• 한국생산제조학회지
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• 제25권4호
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• pp.245-252
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• 2016

Girth gears are applied in the mining, cement, and mineral processing industries and used in various types of horizontal mills, rotary dryers and kilns, and other heavy-gear ring applications. The large ring gears are normally fitted outside mills or kilns to provide the primary rotational drive. Recently, an external pinwheel gear set (e-PGS) was introduced to overcome manufacturing problems associated with girth gears. e-PGS is also suitable for low-speed, heavy-duty mechanical transmission and dusty and poor-lubrication conditions. This paper first presents a new profile modification of root relief for the e-PGS cam pinion. We then investigate load-stress factors to estimate the surface fatigue life by varying the shape design parameters. The results show that the contact fatigue life of an e-PGS can be extended significantly by increasing the profile shift coefficient. However, support bearing life of the pinwheel depends more on the contact force distribution than the profile shift coefficient.

• 한국치위생학회지
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• 제16권3호
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• pp.435-446
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• 2016

Objectives: The purpose of the this study is to investigate parenting stress of married dental hygienists having preschool and school aged children. Methods: A self-reported questionnaire was completed by 242 married dental hygienists from September to December, 2015 via e-mail and ordinary mail. The questionnaire consisted of demographics, job-related characteristics, family life satisfaction, and parenting stress. The data were analyzed using Stata 13.0 program. Results: As for job-related characteristics, 36.6% of the subjects answered 'not possible' in work hour flexibility. The reasons why family-work balance is difficult were 'parenting and education(58.7%)' and 'burden of family-work balance(32.4%)'. Family life satisfaction was 3.03, and parenting stress was 2.41. Parenting stress gets higher if their children are younger, monthly income is lower, and mother/father's age are lower. And parenting stress becomes higher if their career as dental hygienists is less, they are contract worker, and frequency to change jobs is higher. Concerning the reason why work-family balance is difficult, parenting stress is found to be high when they choose 'parenting and education', 'burdens of work-family balance', and 'relationship in workplace'. Family life satisfaction reduced parenting stress. According to the results of multiple linear regression analysis, frequency to change job influences parenting stress. Conclusions: Parenting stress increases turnover and career interruption of married dental hygienists. It is hard to improve work environment without policy support. It will be necessary to establish policy for employed mothers and create a work atmosphere where the policy can be utilized without difficulty.

• 성인간호학회지
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• 제22권2호
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• pp.121-129
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• 2010

Purpose: In numerous studies, MBSR programs have been shown to reduce stress and improve health-related QOL. Although MBSR programs have been shown to be beneficial, its effects have not been well-determined among Korean populations in clinical nursing practice. The purpose of this review was to describe the effects of MBSR on stress and health-related QOL so that the potential benefits of this intervention may be evaluated for wider application in Korea. Methods: Articles published in peer-reviewed journals in the English or Korean language up to 2009 were reviewed; 14 articles met the inclusion criteria for this review and there were no Korean papers. Results: MBSR groups were found to have significantly reduced stress outcomes relative to non-MBSR groups in 6 of 11 studies. In regards to health-related QOL, participants of the MBSR programs had increased scores after MBSR intervention relative to control groups in 5 of 7 studies. Conclusion: MBSR programs was effective in decreasing stress and increased the health-related QOL in the majority of studies reviewed. MBSR merits study in Korean patients to determine whether similar salutary patient outcomes may be obtained.

• 생명과학회지
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• 제26권4호
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• pp.490-495
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• 2016

Brefeldin A (BFA)는 Eupenicillium brefeldianum에서 분리한 lactone계열의 항생제이며 ER에서 Golgi로 단백질 이송/전달을 억제히는 기능이 있다. 따라서 BFA를 세포에 처리 시 Golgi 기능 장애와 ER에서 단백질의 폴딩/조립의 문제로 인하여 ER에 기능 장애가 발생하는데 이를 소포체 스트레스(ER stress)라고 한다. 본 연구에서는 정상 astrocyte 세포와 C6 glioma 세포에서의 BFA처리에 따라 ER stress marker 단백질인 CHOP 발현 차이를 확인하였다. BFA 처리 시 CHOP 발현이 정상 astrocyte 세포에서 C6 glioma 세포에 비해 현저히 낮은 발현을 확인하였다. 하지만 CHOP mRNA 발현에서는 astrocyte 세포에서 발현 됨을 RT-PCR로 확인하였다. C6 glioma 세포와 비교하여 astrocyte 세포에서 BFA유도의 CHOP 단백질 발현이 낮은 원인은 proteasome 활성이 높음으로 기인됨을 proteasome inhibitor 실험과 proteasome 활성 측정을 통하여 확인하였다.

