• 대한한방부인과학회지
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• 제24권3호
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• pp.146-155
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• 2011

Objectives: Since early developed measurement of Postpartum depression(PPD) doesn't reflect physical symptoms, we need to find out how PPD and related physical disorders are expressed in functional medical methods. The study was conducted to find out characteristics of 7 Zone diagnosis and postpartum physical symptoms on PPD. Methods: To 216 postpartum women who did normal delivery, we measured 7-zone-diagnosis Factor AA's height on 5th day and 15th day postpartum. And we surveyed EPDS and postpartum physical symptoms question on 15th day postpartum. Subjects were divided into normal and depression group by EPDS score. And we compared Factor AA's height between two groups and Factor AA's height change in each group. Results: In depression group, Factor AA's height was higher than normal group on 5th day and 15th day postpartum. In both groups Factor AA's height was decreased on 15th day compared to 5th day postpartum. In normal group 2, 6, 7 zone were significantly decreased and in depression group only 6 zone was significantly decreased. Conclusions: These results demonstrate that postpartum depression group has low recuperative power. And these can be judged by Factor AA's height change.

• Journal of Mechanical Science and Technology
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• 제18권6호
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• pp.955-960
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• 2004

Some characteristics of the eigenvalue sensitivities have been found for beams in the paper. For cantilever beams and simply supported beams, the sensitivities of the eigenvalues to the stiffness correction factor of one element are equal and opposite to the sensitivities to the mass correction factor of the symmetrically positioned element. For beams with other boundary conditions, however, the relationship does not hold. The relationship has been proven analytically for simply supported beams.

• 가족자원경영과 정책
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• 제21권2호
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• pp.95-117
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• 2017

The purpose of this study was to examine the level of anxiety about economic change in middle-aged and elderly people and to analyze the factors that influence this anxiety. The data, derived from Korean General Social Survey(KGSS) were collected from Survey Research Center of Sung Kyun Kwan University. The samples included 821 people over the age of 40, including 529 middle-aged people who were from 40 to 59, and elderly people who were over 60. Multiple regression analysis was used to analyze the research model. The findings from the analysis showed that age and subjective economic status had crucial effects on the entire group's anxiety about unemployment and poverty, housing prices, financial markets, and economic recession in the older life. For the middle-aged group, age in particular had crucial effects on all the components of its anxiety about economic change. For the elderly group, geographical region was the most critical factor that affected its anxiety about economic change, the elderly people who were living in metropolitan area and towns had more anxiety than those who were living in rural areas. In particular, region was the only factor that affected the elderly group's anxiety about financial markets, and economic recession. These results showed that specific age of middle-aged and elderly people had the crucial effects while their sex, educational level, and the employment status of their spouse had no effects on their anxiety about economic change. Objective economic indices such as their earned-income and other income including savings and pensions had no effects on their anxiety level. While as noted above subjective economic indices such as their standard of living compared with their parents, projected economic status, and level of socio-economic success had an effect on anxiety about economic change.

• 한국기후변화학회지
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• 제8권4호
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• pp.347-355
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• 2017

Methane and nitrous oxide are main greenhouse gases from agricultural system and their global warming potential are 25 and 258 times stronger than that of $CO_2$, respectively. In 2016, the emission was $21,290Gg\;tone\;CO_2-eq$. which was emitted from agriculture sector and about 3.1% of total GHG emission of Korea. Those guidelines that were published by IPCC have methodology for GHGs emission calculation as well as emission factor and so on. For recent 5 years, GHGs emissions in Korea have calculated by MRV which has been improved every year based on IPCC guidelines. Analysis as estimating method improvement showed that the methane emissions from rice cultivation were the lowest on 2012 methodology, and the highest on 2014 methodology. On the other hand, the emissions of agricultural soils were the lowest on 2015 methodology and the highest on 2012 methodology. Total emissions from agriculture sector were the lowest on 2015 methodology and the highest on 2012 methodology. Compared with 2016 methodology, the GHGs emitted as few as $-1,865Gg\;tone\;CO_2-eq$ and as many as $2,717Gg\;tone\;CO_2-eq$. GHGs emissions can vary greatly, depending on how to use the emission factor and activity data. Therefore, it need constantly a detailed analysis for methodology and GHGs emission in the future.

