• Journal of the KSME
• /
• v.21 no.1
• /
• pp.21-31
• /
• 1981

원자력발전소의 원자로냉각재 압력경계의 건전성과 안정성을 확보하기 위하여 법적 요구조건을 설정함에 있어 파괴역학이 어떻게 적용되었는 가를 설명하였다. 이를 요약하면 다음과 같다. 1) 압력경계에 사용되는 재료의 $RT_{NDT}$를 정의하였다. 이는 무연성천이온도와 같은 개 념의 것으로, 앞으로 재료의 파괴인성은 이 $RT_{NDT}$에 대한 상대온도의 함수로 주어진다. 2)비연성파괴를 방지하기 위한 설계조건으로서 선형탄성 파괴역학에 근거한 조건식을 인용하였다. 여기서 조건식이란 능력확대계수의 합계가 어떠한 조건에서도 이러한 조건식을 만족한다는 것을 해석적으로 확인하고 규제당국의 승인을 받아야 한다. 3) 가동중검사에 발견된 결함으로 합격수준을 초과하는 것은 파괴역학적으로 해석하여 구조적 으로 안전하다는 것은 파괴역학적으로 해석하여 구조적으로 안전하다는 것을 입증하여야 한다. 이때 결함은 원자로의 가동과 더불어 성장하므로 수명기간중 피로파괴에 이를 것인지의 여부도 평가하여야 한다. 이때의 대조균열성장률은 Paris의 power law에 따른다. 4) 고속중성자 (E>1. 0MeV)에 의한 조사취화를 감시하기 위하여 감시시험계획을 사전에 수립 하고 이에 따라 감시시험을 수행하여 조사에 수립하고 이에 따라 감시시험을 수행하여 조사에 의한 원자로용기 재료의 파괴인성의 저하를 평가하여 이를 고려한 충분한 안전여유를 갖는 운 전조건 즉, 압력-온도 한계곡선을 산출하여야 한다. 이때의 취화 정도는 DELTA. $RT_{NDT}$ 와 Upper Shelf Energy의 감소로 나타낸다. 또한, 압력-온도 한계곡선은 선형관성 파괴역학에 입각한 조건식을 이용하여 해당 온도에서의 압력을 산출한다. System을 개발 사용하기 위하여 기존 전자계산소를 이용하는 방법이 바람직하며 System의 도입은 자체운영을 결정하기 전에 경제적인 여건 등 여러가지 문제를 검토하여야 한다. 특히 Turn Key Base로 System를 도입할 경우에는 System의 도입목 적과 사용빈도, 앞으로의 확장성 현재 설계및 생산 과정과의 마찰가능성, 유지보수문제 등을 신 중히 검토하여야 한다. 이제 기계공업도 전자계산기를 이해하고 사용하므로 서 발전할 수 있는 단계가 되었다. 예로부터 좋은 공구를 개발하여 적절히 사용하는 것이 기계공업 발전의 첩경이 었다. 전자계산기는 현대 기술이 개발한 가장 강력하고 사용하기 좋은 공구이다.점에서 피로구열의 안정성장을 논하고, 과거 10여년간의 피로 crack문제에 대한 연구방법, 실험방법 등을 소개하는 방향으로 고 를 진행시켜 나가겠다.에 그 효과가 증대됨을 알 수 있었다.적용한 임상실험이 수행되어야 할 것이다. 또한 위치결정에서 획득한 좌표값의 정확성을 알아보기 위해서 팬톰을 이용한 방사선조사 실험이 추후에 실행되어져야 할 것이다. 그리고 제작된 프레임에 Rotating X선 시스템과 내부 장기의 움직임을 계량화하고 PTV에서의 최적 여유폭을 설정함으로써 정위 방사선수술 및 3 차원 업체 방사선치료에 대한 병소 위치측정과 환자의 자세에 대한 setup 오차측정 결정에 도움이 될 수 있을 것이라고 사료된다. 상대적으로 우수한 것으로 나타났으며, 혼합충전재는 암모니아의 경우 코코넛과 펄라이트의 비율이 7：3인 혼합 재료 3번과 소나무수피와 펄라이트의 비율이 7：3인 혼합 재료 6번에서 다른 혼합 재료에 비하여 우수한 것으로 나타났다. 4. 코코넛과 소나무수피의 경우 암모니아 가스에 대한 흡착 능력은 거의 비슷한 것으로 사료되며,

• Journal of Korean Home Economics Education Association
• /
• v.21 no.1
• /
• pp.107-121
• /
• 2009

The purposes of this study is to find the differences in middle school students' need and application of resources management and environment according objective and subjective variables. The samples are 415 middle school students in Kangneung. For the statistics analysis of this study, frequency, mean, Cronbach's $\alpha$ coefficient, one way ANOVA, t-test, Duncan Multiple Range's Test were calculated. The results of this study are summarized follows; 1) Middle school students' need of Resources Management and Environment is relatively high, but application is relatively low. 2) Variables that affect middle school students' need of Resources Management and Environment are education of mother, degree of interest in Technology-Home Economics, degree of recognition of Technology-Home Economics and degree of preference for Technology-Home Economics. 3) Variables that affect middle school students' application of Resources Management and Environment are age of father, degree of interest in Technology-Home Economics, degree of recognition of Technology-Home Economics and degree of preference for Technology-Home Economics. 4) Relationship of middle school students' need and application of Resources Management and Environment are positive.

