• Journal of Biosystems Engineering
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• 제27권1호
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• pp.45-50
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• 2002

This study was performed to develop thin layer drying equations fur short grain rough rice using far-infrared ray. Thin layer drying tests was conducted at four far-infrared ray temperature levels of 30, 40, 50, 60$^{\circ}C$ and two initial moisture content levels of 20.7, 26.2%(w.b.). The measured moisture ratios were fitted to Lewis and Page drying models by stepwise multiple regression analysis. Half response time of drying was affected by both drying temperature and initial moisture content at drying temperature of below 40$^{\circ}C$, but at above 40$^{\circ}C$ was mainly affected by drying temperature. Experimental constant(k) in Lewis model was a function of drying temperature, but K and N in Page model were function of drying temperature and initial moisture content. Moisture ratios predicted by two drying models agreed well with experimental values. But in the actual range of drying temperature above 30$^{\circ}C$ Page model was more suitable for predicting of drying rates.

• 한국식품영양과학회지
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• 제35권5호
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• pp.635-640
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• 2006

각 처리구별 찰옥수수를 원적외선 건조기를 사용하여 건조한 후 진공포장하여 저장하는 동안 찰옥수수의 미생물변화, 호화도, 수분함량, 색도 및 물성 변화 등 건조 찰옥수수의 품질변화에 미치는 영향을 조사하였다. 총균수는 6시간 원적외선 건조 시 생옥수수인 대조구의 경우 2.32 log CFU/g을 나타내었으나 모든 처리구에서는 검출되지 않았다. 그러나 $4^{\circ}C$에서 저장시 저장 3개월까지는 대조구를 제외한 모든 처리구에서 총균수가 검출되지 않았으나 7개월 저장 후에는 대조구에 비하여 증자 찰옥수수 처리구가 약 2 log, 당처리구는 약 2.7 log 정도 감소하였다. 곰팡이 및 효모는 총균수보다 원적외선 건조에 약간 더 저항성이 강한 것으로 나타났으며 이러한 결과는 $25^{\circ}C$에서 저장시 유사한 것으로 나타났다. 생옥수수의 호화도는 저장 전에 98%, 저장 7개월 후 96.2%로 거의 변화가 없었으나 원적외선 건조한 증자 찰옥수수는 저장 전에 81.14%, $4^{\circ}C$에서 7개월 저장 후 58.73%로 많이 노화되었으며 이러한 결과는 당처리구에서도 유사하게 나타났다. 수분함량은 당처리구 찰옥수수가 증자 찰옥수수에 비하여 건조시간이 증가함에 따라 수분함량이 더욱 낮아졌으며 색도변화는 생옥수수는 건조시간이 증가함에 따라 색의 밝기(L값)가 증가하였으나 증자 또는 당처리구 찰옥수수는 9시간 건조까지는 건조시간에 따라 L값이 증가하였으며 12시간 이후부터는 현저하게 감소하였다. 경도는 건조전에 생옥수수가 증자 또는 당처리 찰옥수수에 비하여 경도가 높았으며 9시간 건조이후에는 생옥수수와 당처리 찰옥수수의 경도가 비슷하게 나타났으나 증자 찰옥수수는 현저하게 경도가 저하되었다. 본 연구결과, 찰옥수수를 원적외선 건조하여 수분함량을 낮춤으로 미생물의 생육 저하, 저장성 향상은 물론 안전성 및 고품질 확보에 도움이 될 것으로 사료된다.

• 한국식품저장유통학회지
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• 제3권2호
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• pp.137-143
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• 1996

In order to produce the high-quality of dried red pepper with respect to a color and a taste we developed a automatic drier equipped with combined several heat energies(ADCHE). and compared the quality of ADCHE-treated red pepper with that of the pepper treated with conventional dryings such as natural, hot-air, and far-infrared ray dryings. The results obtained were as follows : (1) The contents of capsanthin varied significantly with drying methods within the range of 1.7 to 6. 4mg/g dry weight. The capsanthin level of red pepper treated with far-infrared ray drying was higher than that of the pepper treated with ADCHE showed the highest at 51.46mg/g dry weight of three drying methods. (2) As a result of determination of color intensity of-red-pepper using-a colorimeter, the red color intensity of the peppers was affected by drying methods irrespective of drying temperature, and especially a value of red pepper treated with ADCHE was appeared to be 19. 1, indicated that this pepper have the most bright color intensity. (3) The contents of soluble browing subatances increased with a increase in drying temperature, but L* value of red pepper treated with ADCHE was appeared to be 0.187, indicated that this red pepper have the most clear red color (4) The changes of capsanthin level of red pepper according to drying methodes did not show significantly, but generally a decreasing rate of capsanthin levels were lower in that order ADCHE

