 미치는 영향을 구명하고자 하였다. 칩과 더스트가 5:5로 혼합된 코이어 배지를 이용하였으며, 급액의 EC를 1.0, 1.5, 2.0, 3.0 dS·m<SUP>-1</SUP> 로 달리 공급하였다. 급액 EC가 낮은 1.0dS·m<SUP>-1</SUP>, 1.5dS·m<SUP>-1</SUP> 처리구에서는 NO₃-N, P, Ca, Mg 이온이 초기에 급액농도 보다 배액의 농도가 낮았다. 그러나 P를 제외한 모든 이온이 EC 2.0dS·m<SUP>-1</SUP> 농도 보다 농도로 급액한 것은 배지내 농도가 매우 높아졌다. 배액에 특히 높아지는 이온은 S와 Mg였다. 평균 과중은 3화방까지는 EC 1.0dS·m<SUP>-1</SUP>, 1.5dS·m<SUP>-1</SUP>간에 큰 차이가 없었으나 이후로는 급액의 EC가 높을수록 과중이 작았다. 6화방까지 수확 과수와 수량이 1.5dS·m<SUP>-1</SUP>가 가장 많았으나 재배기간이 경과할수록 고농도 급액구의 수량이 감소하였다. 배꼽썩음과는 생육초기에는 주로 EC 3.0dS·m<SUP>-1</SUP> 처리에서만 발생하였으나 일사량이 증가하면서 모든 처리에서 발생하였다. 발생율은 EC 3.0dS·m<SUP>-1</SUP> 처리구가 높고, 더 낮은 농도 처리에서는 발생율의 차이가 없었다. In hydroponics, the nutrient solution is supplied considering the water and nutrient uptake characteristics of crops. However, as the ionic uptake characteristics are changed as a result of the weather conditions or the growth response of the crops, the root zone can not be maintained in optimal condition. In addition, the coir substrate has been used mainly for the tomato cultivation in place of the inorganic substrate, there are few studies on long-term cultivation using coir substrate. Therefore, this study was conducted to investigate the effect of EC level of irrigation solution on tomato growth and inorganic ions of root zone in soilless culture using coir. Coir substrate mixed with 5 : 5 chip and dust was used. EC level of irrigation solution was 1.0, 1.5, 2.0, and 3.0 dS·m<SUP>-1</SUP>. At the initial stage, NO₃- N, P, Ca and Mg in the drainage were lower than the irrigation level at 1.0 and 1.5 dS·m<SUP>-1</SUP>. However, EC 2.0 dS·m<SUP>-1</SUP> or higher, all the ions except P were highly concentrated in the drainage. The average fruit weight was not significantly different between 1.0 and 1.5 dS·m<SUP>-1</SUP> until 3th cluster, but from the next cluster, the higher the EC level, the smaller the weight. The number of fruit and yield to 6th cluster was the highest at 1.5dS·m<SUP>-1</SUP>. From the next cluster, The yield was decreased with the higher EC level. At the early stage of growth, BER occurred only in EC 3.0 dS·m<SUP>-1</SUP>, but increased in all treatments with increasing irradiation. The incidence rate of EC 3.0 dS·m<SUP>-1</SUP> was higher than that of the lower EC level treatment.
최준영(June-Young Choi),최홍규(Hong-Kyoo Choi),이근무(Guen-Moo Lee),최경한(Kyung-Han Choi),임명환(Myung-Hwan Lim),최신권(Shin-Gwon Choi),이정렬(Jung-Youl Lee),황상구(Sang-Gu Hwang) 한국조명·전기설비학회 2009 한국조명·전기설비학회 학술대회논문집 Vol.2009 No.5월
최근 교토의정서 협약 체결 후 전 세계적으로 각종 환경 관련 규제가 강화되고 있으며, 고유가에 따른 지속 가능한 에너지원의 필요성 확대에 따른 재생에너지분야의 연구가 집중적으로 이루어지고 있다. 이에 본 논문에서는 재생에너지 분야 중 풍력발전시스템에 적용하고자 우리나라의 지형 및 풍속을 조사 · 분석하여 풍력에너지를 검토해보고자 한다. each kind environment connection regulation is solidified worldwide after kyoto protocol recently, and research of revival energy field by necessity extension of source of energy that continuance is possible that follow to high oil price is consisting concentrically. In treatise that see hereupon to apply to wind force development system of revival energy field topography of our country and wind speed investigation · analyze and examine wind force energy wish to.
최홍규(Hong-Kyoo Choi),최신권(Shin-Gwon Choi),최경한(Kyung-Han Choi),최영준(Young-Jun Choi),최대원(Dae-Won Choi),이정은(Jung-Eun Lee),황상구(Sang-Gu Hwang) 한국조명·전기설비학회 2009 한국조명·전기설비학회 학술대회논문집 Vol.2009 No.5월
본 논문에서는 우리나라에서 동일한 환경에 설치되어 있는 247.5㎾ bulk형 모듈과 a-Si형 모듈의 6월 발전량을 조사 · 분석하여 기상조건(일조량, 평균기온, 강수량, 운량, 풍속 등)과의 관계를 분석하고 최근 지구온난화 등으로 인한 기후변화에 따라 보다 고효율적인 모듈 산정방안을 제시하였다. In this treatise, presented module choice plan that analyze relation with meteorological condition (work trillion amounts, mean air temperature, precipitation, cloudiness, wind speed etc.) because diagnoses June output amount of 247.5㎾ bulk type module and a-Si type module that is established in equal environment in our country and is the high effectiveness enemy more by climate fluctuation by latest global warming back.
최경임(Gyeong lim Choi),홍유미(Yumi Hong),이근우(Keun Woo Lee),최영준(Yeung Joon Choi) 한국식품영양과학회 2006 한국식품영양과학회지 Vol.35 No.10
Functionalities of drum-dried fish muscle protein from pH shifting process have been investigated by determining solubility, emulsion activity, rehydration, fat-adsorption capacity, viscosity, and color. Solubility was higher in recovered protein at pH 7.0 than that at pH 5.5, and not dependent on ionic strength. Solubility of the dried protein recovered at pH 7.0 depended on pH of solvent, and lowest in the range of pH 3 to pH 6. The dried protein showed relatively low emulsion capacity in all the samples. Emulsion stability, foam capacity and foam stability were not observed in the samples. Viscosity was in the range of 50,200~39,000 cP. Rehydration and fat-binding capacities were 2.63~2.89 g-water/g and 2.13~2.17 g-oil/g, respectively, and not dependent on particle size and pH. Drum-dried fish muscle protein has a potential application as an ingredient of meat patty products.