• 한국의학물리학회지:의학물리
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• 제11권1호
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• pp.1-18
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• 2000

쐬기인자의 조사면에 따른 변화는 여러 저자들에 의해 보고되었으나, 아직도 정량적인 설명이 이루어지지않고 있다 따라서 본 연구에서는 4 cm $\times$ 4 cm에서부터 25 cm $\times$ 25 cm까지의 조사면에 대해서 10 cm $\times$ 10 cm 기준 조사면에 대한 상대적 쐬기인자를 조사하였다. 조사면의 증가에 따라 쐬기를 통과하는 고에너지 광자선의 선속변화로 인해 쐬기인자는 6MV 광자선에서 최고 8.0%까지 증가하였다. 이러한 증가는 조사면이 10 cm보다 작은 경우를 제외하고는 일반적으로 알려진 바와 같이 광자선이 통과하는 쐬기의 부피와 선형적인 관계를 갖고 있음이 박혀졌다. 그러나 특히 쐬기의 경사면에 평행한 방향으로의 조사면이 증가하는 좁은 조사면의 경우에서는 쐬기의 두께변화로 인해 야기되는 광자선의 선속변화가 상대적으로 작아짐에 따라 10-15 cm까지는 약간의 감소가 나타나고 있다 따라서, 광자선의 중심축의 선량에 기여하는 주광자선의 선속변화로 인해 쐬기인자의 변화원인을 설명할 수 있으며, 그 관자선의 선속변화는 쐬기의 경사방향에 대한 조사면의 크기변화에 영향을 받고 있음을 알 수 있다. 기존에 제안되어진 쐬기인자의 변환 식을 본 연구결과에 잘 맞도록 보정하여 제시하였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.33-37
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• 1995

A side-cut grinding generates a machining error by the decrease of the quill rigidity. In this paper, The effect on the grinding force, machining error and surface roughness due to the change of the quill rigidity is investigated experimentally. The slenderness ratio of the quill is a significant factor to analyse the change of the grinding force and machining error.

• Journal of the Korean Data and Information Science Society
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• 제18권2호
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• pp.289-300
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• 2007

The stock return is changed by factors of inside and outside or is changed by factor of market system. But most studies have not considered the changes of stock return distribution when estimate the VaR. Such study may lead us to wrong conclusion. In this paper we calculate the VaR of price-to-earnings ratios by the distribution that have considered the change point and used transformation to satisfy normal distribution.

• The Journal of the Acoustical Society of Korea
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• 제18권4E호
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• pp.10-19
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• 1999

Psychophysical approaches to the room acoustics have been made in number of researches. The present study is looking at whether the listener's perception of frequency change in rooms are dependent on the acoustics of a listening environment. P(C)s for frequency change in short tones were measured in different listening conditions. Two experiments were carried out to investigate the influence of room acoustics on the listener's perception of frequency change, and its implication for evaluating the acoustics of listening environments were examined and discussed. It was found that the temporal and spectral contents of reflections from room surfaces might be an important factor which influenced the listener's perception of frequency change in a reverberant sound field. This implicates that psychophysical approach by measuring listener's frequency change perception might be an useful tool for evaluating room acoustics. However, cares should be taken, since some individual differences were found to exist with respect to the direction of frequency change.

• Water Engineering Research
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• 제4권1호
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• pp.31-43
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• 2003

The impacts of climate change on soil moisture in sub - Arctic watershed simulated by using the hydrologic model. A range of arbitrary changes in temperature and precipitation are applied to the runoff model to study the sensitivity of soil moisture due to potential changes in precipitation and temperature. The sensitivity analysis indicates that changes in precipitation are always amplified in soil moisture with the amplification factor for flow. The change in precipitation has effect on the soil moisture in the catchment. The percentage change in soil moisture levels can be greater than the percentage change in precipitation. Compared to precipitation, temperature increases or decreases alone have impacts on the soil moisture. These results show the potential for climate change to bring about soil moisture that may require a significant planning response. They are also indicative of the fact that hydrological impacts affecting water supply may be important in consider-ing the cost and benefits of potential climate change.

• 한국기후변화학회지
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• 제7권4호
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• pp.513-520
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• 2016

Korea's energy consumption has been constantly increasing. Final energy consumption was increased by an annual average of 2.9% compared to 2010. The consumption of all energy sources except for its oil was increased during the same time. While electric demand has increased coal consumption increased rapidly. Therefore, calorfic value and carbon emission factor development can improve the quality of Korea's greenhouse gas inventory. Calorific value is the amount of heat generated while burning coal. Caloric value is one of the most important factors in the development of carbon emission factors. Calorific value is used as the basis for the analysis of the various energy statistics. This study has calculated the other bituminous coal and coking coal's calorfic value by the data received from domestic coal-fired power plants and steel manufacturer. Calorofic value's trend analysis period is the year of 2010~2014. Through analyzing the carbon content it was calculated the carbon emission factor. The bituminous coal and coking coal's uncertainty analysis was performed using a Monte Carlo simulation.