• 한국강구조학회 논문집
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• 제10권1호통권34호
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• pp.1-10
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• 1998

교량의 신설 또는 보수를 위한 작업차량의 진출입로나 기존 통행차량의 우회를 목적으로 한시적으로 사용되는 가교량은 일반적으로 상부구조로 H-Beam, 하부구조로 H-Pile을 사용하여, 이들 각 부재를 고장력볼트로 연결한 강구조 형식을 채택하고 있다. 그러나 이러한 교량은 상부구조에 신축이음부를 두지 않고 있어 일일기온차에 의해 발생하는 온도응력이 전체 구조거동에 미치는 영향이 클 것으로 예상된다. 따라서, 본 연구에서는 상부구조인 H-Beam에 온도와 변형률의 상시계측을 위한 모니터링 시스템을 도입하여 측정된 온도 및 변형률 데이터로부터 발생온도와 온도응력의 관계를 조사하였으며, 구조해석을 통한 이론치와의 비교를 실시하여 각 부재에서 발생하는 온도응력이 전체 구조거동에 미치는 영향을 평가하였다. 그 결과, 본 구조물에서 발생하는 응력의 변화는 부재의 온도변화에 의한 온도응력이 주원인인 것으로 나타났으며, 하부구조인 H-Pile의 충분한 교축방향 변위로 인하여 상부구조인 H-Beam의 온도변형 구속은 이루어지지 않는 것으로 나타났다. 한편, 상부구조인 H-Beam간의 연결 강성이 충분하지 않아 전체 구조계보다는 부분 구조계에 대한 해석으로부터 얻어진 변형량이 측정 온도 및 응력으로부터 계산된 변형량과 잘 일치하는 것으로 나타났다.

• 융합정보논문지
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• 제11권7호
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• pp.223-231
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• 2021

본 연구는 뷰티산업종사자의 직무 스트레스와 조직신뢰, 이직의도와의 관계를 알아보는 데 있다. 연구대상은 뷰티산업종사자 3개월 이상 경력자 369명을 대상으로 하였다. 자료처리는 빈도 분석, 탐색적 요인분석, 신뢰도 분석, 상관관계 분석, 확인적 요인분석 및 구조 방정식 모델 검증을 실시하였다. 연구결과는 첫째, 뷰티산업종사자의 직무 스트레스는 이직 의도에 정(+)적인 영향을 미쳤다. 둘째, 뷰티산업종사자의 직무 스트레스 중 공정성 스트레스는 조직 신뢰에 부(-)적인 영향을 미쳤다. 셋째, 뷰티산업종사자의 조직에 대한 신뢰는 이직 의도와 부(-)적인 관계에 있었다. 결론적으로 본 연구를 통해 뷰티산업종사자들의 이직 의도에 조직 신뢰와 공정성 스트레스가 중요한 영향을 미치는 변인임을 알 수 있었다. 따라서, 본 연구는 뷰티산업종사자의 이직 의도 감소를 위해서 조직신뢰를 증진하고 공정성 스트레스를 감소시키려는 노력이 필요함을 시사한다.

• 한국컴퓨터정보학회논문지
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• 제27권2호
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• pp.145-151
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• 2022

본 연구는 현대를 살아가는 사람들이 생애주기별로 받는 스트레스 해소와 사회성 증진을 돕는 소셜미디어 플랫폼에 대해 알아보고자 하였다. 연구방법은 생애주기별 스트레스 특성과 사회성 그리고 소셜미디어에 대해 문헌적 연구를 하였다. 결과 현대를 살아가는 사람들은 생애주기별로 청소년기 중년기 노년기 등 다양한 스트레스 상황에 놓여 있으며, 특히 우리나라의 스트레스 지수는 점점 높아 지고 있다. 그 스트레스를 해결하기 위한 대처 방안으로 인터넷 기반의 소셜미디어 플랫폼을 활용하여 다양한 정보제공 및 접근이 필요하다고 보았으며, 복잡하고 다양한 개인 성향들과 개인주의적 활동에 각각의 성향과 욕구에 발맞춰 성향별 플랫폼 개발과 접근성이 용이하도록 해야 할 것이며, 관련 연구가 지속적으로 이뤄져야 한다고 제언한다.

• Fibers and Polymers
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• 제4권2호
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• pp.89-96
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• 2003

A vertebral cage is a hollow medical device which is used in spine forgery. By implanting the cage into the spine column, it is possible to restore disc and relieve pressure on the nerve roots. Most cages have been made of titanium alloys but they detract the biocompatibility. Currently PEEK (polyether ether ketone) if applied to various implants because it has good properties like heat resistance, chemical resistance, strength, and especially biocompatibility. A new shape of vertebral cage is designed and injection molding of PEEK is considered for production. Before injection molding of the cage, it is needed to evaluate process conditions and properties of the final product. Variables affecting the shrinkage of the cage are considered, e.g., injection time, packing pressure, mold temperature, and melt temperature. By using the numerical simula-tion program, MOLDFLOW, several cases are studied. Data files obtained by MOLDFLOW analysis are used for stress anal-ysis with ABAQUS, and shrinkage and residual stress fields are predicted. With these results, optimum process conditions are determined.

