• The Korean Journal of Pesticide Science
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• v.19 no.3
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• pp.295-300
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• 2015

Currently, amount of export strawberry has been continuously increased to ship many south Asia countries, including Hong Kong and Singapore. In the distribution process, significant damage to the quality has been caused depending on the environmental conditions. Gray mold disease caused by Botrytis cinerea has been known as major damage to the export strawberry, and the disease was caused during shipping and distribution to the final consumers. This study was performed to assess the relationship between pathogen density in packing shed and disease incidence of gray mold during storage period. Maximum gray mold disease incidence in storage period was up to 16% with low temperature condition ($4^{\circ}C$). At room temperature condition, the disease incidence reached up to 100% even densities of the pathogen spore were recorded relatively low in the packing shed. As results of the study, the correlation between pathogen density in the air and disease occurrence clearly clarified.

• Journal of the Korean Wood Science and Technology
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• v.35 no.2
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• pp.61-68
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• 2007

The applicable scope of adhesives in the current society is broad and currently, several types of PVAc resin are sold in the market for adhesives. PVAc resin is primarily used for wood works and paper adhesion. However, the PVAc resin itself has the disadvantages that its viscosity is highly temperature- dependent and the work condition and viscosity get worse at the low temperature in the winter seasons. Although phthalate-based plasticizer is used to complement these disadvantages, adhesion strength and heat-resistance are weakened by adding the phthalate-based plasticizer and in the winter period, the amount of quantity should be increased. Also in a high-density product, it worsens the work condition by causing a rise of viscosity and delays curing and in a low-density product, it worsens the storage stability by causing separate precipitation. In addition to these, the phthalate-based plasticizer as a material of causing environmental hormones is currently restricted in the advanced countries for its amount of use and also in the domestic market, it is necessary to prepare for the situation. This study has not only eliminated the disadvantages of PVAc resin emulsion without adding a phthalate-based plasticizer of causing these problems, but also synthesized the PVAc resin for timber adhesion that is excellent in woodwork, thermal-resistance, water-resistance, storage stability, and adhesion performance. As the result, it has proven an excellent performance in thermal resistance, water resistance, storage stability, and minimum film forming temperature.

• Korean Journal of Food Science and Technology
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• v.22 no.7
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• pp.833-839
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• 1990

To examine the effects of nitrogen flushing on the storage stability of red pepper powders, the color and capsanthin and capsaicin contents were investigated. Capsanthin and capsaicin contents of red pepper powders during their storage decreased as the increase of temperature. Nitrogen flushing packaging was good for the retention of capsanthin and capsaicin than air packaging. Brown color of red pepper powders during their storage differed with storage temperature and packaging condition, thus low temperature and nitrogen reduced the brown color substantially, L and b values by Hunter's color were almost not changed during 10 months storage of red pepper powders, and a value was decreased as the increase of temperature. Therefore, nitrogen flushing packaging for the storage of red pepper powders was good than air packaging.

• 한국태양에너지학회:학술대회논문집
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• 2009.11a
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• pp.80-85
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• 2009

Mathematical modeling and performance simulation results were shown for the solar thermal storage system which used heat pipe. The thermal storage system was composed of thermal storage tank and charging/discharging heat exchanger with one by the heat pipes. Heat pipe heat exchanger was attached to system, and could carry out charging and discharging to thermal storage tank at the same time. Height of the thermal storage tank was 600 mm, and that of the charging/discharging heat exchanger was 400 mm. Length of the heat pipe was the same as the total height of thermal storage system, and outer and inner diameter were 25.4 mm(O.D.) and 21.4 mm(I.D.) respectively. Diameter of the circular was 43 mm(O.D.), and fin geometries were considered as the design parameters. High temperature phase change material(PCM), $KNO_3$ and low temperature PCM, $LINO_3$ were charged to storage tank to adjust working temperature. Total size of thermal storage system able to get heat capacity more than 500 kW was calculated and the results were shown in this study. Number of heat pipe was required more than maximum 500, and total length of thermal storage system was calculated to the more than maximum 3 m at various condition.