• 한국보건간호학회지
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• 제16권2호
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• pp.254-270
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• 2002

This descriptive correlational study was conducted to identify the variables related to a health promoting lifestyle in women student of high school. 286 students were selected by a convenience sampling method. The data were collected by self - reported questionnaires from 10 to July 13, 2002. The data were analyzed by using descriptive statistics, pearson correlation coefficient, stepwise multiple regression with SPSS program. The result of this study were as follows: 1. The average score of health promoting behavior was 2.46 of a 4 point scale. Sanitary life(3.05), interpersonal support(2.80), alcohol & smoking(2.79) Self actualization(2.76), habit of meal(2.52), rest & sleeping(2.33) regulation of meal(2.30) stress management(2.05), health responsibility(1.91) were also analyzed. 2. Health promoting lifestyle showed significant positive correlations with self-esteem (r=0.446, p<0.00l), life orientation test(r=.493, P<0.0l) and score(F=6.157, P=0.002) 3. Perceived health state showed significant correlation with alcohol & smoking subscale(r=-.134, P<0.05) of health promoting lifestyle. Self-esteem showed significant correlation with total health promoting lifestyle(r=.538, P<0.01), and showed significant correlation self-actualization subscale(r=.657, P<0.01) health responsibility subscale (r=.272, P<0.01), food regulation subscale(r=.126, P<0.05), interpersonal relationship subscale (r=.468, P<0.0l), stress management subscale(r=.349, P<0.01) sanitary life subscale (r=.282, P<0.01) sleep & rest subscale(r=.123, P<0.05). Life orientation test showed significant correlation with total health promoting lifestyle(r=.493, p<0.01), self­actualization subscale(r=.643, p<0.01) health responsibility subscale(r=.192, P<0.0l), habit of meal subscale(r=.215, p<0.01), interpersonal relationship subscale(r=.423, p<0.01), stress management subscale(r=.345, p<0.01) sanitary life subscale(r=.191, p<0.01) sleep & rest subscale(r=.137, P<0.05). Stress response showed significant correlation with sleep & rest subscale(r=-.137, P<0.05) of health promoting lifestyle. 4. The combination of self-esteem. life orientation test explained $33.2\%$ of the variance in health promoting lifestyle. On the basis of the above findings. self-esteem and Life Orientation Test were identified as the variables which explained most of Pender's health promoting model. Nursing strategies enhancing self-esteem and Life Orientation Test which have a more significant effect on health promoting lifestyles should be developed.

• 한국보건간호학회지
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• 제7권2호
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• pp.89-97
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• 1993

The purpose of this study was to analyze early adolescent-family stress and family coping according to differences in general charactiristics. This study is also intended to analyze relationship between early adolescent family stress and coping. The subjects of this study consisted of (292) middle school students of the city of sokcho. The data were collected between Aug. 23, 1993 to Aug. 28, 1993. At tools of measurement, McCubbin & Patterson's 'A-FILE (Adolescent-Family Inventory of Life Events & changes)' and 'A-COPE (Adolescent Coping Orientation for Problem Experiences)' were amended and made use. For the statistical analysis of data, t-test, ANOVA, Pearson Correalation Coefficient were utilized The results were summarized as follows: 1) General characteristics influencing the level of adolescent-family stress were parents status. (p=.000) 2) General characteristics influencing coping were parent's religions. (father: p=. 003) (mother: p=.039) 3) There was a significant difference between the level of adolescent-family stress & coping. (p=.000)

• 대한금속재료학회지
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• 제49권6호
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• pp.468-473
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• 2011

Determining the residual stress during casting processes is important for evaluating the mechanical properties and strength of materials and to optimize manufacturing conditions. In this study, we propose a field data interface procedure between FDM and FEM in a 3-dimensional space for analyzing the casting process and structural analysis. The casting process was analyzed using FDM and the data of the temperature distribution were converted into a format suitable for FEM analysis to calculate the thermal stress and safety factor by tightening force. The results of the coupled analysis between FDM and FEM showed that casting residual stress is an important factor in predicting life time and evaluating durability.

