• The Korean Journal of Food And Nutrition
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• v.23 no.1
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• pp.23-29
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• 2010

Pigment concentrates with violet-red color and sweet taste were obtained from purple-fleshed sweet potato(PFSP) using ethyl alcohol and water. Extract from general potato(GP) were used as a control. The relative stability of PFSP pigment concentrate(PFSPPC) in a storage test over 15 days was confirmed in the order of dark > fluorescence > sun-light irradiation. The relative stability of GP pigment concentrate(GPPC) in a storage test over 15 days was confirmed in the order of sun-light > fluorescence > dark storage. The RRP of PFSPPC was higher than that of GPPC, but the color strength of GPPC was 1/2 that of PFSPPC. Treatment of PFSPPC with aluminum potassium sulfate(0.2~0.3%, w/w) best improved its stability. The improved RRPs of PFSPPC were 45.16~47.31% in sun light irradiation, 55.91~60.22% in fluorescence irradiation, and 76.34~75.97% in dark storage conditions. In substituting aluminum potassium sulfate for chitosan, an amount of 0.2~0.3%(w/w) was suitable, giving similar results in improving pigment stability for all concentrates tested. Also, freeze-dried PFSPPC powder was manufactured as a substitute for dextrin, and also as a substitute for chitosan to the extent of 0.25%(w/w). The results of storage stabilite for freeze-dried PFSPPC and GPPC powder over 15 days, irradiation were, PRRs of 74.47~89.36% and 61.54~76.92%, respectively. The stability improving effect of freeze dried PFSPPC powder was confirmed by the results of storage experiments at various conditions. The use of freeze-dried PFSPPC powder was therefore confirmed to be an effective treatment for general foods.

• Journal of Internet of Things and Convergence
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• v.10 no.2
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• pp.125-130
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• 2024

With the rapid growth of mobility technology, the industrial sector is demanding storage devices that can reliably process data from various equipment and sensors in vehicles. NAND flash memory is being utilized as a storage device in mobility environments because it has the advantages of low power and fast data processing speed as well as strong external shock resistance. However, flash memory is characterized by data corruption due to long-term exposure to high temperatures. Therefore, a dedicated system for temperature management is required in mobility environments where high temperature exposure due to weather or external heat sources such as solar radiation is frequent. This paper designs a dedicated temperature management system for managing storage device temperature in a mobility environment. The designed temperature management system is a hybrid of traditional air cooling and water cooling technologies. The cooling method is designed to operate adaptively according to the temperature of the storage device, and it is designed not to operate when the temperature step is low to improve energy efficiency. Finally, experiments were conducted to analyze the temperature difference between each cooling method and different heat dissipation materials, proving that the temperature management policy is effective in maintaining performance.

• Journal of The Korean Society of Agricultural Engineers
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• v.48 no.2
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• pp.45-55
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• 2006

This study analyze the hydrologic conditions and the effects of selected runoff characteristics as an attempt to estimate the optimal dredge amount for Asan Lake in Korea. The runoff feature was calculated by utilizing the water balance simulation from DIROM (Daily Irrigation Reservoir Operation Model), which allowed changes in landuse to be quantified using remote sensing for 14 years. The distribution of prospective sediment deposits was been tallied based on the changes in landuse, and quantity of incoming sediment estimated. From these findings, we were then able to simulate the fluctuation of water level, gauging the pumping days not already in use, to determine the frequency of the distribution for around the. requirement annual water storage and the changing water level. The optimal dredge amount was calculated on the basis of the distribution of frequency, taking into account the design criteria for agricultural water with the 10-year frequency of resistant capacity.

• Korean journal of food and cookery science
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• v.21 no.1 s.85
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• pp.24-32
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• 2005

