• Food Science and Preservation
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• v.13 no.2
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• pp.131-137
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• 2006

In order to reduce the damage of effective component during processing, we carried out hot-water extraction monitering in Gastrodia elata Blume by response surface methodology. The extraction con야tions for vanillyl alcohol, vanillin and coumarin were optimized at 91.07, 93.73 and $96.30^{\circ}C$, for 2.64, 2.58 and 3.84 hr, at the concentration of 15.16, 21.56 and 19.88 mL/g, respectively. The optimal condition for extraction of total phenolics was acheved at $98.14^{\circ}C$, 3.20 hr and 18.63 mL/g. This study elicited regression formula for each variable, and superimposed the total optimal conditions of extraction for effective compounds and optimal condition for antioxidant characteristics dividing processing factors. It is shown that the predicted result under the extraction condition as follows: extraction temperature for $90{\sim}100^{\circ}C$, extraction time for $3{\sim}4hr$, and solvent volume of $15{\sim}20mL/g$ of sample.

• Food Science and Preservation
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• v.13 no.6
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• pp.691-696
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• 2006

This study was carried out to analyze useful component in freeze-dried persimmon flower powder made from six cultivais. The cultivais were Dogunjosang, Kojongsi, Kabjubaeknok, Chalang, Weolhasi and SangjuDungsi. Powder of persimmon flower was prepared by milling after freeze drying at $-70^{\circ}C$. Crude lipid was the highest in Dogunjosang (57.26%). Major free sugars of the persimmon flowers were fructose ($95{\sim}310mg%$), glucose ($75{\sim}281mg%$) and sucrose ($7{\sim}28mg%$). Major organic acids were malic acid (225 mg% in Kabjubaeknok (Jun. 4th)) and tartaric acid (189 mg% in Kabjubaeknok (Jun. 4th)). Predominant free amino acids were hydroxy-L-proline(25.33 mg% in Weolhasi), L-citrulline (58.83 mg% in SangjuDungsi (May 280)) and L-threonine (11.88 mg% in SangjuDungsi (May 280)). Major phenolic compounds in the persimmon flowers were caffeic acid ($1,946{\mu}g/100 g$ in Kabjubaeknok (Jun. 4th)), p-hydioxybenzoic acid($418{\mu}g/100 g$ in SangjuDungsi (May 29th)) and protocatechuic acid($181{\mu}g/100 g$ in Kabjubaeknok(Jun. 1st)). The results suggest that persimmon flowers be potential materials as useful food ingredients.

• Journal of Bio-Environment Control
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• v.24 no.2
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• pp.106-112
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• 2015

The objective of this study was to examine the growth reaction of strawberry plants to the mixed red and blue LED sources and their installation method. The artificial light sources were : LED PAR(PPFD $2{\sim}4{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$), LED BAR(PPFD $100{\sim}120{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$) and incandescent(PPFD $2{\sim}4{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$) lamp. The lighting treatment was started at the first cluster flowering period as a night breaking lighting and was applied during 3 hours, between 22:00 and 01:00 every day. Plant height and leafstalk length were longer in plants treated with incandescent lamp, where as fresh and dry weight of shoot were heavier in LED PAR compared to incandescent lamp treatment. LED PAR treatment also resulted in the largest leaf area, chlorophyll content was increased by $0.36mg{\cdot}g^{-1}$ after 60 days from the starting of the artificial lighting. According to the experimental results application of 16W LED PAR lamps and W-type installation method can improve light environment in strawberry lighting culture.

• Korean Journal of Food Science and Technology
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• v.25 no.5
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• pp.576-581
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• 1993

Polygalacturonase(PG) was extracted from Chinese cabbage and partially purified by ammonium sulfate fractionation and ion-exchange chromatography. Three fractions, D-PG, C-1 PG, and C-2 PG, were separated by CM-Sephadex C-25 column chromatography and FPLC Mono Q HR 5/5 or Mono S HR 5/5 column and their physicochemical characteristics were investigated. All three fractions had optimum pH and temperature of 4.5 and $65^{\circ}C$, and were stable in the range of pH $4.5{\sim}8.0$. These fractions were inhibited by 0.8mM $CaCl_2$ or 0.6M NaCl. In the thermal inactivation of PC isozymes at $65{\sim}80^{\circ}C$, z-values were $8.4{\sim}9.3^{\circ}C$ and D-values at $80^{\circ}C$ were In the range of $120{\sim}126s$. Thermodynamic constants were calculated from thermal inactivation data of the isozymes and were applicable to estimation of thermal process time of retort pouched Kimchi.

• Journal of Biosystems Engineering
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• v.37 no.1
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• pp.1-10
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• 2012

Purpose: The most important element of an agricultural helicopter is the rotor blade realizing lift force. In order to improve the performance of the rotor blades, two types (KA152313 and KB203611) of airfoils were designed and compared. Methods: The nose shape of the KB203611 airfoil was 'drooped' and 'sharp' compared to the leading edge of the KA152313 airfoil. The performance of the experimental airfoils was simulated using CFD-ACE program, and lifts were measured in situ using the 'AgroHeli-4G', a prototype helicopter. Results: Simulated lifts of the blade with the KA152313 airfoil showed proper values for a wide range of angles of attack between $14^{\circ}{\sim}18^{\circ}$, while the simulated lift of the KB203611 blade exhibited maximum values near $13^{\circ}{\sim}14^{\circ}$. In the lift measurements, the range of operable angles of attack was a collective pitch angle at the grip (GP) of $12^{\circ}{\sim}18^{\circ}$ for the KA152313 blade. On the other hand, the range of angles of attack for the KB203611 blade was a GP of $12^{\circ}{\sim}14^{\circ}$. Conclusions: The blade of KA152313 performed well over a wide range of AoAs and the blade of KB203611 performed better at low AoAs. In this study, a variative airfoil blade, gradually emerging from grip to tip using the two different airfoils, was suggested.

