• Korean Chemical Engineering Research
• /
• v.50 no.6
• /
• pp.1049-1055
• /
• 2012

The fiber mat catalytic burner that uses infrared radiative heat obtained by flameless catalytic combustion was manufactured and tested to investigate its combustion characteristics. About 9 to 17% of combustion heat was released by sensible heat during the premixed catalytic combustion depend on combustion condition. To find out radiation intensity with distance between catalytic burner and sample, the equation that calculate the receiving surface of radiative energy under the fiber mat catalytic burner was driven. This equation was well correlated with the drying rate of melamine. The drying experiments were carried out to the melamine, wood chip and agricultural pallet by using the fiber mat catalytic burner and the energy efficiency was calculated from drying rate of them. The energy efficiency of the fiber mat catalytic burner reaches to 79% in maximum for drying of the wood chip.

• Industry Promotion Research
• /
• v.5 no.2
• /
• pp.1-7
• /
• 2020

This study is a technology related to a lighting lamp that illuminates indoor or outdoor lighting with light. In more detail, a see-through window is created in all directions on a case constituting the exterior, and a jade stone processed in a thin panel form is attached to the see-through window. By constructing a lighting lamp, since the soft light is irradiated indoors or outdoors through the jade stone, it provides comfort and warmth to the user, enhances the indoor or outdoor interior effect, emits far-infrared rays and negative ions, and emits a subtle floral scent It is a technology for lighting lamps using jade stones that emit. The characteristics of the product of this research and development is that the viewing window is formed in all directions on the case constituting the exterior, and the lighting lamp is composed by attaching the processed jade stone in the form of a thin panel to the viewing window. It is meaningful that they studied lightings using jade stones that generate sounds such as Buddhist scriptures, the Bible, and Sijo.

• The Magazine of the IEIE
• /
• v.30 no.5
• /
• pp.499-508
• /
• 2003

실제 실험에 사용한 대표적인 InAs/GaAs QUDIP에 대해서 detector를 평가하는데 사용하는 responsitity D*뿐만 아니라 이두 값을 좌우하는 phottoconductive gain 양자효율 noise current에 대해 정량적으로 살펴보고 QWIP와 비교해보았다 우선 가장 중요한 것은 QDIP의 온도가 약 10K에서 거의 200K까지 올라가도 responsivity와 D* 모두 온도에 따라 민감하게감소하지 않는다는 사실이다(거의 10배 정도만 감소했음). 이러한 측정결과는 QDIP의 가장 큰 장점인 실온 동작 가능성이 아주 높음을 확인시켜 준다. 참고로, 이미 사용되고 있는 QWIP나 MCT detector는 낮은 온도 영역에서도 온도가 증가함에 따라 responsivity와 D*가 민감하게 감소해서 77K 이상에서는 동작하지 않는다. 두번째로, QWIP는 시료의 표면에 수직 입사되는 IR에 반응하지 않는데, QDIP는 시료의 표면에 수직 입사되는 IR에도 잘 반응함을 확인하였다. 이러한 두 가지 특성은 QDIP가 가질 것이라고 예상되던 QDIP의 가장 큰 장점으로, QDIP가 mid IR이나 far IR detector로서의 전망이 아주 밝음을 보여준다. 저온에서 QDIP의 responsivity는 수 A/W 로, 보통의 QWIP의 responsivity가 수십 mA/W인 것을 고려할 때, 충분히 큰 값이었다. QDIP의 responsivity가 이렇게 큰 이유는 photo-conductive gain이 1000 이상으로 매우 컸기 때문이었다. 반면에, 양자효율은 0.01% 이하로 아주 작았는데, 이것은 흡수 계수 자체보다는 흡수 두께가 작기 때문인 것 같고, 따라서 QDIP의 주기 수를 늘릴 필요가 있음을 알았다. Detector를 평가하는데 가장 중요한 것은 responsivity보다는 D*인데, photoconductive gain과 양자효율의 곱에 비례하는 responsivity는 $\sim$A/W로 충분히 컸지만, 반면에 D*는 $\sim$2E8으로 QWIP에 비해 작았다. 이것은 noise current가 컸기 때문이며 이를 줄이는 것이 중요하다. Noise current의 주된 요인이 dark current에 비례하는 g-r noise이므로, dark current를 줄이는 구조가 필요하다. 대표적인 예가 AlGaAs 같은 additional barrier를 넣어 dark current를 줄이는 방법이다. QDIP의 주기 수를 늘리는 것도 dark current를 줄이는 데 도움이 될 것이다.

