• 한국자동차공학회논문집
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• 제15권5호
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• pp.133-138
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• 2007

Surface pitting is a major failure mode for gears. The contact fatigue life analysis of transmission gear considering running-in process is presented in this paper. Surface roughness change of rolling test is used in a life analysis. Contact stresses are obtained by contact analysis of a semi-infinite solid based on the use of influence functions; the subsurface stress field is obtained using rectangular patch solutions. Mesoscopic multiaxial fatigue criterion which can yield satisfactory results for non-proportional loading is then applied to predict fatigue damage. Suitable counting method and damage rule were used to calculate the fatigue life of random loading caused by rough surface. The life analysis considering running-in is in good agreement with the experimental results.

• Human Ecology Research
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• 제53권3호
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• pp.331-339
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• 2015

This study investigates the effects of parental abuse and neglect on school life adjustment mediated by self-esteem in adolescents. Participants consisted of 2,259 middle school students from the Korean Children and Youth Panel Study 2012. Secondary questionnaire data on parental abuse and neglect, self-esteem, and school life adjustment are used for this study. Data were analyzed using descriptive analysis, Cronbach's a, Pearson's correlation analysis and multiple regression analysis. Baron and Kenny's method determined the mediation effect. SPSS ver 18.0 was adopted. The results were as follows. First, parental abuse and neglect were negatively correlated with the adolescent school life adjustment; however self-esteem was positively correlated with adolescent school life adjustment. Second, the results of the regression analysis revealed that adolescent school life adjustment was influenced both directly and indirectly; parental abuse had a direct effect on adolescents' school life adjustment and also had an indirect effect on mediated by self-esteem. Parental neglect had a direct effect on adolescent school life adjustment and had an indirect effect on adolescent school life adjustment mediated by self-esteem. The results indicated that self-esteem plays a crucial variable in the relationship of parental abuse and the school life adjustment. Also, self-esteem plays a crucial variable in the relationship between parental neglect and school life adjustment.

• 한국정보시스템학회지:정보시스템연구
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• 제28권2호
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• pp.153-179
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• 2019

Purpose This study collects the issues about work-life balance in Korea and United States and suggests the specific plans for work-life balance by the comparison and analysis. The objective of this study is to contribute to the improvement of people's life quality by understanding the concept of work-life balance that has become the issue recently and offering the detailed plans to be considered in respect of individual, corporate and governmental level for society of work-life balance. Design/methodology/approach This study collects work-life balance related issues through recruit sites in Korea and United States, compares and analyzes the collected data from the results of three text mining techniques such as LDA topic modeling, term frequency analysis and keyword extraction analysis. Findings According to the text mining results, this study shows that it is important to build corporate culture that support work-life balance in free organizational atmosphere especially in Korea. It also appears that there are the differences against whether work-life balance can be achieved and recognition and satisfaction about work-life balance along type of company or sort of working. In case of United States, it shows that it is important for them to work more efficiently by raising teamwork level among team members who work together as well as the role of the leaders who lead the teams in the organization. It is also significant for the company to provide their employees with the opportunity of education and training that enables them to improve their individual capability or skill. Furthermore, it suggests the roles of individuals, company and government and specific plans based on the analysis of text mining results in both countries.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.350-355
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• 2008

A Rubber mount is widely used for mechanical parts or engineering materials. Especially, it plays an important role in reducing mechanical vibration due to cyclic loading. But, rubber mount is damaged due to the cyclic loading and resonance. Therefore, it is necessary to investigate evaluation of fatigue life considering vibration characteristics for rubber. In this study, a vibration fatigue analysis was performed and based on Power Spectral Density(PSD) and the stress-life curve and a result of frequency response analysis in the finite element method. The measured load history in experiment was transformed to PSD curve. The stress-life curve was obtained by nonlinear static analysis and fatigue test. In addition, frequency response analysis was conducted for mechanical part. In order to evaluate fatigue life of rubber mount, vibration fatigue test was conducted at the constant acceleration-level as well. Fatigue life was determined when the load capacity is reduced to 60% of its initial value. As a result, predicted fatigue life of rubber mount agreed fairly well with the experimental fatigue life.

• 한국의상디자인학회지
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• 제23권4호
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• pp.81-93
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• 2021

This study attempted to investigate the mediating effects of self-efficacy in the influence of appearance management behavior and life satisfaction among middle-aged women. For this, a questionnaire survey was performed among 153 women aged 40-59 living in Seoul and Gyeonggi-do. The collected data were analyzed by frequency analysis, cross-tabulation analysis, t-test, ANOVA, Duncan's test, reliability analysis, and correlation analysis, using SPSS 25.0. To examine mediating effects, SPSS Process MACRO #4 was borrowed, and the results found the following: 1) A positive correlation with statistical significance was observed among appearance management behavior, self-efficacy, and life satisfaction. 2) According to the analysis of appearance management behavior, self-efficacy and life satisfaction by demographic characteristics, some differences were found. 3) The mediating effects of self-efficacy in appearance management behavior and the life satisfaction relationship was confirmed. The above results show that middle-aged women experience an increase in self-efficacy through appearance management behavior and improvements in their life satisfaction through such self-efficacy, not just enhancing life satisfaction through appearance management behavior. In other words, appearance management increases life satisfaction through an ego-discovery process.

