• The Journal of the Korea Contents Association
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• v.16 no.7
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• pp.100-111
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• 2016

This study analyzes targeting 584 senior citizens aged 65 and over in Gyeongsangnam-do to verify a mediated control effect of optimism and family support in stress and successful aging of the aged. Using SPSS Macro Way suggested by Preacher and Hayes. A study model is verified through a route model, and the verification of the study model is conducted in three stages. The first stage analyzes whether a control variable has a control effect in a relationship between predictor variable and standard variable, and the second stage confirms a relationship between predictor variable and mediated variable. In addition, the third stage confirms a mediated control effect. An analytical result is summarized as follows. First, as a result to verify a mediated effect between stress and successful aging, and optimism, it is confirmed that it supports a partially-mediated model. Second, as a result to verify a control effect of optimism and family support of successful aging, it is confirmed that everything has a control effect. Third, as a result to verify a mediated control effect of stress, optimism, successful aging, and family support, there is a mediated control effect. Based on these study results, practical undertone and future task are suggested, and a way to improve family support is presented for successful aging in advanced age.

• Earthquakes and Structures
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• v.26 no.1
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• pp.31-48
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• 2024

In order to get a better understanding of seismic performance of exterior beam-column joint, reciprocating loading tests with variable loading speeds or axial forces were carried out. The main findings indicate that only few cracks exist on the surface of the joint core area, while the plastic hinge region at the beam end is seriously damaged. The damage of the specimen is more serious with the increase of the upper limit of variable axial force. The deflection ductility coefficient of specimen decreases to various degrees after the upper limit of variable axial force increases. In addition, the higher the loading speed is, the lower the deflection ductility coefficient of the specimen is. The stiffness of the specimen decreases as the upper limit of variable axial force or the loading speed increase. Compared to the influence of variable axial force, the influence of the loading speed on the stiffness degradation of the specimen is more obvious. The cumulative energy dissipation and the equivalent viscous damping coefficient of specimen decrease with the increase of loading speed. The influence of variable axial force on the energy dissipation of specimen varies under different loading speeds. Based on the truss model, the biaxial stress criterion, the Rankine criterion, the Kent-Scott-Park model, the equivalent theorem of shearing stress, the softened strut-and-tie model, the controlled slip theory and the proposed equations, a calculation method for the shear capacity is proposed with satisfactory prediction results.

• Journal of Power System Engineering
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• v.12 no.2
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• pp.41-47
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• 2008

This article deals with the stress analysis of the friction drive, which transmits the power via the rolling resistance on the contract area between the two rotating bodies. On the contact area, friction drives are normally involved with shear stress due to the transmitted force, as well as normal stress. Thus the stress analysis including the shear stress is necessary for the design of the friction drive. Hertzian results can be used to estimate the normal stress distribution and elastic deflection of the contact area, although the shear stress distribution is not well defined. In order to investigate the shear stress distribution and its effects in a friction drive, we have performed the stress analysis of the spherical continuously variable transmission(CVT) using finite element method. The spherical CVT is one of friction drives, which is used in small power applications. The numerical results show that the normal stress distribution is not affected by the transmitted shear force, and the maximal shear stress is increased in small amount along with the shear force.

• Transactions of the Korean Society of Automotive Engineers
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• v.6 no.4
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• pp.121-128
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• 1998

In this study, when tension and bending stress act on plate simultaneously, stress intensity factor is analyzed at crack tip with using BEM(Boundary Element Method). In this analysis, stress intensity factors(S.I.F) are defined for variable ligament, aspect and stress ratio($\sigma$T/$\sigma$B). Consequently, predicted that crack grow to depth direction at low aspect and ligament ratio in tension stress and to surface direction in bending stress. Tension and bending stress act on plate same time, effect of tension stress in the first stage and effect of bending stress in the after stage was to observed. The outbreak of secondary crack in backside is under the control of stress amplitude and predict that the point of outbreak is mear backside.

• Journal of Biosystems Engineering
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• v.35 no.2
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• pp.132-137
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• 2010

Site-specific N application for corn is one of the precision crop management. To implement the site-specific N application, various nitrogen stress sensing methods, including aerial image, tissue analysis, soil sampling analysis, and SPAD meter readings, have been used. Use of side-dressing, an efficient nitrogen application method than a uniform application in either late fall or early spring, relies mainly on the capability of nitrogen deficiency detection. This paper presents map-based variable rate nitrogen application based using a multi-spectral corn nitrogen deficiency(CND) sensor. This sensor assess the nitrogen stress by means of the estimated SPAD reading calculated from the corn leave reflectance. The estimated SPAD value from the CND sensor system and location information form DGPS of each field block was combined into the field map using a ArcView program. Then this map was converted into a raster file for a map-based variable rate application software. The relative SPAD (RSPAD = SPAD over reference SPAD) was investigated 2 weeks after the treatments. The results showed that the map-based variable rate application system was feasible.

