• Journal of Korean Academy of Nursing
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• v.41 no.1
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• pp.110-118
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• 2011

Purpose: The purpose of this study was to evaluate the effects of self-foot reflexology on stress (perceived stress, urine cortisol level, and serum cortisol level), fatigue, skin temperature and immune response in female undergraduate students. Methods: The research design was a nonequivalent control group pretest-post test design. Participants were 60 university students: 30 in the experiment group and 30 in the control group. The period of this study was from April to June 2010. The program was performed for 1 hr a session, three times a week for 6 weeks. The data were analyzed using the SPSS/WIN 17.0 program. Results: The results showed that self-foot reflexology was effective in reducing perceived stress and fatigue, and raised skin temperature in female undergraduate students. But cortisol levels and immune response were not statistically significant different. Conclusion: The results of this study indicate that self-foot reflexology is an effective nursing intervention in reducing perceived stress and fatigue and, in improving skin temperature. Therefore, it is recommended that this be used in clinical practice as an effective nursing intervention for in female undergraduate students.

• Korean Journal of Child Studies
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• v.36 no.4
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• pp.163-176
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• 2015

The purpose of this study is to examine the longitudinal causal relationships between maternal parenting stress and parenting attitudes. Relevant data from mothers with infants aged from 2 to 4 years of age was gathered from the Panel Study of Korean Children were analyzed by means of Latent Growth Modeling. The findings are as follows, First, levels of parenting stress increased whereas the extent of positive parenting attitudes decreased as children grow older. Second, the initial value of parenting stress was observed to have a negative effect on the initial value of positive parenting attitudes. Third, those mothers who generally have faster speeds of increasing parenting stress tend to have faster speeds of decreases in positive parenting attitudes. What this study clearly revealed is that the positive parenting attitudes of mothers with infants tend to improve when the mothers try to efficiently deal with their parenting stress by either acquiring appropriate parenting knowledge or receiving support from their families and communities.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.10 no.2
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• pp.163-170
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• 2016

The purpose of this study was to verify the emotional response of user to LED light colors in healing bed system in cypress tree. Eight colors of LED light were provided including red, orange, yellow, green, blue, indigo, violet and white. And three illumination color temperature were provided including 3,000K, 5,000K, 8,000K. Seven subjects in their twenties were involved without the medical history of eyes and heart disorders. The subjects were exposed to LED lighting during 5 minutes and their emotional response was evaluated through the following: first, at the physiological effect heart rate variability(HRV) was measured during the stimulation; second, at the emotion level the subjects were asked about lighting color and color temperature through a survey. Results, lower color temperature of 3,000K and green color shows high value on HRV. We have found that there is a difference of physiological and emotion level effect depending on color stimulus. This study could be applied to reference data to analysis of a decrease in fatique and charges of brain waves for color stimulus.

• Journal of Conservation Science
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• v.31 no.4
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• pp.373-386
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• 2015

This study identified degradation properties by temperature stress with Araldite$^{(R)}$ AY103-1/HY956 used for ceramics. Tensile and compressive strength of durability increased for 6,480 hours at temperature of $34{\sim}45^{\circ}C$. In stability of external stress and temperature, compressive strength is superior to tensile strength, it requires conservation plans considering strength properties and stress of restoration materials. The tensile shear strength of adhesion properties decreased for 4,320 hours at temperature of $40{\sim}60^{\circ}C$. In ceramics with porosity, environments under isothermal-isohumidity are important because interfacial properties of adherend are concerned with performance variation. Glossiness decreased for 6,480 hours at temperature of $34{\sim}45^{\circ}C$ and color difference increased. Gloss stability was superior and color stability was weak, which requires improvement of optical properties. In artifacts on display in museums, there is concern about temperature rise on restoration materials by lighting therefore, it needs to minimize change in physical properties by exposure environments.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2005.05a
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• pp.249-251
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• 2005

SA와 온도가 애기장대의 안토시아닌 생성에 미치는 영향을 조사하기 위하여 여러 농도의 SA와 다양한 온도를 처리하여 시간적 경과에 따른 안토시아닌 함량변화와 PAL 환성을 조사하였다. 10 ${\mu}$M 이하의 SA 처리구에서는 안토시아닌 함량에 있어서 큰 변화가 없었으나 100 ${\mu}$M 이상의 처리구에서는 크게 증가하였다. 25 ${\mu}$M SA처리구에서 안토시아닌 함량이 가장 높았으며 5일째에는 약 3.3배 증가하였다. 그러나 100 ${\mu}$M의 고농도 SA 처리구에서는 감소하는 경향을 나타내었다. PAL 활성은 25 ${\mu}$M SA 처리시 점차 증가하여 3일째에 가장 높은 활성을 보였다가 이후 서서히 감소하였다. 그러나 100 ${\mu}$M 이상의 SA 처리구에서는 PAL활성이 점차 감소하는 경향을 보여 주었다. 온도조건에 따라 안토시아닌 축적은 다소 차이를 보여 주었는데, 10$^{\circ}C$ 및 15$^{\circ}C$ 에서 안토시아닌 생성이 촉진되었으나, 온도가 상승함에 따라 점차 감소되어 30$^{\circ}C$의 고온에서는 현저하게 저하되었다. 따라서 본 연구결과로부터 애기장대의 안토시아닌 축적현상은 SA의 외적 처리와 온도요인에 의해 형성된 스트레스에 반응하여 유도된 것으로 추측되며 일종의 보호기능과 관련이 있음을 시사해 준다.