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.937-946
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• 1996

A Far Infrared Ray (FIR) dryer was designed , constructed and tested for red pepper , lycium chinese, and mushroom (Cortiellus shiitake ) drying , and the results were compared to the heated air dryer at the same condition. In the FIR dryer, three different panel materials , galvanized, copper and stainless steel, were used and no ceramic coating and those with ceramic coating (three panels) were 58% , 56%, 64%, and 88% , respectively. The drying times of lycium chinese and mushroom were shortened in FIR dryer by 6 hrs and 4 hrs compared to the heated air drying, respectively. while to remarkable difference in the drying times was found in the red pepper drying . The quality of products was better in FIR dryer where more red color value for red pepper and lycium chinese and more brightness for mushroom . The drying performance of a FIR dryer was superior in terms of total cost of 80,800 WON /100kg of lycium chinese , reduced by 25% compared to the heated air drying.

• 한국환경과학회지
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• 제30권2호
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• pp.135-143
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• 2021

This study executed evaluation of drying characteristics based on the polymer injection rate (8%, 10% and 12%) and the drying method[NIF(near-infrared ray). According to this study analyzed VS, VS/TS, and calorific value compared with 'the auxiliary fuel standard of the thermoelectric power plant and the combined heat & power plant'. The results are as follows. In the case of NIR, the VS was slightly changed at the early stage of the material preheating period and the constant drying rate period with low moisture evaporation. But VS reduction was shown higher as moisture was dried. In the case of non-digested sludge with high VS content, the VS reduction rate by drying was shown lower than that of digested sludge. As the flocculant injection rate increased, the VS loss due th drying was found to be small. Also, the higher the flocculant injection rate was the longer the drying time. Especially, in the case of the NIR drying equipment, as the moisture content of sewage sludge decreased(moisture content 20~40%), the loss of net VS also showed a tendency to increase sharply. It is shown that the high calorific value according to the drying time of the non-digested sludge was changed from 590 kcaℓ/kg to 3,005 kcaℓ/kg and from 539 kcaℓ/kg to 2,796 kcaℓ/kg.

• 한국태양에너지학회 논문집
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• 제24권1호
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• pp.21-27
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• 2004

Near Infrared Ray (NIR) are primarily of interest to the high energy physicist. It is the intermediate portion of the spectrum, which extends from approximately 0.8 to 1.5 ${\mu}m$ and include a portion of the all of infrared, that is thermal radiation and is pertinent to heat transfer. It is important to study that temperature distribution of the drying materials by surface encompasses a range of NIR wave lengths. This study is to investigate the characteristics of NIR dryer by experimental results. it was made a comparison with various textiles, velocity ratio and distance of lamp and textiles. In case of spongy type textile the drying performance is the superior of all. The 0.15m distance drying effect of improvement 30% more than 0.26m distance between lamp and textiles. As the contained water increases, the drying speed for textile can be increased.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.183-188
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• 2009

RFID method is a non-contact automatic identification technology, which attaches microchips and antennas to an object in a tag form, to send and process information sent to the network using wireless frequency. Drying and curing process is extremely important which minimizes the resistivity of RFID antennas. This research is about the drying characteristic of conductivity ink, and analyzes and compares the hot-air drying process and infrared drying process. Also, the research was done for the improvement in drying performance by using combined process of hot-air and infrared mechanism. The experiment result shows that the hot-air or infrared drying system used alone cannot meet the required performance in drying printing method using conductivity ink. The combined drying system of hot-air and infrared ray showed resistance low enough in short drying and curing time, and this mechanism makes drying and curing process for mass and continuous production possible on-line.