• International Journal of Reliability and Applications
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• v.17 no.1
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• pp.85-105
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• 2016

In this paper accelerated life testing is incorporated in quality control technique of acceptance sampling plan to induce early failures in high reliability products.Stress under accelerated condition can be applied in constant-stress, step-stress and progressive-stress or combination of such loadings. A ramp-stress results when stress is increased linearly (from zero) with time. In this paper optimum failure-censored ramp-stress accelerated life test sampling plan for log-logistic distribution has been formulated with cost considerations. The log-logistic distribution has been found appropriate for insulating materials. The optimal plans consist in finding optimum sample size, sample proportion allocated to each stress, and stress rate factor such that producer's and consumer's interests are safeguarded. Variance optimality criterion is used when expected cost per lot is not taken into consideration, and bilevel programming approach is used in cost optimization problems. The methods developed have been illustrated using some numerical examples, and sensitivity analyses carried out in the context of ramp-stress ALTSP based on variable SSP for proportion nonconforming.

• Journal of Korean Home Economics Education Association
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• v.12 no.1
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• pp.33-45
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• 2000

The purpose of this study is to investigate that how much do middle and high school students feel stress and life satisfaction in usual life : how much do stress affect their life satisfaction : and which variables affect their stress and life satisfaction. The samples are 235 middle and high school students in Kangneung, The results of this study are summarized as belows; First. In the case of student’s stress, it is perceived that the degree of school life stress is higher than that of family life stress. And the level of family life satisfaction is higher than that the level of school life satisfaction. Second. the students who perceived a lower level of stress showed the higher life satisfaction. The family life stress is a more influential variable than school life stress to life satisfaction Third, the variables that affect the student’s life satisfaction are sex, the school achievement, the perception on the level of living, communication with the family. the relationship with the teacher and the family life stress. These variables account for about 58.8% of the variance of the student’s life satisfaction.

• Journal of the Korean Society for Precision Engineering
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• v.23 no.5 s.182
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• pp.137-142
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• 2006

The muffler which reduce the exhaust noise and vibration from engine influence on the engine performance. Recently, exhaust variable valve has set up in the muffler controls the backpressure in the exhaust system. And the backpressure variation according to the exhaust variable valve opening has developed the engine performance. First, the preceding of structural analysis is needed and simulation experiment is requested for the study on the design factor to influence on the operation of the exhaust variable valve. In this study, setting up the various variables according to each composition element needed for the structural analysis of the exhaust variable valve, it is experimented the analysis on the influence of each design factor with the calculation of stress distribution and the displacement to cause about the backpressure for the valve through parameter study.

• The Journal of the Korea Contents Association
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• v.18 no.6
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• pp.73-87
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• 2018

The purpose of this study is to investigate the structural relationship among job stress, ego-resilience, social support, and burnout of art therapists. This study verified the relationship and the effect by setting a research model with job stress as independent variable, ego-resilience as mediator variable, social support as control variable, and burnout as dependent variable based on the previous studies. In order to do this study, 300 questionnaires were distributed to art therapists and the 233 questionnaires were used finally for empirical analysis. The results of this study are as follows. First, only career showed significant correlation among personal environmental factors (education, career, treatment time, income per hour, number of supervision). Second, the relationship between job stress and burnout was partially mediated by ego-resilience. Third, social support showed a regulation effect on the relationship between ego-resilience and burnout. Thus, ego-resilience showed a mediation effect in the path that job stress affects burnout, and this mediation effect varies with the level of social support. So the moderated mediation effect was confirmed.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.9 no.5
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• pp.181-192
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• 2014

This study aims to analyze in relation to the influence and variable that their job instability and job stress attribute turnover intention to 134 employees of Midium and Small Firm less than 50 employees of a company being legal management at metropolitan area(Seoul, Kyeonggi-do, Incheon). To analyze a data, I took advantage of SPSS V.21, to analyze correlativity as each variable & causability, utilized bivariate correlation analysis & simple, multiple regression analysis, used sobel test as parameter effectiveness verification and post verification. This research result drew an conclusion to influence to turnover intention and stress perception from employment instability and job role stress of employees of Midium and Small Firm less than 50 employees being legal management, make of effect to the relation to stress perception and turnover intention indirectly. This result suggested the importance of stress management and human resource administration of employee of a Midium and Small Firm being legal management, drew an conclusion to attempt the research at first on employment instability and job stress of employees of Midium and Small Firm being legal management.