• Journal of Biosystems Engineering
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• v.32 no.1 s.120
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• pp.6-12
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• 2007

This study was conducted to investigate the drying characteristics of oak mushroom using stationary far-infrared dryer. Drying characteristics was measured at drying air velocity 0.4 to 0.6 m/s and drying temperature 50, 60, and 70$^{\circ}C$, respectively. With high temperature of far-infrared heater and fast air velocity, the far-infrared drying rate of double air flow system was better than conventional heated-air drying as much as 39%. The value of color difference (E) of oak mushroom before and after drying was 8.95 by using heated air drying and was in the range of 3.76$\sim$6.98 by the far-infrared drying. The shrinkage rate of oak mushroom after heated air drying was higher than that of air velocity, 0.6 m/s of far-infrared drying conditions, and was lower than that of air velocity, 0.4 m/s of far-infrared drying conditions. The content of free amino acid was higher in far-infrared drying than heated air drying.

• Journal of the Mineralogical Society of Korea
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• v.12 no.2
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• pp.96-100
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• 1999

Effects of surface conditions (temperature and roughness) of test specimens, when measuring emissive power of far-infrared ray, have been investigated using FT-IR spectrometer. Element metal zinc (Zn) was selected in this study as representative specimen of materials consisting of simple element. The zinc specimens were heated to four temperatures, i.e., 333K, 353K, .373K, and also their surface was finished with SiC abrasive papers of 100, 220, 360, 400, 600, 800, and 1000 mesh in size. The results shows that the emissive power (W/㎡) of the far-infrared ray increases with temperature for a given roughness and its relationship may be expressed by the following equations: Yη=1.0=0.142$.$T-0.937 for η=1.0, and Yη=10=0.016$.$T-1.286 for η=10. The emissive power is also known to increase with surface roughness for a given temperature. Their relationship can be represented by the following equations: YT=313K=0.234$.$$\ell$n(η)+3.53, at 313K, YT=353K=0.234$.$$\ell$n(η)+4.02 at 353K and YT=393K=0.243$.$$\ell$n(η)+4.62 at 393K.

• Journal of Korean Medicine for Obesity Research
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• v.12 no.1
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• pp.20-32
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• 2012

Object The purpose of this study is to evaluate the effect of far-infrared (FIR) therapy on weight loss. Method Thirty five participants (BMI ${\geq}25kg/m^2$) were recruited. Body weight, Waist circumference (WC), Bio Impedance Analysis (BIA), abdominal fat Computer Tomography (CT) scanning were evaluated. Results of 25 women were analyzed. Result After 6 weeks of FIR therapy, there was significant efficacy on obese women in body weight, WC, Body fat mass (BFM), and Visceral fat area (VFA). But there was no efficacy in Total fat area (TFA), and Subcutaneous fat area (SFA). Conclusion This study suggests that FIR therapy might be an effective way to promote weight and abdominal visceral fat loss in Korean obese women.

• Korean Journal of Optics and Photonics
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• v.24 no.4
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• pp.189-195
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• 2013

An F/1.2 infrared optical system that involves two aspheric BD-2 lenses and an aspheric diffractive surface was designed over $8-14{\mu}m$ with a field angle of $15.2^{\circ}$. The system may be used in uncooled cameras and is analyzed using beam synthesis propagation (BSP). The diffractive surface is modeled as a physical surface with a given thickness, and results are compared with those obtained by conventional methods, such as the exit-pupil method and a method which superposes diffraction orders.

