• 한국태양에너지학회:학술대회논문집
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• 2011.04a
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• pp.191-194
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• 2011

Low-grade waste heat has generally been discarded in industry due to lack of efficient recovery methods. In recent years, organic Rankine cycle(ORC) has become a field of intense research and appears as a promising technology for conversion of heat into useful work of electricity. In this work thermodynamic performance of ORC with superheating of vapor is comparatively assessed for various working fluids. Special attention is paid to the effects of system parameters such as the evaporating temperature on the characteristics of the system such as maximum possible work extraction from the given source, volumetric flow rate per 1 kW of net work and quality of the working fluid at turbine exit as well as thermal efficiency.

• Journal of the Ergonomics Society of Korea
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• v.34 no.5
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• pp.427-436
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• 2015

Objective: This study aims to analyze occupational accidents of parking lot attendants by parking lot type. Background: Recently, efforts are made to analyze accident characteristics by occupation type targeting the workers engaged in the same work. Method: This study analyzes 303 occupational accidents of parking lot attendants occurring from 2010 to 2012. Parking lots are grouped into two groups according to the work environment. One is public/ground type which comprises road side or open area parking lots and the other is building/mechanical type which comprises a multi-story parking building with connecting ramps and/or mechanical parking system. The characteristics of occupational accidents by parking lot type are analyzed. Results: Accident characteristics showed the difference between public/ground type and building/mechanical type on the size of enterprise, age, gender and work experience of the injured. Also the accident type, source of accident and parts of body affected are different between the two parking lot types. Conclusion and Application: The findings of accident characteristics according to parking lot types can be used as baseline data for establishing systemized preventative policies for occupational accidents of parking lot attendants.

• International Journal of Costume and Fashion
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• v.16 no.1
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• pp.37-53
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• 2016

This study focused on the development of a conceptual model of the turnover intention of part-time sales associates in apparel retailing. A convenience sample of 294 college students who were part-time apparel workers was used to test the model. In this proposed model, organizational support and growth opportunity indirectly influenced turnover intention through work engagement, which in turn positively affected work effort, job performance, and job satisfaction. The results also revealed a direct relationship between work/role stress and burnout, which influenced turnover intention. These findings make a unique contribution to the extant literature and enable development of relevant strategies by apparel retailers.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.43 no.2
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• pp.56-64
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• 2020

This paper is a follow up to the previous study which reveals that smartphone users are divided into three subcategories according to their usage characteristics. In this paper, these groups are called as 'general', 'entertainment', and 'work-assistant', taking into account their respective characteristics. The 'general' is a group whose smartphone usage characteristics are not focused on a specific purpose, the 'entertainment' is focused on music, internet, SNS, picture, and e-banking, and the 'work-assistant' is on work, GPS, diary. Inter-relation between the importance and satisfaction for the purchase determinants to the groups is investigated. In addition, Kano analysis of quality attributes is also performed, which includes quality type, satisfaction/dissatisfaction index, and PCSI (Potential Customer Satisfaction Improvement) index. The analysis result are as follows. Firstly, inter-relation between importance and satisfaction differs by user group. 'Internet', 'Ease of use', and 'Performance' purchase determinants are evaluated as competitive determinants in 'work-assistant' user group. Secondly Kano quality types of quality characteristics also differs by user group. 'Application' was classified as an attractive (A) types to 'entertainment' group and so on. 'Internet' 'Failure/Bug', 'Touch response rate' and 'Charging' are located in 'Nice' Region of S-PCSI Diagram and have to be considered as strategic quality characteristics. The results of this study is expected to give some helps in establishing a customer tailored quality strategy.

• Structural Engineering and Mechanics
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• v.16 no.2
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• pp.141-152
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• 2003

Characteristics of solutions of softening plasticity are discussed in this article. The localized and non-localized solutions are obtained for a three-bar truss and their stability is evaluated with the aid of the second-order work. Beyond the bifurcation point, the single stable loading path splits into several post-bifurcation paths and the second-order work exhibits several competing minima. Among the multiple post-bifurcation equilibrium states, the localized solutions correspond to the minimum points of the second-order work, while the non-localized solutions correspond to the saddles and local maximum points. To determine the real post-bifurcation path, it is proposed that the structure should follow the path corresponding to the absolute minimum point of the second-order work. The proposal is further proved equivalent to Bazant's path criterion derived on a thermodynamics basis.

• Journal of the Korean Home Economics Association
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• v.35 no.3
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• pp.139-150
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• 1997

The purpose of this study was (1) to explore the difference in parental satisfaction regarding personal/family, work, and psychological variables of employment characteristics, and (2) to investigate the most effecting variables on the parental satisfaction. For this study, the working mother with children aged under 10 year were surveyed. The results of this study were as follow; (1) There were significant differences in the parental satisfaction according to work time, job preference, income, the difficulty of work life. However, working mother's personal and family variable were not found as the related variable. Psychological variables were correlated with parental satisfaction. (2) Maternal role efficiency, dual role conflict, flexibility of work, marriage year, income, psychological stress, expanded family, durations of occupation, spouse support significantly predicted parental satisfaction. Psychological variables were important in parental satisfaction of working mothers.

