• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(III)
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• pp.383-388
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• 2003

This study investigates the change of the temperature and mechanical properties of the braking disk for the railway vehicle. The average temperature is measured about $100^{\circ}C$ and the maximum temperature is measured over $200^{\circ}C$ by non-contact sensor from Seoul to Chunan. In the $20^{\circ}C-300^{\circ}C$, the $0.2\%$ offset yield strengths of the disk (GC25-30 material) are a little down to the reference value, but the linear relation of tensile test result is not find from the linear change of temperature. However, $J_{IC}$ values have the inverse proportion to the temperature, and the $J_{IC}$ value at $200^{\circ}C$ decrease $30.55\%$ from the $J_{IC}$. value of the room temperature. This result means that the crack length on the braking disk is rapidly increase at $200^{\circ}C$

• 동력기계공학회지
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• 제10권4호
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• pp.181-186
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• 2006

In this paper, a noncontact type torque meter using silicone rubber to measure the exact torque value and reduce a vibration and a noise, was developed. When planetary gear speed reducer runs, torque, RPM etc.. of motor change according to load or speed change. So, it needs a device to detect load's change or to diagnose the state of thewhole drive department by monitoring these result values. The noncontact type torque meter using silicone rubber that we're trying to develop this time is low-cost and can measure RPM and torque value simply. Also, it caculate a power using this value and indicate them on screen.

• 천문학회지
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• 제52권2호
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• pp.41-47
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• 2019

We report on the timing properties of the 'Crab twin' pulsar PSR B0540-69 measured with X-ray data taken with the Swift telescope over a period of 1100 days. The braking index of the pulsar was estimated to be $n=0.03{\pm}0.013$ in a previous study performed in 2015 with 500-day Swift data. This small value of n is unusual for pulsars, and a comparison with an old estimate of $n{\approx}2.1$ for the same target determined ~10 years earlier suggests a dramatic change in the braking index. To confirm the small value and therefore the large change of n, we used 1100-day Swift observations including the data used in the earlier determination of n = 0.03. In this study we find that the braking index of PSR B0540-69 is $n=0.163{\pm}0.001$, somewhat larger than 0.03. Since the measured value of n is still much smaller than 2.1, we can confirm the dramatic change in the braking index for this pulsar.

• 복식
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• 제53권8호
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• pp.53-63
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• 2003

Under the social conditions that an understanding of a men change socially and men's interests in their appearances are on the increase, this research intends to study and analyze the changes of people's sensibility of values on ads for men's cosmetics, which is said to be performed the social, cultural function reflecting the social consciousness, the value and the idea creating a new one. The documents for the research was sindonga. The documents were analyzed quantitatively in regard of contents of a linguistic expression and a visual expression showing on advertisements for man's cosmetics, a time series analysis. As a result of analyzing the consumption value through headline of an ad, the emotional value took the highest percentage extending whole periods. Beside emotional value, a time series analysis showed that social values appeared to the major themes in the 1970s, and functional values was important themes in 1980s, and the social values and functional values appeared equally during 1990-2002.

• 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.

• 한국기후변화학회지
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• 제8권2호
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• pp.145-151
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• 2017

Korea's energy consumption has been constantly increasing. Final energy consumption was increased by anannual 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 sub-bituminous coal's calorfic value by the data received from domestic coal-fired power plants. Calorofic value's trend analysis period is the year of 2011~2015. Through analyzing the carbon content it was calculated the carbon emission factor. The sub-bituminous coal's uncertainty analysis was performed using a Monte Carlo simulation.

• 수산경영론집
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• 제45권2호
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• pp.29-38
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• 2014

This study is to analyse the timing of the structural change of price volatility and the asymmetry of price volatility during the period before and after the timing of the structural change of price volatility using Jeju Farming Olive Flounder's production area market price data from January 1, 2007 to June 30, 2013. The analysis methods of Quandt-Andrews break point test and Threshold GARCH model are employed. The empirical results of this study are summarized as follows: First, the result of Quandt-Andrews break point test shows that a single structural change in price volatility occurred on May 4, 2010 over the sample period. Second, during the period before structural change, daily price change rate has averagely positive value which means price increase, but during the period after structural change daily price change rate has averagely negative value which means price decrease. Also, daily volatility of price change rate during the period before structural change is higher than during the period after structural change. This indicates that price volatility decreases after structural change. Third, the estimation results of Threshold GARCH Model show that the volatility response against price increase is larger during the period after structural change than during the period before structural change. Also the result shows the volatility response against price decrease is larger during the period after structural change than during the period before structural change. And, irrespective of the timing of structural change, price increase has an larger effect on volatility than price decrease. This means volatility is asymmetric at price increase.