• 한국식품영양과학회지
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• 제29권4호
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• pp.561-567
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• 2000

참나물을 원적외선 건조기와 원적외선-진공건조기를 사용하여 건조할 때 건조조건에 따른 건조속도, 색도, 미생물 변화, 갈변도, 수화복원성 및 관능검사 등 건조참나물의 품질변화에 미치는 영향을 조사하였다. 참나물의 건조속도는 건 조온도를 5$0^{\circ}C$, 6$0^{\circ}C$ 및 7$0^{\circ}C$로 하여 원적외선-진공건조를 하였을 때는 원적외선 건조한 경 우보다 건조시간이 약 17%이상 단축되었다. 색도변화는 건조온도가 높을수록 증가되었으며 원적외선진공건조가 원적외선보다 그 변화율이 작았다. 건조시간에 따른 참나물의 미생물변 화는 건조온도가 높을수록 그리고 건조시간이 길어질수록 감소하였으나 건조방법에는 큰 영 향을 받지 않았다. 건조방법과 건조온도에 따른 참나물의 수화복원성은 원적외선-진공건조 시료가 원적외선 건조시료보다 재수화 특성값이 높았으며, 특히 건조온도가 높을수록 복원 률이 우수하였다. 재수화 후의 관능적 품질은 낮은 온도에서 그리고 원적외선 건조 참나물 보다 원적외선-진공건조 참나물이 높은 점수를 얻었으며, 특히 관능적 색도면에서는 원적외 선 건조보다 원적외선-진공건조를 행한 경우에 훨씬 좋은 점수를 나타내었다. 따라서 원적 외선-진공건조를 사용할 경우 원적외선 단독보다는 건조 효율이 증대되며, 복원성과 색도의 안전성을 증진시킴으로써 참나물의 품질저하를 최소화할 수 있었다.

• Journal of Biosystems Engineering
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• 제25권2호
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• pp.115-122
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• 2000

This study was performed to develop a prototype continuous flow ginseng dryer with which better product quality and lower drying energy consumption could be achieved compared with conventional ginseng dryers. A dryer having both far infrared ray (IR) and heated-air as the drying energy sources was designed and fabricated . Dryer performance was studied by examining energy efficiencies and dryer performance evaluation indices (DPEI) during the drying tests of medium-sized four year ginseng roots with IR radiating plate temperature and drying air temperature in the range of 80-12$0^{\circ}C$ and 22-5$0^{\circ}C$, respectively. The DPEI of IR /heated -air combined drying was 1/3 of that of the conventional heated-air drying when ginseng were dried to the same final moisture ratio. When ginsengs were dried for 12 hours in the prototype IR/heated-air combination dryer, a linear relationship was found to exist between final moisture ratio and ginseng temperature. As the drying progressed, drying air temperature inside the dryer was nearly constant but ginseng temperature was drastically increased during the first two hours and gradually increased thereafter until the end of drying. With the prototype Ir/heated-air combination dryer, the drying rate changed little but the energy efficiency increased proportionally when the amount of ginseng to be dried increased. Drying capacity, energy efficiency, and DPEI of the prototype IR/heated-air combination ginseng dryer were estimated to 1.500 roots, 65% and 3.800kJ/kg-water , respectively.

• 한국수산과학회지
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• 제53권5호
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• pp.707-716
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• 2020

Red sea cucumber Stichopus japonicus, was dried using three methods-far-infrared ray, vacuum, and freeze drying and then enzymatically hydrolyzed using nine proteases: Alcalase, Flavourzyme, Kojizyme, Neutrase, Protamex, trypsin, α-chymotrypsin, and papain. In addition, the potential ability of hydrolysates to inhibit lipid accumulation in 3T3-L1 adipocytes was evaluated. The yield of hydrolysates from red sea cucumbers dried using each method was higher than that of the distilled water extract, and protein contents were either similar or higher. The hydrolysates that exhibited inhibitory effects on lipid accumulation, as demonstrated via Oil red O staining, were those obtained by far-infrared ray drying coupled with Alcalase, Flavourzyme, Kojizyme, or Neutrase treatment. In addition to the advantages of far-infrared drying and the characteristics of Flavourzyme, the Flavourzyme hydrolysate of far-infrared-dried red sea cucumber showed the highest inhibitory effect on lipid accumulation. In addition, this hydrolysate significantly decreased the expression of the protein factor fatty acid-binding protein 4, which is related to the late differentiation of 3T3-L1 adipocytes. Taken together, these results suggest that Flavourzyme hydrolysates from farinfrared-dried red sea cucumber may be used as a functional food and/or a pharmaceutical ingredient for the inhibition of lipid accumulation.