• Korean Journal of Weed Science
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• v.16 no.2
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• pp.114-121
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• 1996

This study was conducted to investigate seed germination, seedling growth, and responses to herbicides of Bidens tripartita L. When the field-collected seeds were stored under a dry-room temperature, dry-low temperature, wet-low temperature, or dry-high temperature condition, no seeds were germinated in a growth chamber with 14 hr photoperiod up to 35 days after the storage. Exceptionally, however, some seeds stored under a wet-room temperature condition were germinated after 25 days of the storage. This might be due to the fact that the seed coats were damaged by fungi which developed during the storage. Seeds stored under a wet-low temperature condition (stratification) began to be germinated after 3 months of the storage and the germination rate increased with a prolonged stratification. Almost all seeds were germinated after 9 months of the stratification. These results suggest that the dormancy of B. tripartita L. seeds relate to the seed coat and thus several attempts were made to induce seed germination through damaging or weakening the seed coat. Freezing($-20^{\circ}C$), drying($100^{\circ}C$), or swelling($40^{\circ}C$) of the seeds was not effective to induce the germination. Treatments of concentrated sulfuric acid, $KNO_3$, or gibberellin to the seeds had no effect on inducing the germination. However, ethrel had a stimulatory effect on the germination of the seeds with an optimum concentration of 250ppm. A seed cutting was also effective to induce the germination, but seedlings from the seeds had cutted cotyledons. Germination of the stratified seeds varied with the temperature condition to which they were subjected, but not with light. The germination rate was the highest at 35 - $40^{\circ}C$. Although the seeds were not able to germinate under a submerged condition, seedlings after 2-leaf-stage exhibited better growth under a submerged or a subirrigated condition than under an upland condition. Among the herbicides tested, pyrazosulfuton-ethyl, linuron, and bentazone were found to be effective for controlling B. tripartita L., having more herbicidal effect with an earlier application.

• Korean journal of food and cookery science
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• v.3 no.1
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• pp.20-30
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• 1987

Kyongdan is a kind of Korean rice cake made from glutinous rice powder. This study attempted to clarify the factors which affect the textural characteristics, and to examine the effects on sensory characteristics and texture of Kyongdan in various soaking time, temperature and volume of adding water in the preparation of Kyongdan. Evaluation was conducted through sensory evaluation and objective evaluation. The degree of gelatinization in various storage time and temperature were evaluated by $\beta$-amylase digestibility. The results were summarized as follows. 1. In preparation, the significant factors were the temperature and volume of water, number of kneading, condition of powder, and the relationships between soaking time and temperature of water and between volume and temperature of water and between volume of water and number of kneading and between volume of water and salt. 2. In sensory evaluation on the various soaking time and temperature and volume of water, the most favorite tendency on the overall quality was at the addition level of hot water of 25% with glutinous rice powder made by soaking for 12 hours. This condition corresponded to the low level of hardness, gumminess, chewiness and the high level of springiness and cohesiveness in comparision with Instron measurement. 3. The degree of gelatinization were decreased rapidly during two days of storage. In storage temperature, Kyongdan which was stored at $0^{\circ}C$, showed the most low level of the degree of gelatinization at the same storage time.

• Journal of Power System Engineering
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• v.14 no.4
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• pp.5-10
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• 2010

This study was investigated the effect on operating characteristics of apparatus according to frosting and defrosting to develop of new defrosting equipment. The results showed as following. Frost was almost removed using the defrosting equipment with roll brush type that defrosting is possible under operating condition. Also, the temperature of compressor inlet, evaporator inlet and outlet showed higher value because of heat transfer resistance of cooling pipe frost comparing with defrosting condition. And the compressor work showed 10% lower and COP was presented 24% higher values than defrosting condition. Therefore, defrosting for cooling coil of refrigeration and low temperature storage was effected on operation and performance characteristics of equipment. This highly effects on real refrigeration apparatus which is operated in year-around.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.16 no.3
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• pp.216-224
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• 1983