• Publications of The Korean Astronomical Society
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• v.21 no.2
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• pp.27-33
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• 2006

Infrared color-color diagram of 10 giant molecular clouds are examined to explore the dust property from the COBE Diffuse Infrared Background Experiment of the 100, 140, and $240{\mu}m$ emission. Four of them, Taurus, Mon OB1, Gem OB1, and Chameleon, show the anti-correlation in $R_{100/140}-R_{140/240}$ plot and the horizontal distribution in $R_{100/240}-R_{140/240}$ plot, which disagree with those of theoretical calculation. These could be explained by the depletion of $100{\mu}m$ and the excess of $140{\mu}m$ emission, though no existing dust model could support them. Mean color temperature of the anti-correlation region appears to be lower than that of the linear region, whose temperatures are 15.3, 17.0 K, respectively. And the linear region shows large dispersion in the plot of intensity relation. Both imply that a star formation would be more active, but not homogeneous, in the linear region compared to the anti-correlation region.

• Journal of the Korea Institute of Military Science and Technology
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• v.19 no.2
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• pp.185-194
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• 2016

It is essential for generating the synthetic image to test and evaluate a guided missile system in the hardware-in-the-loop simulation. In order to make the evaluation results to be more reliable, the extent of fidelity and rendering performance of the synthetic image cannot be left ignored. There are numerous challenges to simulate the LWIR sensor signature of sea surface depending on the incident angle, especially in the maritime environment. In this paper, we investigate the key factors in determining the apparent temperature of sea surface and propose the approximate formula consisting of optical characteristics of sea surface and sky radiance. We find that the greater the incident angle increases, the larger the reflectivity of sea surface, and the greater the water vapor concentration in atmosphere increases, the larger the amount of sky radiance. On the basis of this information, we generate the virtual maritime environment in LWIR region using the SE-WORKBENCH, physically based rendering software. The margin of error is under seven percentage points.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2792-2794
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• 2003

In this paper, we measure the tympanic temperature and axillary temperature after far-infrared radiation. The subjects consist of 20 peoples($20s{\sim}60s$) regardless of age or sex. First of all, the subjects lied in mat without the hyperthermia induced by FIR(Far-infrared radiation) for 5 minutes(relaxation) and then lied in mat with the hyperthermia induced by FIR($40{\sim}65^{\circ}C$) for 30 minutes. At this all process, the tympanic temperature and axillary temperature were measured at every 5 minutes. Before FIR was radiating on the human body, the tympanic temperature were $1.05^{\circ}C$ higher than axillary temperature. But after FIR, axillary temperature were $0.217^{\circ}C$ higher than tympanic temperature and the difference of two parameters was decreased.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.42 no.2
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• pp.141-145
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• 1997

The long wave infrared which is ranged to 4～1, 000 ${\mu}{\textrm}{m}$ is a kind of electromagnetic wave, and the wave is being absorbed by higher plant easily. The absorbed wave in the plant promotes the metabolism of plant cell by way of resonance with the water molecules of plant cell. This experiment was carried out to determine the effect of long wave infrared radiation ceramic on growth of rice seedling, and to make the optimum mixture rate of ceramic powder when ceramics was mixed with bed soil at 4, 8, 12, 16％ levels for machine transplanting. The results of this study indicate that the growth of the seedling significantly higher in the treatment sites than that of control sites. However, there was no significant differences in dry matter weight between the treatment and control sites. At the 9.6％ mixing ratio, the highest growth of rice seedling was found.

• Journal of Biosystems Engineering
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• v.27 no.1
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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.

• The Journal of Korean Physical Therapy
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• v.14 no.2
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• pp.51-64
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• 2002

Spasticity is the most troublesome problems in the management in cerebral palsy. The purpose of this study was to observe the effect of the FES and FIR to spasticity.8 cerebral palsy children were selected for this study. Assessment was carried out before treatment for obtain baseline measurement of spasticity and reassessment were carried out at after 10, 20 treatment sessions and 24hours after treatment. The results of this study were as fellowing : 1. MAS scores were significantly reduced after 10th and 20th after treatment compared with pre-treatment. 2. MAS scores were significantly reduced after 20th and maintained 24hours after treatment compared with pre-treatment These results indicated that FES and Far infrared appears to reduce significantly MAS scores and maintained 24hours after treatment compared with pre-treatment.