이상기상에 따른 작물의 생리반응 및 대응전략

위승환,전희,이희주,이진형,이희수,김성겸 한국약용작물학회 2019 한국약용작물학회 학술대회논문집 Vol.2019 No.1

빅데이터를 활용한 재배환경이 전라남도 지방 가을배추의 생육과 수량에 미치는 영향 분석

위승환,이희주,유인호,장윤아,여경환,안세웅,이진형 한국농림기상학회 2020 한국농림기상학회지 Vol.22 No.3

This study was conducted to evaluate the effect of environment factors on the growth of autumn season cultivation of Kimchi cabbage using the big data in terms of public open data(weather, soil information, and growth of crop, etc.). The growth data and the environment data such as temperature, daylength, and rainfall from 2010 to 2019 were collected. As a result of composing the correlation matrix, the height and leaf number showed high correlation in growing degree days(GDDs) and daylength, and the yield showed negative correlation in growing degree days and the concentration of clay. GDDs and daylength explained about 89% and 84% of variation in height, respectively. These two environmental factors also explained about 85% and 79% of variation in leaf numbers, respectively. In contrast, the coefficient of determination was low for yield when GDDs and concentration of clay was used. The outcome of regional statistical analysis indicated that relationship between yield and sum of sand and silt were high in Haenam and Jindo areas. Hierarchical cluster analysis, which was performed to verify the association of yield, GDDs, and concentration of clay, showed that Haenam and Jindo were clustered together. Although GDDs and yield vary by year and region, and there are regions with similar concentration of clays, observation data are grouped as the result. These suggests that GDDs and soil texture are expected to be related to yield. The cluster analysis results can be used for further data analysis and agricultural policy establishment. 본 연구는 배추 주산지인 전남지방의 가을배추 생육 빅데이터를 활용하여 재배환경요소가 가을배추의 생육에 미치는 영향을 구명하기 위해 수행되었다. 전남지방의 2010∼2019년 가을배추 생육데이터를 수집하여 기온, 일조시간, 강우량, 토성 등 재배환경데이터와의 연관성을 분석하였다. 상관행렬을 작성한 결과 초장과 엽수는 생육도일과 일조시간에서 높은 상관계수를 보였고 수량은 생육도일과 점토함량에서 음의 상관관계를 보였다. 상관계수 분석을 통해 선발된 지표들을 선형회귀분석 하였는데 초장과 생육도일, 초장과 합계 일조시간, 엽수와 생육도일, 엽수와 합계일조시간의 결정계수가 각각 0.79, 0.71, 0.7, 0.62이었으나 수량과 생육도일, 수량과 토성의 경우 결정계수가 낮았다. 수량과 생육도일 토성을 통계분석 한 결과 해남과 진도 지역의 수량이 높았고 생육도일과 토양내 점토 함량이 낮은 것으로 나타났다. 수량, 생육도일, 토성에 대한 연관성 검증을 위하여 계층적 군집분석을 수행한 결과, 통계적으로 유사 지역으로 분류된 해남과 진도가 같은 군집을 이루었고 그 외 지역이 다른 군집을 이루었다. 연도 및 지역에 따라 생육도일과 수량이 다르고 토성이 유사한 지역이 있음에도 불구하고 관측데이터가 지역별로 군집이 이루어진 것으로 보아 생육도일과 점토 함량은 수량과 연관성이 있는 것으로 판단된다. 연관성 분석 외에도 지역별 군집을 통하여 데이터 분석 및 영농정책 수립 등에 군집분석 결과를 활용할 수 있을 것으로 기대된다.

