• Journal of Mechanical Science and Technology
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• v.15 no.6
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• pp.685-692
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• 2001

This paper reports on the mixed lubrication characteristics between the cam and the tappet contact surface of direct acting type valve train systems. First, the dynamic characteristics are solved by using the lumped mass method to determine the load conditions at the contact point. Then, the minimum oil film thickness is calculated with consideration of elastohydrodynamic line contact theory and the friction force is obtained by using the mixed lubrication model which separates the hydrodynamic and the boundary friction. Finally, the average surface temperatures are calculated by using the flash temperature theory. The results show that, there are some peaks in the friction force due to the asperity contact friction, and flash temperature at the position of minimum oil film thickness. It is thought that there is a relationship between the surface temperature and cam surface wear, and therefore, the analysis on the worn cam profile has been performed.

• Journal of the Society of Naval Architects of Korea
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• v.28 no.1
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• pp.27-37
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• 1991

In this paper the nonlinear free surface flows for an axisymmetric submerged body oscillating beneath the free surface are solved and the forces acting on the body are calculated. A boundary integral method is applied to solve the axisymmetric boundary value problem and the Runge-Kutta 4-th order method is used for the time stepping of the free surface location. The nonlinear forces acting on the axisymmetric body are computed and compared with published results.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.40 no.2
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• pp.165-170
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• 2012

This paper contains the test method to obtain aerodynamic hinge moments acting on the control surface of air vehicle wing. During the flight, hinge moments make difference between actual control surface angle and control angle which is measured by sensor of actuator. The hinge moments can be obtained by using this difference. Static ground load test and calibration test were conducted to obtain torsional stiffness of control surface actuation system. This results are used to calculate hinge moments. In addition, the mechanical errors of actuation system such as slip angle of mounting point and backlash could be estimated. Using flight test results, this experimental measurement method of hinge moment acting on control surface is conducted. The results of this method are similar to those of numerical simulation method, and the validity of this method is proved.

• Korean Journal of Occupational Health Nursing
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• v.20 no.3
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• pp.308-318
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• 2011

Purpose: This study was conducted to identify the level of emotional labor, social support, and depressive symptoms of nurses, and the relationships among them. Methods: The data were collected from 314 nurses. Surface and deep-acting scales of the Emotional Labor Scale (ELS), the personal resource questionnaire, the organizational support scale, and the Korean version of the Center for Epidemiologic Studies Rating Scale for Depression (CES-D) were used. Collected data were analyzed by descriptive statistics, t-test, ANOVA, and Scheffe test. Results: Fifty six percent of total subjects had mild or major depressive symptoms. As the level of surface-acting of ELS was higher, so was the level of depressive symptoms, while as the level of individual and organizational support was higher, the level of depressive symptoms was lower. Conclusion: It is necessary to provide organizational-level support and to manage surface-acting in order to prevent the nurses' depressive symptoms. In particular, for the nurses who show relatively higher level of depressive symptoms; who are in 20s and have short employed years or not married, it is urgently required to be provided depressive symptoms management programs that targeted for those nurses.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2001.04a
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• pp.1052-1055
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• 2001

In micro-drilling of brittle materials including glass, cracks occur at the exit surface. In drilling glass, the main type of crack is cone crack. Cone crack is generated by thrust force acting at the bottom surface of the workpiece. Cone crack size could be reduced by changing cutting conditions, but cone crack still existed. Two methods were proposed to prevent crack formation and perfect hole shapes were obtained. One method is attaching two glass plates with water and the other method is constraining two glass plates. The proposed methods eliminated tensile stress acting on the exit surface of glass and prevented crack propagation.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1996.06c
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• pp.369-378
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• 1996

A Lugged steel wheel was operated with two kinds of travel reduction on a sandy clay. " Small -sized transucers of the three-surfaced lug type " were installed to the wheel for the measurement of normal and tangential forces acting on a trailing lug side, lug face and a leading lug side separately . The external results acting on each surface were calculated from those measured forces. This results proved qualitatively that the relationships between external forces and lug surfaces obtained from mathematical analyses were external forces and lug surfaces obtained from mathematical analyses were correct. The traction, the motion resistance and the dynamic load were changing at the three lug surface under various operating conditions . Therefore, total analyses of three surface were indispensable to discuss the performance of the wheel lug.

