• Journal of Advanced Marine Engineering and Technology
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• 제29권5호
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• pp.571-578
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• 2005

Stresses of main stop valve and control valve casings for the steam turbines of power plants are analyzed by the finite element method. The stress intensity is obtained to check the results on the basis of the design criteria of ASME boiler and pressure vessel code. To verify accuracy of the finite element analysis. analyzed stresses are compared with those measured during the hydrostatic pressure test. Stress category drawings. which play an important role in evaluating casting defects, are produced from the analysis results, and important points in casting of the valve casings are discussed in terms of the stress category.

• 인지과학
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• 제14권2호
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• pp.27-35
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• 2003

The present study, focusing on the stress-shift constructions, examines the tendency of young children to give wrong wide scope interpretation in language acquisition and questions the validity of the guess pattern hypothesis argued by Grodzinsky & Reinhart (1993). According to the hypothesis, children know that they have to construct a reference-set, keep two representations in working memory, and check whether the interpretation needed in the given context justifies selection of competing reference sets, but their working memory is not big enough to hold the materials needed to complete the execution of this task. Hence they give up and resort to a guess. 1 carried out an experiment of 16 Korean children aged 3;9 to 6;2 to find out whether children have more difficulty in the interpretation of stress-shift constructions than of constructions with a nuclear stress, and therefore perform the interpretation of the former by guessing. Assuming that the tendency is caused by a deficiency in contextual computation rather than reference set computation, I try to explain it in terms of pragmatic considerations.

• Structural Engineering and Mechanics
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• 제8권1호
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• pp.103-118
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• 1999

The structural integrity of the reactor pressure vessel under pressurized thermal shock (PTS) is evaluated in this study. For given material properties and transient histories such as temperature and pressure, the stress distribution is found and stress intensity factors are obtained for a wide range of crack sizes. The stress intensity factors are compared with the fracture toughness to check if cracking is expected to occur during the transient. A round robin problem of the PTS during a small break loss of coolant transient has been analyzed as a part of the international comparative assessment study, and the evaluation results are discussed. The maximum allowable nil-ductility transition temperatures are determined for various crack sizes.

• International Journal of Aerospace System Engineering
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• 제2권2호
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• pp.54-57
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• 2015

The purpose of this paper is to provide the method of conventional stress analysis for a pressurized hydraulic cylinder with internal thread undercut. In the case of hydraulic cylinder with thread undercut, several loads and stresses occur during operating. So, the thread undercut can be most critical section has to be considered in detail for strength check. In this paper, the conventional stress analysis method at internal thread undercut of hydraulic cylinder based on Kowalski's formula is introduced. The method is verified by comparing to FEM analysis results using ANSYS.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1999년도 춘계학술발표회요약집
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• pp.433-433
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• 1999

• 정신신체의학
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• 제10권1호
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• pp.48-54
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• 2002

연구목적: 종합 병원 건강 증진 센터를 내원한 일반 성인들을 대상으로 생활 스트레스, 신체적 및 정신적 증상, 그리고 신체 이학적 지표들을 측정하여 스트레스와의 관련성을 알아보고자 하였다. 방법: 2000년 7 월부터 12월까지 종합병원 건강증진센터에 내원한 성인 남녀 중 186명을 대상으로 하여 생활 스트레스 측정도구, 간이정선진단검사, 건강 검진 문진표를 사용하여 대상들이 지각하는 생활스트레스와 신체적 및 정신적 증상을 조사하였으며, 건강 진단에 통상적으로 시행되는 검사 중 스트레스와 관련이 있다고 생각되어지는 신체 이학적 지표를 선정하여 분석하였다. 전체 연구 대상을 생활스트레스지각의 정도에 따라 스트레스 낮은 군과 높은 군으로 나누어 두 군간에 연구변인들의 유의미한 차이가 있는지 분석하였다. 결과: 스트레스가 낮은 군과 높은 군 사이에 간이정신진단검사의 모든 소항목 점수들은 모두 유의미한 분포의 차이를 보였으며, 주관적인 신체증상에서도 불안, 우울 증상과 그와 관련된 자율신경계 증상들이 유의미하게 분포함을 알 수 있었다 그러나 성인병의 지표라 볼 수 있는 신체이학적 검사자료에서는 두 군간에 유의미한 차이가 없었다. 결론: 생활 스트레스는 일반 성인남녀에서 정신적 증상 및 신체생리 증상들을 야기할 수 있지만, 고혈압, 당뇨병, 고지혈증, 심장병 등의 스트레스성 성인질환으로 진행되기까지는 스트레스가 상당기간 지속되어야 함을 시사하였다.

