• Applied Chemistry for Engineering
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• v.18 no.6
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• pp.575-579
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• 2007

Sludge disposal technology has been studied with many researchers since disposal of sewage sludge has been a social problem. The current technologies include incineration, carbonization, pyrolysis, landfilling and fertilization. However, all of these processes require a dry process, because sewage sludge with more than 80% high water content is difficult to be used as a raw material. This study has the purpose to establish the optimal operation conditions and the technology as changing the variables: kiln residence time, sludge load, dryer temperature, by using the previous study that is rotary kiln type dryer designed as a numerical simulation study. As the results, optimum conditions are determined as follows: kiln residence time, sludge load, dryer temperature are $62.5kg/m^3{\cdot}hr$, 26.2 min, $330^{\circ}C$, respectively. Content of water, drying efficiency, weight loss, volume loss show that the results are $10{\pm}2$, 88, 80, 60%, and the dried sludge is released by a dryer below 10 mm.

• Journal of the Korean Applied Science and Technology
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• v.35 no.4
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• pp.1320-1326
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• 2018

This study investigated the antioxidant and neuronal cell protective effects of activity of water and 70% ethanol extracts from Stachys sieboldii Miq. according to different drying method(hot air drying and freeze-drying). The total flavonoid and total polyphenol content in water extracts was significantly higher after freeze-drying compared to hot air drying(p<0.05). DPPH and ABTS radical scavenging were increased in a dose-dependent manner. The DPPH and ABTS radical scavenging activity of water extract were significantly higher after free-drying compared to hot air drying(p<0.05). In a cell viability using MTT, the water extract according to hot air drying and freeze-drying of Stachys sieboldii Miq. showed protective effect against H2O2-induced nurotoxicity. The results suggest that the water extracts of Stachys sieboldii Miq. after freeze-drying has antioxidant activities and may be useful for neurodegenerative disorders.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2001.02a
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• pp.257-263
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• 2001

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2000.11a
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• pp.193-198
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• 2000

분무건조장치는 Solution, Slurry, Emulsion, Colloidal Suspension 등의 액상원료를 미립화하여 표면적을 증가시켜 수열면적을 크게 하여 열풍과 직접 접촉함으로써 순간적으로 건조를 행하여 액상원료로부터 바로 분립상의 제품을 얻는 건조법이다. 분유를 비롯하여 Instant 식품류, 합성세제, 염료, 안료, Ceramic, 공해 폐액의 처리에 이르기까지 폭넓게 이용되고 있다. 분무건조기는 통기, 회전, 기류 건조기 등 다른 건조기에 비하여 고도의 설계 및 제작 기술을 요하며, 설계에 있어서 일부 이론적인 취급이 행해지고 있는 것은 사실이나 아직은 경험에 의존하고 있는 현실이다. 국내에서 제작되고 있는 분무건조기의 열효율은 25-33%로 선진국의 35-48%에 비해 매우 낮다. 국내에서 사용되고 있는 분무건조기의 92%는 덴마크, 일본 등에서 수입된 것이다.(중략)

• Journal of Animal Environmental Science
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• v.8 no.3
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• pp.177-182
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• 2002

Drying process is very important for commercialization of velvet antlers. So far, artificial drying has mostly depended on experience of farmers resulting in low efficiency of drying, deterioration during drying, and contamination by dust and bacteria. Various drying techniques for high-quality production have currently been commercialized in some developed countries, and one of them is a drying technique using microwave. In this study, application of the technique using an electronic (microwave) oven for drying of velvet antler was investigated. The results of this study are as follows. 1. It was found that the drying period was significantly affected by cornification of velvet antlers. Accordingly, it can be assumed that the velvet antlers should partly be sliced to save drying period and required drying energy. 2. It was also found that the drying speed was changeable according to tempering period and even with same drying period. The tempering period should be controlled according to processing rate. 3. The results indicated that a repeated drying of 2-min drying and 3-min tempering is the most effective when a microwave oven was used. 4. The results also showed that the drying technique using microwave of electronic oven can be effectively used for drying of velvet antlers. 5. Only drying and tempering periods were examined in this study, however, ingredient change of deer antler after drying is necessary to be investigated in the future.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.9
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• pp.4030-4037
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• 2011

The purpose of this study was to investigate the correlation between oral dryness and stress and to collect baseline data for health promotion plan of college students. This research design is correlation study. Data of 835 were collected from May 2 to June 17, 2011, and analyzed using the SPSS PASW Statistics 18.0 Program. There was a statistical significant between oral dryness and perceived health status(p<.001). there were statistical significant in gender(p<.001), age(p<.001), grade(p<.01), major(p<.01), perceived health status(p<.001), exercise(p<.001), smoking(p<.001), drinking(p<.01) between general characteristics and stress. The mean score of oral dryness level was $12.89{\pm}10.15$ from 0 to 60 score range. Higher percentage in oral dryness action was "When I swallowing dry food, drink water or beverage"(48.7%). The mean score of stress was $7.17{\pm}4.78$ from 0 to 20 score range. Oral dryness level was positively related to stress(p<.01) and oral dryness action(p<.001). It is necessary to develop the educational program for health promotion of college students.

• 농업기술회보
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• v.45 no.5
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• pp.47-47
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• 2008

맛있는 밥맛을 지키기 위해서는 적기에 수확해서 알맞은 온도에 건조하고, 저장하는 기술이 무엇보다 중요하다. 따라서 제때에 수확하고, 수확 후 관리를 잘하여 품질 좋은 쌀을 생산하자.

• Environmental engineer
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• s.83
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• pp.38-41
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• 1993

• Journal of Korea Ship Safrty Technology Authority
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• v.17
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• pp.11-16
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• 2005

• Environmental engineer
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• s.146
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• pp.12-17
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• 1998