• 한국자원식물학회지
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• 제35권6호
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• pp.778-784
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• 2022

Wild vegetables, such as Cirsium setidens, and Aster scaber, are commonly distributed as dried materials because the wild vegetables lose their freshness quickly after harvest and distribution. Dried wild vegetables require rehydration to use as a food ingredient, and the quality of rehydrated wild vegetables is affected by pre-drying and drying methods. Here, we introduce the newly developed pre-drying and drying method, termed "micro oil sprayed thermal air (MOTA) technique". The three wild vegetables processed by the MOTA technique showed improved rehydration rate and reduced time to achieve maximum rehydration rate. Color characteristics were also improved in C. setidens. These results indicate that the MOTA technique improves the overall quality of rehydrated wild vegetables. It is expected that our findings could enhance the marketability of dried wild vegetables by improving overall quality and reducing preparation time.

• Applied Biological Chemistry
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• 제36권6호
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• pp.416-423
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• 1993

건조방법 및 원료성분을 달리하여 분유를 제조하고 이들분유의 몇 가지 리올로지 특성을 Instron Universal Testing Machine으로 측정하여 얻어진 결과는 다음과 같다. 드럼건조된 전지분유의 부피밀도는 $0.382\;g/cm^3$으로 탈지 및 조제 분유보다 높았고, 분무 건조된 탈지 분유의 Hausner ratio, 평정각 및 compressibility 는 각각 1.127, $32.5^{\circ}$, 0.029로 탈지 분유는 자유롭게 흐르는 것을 보여주었으며, 드럼건조된 전지분유의 compressibility는 수분 함량이 4.96%에서 3.89%로 감소함에 따라 0.079에서 0.052로 낮아졌다. 전지분유 그래뉼의 compressibility는 0.056으로서 분유의 compressibility보다 낮았다. 분무 건조된 분유는 구형으로서, 동결건조나 드럼건조된 분유보다 더 견고함을 나타냈다.

• 한국식품저장유통학회지
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• 제12권4호
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• pp.305-309
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• 2005

곶감은 상온 유통 시 백분과 곰팡이가 발생하고, 갈변과 조직의 경화가 일어난다. 이러한 문제점을 해결하여 상품성을 유지하고자 계피추출물처리와 포장재에 따른 곶감의 품질변화를 알아보았다. 그 결과 계피추출물에 곶감을 침지한 후 대조구(무포장), LDPE(low density polyethylene)필름포장구과 적층필름포장구(Nylon/LDPE)로 각각 포장하여 상온($15^{\circ}C$)에서 100일간 저장 시 다른 포장구 보다 적층필름포장구(Nylon/LDPE)가 중량변화는 $20.2\%$, 경도는 $87\%$, 갈변도는 $56\%$ 이상 낮게 나타났다. 표면색도 변화 역시 계피추출물 처리시 0.80으로 가장 낮은 변화를 보여, 저장 중 곶감의 품질이 다른 처리구에 비해 높게 유지됨으로써 상품성이 가장 높음을 알 수 있었다.

• 한국식품저장유통학회지
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• 제17권6호
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• pp.777-783
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• 2010

본 연구는 건조 연근을 포장방법(PE 필름, PP 필름, 마대, 종이봉투)과 저장온도(-5, 0, 10, $20^{\circ}C$)를 달리하여 품질의 변화를 알아보기 위해서 수분함량, 경도변화, 색도를 조사하였다. 저장기간 동안 수분의 함량은 PE, PP 포장재에서 종이봉투 및 마대 처리구 보다 수분함량이 높았으며, 저장온도가 낮을수록 수분함량이 낮게 나타났다. 한편, 마대와 종이봉투 포장재는 온도에 따 시료간의 수분함량 차이에 있어서 PE와 PP의 포장재와 달리 큰 차이를 나타냈다. 색상은 $-5^{\circ}C$에 저장한 마대 및 종이봉투는 저장 330일까지 h값이 안정적인 경향을 나타내었으나 0, $10^{\circ}C$, $20^{\circ}C$에서 저장한 마대, 종이봉투 포장재는 안정적이지 못한 경향을 나타냈다. 경도는 온도에 의해 약간 차이가 나지만 PE와 PP포장재가 다른 포장재보다 경도 값이 높았으며 또한 부패현상, 갈변반응 억제도 효과적인 결과를 나타냈다.

• International Journal of Industrial Entomology and Biomaterials
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• 제40권1호
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• pp.22-27
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• 2020

Silkworm powder was prepared from 3^rd day of 5^th instar silkworm through various drying technology including freeze drying, hot wind drying, infrared drying, and microwave drying. The shape of silkworm dried was different with the drying methods. Freeze drying and microwave drying silkworm looked its original form, but hot wind drying and infrared drying silkworm looked shriveled and crumpled. The color of silkworm powder freeze-dried changed from yellowish green to hazel with lowering freezing temperature. Heavy metals including Pb, Cd, As, and Hg were lower the food criteria. The results of 1-deoxynojirimycin analysis was shown that BaekOkJam and GoldenSilk silkworm powder was satisfied the criteria of functional food, but YeonNokJam silkworm powder was lower than the criteria. The amino acid composition of silkworm was similar regardless of the frozen temperature in freeze drying process.

