• Journal of the Korean Society for Precision Engineering
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• v.31 no.10
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• pp.873-879
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• 2014

UV curable adhesives with different acrylic functionalities were synthesized for temporary bonding and debonding process in 3D multi-chip packaging process. The aim is to study various factors which have an influence on UV curing. The properties and curing behaviors were investigated by gel fraction, peel strength, probe tack, and shear adhesion failure temperature. The results show that the properties and curing behaviors are dependent on not only acrylic functionalities of binders but also UV doses and coating thickness.

• Environmental Engineering Research
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• v.20 no.4
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• pp.403-409
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• 2015

This study aims to investigate the use of a floating media filter (FMF) to eliminate waterborne microorganism in treated domestic wastewater for reuse in agriculture. A conventional sand filter (SF) was used concurrently to compare treated water quality. The total/fecal coliforms and somatic coliphage were employed as fecal indicators. The result showed that the FMF was fed with 3 times higher infiltration rate ($15m^3/m^2.h$) than that in the SF ($5m^3/m^2.h$), in which both filters gave similar coliform removal at 6 hours operation. The somatic coliphage elimination tended to increase with operational time for the FMF while that of the SF showed decreasing trend. When a 24 hour continuous operation was applied for the FMF, it showed better removal of somatic coliphage (78%), fecal coliforms (60%) and total coliforms (56%) than that of 6 hour operation. In conclusion, the FMF gave better performance than the SF did by producing a good quality of treated water for agriculture in terms of waterborne microorganisms including turbidity and suspended solids.

• Korean Journal of Soil Science and Fertilizer
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• v.44 no.1
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• pp.84-90
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• 2011

It is imperative to study the hydrolysis of urea in high saline-sodic condition of a newly reclaimed tidal land in order to overcome the problems associated with use of urea fertilizer. The methodology adopted in this study tried to get a convenient way of estimating rate for N transformation needed in N fate and transport studies by reviewing pH and salt contents which can affect the microbial activity which is closely related to the rate of urea hydrolysis. The hydrolysis of urea over time follows first-order kinetics and soil urease activity in reclaimed soils will be represented by Michaelis-Menten-type kinetics. However, high pH and less microorganisms may delay the hydrolysis of urea due to decrease in urease activity with increasing pH. Therefore, the rate of urea hydrolysis should adopt $V_{max}$ referring enzyme activity ($E_0$) accounting for urease concentration which is indicative for urea hydrolysis, especially in a high saline and sodic soils.

• Korean Journal of Environmental Agriculture
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• v.34 no.3
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• pp.196-203
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• 2015

BACKGROUND: Purpose of this research is HPLC analysis method development of lycopene in tomato. And then, three components of carotenoid in four kinds of tomatoes (general tomato, cherry tomato, red and orange date tomato) were compared with each other. METHODS AND RESULTS: Lycopene in tomato was extracted with hexane likes other carotenoid components using 500 mg of dried powder sample. HPLC analysis conditions were column temperature ($40^{\circ}C$), detection wavelength (454 nm), flow rate (1.0 mL/min) and injection volume ($20.0{\mu}L$). Lycopene was analyzed by the gradient elution ($60{\rightarrow}100%$) of the mobile phase solvents A[water: methanol=25: 75 (v/v)] and B[ethyl acetate]. CONCLUSION: Three components of carotenoids (lutein, ${\beta}$-carotene, lycopene) were observed in tomatoes. The total carotenoid contents was the highest in red date tomato (662.0 mg/kg dry wt.) and the lowest in orange date tomato (111.3 mg/kg dry wt.). Lycopene contents in tomatoes was the highest percentage (93%) among all the carotenoids.