• Culinary science and hospitality research
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• v.22 no.7
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• pp.158-172
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• 2016

This study engaged food-service industry workers in Busan (casual dining restaurants and buffets) to investigate the moderating effect of job satisfaction on the influence of emotional labor on turnover intention and job burnout. To accomplish the goal of this study, the statistical programs SPSS 21.0 and AMOS 21.0 were employed for frequency analysis, factor analysis, reliability, and confirmatory factor analysis of responses from f 278 respondents. An examination was conducted to prove the hypothesis based on a structural equation model. There are two sub factors of emotional labor, surface acting and deep acting. According to the result of this study, surface acting has a positive influence (+) on job burnout (exhaustion) while deep acting has a negative influence(-). In addition, job burnout showed a positive influence (+) on turnover intention. It has been revealed that job satisfaction has a moderating effect on the path from deep acting to job burnout. Having considered that job burnout of food-service workers in Busan was related to deep acting, one of sub factors of emotional labors, promoting deep acting appears to be the way of reducing both job burnout and the number of people with turnover intention. Therefore, it is necessary for restaurant owners and CEOs to implement employee training and improve employee benefits in order to promote the deep acting of their employees.

• Journal of East-West Nursing Research
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• v.24 no.1
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• pp.20-27
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• 2018

Purpose: This study was conducted to investigate nursing professionalism, emotional labor (surface acting, deep acting), empathic concern, and customer orientation, and identify factors contributing to customer orientation among clinical nurses. Methods: The participants in this study were 151 clinical nurses at the three general hospitals. Data were collected using self-administered questionnaires. Data were analyzed using descriptive statistics, independent t-test, one-way ANOVA, Pearson correlation coefficient, and multiple regression. Results: The significant predictors of customer orientation among clinical nurses were empathic concern (${\beta}=.43$, p<.001), nursing professionalism (${\beta}=.29$, p<.001), nursing career (${\beta}=.16$, p=.007), and deep acting (${\beta}=.14$, p=.021). Theses variables explained 47.6% of the variance of customer orientation. Empathic concern was the most influential variable. Conclusion: The results suggest that it is crucial to improve deep acting, empathic concern and nursing professionalism for increasing clinical nurses' customer orientation. Management-level leaders in the hospitals should develop strategies of promoting nursing professionalism, deep acting and empathic concern to improve customer orientation.

• Journal of Digital Convergence
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• v.14 no.2
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• pp.449-457
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• 2016

The purpose of this study was empirically to reveal the effects of emotional labor and job burnout of the ski resort workers on service level. For the study, a survey of 215 people working in domestic ski resorts was conducted. Emotional labor was composed of two sub-factors: surface acting and deep acting. Service level was composed of three sub-factors: tangibles, responsiveness, endeavor. The following results were obtained by confirmatory factor analysis, reliability analysis, correlation analysis, regression analysis. First, in emotional labor which ski resort worker perceived, surface acting had a positive effect on job burnout, while deep acting had a negative effect on it. Second, surface acting had a positive effect on tangibles and responsiveness of service level and deep acting had a positive effect on tangibles, responsiveness and endeavor of service level. Third, job burnout which ski resort worker perceived had a negative effect on tangibles, responsiveness and endeavor of service level. This study suggested that implications and limitations of the relationship between outcomes and emotional labor which people working at sport organizations such as a ski resort have experienced.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.7
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• pp.3030-3038
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• 2011

This study was conducted as descriptive research to examine the relations among beauty business workers' professional identity, emotional labor and depression, to analyze factors that influence their depression, and to provide basic information necessary to develop interventions for beauty business workers' depression. The subjects of this study were 158 beauty business workers sampled from 25 beauty shops in Seoul. Data were collected using a structured questionnaire during the period from April 12 to May 13, 2011. From the collected data were obtained real numbers, percentages, and the means and standard deviations of professional identity, emotional labor and depression using the SPSS 16.0 Program. In addition, multiple regression analysis was performed to determine the correlations among the variables and to identify factors influencing the beauty business workers' depression. In the results of multiple regression analysis on factors that influence the subjects' depression, factors found to explain their depression were autonomy among the sub factors of professional identity, and the diversity of emotional expressions and surface acting among the sub factors of emotional labor, and these factors explained 23.6% of their depression. The subjects' professional identity was in a positive correlation with the frequency of emotional expressions and deep acting among the sub factors of emotional labor, and in a negative correlation with surface acting and depression. The Frequency of emotional expression and the diversity of emotional expressions which the sub factors of emotional labor were in a negative correlation with depression and in a positive correlation with surface acting and depression. In order to relieve beauty business workers from their depression based on these results, there should be education or programs for establishing beauty business workers' professional identity and program for increasing of emotional expressions and decreasing of surface acting.