Changes in apple slices during cold storage were investigated by evaluating the physical properties such as degree of browning and compression force. Chemical properties such as PPO activity and total phenol contents were also determined and sensory evaluation was carried out. The correlation analysis between browning parameters was conducted. Degree of browning was increased in the order of fresh apple slice, water-dipped apple slice, $0.5\%$ ascorbic acid solution-dipped apple slice and CP(caramelization product) from sucrose-dipped apple slice. PPO activity was increased in the order of fresh apple slice, water-dipped apple slice, $0.5\%$ ascorbic acid solution-dipped apple slice and CP(caramelization product) from sucrose-dipped apple slice. Amongst several treatments, CP from sucrose-dipped apple slice showed the lowest degree of browning and PPO activity. Total phenol contents were decreased from 60 to 56.2 mg and from 59.6 to 56.0 mg in fresh apple slice and water-dipped apple slice, respectively, but CP from sucrose-dipped apple slice and $0.5\%$ ascorbic acid solution-dipped apple slice were increased from 51.9 to 52.8 mg and from 54.1 to 54.4 mg, respectively, showing the smallest changes when compared with fresh apple slice and water-dipped apple slice. Compression forces of apple slices during cold storage were decreased in the order of fresh apple slice, water-dipped apple slice, $0.5\%$ ascorbic acid solution-dipped apple slice and CP from sucrose-dipped apple slice. In sensory evaluation of apple slices during cold storage, CP from sucrose-dipped apple slice had higher score than the other treatments. In addition, a significant correlation was observed among degree of browning, PPO activity and phenol content. Therefore, CP from sucrose-dipped apple slice seems to be effective in controlling of enzymatic browning during cold storage. In addition, CP from sucrose-dipped apple slice seems to be effective on other several factors. These results suggest that CP from sucrose should be a potential source for controlling enzymatic browning during storage of vegetables and fruits.

• Asian-Australasian Journal of Animal Sciences
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• v.16 no.4
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• pp.581-587
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• 2003

This study was designed to examine the effect of icroencapsulated iron fortified drink yogurt and vitamin C as a bioavailable helper of iron on chemical and sensory aspects during 20 d storage. Coating material was polyglycerol monostearate (PGMS), and ferric ammonium sulfate and vit C were selected as core materials. The highest efficiency of microencapsulation of iron and vit C were 73% and 95%, respectively, with 5:1:50 ratio (w/w/v) as coating to core material to distilled water. Iron fortification did not affect the fermentation time required for the drink yogurt to reach pH 4.2. The addition of uncapsulated iron decreased the pH during storage. TBA absorbance was significantly lower in capsulated treatments than in uncapsulated treatments during storage. In sensory aspect, the yogurt sample added with uncapsulated iron and vit C, regardless of capsulation, showed a significantly high score of astringency, compared with those of control and other groups. A significantly strong sourness was observed in treatment containing capsulated iron and uncapsulated vitamin C at every time interval. The present study provides evidence that microencapsulation of iron with PGMS is effective for iron fortification in drink yogurt.

• Korean journal of food and cookery science
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• v.21 no.6 s.90
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• pp.776-781
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• 2005

Preparation of nectar using Kabocha squash was optimized and the quality changes during 7 weeks'storage were investigated. The paste for the nectar base could be effectively obtained by consecutive processes of steaming for 15 min, crude smashing and homogenization. To improve the mouth-feel of the nectar, various pectinases and cellulases were treated with Econase CE, Rapidase press, Macerozyme A, Sumizyme MC and Cytolase M102. Among them, Cytolase M102 was the most effective enzyme at $0.05\%$ for 90 min reaction in terms of the collective results as the residue of the nonsoluble solids, viscosity and alcohol test. The best ratio of the nectar ingredients was a ratio of water to paste of 1.5, $11^{o}$Brix of saccharinity, $0.025\%$ of citric acid and $0.15\%$ of xanthan gum. When the retort sterilized nectar in a can was stored in an incubator at $35^{\circ}C$ for 7 weeks, the color, pH, saccharinity, viscosity and total count plates remained almost unchanged.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.10 no.4
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• pp.221-226
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• 1977

The quality changes of yellow sea bream, Branchiostegus japonicus japonicus, during frozen storage were mentioned from the view point of commercial value. The experiments were conducted to find out the effective storing method by varying the storage temperatures $(-5^{\circ}C,\;-35^{\circ}C)$ and pretreatment with chemicals $(0.l\%\;BHA,\;1\%\;sodium\;Polyphosphate)$. The samples were stored for 6 months at $-5^{\circ}C$ and $-35^{\circ}C$ after dipping in the chemical solutions and packing with polyethylens film. The extractibility of salt soluble protein of sample stored at $-35^{\circ}C$ was higher than that of samples stored at $-5^{\circ}C$, while the chemical treatments were not so much effective. Difference in the amount of free water released from samples was obvious between $-5^{\circ}C$ and $-35^{\circ}C$ storage, and that of samples treated with sodium Polyphosphate was much less than the BHA-treated ones. VBN content was differed by varying the storage temperature whereas no effect by the chemical treatments. TBA value of the sample storage at $-35^{\circ}C$ was lower than $-5^{\circ}C$ and the effect of chemicals on the development of oxidation was in order of sodium polyphosphate, BHA and control. Carotenoid content also changed by varying the storage temperature and the color was completely faded out with quality deterioration after 3 months storage at $-5^{\circ}C$.

