• Korean Journal of Agricultural Science
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• v.45 no.4
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• pp.623-634
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• 2018

This experiment was conducted to determine the effects of the pre- and post-harvest variable factors on the processed product of kimchi cabbage. Two kimchi cabbage cultivars, namely 'Chungwang' and 'Dongpung,' were grown in a field and under a plastic greenhouse condition and stored at $5^{\circ}C$ after harvesting with and without low-density polyethylene (LDPE) film packaging. Growths were determined after harvesting while salting characteristics were determined after the processing and storage. The results show that the height, weight and leaf thickness were higher in kimchi cabbages grown in the greenhouse than those grown in the field. The plastic house culture increased the kimchi cabbage growth of the head weight, head height and leaf thickness compared with that of the open field culture. However, the osmolality and firmness were higher in the outdoor cultivated kimchi cabbages. Kimchi cabbage packed in film covered sacks and stored at $5^{\circ}C$ showed lower weight loss than unpacked cabbages during storage. Salt concentration and pH were also affected by the different pre- and post-harvest factors after salting the kimchi cabbages. Salt concentrations of the kimchi cabbage were influenced by various factors such as the cultivars, cultivation methods and storage covering. Though the present findings showed a limited difference in salt concentration and pH between the cultivars of kimchi cabbages, this study suggests that there is a relationship between processed agricultural products and their pre- and post-harvest methods.

• Journal of Plant Biotechnology
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• v.36 no.4
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• pp.403-406
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• 2009

This study was conducted to develop an effective production of callus induction and plant regeneration system for garlic transformation. The best callus production occurred on in vitro root segment initially cultured on MS medium with 1.0 mg/L 2,4-D and 0.2 mg/L IAA in both ‘Danyang' and ‘Euseong'. The frequency of callus formation were 81.2% ‘Danyang' and 76.1% ‘Euseong'. Eight weeks after callus induction, callus lines were transferred to regeneration medium during 7 weeks. The best shoot regeneration medium was MS supplemented with 5 mg/L Kinetin and 1 mg/L NAA for ‘Danyang' and MS supplemented with 10 mg/L BAP for ‘Euseong'. The frequency of shoot regeneration were 51.5% ‘Danyang' and 56.6% ‘Euseong' The plantlets were acclimatized and transferred to the greenhouse with almost survival. This in vitro regeneration system should be useful for garlic transformation.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2020.08a
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• pp.63-63
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• 2020

This study investigated the growth of native ferns under indoor light intensities to identify the introduction possibility as in-door ornamental plants. Three evergreen perennial fern species used in this experiment were Coniogramme japonica (Thunb.) Diels, Woodwardia japonica (L. f.) Sm., and Cyclosorus acuminatus (Houtt.) Nakai ex H. Itô. The light intensities were adjusted to 10, 50, 100 and 200 PPFD (µmol·m^-2·s^-1) based on the measurement of the various indoor light quantities. The experiment was conducted for a total of 8 weeks, and the light period (12/12h), temperature (25±1℃), and humidity (55±3%) were maintained during the experiment. The control plant group was grown in glass greenhouse for the same period. As the result of the study, in door C. japonica showed better growth under light intensities of 100, 200 PPFD. However, withering of the plants were observed under all light intensities except the control, which causes an ornamental value decrease. This seems to be related to the increase of DIo/RC value in chlorophyll fluorescence parameters. In the W. japonica growth data, the plant height was not significantly different from the control but, the leaf number decreased more than a two-fold. Also, the formed leaves turned brown and showed a poor growth and SPAD value at 200 PPFD had decreased significantly. Growth data of C. acuminatus was not significantly different with the control at all light intensities however, withering was observed at 100 and 200 PPFD. In chlorophyll fluorescence parameters, significant decrease in Pi_Abs and increase in DIo/RC value at 200 PPFD impose that stress caused by the intense light might be the reason of the withering of the plants.

• Research in Plant Disease
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• v.13 no.1
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• pp.15-19
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• 2007

A wilt disease on the greenhouse-grown chrysanthemum occurred at Kumi, Masan and Busan, Korea in $2003{\sim}2005$. Symptoms of wilting, yellowing, and marginal burning started from lower leaves and progressed upward. Early symptoms often appeared on one side, involving only one part of the plant or one side of individual leaves or stems without a vascular discoloration. Vascular tissues of the infected leaf-base's discolored to brown. Fungal isolates obtained from discolored tissues were identified as Verticillium dahliae based on its cultural and morphological characteristics. The fungus showed whitish to creamy colony pattern with abundant dark brown to black elongated microsclerotia on PDA. Conidiophores were verticillately branched and conidia were ellipsoidal to sub-cylindrical shape, and measured as $2.5{\sim}8.8{\times}2.0{\sim}3.8{\mu}m$. Pathogenicity tests by root dipping resulted in similar symptoms observed in the naturally infected chrysanthemum in fields.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2006.05a
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• pp.104-107
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• 2006

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1209-1211
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• 2012

최근 들어 모바일 단말기의 보급이 확대되면서 스마트 워크, NFC, USN등 사회 전반적으로 많은 분야에서 활용도가 높아지고 있다. 이에 본 논문에서는 모바일 단말기를 활용하여 농가에서 시설 원예작물의 생장 및 생산량을 예측하고 데이터를 관리하기 위한 연구를 진행하여 농가에서의 모바일 단말기 활용을 돕고 시설 원예작물의 재배에 도움이 되고자 한다.