• Korean Journal of Environmental Agriculture
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• v.32 no.4
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• pp.245-251
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• 2013

BACKGROUND: The objectives of this study are to investigate the contamination levels of heavy metals in soil, ground water, and agricultural product near the abandoned Boeun and Sanggok mine areas in Korea and to assess the health risk for these local residents exposed to the toxic heavy metals based on analytical data. METHODS AND RESULTS: By the results of human health risk assessment for local residents around Boeun and Sanggok, human exposure to cadmium, copper, arsenic from soil and to lead, cadmium, and arsenic from rice grain were higher in Sanggok, but human exposure to zinc and arsenic from ground water was higher in Boeun. By the results of hazard index (HI) evaluation for arsenic, cadmium, copper, lead, and zinc, HI values in both areas were higher than 1.0. This result indicated that the toxicity hazard through the continuous exposure to lead, cadmium, arsenic from rice, ground water, and soil would be likely to occur to the residents in the areas. Cancer risk assessment for arsenic, risks from the rice were exposed to one to two out of 10,000 people in Boeun and one of 1,000 people in Sanggok. These results showed that the cancer risks of arsenic in both areas were 10~100 times greater than the acceptable cancer risk range of US EPA ($1{\times}10^{-6}{\sim}1{\times}10^{-5}$). CONCLUSION(S): Therefore, if these two local residents consume continuously with arsenic contaminated soil, ground water, and rice, the adverse health effects (carcinogenic potential) would be more increased.

• Journal of Mushroom
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• v.5 no.2
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• pp.81-85
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• 2007

This study was carried out to investigate the conditions of liquid culture and fruiting body formation of Cordyceps militaris using grain mediacontained the brown rice and black purple rice. Liquid mycelial growth and density of Cordyceps militaris were the highest in the medium of malt extract 0.7% and pH 5.0~5.5. The optimal condition of formation the fruiting bodies were shown to be temperature of $17^{\circ}C$, light intensity of 600 lux, $C0_2$ of 500ppm and humidity intensity of 95% produced highest amount of fruit bodies.

• The Journal of the Korea institute of electronic communication sciences
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• v.18 no.5
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• pp.989-998
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• 2023

As diseases are already increasing due to aging population and changes in eating habits, interest in digital healthcare is increasing. According to the 2020 Elderly Status Survey, 84% of South Koreans aged 65 and older suffer from at least one chronic disease, and the number and duration of drugs taken by the elderly are also increasing. Effective management that enhances compliance of chronic disease patients can prevent the onset of complications, thereby averting progression to severe illnesses. Thus, a proper medication-taking habit is crucial. This paper proposes a medication information retrieval system using OCR technology. By leveraging Google Cloud Vision API, the system detects and recognizes the names of medicines. Once recognized, the medication name is searched in a database to provide users with medication information and medication schedule management services. By providing accurate medication information through the search, it is possible to induce changes in medication methods and habits. By eliminating the inconvenience of direct input through OCR technology, we anticipate enhancing user convenience by promptly delivering information.

• Korean Journal of Agricultural Science
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• v.38 no.1
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• pp.115-120
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• 2011

20% of total energy use to sustain temperature of building inside. In this reasons, researchers effort to improve the thermal insulation capacity with new wall system. Using appropriate materials and consisting new wall system should considered in energy saving design. OSB(Oriented strand board), Larch lining board used to consist wall system. $2{\sim}6$ Larch lining board has tongue & groove shape for preventing moisture. Comparing with gypsum board and green timber lining board as interior sheathing material, temperature difference of Green timber wall system was bigger than temperature difference of gypsum board wall system. This aspects indicate that Green timber wall system was revealed higher thermal insulation property than gypsum board wall system. Gypsum board portion transfer heat easily because temperature difference gradient of gypsum board wall system was smaller than OSB wall system. Total temperature variation shape of G-4-S and G-6-S show similar model but, temperature variation shape in green timber wall portion assume a new aspect. The purpose of this study was that possibility of thermal insulation variation and new composition of wall system identify to improve thermal insulation performance. In the temperature case, this study shows possibility of improving thermal insulation performance. Humidity, sunshine and wind etc. should considered to determine building adiabatic properties.

• 한국생물공학회:학술대회논문집
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• 2001.11a
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• pp.829-832
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• 2001

Phage display technique as a new antibody production method can express the protein on the minor coat of phage particle in a library constructed by utilizing a recombination of genes coding the variable regions of immunoglobulin. This new method is particularly advantageous in producing antibodies against toxic substances and compounds with low immunogenicities. We first confirmed the concept of antibody expression on the phage particle by selecting a positive control of the phage library (e.g., Griffin.l donated from MRC center in England). The library was then employed to produce antibodies specific to human serum albumin via repetitive bio-panning procedure. The mean affinity of the antibodies selected gradually increased along with the number of bio-panning, which demonstrated that the phage display method could produce monocloanl antibodies with high affinities.