This work was undertaken to obtain some characteristics of proteolytic enzyme of marine gastropods such as sea hare, Aplysia kurodai, top shell, Turbo cornutus, and abalone, Haliotis discus hannai. An influence of pH, temperature and some chemicals on proteolytic activity of the crude enzyme extracted from digestive tract of the samples was taken into account and the stability of the enzyme during the storage at low temperature was also discussed. In comparison of the activities of the crude enzyme from the samples to the optimum conditions, it was characterized that abalone has twice or the more times higher activities than the other two species of the gastropoda in the acid and weak acid region, while, in the alkaline region, sea hare has six or the more times higher acitivities than the other two species. The proteolytic activity was facilitated by $Mn^{2+}$, some reducing agents, EDTA and DTT, and inhibited by $Hg^{2+}$ and SDS, but the other chemicals were not significantly affected to the activity. The low temperature storage of the enzymes of sea hare and top shell at $0^{\circ}C\;or\;-20^{\circ}C$ was not affected to the enzymic activity under the optimum pH condition except in the alkaline region. On the other hand, the low temperature storage was brought about no significant effect on the activity of the enzymes extracted from abalone under the optimum condition of the weak acid region, but apparently influenced to the activity under the optimum condition of the acid and alkaline region.

• Journal of Ginseng Research
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• v.29 no.2
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• pp.113-118
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• 2005

This study was to examine the effect of the opening ratio (area of spile hole/total surface area) of plastic container and storage temperature on physicochemical changes of fresh ginseng. At room temperature ($19\~23^{\circ}C$, RH $40\~61\%$), fungi and spoilage were observed 4 and 10 days, respectively after storing the fresh ginseng in a closed container. In storage container with $1\%$ opening ratio, fungi appeared 8 days after storage. In the container with $5\%$ and $10\%$ opening ratio, fresh ginseng showed excessive loss of moisture on the surface only after 4 days. The weight loss was most remarkable in the container with 5 and $10\%$ opening ratio. Content of maltose and sucrose decreased gradually in accordance with storage time but the extent of decreasing ratio was less significant in the container with lower opening ratio. At low temperature $(4\~9^{\circ}C,\;RH\;72\~92\%)$, no fungi but $10\%$ loss of weight was observed in the container with $5\%$ and $10\%$ opening ratio after 12 days storage. But in the tightly closed container and $1\%$ opening ratio for spiting, fresh ginseng showed good appearance even after 30 days of storage. Free sugars, especially maltose revealed gradual decrease but sucrose gradually increase following decrease at the beginning. This result suggests that storage condition of low temperature and opening ratio of plastic box less than $1\%$ can extend storage span of fresh ginseng significantly.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.29 no.1
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• pp.35-41
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• 2023

The purpose of this study was to examine the effect of each storage temperature condition of 5, 10, 15 and 20℃ to maintain the freshness of mini paprika (Capsicum annuum cv. New Raon Red) in corrugated box. Changes in general appearance, fresh weight loss, firmness, SSC (solid sugar content), and Hue angle were investigated. Furthermore, storage at temperatures ranging from 5℃ to 15℃ for 14 days resulted in maintaining freshness for 35 days. Paprika stored at 20℃ showed significantly higher loss of fresh weight and firmness than that of other storage temperatures. Furthermore, paprika stored at 5℃ and 10℃ showed a lesser decrease in hue angle than that at 15℃ and 20℃. However, the SSC of mini paprika was not significantly affected by storage temperature. These results suggest that corrugated box packaging in combination with low storage temperatures (5~10℃) could be effective in prolonging the shelf life of mini paprika. Therefore, the results represented that the low temperature storage in combination with cardboard box treatment could be effective in prolonging the shelf life of fresh paprika.