정식 초기의 저온·저일조가 토마토 수량·품질에 미치는 영향

위승환,여경환,최학순,유인호,이진형,이희주,Wi, Seung Hwan,Yeo, Kyung-Hwan,Choi, Hak Soon,Yu, Inho,Lee, Jin Hyong,Lee, Hee Ju 한국생물환경조절학회 2021 생물환경조절학회지 Vol.30 No.4

본 연구는 생육초기 저온 저일조 조건이 토마토의 수량 및 품질에 미치는 영향을 구명하기 위해서 수행되었다. 비가림 하우스에서 정식 후 17일에 측창 개폐와 차광막을 이용하여 26일간 저온, 저온차광 처리하였다. 처리기간 동안의 토마토 GDD를 산출한 결과 저온 처리로 인해 GDD가 5.5% 감소하였다. 차광 처리에 의한 평균 일사량을 분석한 결과 대조구 대비 차광처리가 25.3% 수준이었으며, 일 최고광량의 평균을 분석한 결과 대조구, 차광처리가 각각 634, 156W·m^-2였다. 처리 결과 저온차광에 의하여 엽수, 엽면적, 생체중, 건물중, SPAD를 분석한 결과 차광에 처리에 의하여 생육이 저하된 것을 볼 수 있었으며 초장은 웃자란 것을 확인할 수 있었다. 수량을 분석한 결과 첫 수확일은 정식 후 63일로 동일 하였으나 무처리구, 저온처리, 저온 강차광 순으로 각각 177, 99, 53g/plant로 최대 3.3배까지 차이를 보였으며, 최종 수확일인 정식 후 87일의 누적수량은 각각 1734, 1131, 854g/plant로 생육 초기 저온, 저온차광 처리에 의하여 수량이 각각 34.8, 50.7% 감소한 것을 확인할 수 있었다. 처리와 수확기에 따른 토마토의 품질을 조사한 결과 당도와 산도는 처리 및 수확기에 따른 차이가 없었다. 처리에 따른 광합성 특성을 조사하기 위하여 이산화탄소반응 곡선을 작성하고 광합성 기구의 생화학적 모델을 활용하여 분석한 결과 최대 광합성 속도와 J, TPU, R_d는 온도에 따른 차이를 보이지 않았으나 차광에 의하여 감소된 것을 확인할 수 있으며, V_cmax의 경우 저온 과 차광에 따라서 값이 감소되는 것을 확인할 수 있었다. 이로 보아 정식 후 생육초기 저온 저일조는 토마토의 초기생육과 광합성능력을 감소시키며, 생육이 진행되면서 생육에 대한 차이가 없어지거나 줄어들고 품질 변화도 나타나지 않았지만 누적 수량이 감소하기에 이를 방지하기 위해서는 생육초기 저온 및 저온저일조 등 이상기상 발생시 보온 및 보광이 필요하다. This study was conducted to the effect of low air temperature and light intensity conditions on yield and quality of tomato at the early stage of growth in Korea. Inplastic greenhouses, low temperature and low temperature with shade treatments were performed from 17 to 42 days after plant. Tomato growing degree days were decreased 5.5% due to cold treatment during the treatment period. Light intensity decreased 74.7% of growing degree days due to shade. After commencing treatments, the plant growth decreased by low temperature and low radiation except for height. Analysis of the yield showed that the first harvest date was the same, but the yield of the control was 3.3 times higher than low temperature with shade treatment. The cumulative yields at 87 days after transplanting were 1734, 1131, and 854 g per plant for control, low temperature, and low temperature with shade, respectively. The sugar and acidity of tomatoes did not differ between treatment and harvesting season. To investigate the photosynthetic characteristics according to the treatment, the carbon dioxide reaction curve was analyzed using the biochemical model of the photosynthetic rate. The results showed that the maximum photosynthetic rate, J (electric transportation rate), TPU (triose phosphate utilization), and R_d (dark respiration rate) did not show any difference with temperature, but were reduced by shading. Vcmax (maximum carboxylation rate) was decreased depending on the low temperature and the shade. Results indicated that low temperature and light intensity at the early growth stage can be inhibited the growth in the early stage but this phenomenon might be recovered afterward. The yield was reduced by low temperature and low intensity and there was no difference in quality.

