• Nuclear Engineering and Technology
• /
• 제54권3호
• /
• pp.1071-1084
• /
• 2022

The present study aims to investigate the dynamic properties of a novel isolation system composed of separate rubber and wire isolators. The testing program comprised pure compressive, pure-shear, compressive-stress dependence, and shear-strain dependence tests that used full-scale test specimens according to ISO 22762-1. A total of 22 test specimens were fabricated and investigated. Among the tests, the pure compressive test was a destructive test that reached up to the failure stage, whereas the others were nondestructive tests before the failure stage. Similar to the pure-shear test, at each compressive-stress level in the compressive dependence test or at each shear-strain level in the shear-strain dependence test, the cyclic loading was conducted for three cycles. In the nondestructive tests, examination of the dynamic shear properties in the X-direction was independent of the Y-direction. The test results revealed that the increase in the shear strain increased the energy dissipation but decreased the damping ratio, whereas the increase in the compressive stress increased the damping ratio. In addition, a macro model was developed to simulate the load-displacement response of the isolation systems, and the prediction results were consistent with the experimental results.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2000년도 봄 학술발표회 논문집
• /
• pp.93-100
• /
• 2000

In this study, we used photoelastic coating method which is a kind of model test for examining the stress condition of rock masses around underground structures. Using this method, we could know adaptability and usefulness of photoelastic coating method for various shape of tunnel models. And, in spite of higher cross section efficiency, square shape model showed unstable status because of high stress concentration. So, we cut the slits at the each corner of tunnel, and we could make more stable stress condition by means of moving high stress concentration to rock mass.

• 한국지반공학회지:지반
• /
• 제12권3호
• /
• pp.5-16
• /
• 1996

실리카질 모래에 대한 많은 시험결과로부터 삼축압축시첩과 평면변형시험간의 강도관계를 밀도와 파괴시 유효평균주응력의 함수로 표현하였다. 또한 파괴시 평균주응력과 축차응력간의 응력비가 내부마찰각의 함수로 잘 규정되었으며 그 비는 내부마찰각의 증가에 따라 감소하였다. 또한 중간주응력을 최대주응력과 최소주응력으로써 표현하였으며 이론적인 파괴면의 각도와 평면변형시험에서 관찰된 파괴면의 각도가 비교적 잘 일치함이 확인되었다.

• International Journal of Advanced Culture Technology
• /
• 제7권4호
• /
• pp.32-39
• /
• 2019

The purpose of this study was to identify the effects of visual programs on job stress and burnout in emergency room nurses. This study used a nonequivalent control group pretest-posttest design. There were 26 participants in the experimental group and 27 in the control group. Data collection took place from December 12, 2017 to February 17, 2018. The program comprised eight weekly 120-minutes sessions, which included understanding and assessing job stress and burnout. Data were analyzed using the Chi-square test, paired t-test, and independent t-test. As a result, levels of job stress (t=-20.09, p<.001) and burnout (t=-22.31, p<.001) decreased significantly in the experimental group. The results suggest that the Visual Media Program could be an effective strategy for reducing job stress and burnout. Therefore, it is deemed a useful intervention for improving the quality of nursing care provided in emergency rooms.

• 문화기술의 융합
• /
• 제7권1호
• /
• pp.194-201
• /
• 2021

본 연구는 간호대학생을 대상으로 지각된 스트레스, 자아존중감, 전공만족도가 시험불안에 미치는 영향을 확인하여 시험불안을 조절하기 위한 기초자료를 제공하고자 시도되었다. 연구참여자는 B시의 간호대학생 251명을 대상으로 하였다. 자료분석은 SPSS 22.0 프로그램을 이용하여 실수, 백분율, 평균, 표준편차, t-test, ANOVA, 피어슨 상관계수, 다중회귀분석으로 분석하였다. 대상자의 시험불안은 2.97±.54점이었고, 일반적 특성에 따른 시험불안의 차이를 분석한 결과 성별(t=-3.241, p=.001), 대학생활만족도(F=5.682, p=.004)에서 유의한 차이를 나타냈다. 연구대상자의 시험불안은 지각된 스트레스(r=.361, p<.001)와는 정적상관관계, 자아존중감(r=-.186, p=.003)과는 부적상관관계를 나타냈다. 대상자의 시험불안에 영향을 미치는 요인은 지각된 스트레스, 성별로 나타났고, 설명력은 14%로 확인되었다. 본 연구결과를 통하여 간호대학생을 대상으로 시험불안에 영향을 미치는 요인을 확인함으로써 시험불안을 중재할 수 있는 기초자료로 활용할 수 있을 것이다.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
• /
• pp.979-986
• /
• 2008

In this study, it enforced DMT test, CPTu test, laboratory consolidation test, because it estimated stress history of Gwangyang port marine clay. Through DMT test obtained Horizontal stress index($K_D$), predicted overconsolidation ratio by $K_D$. To compare empirical equation with laboratory consolidation test and CPTu test calculated OCR examined application. The result, Powell & Uglow(1988) method underestimated OCR value in comparison with Suggestion. Comparatively Byeon wi yong(2004) and Chang(1991) method seem to exactly predict in-situ stress states. Sugawara(1988) method of CPTu test seems to underestimate OCR.