• Journal of Korean Home Economics Education Association
• /
• v.20 no.4
• /
• pp.139-155
• /
• 2008

The purpose of this study was to investigate the relation among father's child-rearing involvement, father-child communication style, children's achievement motivation and school adjustment. The subjects were 236 - 5th and 6th graders of elementary schools in Daegu. The major findings were as follows: first, children's achievement motivation was affected by father's child-rearing involvement. Second, children's achievement motivation was affected by father-child communication style. Third, children's school adjustment was affected by father's child-rearing involvement. Fourth, children's school adjustment was affected by father-child communication style. Fifth, children's school adjustment was affected by achievement motivation. Sixth, father's open communication style was the most important variable to teacher adjustment compared to other variable. Children's achievement motivation was the most important variable to peer adjustment compared to other variable. Father's leisure activity involvement was the most important variable to school education adjustment compared to other variable. Children's achievement motivation was the most important variable to school rule adjustment compared to other variable.

• Journal of the Korean earth science society
• /
• v.23 no.5
• /
• pp.424-435
• /
• 2002

This study analyzes the surface ozone and meteorological data in Daegu for a period from 1997 to 1999. It also investigates the meteorological characteristics of high ozone episodes. For this study the high ozone episode has been defined as a daily maximum ozone concentration higher than 100ppb in at least one station among six air quality monitoring stations in Daegu, Korea. The frequency of episodes is 13 days. The frequency is the highest in May and September. The average value of daily maximum ozone concentration is 81.6ppb, and 8-hour average ozone concentration is 58.6ppb for the high episodes. This shows that ozone pollution is continuous and wide-ranging in Daegu. The daily maximum ozone concentration is positively correlated to solar radiation and daily maximum temperature, but negatively correlated to relative humidity, wind speed and cloud amount. The maximal correlation coefficient to solar radiation is 0.45. The differences between high ozone episode day's daily mean meteorological value and monthly mean value are +1.58hPa for sea level pressure, +3.45${\circ}$C for maximum temperature, -5.69% for relative humidity, -0.46ms$^{-1}$ for wind speed, -1.79 for cloud amount, and +3.97MJm$^{-2}$ for solar radiation, respectively. This shows that strong solar radiation, low wind speed and no precipitation between 0700${\sim}$1100LST are favorite conditions for high ozone episodes. It is related to the morning stagnant condition.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.5
• /
• pp.86-94
• /
• 2016

The purpose of this study was to investigate the factors influencing empathy with the elderly in student nurses and to provide the basic data on nursing education to improve empathy. Data were collected from 277 student nurses in B and C cities and analyzed by the t-test, ANOVA, Pearson correlation coefficients, and multiple regression using SPSS WIN 20.0. The degree of empathy with the elderly in the student nurses was $214.66{\pm}22.72$. There were positive correlations between empathy and attitude of the elderly (r=.224, p<.001) and between empathy and facilitative communication (r=.346, p<.001), and these factors explained 15.4% of the empathy with the elderly. These results indicated that it is necessary to develop a nursing education program and curriculum for increasing empathy in student nurses.

• Journal of radiological science and technology
• /
• v.33 no.4
• /
• pp.349-354
• /
• 2010

March-June 2010 I hospitals and N of 22 patients in the hospital by DXA and QCT BMD measured at the same object were compared, statistical methods SPSS for Windows program (version 12.0) using the frequency analysis and t-test with a bone age, height, weight, the correlation analysis results were as follows. The distribution of study subjects 19 cases were male and 3 female patients, total 22 patients, 37 years of age ranged from 28 years of age. The mean age of 32.14 years old, and their average height is 170.59 cm, with the average weight was 69.41 kg. In addition to DXA and QCT of how the L2-L4 BMD in level average correlation coefficient was 0.378 with a significant quantitative correlation. Analysis by age rather than the QCT method to DXA showed that 10.8% more valuable, than height level analysis to DXA, QCT method showed 3.4 percent more useful, weight level analysis to DXA is more useful than the 1.2% QCT method was. More results from this study to measure bone density in the DXA method is useful in the age and height and weight by some in the QCT method proved to be useful. Therefore, bone mineral density in patients' age, height, weight, depending on the selection of accurate measurement is considered to be considered.