생육도일(GDDs)에 따른 ‘춘광’ 봄배추의 적정 재배 작기 예측

위승환,송은영,오순자,손인창,이상규,이희주,문보흠,조영열 한국농림기상학회 2018 한국농림기상학회지 Vol.20 No.2

Knowledge of the optimum cultivation period for Chinese cabbage would help growers especially in spring in Korea. Growth and yield of Chinese cabbage in a temperature gradient chamber was evaluated for the growing periods of 64 days from three set of transplanting dates including March 6, March 20, and April 3 in 2017. Air temperature in the chamber was elevated step-by-step, by 2℃ above the ambient temperature. This increment was divided into three phases; i.e. low (ambient+2℃, A), medium (ambient+4℃, B), and high temperature (ambient+6℃, C). The fresh weight of Chinese cabbage was greater under B and C conditions in the first period and A in the second period, which indicated that GDDs affected the fresh weight considerably. However, leaf growth (number, area, length, and width) did not differ by GDDs. Bolting appeared under A condition in the first period, which was caused by low temperature in the early growth stage. Soft rot was developed under C condition in the second period and all temperature conditions in the third period, which resulted from high temperature in the late stage. Fresh weight increased when GDDs ranged from 587 to 729. However, it decreased when GDDs > 729. The maximum expected yield (16.3 MT/10a) was attained for the growing period of 64 days from transplanting date during which GDDs reached 601. The GDDs for optimum cultivation ranged from 478-724 under which the yield was about 95% (15.5 MT/10a) of maximum fresh weight. Such an optimum condition for GDDs was validated at five main cultivation regions including Jindo, Haenam, Naju, Seosan, and Pyeongtaek in Korea. In these regions, GDDs ranged from 619-719. This suggested that the optimum GDDs for Chinese cabbage cultivation would range from 478-724, which would give the useful information to expect the cultivation periods for ensuring maximum yield. 본 연구는 기온에 따른 봄배추 ‘춘광’의 재배 적기를 밝혀 농가에 적정 재배시기를 제공하기 위해서 수행되었다. 기온이 외기보다 6℃까지 단계적으로 상승하도록 설계된 온도구배 터널을 3개의 구역(외기+2℃, A; 외기+4℃, B; 외기+6℃, C)으로 나눈 후 작기(2017.3.6., 1차; 3.20., 2차; 4.3., 3차)에 걸쳐 정식하였다. 재배기간 동안의 생육도일(growing degree days, GDDs)은 1차 A, 1차 B, 2차 A, 1차 C, 2차 B, 3차 A, 2차 C, 3차 B, 3차 C 순으로 높았다. 구중은 1차 B, 1차 C, 2차 A 처리구에서 높게 나타나 처리간 높은 유의적 차이를 보였으나 생태적인 특성(엽수, 엽면적, 최대엽의 엽장 및 엽폭 등)은 차이가 없었다. 다만, 생육초기 13℃ 이하의 저온에 감응하였던 결과로 1차 A 처리구에서 5.5%의 추대현상이 발생하였다. 또한 2차 C, 3차 A, B, 및 C 처리구에서 기온이 높아짐에 따라 각각 11.0, 5.5, 33.3, 및 44.4%의 속썩음 현상이 발생하였다. GDDs에 따른 배추 구중은 587 GDDs까지 증가하다 729 GDDs 이후에는 오히려 감소하였다. GDDs에 따른 배추 수량과 적정 재배시기 예측식에서 최대 기대수량은 정식 후 64일 기준 GDDs가 601일 때 16.3MT/10a이었다. 최대 수량의 95%(약 15.5MT/10a) 이상을 재배 적기로 설정할 때 적정 범위는 478∼724 GDDs로 산출되었다. 재배적기 예측식의 검증 결과, 봄배추 주산지인 진도, 해남, 나주, 서산, 평택의 GDDs는 각각 634, 619, 666, 652, 및 719이었고, 예측식에서 산출된 범위(478∼724 GDDs)에 포함되었다. 결과적으로 봄배추의 재배 최적기는 예측식의 최대값인 수확기준 601 GDDs이며 적정 범위는 호냉성인 온도 특성을 감안하여 478∼724 GDDs 인 것으로 판단된다.

