• 한국응급구조학회지
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• 제16권3호
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• pp.77-89
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• 2012

Purpose : The purpose of the study was to investigate the relationship between stress, depression, coping styles, and satisfaction of clinical practice in paramedic students. Methods : The study was conducted to 221 paramedic students who have experienced clinical training from March until June in 2012. Questionnaires consisted of level of stress, depression, coping styles, and satisfaction of clinical practice. The data were analyzed using descriptive statistics, t-test, ANOVA, and Pearson's correlation coefficient. Results : The mean score of stress was $2.69({\pm}.69)$, depression was $19.09({\pm}9.41)$, coping styles was $3.17({\pm}.47)$, and satisfaction of clinical practice was $3.61({\pm}.58)$. Stress had a significant positive correlation with depression and a negative correlation with active coping and satisfaction of clinical practice. Depression had a significant positive correlation with passive coping and a negative correlation with satisfaction of clinical practice. Active coping had a significant positive correlation with passive coping and satisfaction of clinical practice. Conclusion : There was a positive effect on decreasing stress and depression in paramedic students, and encouraging positive coping when the students received counseling and instruction for clinical practice.

• 한국심리학회지 : 문화 및 사회문제
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• 제29권4호
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• pp.455-476
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• 2023

본 연구는 묻지마 범죄가 주로 대인관계 문제에서 비롯되었고 제3의 무고한 대상에 대한 보복행위라는 특징에 착안하여, 사회적 배제 경험과 전위된 공격성의 관계를 확인하고 두 변인의 관계에서 스트레스와 사회적지지 등 관련 요인의 역할을 확인하고자 하였다. 이를 위해 만 19세 이상 49세 이하의 성인 남성 353명을 대상으로 사회적 배제 경험이 전위된 공격성에 미치는 영향에 대한 스트레스의 매개효과와 사회적지지의 매개효과 조절에 대한 가설을 세우고 이를 검증하였다. 주요 결과로는 첫째, 사회적 배제는 전위된 공격성에 정적인 영향을 미쳤다. 둘째, 스트레스는 사회적 배제와 전위된 공격성의 관계에서 부분적으로 매개하는 것으로 나타났다. 셋째, 스트레스의 매개효과를 사회적지지가 조절할 것이라는 가설은 검증되지 않았으나, 매개모형에서 사회적지지의 조건부 직접효과가 확인되었다. 즉, 사회적지지는 스트레스를 매개한 간접효과에는 영향을 미치지 않았으나 사회적 배제와 전위된 공격성 간의 직접효과를 조절하는 것으로 나타났다. 사회적 배제가 전위된 공격성을 예측하는 것은 사회적 지지 평균집단(mean)과 고집단(M+1SD)에서만 유의했으며 고집단으로 갈수록 증가하는 것으로 나타났다. 이는 사회적 지지가 높은 집단에서 오히려 전위된 공격성을 스트레스 조절 전략으로 사용한다는 의미로, 사회적 지지가 공격성을 낮추는 역할을 한다는 선행 연구들과는 상이한 결과다. 사회적지지 수준이 낮은 사람들은 사회적 배제 경험에도 불구하고 전위된 공격성의 사용빈도가 낮다는 의외의 결과를 보여주었다. 논의에서는 이러한 결과의 사회적 의미를 해석하였으며, 사회적 배제와 전위된 공격성의 관계를 구체화할 추가적인 연구 아이디어를 제안하였다.

• 한국지구과학회지
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• 제25권1호
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• pp.22-31
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• 2004