• Polymer Science and Technology
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• v.26 no.1
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• pp.40-46
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• 2015

• Journal of Mushroom
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• v.22 no.1
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• pp.8-16
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• 2024

Paecilomyces tenuipes (P. tenuipes) is a fungus cultivated artificially by South Korean researchers, utilizing rice bran as its substrate. The increased demand for this fungus has not been met with successful cultivation methods for fruiting body production in natural environments. Therefore, we tested the effect on the growth of P. tenuipes using a Solid media based on pests. In this results, the Solid media based on M.alternatus was effective in increasing the growth of P. tenuipes and the content of cordycepin. Moreover, we confirmed the conditions for manufacturing a Solid media based on M.alternatus for P. tenuipes growth. We suggested that the growth-promoting compounds offers valuable insights for optimizing fungal cultivation conditions, thereby enhancing productivity and contributing to a broader understanding of fungal physiology in varying nutritional environments.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2011.10a
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• pp.15-15
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• 2011

Vietnam is one of a country with an important strategic position in economic development in the Asia Pacific region. In addition, Vietnam has a longtime agricultural more than 70% of agricultural labor. With favorable natural conditions, agricultural growth in Vietnam is'key'to the developing countries. However, Vietnam's agriculture has still encounter many problems due to drought, climatic conditions, natural disasters. The level of development and agricultural production is weak, the process of post-harvest storage is limited and particularly agricultural competitiveness with other countries is obstacles. In fact, the Government of Vietnam decided to cooperate with other countries have highly developed agriculture such as America, Korea, Japan... hoping to get help and promote agricultural development in a sustainable manner. Since 1992, Vietnam and Korea established formal diplomatic relations. During 20 years of cooperation and development, We have been obtained many satisfactory results not only in fields invest infrastructure, technological science but also exchange experience especially in the agricultural sector. From the Korea ODA project, Vietnam's agriculture in general has made significant progress. With vision, ODA projects continues to support the Central Highlands region in which the Da Lat city, Lam Dong province. Pass the cooperation between Dongguk University and Da Lat University has many positive results. Hopefully in the near future, the relationship between Vietnam and Korea in general will continue to grow strongly, the Korea ODA project will be continue to support Vietnam's agriculture in general and in particularly for the Central Highlands which in Da Lat City, Lam Dong province.

• Journal of Forest and Environmental Science
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• v.39 no.4
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• pp.246-253
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• 2023

Salix gracilistyla is widely distributed along riversides in Korea and very good for biomass production by SRC because of its excellent germination ability, but it is necessary to measure drying tolerance for cultivation. The drought tolerance of S. gracilistyla was tested using cuttings, and growth and physiological analysis were performed after irrigation was stopped. The growth inhibition of S. gracilistyla was observed from the day irrigation was stopped, and the soil moisture content decreased to less than 10% on the 25th day after irrigation was stopped. Over 50% of the seedlings turned brown 25 days after watering was stopped. The chlorophyll content of S. gracilistyla decreased dramatically after 25 days of stopping of irrigation. RWC values were unchanged until day 12 after irrigation was stopped but decreased rapidly until day 21, but there was a slightly decreasing trend after that. RWL levels increased slightly during irrigation stops. The proline content of plants subjected to drought stress was 0.91-2.63 mg/0.05 g, 2.75 times higher than that of the control treatment. The sugar content of the drought stress treatment group was 29.77 to 350.66 mg/0.05 g, which increased 12.24 times that of the control treatment. As a result of this study, S. gracilistyla was found to have a drought tolerance almost comparable to that of evergreen broad-leaved trees growing on the land. This study is expected to contribute to the resource utilization S. gracilistyla, a native willow tree of Korea, and the mass production of biomass by SRC.

• Natural Product Sciences
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• v.24 no.2
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• pp.79-81
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• 2018

Norcolensoic acid (1) was isolated from both the fruiting bodies and the liquid culture of Lachnum virgineum. The structures of 1 was determined using spectroscopic methods. Compound 1 was isolated for the first time from this fungus. Compound 1 showed moderate antibacterial and phytotoxic activities.

• Polymer Science and Technology
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• v.23 no.1
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• pp.47-60
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• 2012