• Journal of Bio-Environment Control
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• v.11 no.1
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• pp.5-11
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• 2002

In this study, new development of natural ventilation window was accomplished to control environment of greenhouse with no use of farced ventilation during hot season. The ventilation effect of developed ventilation window was investigated in experimental greenhouse which was designed using side wall panel and folding type panel fur natural ventilation. Folding panel type ventilation window was designed to open upper part of the side wall and top of the roof using two hinges which are located bottom of the side wall and the roof panel to grab one side of each panels and guide the other side along with the guidance rail. Developed ventilation window has top ventilation part with maximum moving distance X=ι (1-cos$\theta$)=848.5 mm and side ventilation part with maximum moving distance Y=ι/2 $\times$sin$\theta$=1,184.4 mm at 45$^{\circ}$ of theoretical opening angle. It took 4.5 minutes to open roof vent fully and temperature at 1.2 and 0.8 m height decreased after 1 minute from starting opening and became equilibrium state maintaining 3-4$^{\circ}C$ difference after 2 minutes from complete opening. Air exchange rate was 15.2~39.3 h$^{-1}$ which was more than 10~15 h$^{-1}$ of continuous type and Venlo type greenhouse. The descent effect of temperature by ventilation windows was two times higher than Venlo type greenhouse.

• Current Research on Agriculture and Life Sciences
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• v.33 no.1
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• pp.25-31
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• 2015

This study investigated the operation criteria of specialized complexes for horticultural production reflecting the farmers' preferences. First, the analysis of the communal activity included six factors: the group purchase of consumables for common activity, group purchase of the greenhouse apparatus, cooperative seed raising, use of a common air conditioning and heating system, cooperative shipping, and soil examination and certification system. The results of the Importance-Performance analysis can be summarized as follows. The factors requiring good management included the group purchase of consumables for common activity, group purchase of the greenhouse apparatus, and cooperative shipping. The factors with a lower priority included cooperative seed raising and the use of a common air conditioning and heating system. While the importance of the soil examination and certification system was low, the satisfaction was high, so this factor needs to be managed to avoid overkill. Second, the analysis of information exchange and education included six factors: production technique information, greenhouse facility management information, distribution-related information, production technique education, greenhouse facility management education, and distribution-related education. The results of the Importance-Performance analysis can be summarized as follows. The factor of production technique education was the most important determinant, plus the factors requiring good management included production technique information, greenhouse facility management information, and distribution-related information. The factors with a lower priority included greenhouse facility management education and distribution-related education. Therefore, to enhance productivity through facility modernization, the scaling up and creation of more specialized horticulture complexes are recommended as policy measures to gain export competitiveness. As the Korean government is expected to expand the scale of specialized horticulture complexes, the results of this paper can be widely utilized.

• Journal of Bio-Environment Control
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• v.31 no.4
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• pp.423-431
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• 2022

Due to increase of interest in 'carbon neutrality', attempts at agricultural use of CO₂ are increasing. In this study, we used the dry-ice made by CO₂ as by-product in thermoelectric power plant on CO₂ fertilization for production of leafy vegetable in greenhouses. The dry-ice was supplied on three leafy vegetable farms (Allium tuberosum Rottl. ex Spreng, Aster scaber, and Oenanthe stolonifera DC.) located in Hadong, Gyeongsangnamdo. Two greenhouses were used in each leaf vegetable crops, one greenhouse used as the control (non-treatment), other greenhouse used as supplied CO₂. For CO₂ fertilization, a gas sublimated from dry ice was supplied to the greenhouse using a specially designed prototype supply machine. A. tuberosum greenhouse has no difference of CO₂ concentration between the control, and CO₂ fertilization and shown high CO₂ concentration both greenhouses. However, the CO₂ concentrations in A. scaber and O. stolonifera greenhouses were increased in CO₂ fertilization treatment. The growth of A. scaber and O. stolonifera were increased in CO₂ fertilization, and the yield also increased to 36% and 25% than the control, respectively. As a result of economic analysis, the A. scaber has increase of income rate, however A. tuberosum and O. stolonifera has decreased income rate. Thus, the use of the dry-ice made by CO₂ as by-product in thermoelectric power plant has possibility to increase productivity of the leafy vegetable in greenhouse and have agricultural use value.

• Journal of Bio-Environment Control
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• v.27 no.1
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• pp.20-26
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• 2018

This study was conducted to develop a device for measuring the air flow by space variation through monitoring program, which acquires data by each point from each environmental sensor located in the greenhouse. The distribution of environmental factors(air temperature, humidity, wind speed, etc.) in the greenhouse is arranged at 12 points according to the spatial variation and a large number of measurement points (36 points in total) on the X, Y and Z axes were selected. Considering data loss and various greenhouse conditions, a bit rate was at 125kbit/s at low speed, so that the number of sensors can be expanded to 90 within greenhouse with dimensions of 100m by 100m. Those system programmed using MATLAB and LabVIEW was conducted to measure distributions of the air flow along the greenhouse in real time. It was also visualized interpolated the spatial distribution in the greenhouse. In order to verify the accuracy of CFD modeling and to improve the accuracy, it will compare the environmental variation such as air temperature, humidity, wind speed and $CO_2$ concentration in the greenhouse.