• The Korean Journal of Community Living Science
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• v.20 no.2
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• pp.263-274
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• 2009

The objective of this study is to verify work satisfaction of school food-service employee, of their job characteristics. Subjects were comprised 9 elementary schools, 11 middle schools, and 3 high schools in Ansan city. Data were analyzed 203 questionnaires for frequency, means, one-way ANOVA, $Scheff{\acute{e}}$ test, t-test, and Pearson correlation using SPSS PC Package. Most of the respondents were high school graduate(91.1%), under one million won salary(41.9%), and non license holder(60.6%). Working conditions were part-time job(41.9%), unlimited contractors(51.2%), and 3-5 years of working experience(21.7%). Measure of overall job satisfaction by Likert-type 5 scale, satisfaction of work operation attitude was 3.55 points and work characteristic duty of 4.32 points. The certificate qualified and elementary school's working posture were more satisfied their work attitude than other groups(p<0.05). Salary satisfaction score showed 2.64 points, but the work esteem satisfaction showed 3.34 points. The factor of working circumstance and potentiality satisfaction was only 2.61 points, but interpersonal connection and communication satisfaction was 3.50 points. Between job satisfactions factors, they were highly correlated with each other. The pride and characteristic duty of the work showed the strongest correlated(p<0.001). The satisfaction score of work operation attitude were significantly correlated with characteristic duty(p<0.001), work esteem, interpersonal relationships and communication(p<0.01). With this results, work satisfaction of food service employees showed a relatively high to perform a job task characteristics and work attitudes. However, the working environment and growth in salaries satisfaction were low. A set of duties must be paid according to the labor intensity. As removing the disturbing factors, the improvement in the quality of the feed will be able to expect substantial effects.

• The Journal of the Korea Contents Association
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• v.16 no.11
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• pp.264-270
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• 2016

This study examined how the police officers use their annual leaves. While Korean police officers have burdens of heavy workload exceeding their regular office hours, they are passive to get leaves to keep in shape from long hours of work, to maintain the appropriate level of work productivity, and to secure time for leisure and cultural activities. It appeared that most of the police officers surveyed haven't used their annual leaves for less than half of the days designated by law. It also appeared tat female officers used more leaves than male officers, and married officers than single ones. Considering the characteristics of work environment, it showed that officers doing shift work had less days of leaves than officers in non-shift work. The reasons why the police take leaves passively lie on various factors that heavy workload, work-oriented life, work-oriented police organizational culture preceding family and so forth. Therefore, it needed to supplement the personnels to meet the needs of overwhelming workload of the police and to allocate the work properly in advance. In addition, it needed to raise the awareness of the police managers and proliferation of organizational culture to place emphasis on balance between work and family.

• Journal of the Korean Dietetic Association
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• v.2 no.1
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• pp.49-61
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• 1996

For the purpose of disclosing the relationship between job characteristics and satisfaction and organizational commitment for foodservice employees, questionnaire survey was carried out on 427 subjects of 14 general hospitals in Seoul, Korea. Questionnaire items consisted of general characteristics, organizational commitment, job satisfaction and characteristics. Data were analyzed by ANOVA, Duncan's multiple range test and Pearson correlation using SPSS PC package. The results were as follows 1. Mean score of value commitment and commitment to stay were 3.57 and 3.67. 2. There were significant differences between value commitment and age, marital status department, period and management, and between commitment to stay and experience and management. 3. Mean score of job satisfaction was the highest in co-workers(3.37) and work itself (3.37) and followed by in supervision(3.25), wage(2.43) and promotion(2.01). There were significant differences between job satisfaction for work itself and age, educational status and job department and management, between job satisfaction for wage and position, department, period and management, between job satisfaction for supervision and age, educational status and department, between job satisfaction for promotion and age, marital status, position, period, and management, between job satisfaction for co-workers and sex and educational status. 4. Mean score of job characteristics was the highest in dealing with others(4.13) and followed by in feedback(3.51), autonomy(3.29), task identify(3.07), variety(2.71) and friendship(2.47). 5. Job satisfaction for work itself, supervision and co-workers were significantly increased with increasing value commitment. Job satisfaction for work itself, supervision were significantly increased with increasing commitment to stay. Job satisfaction for promotion had negative correlation with organizational commitment in all job position. 6. Value commitment had significantly positive correlations with variety, autonomy, identity, feedback and dealing with others, and significantly negative correlation with friendship. Commitment to stay had significantly positive correlations with dealing with others, and significantly negative correlations with friendship. In all job position organizational commitment had significantly negative correlations with friendship.

• 한국전산유체공학회:학술대회논문집
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• 2011.05a
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• pp.579-586
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• 2011

During a reactor normal operation, a primary coolant was designed to remove the fission reaction heat of the reactor. When one pump is failure and the other pump shall supply the cooling water to cool the reduced power, it is necessary to estimate how much flow will be supplied to cool the reactor. We carried a flow net work analysis for two parallel pumping system as based on the piping net work of the primary cooling system in HANARO. As result, it is estimated that the flow of one pump increased than the rated flow of the pump below the cavitation critical flow.