• 대한가정학회지
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• 제35권3호
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• pp.151-169
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• 1997

The purpose of this study was to analyze contributing factors to elder's life problem and their life planning. The sample in this study consisted of 556 elderly husband and wives over 55 years old loving in Seoul, Daejeon, Jeonju and Daegu. Statistics employed for the analysis were frequencies, means, and multiple regression analysis. The results could be summarized as follows. Elderly's life problem and planning were negatively related in economic and leisure domain. And family relationship and self-esteem had significant effects on the perception of life problem, while hoe ownership, total income and total asset had not effect on perception of life problem of elderly. Also, family relationship, self-esteem and locus of control had effect on life planning of elderly. These findings pointed that psychological variables as family relationship and self-esteem play a more important role than economic variables in life of elderly.

• 수산해양교육연구
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• 제27권2호
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• pp.345-352
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• 2015

The purpose of this study was to identify the difference of school life satisfaction of middle school students according to soccer school sports club participation from a practical view. The results were follows; According to the results of analysis of the school life satisfaction between participating in soccer school sports club students and non participating student, significant differences(p<.001) were found in general school life, fellowship, teachers, learning, school rules and school events. As the results of analysis of the school life satisfaction according to the participating period, no significant differences were shown in general school life, fellowship, teachers, learning, school rules and school events. As the results of analysis of the school life satisfaction according to the participating motivation, no significant differences were found in general school life, fellowship, learning, school rules and school events, but significant difference(p<.05) was found in teachers. As the result of analysis of the school life satisfaction according to the engagement time, no significant differences were shown in general school life, teachers, learning, school rules and school events, but significant difference(p<.001) was found in fellowship.

• 한국주거학회논문집
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• 제11권1호
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• pp.25-36
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• 2000

The purpose of this study was to analysis housing life styles of apartment dwellers by alteration in Ulsan, got hold of the influencing variables of housing life styles and indicated source materials about the plan of alteration of apartment dwellers. As a methodology for this study, questionnaire survey were used. The number of 228 cases were analyzed through SPSS PC+. For the analysis of the data, such techniques were used as reliability analysis, frequence analysis, factor analysis, correlation analysis, and multiple regression analysis.The major findings of this study were as followings: 1. Housing life styles of apartment dwellers by alteration in Ulsan identified five factors. In order of decreasing importance, these factors included: i)practicality, ii)ornament, iii)the faculty of space, iv) actuality, and v) spending habits. 2. The size of a family, wife's education, income, cost of alteration, and the area of installment sale were the most significant factors that influenced housing life styles of apartment dwellers by alteration in Ulsan.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.574-580
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• 2005

Recently, the number of bridges and tunnels in railway is increasing due to the super high-speedy of train. Also, because of successively accidents of civil structures such as bridges and dams, the importance of maintenance become influential. The purpose of this study is to show the probabilistic life cycle cost analysis technique(PLCC) of the railroad bridge as pubic-infrastructures, and reasonably to indicate the economy in life cycle cost(LCC) through a case study. Rationally for life cycle cost analysis, the data gathered through many materials considered the uncertainty such as covariance. As a result, it is indicated that prestressed concrete bridge is pretty more cost-effective during life-cycle than preflex as well as steel box bridge. In future, if the construction of database and maintenance materials for railroad infrastructure is actualized, the life cycle cost analysis for railroad can be conducted easily and practically.

• 대한간호학회지
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• 제33권3호
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• pp.414-424
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• 2003

Purpose: The purpose of this study was to develop elderly meaning in life scale with high validity and reliability. Method: The process of development of this scale were as follows. A conceptual framework composed of 4 phases of meaning in life of elderly was identified based on the literature review and interviews with elderlies and discussion with experts in meaning in life. Total 62 items, 4-points scale were developed. Through reliability testing, factor analysis, 40 preliminary items were selected. By means of internal consistency of 40 items, 2 items whose inner-items correlation coefficient was below .30 were deleted. Through factor analysis 1 item whose factor loading was below .30 was deleted. Finally 37 items were remained. To verify 37 items, factor analysis, reliability testing, LISEREL were done. Data were collected from 320 elderly subjects in Busan-KyungNam and Jeonla Province from May to June in 2002. SPSS WIN. 10.0 Program was used. Result: The result of factor analysis of 37 items, 8 factors were extracted. These factors were labeled as ‘self- awareness and self-acceptance’, ‘contentedness with life’, ‘purpose in life’, ‘love in family’, ‘role awareness’, ‘futuristic aspiration’, ‘commitment’, and ‘experience of love’. These factors included 4 phases of the meaning in life. Cronbach's Alpha of 37 items was .908 and correlation coefficient of PIL was .75. Conclusion: The researchers recommend the follows: The explorative study on the variables related to meaning in life are needed for criterion validity of this scale. The studies on meaning in life of different age groups, subjects are needed for reverification.