• International Journal of Industrial Entomology and Biomaterials
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• 제39권2호
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• pp.74-81
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• 2019

Freeze-dried 3^rd day of 5^th instar silkworm powder (FDSP) has been produced and consumed as functional food ingredient in Korea. Generally, FDSP is distributed in the dehumidification state. In this study, the effect of humid condition (30%, 50%, 70%, and 90% RH) on the quality characteristics of FDSP was examined. The color of FDSP, greenish yellow, becomes dark with the change of redness and yellowness. When FDSP is exposed for 4 h at 90% RH, the lightness was changed from 56 to 51, redness from -0.8 to 3.7, and yellowness from 26.5 to 21.6. The proximate composition of FDSP was not significantly changed except 90% RH condition. At that condition, moisture content (5.7%) was increased to 26.8% and crude fat (11.3%) decreased to 1.9% (3 wk 90% RH). Mineral content change during storage can be classified to 3 types; sulfur rapidly decreased, potassium mostly stable with some decreased with humidity, and sodium increased with high humid condition. Vitamins were not significantly affected. However, DNJ was abruptly decreased to 0.03 g/100g in humid condition.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2012년도 춘계학술발표대회
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• pp.111.1-111.1
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• 2012

Interest in flexible transparent conducting films (TCFs) has been growing recently mainly due to the demand for electrodes incorporated in flexible or wearable displays in the future. Indium tin oxide (ITO) thin films, which have been traditionally used as the TCFs, have a serious obstacle in TCFs applications. SWNTs are the most appropriate materials for conductive films for displays due to their excellent high mechanical strength and electrical conductivity. In this work, the fabrication by the spraying process of transparent SWNT films and reduction of its sheet resistance on PET substrates is researched Arc-discharge SWNTs were dispersed in deionized water by adding sodium dodecyl sulfate (SDS) as surfactant and sonicated, followed by the centrifugation. The dispersed SWNT was spray-coated on PET substrate and dried on a hotplate. When the spray process was terminated, the TCF was immersed into deionized water to remove the surfactant and then it was dried on hotplate. The TCF film was then was doped with Au-ionic doping treatment, rinsed with deionized water and dried. The surface morphology of TCF was characterized by field emission scanning electron microscopy. The sheet resistance and optical transmission properties of the TCF were measured with a four-point probe method and a UV-visible spectrometry, respectively. This was confirmed and discussed on the XPS and UPS studies. We show that 87 ${\Omega}/{\Box}$ sheet resistances with 81% transmittance at the wavelength of 550nm. The changes in electrical and optical conductivity of SWNT film before and after Au-ionic doping treatments were discussed. The effect of Au-ion treatment on the electronic structure change of SWNT films was investigated by Raman and XPS.

• 방사선산업학회지
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• 제7권2_3호
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• pp.177-182
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• 2013

This study was conducted to evaluate the effect of gamma irradiation on the microbial populations of dried raw materials (9 products) and Saengsik powder. The samples were gammairradiated at doses of 2, 4, 6 and 8 kGy and the microbiological populations were evaluated. The total numbers of bacteria and Bacillus cereus in non-irradiated dried-raw materials for Saengsik powder was 1.3~3.4 and $1.7{\sim}2.4log\;CFU\;g^{-1}$. However, gamma irradiation reduced the microbiological populations in all samples, and Saengsik powder were sterilized at more than 6 kGy. Moreover, Clostridium perfringens were not observed in all samples within detection limit (<$1log\;CFU\;g^{-1}$). Therefore, the results of this study suggest that gamma irradiation at 6 kGy is sufficient to sterilize Saengsik powder, and thus, irradiated Saengsik powder at 6 kGy fulfills the microbiological requirements for sterilized food.

• 한국잠사학회:학술대회논문집
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• 한국잠사학회 1997년도 Progress and Future Development of Sericultural Science and Technology 40th Anniversary Commemoration Symposium
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• pp.133-158
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• 1997

Since 1992, Sericulture & Entomology Research Institute(NSERI) and Kyung Hee University group screened an activity of lowering blood-glucose levels with silkworm related materials such as silkworm larvae powder, dried feces, pupae and silkworm moth in other to guide laymans to rational and educated utilization of silkworm-related materials for the treatment of diabetes mellitus. In experiments examining several silkworms in different stages and prepared in different conditions, a freeze dried silkworm powder of 5th instar 3rd day showed a higher glucose lowering activity about 20% than heat dried matured silkworm powder. Among the three dosage of 500mg, 830mg and 1,160mg in ate preliminary clinical trial, the 830mg exhibited a significant effect on postprandial blood glucose level and did and did not cause any hypoglycemic side effect. In the blood glucose lowering activity of mulberry and silkworm varieties, the Yongcheonppong and Samkwangjam showed the highest activity for lowering blood glucose levels. In experiments to see the difference in blood-glucose lowering activity between either male and female or larvae and pupae, activity of larvae was higher than that of pupae and the male was higher than female. The heating dry and artificial diet showed lower than mulberry diet and normal freeze dry of the 5th instar 3rd day. Among the sericultural products, larvae showed the highest activity. We find out the fact that effect of silkworm powder attributed to the inhibition of ${\alpha}$-glucohydrolase catalyzed reaction in the small intestine.

• 한국재료학회지
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• 제9권12호
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• pp.1205-1210
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• 1999

분무건조법으로 용사용 원적외선 세라믹/알루미늄 복합분말을 제조하여 플라즈마 용사법으로 알루미늄 모재에 용사한 후, 미세구조, 결정상, 열충격저항성 그리고 분광복사율을 조사하였다. 분무건조된 복합분말의 입형은 구형으로 34~105${\mu}m $. 영역에서 높은 복사율을 보였다. 그러나 알루미늄 첨가량이 증가할수록 원적외선 방사특성은 감소하였다. 결과적으로 용사법으로 원적외선 방사특성의 큰 손실 없이 방사체를 제조하기 위해서는 20~30%wt%Al를 첨가하여 복합분말을 제조하는 것이 가장 효율적이라고 판단된다.