• Applied Chemistry for Engineering
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• v.25 no.6
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• pp.553-558
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• 2014

Microalgae are a promising alternative feedstock for biodiesel production because their growth rates and oil contents are higher than those of conventional energy crops. Microalgal lipid is mainly triacylglyceride that can be converted to biodiesel as fatty acid methyl esters through trans-esterification. In this paper, the influence of several important lipid inducing factors such as nutrient limitation and changes in salinity and metallic components in microalgae and their potential strategies to be used for biodiesel production are reviewed. Depending upon strains/species that we use, microalgae react to stresses by producing different amount of triacylglyceride and/or by altering their fatty acids composition. Although the most widely applied method is the nitrogen starvation, other potential factors, including nutrient surplus conditions and changes in salinity, pH, temperature and metal concentrations, should be considered to increase biodiesel productivity.

• Korean Journal of Plant Resources
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• v.23 no.1
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• pp.25-30
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• 2010

This study was carried out to understand the effect of low temperature($4^{\circ}C$), heat shock($37^{\circ}C$) and drought stresses on the growth and gene expression of Arabidopsis ATSIZ3(at1g08910) mutants. The seedling growth of SIZ3-mutants were markedly inhibited by the treatment of heat shock or chilling stresses. However, there was no significant differences between wild type and SIZ3-mutants in seeding fresh weight. As compared to wild type plants, SIZ3-mutants showed 63.9% inhibition of seedling fresh weight by the treatment of 10 days drought stress, suggesting that SIZ3 is involved in the resistance of Arabidopsis to drought stress. Base on RT-PCR analysis, expression of SIZ3 mRNA in the wild type showed 20% inhibition by chilling stress, 3.7 and 4.5 fold increase by the treatment of heat shock or drought stresses, respectively.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.1
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• pp.418-425
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• 2013

In this study, the three scents effects on subjects due to EEG type, and it researched to find optimal scent to increase their amenity and productivity. EEG and HRV were compared and analyzed in the environmental test room by classifying subjects into two type: A and B. The condition of the environmental test room was in temperature 31[$^{\circ}C$], relative humidity 50[RH%], air current speed 0.02[m/s] and illuminance 1000[lux] with setting up three different scents which are Rosemary, Jasmine and Hazelnut. The result of this study, at Jasmine scent for A and B type, relative ${\alpha}$ wave, SEF50, $\frac{SMR}{\theta}$ and SDNN were revitalized, and ${\alpha}$ wave asymmetry index, HRT, stress index and fatigue degree were decreased. It was found that favorite scent of A and B type is same as Jasmine scent, but A type was more sensitive than B type about scent. Therefore Jasmine scent is very effective to increase amenity, productivity and concentration, and to decrease stress and fatigue degree.

• International Journal of Highway Engineering
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• v.11 no.1
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• pp.247-256
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• 2009

This research was conducted to analyze the behavior of PTCP (Post-Tensioned prestressed Concrete Pavement) under tensioning by performing field tests when the experimental PTCP slab was being constructed. The displacements in the slab under the environmental loading and tensioning were measured using temperature measurement sensors and displacement transducers. Tensioning was performed three times and appropriateness of tensioning could be determined by investigating the relationship between temperature and displacement, behavior of transverse crack, and daily change in displacement. The results of this study showed that under the first tensioning at very early age, large displacements were observed only near the joints because of the friction between slab and underlying layer and concrete inelasticity. Under consecutive tensioning, displacements were clearly observed all over the slab, but still affected by the friction. In addition, appropriate tensioning ensured the one-slab behavior of the PTCP slab even though cracks existed.

• Korean Journal of Microbiology
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• v.54 no.4
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• pp.471-473
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• 2018

Variovorax sp. PMC12 is a rhizobacterium isolated from tomato rhizosphere and enhanced the plant resistance to abiotic and biotic stresses. Here we present the complete genome sequence of strain PMC12. The genome is comprised of two circular chromosomes harboring 5,873,297 bp and 1,141,940 bp, respectively. A total of 6,436 protein-coding genes, 9 rRNAs, 64 tRNAs, 3 ncRNAs, and 80 pseudogenes were identified. We found genes involved in 1-aminocyclopropane-1-carboxylate (ACC) deaminase, antioxidant activity, phosphate solubilization, and biosynthesis of proline and siderophore. Those genes may be related to capability of improving plant resistance to various stresses including salinity, cold temperature, and phytopathogen.