• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1997년도 가을 학술발표회 논문집
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• pp.103-110
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• 1997

The objective of this study is to provide the information on the small-scale model mix proportion when the behavior of prototype concrete pavement is studied through small-scale model experiments. However it is difficult to obtain a model material to simulate the prototype concrete by scaling the individual components according to the laws of similitude. In this paper, the stress-strain behavior in uniaxial compression is used as a means to correlate materials similitude between the prototype and the model concrete. Based on th results of experiments, We compared the stress-strain curves of prototype and model concrete mixes using a nondimensional basis. In order to simulate the stress-strain curves of prototype concrete, it is important that various mix as of model concrete selected properly which are varied from aggregate grading, cement-aggregate and sand-aggregate ratio.

• International Journal of Concrete Structures and Materials
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• 제9권4호
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• pp.463-473
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• 2015

Three full-scale instrumented test slabs were constructed and tested using a heavy vehicle simulator (HVS) to evaluate the structural behavior of internally cured concrete (ICC) for use in pavements under Florida condition. Three mix designs selected from a previous laboratory testing program include the standard mixture with 0.40 water-cement ratio, the ICC with 0.32 water-cement ratio, and the ICC mixture with 0.40 water-cement ratio. Concrete samples were prepared and laboratory tests were performed to measure strength, elastic modulus, coefficient of thermal expansion and shrinkage properties. The environmental responses were measured using strain gages, thermocouples, and linear variable differential transformers instrumented in full-scale concrete slabs. A 3-D finite element model was developed and calibrated using strain data measured from the full-scale tests using the HVS. The results indicate that the ICC slabs were less susceptible to the change of environmental conditions and appear to have better potential performance based on the critical stress analysis.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 세계 도시지반공학 심포지엄
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• pp.194-205
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• 2009

In geotechnical engineering, the mechanical characteristics of soil, the main material of geotechnical engineering, is highly related to the confining stress. Reduced-scale physical modeling is often conducted to evaluate the performance or to verify the behavior of the geotechnical systems. However, reduced-scale physical modeling cannot replicate the behavior of the full-scale prototype because the reduced-scale causes difference of self weight stress level. Geotechnical centrifuges are commonly used for physical model tests to compensate the model for the stress level. Physical modeling techniques using centrifuge are widely adopted in most of geotechnical engineering fields these days due to its various advantages. In this paper, fundamentals of geotechnical centrifuge modeling and its application area are explained. State-of-the-art geotechnical centrifuge equipment is also described as an example of KOCED geotechnical centrifuge facility at KAIST.

• 한국심리학회지 : 문화 및 사회문제
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• 제14권3호
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• pp.21-40
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• 2008

본 연구는 운전 중 발생하는 스트레스를 측정할 수 있는 운전 스트레스 척도의 개발과 그 타당화에 대한 연구를 목적으로 실시되었다. 이 목적을 위하여 전국 7개 지역의 412명의 운전자들에게 121개의 운전 스트레스 척도 예비문항을 실시한 후 요인분석을 한 결과, 5개(진행장애, 운전환경, 사고단속, 법규준수, 시간압력) 요인으로 구성된 총 38개 문항의 운전 스트레스 척도(DSS)를 개발하였다. 이들 요인에 대한 신뢰도는 모두 .80이상으로 높게 나타났다. 타당화 연구를 위해서 운전 스트레스 척도(DSS)와 운전자 스트레스 척도(DBI-GEN) 그리고 운전자의 위험한 운전행동(음주운전, 과속운전, 법규위반, 피해사고, 가해사고)과의 상관관계 분석을 실시하였다. 상관관계 분석 결과 운전 스트레스 척도(DSS)는 운전자 스트레스 척도(DBI-GEN)와 운전자의 위험한 운전행동 모두에서 유의한 상관관계가 있는 것으로 나타났다. 또한 운전 스트레스 척도(DSS) 점수의 고·저에 따라 운전자의 위험한 운전행동(음주운전, 과속운전, 법규위반, 피해사고, 가해사고)에 영향을 주는 정도를 알아보기 위하여 운전 스트레스 척도 점수를 상위 25%와 하위 25%로 구별하여 더미변수 변환을 통한 중다 회귀분석을 실시하였다. 분석결과 운전 스트레스가 높은 집단은 위험한 운전행동에 유의한 정적 영향을 주며, 운전 스트레스가 낮은 집단은 유의한 부적 영향을 주는 것으로 나타났다. 끝으로 본 연구결과를 논의하고 운전 스트레스 척도(DSS) 개발과 관련된 시사점과 한계점을 논의하였다.

• 한국생활과학회지
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• 제8권2호
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• pp.227-243
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• 1999

The purpose of this study was to analyze a causal relations of children's learned helplessness, stress, perception of self-competence and mother's childrearing attitudes. The subjects were 370 of 4th and 6th grade in elementary school and the second grade in junior high school in Busan and their's mothers. The instruments used for this study were learned helplessness scale, stress scale, self-perception profile for children, and childrearing attitude scale. The data was analyzed with pearson's correlation, multiple regression and path analysis. The major findings of this study were as follows : 1. Children's global self-worth, social self, age and mother's controlling childrearing attitudes predicted children's stress. 21% of the variance of children's stress was explained by these variables. 2. Children's stress, global self-worth, academic and social self predicted children's learned helplessness. 54% of the variance of children's learned helplessness was explained by these variables. 3. 1) Global self-worth was the first contribution and had a indirect effect through stress as well as a direct effect on children's learned helplessness. 2) Children's stress and academic self had direct effect on children's learned helplessness. 3) Children's social self had a indirect effect through stress as well as a direct effect on children's learned helplessness. 4) Mother's affectionate childrearing attitudes had indirect effect through academic, and social self and global self-worth on children's learned helplessness. Mother's controlling childrearing attitudes had indirect effect through stress on children's learned helplessness. Children's age had a indirect effect through global self-worth and stress and children's sex had a indirect effect through social self on children's learned helplessness.