생육 초기의 저온·저일조가 고추의 수량과 품질에 미치는 영향

위승환,이희주,유인호,장윤아,여경환,안세웅,이진형,김성겸 한국환경과학회 2020 한국환경과학회지 Vol.29 No.10

This study was conducted to determine the effect of low temperature and low radiation conditions on the yield and quality of hot pepper at an early growth stage in Korea. In plastic greenhouses, low temperature, low temperature with covered shading treatments were set 17 to 42 days after transplanting. The pepper growing degree days decreased by 5.5% due to the low temperature during the treatment period. Radiation decreased by 74.7% due to the covered shading. After commencing treatments, pepper plant growth decreased with low temperature and low radiation. Analysis of the yield showed that the first harvest was delayed by low radiation. The cumulative yields of 119 days after transplanting were 1,956, 2,171, and 2,018 g/m2 for control, low temperature, and low temperature with low radiation respectively. Capsaicin and dihydrocapsaicin concentrations in pepper fruit decreased with low temperature and low radiation. To investigate the photosynthetic characteristics according to the treatment, the carbon dioxide reaction curve was analyzed using the biochemical model of photosynthesis. Results showed that the maximum photosynthetic rate, Vcmax (maximum carboxylation rate), J (electric transportation rate), and TPU (triose phosphate utilization) decreased at low temperatures; the maximum photosynthetic rate, J, and gm (dark respiration rate) were reduced by shading. These results indicate that low temperature and low radiation can retard early growth, yield, and quality, but these can also be recovered 119 days after planting. Based on the results, the yield and quality of pepper can recover from abiotic stresses with proper cultivation.

Performance evaluation of macro-packed fatty acid ester composites using energy-efficient thermal storage systems

위승환,정수광,장성진,이종기,김수민 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.55 No.-

The fatty-acid composites are used for thermal-storage systems. The macro-packing method was developed to prevent leakage during the phase transition and to enhance the thermal conductivity. The thermal conductivity of the macro-packed fatty-acid composites were increased by 5.19–27.64% when compared with the non-packed fatty-acid composites. The thermal-storage performances were analyzed using differential scanning calorimetry (DSC). The latent-heat levels of the fatty acid waxes during the endothermic process are from 106.9 to 173.6 J/g. A thermal-performance device was used for a dynamic heat-transfer analysis. The macro-packed fatty-acid composites significantly reduced the peak load.

제주지역에서의 노지재배에 적합한 아티초크 품종 선발

위승환(Seung Hwan Wi),성기철(Ki Cheol Seong),김천환(Chun Hwan Kim),손다니엘(Daniel Son),임찬규(Chan Kyu Lim) 한국원예학회 2014 한국원예학회 학술발표요지 Vol.2014 No.10

축열골재 혼합비율에 따른 축열석고보드의 열적 성능 분석

위승환(Seunghwan Wi),이준희(Junhee Lee),장성진(Seong Jin Chang),이종기(Jongki Lee),이화영(Hwayoung Lee),김수민(Sumin Kim) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6

The latent heat storage technique in energy storage technologies is widely used to efficiently utilize heat energy in different fields, since it can store much more heat than sensory sensitivity. Phase Change Material (PCM), one of the materials used in latent heat storage techniques, is one of the most efficient ways to store heat energy utilizing thermal heat accumulators. As a result of varying degrees of heat flux, the PCM uses heat to store heat in the form of latent heat changes in the form of latent heat. In this paper, the thermal analysis of the paraffin series was inserted into the porous material, which produced a thermal board that improved thermal performance and improved thermal analysis. As a result of the analysis, the thermal conductivity of the PCM was effectively improved as the mixing ratio of heat storage materials increased. This could be applied to building energy savings and enhancing the comfort of the occupants when the constructed heat board is subsequently applied to functional building materials.

FT-IR 스펙트럼 데이터를 이용한 저온 처리에 따른 봄배추 유묘의 대사체 다변량 통계 분석

위승환(Seunghwan Wi),문경환(Kyung Hwan Moon),송은영(Eun Young Song),오순자(SoonJa Oh),송승엽(Seung Yeob Song) 한국원예학회 2018 한국원예학회 학술발표요지 Vol.2018 No.5

건축 단열재의 종류 및 특성에 따른 환경성능 평가

위승환(Wi, Seung hwan),김영욱(Kim, Young Uk),김수민(Kim,Su min) 한국생태환경건축학회 2020 한국생태환경건축학회 학술발표대회 논문집 Vol.20 No.2