• Journal of Digital Convergence
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• v.18 no.1
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• pp.241-247
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• 2020

The effect of radiofrequency radiation (RF) exposure on mouse associated with the exercise was investigated in the brain at the molecular level. The expression of tyrosine hydroxylase(TH), FoxO3a, AMPKα and mRNA was investigated by real-time RT-PCR in striatum and the hypothalamus. In the striatum, TH mRNA expression was decreased in the exercise and RF exposure group. FoxO3a mRNA expression was significantly increased in the spontaneous exercise group and a significant decrease was observed in the RF exposure and spontaneous exercise group. In the hypothalamus, TH mRNA expression was significantly decreased in the RF exposure and spontaneous exercise group. But, FoxO3a mRNA expression was significantly increased in the RF exposure and spontaneous exercise group. We will further investigate the expression of protein molecules in the hippocampus of the brain to reveal the effects of RF radiation on memory.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 1994.07a
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• pp.15-16
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• 1994

옥수수 전분의 추출공정 개선 연구의 일환으로 메 밀 찰옥수수에 0-10 kGy범위의 감마선을 조사한 후 전분 추출시험과 추출전분의 이화학적 특성을 펴가하였다. 적정선량 범위의 감마선조사는 전분추출을 위한 침지시간을 기존 50시간에서 40시간으로 단축 시킬 수 있었으며, 환경기준 물질인 옥수수침지액(아황산용액)의 농도를 기존 0.8-1.2% 에서 0.2%로 크게 감소시킬 수 있었다. 또한 옥수수전분 추출액에 있어서 감마선 조사된 메옥수수와 찰옥수수는 비조사군에 비해 10-30% 이상의 추출율 증대효과를 나타내었다. 추 전분의 이화학적 특성시험에있어서는 두 시료 모두 감마선조사에 의해 alkaili number와 광투과도가 크게 증가 하였으며, 물 결합능력 및 swelling power는 다소 감소하는 경향이었다.전분의 색도는 조사군과 비조사군 사이에 유의적인 차이가 없었다. 효소반응 시험에서는 감마선 조사량이 증가함에 따라 효소반응 생성물인 포도당과 환원당 함량이 크게 증가하였다. Amylograph에 의한 물성시험에서는 감마선조사에 의해 전분호화액의 점도는 감소되었고, 그 경향은 메옥수수보다 찰옥수수에서 더욱 현저하였다. 또한 감마선의 이용은 옥수수 전분의 breakdown ratio 및 setback ratio를 향상시킬 수 있어 식품가공에서 전분의 고존도 사입 가능성을 시사하였다. 시사하였다.

• 한국방재학회:학술대회논문집
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• 2008.02a
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• pp.41-44
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• 2008

The purposes of this study are to estimate thestrength of concrete and quantify the deterioration of concrete by a unique X-ray technique with a contrast medium. In order to estimate the strength of concrete, specimens with different water-cement ratios were fabricated using non-air-entrained concrete, air-entrained concrete and mortar to determine the relationship between their compressive strength and the transit dose obtained by the X-ray technique. Also, an experiment to quantify deterioration was carried out on specimens that were subjected to freezing and thawing action to different levels of dynamic elastic modulus. As a result of this experiment, estimation of the strength and relative dynamic elastic modulus of deteriorated mortar, concrete and air-entrained concrete was found feasible by measuring the transit dose by the X-ray technique.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.35 no.1
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• pp.45-55
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• 2022

Because boundary confinement details proposed in the current design standards are significantly inferior in workability and production quality, it is necessary to develop boundary confinement details of RC structural walls that are capable of ensuring seismic performance and workability. With the recent development of the wire rod manufacturing technology, various pre-fabricated continuous hoop details can be manufactured. In this study, an analysis was conducted on the moment-curvature relationship of RC structural walls to which the pre-fabricated continuous hoop details were applied. According to the nonlinear cross-section analysis, the RC structure wall to which the details of the pre-fabricated continuous hoop details are applied can ensure seismic performance as the area of the pre-fabricated continuous hoop increases. Based on these research results, when applying the pre-fabricated continuous hoop in detail, it is necessary to secure the area of the pre-fabricated continuous hoop as much as the area of the existing boundary confinement.

• Nuclear Medicine and Molecular Imaging
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• v.43 no.2
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• pp.100-106
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• 2009

Purpose: The study was to assess I-123-N-(3-iodopropen-2-yl)-2[beta]-carbomethoxy-3[beta]-(4-cholorophenyl) tropane(IPT) SPECT in differential diagnosis among early stage of Parkinson's disease(PD) and essential tremor(ET) and normal control(NL) groups quantitatively. Materials and Methods: I-123 IPT brain SPECT of 50 NL, 20 early PD, 30 advanced PD, and 20 ET were performed at 20 minutes and 2 hours. Specific/nonspecific binding of striatum was calculated by using right and left striatal specific to occipital non-specific uptake ratio(striatum-OCC/OCC). Results: Mean value of specific/nonspecific binding ratio was significantly different between advanced PD group and NL group. However, significant overlap of striatal specific/nonspecific binding ratio was observed between PD group and ET group. Bilateral striatal specific/nonspecific binding ratios were decreased in advanced PD. Lateralized differences in the striatal uptake of I-123 IPT correlated with asymmetry in clinical findings in PD group. Conclusion: I-123 IPT SPECT may be a useful method for the diagnosis of PD and objective evaluation of progress of clinical stages. Care should be made in the differential diagnosis of early stage of PD and other motor disturbances mimicking PD such as ET in view of significant overlap in striatal I-123 specific/nonspecific binding ratio.

• The Journal of the Korean dental association
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• v.1 no.1
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• pp.128-129
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• 1954

• 대한방사선치료학회:학술대회논문집
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• 2004.03a
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• pp.9-9
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• 2004

• The Science & Technology
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• v.9 no.8 s.87
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• pp.51-52
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• 1976

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1990.10a
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• pp.156-158
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• 1990

• Radioisotope journal
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• v.11 no.3
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• pp.48-51
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• 1996