• 기본간호학회지
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• 제16권2호
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• pp.171-180
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• 2009

Purpose: This study was done to examine the frequency of irritable bowel syndrome (IBS), entrance examination stress, mental health, and quality of life among adolescent women. Methods: A survey conducted to collect data from 925 adolescent women in Gyeonggi Province. The measurements included the Rome III criteria (to diagnose IBS), the entrance examination stress scale (to evaluate stress), symptom check list90R (SCL-90R to evaluate mental health), and World Health Organization Quality of Life Abbreviated Version (WHOQOL-BREF to evaluate quality of life). Frequency, $X^2$-tests, t-test, and analysis of variance (ANOVA) with the SPSS 16.0 program were used to analyze the data. Results: The frequency of IBS in the women was 22.8%. One hundred thirty eight women (65.4%) had the mixed constipation and diarrhea subtype of IBS. Compared to the women without IBS, those with IBS reported significantly higher scores on entrance examination stress scale, SCL-90R, all subscales of SCL-90R, and lower scores on WOLQOL-BREF. Conclusion: Nursing interventions targeting adolescent women with IBS should be developed in order to alleviate the associated stress and mental health and to promote quality of life.

• Journal of Preventive Medicine and Public Health
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• 제49권6호
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• pp.376-385
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• 2016

Objectives: This study was conducted to investigate the relationships among job stress, job satisfaction, and mental health in marine officers. Methods: The researchers gathered data on marine officers working at a harbor in Chungcheong Province, South Korea, using a self-reported questionnaire. Mental health was measured by the Symptom Checklist-90-Revision (SCL-90-R), and general characteristics including socioeconomic factors, job stress, and job satisfaction were measured by structured questionnaires. Multiple regression analysis was performed to investigate the relationships among job stress, job satisfaction, and mental health status according to the symptom dimensions of the SCL-90-R. Results: Among the marine officers, obsessive-compulsive behavior, depression, and somatization were the most problematic symptoms. Those who reported poor health, low job satisfaction, and high job stress had a higher prevalence of psychoticism, somatization, depression, anxiety, and phobic anxiety. Conclusions: An occupational health system should be introduced that would regularly check the mental health of marine officers in charge of ships and sailors, in order to help reduce their stress levels, enhance their job satisfaction, and thereby improve their mental health.

• 성인간호학회지
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• 제20권5호
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• pp.685-696
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• 2008

Purpose: This study was performed to examine the frequency of irritable bowel syndrome(IBS), perceived stress, and mental health among community-dwelling women. Methods: This study conducted a survey to collect data on 869 women in Seoul and Gyeonggi-do. The measurements included the Rome III criteria(to diagnose IBS), the Global Assessment Recent Stress(GARS scale to evaluate perceived stress), and symptom check list 90R(SCL-90R to evaluate psychological distress). Data were analyzed using SPSS 15.0 program by frequency, $x^2$-tests, t-test, and analysis of variance(ANOVA). Results: The frequency of IBS in women was 15.1%. Eighty-six women(65.6%) had mixed constipation and diarrhea subtype of IBS. Compared to the women without IBS, those with IBS reported significantly higher scores on GARS, all subscales of GARS, SCL-90R, all subscales of SCL-90R, and the global severity index(GSI). No significant differences were observed among stress, mental health, and the IBS subtypes. Conclusion: Nursing interventions targeting women with IBS should be developed in order to reduce the associated stress and psychological distress.

• 한국IT서비스학회지
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• 제15권1호
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• pp.255-268
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• 2016

The purpose of this paper is to propose a notification service for preventing unexpected accidents which will be occurred by enlisted men's stress in Korean Army. For this purpose we first evaluate the enlisted men's stress with reliable evaluation tools through survey. A representative sample size of about 1,500 enlisted men from all seven unit types was selected and surveyed considering types of unit, ranks, and regional characteristics. In the second, we analyse the results of level of stresses and stress reactions to distinguish high potential enlisted men who will happen to accident. Through the second step, we know enlisted men's stress reactions are different depending their unit types. Therefore the basic information about their stresses will be judged respectively according to their unit types. In the final step, we propose a notification service that offer the information about high potential enlisted men who will happen to accident to their managers rapidly through military Intranet and information systems. Their managers will get the previous information about occurrence of unexpected accidents and have time to check various things before they are occurred. We hope the proposed service contributes to prevent unexpected accidents and reduce the effort of military managers. Furthermore this paper offers several recommendations to apply the proposed service to Korean Army.