• Fashion & Textile Research Journal
• /
• v.17 no.6
• /
• pp.1004-1012
• /
• 2015

The purpose of this study is to investigate the loess dyeability of soybean fabric using loess as colorants. Recent days, various textile products such as inner wears, sheets and interior goods are manufactured using materials dyed with loess emphasizing its improved metabolism, anti-bacterial, deodorizing properties, and far infrared ray emissions. Soybean fabric was dyed with loess solution according to concentration of loess, dyeing temperature and dyeing time. To improve washing fastness, soybean fabric and dyed soybean fabric with loess were mordanted by mordanting agents such as sodium chloride(NaCl), Acetic acid(CH₃COOH) and Aluminium Potassium Sulfate(AlK(SO₄)₂·12H₂O). Dyeability and color characteristics of dyed soybean fabric were obtained by CCM observation. Particle size distribution of loess, the dyeability(K/S) of soybean fabric, morphology and washing durability of loess dyed soybean fabric were investigated. The results obtained were as follows; Mean average diameter of loess was 1.08µm. The main components of loess used in this study were silicon dioxide(SiO₂), aluminium oxide(Al₂O₃), and iron oxide(Fe₂O₃). The content of these three component was above 75 weight %. The dyeability of soybean fabric was increased gradually with increasing concentration of loess. The optimum dyeing temperature and dyeing time were 90℃ and 60minutes expectively. The fastness to washing according to concentration of loess and mordanting method indicated good grade result as more than 4 degree in all conditions.

• The Research Journal of the Costume Culture
• /
• v.14 no.2
• /
• pp.260-270
• /
• 2006

In this research, the curly dock was used in the process of dyeing for fabrics of the inner wear & the patient wear. Since the curly dock has a pharmacological effect on dermatosis, this study focused on the variety of color and functions of the inner wear fabrics & patient wear fabrics to make the best use of the pharmacological effect of curly dock. With regards to giving a variety of colors and functions in the inner wear, patient wear fabrics, the curly dock dye was used in each treatment conditions on the cotton & silk fabrics. After dyeing, the dyeability, color change, light fastness, washing fastness, perspiration fastness, antibiosis, far infrared emissivity and emission power were evaluated. The evaluation results are as follows; The dyeablity increased from repeated dyeing and, by using the mordant, variety of colors such as skin, mustard, greyish-brown and dark earth colors were conformed to the naked eye. Fe mordant was better than Al on the lightfastness and the washing fastness. The repeated dyeing was found out to have less effect on neither lightfastness nor washing fastness. Both silk and cotton fabrics were graded $3{\sim}4$, since their degree of degradation appeared to be the same in alkali perspiration and acidic perspiration. In the case of silk fabrics mordanted by Al, the rate of declining in both Staphylococcus aureus ATCC 6538 and Klebsiella pneumonia ATCC 4352 were 99.9%. In addition, the antibiosis was enhanced when the mordant was used. The far infrared was 86.6% of emissivity, $3.34{\times}10^2\;W/m^2{\cdot}{\mu}m$ emission power.

• Journal of Society of Preventive Korean Medicine
• /
• v.9 no.2
• /
• pp.93-106
• /
• 2005

A survey was performed for 2 weeks in October 2004 in order to examine the effects and changes of far infrared and anion of office workers aged 40 and older before and after wearing the underwear. In the survey, questionnaires and photoplethysmography were used to measure the difference between the two tests conducted with one week interval. The findings could be summed up as follows: 1. There was no statistically significant difference in changes of vascular aging points and photoplethysmogram wave form before and after wearing the far infrared and anion underwear but the points showed the increasing tendency(p>0.05). 2. A statistically significant difference was confirmed since the total points of each item in the questionnaires increased after wearing the underwear(p<0.001). 3. In connection with the systemic symptoms, a significant difference was found with increased points in all items except for no. 6 after wearing the underwear(p<0.05). 4. With regard to the difference before and after wearing the underwear depending on the Kidney symptoms, there was a significant difference with increased points in all items except for item no. 1 after wearing the underwear(p<0.05). In conclusion, to put on the underwear with effect of far infrared and anion is believed to smooth metabolism and blood circulation, contributing by thus to promoting health and preventing disease. Further studies with wider sampling of subjects are requested to diversify and refine the findings from this sectional study.