Laboratory experiments were conducted in order to find effects of the intermediate principal stress of ${\sigma}_{2}$ on rock fractures and faults. Polyaxial tests were carried out under the most generalized compressive stress conditions, in which different magnitudes of the least and intermediate principal stresses ${\sigma}_{3}$ and ${\sigma}_{2}$ were maintained constant, and the maximum stress ${\sigma}_{1}$, was increased to failure. Two crystalline rocks (Westerly granite and KTB amphibolite) exhibited similar mechanical behavior, much of which is neglected in conventional triaxial compression tests in which ${\sigma}_{2}$ = ${\sigma}_{3}$. Compressive rock failure took the form of a main shear fracture, or fault, steeply dipping in ${\sigma}_{3}$ direction with its strike aligned with ${\sigma}_{2}$ direction. Rock strength rose significantly with the magnitude of ${\sigma}_{2}$, suggesting that the commonly used Mohr-type failure criteria, which ignore the ${\sigma}_{2}$ effect, predict only the lower limit of rock strength for a given ${\sigma}_{3}$ level. The true triaxial failure criterion for each of the crystalline rocks can be expressed as the octahedral shear stress at failure as a function of the mean normal stress acting on the fault plane. It is found that the onset of dilatancy increases considerably for higher ${\sigma}_{2}$. Thus, ${\sigma}_{2}$ extends the elastic range for a given ${\sigma}_{3}$ and, hence, retards the onset of the failure process. SEM inspection of the micromechanics leading to specimen failure showed a multitude of stress-induced microcracks localized on both sides of the through-going fault. Microcracks gradually align themselves with the ${\sigma}_{1}$-${\sigma}_{2}$ plane as the magnitude of ${\sigma}_{2}$ is raised.

• 문화기술의 융합
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• 제9권2호
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• pp.99-104
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• 2023

본 연구는 목적은 아동의 학업 스트레스가 학교 적응에 미치는 영향을 살펴보고, 학업 스트레스와 학교 적응 간의 관계에서 자아탄력성이 매개 역할을 하는지 검증해 보고자 하였다. 한국아동패널 12차년도(2019년) 자료를 토대로 기초통계분석으로 주요대상자의 일반적 특성, 주요변인의 평균, 표준편차, 왜도 및 첨도를 확인하였고 변인 간 상관분석을 실시하였다. 또한 학업 스트레스가 학교 적응에 미치는 영향에서 자아탄력성이 매개하는지 살펴보기 위해 Baron과 Kenny의 절차를 따라 3단계 걸친 회귀분석을 실시하였다. 본 연구의 결과는 다음과 같다. 첫째, 아동의 학업 스트레스, 학교적응, 자아탄력성은 모두 유의미한 상관이 있는 것으로 나타났다. 학업 스트레스가 높을수록 자아탄력성과 학교적응력이 낮아졌다는 것을 의미한다. 둘째, 아동의 학업 스트레스와 학교적응 간의 관계에서 자아탄력성은 부분 매개 효과가 있는 것으로 확인 되었다. 학업 스트레스 상황에서 자아탄력성은 스트레스 상황을 객관적으로 파악하고 잘 대처하게 해 줌으로써 학교생활에 유연하게 적응해 나가게 하는 중요한 매개변인으로 작용한다는 것을 의미한다. 이에 우리는 아동이 학업 스트레스를 줄이고 학교생활에 잘 적응할 수 있도록 융통성 있는 탄력적인 개인의 특성이 필요함을 인식하고 적극적인 관심과 개입방안 마련을 모색할 필요가 있겠다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2008년도 추계학술대회 논문집
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• pp.77-80
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• 2008

Low-cycle fatigue (LCF) tests were carried out to investigate the effect of loading direction on the cyclic deformation behavior and fatigue resistance of rolled AZ31 magnesium alloy. The as-received alloy showed a strong basal texture indicating that the most of basal planes of hexagonal close-packed structure were located parallel to the rolling direction. Two types of specimens whose loading directions were oriented parallel (RD) and vertical (ND) to the rolling direction. respectively, were used for the comparison. It was found that RD specimens yielded at much lower stresses during compression, while vice versa for the ND specimens, which was mainly attributed to the formation of primary twins. This anisotropic deformation behavior resulted in the different mean stresses during the cycling of RD and ND specimens, affecting the fatigue resistance of two specimens. The ND specimen showed a superior fatigue resistance as compared to the RD specimen under strain-controlled condition.