• 보험의학회지
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• 제2권1호
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• pp.101-115
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• 1985

In Med Dept. Daehan Education Insurance, Total 690 cases(male 376 cases, female 314 cases) were inspected to study the change of serum lipid value. The objects of investigation were total cholesterol, HDL cholesterol, triglyceride, phospholipid and total lipid value. The results are as follows: 1) In the normal subjects, with the relation of serum lipid value and the age. triglyceride, phospholipid and total lipid value showed the increasing tendency by 70 age, but total cholesterol value and HDL cholesterol value showed the increasing tendency by 59 age and the decreasing tendency after 59 age. 2) In the normal subject the difference of serum lipid value between sexes did not make the significant difference of level statistically in all items which can be inspected. 3) The weight change and serum lipid value are very significantly related. Total cholesterol, HDL cholesterol and total lipid value are high in female if the weight is light. But they are high in male the weight is heavy phospholipid value is opposite to the above result. Triglyceride value is high in male regardless the weight, but the significant difference happened in the high weight group. 4) As serum lipid value of hypertension patients is compared with that of the normal subjects, HDL cholesterol, triglyceride, phospholipid and total lipid value are significantly high. 5) The doubtful group of the fatty infittration of liver among the hypertension pafients have very significant difference in serum lipid value compared with not only the value of the normal subject but also that of the obesity group. 6) The doubtless group of the fatty infitration of liver among the hypertension patients have the significant difference in all serum lipid value compared with that of the normal subject, but compared with the obesity group males had the significant difference of HDL cholesterol value and both sexes had the significant difference in total lipid value, but had no significant difference in total cholesterol, triglyceride and phosprolipid value. 7) The ratio of total cholesterol per HDL cholesterol had the significant difference in the doubtful hypertension patients of the fatty infittration of liver and the relative weight, but it had no significant difference compared with the normal subject in the doubtless hypertension patients.

• 사상체질의학회지
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• 제17권2호
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• pp.74-84
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• 2005

1. Objectives The purpose of this study is to find out effects of Choeongsimyeonja-tang and Taeumjowi-tang on the against decline of physical function as aging. 2. Methods In Wistar rat 10, 30, 50 week and 40 week Choeongsimyeonja-tang & Taeumjowi-tang between 10 weeks form condition change of weight, change of intestine weight, hematology, blood chemistry, research result about serum content following conclusion get. 3. Results and Conclusions 1. Observed gain in weight than control group form of Cheongsimyeonja-tang & Taeumjowi-tang to aged Wistar rat. 2. Is thought to promote activation of living body action gaining intestine weight along with gain in weight. 3. Displayed decrease of MDA's content of serum than control group form of Cheongsimyeonja-tang & Taeumjowi-tang to aged Wistar rat. 4. Change that is Wistar rat's hematological value by aging according to 10, 30, 50 week WBC, RBC, Hgb, monocyces, eosinophil ere. increase, and HCT, PLT ere. showed tendency that decrease accorcling to old-week, and observed improvement that is hematological value than control group form of Cheongsimyeonja-tang & Taeumjowi-tang.5. Change that is Wistar rat's biochemical value by aging was measured highest in 50 week because ALT, AST, BUN, CRN, T-bili., T-chol., TG, TP, ALB, A/G. P ete. increase according to 10, 30, 50 week, and observed improvement that is biochemical value than control group form of Cheongsimyeonja-tang & Taeumjowi-tang. Is considered by being effect that Cheongsimyeonja-tang & Taeumjowi-tang living body function decline by aging by this result.

• 혜화의학회지
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• 제13권2호
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• pp.317-326
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• 2004

Administrating PalMoolGoonJaTang and SipIMiGwanJungTang to 40-weeks-(old Wistar rat for 10 weeks so, I researched into weight change, weight change of internal organ, and hemtological and serological changews. Then I got these conclusions. 1. Observed gain in weight than control group form of SipIMiGwanJungTang to aged Wistar rat. 2. Is thought to promote activation of living body action gaining intestine weight along with gain in weight. 3. Displayed decrease of MDA's content of serum than control group form of SipIMiGwan JungTang to aged Wistar rat. 4. Change that is Wistar rat's hematological value by aging according to 10, 30, 50 week WBC, RBC, Hgb, monocytes, eosinophil etc. increase, and HCT, PLT etc. showed tendency that decrease according to old-week, and observed improvement that is hematological value than control group form of SipIMiGwanJungTang 5. Change that is Wistar rat's biochemical value by aging was measured highest in 50 week because ALT, AST, BUN, CRN, T-bili., T-chol., TG, TP, ALB, A/G, P etc. increase according to 10, 30, 50 week, and observed improvement that is biochemical value than control group form of SipIMiGwanJungTang As those results, PalmoolGoonJaTang and SipIMiGwanJungTang are effective against dacline of physical function as aging. Moreover, considered to the serogical results, SipIMiGwanJungTang is much more effective than the other.