• 대한예방한의학회지
• /
• 제13권2호
• /
• pp.27-38
• /
• 2009

Objective : This study was to examine a relationship among subjective psychological stress, physical stress response and oxidative stress. Methods : The subjects were consisted of 87 healthy volunteers. To assess subjective psychological stress, SRI(stress response inventory) was completed. To assess psychological and physical stress response, HRV(Heart Rate Variability) were tested. To assess oxidative stress, d-roms(Derivatives of reactive oxygen metabolites test) test was conducted. Subjects were divided into 3 groups depending on SRI(Stress Response Inventory) score, low stress response(LSR: lower than 30 percentile), Medium(MSR: 30-70 percentile) and high stress response(HSR: higher than 70 percentile). The Relationship between Stress Response and Oxidative Stress was estimated by correlation and One-way ANOVA analysis. Results : There were no significant differences of demographic data among 3 groups. There was a significant difference of oxidative stress among 3 groups. Conclusion : Our results suggest that there is a weak positive correlation between subjective psychological stress and oxidative stress. There is a significant difference of oxidative stress between HSR group and LSR group.

• 대한간호학회지
• /
• 제27권4호
• /
• pp.912-922
• /
• 1997

The purpose of this study was to examine the effect of supportive nursing on stress reaction of breast cancer patients undergoing chemotherapy. The nonequivalent control group pre-test/post-test design was used for this experimental study. The subjects were 32 patients who were receiving chemotherapy after mastectomies at K hospital in Taegu from June, 1994 to June 1995. Among 32 subjects, 16 were placed in the experimental group and 16 in the control group. The experimental and control groups were tested for general characteristics, trait anxiety, health locus of control, family support, state anxiety, hopelessness, physical stress, and anxiety behavior. Collected data was analized by means of a chisquare test and a t-test for the comparative analysis of the general characteristics and homogeneity of subjects. ANOVA, and MANOVA were used for testing the hypothesis. Reliability of the tools were analyzed using the Pearson Correlation coefficient. The results of this study were as follows : 1. The hypothesis : The stress reaction of the experimental group which took supportive nursing was lower than the stress reaction of the control group : this was supported statistically. The main variable influenced in stress reaction was hopelessness. Supportive nursing for breast cancer patients, who are receiving chemotherapy, was especially effective in the reduction of hopelessness compared to state anxiety, physical stress, and anxiety behavior. 2. An analysis of the difference on stress reaction, according to the frequency of supportive nursing between the control and experimental group, showed the level of hopelessness of the experimental group was lower than the control group after four supportive meeting sessions. But there was no statistical difference in state anxiety, physical stress, and anxiety behavior. In conclusion, this study supported utilization of supportive care as well as demonstrating the effectiveness of the System-Developmental Stress Model developed by Chrisman and Riehl-Sisca.

• 한국항해항만학회지
• /
• 제36권5호
• /
• pp.395-400
• /
• 2012

흙의 응력-변형 관계는 흙의 종류, 밀도, 응력수준 및 응력경로에 의존한다. 이들 요소들을 통합한 구성모델의 개발을 통해 정확한 흙의 응력-변형관계가 예측되고 있다. 본 연구에서는 백마강 모래를 이용하여 등방압축-팽창실험과 일련의 응력경로를 달리한 배수삼축압축시험을 통하여 응력경로에 따른 Lade의 단일항복면 구성모델의 토질매개변수 특성에 대하여 알아보았다. 그 결과 항복기준에 관련된 토질매개변수 h, ${\alpha}$는 응력수준 및 응력경로에 대한 영향이 미소하며, 응력-변형거동에 미치는 영향이 작은 것을 확인할 수 있었다. 그리고 항복함수에 관련된 토질매개변수 h와 ${\alpha}$는 파괴규준에 관련한 토질매개변수와 관련성이 매우 높아 ${\eta}_1$에 관한 식으로 대체할 수 있으며, 이 식을 이용한 수치해석 결과 양호하게 예측하고 있는 것을 확인 할 수 있었다.

• 한국콘텐츠학회논문지
• /
• 제19권4호
• /
• pp.532-545
• /
• 2019

본 연구의 목적은 아동보호전문기관 상담원을 대상으로 이차외상스트레스 예방을 위한 레질리언스 훈련프로그램의 효과를 확인하고자 하는 것이다. 이를 위해 유사실험설계를 활용하여 아동보호전문기관 상담원을 대상으로 실험집단 9명, 비교집단 10명으로 구성하였으며, 프로그램 사전, 사후, 프로그램 종료 3개월 후 추후조사를 통해 프로그램의 효과를 확인하였다. 이차외상스트레스 예방 프로그램은 아동보호전문기관 상담원의 이차외상스트레스와 우울 수준을 감소시키는데 효과가 있는 것으로 나타났으며, 스트레스 대처는 증가시켰지만 통계적 유의성은 없는 것으로 나타났다. 추후조사에서는 이차외상스트레스, 우울, 스트레스 대처의 변화는 통계적으로 유의하지 않았다. 이러한 결과를 통해 이차외상스트레스 예방 프로그램의 효과를 확인하였으며, 또한 효과를 지속시키기 위해서는 지속적인 개입이 필요하다는 것을 알 수 있었다. 연구결과에 기초하여 이차외상스트레스 예방 프로그램의 필요성과 활용방안에 대하여 제언하였다.