• Journal of Korea Water Resources Association
• /
• v.51 no.10
• /
• pp.839-852
• /
• 2018

The purpose of this study is to predict monthly agricultural reservoir storage by developing weather data-based Multiple Linear Regression Model (MLRM) with precipitation, maximum temperature, minimum temperature, average temperature, and average wind speed. Using Naïve-Bayes classification, total 1,559 nationwide reservoirs were classified into 30 clusters based on geomorphological specification (effective storage volume, irrigation area, watershed area, latitude, longitude and frequency of drought). For each cluster, the monthly MLRM was derived using 13 years (2002~2014) meteorological data by KMA (Korea Meteorological Administration) and reservoir storage rate data by KRC (Korea Rural Community). The MLRM for reservoir storage rate showed the determination coefficient ($R^2$) of 0.76, Nash-Sutcliffe efficiency (NSE) of 0.73, and root mean square error (RMSE) of 8.33% respectively. The MLRM was evaluated for 2 years (2015~2016) using 3 months weather forecast data of GloSea5 (GS5) by KMA. The Reservoir Drought Index (RDI) that was represented by present and normal year reservoir storage rate showed that the ROC (Receiver Operating Characteristics) average hit rate was 0.80 using observed data and 0.73 using GS5 data in the MLRM. Using the results of this study, future reservoir storage rates can be predicted and used as decision-making data on stable future agricultural water supply.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.10
• /
• pp.582-590
• /
• 2016

The purpose of this study is to investigate the relationship between suicidal attitude and suicidal ideation of college students and also to provide the fundamental data in order to strengthen both the standard and the recommendation of media coverage in Korea. A total of 249 college students over the age of 18 years in B city and G do were enrolled for this study. The data were collected between June 9 and July 7 of 2014 and analyzed by using descriptive statistics, t-test, ANOVA, Pearson correlation coefficients, and multiple regression with SPSS 21.0. The mean score of a message of suicidal motivation reports 2 was $51.06{\pm}10.55$, which was the highest. The score of suicidal ideation was $10.41{\pm}12.88$. There were sign&ificant differences in suicidal thought with respect to school system, family income, pocket money, time of physical activity, smoking, and smart-phone usage in university students. It was shown that suicidal thoughts were significantly correlated with message of simple suicidal reports 1(r=.303, p<.001), message of suicidal motivation reports 2(r=.251, p<.001), and message of suicidal mourning man reports 3(r=.225, p<.001). As the suicidal attitude have a close association with reports of suicide, it is necessary that studies on a variety of factors influencing suicidal thoughts of students be repeated.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.9
• /
• pp.610-618
• /
• 2016

This study was conducted to investigate the level of moral sensitivity, critical thinking disposition and perceived ethical confidence, as well as to identify the factors influencing the perceived ethical confidence in nursing students. The study evaluated 170 nursing students in D Province from May 16-20, 2016. Data were analyzed using a t-test, one-way ANOVA, Pearson's correlation and multiple regression. The mean score of the perceived ethical confidence was $3.54({\pm}0.51)$, the moral sensitivity was $4.92({\pm}0.59)$ and the critical thinking disposition was $3.45({\pm}0.39)$. There were positive correlations between the perceived ethical confidence and moral sensitivity (r=0.410, p<0.001) and critical thinking disposition (r=0.523, p<0.001). The significant factors influencing the perceived ethical confidence were moral sensitivity and critical thinking disposition, which explained 33.2% of the variance in perceived ethical confidence. Based on these findings, programs and teaching methods that develop moral sensitivity and critical thinking disposition are necessary for college nursing students to promote perceived ethical confidence.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.9
• /
• pp.279-291
• /
• 2016

The objective of this study is to determine the structural relationships among the infant's temperament, father's involvement in child-rearing, and the infant's social and emotional behavior. To this end, research was conducted with 330 parents of infants aged 1 and 2 in 55 day care centers located in J city and I city, Jeollabukdo. Frequency analysis, reliability analysis, correlation analysis, confirmatory factor analysis, and structural model equation analysis were conducted using SPSS 21.0 and AMOS 21.0. First, the results of the structural model equation analysis showed that the infant's temperament had a negative correlation with leisure and guidance, while it had a positive correlation with activity and impulsivity, which are external manifestations of their social and emotional behavior. Father's involvement in child-rearing had a negative correlation with the adaptability and mood aspects of the child's temperament, and also with general anxiety, an internal aspect of his or her social and emotional behavior. Social and emotional behavior had a positive correlation with the approach avoidance aspect of the infant's temperament. Second, according to the results of the analysis of the route between the variables, infant temperament was found to be a significant route, having a statistically negative correlation with father's involvement in child-rearing. The results of this study showed that infant's temperament and father's involvement in child-rearing had effects on the infant's social and emotional behavior, and suggested the importance of having a proper understanding of the educational implications of the father's involvement in child-rearing, in terms of its effects on the infant's social and emotional behavior.