• Corrosion Science and Technology
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• 제18권2호
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• pp.49-54
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• 2019

The purpose of this paper is to present failure analysis, of the heat exchanger tube in a district heating system. SS304 stainless steel is used, as material for the heat exchanger tube. The heat exchanger operates in a soft water environment containing a small amount of chloride ions, and regularly repeats operation and standstill period. This causes concentration of chloride ions on the outer surface of the tube, as well as repeat of thermal expansion, and shrinkage of the tube. As a result of microscopic examination, cracks showed transgranular as well as branched propagation, and many pits were present, at the initiation point of each crack. Energy disperstive spectroscopy analysis showed Fe and O peak, as well as Cl peak, meaning that cracks were affected by Cl ion. Failure of the tube was caused by chloride-induced stress corrosion cracking by thermal stress, high temperature, and localized enrichment of chloride ions.

• 대한교통학회:학술대회논문집
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• 대한교통학회 1998년도 Proceedings The 4th International Transport Symposium
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• pp.198-203
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• 1998

Through an analyses of the necessity and the practical meaning of the assets operation in railway transport enterprises, the authors argue that a railway transport enterprise shall lay equal stress on assets operation and production management, and suggest to take concrete steps on the basis of the aforesaid management strategy.

• 한국항행학회논문지
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• 제17권4호
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• pp.449-458
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• 2013

본 연구는 국내 항공사에 근무하는 외국인 객실승무원을 대상으로 그들이 서비스 업무를 수행함에 있어 서로 다른 문화차이로 인해 발생되는 문화적응스트레스가 직무만족에 미치는 영향에 대하여 파악하고자 하였다. 연구결과, 외국인 객실승무원의 문화적응스트레스에 국적은 유의한 영향을 미치는 것으로, 근무년수는 유의한 영향을 미치지 않는 것으로 나타났으며, 직무만족에 국적과 근무년수는 유의한 영향을 미치지 않는 것으로 나타났다. 또한 외국인 객실승무원의 문화적응스트레스는 직무만족에 부(-)의 영향을 미치는 것으로 나타났다. 이러한 분석결과를 바탕으로 자신의 나라와 다른 새로운 문화차이에서 오는 스트레스를 줄여줄 수 있는 방안과 조직 내에서 외국인 객실승무원과의 커뮤니케이션에 좀 더 다가갈 수 있도록 이들에 대한 좀 더 효율적인 제도가 필요하겠다.

• 대한한방부인과학회지
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• 제36권2호
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• pp.85-100
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• 2023

Objectives: To evaluate stress patterns and coping abilities in women with infertility by conducting in-depth interviews. Methods: Ten women with infertility who visited the Korean Medicine Hospital and provided consent after being informed of the purpose and method of the study were selected after meeting the inclusion/exclusion criteria. They were requested to complete a preliminary questionnaire developed by the researchers, the Infertility Stress Scale, and the Korean version of the Fertility Problem Inventory (FPI). Subsequently, each participant was interviewed individually. Results: The preliminary questionnaire was used to evaluate sensitivity to each type of infertility-related stress and ability to express and resolve it. Among all infertility stress types, the largest proportion, accounting for an average of 47.5±26.95%, was that felt by the patient herself. Considering stress awareness intensity, the stress felt by the patient was the highest, with an average score of 4.30±0.64. Relative stress sensitivity due to infertility was the highest, with an average score of 3.90±0.94. Compared with general work stress, the average ability to relieve stress related to problems with spouses was the highest, with a score of 2.50±1.20. The average Infertility Stress Scale score was 2.88±1.35 and FPI score was 2.87±2.52. Conclusions: The highest stress scores were observed for the following items: meaning of children, need for parenthood, and stress due to the diagnosis of infertility. The lowest stress scores were allocated to the item concerning relationships with friends and co-workers. Based on the in-depth interviews conducted after the survey, stress in women with infertility may be classified as emotional, physical, and economic. Thus, the requirement for providing appropriate psychological and emotional support depending on the stress type in addition to general medical treatment for infertility treatment was confirmed.

• 한국벤처창업학회:학술대회논문집
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• 한국벤처창업학회 2009년도 통합학술대회
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• pp.27-41
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• 2009

본 연구는 현실요법 집단상담 프로그램이 직장인의 직무스트레스 감소에 미치는 영향을 조사하였다. A지역의 30-40대 직장인을 대상으로 실험집단 10명과 통제집단 10명으로 무작위 배정하여 실험집단에게만 프로그램을 실시하였다. 측정도구는 한국인 직무스트레스 측정 검사 단축형으로 한국직무스트레스 학회에서 2년에 걸쳐 개발한 표준도구를 사용하였다. 수집된 자료를 연구 목적에 맞게 분석하기 위하여 t-test(t-검증)을 실시하였다. 연구결과는 현실요법 집단상담 프로그램에 참여한 실험집단의 직무스트레스가 통제집단에 비해 통계적으로 유의미하게 감소되었다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2007년도 춘계종합학술대회
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• pp.135-138
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• 2007