• 한국융합학회논문지
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• 제9권7호
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• pp.141-147
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• 2018

치위생과 학생들의 스트레스 부분을 스트레스 반응 척도를 이용하여 체계적으로 분석하여 대학생활 만족도와의 관련성을 파악하기 위하여 경남지역에 소재한 치위생과 학생 299명을 대상으로 스트레스, 스트레스 반응척도, 대학생활 만족도를 융합연구 하였다. 스트레스 반응척도에 따라 체계적으로 분석한 결과 피로와 좌절, 우울, 분노에서 높은 수치를 나타내었다. 또한 스트레스를 경험한 경우 만족도에도 부정적인 영향을 미쳤다. 스트레스는 심각한 경우 질병으로 이어질 수 있는 부정적인 영향을 줄 수 있다. 대학생활의 스트레스가 부적응과 불만족을 가중 시킬 것을 예상 할 때 스트레스 반응척도를 이용한 체계적인 분석 연구는 스트레스를 줄이고 대학생활 만족도 향상에 분명히 도움이 될 것으로 판단된다. 이에 대한 방안으로 치위생과에 맞는 스트레스 반응 도구의 개발과 분석을 제안한다.

• 대한한방부인과학회지
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• 제18권4호
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• pp.165-182
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• 2005

Purpose : To investigate the stress degree of infertile women and its correlations with Qi-stasis. Methods : 162 women, enrolled for treatment at oriental hospital, completed Infertility Stress Scale, Stress Response Inventory and Qi-stasis questionnaire. Their demographic features and infertility-related factors were recorded. 137 infertile women and 25 normal subjects were analyzed. Results : 1. 43 infertile women(33.86%) among the sample group were diagnosed as Qi-stasis. 2. There were close score correlations among Infertility Stress Scale, Stress Response Inventory, and Qi-stasis(p=.000). 3. Experience of Assisted Reproductive Technology (ART), possibility of spontaneous pregnancy, coitus frequency, whether the spouse is the eldest son or not had the influences on Infertility Stress. Abortion experience had influences on stress response and Qi-stasis. 4. It was revealed that Infertile women(n=137) had significantly higher scores of 'Infertility Stress' and subscales such as 'sexual satisfaction', 'marital satisfaction', 'familial adjustment', 'social adjustment' as well than control group(n=25). Conclusion : The results provide that the stress degree of infertile women had significant correlations with Qi-stasis and show the possibilities of oriental medicine treatment for stresses of infertile women.

• 한국직업건강간호학회지
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• 제19권2호
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• pp.268-277
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• 2010

Purpose: To examine the relations among occupational satisfaction, stress, and customer orientation of upper-scale general hospital nurses. Method: We studied with structured questionnaires with total 66 questions for 218 nurses working at university hospitals in Gangwon-do from February 2 to 22, 2010. Result: Occupational satisfaction and customer-oriented character increased when nurses' ages and career experiences were higher, married, working in daytime without shift and in higher positions. Occupational stress increased when nurses were younger, not married, with three shifts, and when they were general nurses. However, there was no statistical difference. Customer-oriented character had positive correlation with occupational satisfaction and stress while occupational satisfaction had negative correlation(r=-0.358) with occupational stress. Conclusion: As occupational stress and satisfaction of nurses in university hospitals showed significant relations with customer-oriented character, t is necessary to reduce occupational stress of nurses, and strengthen occupational satisfaction of them.

• 동의생리병리학회지
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• 제24권5호
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• pp.877-882
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• 2010

This study was designed to investigate job stress, job satisfaction and related factors of oriental medical doctors. The survey used administered questionnaire, was conducted from June 10 to June 30, 2010 in Jeonbuk province. Questionnaire was composed of general characteristics, socioeconomic status perception, job stress scale and job satisfaction scale. Job stress was related to sex, age, marriage, working form, working time, clinical career. Job satisfaction was related to age. Working time, working form and self-status perception influenced job stress. Self-status perception influenced job satisfaction. Especially, it was supposed that working time was most important factor to job stress.

• 성인간호학회지
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• 제23권4호
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• pp.397-402
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• 2011

Purpose: This study was designed to explore the relationship of depression with stress, anxiety and mindfulness in nursing students in 2010. Methods: A cross-sectional design was used and data was collected through structured questionnaires. Depression, stress, anxiety, and mindfulness were measured by using the Depression, Anxiety and Stress Scale (DASS) and the Mindfulness Attention Awareness Scale (MAAS). The data were analyzed using t-test, one-way ANOVA, Pearson correlation coefficient, and stepwise multiple regression. Results: A total of 131 nursing students participated in this study. Depression was positively associated with stress (r=.81, p<.001) and anxiety (r=.76, p<.001), and negatively associated with mindfulness (r=-.73, p<.001). Multiple regression analyses showed that in different type of residence, anxiety and mindfulness were statistically significant predictors of depression with explanatory power of 67%. Conclusion: When nurse instructors manage depression among nursing students, the strategies need to address stress, anxiety, and mindfulness. This study may help nursing students to better manage their depression.