• 한국산학기술학회논문지
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• 제22권2호
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• pp.221-230
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• 2021

본 연구의 목적은 직무 스트레스, 삶의 만족도, 소진, 자기자비 간의 인과적 관계를 알아보기 위한 것이다. 이를 위해 한국법무보호 복지공단에 근무하는 종사자들을 대상으로 2018년 2월에 e-mail 설문을 실시하였으며, 수집된 설문 중 성실하게 응답한 213부가 최종분석에 포함되었다. 변수들 간의 관계를 알아보기 위해 구조모형을 개발하였으며, SPSS와 AMOS를 이용하여 모형의 적합도 및 매개효과를 검증하였다. 자료수집을 위해 직무 스트레스, 삶의 만족도, 소진, 자기자비 척도가 사용되었다. 연구결과, 직무 스트레스와 삶의 만족도 관계에서 자기자비가 완전매개하며, 직무 스트레스와 소진 관계에서 자기자비가 완전매개하며, 자기자비와 소진 관계에서 삶의 만족도가 부분매개하는 것으로 나타났다. 이는 자기자비가 직무 스트레스, 삶의 만족도, 소진에 서로 유의미한 영향을 미치는 것을 의미한다. 특히, 자기자비의 완전매개 효과는 높은 직무 스트레스-낮은 자기자비-낮은 삶의 만족도- 높은 소진이라는 악순환적 관계를 종합적으로 보여준다. 연구결과를 바탕으로 교정기관 종사자들의 직무 스트레스와 소진을 낮추고 삶의 만족도를 높이기 위해 자기자비를 기반으로 하는 프로그램 개발 필요성과 향후 시사점에 대해 논의하였다.

• 한국산학기술학회논문지
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• 제19권4호
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• pp.167-177
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• 2018

본 연구의 목적은 산재환자에게 나타나는 외상후 스트레스가 삶의 질에 미치는 영향과 이들의 관계에 있어 회복탄력성의 효과를 확인하기 위한 서술적 조사연구이다. 본 연구는 2개 광역지역에 소재한 산재병원, 종합병원 및 준 종합병원에 입원중이거나 통원하고 있는 158명의 산재환자를 대상으로 이루어졌다. 자료수집은 2017년 7월 1일부터 9월30일까지 자기보고식 설문지로 이루어졌다. 자료는 SPSS 21.0을 이용하여, 기술통계, 상관분석, 위계적 회귀분석, Sobel test로 분석하였다. 연구결과, 연구대상자의 외상후 스트레스와 삶의 질, 회복탄력성은 음의 상관관계를, 삶의 질과 회복탄력성은 양의 상관관계를 보였다. 외상후 스트레스가 삶의 질에 대한 영향에서 회복탄력성의 효과를 규명하기위해 회귀분석을 실시한 결과, 외상후 스트레스와 삶의 질의 관계에서 회복탄력성은 부분 매개효과가 있었으나 조절효과는 없었다. 외상후 스트레스와 회복탄력성은 삶의 질에 45%의 설명력을 보여주었으며 이 중 외상후 스트레스는 삶의 질에 23%의 직접효과가 있었고 회복탄력성을 매개로 하여 22%의 간접효과가 있었다. 이상의 결과에 비추어 볼 때 외상후 스트레스와 회복탄력성은 삶의 질에 영향을 미치는 주요한 심리적 변수임을 알 수 있다. 따라서 산재환자의 삶의 질을 향상시키기 위해서는 이들의 외상후 스트레스를 줄여줄 뿐만 아니라 회복탄력성을 증가 시켜주는 중재가 필요할 것이다.

• Journal of Welding and Joining
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• 제29권1호
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• pp.46-51
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• 2011

TSV technology raises several reliability concerns particularly caused by thermally induced stress. In traditional package, the thermo-mechanical failure mostly occurs as a result of the damage in the solder joint. In TSV technology, however, the driving failure may be TSV interconnects. In this study, the thermomechanical reliability of TSV technology is investigated using finite element method. Thermal stress and thermal fatigue phenomenon caused by repetitive temperature cycling are analyzed, and possible failure locations are discussed. In particular, the effects of via size, via pitch and bonding pad on thermo-mechanical reliability are investigated. The plastic strain generally increases with via size increases. Therefore, expected thermal fatigue life also increase as the via size decreases. However, the small via shows the higher von Mises stress. This means that smaller vias are not always safe despite their longer life expectancy. Therefore careful design consideration of via size and pitch is required for reliability improvement. Also the bonding pad design is important for enhancing the reliability of TSV structure.