• 성인간호학회지
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• 제19권3호
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• pp.447-458
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• 2007

Purpose: This exploratory study was to identify the use of complementary and alternative medicine(CAM) in women with breast cancer and to analyze which factor influence CAM use. Methods: 114 patients with breast cancer were identified and approached. The instrument used to gather data were the common types, main reasons and effects as well as stress, mood states and fatigue. Results: 42.7% of all participants reported the use of CAM. The most common types of CAM used were Phellinus linteus, elm tree, and vitamin C. The main reasons for CAM use were to boost the immune system and to prevent recurrence. Prayer, massage, Shitake mushroom, and Ganoderma lucidum were, identified as being more effective than others. 93.6% of the respondents informed their physicians of their use of CAM. Logistic regression analysis determined that stress, mood states, and duration after diagnosis were factors significantly associated with CAM use. Conclusion: CAM use is increasing among patients with breast cancer. Health care professionals are in the main position to identify what treatments patients are using and implement CAM therapies that can be helpful to relieve patient symptoms related to treatment and psychological distress.

• 대한간호학회지
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• 제45권4호
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• pp.587-594
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• 2015

Purpose: To identify the effects of foot reflexology massage on fatigue, stress and depression of postpartum women. Methods: A nonequivalent control group pre-post design was used. A total of 70 women in a postpartum care center were recruited and were assigned to the experimental group (35) or control group (35). Foot reflexology massage was provided to the experimental group once a day for three days. Data were collected before and after the intervention program which was carried out from December, 2013 to February, 2014. Data were analyzed using Chi-square test, Fisher's exact test, and t-test. Results: The level of fatigue in the experimental group was significantly lower than the control group (t= - 2.74, p=.008). The level of cortisol in the urine of women in the experimental group was significantly lower than the control group (t= - 2.19, p=.032). The level of depression in the experimental group was significantly lower than the control group (t= - 3.00, p=.004). Conclusion: The results show that the foot reflexology massage is an effective nursing intervention to relieve fatigue, stress, and depression for postpartum women.

• 동의신경정신과학회지
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• 제31권1호
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• pp.13-23
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• 2020

Objectives: The purpose of this study was to review the research trends in the treatment of hatha-style yoga on Post Traumatic Stress Disorder (PTSD). Methods: We searched articles in Pubmed and the China National Knowledge Infrastructure (CNKI) January 2010-December 2019, for studies to treat PTSD using hatha-style yoga. Selected studies were evaluated by the CLEAR-NPT (A Checklist to Evaluate a Report of a Non-pharmacological Trial). Results: Seven randomized controlled clinical trials were selected. PSS-I (PTSD Symptom Scale-Interview) was the most frequently used as diagnostic criteria. The PCL (PTSD Checklist) was also the most commonly used outcome measurement. Of the seven articles, most studies reported that hatha-style yoga was effective to reduce symptoms of PTSD. Conclusions: Hatha-style yoga practice intervention can be used to relieve symptoms of PTSD. More studies should be conducted to make hatha-style yoga as protocol (complementary therapy) for PTSD patients.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.1086-1091
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• 2003

The problem of residual stresses and fatigue behavior in welded structures is the main concern of welding research fields. The residual stresses and distortions of structures by welding exert negative effect on the safety of mechanical structures. Postweld heat treatment is usually carried out to relieve this residual stresses of welded joints. In this paper the influence of postweld heat treatment on fatigue life of butt-welded joint was investigated. To predict the effect of PWHT, an analytical model is developed by finite element and local strain approach and the result of fatigue life analysis is compared to experimental results. It is demonstrated that fatigue life estimates closely approximate the experimental results and PWHT provides some increase of fatigue lives in long-life fatigue region and no increase in short-life fatigue region because of the residual stress relaxation under tensile loads.

• Child Health Nursing Research
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• 제24권3호
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• pp.287-297
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• 2018

Purpose: This study aimed to identify variables influencing the psychosocial adjustment of North Korean adolescent refugees in order to establish a structural equation model and design an intervention strategy to improve psychosocial adjustment. Methods: The subjects included 290 North Korean adolescent refugees aged 16~24 years who were enrolled in alternative schools or regional adaptation centers. They were surveyed using a structured questionnaire. Results: The goodness of fit measures of the model were as follows: $x^2=131.20$ (p<.001), GFI=.93, CFI=.91, TLI=.86, RMSEA=.08, and SRMR=.07. The results estimated from the structural equation model indicated a good fit of data to the hypothesized model, which proposed that stress and emotional intelligence are associated with psychosocial adjustment. The major variables influencing psychosocial adjustment were stress, emotional intelligence, which was a significant direct effect, whereas attitude of parenting showed an indirect effect on psychosocial adjustment through emotional intelligence. These variables account for 50.0% of psychosocial adjustment. Conclusion: It is necessary to develop a program and intervention plan that can enhance emotional intelligence and thereby relieve the stress of North Korean adolescent refugees. The program should also include parenting education so that parents have positive attitude of parenting.

• International Journal of Automotive Technology
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• 제8권2호
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• pp.243-248
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• 2007

The durability of a cylinder head is influenced by the thermal and mechanical history during the manufacturing process, as well as engine operation. In order to improve the durability of cylinder head, both load from engine operation and the preload conditions from the manufacturing process must be considered. The aluminum cylinder head used for a HSDI diesel engine is investigated to reduce the possibility of high cycle fatigue crack in this study. FE analysis is performed to elucidate the mechanism of high cycle fatigue crack in the HSDI diesel cylinder head. Two separate approaches to increase the durability of the cylinder head are discussed: reducing load from engine operation and re-arranging preload conditions from the manufacturing process at the critical location of the cylinder head. Local design changes of the cylinder head and modification of pretension load in the cylinder head bolt were investigated using FE analysis to relieve load at the critical location during engine operation. Residual stress formed at the critical location during the manufacturing process is measured and heat treatment parameters are changed to re-arrange the distribution of residual stress. Results of FE analysis and experiments showed that thorough consideration of the manufacturing process is necessary to enhance the durability of the cylinder head.