• Korean Journal of Veterinary Research
• /
• v.41 no.1
• /
• pp.37-42
• /
• 2001

This research was conducted to investigate the effects of far infrared radiological materials on growth performance, immune response and changes of microbial flora in feces for growing pigs. Twelve growing pigs($Duroc{\times}Yorkshire{\times}Landrace$, average initial body weight of $15.6{\pm}0.5kg$) were used in a 40 day growth assay. Treatments were control(saline injection with diet: S); saline injection with Bio-Plus in diet(SBP); and vaccination with Bio-Plus in diet(VBP) in a randomized complete block design with initial BW as the blocking criterion. Serum concentrations of IgG of SBP and VBP were higher than those of S at day 10(p<0.05), 20(p<0.05), 30(p<0.05) and 40(p<0.05). Pigs fed with treatment diets had increased lymphocyte level compared to S at day 20(p<0.05) and 40(p<0.05). Cortisol was lower in treatments than in S at day 30(p<0.05). At day 20, there was no significant difference in E. coli among the treatments. However, it was observed that E, coli of the treatments was decreased compared to S at day 40(p<0.01). Lactobacillus of SBP was significantly higher(p<0.05) than that of S at day 40. In conclusion, the results of the experiment suggest that far infrared radiological materials could be a very beneficial immune response for growing pigs in health aspects.

• Journal of the Korean Society of Industry Convergence
• /
• v.8 no.1
• /
• pp.47-55
• /
• 2005

Infrared heating has been traditionally used in industrial applications for processes such as dehydration of food industrial. This heating method involves the application of radiation in the wavelength range of 2 to 50 micrometers. In this work, simultaneous heat balance equations were developed to simulate the infrared radiation heating of agricultural products. The equations assume that moisture diffuses to the outer boundaries of the material in liquid form and evaporation occurs at the surface of the agricultural products. Energy for moisture evaporation is supplied by the infrared radiant energy. The optimum temperature and drying time for the best drying conditions of changing the red peppers with the moisture content of 18% and the restore rate of 80~85% are $80^{\circ}C$ and 44 hours. The performance of radiation tubes coating with the radiation paint developed in this research has the energy of $2.27{\times}103W/m^2{\mu}m$, $150^{\circ}C$ within the scope of radiation wave length of $2{\sim}30{\mu}m$ and has the radiation 0.92~0.93, which is superior to the general radiation tubes. The extinction coefficient according to the band pass filter using the 4 flux theory ha higher dependability on wave length, accounting for $2{\sim}17{\mu}m$ and $5{\times}105{\sim}106m-1$. A comparison between the theoretical energy transfer whose figures are interpreted according to 4 flux theory and the experimental energy transfer of far infrared dryer leads to the findings of the agreement less than 5%.

• Applied Biological Chemistry
• /
• v.49 no.4
• /
• pp.334-338
• /
• 2006

A repeated silica Rel column chromatography of n-BuOH fraction from the larva of Allomirina dichotoma afforded a purified nucleic acid, which was identified as inosine on the basis of the spectroscopic data including IR, MS and NMR. The HPLC analysis of the index component using silica based $NH_2$-column exhibited the contents in the hot air-dried and Far-IR-dried larvae of Allomirina dichotoma as 0.003% and 0.055%, respectively.

• Journal of the Korean Wood Science and Technology
• /
• v.34 no.1
• /
• pp.40-51
• /
• 2006

The objective of this research is to analyze a possibility for the utilization of carbonized bark and develop the technique for carbonization of bark for using as the adsorbent, the soil improvement agent, the carrier for microbial activity, health products, and so on. The properties of bark charcoals such as methylenehlue adsorption (MBA), equilibrium moisture content (EMC), far infra rad emissivity, pH, water retention and caloric value were analyzed. The MBA values of bark charcoals carbonized for 8 hr of carbonization time at $800^{\circ}C$ of carbonization temperature for Larix leptolepis, Pinus koraiensis, Pinus rigida were greater than 110 mg/g. The bark charcoals pH values of all three species that were carbonized for 4 hr of carbonization time at $400^{\circ}C$ of carbonization temperature was 6.6 and carbonized for 4 hr at 600 and $800^{\circ}C$ was about 9. Therefore the bark charcoals of those species could be used as charcoals if the carbonization temperature and time were controlled.