• Journal of Korean Society for Geospatial Information Science
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• v.13 no.1 s.31
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• pp.11-17
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• 2005

A lot of small-scale reservoirs that is extravagant in whole country are controlled state or real condition that correct data about the practice contents is not equipped all up to now. In this study, YungNam districts that region Gyeong-Ju city reservoir is distributed much of when flow speedily choose 23 peace among 73 small scale reservoir and experimented. Acquired data every 5 seconds, and user E/S and user value TS for orthocenter to 1 second interval and executes present condition measurement using RTK-GPS. Could was wave and state that reservoir of 15 places (about 65%) gives protective care that do 3D modelling with acquired data, and now correct contents about reservoir state past through comparative analysis with data. Also, area of full water and wave that analyze effective storage and area of full water of 23 places reservoir could know that 20.63%, effective storage decreased as 3.34%. I wish to contribute about analysis about present reservoir state through this and method the adminstration direction.

• Journal of the Korean Geophysical Society
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• v.9 no.2
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• pp.113-120
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• 2006

A lot of small-scale reservoirs that is extravagant in whole country are controlled state or real conditionthat correct data about the practice contents is not equipped all up to now. In this study, YungNam districts that region Gyeong-Ju city reservoir is distributed much of when flow speedily choose 23 peace among 73 small scale reservoir and experimented. Acquired data every 5 seconds, and user E/S and user value TS for orthocenter to 1 second interval and executes present ondition measurement using RTK-GPS. Could was wave and state that reservoir of 15 places (about 65%) gives protective care that do 3D modelling with acquired data, and now correct contents about reservoir state past through comparative analysis with data. Also, area of full water and wave that analyze effective storage and area of full water of 23 places reservoir could know that 20.63%, effective storage decreased as 3.34%. I wish to contribute about analysis about present reservoir state through this and method the adminstration direction.

• 한국태양에너지학회:학술대회논문집
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• 2009.11a
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• pp.56-61
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• 2009

Paradigm depending only on fossil fuel for building heat source is rapidly changing. Accelerating the change, as it has been known, is obligation for reducing green house gas coming from use of fossil fuel, i.e. reaction to United Nations Framework Convention on Climate Change. In addition, factors such as high oil price, unstable supply, weapon of petroleum and oil peak, by replacing fossil fuel, contributes to advance of environmental friendly renewable energy which can be continuously reusable. Therefore, current new energy policies, beyond enhancing effectiveness of heat using equipments, are to make best efforts for national competitiveness. Our country supports 11 areas for new renewable energy including sun light, solar heat and wind power. Among those areas, ocean thermal energy specifies tidal power generation using tide of sea, wave and temperature differences, wave power generation and thermal power generation. But heat use of heat source from sea water itself has been excluded as non-utilized energy. In the future, sea water heat source which has not been used so far will be required to be specified as new renewable energy. This research is to survey local heating system in Europe using sea water, central solar heating plants, seasonal thermal energy store and to analyze large scale central solar heating plants in German. Seasonal thermal energy store necessarily need to be equipped with large scale thermal energy store. Currently operating central solar heating system is a effective method which significantly enhances sharing rate of solar heat in a way that stores excessive heat generating in summer and then replenish insufficient heat for winter. Construction cost for this system is primarily dependent on large scale seasonal heat store and this high priced heat store merely plays its role once per year. Since our country is faced with 3 directional sea, active research and development for using sea water heat as cooling and heating heat source is required for seashore villages and building units. This research suggests how to utilize new energy in a way that stores cooling heat of sea water into seasonal thermal energy store when temperature of sea water is its lowest temperature in February based on West Sea and then uses it as cooling heat source when cooling is necessary. Since this method utilizes seasonal thermal energy store from existing central solar heating plant for heating and cooling purpose respectively twice per year maximizing energy efficiency by achieving 2 seasonal thermal energy store, active research and development is necessarily required for the future.