• 한국전산유체공학회지
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• 제16권4호
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• pp.100-109
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• 2011

Large eddy simulation(LES) of fully developed turbulent pipe flow has been performed to investigate the effect of Reynolds number on the flow field at $Re_{\tau}$=180, 395, 590 based on friction velocity and pipe radius. A dynamic subgrid-scale model for the turbulent subgrid-scale stresses was employed to close the governing equations. The mean flow properties, mean velocity profiles and turbulent intensities obtained from the present LES are in good agreement with the previous numerical and experimental results currently available. The Reynolds number effects were observed in the higher-order statistics(Skewness and Flatness factor). Furthermore, the budgets of the Reynolds stresses and turbulent kinetic energy were computed and analyzed to elucidate the effect of Reynolds number on the turbulent structures.

• 한국초지조사료학회지
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• 제18권1호
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• pp.27-34
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• 1998

The present study elucidates of the effect of less water stress in different temperature condition on the emergence of forage grasses. Water condition was controlled to 30% and 60% by water content by wet soil. The mean temperature is conducted by $10^{\circ}C$ (out side) and $20^{\circ}C$ (glass house). The results are as follows: 1. Mean emergence time and emergence day after sowing of grasses were greatly influenced by water content of soil and temperature. It was suggested that temperature was very important for the light competition with weed in the early growth of grass. 2. Accumulatied emergence of grasses was nat afected by temperature, but it was sensitively affected by water content of soil.

• 한국약용작물학회지
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• 제21권1호
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• pp.1-6
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• 2013

Buckwheat (Fagopyrum esculentum) has been known for having strong anti-oxidant, anti-mutagenic, and anti-carcinogenic activities. The free radical theory of aging, also known as the oxidative stress theory of aging, claims that cellular oxidative damage accumulated with time is a major causal factor of aging. In the present study, we investigated the effect of buckwheat extracts on resistance to oxidative stress and aging using Caenorhabditis elegans as a model system. Survival under an oxidative-stress condition induced by paraquat increased markedly following 500mg/L buckwheat extracts treatment, suggesting lower cellular oxidative damage by buckwheat extracts. A lifespan assay also revealed that treatment of buckwheat extracts significantly extended both the mean and maximum lifespan in C. elegans. Interestingly, this lifespan-extension by buckwheat extracts was not accompanied by reduced fertility. These findings suggest that buckwheat extracts can confer longevity phenotype to C. elegans through its strong anti-oxidant activity and support the aging theory which emphasizes a pivotal role of oxidative stress during aging.

• 대한가정학회지
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• 제38권12호
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• pp.47-58
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• 2000

The purpose of this study was to investigate working mothers'parenting stress. The study was approached from an ecological perspective. Data were collected from 185 mothers who were professionals, office or labor workers, and have their children enrolled at the day care center located at their workplace. All the subjects lived in Seoul. The results of this study were as follows: 1. The working mothers'parenting stress was found to be at a moderate level(Mean=2.30). 2. The hierarchical and stepwise regression analyses revealed that significant variables in explaining the parenting stress of working mothers were the degrees of attachment with the subject's mother($\beta$=-.24), age($\beta$=-.23), the degrees of flexibility in working conditions($\beta$=-.19), educational level($\beta$=.18), the degrees of husbands'participation in child care($\beta$=-.17), and the number of children ($\beta$=.16). These variables explained 17.2% of working mother's parenting stress. 3. It was found that the effect of microsystem variables on working mothers' parenting stress were greater than the combined effects of mesosystem, exosystem and macrosystem variables.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2009년 추계학술발표대회
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• pp.102-102
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• 2009

The purpose of this study is to establish the predictive equation of transversal residual stress at the thick weldment of large container ship. In order to do it, the variables used for this study were restraint degree, yield strength of base material, thickness of weldment and welding heat input. Here, the level of restraint degree at the thick weldment of container ship having the various welding sequence was calculated using FEA. From the result, the h-type specimen was designed to simulate the level of restraint degree at the actual weldment of containership. With H-type test specimen designed, the effect of the variables on the distribution of transversal residual stress at the weldment in a container ship was evaluated using the comprehensive FEA. Based on the results, the predictive equations of mean value and the distribution of transverse residual stress in each location of residual stress were established using dimensional analysis and multiple-regression method. The validation of predictive equations was verified by comparing with measured results by XRD in the actual weldment of the ship.