누구나 한번쯤은 스트레스란 말을 사용해본 경험이 있을 것이다. 왜냐면 살아가는 동안 주변의 여러 가지 정신적 육체적 압박, 갈등, 좌절, 결핍 등이 발생하기 때문이다. 그만큼 스트레스는 우리 주변에 언제나 존재하고 있다. 현재 대부분의 스트레스 측정방식은 심리적 방법과 생체적 방법으로 이루어져 있는데, 주관성, 객관성, 그리고 과학성의 불균형으로 스트레스 정도의 정확성이 부족하다. 따라서 본 논문에서는 심리적 측정결과와 생체적 측정결과를 혼합해서 지수화 하여 보다 스트레스 완화에 도움이 되기 위한 지수 처리 알고리즘을 제안한다.

• 소성∙가공
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• 제10권7호
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• pp.565-572
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• 2001

It is well known that a multicomponent $Zr_{4l.2}Ti_{13.8}Cu_{12.5}Ni_{10}Be_{22.5}$ bulk metallic glass alloy shows good bulk glass forming ability due to its high resistance to crystallization in the undercooled liquid state. DSC and XRD have been performed to confirm the amorphous structure of the master alloy. To investigate the mechanical properties and deformation behavior of the bulk metallic $Zr_{4l.2}Ti_{13.8}Cu_{12.5}Ni_{10}Be_{22.5}$ alloy, a series of compression tests has been carried out at the temperatures ranging from $351^{\circ}C$ to $461^{\circ}C$at the various initial strain rates from $2{\times}10^4s^1$ to $2{\times}10^2s^1$. Three types of nominal stress-strain curves have been identified such as linear stress-strain relationship meaning fracture at maximum stress, plastic deformation including stress overshoot and steady-state flow, plastic deformation without stress overshoot depending on the strain rate and test temperature. Also DSC analysis for the compressed specimens was carried out to investigate the change of structure, thermal stability and crystallization behavior for the various test conditions.

• International Journal of Advanced Culture Technology
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• 제7권1호
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• pp.35-42
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• 2019

This purpose of this study was to identify the meaning and structure of the experiences of women who were most stressed when they live and how they respond to stress when they were stressed.Six Female college students aged 29 years were interviewed for a total of three times until data was saturated and collected until no more data were collected. Interview data was processed through the analysis and interpretation process using the Giorgi phenomenological research method. As a result, 45 semantic units was derived, these were divided again into 12 subcomponents, and then divided into 3 categories. The stress situation of female college students was a way to escape from the stress that arises in situations that were difficult to overcome due to their inability to cope with, and that they were trying to take a walk or listen to music. A young women aged group, female college students becomes the center of the future family. Therefore, their emotional health will be more important than any other class. In conclusion, this study suggests the provision of a young women's tailed program that could help the female college students to experience the stress in the life task positively and to help the stress crisis as a positive experience of life.

• 대한간호학회지
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• 제54권1호
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• pp.106-117
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• 2024

Purpose: This study examined the effects of stress vulnerability and parental burnout on the mental health of women with early school-aged children, with a focus on the mediating role of spirituality. Methods: A survey was conducted among 171 women with early schoolaged children in Gyeonggi Province, Gangwon Province, and Seoul. Data were collected from September to December 2022 using the Korean-Symptom Check List 95, the Parental Burnout Assessment, and the Spirituality Assessment Scale. The data were analyzed using structural equation modeling with SPSS/WIN 22.0 and AMOS 20.0. Results: The study model demonstrated a good fit, explaining 40.5% of the variance in mental health through stress vulnerability, parental burnout, and spirituality. Spirituality had a significant direct impact on mental health. Additionally, participants' spirituality directly influenced their mental health, while stress vulnerability and parental burnout indirectly affected their mental health and were mediated through spirituality. Conclusion: Stress vulnerability and parental burnout are negatively associated with mental health, while spirituality partially mediates these effects. Implementing a program to promote spirituality is suggested to assist mothers in recognizing the value and meaning of parenting activities during nursing interventions for mental health.

• Journal of Biosystems Engineering
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• 제19권2호
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• pp.138-147
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• 1994

The stress relaxation and creep characteristics of fruits have usually been fit to an exponential expression based on a generalized Maxwell model and Burger's model. It is known that two to three terms in the expansion of those models are necessary to obtain a satisfactory fit to the rheological characteristics of fruits. Since four to six constants appear in the models, it is very difficult to determine their physical meaning according to the experimental conditions and levels. Therefore in order to ease the comparison of data, this study was conducted to develop the linearized rheological model of the fruit from the previous studies of stress relaxation and creep characteristics of fruits. Stress relaxation and creep characteristics were able to normalize and presented in the linear form of $t/S(t)=K_1+k_2t$ and $t/C(t)={K_1}^{\prime}+{K_2}^{\prime}t$, respectively. It was possible to compare the effects of experimental conditions and levels much easier from the linearized models developed in this study than from the generalized Maxwell model and Burger's model.